Merge pull request #867 from milosgajdos83/rlock-mess

Avoid recursive RLock()

.gitignore

@@ -1,3 +1,7 @@
+# Develop tools
+/.vscode/
+/.idea/
+
 # Binaries for programs and plugins
 *.exe
 *.exe~

.travis.yml

@@ -1,9 +1,11 @@
 language: go
 go:
-- 1.11.x
-- 1.12.x
+- 1.13.x
 env:
-  - GO111MODULE=on
+  - GO111MODULE=on IN_TRAVIS_CI=yes
 notifications:
   slack:
     secure: aEvhLbhujaGaKSrOokiG3//PaVHTIrc3fBpoRbCRqfZpyq6WREoapJJhF+tIpWWOwaC9GmChbD6aHo/jMUgwKXVyPSaNjiEL87YzUUpL8B2zslNp1rgfTg/LrzthOx3Q1TYwpaAl3to0fuHUVFX4yMeC2vuThq7WSXgMMxFCtbc=
+cache:
+  directories:
+    - $GOPATH/pkg/mod

README.zh-cn.md

@@ -32,5 +32,5 @@ Go Micro把分布式系统的各种细节抽象出来。下面是它的主要特
 
 ## 快速上手
 
-更多关于架构、安装的资料可以查看[文档](https://micro.mu/docs/go-micro_cn.html)。
+更多关于架构、安装的资料可以查看[文档](https://micro.mu/docs/cn/)。
 

api/server/acme/acme.go

@@ -0,0 +1,24 @@
+// Package acme abstracts away various ACME libraries
+package acme
+
+import (
+	"errors"
+	"net"
+)
+
+var (
+	// ErrProviderNotImplemented can be returned when attempting to
+	// instantiate an unimplemented provider
+	ErrProviderNotImplemented = errors.New("Provider not implemented")
+)
+
+// Provider is a ACME provider interface
+type Provider interface {
+	NewListener(...string) (net.Listener, error)
+}
+
+// The Let's Encrypt ACME endpoints
+const (
+	LetsEncryptStagingCA    = "https://acme-staging-v02.api.letsencrypt.org/directory"
+	LetsEncryptProductionCA = "https://acme-v02.api.letsencrypt.org/directory"
+)

api/server/acme/autocert/autocert.go

@@ -0,0 +1,23 @@
+// Package autocert is the ACME provider from golang.org/x/crypto/acme/autocert
+// This provider does not take any config.
+package autocert
+
+import (
+	"net"
+
+	"github.com/micro/go-micro/api/server/acme"
+	"golang.org/x/crypto/acme/autocert"
+)
+
+// autoCertACME is the ACME provider from golang.org/x/crypto/acme/autocert
+type autocertProvider struct{}
+
+// NewListener implements acme.Provider
+func (a *autocertProvider) NewListener(ACMEHosts ...string) (net.Listener, error) {
+	return autocert.NewListener(ACMEHosts...), nil
+}
+
+// New returns an autocert acme.Provider
+func New() acme.Provider {
+	return &autocertProvider{}
+}

api/server/acme/autocert/autocert_test.go

@@ -0,0 +1,16 @@
+package autocert
+
+import (
+	"testing"
+)
+
+func TestAutocert(t *testing.T) {
+	l := New()
+	if _, ok := l.(*autocertProvider); !ok {
+		t.Error("New() didn't return an autocertProvider")
+	}
+	// TODO: Travis CI doesn't let us bind :443
+	// if _, err := l.NewListener(); err != nil {
+	// 	t.Error(err.Error())
+	// }
+}

api/server/acme/certmagic/certmagic.go

@@ -0,0 +1,62 @@
+// Package certmagic is the ACME provider from github.com/mholt/certmagic
+package certmagic
+
+import (
+	"log"
+	"math/rand"
+	"net"
+	"time"
+
+	"github.com/mholt/certmagic"
+
+	"github.com/micro/go-micro/api/server/acme"
+)
+
+type certmagicProvider struct {
+	opts *acme.Options
+}
+
+func (c *certmagicProvider) NewListener(ACMEHosts ...string) (net.Listener, error) {
+	certmagic.Default.CA = c.opts.CA
+	if c.opts.ChallengeProvider != nil {
+		// Enabling DNS Challenge disables the other challenges
+		certmagic.Default.DNSProvider = c.opts.ChallengeProvider
+	}
+	if c.opts.OnDemand {
+		certmagic.Default.OnDemand = new(certmagic.OnDemandConfig)
+	}
+	if c.opts.Cache != nil {
+		// already validated by new()
+		certmagic.Default.Storage = c.opts.Cache.(certmagic.Storage)
+	}
+	// If multiple instances of the provider are running, inject some
+	// randomness so they don't collide
+	rand.Seed(time.Now().UnixNano())
+	randomDuration := (7 * 24 * time.Hour) + (time.Duration(rand.Intn(504)) * time.Hour)
+	certmagic.Default.RenewDurationBefore = randomDuration
+
+	return certmagic.Listen(ACMEHosts)
+}
+
+// New returns a certmagic provider
+func New(options ...acme.Option) acme.Provider {
+	o := &acme.Options{}
+	if len(options) == 0 {
+		for _, op := range acme.Default() {
+			op(o)
+		}
+	} else {
+		for _, op := range options {
+			op(o)
+		}
+	}
+	if o.Cache != nil {
+		if _, ok := o.Cache.(certmagic.Storage); !ok {
+			log.Fatal("ACME: cache provided doesn't implement certmagic's Storage interface")
+		}
+	}
+
+	return &certmagicProvider{
+		opts: o,
+	}
+}

api/server/acme/certmagic/certmagic_test.go

@@ -0,0 +1,231 @@
+package certmagic
+
+import (
+	"net/http"
+	"os"
+	"reflect"
+	"sort"
+	"testing"
+	"time"
+
+	"github.com/go-acme/lego/v3/providers/dns/cloudflare"
+	"github.com/mholt/certmagic"
+	"github.com/micro/go-micro/api/server/acme"
+	"github.com/micro/go-micro/config/options"
+	cloudflarestorage "github.com/micro/go-micro/store/cloudflare"
+	"github.com/micro/go-micro/sync/lock/memory"
+)
+
+func TestCertMagic(t *testing.T) {
+	if len(os.Getenv("IN_TRAVIS_CI")) != 0 {
+		t.Skip("Travis doesn't let us bind :443")
+	}
+	l, err := New().NewListener()
+	if err != nil {
+		t.Error(err.Error())
+	}
+	l.Close()
+
+	c := cloudflare.NewDefaultConfig()
+	c.AuthEmail = ""
+	c.AuthKey = ""
+	c.AuthToken = "test"
+	c.ZoneToken = "test"
+
+	p, err := cloudflare.NewDNSProviderConfig(c)
+	if err != nil {
+		t.Error(err.Error())
+	}
+
+	l, err = New(acme.AcceptToS(true),
+		acme.CA(acme.LetsEncryptStagingCA),
+		acme.ChallengeProvider(p),
+	).NewListener()
+
+	if err != nil {
+		t.Error(err.Error())
+	}
+	l.Close()
+}
+
+func TestStorageImplementation(t *testing.T) {
+	apiToken, accountID := os.Getenv("CF_API_TOKEN"), os.Getenv("CF_ACCOUNT_ID")
+	kvID := os.Getenv("KV_NAMESPACE_ID")
+	if len(apiToken) == 0 || len(accountID) == 0 || len(kvID) == 0 {
+		t.Skip("No Cloudflare API keys available, skipping test")
+	}
+
+	var s certmagic.Storage
+	st, err := cloudflarestorage.New(
+		options.WithValue("CF_API_TOKEN", apiToken),
+		options.WithValue("CF_ACCOUNT_ID", accountID),
+		options.WithValue("KV_NAMESPACE_ID", kvID),
+	)
+	if err != nil {
+		t.Fatalf("Couldn't initialise cloudflare storage: %s\n", err.Error())
+	}
+	s = &storage{
+		lock:  memory.NewLock(),
+		store: st,
+	}
+
+	// Test Lock
+	if err := s.Lock("test"); err != nil {
+		t.Error(err)
+	}
+
+	// Test Unlock
+	if err := s.Unlock("test"); err != nil {
+		t.Error(err)
+	}
+
+	// Test data
+	testdata := []struct {
+		key   string
+		value []byte
+	}{
+		{key: "/foo/a", value: []byte("lorem")},
+		{key: "/foo/b", value: []byte("ipsum")},
+		{key: "/foo/c", value: []byte("dolor")},
+		{key: "/foo/d", value: []byte("sit")},
+		{key: "/bar/a", value: []byte("amet")},
+		{key: "/bar/b", value: []byte("consectetur")},
+		{key: "/bar/c", value: []byte("adipiscing")},
+		{key: "/bar/d", value: []byte("elit")},
+		{key: "/foo/bar/a", value: []byte("sed")},
+		{key: "/foo/bar/b", value: []byte("do")},
+		{key: "/foo/bar/c", value: []byte("eiusmod")},
+		{key: "/foo/bar/d", value: []byte("tempor")},
+		{key: "/foo/bar/baz/a", value: []byte("incididunt")},
+		{key: "/foo/bar/baz/b", value: []byte("ut")},
+		{key: "/foo/bar/baz/c", value: []byte("labore")},
+		{key: "/foo/bar/baz/d", value: []byte("et")},
+		// a duplicate just in case there's any edge cases
+		{key: "/foo/a", value: []byte("lorem")},
+	}
+
+	// Test Store
+	for _, d := range testdata {
+		if err := s.Store(d.key, d.value); err != nil {
+			t.Error(err.Error())
+		}
+	}
+
+	// Test Load
+	for _, d := range testdata {
+		if value, err := s.Load(d.key); err != nil {
+			t.Error(err.Error())
+		} else {
+			if !reflect.DeepEqual(value, d.value) {
+				t.Errorf("Load %s: expected %v, got %v", d.key, d.value, value)
+			}
+		}
+	}
+
+	// Test Exists
+	for _, d := range testdata {
+		if !s.Exists(d.key) {
+			t.Errorf("%s should exist, but doesn't\n", d.key)
+		}
+	}
+
+	// Test List
+	if list, err := s.List("/", true); err != nil {
+		t.Error(err.Error())
+	} else {
+		var expected []string
+		for i, d := range testdata {
+			if i != len(testdata)-1 {
+				// Don't store the intentionally duplicated key
+				expected = append(expected, d.key)
+			}
+		}
+		sort.Strings(expected)
+		sort.Strings(list)
+		if !reflect.DeepEqual(expected, list) {
+			t.Errorf("List: Expected %v, got %v\n", expected, list)
+		}
+	}
+	if list, err := s.List("/foo", false); err != nil {
+		t.Error(err.Error())
+	} else {
+		sort.Strings(list)
+		expected := []string{"/foo/a", "/foo/b", "/foo/bar", "/foo/c", "/foo/d"}
+		if !reflect.DeepEqual(expected, list) {
+			t.Errorf("List: expected %s, got %s\n", expected, list)
+		}
+	}
+
+	// Test Stat
+	for _, d := range testdata {
+		info, err := s.Stat(d.key)
+		if err != nil {
+			t.Error(err.Error())
+		} else {
+			if info.Key != d.key {
+				t.Errorf("Stat().Key: expected %s, got %s\n", d.key, info.Key)
+			}
+			if info.Size != int64(len(d.value)) {
+				t.Errorf("Stat().Size: expected %d, got %d\n", len(d.value), info.Size)
+			}
+			if time.Since(info.Modified) > time.Minute {
+				t.Errorf("Stat().Modified: expected time since last modified to be < 1 minute, got %v\n", time.Since(info.Modified))
+			}
+		}
+
+	}
+
+	// Test Delete
+	for _, d := range testdata {
+		if err := s.Delete(d.key); err != nil {
+			t.Error(err.Error())
+		}
+	}
+
+	// New interface doesn't return an error, so call it in case any log.Fatal
+	// happens
+	New(acme.Cache(s))
+}
+
+// Full test with a real zone, with  against LE staging
+func TestE2e(t *testing.T) {
+	apiToken, accountID := os.Getenv("CF_API_TOKEN"), os.Getenv("CF_ACCOUNT_ID")
+	kvID := os.Getenv("KV_NAMESPACE_ID")
+	if len(apiToken) == 0 || len(accountID) == 0 || len(kvID) == 0 {
+		t.Skip("No Cloudflare API keys available, skipping test")
+	}
+
+	testLock := memory.NewLock()
+	testStore, err := cloudflarestorage.New(
+		options.WithValue("CF_API_TOKEN", apiToken),
+		options.WithValue("CF_ACCOUNT_ID", accountID),
+		options.WithValue("KV_NAMESPACE_ID", kvID),
+	)
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+	testStorage := NewStorage(testLock, testStore)
+
+	conf := cloudflare.NewDefaultConfig()
+	conf.AuthToken = apiToken
+	conf.ZoneToken = apiToken
+	testChallengeProvider, err := cloudflare.NewDNSProviderConfig(conf)
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	testProvider := New(
+		acme.AcceptToS(true),
+		acme.Cache(testStorage),
+		acme.CA(acme.LetsEncryptStagingCA),
+		acme.ChallengeProvider(testChallengeProvider),
+		acme.OnDemand(false),
+	)
+
+	listener, err := testProvider.NewListener("*.micro.mu", "micro.mu")
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+	go http.Serve(listener, http.NotFoundHandler())
+	time.Sleep(10 * time.Minute)
+}

api/server/acme/certmagic/storage.go

@@ -0,0 +1,146 @@
+package certmagic
+
+import (
+	"bytes"
+	"encoding/gob"
+	"errors"
+	"fmt"
+	"path"
+	"strings"
+	"time"
+
+	"github.com/mholt/certmagic"
+	"github.com/micro/go-micro/store"
+	"github.com/micro/go-micro/sync/lock"
+)
+
+// File represents a "File" that will be stored in store.Store - the contents and last modified time
+type File struct {
+	// last modified time
+	LastModified time.Time
+	// Contents
+	Contents []byte
+}
+
+// storage is an implementation of certmagic.Storage using micro's sync.Map and store.Store interfaces.
+// As certmagic storage expects a filesystem (with stat() abilities) we have to implement
+// the bare minimum of metadata.
+type storage struct {
+	lock  lock.Lock
+	store store.Store
+}
+
+func (s *storage) Lock(key string) error {
+	return s.lock.Acquire(key, lock.TTL(10*time.Minute))
+}
+
+func (s *storage) Unlock(key string) error {
+	return s.lock.Release(key)
+}
+
+func (s *storage) Store(key string, value []byte) error {
+	f := File{
+		LastModified: time.Now(),
+		Contents:     value,
+	}
+	buf := &bytes.Buffer{}
+	e := gob.NewEncoder(buf)
+	if err := e.Encode(f); err != nil {
+		return err
+	}
+	r := &store.Record{
+		Key:   key,
+		Value: buf.Bytes(),
+	}
+	return s.store.Write(r)
+}
+
+func (s *storage) Load(key string) ([]byte, error) {
+	if !s.Exists(key) {
+		return nil, certmagic.ErrNotExist(errors.New(key + " doesn't exist"))
+	}
+	records, err := s.store.Read(key)
+	if err != nil {
+		return nil, err
+	}
+	if len(records) != 1 {
+		return nil, fmt.Errorf("ACME Storage: multiple records matched key %s", key)
+	}
+	b := bytes.NewBuffer(records[0].Value)
+	d := gob.NewDecoder(b)
+	var f File
+	err = d.Decode(&f)
+	if err != nil {
+		return nil, err
+	}
+	return f.Contents, nil
+}
+
+func (s *storage) Delete(key string) error {
+	return s.store.Delete(key)
+}
+
+func (s *storage) Exists(key string) bool {
+	_, err := s.store.Read(key)
+	if err != nil {
+		return false
+	}
+	return true
+}
+
+func (s *storage) List(prefix string, recursive bool) ([]string, error) {
+	records, err := s.store.Sync()
+	if err != nil {
+		return nil, err
+	}
+	var results []string
+	for _, r := range records {
+		if strings.HasPrefix(r.Key, prefix) {
+			results = append(results, r.Key)
+		}
+	}
+	if recursive {
+		return results, nil
+	}
+	keysMap := make(map[string]bool)
+	for _, key := range results {
+		dir := strings.Split(strings.TrimPrefix(key, prefix+"/"), "/")
+		keysMap[dir[0]] = true
+	}
+	results = make([]string, 0)
+	for k := range keysMap {
+		results = append(results, path.Join(prefix, k))
+	}
+	return results, nil
+}
+
+func (s *storage) Stat(key string) (certmagic.KeyInfo, error) {
+	records, err := s.store.Read(key)
+	if err != nil {
+		return certmagic.KeyInfo{}, err
+	}
+	if len(records) != 1 {
+		return certmagic.KeyInfo{}, fmt.Errorf("ACME Storage: multiple records matched key %s", key)
+	}
+	b := bytes.NewBuffer(records[0].Value)
+	d := gob.NewDecoder(b)
+	var f File
+	err = d.Decode(&f)
+	if err != nil {
+		return certmagic.KeyInfo{}, err
+	}
+	return certmagic.KeyInfo{
+		Key:        key,
+		Modified:   f.LastModified,
+		Size:       int64(len(f.Contents)),
+		IsTerminal: false,
+	}, nil
+}
+
+// NewStorage returns a certmagic.Storage backed by a go-micro/lock and go-micro/store
+func NewStorage(lock lock.Lock, store store.Store) certmagic.Storage {
+	return &storage{
+		lock:  lock,
+		store: store,
+	}
+}

api/server/acme/options.go

@@ -0,0 +1,73 @@
+package acme
+
+import "github.com/go-acme/lego/v3/challenge"
+
+// Option (or Options) are passed to New() to configure providers
+type Option func(o *Options)
+
+// Options represents various options you can present to ACME providers
+type Options struct {
+	// AcceptTLS must be set to true to indicate that you have read your
+	// provider's terms of service.
+	AcceptToS bool
+	// CA is the CA to use
+	CA string
+	// ChallengeProvider is a go-acme/lego challenge provider. Set this if you
+	// want to use DNS Challenges. Otherwise, tls-alpn-01 will be used
+	ChallengeProvider challenge.Provider
+	// Issue certificates for domains on demand. Otherwise, certs will be
+	// retrieved / issued on start-up.
+	OnDemand bool
+	// Cache is a storage interface. Most ACME libraries have an cache, but
+	// there's no defined interface, so if you consume this option
+	// sanity check it before using.
+	Cache interface{}
+}
+
+// AcceptToS indicates whether you accept your CA's terms of service
+func AcceptToS(b bool) Option {
+	return func(o *Options) {
+		o.AcceptToS = b
+	}
+}
+
+// CA sets the CA of an acme.Options
+func CA(CA string) Option {
+	return func(o *Options) {
+		o.CA = CA
+	}
+}
+
+// ChallengeProvider sets the Challenge provider of an acme.Options
+// if set, it enables the DNS challenge, otherwise tls-alpn-01 will be used.
+func ChallengeProvider(p challenge.Provider) Option {
+	return func(o *Options) {
+		o.ChallengeProvider = p
+	}
+}
+
+// OnDemand enables on-demand certificate issuance. Not recommended for use
+// with the DNS challenge, as the first connection may be very slow.
+func OnDemand(b bool) Option {
+	return func(o *Options) {
+		o.OnDemand = b
+	}
+}
+
+// Cache provides a cache / storage interface to the underlying ACME library
+// as there is no standard, this needs to be validated by the underlying
+// implentation.
+func Cache(c interface{}) Option {
+	return func(o *Options) {
+		o.Cache = c
+	}
+}
+
+// Default uses the Let's Encrypt Production CA, with DNS Challenge disabled.
+func Default() []Option {
+	return []Option{
+		AcceptToS(true),
+		CA(LetsEncryptProductionCA),
+		OnDemand(true),
+	}
+}

api/server/http/http.go

@@ -11,7 +11,6 @@ import (
 	"github.com/gorilla/handlers"
 	"github.com/micro/go-micro/api/server"
 	"github.com/micro/go-micro/util/log"
-	"golang.org/x/crypto/acme/autocert"
 )
 
 type httpServer struct {
@@ -53,9 +52,9 @@ func (s *httpServer) Start() error {
 	var l net.Listener
 	var err error
 
-	if s.opts.EnableACME {
+	if s.opts.EnableACME && s.opts.ACMEProvider != nil {
 		// should we check the address to make sure its using :443?
-		l = autocert.NewListener(s.opts.ACMEHosts...)
+		l, err = s.opts.ACMEProvider.NewListener(s.opts.ACMEHosts...)
 	} else if s.opts.EnableTLS && s.opts.TLSConfig != nil {
 		l, err = tls.Listen("tcp", s.address, s.opts.TLSConfig)
 	} else {

api/server/options.go

@@ -2,15 +2,24 @@ package server
 
 import (
 	"crypto/tls"
+
+	"github.com/micro/go-micro/api/server/acme"
 )
 
 type Option func(o *Options)
 
 type Options struct {
-	EnableACME bool
-	EnableTLS  bool
-	ACMEHosts  []string
-	TLSConfig  *tls.Config
+	EnableACME   bool
+	ACMEProvider acme.Provider
+	EnableTLS    bool
+	ACMEHosts    []string
+	TLSConfig    *tls.Config
+}
+
+func EnableACME(b bool) Option {
+	return func(o *Options) {
+		o.EnableACME = b
+	}
 }
 
 func ACMEHosts(hosts ...string) Option {
@@ -19,9 +28,9 @@ func ACMEHosts(hosts ...string) Option {
 	}
 }
 
-func EnableACME(b bool) Option {
+func ACMEProvider(p acme.Provider) Option {
 	return func(o *Options) {
-		o.EnableACME = b
+		o.ACMEProvider = p
 	}
 }
 

broker/http_broker.go

@@ -324,15 +324,21 @@ func (h *httpBroker) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 	p := &httpEvent{m: m, t: topic}
 	id := req.Form.Get("id")
 
+	var subs []Handler
+
 	h.RLock()
 	for _, subscriber := range h.subscribers[topic] {
-		if id == subscriber.id {
-			// sub is sync; crufty rate limiting
-			// so we don't hose the cpu
-			subscriber.fn(p)
+		if id != subscriber.id {
+			continue
 		}
+		subs = append(subs, subscriber.fn)
 	}
 	h.RUnlock()
+
+	// execute the handler
+	for _, fn := range subs {
+		fn(p)
+	}
 }
 
 func (h *httpBroker) Address() string {
@@ -420,7 +426,6 @@ func (h *httpBroker) Connect() error {
 }
 
 func (h *httpBroker) Disconnect() error {
-
 	h.RLock()
 	if !h.running {
 		h.RUnlock()
@@ -522,7 +527,7 @@ func (h *httpBroker) Publish(topic string, msg *Message, opts ...PublishOption)
 
 	// now attempt to get the service
 	h.RLock()
-	s, err := h.r.GetService("topic:" + topic)
+	s, err := h.r.GetService(topic)
 	if err != nil {
 		h.RUnlock()
 		// ignore error
@@ -560,13 +565,29 @@ func (h *httpBroker) Publish(topic string, msg *Message, opts ...PublishOption)
 				continue
 			}
 
+			var nodes []*registry.Node
+
+			for _, node := range service.Nodes {
+				// only use nodes tagged with broker http
+				if node.Metadata["broker"] != "http" {
+					continue
+				}
+
+				// look for nodes for the topic
+				if node.Metadata["topic"] != topic {
+					continue
+				}
+
+				nodes = append(nodes, node)
+			}
+
 			switch service.Version {
 			// broadcast version means broadcast to all nodes
 			case broadcastVersion:
 				var success bool
 
 				// publish to all nodes
-				for _, node := range service.Nodes {
+				for _, node := range nodes {
 					// publish async
 					if err := pub(node, topic, b); err == nil {
 						success = true
@@ -579,7 +600,7 @@ func (h *httpBroker) Publish(topic string, msg *Message, opts ...PublishOption)
 				}
 			default:
 				// select node to publish to
-				node := service.Nodes[rand.Int()%len(service.Nodes)]
+				node := nodes[rand.Int()%len(nodes)]
 
 				// publish async to one node
 				if err := pub(node, topic, b); err != nil {
@@ -642,6 +663,8 @@ func (h *httpBroker) Subscribe(topic string, handler Handler, opts ...SubscribeO
 		Address: mnet.HostPort(addr, port),
 		Metadata: map[string]string{
 			"secure": fmt.Sprintf("%t", secure),
+			"broker": "http",
+			"topic":  topic,
 		},
 	}
 
@@ -652,7 +675,7 @@ func (h *httpBroker) Subscribe(topic string, handler Handler, opts ...SubscribeO
 	}
 
 	service := &registry.Service{
-		Name:    "topic:" + topic,
+		Name:    topic,
 		Version: version,
 		Nodes:   []*registry.Node{node},
 	}

broker/nats/nats.go

@@ -13,18 +13,19 @@ import (
 )
 
 type natsBroker struct {
+	sync.Once
 	sync.RWMutex
-	addrs []string
-	conn  *nats.Conn
-	opts  broker.Options
-	nopts nats.Options
-	drain bool
+	addrs   []string
+	conn    *nats.Conn
+	opts    broker.Options
+	nopts   nats.Options
+	drain   bool
+	closeCh chan (error)
 }
 
 type subscriber struct {
-	s     *nats.Subscription
-	opts  broker.SubscribeOptions
-	drain bool
+	s    *nats.Subscription
+	opts broker.SubscribeOptions
 }
 
 type publication struct {
@@ -54,9 +55,6 @@ func (s *subscriber) Topic() string {
 }
 
 func (s *subscriber) Unsubscribe() error {
-	if s.drain {
-		return s.s.Drain()
-	}
 	return s.s.Unsubscribe()
 }
 
@@ -122,20 +120,17 @@ func (n *natsBroker) Connect() error {
 
 func (n *natsBroker) Disconnect() error {
 	n.RLock()
+	defer n.RUnlock()
 	if n.drain {
 		n.conn.Drain()
-	} else {
-		n.conn.Close()
+		return <-n.closeCh
 	}
-	n.RUnlock()
+	n.conn.Close()
 	return nil
 }
 
 func (n *natsBroker) Init(opts ...broker.Option) error {
-	for _, o := range opts {
-		o(&n.opts)
-	}
-	n.addrs = setAddrs(n.opts.Addrs)
+	n.setOption(opts...)
 	return nil
 }
 
@@ -167,11 +162,6 @@ func (n *natsBroker) Subscribe(topic string, handler broker.Handler, opts ...bro
 		o(&opt)
 	}
 
-	var drain bool
-	if _, ok := opt.Context.Value(drainSubscriptionKey{}).(bool); ok {
-		drain = true
-	}
-
 	fn := func(msg *nats.Msg) {
 		var m broker.Message
 		if err := n.opts.Codec.Unmarshal(msg.Data, &m); err != nil {
@@ -193,7 +183,7 @@ func (n *natsBroker) Subscribe(topic string, handler broker.Handler, opts ...bro
 	if err != nil {
 		return nil, err
 	}
-	return &subscriber{s: sub, opts: opt, drain: drain}, nil
+	return &subscriber{s: sub, opts: opt}, nil
 }
 
 func (n *natsBroker) String() string {
@@ -207,39 +197,59 @@ func NewBroker(opts ...broker.Option) broker.Broker {
 		Context: context.Background(),
 	}
 
+	n := &natsBroker{
+		opts: options,
+	}
+	n.setOption(opts...)
+
+	return n
+}
+
+func (n *natsBroker) setOption(opts ...broker.Option) {
 	for _, o := range opts {
-		o(&options)
+		o(&n.opts)
 	}
 
-	natsOpts := nats.GetDefaultOptions()
-	if n, ok := options.Context.Value(optionsKey{}).(nats.Options); ok {
-		natsOpts = n
-	}
+	n.Once.Do(func() {
+		n.nopts = nats.GetDefaultOptions()
+	})
 
-	var drain bool
-	if _, ok := options.Context.Value(drainSubscriptionKey{}).(bool); ok {
-		drain = true
+	if nopts, ok := n.opts.Context.Value(optionsKey{}).(nats.Options); ok {
+		n.nopts = nopts
 	}
 
 	// broker.Options have higher priority than nats.Options
 	// only if Addrs, Secure or TLSConfig were not set through a broker.Option
 	// we read them from nats.Option
-	if len(options.Addrs) == 0 {
-		options.Addrs = natsOpts.Servers
+	if len(n.opts.Addrs) == 0 {
+		n.opts.Addrs = n.nopts.Servers
 	}
 
-	if !options.Secure {
-		options.Secure = natsOpts.Secure
+	if !n.opts.Secure {
+		n.opts.Secure = n.nopts.Secure
 	}
 
-	if options.TLSConfig == nil {
-		options.TLSConfig = natsOpts.TLSConfig
+	if n.opts.TLSConfig == nil {
+		n.opts.TLSConfig = n.nopts.TLSConfig
 	}
+	n.addrs = setAddrs(n.opts.Addrs)
 
-	return &natsBroker{
-		opts:  options,
-		nopts: natsOpts,
-		addrs: setAddrs(options.Addrs),
-		drain: drain,
+	if n.opts.Context.Value(drainConnectionKey{}) != nil {
+		n.drain = true
+		n.closeCh = make(chan error)
+		n.nopts.ClosedCB = n.onClose
+		n.nopts.AsyncErrorCB = n.onAsyncError
+	}
+}
+
+func (n *natsBroker) onClose(conn *nats.Conn) {
+	n.closeCh <- nil
+}
+
+func (n *natsBroker) onAsyncError(conn *nats.Conn, sub *nats.Subscription, err error) {
+	// There are kinds of different async error nats might callback, but we are interested
+	// in ErrDrainTimeout only here.
+	if err == nats.ErrDrainTimeout {
+		n.closeCh <- err
 	}
 }

broker/nats/options.go

@@ -7,7 +7,6 @@ import (
 
 type optionsKey struct{}
 type drainConnectionKey struct{}
-type drainSubscriptionKey struct{}
 
 // Options accepts nats.Options
 func Options(opts nats.Options) broker.Option {
@@ -16,10 +15,5 @@ func Options(opts nats.Options) broker.Option {
 
 // DrainConnection will drain subscription on close
 func DrainConnection() broker.Option {
-	return setBrokerOption(drainConnectionKey{}, true)
-}
-
-// DrainSubscription will drain pending messages when unsubscribe
-func DrainSubscription() broker.SubscribeOption {
-	return setSubscribeOption(drainSubscriptionKey{}, true)
+	return setBrokerOption(drainConnectionKey{}, struct{}{})
 }

broker/service/handler/handler.go

@@ -0,0 +1,66 @@
+package handler
+
+import (
+	"context"
+
+	"github.com/micro/go-micro/broker"
+	pb "github.com/micro/go-micro/broker/service/proto"
+	"github.com/micro/go-micro/errors"
+	"github.com/micro/go-micro/util/log"
+)
+
+type Broker struct {
+	Broker broker.Broker
+}
+
+func (b *Broker) Publish(ctx context.Context, req *pb.PublishRequest, rsp *pb.Empty) error {
+	log.Debugf("Publishing message to %s topic", req.Topic)
+	err := b.Broker.Publish(req.Topic, &broker.Message{
+		Header: req.Message.Header,
+		Body:   req.Message.Body,
+	})
+	log.Debugf("Published message to %s topic", req.Topic)
+	if err != nil {
+		return errors.InternalServerError("go.micro.broker", err.Error())
+	}
+	return nil
+}
+
+func (b *Broker) Subscribe(ctx context.Context, req *pb.SubscribeRequest, stream pb.Broker_SubscribeStream) error {
+	errChan := make(chan error, 1)
+
+	// message handler to stream back messages from broker
+	handler := func(p broker.Event) error {
+		if err := stream.Send(&pb.Message{
+			Header: p.Message().Header,
+			Body:   p.Message().Body,
+		}); err != nil {
+			select {
+			case errChan <- err:
+				return err
+			default:
+				return err
+			}
+		}
+		return nil
+	}
+
+	log.Debugf("Subscribing to %s topic", req.Topic)
+	sub, err := b.Broker.Subscribe(req.Topic, handler, broker.Queue(req.Queue))
+	if err != nil {
+		return errors.InternalServerError("go.micro.broker", err.Error())
+	}
+	defer func() {
+		log.Debugf("Unsubscribing from topic %s", req.Topic)
+		sub.Unsubscribe()
+	}()
+
+	select {
+	case <-ctx.Done():
+		log.Debugf("Context done for subscription to topic %s", req.Topic)
+		return nil
+	case err := <-errChan:
+		log.Debugf("Subscription error for topic %s: %v", req.Topic, err)
+		return err
+	}
+}

broker/service/proto/broker.micro.go

@@ -0,0 +1,173 @@
+// Code generated by protoc-gen-micro. DO NOT EDIT.
+// source: github.com/micro/go-micro/broker/proto/broker.proto
+
+package go_micro_broker
+
+import (
+	fmt "fmt"
+	proto "github.com/golang/protobuf/proto"
+	math "math"
+)
+
+import (
+	context "context"
+	client "github.com/micro/go-micro/client"
+	server "github.com/micro/go-micro/server"
+)
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ = proto.Marshal
+var _ = fmt.Errorf
+var _ = math.Inf
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the proto package it is being compiled against.
+// A compilation error at this line likely means your copy of the
+// proto package needs to be updated.
+const _ = proto.ProtoPackageIsVersion3 // please upgrade the proto package
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ context.Context
+var _ client.Option
+var _ server.Option
+
+// Client API for Broker service
+
+type BrokerService interface {
+	Publish(ctx context.Context, in *PublishRequest, opts ...client.CallOption) (*Empty, error)
+	Subscribe(ctx context.Context, in *SubscribeRequest, opts ...client.CallOption) (Broker_SubscribeService, error)
+}
+
+type brokerService struct {
+	c    client.Client
+	name string
+}
+
+func NewBrokerService(name string, c client.Client) BrokerService {
+	if c == nil {
+		c = client.NewClient()
+	}
+	if len(name) == 0 {
+		name = "go.micro.broker"
+	}
+	return &brokerService{
+		c:    c,
+		name: name,
+	}
+}
+
+func (c *brokerService) Publish(ctx context.Context, in *PublishRequest, opts ...client.CallOption) (*Empty, error) {
+	req := c.c.NewRequest(c.name, "Broker.Publish", in)
+	out := new(Empty)
+	err := c.c.Call(ctx, req, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *brokerService) Subscribe(ctx context.Context, in *SubscribeRequest, opts ...client.CallOption) (Broker_SubscribeService, error) {
+	req := c.c.NewRequest(c.name, "Broker.Subscribe", &SubscribeRequest{})
+	stream, err := c.c.Stream(ctx, req, opts...)
+	if err != nil {
+		return nil, err
+	}
+	if err := stream.Send(in); err != nil {
+		return nil, err
+	}
+	return &brokerServiceSubscribe{stream}, nil
+}
+
+type Broker_SubscribeService interface {
+	SendMsg(interface{}) error
+	RecvMsg(interface{}) error
+	Close() error
+	Recv() (*Message, error)
+}
+
+type brokerServiceSubscribe struct {
+	stream client.Stream
+}
+
+func (x *brokerServiceSubscribe) Close() error {
+	return x.stream.Close()
+}
+
+func (x *brokerServiceSubscribe) SendMsg(m interface{}) error {
+	return x.stream.Send(m)
+}
+
+func (x *brokerServiceSubscribe) RecvMsg(m interface{}) error {
+	return x.stream.Recv(m)
+}
+
+func (x *brokerServiceSubscribe) Recv() (*Message, error) {
+	m := new(Message)
+	err := x.stream.Recv(m)
+	if err != nil {
+		return nil, err
+	}
+	return m, nil
+}
+
+// Server API for Broker service
+
+type BrokerHandler interface {
+	Publish(context.Context, *PublishRequest, *Empty) error
+	Subscribe(context.Context, *SubscribeRequest, Broker_SubscribeStream) error
+}
+
+func RegisterBrokerHandler(s server.Server, hdlr BrokerHandler, opts ...server.HandlerOption) error {
+	type broker interface {
+		Publish(ctx context.Context, in *PublishRequest, out *Empty) error
+		Subscribe(ctx context.Context, stream server.Stream) error
+	}
+	type Broker struct {
+		broker
+	}
+	h := &brokerHandler{hdlr}
+	return s.Handle(s.NewHandler(&Broker{h}, opts...))
+}
+
+type brokerHandler struct {
+	BrokerHandler
+}
+
+func (h *brokerHandler) Publish(ctx context.Context, in *PublishRequest, out *Empty) error {
+	return h.BrokerHandler.Publish(ctx, in, out)
+}
+
+func (h *brokerHandler) Subscribe(ctx context.Context, stream server.Stream) error {
+	m := new(SubscribeRequest)
+	if err := stream.Recv(m); err != nil {
+		return err
+	}
+	return h.BrokerHandler.Subscribe(ctx, m, &brokerSubscribeStream{stream})
+}
+
+type Broker_SubscribeStream interface {
+	SendMsg(interface{}) error
+	RecvMsg(interface{}) error
+	Close() error
+	Send(*Message) error
+}
+
+type brokerSubscribeStream struct {
+	stream server.Stream
+}
+
+func (x *brokerSubscribeStream) Close() error {
+	return x.stream.Close()
+}
+
+func (x *brokerSubscribeStream) SendMsg(m interface{}) error {
+	return x.stream.Send(m)
+}
+
+func (x *brokerSubscribeStream) RecvMsg(m interface{}) error {
+	return x.stream.Recv(m)
+}
+
+func (x *brokerSubscribeStream) Send(m *Message) error {
+	return x.stream.Send(m)
+}

broker/service/proto/broker.pb.go

@@ -0,0 +1,364 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// source: github.com/micro/go-micro/broker/proto/broker.proto
+
+package go_micro_broker
+
+import (
+	context "context"
+	fmt "fmt"
+	proto "github.com/golang/protobuf/proto"
+	grpc "google.golang.org/grpc"
+	math "math"
+)
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ = proto.Marshal
+var _ = fmt.Errorf
+var _ = math.Inf
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the proto package it is being compiled against.
+// A compilation error at this line likely means your copy of the
+// proto package needs to be updated.
+const _ = proto.ProtoPackageIsVersion3 // please upgrade the proto package
+
+type Empty struct {
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *Empty) Reset()         { *m = Empty{} }
+func (m *Empty) String() string { return proto.CompactTextString(m) }
+func (*Empty) ProtoMessage()    {}
+func (*Empty) Descriptor() ([]byte, []int) {
+	return fileDescriptor_5edf81766900dd99, []int{0}
+}
+
+func (m *Empty) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_Empty.Unmarshal(m, b)
+}
+func (m *Empty) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_Empty.Marshal(b, m, deterministic)
+}
+func (m *Empty) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_Empty.Merge(m, src)
+}
+func (m *Empty) XXX_Size() int {
+	return xxx_messageInfo_Empty.Size(m)
+}
+func (m *Empty) XXX_DiscardUnknown() {
+	xxx_messageInfo_Empty.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_Empty proto.InternalMessageInfo
+
+type PublishRequest struct {
+	Topic                string   `protobuf:"bytes,1,opt,name=topic,proto3" json:"topic,omitempty"`
+	Message              *Message `protobuf:"bytes,2,opt,name=message,proto3" json:"message,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *PublishRequest) Reset()         { *m = PublishRequest{} }
+func (m *PublishRequest) String() string { return proto.CompactTextString(m) }
+func (*PublishRequest) ProtoMessage()    {}
+func (*PublishRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_5edf81766900dd99, []int{1}
+}
+
+func (m *PublishRequest) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_PublishRequest.Unmarshal(m, b)
+}
+func (m *PublishRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_PublishRequest.Marshal(b, m, deterministic)
+}
+func (m *PublishRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_PublishRequest.Merge(m, src)
+}
+func (m *PublishRequest) XXX_Size() int {
+	return xxx_messageInfo_PublishRequest.Size(m)
+}
+func (m *PublishRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_PublishRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_PublishRequest proto.InternalMessageInfo
+
+func (m *PublishRequest) GetTopic() string {
+	if m != nil {
+		return m.Topic
+	}
+	return ""
+}
+
+func (m *PublishRequest) GetMessage() *Message {
+	if m != nil {
+		return m.Message
+	}
+	return nil
+}
+
+type SubscribeRequest struct {
+	Topic                string   `protobuf:"bytes,1,opt,name=topic,proto3" json:"topic,omitempty"`
+	Queue                string   `protobuf:"bytes,2,opt,name=queue,proto3" json:"queue,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *SubscribeRequest) Reset()         { *m = SubscribeRequest{} }
+func (m *SubscribeRequest) String() string { return proto.CompactTextString(m) }
+func (*SubscribeRequest) ProtoMessage()    {}
+func (*SubscribeRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_5edf81766900dd99, []int{2}
+}
+
+func (m *SubscribeRequest) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_SubscribeRequest.Unmarshal(m, b)
+}
+func (m *SubscribeRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_SubscribeRequest.Marshal(b, m, deterministic)
+}
+func (m *SubscribeRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_SubscribeRequest.Merge(m, src)
+}
+func (m *SubscribeRequest) XXX_Size() int {
+	return xxx_messageInfo_SubscribeRequest.Size(m)
+}
+func (m *SubscribeRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_SubscribeRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_SubscribeRequest proto.InternalMessageInfo
+
+func (m *SubscribeRequest) GetTopic() string {
+	if m != nil {
+		return m.Topic
+	}
+	return ""
+}
+
+func (m *SubscribeRequest) GetQueue() string {
+	if m != nil {
+		return m.Queue
+	}
+	return ""
+}
+
+type Message struct {
+	Header               map[string]string `protobuf:"bytes,1,rep,name=header,proto3" json:"header,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	Body                 []byte            `protobuf:"bytes,2,opt,name=body,proto3" json:"body,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}          `json:"-"`
+	XXX_unrecognized     []byte            `json:"-"`
+	XXX_sizecache        int32             `json:"-"`
+}
+
+func (m *Message) Reset()         { *m = Message{} }
+func (m *Message) String() string { return proto.CompactTextString(m) }
+func (*Message) ProtoMessage()    {}
+func (*Message) Descriptor() ([]byte, []int) {
+	return fileDescriptor_5edf81766900dd99, []int{3}
+}
+
+func (m *Message) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_Message.Unmarshal(m, b)
+}
+func (m *Message) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_Message.Marshal(b, m, deterministic)
+}
+func (m *Message) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_Message.Merge(m, src)
+}
+func (m *Message) XXX_Size() int {
+	return xxx_messageInfo_Message.Size(m)
+}
+func (m *Message) XXX_DiscardUnknown() {
+	xxx_messageInfo_Message.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_Message proto.InternalMessageInfo
+
+func (m *Message) GetHeader() map[string]string {
+	if m != nil {
+		return m.Header
+	}
+	return nil
+}
+
+func (m *Message) GetBody() []byte {
+	if m != nil {
+		return m.Body
+	}
+	return nil
+}
+
+func init() {
+	proto.RegisterType((*Empty)(nil), "go.micro.broker.Empty")
+	proto.RegisterType((*PublishRequest)(nil), "go.micro.broker.PublishRequest")
+	proto.RegisterType((*SubscribeRequest)(nil), "go.micro.broker.SubscribeRequest")
+	proto.RegisterType((*Message)(nil), "go.micro.broker.Message")
+	proto.RegisterMapType((map[string]string)(nil), "go.micro.broker.Message.HeaderEntry")
+}
+
+func init() {
+	proto.RegisterFile("github.com/micro/go-micro/broker/proto/broker.proto", fileDescriptor_5edf81766900dd99)
+}
+
+var fileDescriptor_5edf81766900dd99 = []byte{
+	// 309 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x7c, 0x91, 0xcf, 0x4a, 0xf3, 0x40,
+	0x14, 0xc5, 0x3b, 0xed, 0xd7, 0x86, 0xde, 0x7e, 0x68, 0x19, 0x8a, 0x84, 0x6e, 0x8c, 0xc1, 0x45,
+	0x36, 0x4e, 0x24, 0xdd, 0xa8, 0x88, 0x0b, 0xb1, 0xe0, 0x42, 0x41, 0xc6, 0x9d, 0xbb, 0x4c, 0x3a,
+	0x24, 0xa1, 0x8d, 0x93, 0x4e, 0x66, 0x84, 0xbc, 0x88, 0x2b, 0x1f, 0x56, 0x3a, 0x93, 0xfa, 0xa7,
+	0xa1, 0xee, 0xee, 0x49, 0x7e, 0x73, 0xee, 0xe1, 0x5c, 0x98, 0xa5, 0xb9, 0xca, 0x34, 0x23, 0x89,
+	0x28, 0xc2, 0x22, 0x4f, 0xa4, 0x08, 0x53, 0x71, 0x66, 0x07, 0x26, 0xc5, 0x92, 0xcb, 0xb0, 0x94,
+	0x42, 0x6d, 0x05, 0x31, 0x02, 0x1f, 0xa6, 0x82, 0x18, 0x86, 0xd8, 0xcf, 0xbe, 0x03, 0xfd, 0x79,
+	0x51, 0xaa, 0xda, 0x7f, 0x81, 0x83, 0x27, 0xcd, 0x56, 0x79, 0x95, 0x51, 0xbe, 0xd6, 0xbc, 0x52,
+	0x78, 0x02, 0x7d, 0x25, 0xca, 0x3c, 0x71, 0x91, 0x87, 0x82, 0x21, 0xb5, 0x02, 0x47, 0xe0, 0x14,
+	0xbc, 0xaa, 0xe2, 0x94, 0xbb, 0x5d, 0x0f, 0x05, 0xa3, 0xc8, 0x25, 0x3b, 0x9e, 0xe4, 0xd1, 0xfe,
+	0xa7, 0x5b, 0xd0, 0xbf, 0x81, 0xf1, 0xb3, 0x66, 0x55, 0x22, 0x73, 0xc6, 0xff, 0x76, 0x9f, 0x40,
+	0x7f, 0xad, 0xb9, 0xb6, 0xde, 0x43, 0x6a, 0x85, 0xff, 0x8e, 0xc0, 0x69, 0x4c, 0xf1, 0x35, 0x0c,
+	0x32, 0x1e, 0x2f, 0xb8, 0x74, 0x91, 0xd7, 0x0b, 0x46, 0xd1, 0xe9, 0xbe, 0xf5, 0xe4, 0xde, 0x60,
+	0xf3, 0x57, 0x25, 0x6b, 0xda, 0xbc, 0xc1, 0x18, 0xfe, 0x31, 0xb1, 0xa8, 0x8d, 0xfd, 0x7f, 0x6a,
+	0xe6, 0xe9, 0x25, 0x8c, 0x7e, 0xa0, 0x78, 0x0c, 0xbd, 0x25, 0xaf, 0x9b, 0x58, 0x9b, 0x71, 0x13,
+	0xea, 0x2d, 0x5e, 0x7d, 0x87, 0x32, 0xe2, 0xaa, 0x7b, 0x81, 0xa2, 0x0f, 0x04, 0x83, 0x5b, 0xb3,
+	0x15, 0xdf, 0x81, 0xd3, 0xf4, 0x87, 0x8f, 0x5b, 0x91, 0x7e, 0x37, 0x3b, 0x3d, 0x6a, 0x01, 0xf6,
+	0x06, 0x1d, 0xfc, 0x00, 0xc3, 0xaf, 0xa6, 0xf0, 0x49, 0x0b, 0xdb, 0x6d, 0x71, 0xba, 0xb7, 0x7c,
+	0xbf, 0x73, 0x8e, 0xd8, 0xc0, 0x1c, 0x7d, 0xf6, 0x19, 0x00, 0x00, 0xff, 0xff, 0x25, 0x38, 0xfa,
+	0x02, 0x2b, 0x02, 0x00, 0x00,
+}
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ context.Context
+var _ grpc.ClientConn
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+const _ = grpc.SupportPackageIsVersion4
+
+// BrokerClient is the client API for Broker service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://godoc.org/google.golang.org/grpc#ClientConn.NewStream.
+type BrokerClient interface {
+	Publish(ctx context.Context, in *PublishRequest, opts ...grpc.CallOption) (*Empty, error)
+	Subscribe(ctx context.Context, in *SubscribeRequest, opts ...grpc.CallOption) (Broker_SubscribeClient, error)
+}
+
+type brokerClient struct {
+	cc *grpc.ClientConn
+}
+
+func NewBrokerClient(cc *grpc.ClientConn) BrokerClient {
+	return &brokerClient{cc}
+}
+
+func (c *brokerClient) Publish(ctx context.Context, in *PublishRequest, opts ...grpc.CallOption) (*Empty, error) {
+	out := new(Empty)
+	err := c.cc.Invoke(ctx, "/go.micro.broker.Broker/Publish", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *brokerClient) Subscribe(ctx context.Context, in *SubscribeRequest, opts ...grpc.CallOption) (Broker_SubscribeClient, error) {
+	stream, err := c.cc.NewStream(ctx, &_Broker_serviceDesc.Streams[0], "/go.micro.broker.Broker/Subscribe", opts...)
+	if err != nil {
+		return nil, err
+	}
+	x := &brokerSubscribeClient{stream}
+	if err := x.ClientStream.SendMsg(in); err != nil {
+		return nil, err
+	}
+	if err := x.ClientStream.CloseSend(); err != nil {
+		return nil, err
+	}
+	return x, nil
+}
+
+type Broker_SubscribeClient interface {
+	Recv() (*Message, error)
+	grpc.ClientStream
+}
+
+type brokerSubscribeClient struct {
+	grpc.ClientStream
+}
+
+func (x *brokerSubscribeClient) Recv() (*Message, error) {
+	m := new(Message)
+	if err := x.ClientStream.RecvMsg(m); err != nil {
+		return nil, err
+	}
+	return m, nil
+}
+
+// BrokerServer is the server API for Broker service.
+type BrokerServer interface {
+	Publish(context.Context, *PublishRequest) (*Empty, error)
+	Subscribe(*SubscribeRequest, Broker_SubscribeServer) error
+}
+
+func RegisterBrokerServer(s *grpc.Server, srv BrokerServer) {
+	s.RegisterService(&_Broker_serviceDesc, srv)
+}
+
+func _Broker_Publish_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(PublishRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(BrokerServer).Publish(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/go.micro.broker.Broker/Publish",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(BrokerServer).Publish(ctx, req.(*PublishRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _Broker_Subscribe_Handler(srv interface{}, stream grpc.ServerStream) error {
+	m := new(SubscribeRequest)
+	if err := stream.RecvMsg(m); err != nil {
+		return err
+	}
+	return srv.(BrokerServer).Subscribe(m, &brokerSubscribeServer{stream})
+}
+
+type Broker_SubscribeServer interface {
+	Send(*Message) error
+	grpc.ServerStream
+}
+
+type brokerSubscribeServer struct {
+	grpc.ServerStream
+}
+
+func (x *brokerSubscribeServer) Send(m *Message) error {
+	return x.ServerStream.SendMsg(m)
+}
+
+var _Broker_serviceDesc = grpc.ServiceDesc{
+	ServiceName: "go.micro.broker.Broker",
+	HandlerType: (*BrokerServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "Publish",
+			Handler:    _Broker_Publish_Handler,
+		},
+	},
+	Streams: []grpc.StreamDesc{
+		{
+			StreamName:    "Subscribe",
+			Handler:       _Broker_Subscribe_Handler,
+			ServerStreams: true,
+		},
+	},
+	Metadata: "github.com/micro/go-micro/broker/proto/broker.proto",
+}

broker/service/proto/broker.proto

@@ -0,0 +1,25 @@
+syntax = "proto3";
+
+package go.micro.broker;
+
+service Broker {
+	rpc Publish(PublishRequest) returns (Empty) {};
+	rpc Subscribe(SubscribeRequest) returns (stream Message) {};
+}
+
+message Empty {}
+
+message PublishRequest {
+	string topic = 1;
+	Message message = 2;
+}
+
+message SubscribeRequest {
+	string topic = 1;
+	string queue = 2;
+}
+
+message Message {
+	map<string,string> header = 1;
+	bytes body = 2;
+}

broker/service/service.go

@@ -0,0 +1,132 @@
+// Package service provides the broker service client
+package service
+
+import (
+	"context"
+	"time"
+
+	"github.com/micro/go-micro/broker"
+	pb "github.com/micro/go-micro/broker/service/proto"
+	"github.com/micro/go-micro/client"
+	"github.com/micro/go-micro/util/log"
+)
+
+type serviceBroker struct {
+	Addrs   []string
+	Client  pb.BrokerService
+	options broker.Options
+}
+
+var (
+	DefaultName = "go.micro.broker"
+)
+
+func (b *serviceBroker) Address() string {
+	return b.Addrs[0]
+}
+
+func (b *serviceBroker) Connect() error {
+	return nil
+}
+
+func (b *serviceBroker) Disconnect() error {
+	return nil
+}
+
+func (b *serviceBroker) Init(opts ...broker.Option) error {
+	for _, o := range opts {
+		o(&b.options)
+	}
+	return nil
+}
+
+func (b *serviceBroker) Options() broker.Options {
+	return b.options
+}
+
+func (b *serviceBroker) Publish(topic string, msg *broker.Message, opts ...broker.PublishOption) error {
+	log.Debugf("Publishing to topic %s broker %v", topic, b.Addrs)
+	_, err := b.Client.Publish(context.TODO(), &pb.PublishRequest{
+		Topic: topic,
+		Message: &pb.Message{
+			Header: msg.Header,
+			Body:   msg.Body,
+		},
+	}, client.WithAddress(b.Addrs...))
+	return err
+}
+
+func (b *serviceBroker) Subscribe(topic string, handler broker.Handler, opts ...broker.SubscribeOption) (broker.Subscriber, error) {
+	var options broker.SubscribeOptions
+	for _, o := range opts {
+		o(&options)
+	}
+	log.Debugf("Subscribing to topic %s queue %s broker %v", topic, options.Queue, b.Addrs)
+	stream, err := b.Client.Subscribe(context.TODO(), &pb.SubscribeRequest{
+		Topic: topic,
+		Queue: options.Queue,
+	}, client.WithAddress(b.Addrs...), client.WithRequestTimeout(time.Hour))
+	if err != nil {
+		return nil, err
+	}
+
+	sub := &serviceSub{
+		topic:   topic,
+		queue:   options.Queue,
+		handler: handler,
+		stream:  stream,
+		closed:  make(chan bool),
+		options: options,
+	}
+
+	go func() {
+		for {
+			select {
+			case <-sub.closed:
+				log.Debugf("Unsubscribed from topic %s", topic)
+				return
+			default:
+				// run the subscriber
+				log.Debugf("Streaming from broker %v to topic [%s] queue [%s]", b.Addrs, topic, options.Queue)
+				if err := sub.run(); err != nil {
+					log.Debugf("Resubscribing to topic %s broker %v", topic, b.Addrs)
+					stream, err := b.Client.Subscribe(context.TODO(), &pb.SubscribeRequest{
+						Topic: topic,
+						Queue: options.Queue,
+					}, client.WithAddress(b.Addrs...), client.WithRequestTimeout(time.Hour))
+					if err != nil {
+						log.Debugf("Failed to resubscribe to topic %s: %v", topic, err)
+						time.Sleep(time.Second)
+						continue
+					}
+					// new stream
+					sub.stream = stream
+				}
+			}
+		}
+	}()
+
+	return sub, nil
+}
+
+func (b *serviceBroker) String() string {
+	return "service"
+}
+
+func NewBroker(opts ...broker.Option) broker.Broker {
+	var options broker.Options
+	for _, o := range opts {
+		o(&options)
+	}
+
+	addrs := options.Addrs
+	if len(addrs) == 0 {
+		addrs = []string{"127.0.0.1:8001"}
+	}
+
+	return &serviceBroker{
+		Addrs:   addrs,
+		Client:  pb.NewBrokerService(DefaultName, client.DefaultClient),
+		options: options,
+	}
+}

broker/service/subscriber.go

@@ -0,0 +1,101 @@
+package service
+
+import (
+	"github.com/micro/go-micro/broker"
+	pb "github.com/micro/go-micro/broker/service/proto"
+	"github.com/micro/go-micro/util/log"
+)
+
+type serviceSub struct {
+	topic   string
+	queue   string
+	handler broker.Handler
+	stream  pb.Broker_SubscribeService
+	closed  chan bool
+	options broker.SubscribeOptions
+}
+
+type serviceEvent struct {
+	topic   string
+	message *broker.Message
+}
+
+func (s *serviceEvent) Topic() string {
+	return s.topic
+}
+
+func (s *serviceEvent) Message() *broker.Message {
+	return s.message
+}
+
+func (s *serviceEvent) Ack() error {
+	return nil
+}
+
+func (s *serviceSub) isClosed() bool {
+	select {
+	case <-s.closed:
+		return true
+	default:
+		return false
+	}
+}
+
+func (s *serviceSub) run() error {
+	exit := make(chan bool)
+	go func() {
+		select {
+		case <-exit:
+		case <-s.closed:
+		}
+
+		// close the stream
+		s.stream.Close()
+	}()
+
+	for {
+		// TODO: do not fail silently
+		msg, err := s.stream.Recv()
+		if err != nil {
+			log.Debugf("Streaming error for subcription to topic %s: %v", s.Topic(), err)
+
+			// close the exit channel
+			close(exit)
+
+			// don't return an error if we unsubscribed
+			if s.isClosed() {
+				return nil
+			}
+
+			// return stream error
+			return err
+		}
+
+		// TODO: handle error
+		s.handler(&serviceEvent{
+			topic: s.topic,
+			message: &broker.Message{
+				Header: msg.Header,
+				Body:   msg.Body,
+			},
+		})
+	}
+}
+
+func (s *serviceSub) Options() broker.SubscribeOptions {
+	return s.options
+}
+
+func (s *serviceSub) Topic() string {
+	return s.topic
+}
+
+func (s *serviceSub) Unsubscribe() error {
+	select {
+	case <-s.closed:
+		return nil
+	default:
+		close(s.closed)
+	}
+	return nil
+}

client/grpc/codec.go

@@ -30,6 +30,7 @@ var (
 		"application/proto":        protoCodec{},
 		"application/protobuf":     protoCodec{},
 		"application/octet-stream": protoCodec{},
+		"application/grpc":         protoCodec{},
 		"application/grpc+json":    jsonCodec{},
 		"application/grpc+proto":   protoCodec{},
 		"application/grpc+bytes":   bytesCodec{},

client/grpc/grpc.go

@@ -18,7 +18,6 @@ import (
 	"github.com/micro/go-micro/registry"
 	"github.com/micro/go-micro/transport"
 
-	"github.com/micro/go-micro/util/buf"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/credentials"
 	"google.golang.org/grpc/encoding"
@@ -73,10 +72,11 @@ func (g *grpcClient) next(request client.Request, opts client.CallOptions) (sele
 
 	// get next nodes from the selector
 	next, err := g.opts.Selector.Select(service, opts.SelectOptions...)
-	if err != nil && err == selector.ErrNotFound {
-		return nil, errors.NotFound("go.micro.client", err.Error())
-	} else if err != nil {
-		return nil, errors.InternalServerError("go.micro.client", err.Error())
+	if err != nil {
+		if err == selector.ErrNotFound {
+			return nil, errors.InternalServerError("go.micro.client", "service %s: %s", service, err.Error())
+		}
+		return nil, errors.InternalServerError("go.micro.client", "error selecting %s node: %s", service, err.Error())
 	}
 
 	return next, nil
@@ -110,12 +110,21 @@ func (g *grpcClient) call(ctx context.Context, node *registry.Node, req client.R
 
 	var grr error
 
-	cc, err := g.pool.getConn(address, grpc.WithDefaultCallOptions(grpc.ForceCodec(cf)),
-		grpc.WithTimeout(opts.DialTimeout), g.secure(),
+	grpcDialOptions := []grpc.DialOption{
+		grpc.WithDefaultCallOptions(grpc.ForceCodec(cf)),
+		grpc.WithTimeout(opts.DialTimeout),
+		g.secure(),
 		grpc.WithDefaultCallOptions(
 			grpc.MaxCallRecvMsgSize(maxRecvMsgSize),
 			grpc.MaxCallSendMsgSize(maxSendMsgSize),
-		))
+		),
+	}
+
+	if opts := g.getGrpcDialOptions(); opts != nil {
+		grpcDialOptions = append(grpcDialOptions, opts...)
+	}
+
+	cc, err := g.pool.getConn(address, grpcDialOptions...)
 	if err != nil {
 		return errors.InternalServerError("go.micro.client", fmt.Sprintf("Error sending request: %v", err))
 	}
@@ -127,7 +136,11 @@ func (g *grpcClient) call(ctx context.Context, node *registry.Node, req client.R
 	ch := make(chan error, 1)
 
 	go func() {
-		err := cc.Invoke(ctx, methodToGRPC(req.Service(), req.Endpoint()), req.Body(), rsp, grpc.CallContentSubtype(cf.Name()))
+		grpcCallOptions := []grpc.CallOption{grpc.CallContentSubtype(cf.Name())}
+		if opts := g.getGrpcCallOptions(); opts != nil {
+			grpcCallOptions = append(grpcCallOptions, opts...)
+		}
+		err := cc.Invoke(ctx, methodToGRPC(req.Service(), req.Endpoint()), req.Body(), rsp, grpcCallOptions...)
 		ch <- microError(err)
 	}()
 
@@ -175,7 +188,16 @@ func (g *grpcClient) stream(ctx context.Context, node *registry.Node, req client
 
 	wc := wrapCodec{cf}
 
-	cc, err := grpc.DialContext(dialCtx, address, grpc.WithDefaultCallOptions(grpc.ForceCodec(wc)), g.secure())
+	grpcDialOptions := []grpc.DialOption{
+		grpc.WithDefaultCallOptions(grpc.ForceCodec(wc)),
+		g.secure(),
+	}
+
+	if opts := g.getGrpcDialOptions(); opts != nil {
+		grpcDialOptions = append(grpcDialOptions, opts...)
+	}
+
+	cc, err := grpc.DialContext(dialCtx, address, grpcDialOptions...)
 	if err != nil {
 		return nil, errors.InternalServerError("go.micro.client", fmt.Sprintf("Error sending request: %v", err))
 	}
@@ -186,7 +208,11 @@ func (g *grpcClient) stream(ctx context.Context, node *registry.Node, req client
 		ServerStreams: true,
 	}
 
-	st, err := cc.NewStream(ctx, desc, methodToGRPC(req.Service(), req.Endpoint()))
+	grpcCallOptions := []grpc.CallOption{}
+	if opts := g.getGrpcCallOptions(); opts != nil {
+		grpcCallOptions = append(grpcCallOptions, opts...)
+	}
+	st, err := cc.NewStream(ctx, desc, methodToGRPC(req.Service(), req.Endpoint()), grpcCallOptions...)
 	if err != nil {
 		return nil, errors.InternalServerError("go.micro.client", fmt.Sprintf("Error creating stream: %v", err))
 	}
@@ -350,15 +376,17 @@ func (g *grpcClient) Call(ctx context.Context, req client.Request, rsp interface
 
 		// select next node
 		node, err := next()
-		if err != nil && err == selector.ErrNotFound {
-			return errors.NotFound("go.micro.client", err.Error())
-		} else if err != nil {
-			return errors.InternalServerError("go.micro.client", err.Error())
+		service := req.Service()
+		if err != nil {
+			if err == selector.ErrNotFound {
+				return errors.InternalServerError("go.micro.client", "service %s: %s", service, err.Error())
+			}
+			return errors.InternalServerError("go.micro.client", "error selecting %s node: %s", service, err.Error())
 		}
 
 		// make the call
 		err = gcall(ctx, node, req, rsp, callOpts)
-		g.opts.Selector.Mark(req.Service(), node, err)
+		g.opts.Selector.Mark(service, node, err)
 		return err
 	}
 
@@ -429,14 +457,16 @@ func (g *grpcClient) Stream(ctx context.Context, req client.Request, opts ...cli
 		}
 
 		node, err := next()
-		if err != nil && err == selector.ErrNotFound {
-			return nil, errors.NotFound("go.micro.client", err.Error())
-		} else if err != nil {
-			return nil, errors.InternalServerError("go.micro.client", err.Error())
+		service := req.Service()
+		if err != nil {
+			if err == selector.ErrNotFound {
+				return nil, errors.InternalServerError("go.micro.client", "service %s: %s", service, err.Error())
+			}
+			return nil, errors.InternalServerError("go.micro.client", "error selecting %s node: %s", service, err.Error())
 		}
 
 		stream, err := g.stream(ctx, node, req, callOpts)
-		g.opts.Selector.Mark(req.Service(), node, err)
+		g.opts.Selector.Mark(service, node, err)
 		return stream, err
 	}
 
@@ -486,14 +516,13 @@ func (g *grpcClient) Publish(ctx context.Context, p client.Message, opts ...clie
 	}
 	md["Content-Type"] = p.ContentType()
 
-	cf, err := g.newCodec(p.ContentType())
+	cf, err := g.newGRPCCodec(p.ContentType())
 	if err != nil {
 		return errors.InternalServerError("go.micro.client", err.Error())
 	}
 
-	b := buf.New(nil)
-
-	if err := cf(b).Write(&codec.Message{Type: codec.Event}, p.Payload()); err != nil {
+	b, err := cf.Marshal(p.Payload())
+	if err != nil {
 		return errors.InternalServerError("go.micro.client", err.Error())
 	}
 
@@ -503,7 +532,7 @@ func (g *grpcClient) Publish(ctx context.Context, p client.Message, opts ...clie
 
 	return g.opts.Broker.Publish(p.Topic(), &broker.Message{
 		Header: md,
-		Body:   b.Bytes(),
+		Body:   b,
 	})
 }
 
@@ -511,6 +540,46 @@ func (g *grpcClient) String() string {
 	return "grpc"
 }
 
+func (g *grpcClient) getGrpcDialOptions() []grpc.DialOption {
+	if g.opts.CallOptions.Context == nil {
+		return nil
+	}
+
+	v := g.opts.CallOptions.Context.Value(grpcDialOptions{})
+
+	if v == nil {
+		return nil
+	}
+
+	opts, ok := v.([]grpc.DialOption)
+
+	if !ok {
+		return nil
+	}
+
+	return opts
+}
+
+func (g *grpcClient) getGrpcCallOptions() []grpc.CallOption {
+	if g.opts.CallOptions.Context == nil {
+		return nil
+	}
+
+	v := g.opts.CallOptions.Context.Value(grpcCallOptions{})
+
+	if v == nil {
+		return nil
+	}
+
+	opts, ok := v.([]grpc.CallOption)
+
+	if !ok {
+		return nil
+	}
+
+	return opts
+}
+
 func newClient(opts ...client.Option) client.Client {
 	options := client.Options{
 		Codecs: make(map[string]codec.NewCodec),

client/grpc/options.go

@@ -6,6 +6,7 @@ import (
 	"crypto/tls"
 
 	"github.com/micro/go-micro/client"
+	"google.golang.org/grpc"
 	"google.golang.org/grpc/encoding"
 )
 
@@ -23,6 +24,8 @@ type codecsKey struct{}
 type tlsAuth struct{}
 type maxRecvMsgSizeKey struct{}
 type maxSendMsgSizeKey struct{}
+type grpcDialOptions struct{}
+type grpcCallOptions struct{}
 
 // gRPC Codec to be used to encode/decode requests for a given content type
 func Codec(contentType string, c encoding.Codec) client.Option {
@@ -72,3 +75,27 @@ func MaxSendMsgSize(s int) client.Option {
 		o.Context = context.WithValue(o.Context, maxSendMsgSizeKey{}, s)
 	}
 }
+
+//
+// DialOptions to be used to configure gRPC dial options
+//
+func DialOptions(opts ...grpc.DialOption) client.CallOption {
+	return func(o *client.CallOptions) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, grpcDialOptions{}, opts)
+	}
+}
+
+//
+// CallOptions to be used to configure gRPC call options
+//
+func CallOptions(opts ...grpc.CallOption) client.CallOption {
+	return func(o *client.CallOptions) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, grpcCallOptions{}, opts)
+	}
+}

client/proto/client.micro.go

@@ -31,37 +31,37 @@ var _ context.Context
 var _ client.Option
 var _ server.Option
 
-// Client API for Micro service
+// Client API for Client service
 
-type MicroService interface {
+type ClientService interface {
 	// Call allows a single request to be made
 	Call(ctx context.Context, in *Request, opts ...client.CallOption) (*Response, error)
 	// Stream is a bidirectional stream
-	Stream(ctx context.Context, opts ...client.CallOption) (Micro_StreamService, error)
+	Stream(ctx context.Context, opts ...client.CallOption) (Client_StreamService, error)
 	// Publish publishes a message and returns an empty Message
 	Publish(ctx context.Context, in *Message, opts ...client.CallOption) (*Message, error)
 }
 
-type microService struct {
+type clientService struct {
 	c    client.Client
 	name string
 }
 
-func NewMicroService(name string, c client.Client) MicroService {
+func NewClientService(name string, c client.Client) ClientService {
 	if c == nil {
 		c = client.NewClient()
 	}
 	if len(name) == 0 {
 		name = "go.micro.client"
 	}
-	return &microService{
+	return &clientService{
 		c:    c,
 		name: name,
 	}
 }
 
-func (c *microService) Call(ctx context.Context, in *Request, opts ...client.CallOption) (*Response, error) {
-	req := c.c.NewRequest(c.name, "Micro.Call", in)
+func (c *clientService) Call(ctx context.Context, in *Request, opts ...client.CallOption) (*Response, error) {
+	req := c.c.NewRequest(c.name, "Client.Call", in)
 	out := new(Response)
 	err := c.c.Call(ctx, req, out, opts...)
 	if err != nil {
@@ -70,16 +70,16 @@ func (c *microService) Call(ctx context.Context, in *Request, opts ...client.Cal
 	return out, nil
 }
 
-func (c *microService) Stream(ctx context.Context, opts ...client.CallOption) (Micro_StreamService, error) {
-	req := c.c.NewRequest(c.name, "Micro.Stream", &Request{})
+func (c *clientService) Stream(ctx context.Context, opts ...client.CallOption) (Client_StreamService, error) {
+	req := c.c.NewRequest(c.name, "Client.Stream", &Request{})
 	stream, err := c.c.Stream(ctx, req, opts...)
 	if err != nil {
 		return nil, err
 	}
-	return &microServiceStream{stream}, nil
+	return &clientServiceStream{stream}, nil
 }
 
-type Micro_StreamService interface {
+type Client_StreamService interface {
 	SendMsg(interface{}) error
 	RecvMsg(interface{}) error
 	Close() error
@@ -87,27 +87,27 @@ type Micro_StreamService interface {
 	Recv() (*Response, error)
 }
 
-type microServiceStream struct {
+type clientServiceStream struct {
 	stream client.Stream
 }
 
-func (x *microServiceStream) Close() error {
+func (x *clientServiceStream) Close() error {
 	return x.stream.Close()
 }
 
-func (x *microServiceStream) SendMsg(m interface{}) error {
+func (x *clientServiceStream) SendMsg(m interface{}) error {
 	return x.stream.Send(m)
 }
 
-func (x *microServiceStream) RecvMsg(m interface{}) error {
+func (x *clientServiceStream) RecvMsg(m interface{}) error {
 	return x.stream.Recv(m)
 }
 
-func (x *microServiceStream) Send(m *Request) error {
+func (x *clientServiceStream) Send(m *Request) error {
 	return x.stream.Send(m)
 }
 
-func (x *microServiceStream) Recv() (*Response, error) {
+func (x *clientServiceStream) Recv() (*Response, error) {
 	m := new(Response)
 	err := x.stream.Recv(m)
 	if err != nil {
@@ -116,8 +116,8 @@ func (x *microServiceStream) Recv() (*Response, error) {
 	return m, nil
 }
 
-func (c *microService) Publish(ctx context.Context, in *Message, opts ...client.CallOption) (*Message, error) {
-	req := c.c.NewRequest(c.name, "Micro.Publish", in)
+func (c *clientService) Publish(ctx context.Context, in *Message, opts ...client.CallOption) (*Message, error) {
+	req := c.c.NewRequest(c.name, "Client.Publish", in)
 	out := new(Message)
 	err := c.c.Call(ctx, req, out, opts...)
 	if err != nil {
@@ -126,43 +126,43 @@ func (c *microService) Publish(ctx context.Context, in *Message, opts ...client.
 	return out, nil
 }
 
-// Server API for Micro service
+// Server API for Client service
 
-type MicroHandler interface {
+type ClientHandler interface {
 	// Call allows a single request to be made
 	Call(context.Context, *Request, *Response) error
 	// Stream is a bidirectional stream
-	Stream(context.Context, Micro_StreamStream) error
+	Stream(context.Context, Client_StreamStream) error
 	// Publish publishes a message and returns an empty Message
 	Publish(context.Context, *Message, *Message) error
 }
 
-func RegisterMicroHandler(s server.Server, hdlr MicroHandler, opts ...server.HandlerOption) error {
-	type micro interface {
+func RegisterClientHandler(s server.Server, hdlr ClientHandler, opts ...server.HandlerOption) error {
+	type client interface {
 		Call(ctx context.Context, in *Request, out *Response) error
 		Stream(ctx context.Context, stream server.Stream) error
 		Publish(ctx context.Context, in *Message, out *Message) error
 	}
-	type Micro struct {
-		micro
+	type Client struct {
+		client
 	}
-	h := &microHandler{hdlr}
-	return s.Handle(s.NewHandler(&Micro{h}, opts...))
+	h := &clientHandler{hdlr}
+	return s.Handle(s.NewHandler(&Client{h}, opts...))
 }
 
-type microHandler struct {
-	MicroHandler
+type clientHandler struct {
+	ClientHandler
 }
 
-func (h *microHandler) Call(ctx context.Context, in *Request, out *Response) error {
-	return h.MicroHandler.Call(ctx, in, out)
+func (h *clientHandler) Call(ctx context.Context, in *Request, out *Response) error {
+	return h.ClientHandler.Call(ctx, in, out)
 }
 
-func (h *microHandler) Stream(ctx context.Context, stream server.Stream) error {
-	return h.MicroHandler.Stream(ctx, &microStreamStream{stream})
+func (h *clientHandler) Stream(ctx context.Context, stream server.Stream) error {
+	return h.ClientHandler.Stream(ctx, &clientStreamStream{stream})
 }
 
-type Micro_StreamStream interface {
+type Client_StreamStream interface {
 	SendMsg(interface{}) error
 	RecvMsg(interface{}) error
 	Close() error
@@ -170,27 +170,27 @@ type Micro_StreamStream interface {
 	Recv() (*Request, error)
 }
 
-type microStreamStream struct {
+type clientStreamStream struct {
 	stream server.Stream
 }
 
-func (x *microStreamStream) Close() error {
+func (x *clientStreamStream) Close() error {
 	return x.stream.Close()
 }
 
-func (x *microStreamStream) SendMsg(m interface{}) error {
+func (x *clientStreamStream) SendMsg(m interface{}) error {
 	return x.stream.Send(m)
 }
 
-func (x *microStreamStream) RecvMsg(m interface{}) error {
+func (x *clientStreamStream) RecvMsg(m interface{}) error {
 	return x.stream.Recv(m)
 }
 
-func (x *microStreamStream) Send(m *Response) error {
+func (x *clientStreamStream) Send(m *Response) error {
 	return x.stream.Send(m)
 }
 
-func (x *microStreamStream) Recv() (*Request, error) {
+func (x *clientStreamStream) Recv() (*Request, error) {
 	m := new(Request)
 	if err := x.stream.Recv(m); err != nil {
 		return nil, err
@@ -198,6 +198,6 @@ func (x *microStreamStream) Recv() (*Request, error) {
 	return m, nil
 }
 
-func (h *microHandler) Publish(ctx context.Context, in *Message, out *Message) error {
-	return h.MicroHandler.Publish(ctx, in, out)
+func (h *clientHandler) Publish(ctx context.Context, in *Message, out *Message) error {
+	return h.ClientHandler.Publish(ctx, in, out)
 }

client/proto/client.pb.go

@@ -191,23 +191,23 @@ func init() {
 
 var fileDescriptor_7d733ae29171347b = []byte{
 	// 270 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x9c, 0x91, 0x3f, 0x4f, 0xc3, 0x30,
-	0x10, 0xc5, 0xeb, 0xfe, 0x4b, 0x39, 0x2a, 0x21, 0x9d, 0x18, 0x4c, 0x06, 0x54, 0x32, 0x65, 0xc1,
-	0x45, 0x30, 0x23, 0x86, 0xce, 0x95, 0x50, 0x40, 0xac, 0x28, 0x71, 0x4f, 0xc1, 0x52, 0x6a, 0x9b,
-	0xd8, 0xad, 0x94, 0xef, 0xc8, 0x87, 0x42, 0x38, 0x29, 0x45, 0xd0, 0x2e, 0x6c, 0xf7, 0xee, 0x67,
-	0xbd, 0x3b, 0xbf, 0x83, 0x74, 0xad, 0x64, 0x6d, 0xe6, 0xa5, 0xb9, 0x6e, 0x0b, 0x59, 0x29, 0xd2,
-	0x7e, 0x6e, 0x6b, 0xe3, 0x77, 0x42, 0x04, 0x81, 0x67, 0xa5, 0x11, 0xe1, 0x8d, 0x68, 0xdb, 0xc9,
-	0x16, 0xa2, 0x8c, 0xde, 0x37, 0xe4, 0x3c, 0x72, 0x88, 0x1c, 0xd5, 0x5b, 0x25, 0x89, 0xb3, 0x19,
-	0x4b, 0x4f, 0xb2, 0x9d, 0xc4, 0x18, 0x26, 0xa4, 0x57, 0xd6, 0x28, 0xed, 0x79, 0x3f, 0xa0, 0x6f,
-	0x8d, 0x57, 0x30, 0x95, 0x46, 0x7b, 0xd2, 0xfe, 0xd5, 0x37, 0x96, 0xf8, 0x20, 0xf0, 0xd3, 0xae,
-	0xf7, 0xdc, 0x58, 0x42, 0x84, 0x61, 0x61, 0x56, 0x0d, 0x1f, 0xce, 0x58, 0x3a, 0xcd, 0x42, 0x9d,
-	0x5c, 0xc2, 0x24, 0x23, 0x67, 0x8d, 0x76, 0x7b, 0xce, 0x7e, 0xf0, 0x17, 0x88, 0x96, 0xe4, 0x5c,
-	0x5e, 0x12, 0x9e, 0xc3, 0xc8, 0x1b, 0xab, 0x64, 0xb7, 0x55, 0x2b, 0xfe, 0xcc, 0xed, 0x1f, 0x9f,
-	0x3b, 0xd8, 0xfb, 0xde, 0x7e, 0x30, 0x18, 0x2d, 0xbf, 0x02, 0xc0, 0x7b, 0x18, 0x2e, 0xf2, 0xaa,
-	0x42, 0x2e, 0x7e, 0x65, 0x22, 0xba, 0x40, 0xe2, 0x8b, 0x03, 0xa4, 0x5d, 0x39, 0xe9, 0xe1, 0x02,
-	0xc6, 0x4f, 0xbe, 0xa6, 0x7c, 0xfd, 0x4f, 0x83, 0x94, 0xdd, 0x30, 0x7c, 0x80, 0xe8, 0x71, 0x53,
-	0x54, 0xca, 0xbd, 0x1d, 0x70, 0xe9, 0xfe, 0x1f, 0x1f, 0x25, 0x49, 0xaf, 0x18, 0x87, 0xb3, 0xde,
-	0x7d, 0x06, 0x00, 0x00, 0xff, 0xff, 0xd3, 0x63, 0x94, 0x1a, 0x02, 0x02, 0x00, 0x00,
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x9c, 0x91, 0x41, 0x4b, 0xc3, 0x40,
+	0x10, 0x85, 0xbb, 0x6d, 0x4c, 0xea, 0x58, 0x10, 0x06, 0x0f, 0x6b, 0x0e, 0x52, 0x73, 0xca, 0xc5,
+	0x54, 0xf4, 0x2c, 0x1e, 0x72, 0x16, 0x24, 0x8a, 0x57, 0x49, 0xb6, 0x43, 0x5c, 0x48, 0x77, 0xd7,
+	0xec, 0xb6, 0x90, 0x1f, 0xe9, 0x7f, 0x12, 0x36, 0xa9, 0x15, 0x6d, 0x2f, 0xbd, 0xcd, 0x9b, 0x6f,
+	0x79, 0x33, 0xfb, 0x06, 0xd2, 0x95, 0x14, 0xad, 0x5e, 0xd4, 0xfa, 0xa6, 0x2f, 0x44, 0x23, 0x49,
+	0xb9, 0x85, 0x69, 0xb5, 0xdb, 0x8a, 0xcc, 0x0b, 0x3c, 0xaf, 0x75, 0xe6, 0xdf, 0x64, 0x7d, 0x3b,
+	0xd9, 0x40, 0x54, 0xd0, 0xe7, 0x9a, 0xac, 0x43, 0x0e, 0x91, 0xa5, 0x76, 0x23, 0x05, 0x71, 0x36,
+	0x67, 0xe9, 0x69, 0xb1, 0x95, 0x18, 0xc3, 0x94, 0xd4, 0xd2, 0x68, 0xa9, 0x1c, 0x1f, 0x7b, 0xf4,
+	0xa3, 0xf1, 0x1a, 0x66, 0x42, 0x2b, 0x47, 0xca, 0xbd, 0xbb, 0xce, 0x10, 0x9f, 0x78, 0x7e, 0x36,
+	0xf4, 0x5e, 0x3b, 0x43, 0x88, 0x10, 0x54, 0x7a, 0xd9, 0xf1, 0x60, 0xce, 0xd2, 0x59, 0xe1, 0xeb,
+	0xe4, 0x0a, 0xa6, 0x05, 0x59, 0xa3, 0x95, 0xdd, 0x71, 0xf6, 0x8b, 0xbf, 0x41, 0xf4, 0x44, 0xd6,
+	0x96, 0x35, 0xe1, 0x05, 0x9c, 0x38, 0x6d, 0xa4, 0x18, 0xb6, 0xea, 0xc5, 0xbf, 0xb9, 0xe3, 0xc3,
+	0x73, 0x27, 0x3b, 0xdf, 0xbb, 0x2f, 0x06, 0x61, 0xee, 0xbf, 0x8e, 0x0f, 0x10, 0xe4, 0x65, 0xd3,
+	0x20, 0xcf, 0xfe, 0x84, 0x92, 0x0d, 0x89, 0xc4, 0x97, 0x7b, 0x48, 0xbf, 0x73, 0x32, 0xc2, 0x1c,
+	0xc2, 0x17, 0xd7, 0x52, 0xb9, 0x3a, 0xd2, 0x20, 0x65, 0xb7, 0x0c, 0x1f, 0x21, 0x7a, 0x5e, 0x57,
+	0x8d, 0xb4, 0x1f, 0x7b, 0x5c, 0x86, 0x00, 0xe2, 0x83, 0x24, 0x19, 0x55, 0xa1, 0xbf, 0xeb, 0xfd,
+	0x77, 0x00, 0x00, 0x00, 0xff, 0xff, 0x0a, 0x76, 0x1f, 0x51, 0x03, 0x02, 0x00, 0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -218,59 +218,59 @@ var _ grpc.ClientConn
 // is compatible with the grpc package it is being compiled against.
 const _ = grpc.SupportPackageIsVersion4
 
-// MicroClient is the client API for Micro service.
+// ClientClient is the client API for Client service.
 //
 // For semantics around ctx use and closing/ending streaming RPCs, please refer to https://godoc.org/google.golang.org/grpc#ClientConn.NewStream.
-type MicroClient interface {
+type ClientClient interface {
 	// Call allows a single request to be made
 	Call(ctx context.Context, in *Request, opts ...grpc.CallOption) (*Response, error)
 	// Stream is a bidirectional stream
-	Stream(ctx context.Context, opts ...grpc.CallOption) (Micro_StreamClient, error)
+	Stream(ctx context.Context, opts ...grpc.CallOption) (Client_StreamClient, error)
 	// Publish publishes a message and returns an empty Message
 	Publish(ctx context.Context, in *Message, opts ...grpc.CallOption) (*Message, error)
 }
 
-type microClient struct {
+type clientClient struct {
 	cc *grpc.ClientConn
 }
 
-func NewMicroClient(cc *grpc.ClientConn) MicroClient {
-	return &microClient{cc}
+func NewClientClient(cc *grpc.ClientConn) ClientClient {
+	return &clientClient{cc}
 }
 
-func (c *microClient) Call(ctx context.Context, in *Request, opts ...grpc.CallOption) (*Response, error) {
+func (c *clientClient) Call(ctx context.Context, in *Request, opts ...grpc.CallOption) (*Response, error) {
 	out := new(Response)
-	err := c.cc.Invoke(ctx, "/go.micro.client.Micro/Call", in, out, opts...)
+	err := c.cc.Invoke(ctx, "/go.micro.client.Client/Call", in, out, opts...)
 	if err != nil {
 		return nil, err
 	}
 	return out, nil
 }
 
-func (c *microClient) Stream(ctx context.Context, opts ...grpc.CallOption) (Micro_StreamClient, error) {
-	stream, err := c.cc.NewStream(ctx, &_Micro_serviceDesc.Streams[0], "/go.micro.client.Micro/Stream", opts...)
+func (c *clientClient) Stream(ctx context.Context, opts ...grpc.CallOption) (Client_StreamClient, error) {
+	stream, err := c.cc.NewStream(ctx, &_Client_serviceDesc.Streams[0], "/go.micro.client.Client/Stream", opts...)
 	if err != nil {
 		return nil, err
 	}
-	x := &microStreamClient{stream}
+	x := &clientStreamClient{stream}
 	return x, nil
 }
 
-type Micro_StreamClient interface {
+type Client_StreamClient interface {
 	Send(*Request) error
 	Recv() (*Response, error)
 	grpc.ClientStream
 }
 
-type microStreamClient struct {
+type clientStreamClient struct {
 	grpc.ClientStream
 }
 
-func (x *microStreamClient) Send(m *Request) error {
+func (x *clientStreamClient) Send(m *Request) error {
 	return x.ClientStream.SendMsg(m)
 }
 
-func (x *microStreamClient) Recv() (*Response, error) {
+func (x *clientStreamClient) Recv() (*Response, error) {
 	m := new(Response)
 	if err := x.ClientStream.RecvMsg(m); err != nil {
 		return nil, err
@@ -278,66 +278,66 @@ func (x *microStreamClient) Recv() (*Response, error) {
 	return m, nil
 }
 
-func (c *microClient) Publish(ctx context.Context, in *Message, opts ...grpc.CallOption) (*Message, error) {
+func (c *clientClient) Publish(ctx context.Context, in *Message, opts ...grpc.CallOption) (*Message, error) {
 	out := new(Message)
-	err := c.cc.Invoke(ctx, "/go.micro.client.Micro/Publish", in, out, opts...)
+	err := c.cc.Invoke(ctx, "/go.micro.client.Client/Publish", in, out, opts...)
 	if err != nil {
 		return nil, err
 	}
 	return out, nil
 }
 
-// MicroServer is the server API for Micro service.
-type MicroServer interface {
+// ClientServer is the server API for Client service.
+type ClientServer interface {
 	// Call allows a single request to be made
 	Call(context.Context, *Request) (*Response, error)
 	// Stream is a bidirectional stream
-	Stream(Micro_StreamServer) error
+	Stream(Client_StreamServer) error
 	// Publish publishes a message and returns an empty Message
 	Publish(context.Context, *Message) (*Message, error)
 }
 
-func RegisterMicroServer(s *grpc.Server, srv MicroServer) {
-	s.RegisterService(&_Micro_serviceDesc, srv)
+func RegisterClientServer(s *grpc.Server, srv ClientServer) {
+	s.RegisterService(&_Client_serviceDesc, srv)
 }
 
-func _Micro_Call_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+func _Client_Call_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
 	in := new(Request)
 	if err := dec(in); err != nil {
 		return nil, err
 	}
 	if interceptor == nil {
-		return srv.(MicroServer).Call(ctx, in)
+		return srv.(ClientServer).Call(ctx, in)
 	}
 	info := &grpc.UnaryServerInfo{
 		Server:     srv,
-		FullMethod: "/go.micro.client.Micro/Call",
+		FullMethod: "/go.micro.client.Client/Call",
 	}
 	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
-		return srv.(MicroServer).Call(ctx, req.(*Request))
+		return srv.(ClientServer).Call(ctx, req.(*Request))
 	}
 	return interceptor(ctx, in, info, handler)
 }
 
-func _Micro_Stream_Handler(srv interface{}, stream grpc.ServerStream) error {
-	return srv.(MicroServer).Stream(&microStreamServer{stream})
+func _Client_Stream_Handler(srv interface{}, stream grpc.ServerStream) error {
+	return srv.(ClientServer).Stream(&clientStreamServer{stream})
 }
 
-type Micro_StreamServer interface {
+type Client_StreamServer interface {
 	Send(*Response) error
 	Recv() (*Request, error)
 	grpc.ServerStream
 }
 
-type microStreamServer struct {
+type clientStreamServer struct {
 	grpc.ServerStream
 }
 
-func (x *microStreamServer) Send(m *Response) error {
+func (x *clientStreamServer) Send(m *Response) error {
 	return x.ServerStream.SendMsg(m)
 }
 
-func (x *microStreamServer) Recv() (*Request, error) {
+func (x *clientStreamServer) Recv() (*Request, error) {
 	m := new(Request)
 	if err := x.ServerStream.RecvMsg(m); err != nil {
 		return nil, err
@@ -345,41 +345,41 @@ func (x *microStreamServer) Recv() (*Request, error) {
 	return m, nil
 }
 
-func _Micro_Publish_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+func _Client_Publish_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
 	in := new(Message)
 	if err := dec(in); err != nil {
 		return nil, err
 	}
 	if interceptor == nil {
-		return srv.(MicroServer).Publish(ctx, in)
+		return srv.(ClientServer).Publish(ctx, in)
 	}
 	info := &grpc.UnaryServerInfo{
 		Server:     srv,
-		FullMethod: "/go.micro.client.Micro/Publish",
+		FullMethod: "/go.micro.client.Client/Publish",
 	}
 	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
-		return srv.(MicroServer).Publish(ctx, req.(*Message))
+		return srv.(ClientServer).Publish(ctx, req.(*Message))
 	}
 	return interceptor(ctx, in, info, handler)
 }
 
-var _Micro_serviceDesc = grpc.ServiceDesc{
-	ServiceName: "go.micro.client.Micro",
-	HandlerType: (*MicroServer)(nil),
+var _Client_serviceDesc = grpc.ServiceDesc{
+	ServiceName: "go.micro.client.Client",
+	HandlerType: (*ClientServer)(nil),
 	Methods: []grpc.MethodDesc{
 		{
 			MethodName: "Call",
-			Handler:    _Micro_Call_Handler,
+			Handler:    _Client_Call_Handler,
 		},
 		{
 			MethodName: "Publish",
-			Handler:    _Micro_Publish_Handler,
+			Handler:    _Client_Publish_Handler,
 		},
 	},
 	Streams: []grpc.StreamDesc{
 		{
 			StreamName:    "Stream",
-			Handler:       _Micro_Stream_Handler,
+			Handler:       _Client_Stream_Handler,
 			ServerStreams: true,
 			ClientStreams: true,
 		},

client/proto/client.proto

@@ -2,8 +2,8 @@ syntax = "proto3";
 
 package go.micro.client;
 
-// Micro is the micro client interface
-service Micro {
+// Client is the micro client interface
+service Client {
 	// Call allows a single request to be made
 	rpc Call(Request) returns (Response) {};
 	// Stream is a bidirectional stream

client/rpc_client.go

@@ -96,19 +96,22 @@ func (r *rpcClient) call(ctx context.Context, node *registry.Node, req Request,
 		}
 	}
 
-	var grr error
-	c, err := r.pool.Get(address, transport.WithTimeout(opts.DialTimeout))
+	dOpts := []transport.DialOption{
+		transport.WithStream(),
+	}
+
+	if opts.DialTimeout >= 0 {
+		dOpts = append(dOpts, transport.WithTimeout(opts.DialTimeout))
+	}
+
+	c, err := r.pool.Get(address, dOpts...)
 	if err != nil {
 		return errors.InternalServerError("go.micro.client", "connection error: %v", err)
 	}
-	defer func() {
-		// defer execution of release
-		r.pool.Release(c, grr)
-	}()
 
 	seq := atomic.LoadUint64(&r.seq)
 	atomic.AddUint64(&r.seq, 1)
-	codec := newRpcCodec(msg, c, cf)
+	codec := newRpcCodec(msg, c, cf, "")
 
 	rsp := &rpcResponse{
 		socket: c,
@@ -116,15 +119,19 @@ func (r *rpcClient) call(ctx context.Context, node *registry.Node, req Request,
 	}
 
 	stream := &rpcStream{
+		id:       fmt.Sprintf("%v", seq),
 		context:  ctx,
 		request:  req,
 		response: rsp,
 		codec:    codec,
 		closed:   make(chan bool),
-		id:       fmt.Sprintf("%v", seq),
+		release:  func(err error) { r.pool.Release(c, err) },
+		sendEOS:  false,
 	}
+	// close the stream on exiting this function
 	defer stream.Close()
 
+	// wait for error response
 	ch := make(chan error, 1)
 
 	go func() {
@@ -150,14 +157,26 @@ func (r *rpcClient) call(ctx context.Context, node *registry.Node, req Request,
 		ch <- nil
 	}()
 
+	var grr error
+
 	select {
 	case err := <-ch:
 		grr = err
 		return err
 	case <-ctx.Done():
-		grr = ctx.Err()
-		return errors.Timeout("go.micro.client", fmt.Sprintf("%v", ctx.Err()))
+		grr = errors.Timeout("go.micro.client", fmt.Sprintf("%v", ctx.Err()))
 	}
+
+	// set the stream error
+	if grr != nil {
+		stream.Lock()
+		stream.err = grr
+		stream.Unlock()
+
+		return grr
+	}
+
+	return nil
 }
 
 func (r *rpcClient) stream(ctx context.Context, node *registry.Node, req Request, opts CallOptions) (Stream, error) {
@@ -206,7 +225,13 @@ func (r *rpcClient) stream(ctx context.Context, node *registry.Node, req Request
 		return nil, errors.InternalServerError("go.micro.client", "connection error: %v", err)
 	}
 
-	codec := newRpcCodec(msg, c, cf)
+	// increment the sequence number
+	seq := atomic.LoadUint64(&r.seq)
+	atomic.AddUint64(&r.seq, 1)
+	id := fmt.Sprintf("%v", seq)
+
+	// create codec with stream id
+	codec := newRpcCodec(msg, c, cf, id)
 
 	rsp := &rpcResponse{
 		socket: c,
@@ -219,16 +244,24 @@ func (r *rpcClient) stream(ctx context.Context, node *registry.Node, req Request
 	}
 
 	stream := &rpcStream{
+		id:       id,
 		context:  ctx,
 		request:  req,
 		response: rsp,
-		closed:   make(chan bool),
 		codec:    codec,
+		// used to close the stream
+		closed: make(chan bool),
+		// signal the end of stream,
+		sendEOS: true,
+		// release func
+		release: func(err error) { c.Close() },
 	}
 
+	// wait for error response
 	ch := make(chan error, 1)
 
 	go func() {
+		// send the first message
 		ch <- stream.Send(req.Body())
 	}()
 
@@ -242,6 +275,12 @@ func (r *rpcClient) stream(ctx context.Context, node *registry.Node, req Request
 	}
 
 	if grr != nil {
+		// set the error
+		stream.Lock()
+		stream.err = grr
+		stream.Unlock()
+
+		// close the stream
 		stream.Close()
 		return nil, grr
 	}
@@ -312,10 +351,11 @@ func (r *rpcClient) next(request Request, opts CallOptions) (selector.Next, erro
 
 	// get next nodes from the selector
 	next, err := r.opts.Selector.Select(service, opts.SelectOptions...)
-	if err != nil && err == selector.ErrNotFound {
-		return nil, errors.NotFound("go.micro.client", "service %s: %v", service, err.Error())
-	} else if err != nil {
-		return nil, errors.InternalServerError("go.micro.client", "error selecting %s node: %v", service, err.Error())
+	if err != nil {
+		if err == selector.ErrNotFound {
+			return nil, errors.InternalServerError("go.micro.client", "service %s: %s", service, err.Error())
+		}
+		return nil, errors.InternalServerError("go.micro.client", "error selecting %s node: %s", service, err.Error())
 	}
 
 	return next, nil
@@ -375,15 +415,17 @@ func (r *rpcClient) Call(ctx context.Context, request Request, response interfac
 
 		// select next node
 		node, err := next()
-		if err != nil && err == selector.ErrNotFound {
-			return errors.NotFound("go.micro.client", "service %s: %v", request.Service(), err.Error())
-		} else if err != nil {
-			return errors.InternalServerError("go.micro.client", "error getting next %s node: %v", request.Service(), err.Error())
+		service := request.Service()
+		if err != nil {
+			if err == selector.ErrNotFound {
+				return errors.InternalServerError("go.micro.client", "service %s: %s", service, err.Error())
+			}
+			return errors.InternalServerError("go.micro.client", "error getting next %s node: %s", service, err.Error())
 		}
 
 		// make the call
 		err = rcall(ctx, node, request, response, callOpts)
-		r.opts.Selector.Mark(request.Service(), node, err)
+		r.opts.Selector.Mark(service, node, err)
 		return err
 	}
 
@@ -452,14 +494,16 @@ func (r *rpcClient) Stream(ctx context.Context, request Request, opts ...CallOpt
 		}
 
 		node, err := next()
-		if err != nil && err == selector.ErrNotFound {
-			return nil, errors.NotFound("go.micro.client", "service %s: %v", request.Service(), err.Error())
-		} else if err != nil {
-			return nil, errors.InternalServerError("go.micro.client", "error getting next %s node: %v", request.Service(), err.Error())
+		service := request.Service()
+		if err != nil {
+			if err == selector.ErrNotFound {
+				return nil, errors.InternalServerError("go.micro.client", "service %s: %s", service, err.Error())
+			}
+			return nil, errors.InternalServerError("go.micro.client", "error getting next %s node: %s", service, err.Error())
 		}
 
 		stream, err := r.stream(ctx, node, request, callOpts)
-		r.opts.Selector.Mark(request.Service(), node, err)
+		r.opts.Selector.Mark(service, node, err)
 		return stream, err
 	}
 

client/rpc_codec.go

@@ -39,6 +39,9 @@ type rpcCodec struct {
 
 	req *transport.Message
 	buf *readWriteCloser
+
+	// signify if its a stream
+	stream string
 }
 
 type readWriteCloser struct {
@@ -113,7 +116,7 @@ func getHeaders(m *codec.Message) {
 	}
 }
 
-func setHeaders(m *codec.Message) {
+func setHeaders(m *codec.Message, stream string) {
 	set := func(hdr, v string) {
 		if len(v) == 0 {
 			return
@@ -126,6 +129,11 @@ func setHeaders(m *codec.Message) {
 	set("Micro-Service", m.Target)
 	set("Micro-Method", m.Method)
 	set("Micro-Endpoint", m.Endpoint)
+	set("Micro-Error", m.Error)
+
+	if len(stream) > 0 {
+		set("Micro-Stream", stream)
+	}
 }
 
 // setupProtocol sets up the old protocol
@@ -149,7 +157,7 @@ func setupProtocol(msg *transport.Message, node *registry.Node) codec.NewCodec {
 	return defaultCodecs[msg.Header["Content-Type"]]
 }
 
-func newRpcCodec(req *transport.Message, client transport.Client, c codec.NewCodec) codec.Codec {
+func newRpcCodec(req *transport.Message, client transport.Client, c codec.NewCodec, stream string) codec.Codec {
 	rwc := &readWriteCloser{
 		wbuf: bytes.NewBuffer(nil),
 		rbuf: bytes.NewBuffer(nil),
@@ -159,6 +167,7 @@ func newRpcCodec(req *transport.Message, client transport.Client, c codec.NewCod
 		client: client,
 		codec:  c(rwc),
 		req:    req,
+		stream: stream,
 	}
 	return r
 }
@@ -177,7 +186,7 @@ func (c *rpcCodec) Write(m *codec.Message, body interface{}) error {
 	}
 
 	// set the mucp headers
-	setHeaders(m)
+	setHeaders(m, c.stream)
 
 	// if body is bytes Frame don't encode
 	if body != nil {
@@ -240,6 +249,12 @@ func (c *rpcCodec) ReadHeader(m *codec.Message, r codec.MessageType) error {
 
 func (c *rpcCodec) ReadBody(b interface{}) error {
 	// read body
+	// read raw data
+	if v, ok := b.(*raw.Frame); ok {
+		v.Data = c.buf.rbuf.Bytes()
+		return nil
+	}
+
 	if err := c.codec.ReadBody(b); err != nil {
 		return errors.InternalServerError("go.micro.client.codec", err.Error())
 	}

client/rpc_stream.go

@@ -18,6 +18,12 @@ type rpcStream struct {
 	response Response
 	codec    codec.Codec
 	context  context.Context
+
+	// signal whether we should send EOS
+	sendEOS bool
+
+	// release releases the connection back to the pool
+	release func(err error)
 }
 
 func (r *rpcStream) isClosed() bool {
@@ -120,6 +126,26 @@ func (r *rpcStream) Close() error {
 		return nil
 	default:
 		close(r.closed)
-		return r.codec.Close()
+
+		// send the end of stream message
+		if r.sendEOS {
+			// no need to check for error
+			r.codec.Write(&codec.Message{
+				Id:       r.id,
+				Target:   r.request.Service(),
+				Method:   r.request.Method(),
+				Endpoint: r.request.Endpoint(),
+				Type:     codec.Error,
+				Error:    lastStreamResponseError,
+			}, nil)
+		}
+
+		err := r.codec.Close()
+
+		// release the connection
+		r.release(r.Error())
+
+		// return the codec error
+		return err
 	}
 }

client/selector/default.go

@@ -51,6 +51,9 @@ func (c *registrySelector) Select(service string, opts ...SelectOption) (Next, e
 	// if that fails go directly to the registry
 	services, err := c.rc.GetService(service)
 	if err != nil {
+		if err == registry.ErrNotFound {
+			return nil, ErrNotFound
+		}
 		return nil, err
 	}
 

client/selector/router/router.go

@@ -9,9 +9,9 @@ import (
 
 	"github.com/micro/go-micro/client"
 	"github.com/micro/go-micro/client/selector"
-	"github.com/micro/go-micro/network/router"
-	pb "github.com/micro/go-micro/network/router/proto"
 	"github.com/micro/go-micro/registry"
+	"github.com/micro/go-micro/router"
+	pb "github.com/micro/go-micro/router/proto"
 )
 
 type routerSelector struct {
@@ -43,9 +43,9 @@ type routerKey struct{}
 func (r *routerSelector) getRoutes(service string) ([]router.Route, error) {
 	if !r.remote {
 		// lookup router for routes for the service
-		return r.r.Lookup(router.NewQuery(
+		return r.r.Lookup(
 			router.QueryService(service),
-		))
+		)
 	}
 
 	// lookup the remote router

codec/grpc/grpc.go

@@ -89,9 +89,22 @@ func (c *Codec) Write(m *codec.Message, b interface{}) error {
 		m.Header[":authority"] = m.Target
 		m.Header["content-type"] = c.ContentType
 	case codec.Response:
-		m.Header["Trailer"] = "grpc-status, grpc-message"
+		m.Header["Trailer"] = "grpc-status" //, grpc-message"
+		m.Header["content-type"] = c.ContentType
+		m.Header[":status"] = "200"
 		m.Header["grpc-status"] = "0"
-		m.Header["grpc-message"] = ""
+		//		m.Header["grpc-message"] = ""
+	case codec.Error:
+		m.Header["Trailer"] = "grpc-status, grpc-message"
+		// micro end of stream
+		if m.Error == "EOS" {
+			m.Header["grpc-status"] = "0"
+		} else {
+			m.Header["grpc-message"] = m.Error
+			m.Header["grpc-status"] = "13"
+		}
+
+		return nil
 	}
 
 	// marshal content

config/cmd/cmd.go

@@ -23,13 +23,15 @@ import (
 	"github.com/micro/go-micro/broker/http"
 	"github.com/micro/go-micro/broker/memory"
 	"github.com/micro/go-micro/broker/nats"
+	brokerSrv "github.com/micro/go-micro/broker/service"
 
 	// registries
 	"github.com/micro/go-micro/registry"
 	"github.com/micro/go-micro/registry/consul"
-	"github.com/micro/go-micro/registry/gossip"
+	"github.com/micro/go-micro/registry/etcd"
 	"github.com/micro/go-micro/registry/mdns"
 	rmem "github.com/micro/go-micro/registry/memory"
+	regSrv "github.com/micro/go-micro/registry/service"
 
 	// selectors
 	"github.com/micro/go-micro/client/selector"
@@ -42,6 +44,7 @@ import (
 	tgrpc "github.com/micro/go-micro/transport/grpc"
 	thttp "github.com/micro/go-micro/transport/http"
 	tmem "github.com/micro/go-micro/transport/memory"
+	"github.com/micro/go-micro/transport/quic"
 )
 
 type Cmd interface {
@@ -94,11 +97,13 @@ var (
 		cli.IntFlag{
 			Name:   "register_ttl",
 			EnvVar: "MICRO_REGISTER_TTL",
+			Value:  60,
 			Usage:  "Register TTL in seconds",
 		},
 		cli.IntFlag{
 			Name:   "register_interval",
 			EnvVar: "MICRO_REGISTER_INTERVAL",
+			Value:  30,
 			Usage:  "Register interval in seconds",
 		},
 		cli.StringFlag{
@@ -150,7 +155,7 @@ var (
 		cli.StringFlag{
 			Name:   "registry",
 			EnvVar: "MICRO_REGISTRY",
-			Usage:  "Registry for discovery. consul, mdns",
+			Usage:  "Registry for discovery. consul, etcd, mdns",
 		},
 		cli.StringFlag{
 			Name:   "registry_address",
@@ -175,9 +180,11 @@ var (
 	}
 
 	DefaultBrokers = map[string]func(...broker.Option) broker.Broker{
-		"http":   http.NewBroker,
-		"memory": memory.NewBroker,
-		"nats":   nats.NewBroker,
+		"go.micro.broker": brokerSrv.NewBroker,
+		"service":         brokerSrv.NewBroker,
+		"http":            http.NewBroker,
+		"memory":          memory.NewBroker,
+		"nats":            nats.NewBroker,
 	}
 
 	DefaultClients = map[string]func(...client.Option) client.Client{
@@ -187,10 +194,12 @@ var (
 	}
 
 	DefaultRegistries = map[string]func(...registry.Option) registry.Registry{
-		"consul": consul.NewRegistry,
-		"gossip": gossip.NewRegistry,
-		"mdns":   mdns.NewRegistry,
-		"memory": rmem.NewRegistry,
+		"go.micro.registry": regSrv.NewRegistry,
+		"service":           regSrv.NewRegistry,
+		"consul":            consul.NewRegistry,
+		"etcd":              etcd.NewRegistry,
+		"mdns":              mdns.NewRegistry,
+		"memory":            rmem.NewRegistry,
 	}
 
 	DefaultSelectors = map[string]func(...selector.Option) selector.Selector{
@@ -211,6 +220,7 @@ var (
 		"memory": tmem.NewTransport,
 		"http":   thttp.NewTransport,
 		"grpc":   tgrpc.NewTransport,
+		"quic":   quic.NewTransport,
 	}
 
 	// used for default selection as the fall back
@@ -415,11 +425,11 @@ func (c *cmd) Before(ctx *cli.Context) error {
 		serverOpts = append(serverOpts, server.Advertise(ctx.String("server_advertise")))
 	}
 
-	if ttl := time.Duration(ctx.GlobalInt("register_ttl")); ttl > 0 {
+	if ttl := time.Duration(ctx.GlobalInt("register_ttl")); ttl >= 0 {
 		serverOpts = append(serverOpts, server.RegisterTTL(ttl*time.Second))
 	}
 
-	if val := time.Duration(ctx.GlobalInt("register_interval")); val > 0 {
+	if val := time.Duration(ctx.GlobalInt("register_interval")); val >= 0 {
 		serverOpts = append(serverOpts, server.RegisterInterval(val*time.Second))
 	}
 

config/default_test.go

@@ -12,6 +12,10 @@ import (
 	"github.com/micro/go-micro/config/source/file"
 )
 
+var (
+	sep = string(os.PathSeparator)
+)
+
 func createFileForIssue18(t *testing.T, content string) *os.File {
 	data := []byte(content)
 	path := filepath.Join(os.TempDir(), fmt.Sprintf("file.%d", time.Now().UnixNano()))

config/source/consul/README.md

@@ -1,49 +0,0 @@
-# Consul Source
-
-The consul source reads config from consul key/values
-
-## Consul Format
-
-The consul source expects keys under the default prefix `/micro/config`
-
-Values are expected to be json
-
-```
-// set database
-consul kv put micro/config/database '{"address": "10.0.0.1", "port": 3306}'
-// set cache
-consul kv put micro/config/cache '{"address": "10.0.0.2", "port": 6379}'
-```
-
-Keys are split on `/` so access becomes
-
-```
-conf.Get("micro", "config", "database")
-```
-
-## New Source
-
-Specify source with data
-
-```go
-consulSource := consul.NewSource(
-	// optionally specify consul address; default to localhost:8500
-	consul.WithAddress("10.0.0.10:8500"),
-	// optionally specify prefix; defaults to /micro/config
-	consul.WithPrefix("/my/prefix"),
-  // optionally strip the provided prefix from the keys, defaults to false
-  consul.StripPrefix(true),
-)
-```
-
-## Load Source
-
-Load the source into config
-
-```go
-// Create new config
-conf := config.NewConfig()
-
-// Load file source
-conf.Load(consulSource)
-```

config/source/consul/consul.go

@@ -1,126 +0,0 @@
-package consul
-
-import (
-	"fmt"
-	"net"
-	"time"
-
-	"github.com/hashicorp/consul/api"
-	"github.com/micro/go-micro/config/source"
-)
-
-// Currently a single consul reader
-type consul struct {
-	prefix      string
-	stripPrefix string
-	addr        string
-	opts        source.Options
-	client      *api.Client
-}
-
-var (
-	// DefaultPrefix is the prefix that consul keys will be assumed to have if you
-	// haven't specified one
-	DefaultPrefix = "/micro/config/"
-)
-
-func (c *consul) Read() (*source.ChangeSet, error) {
-	kv, _, err := c.client.KV().List(c.prefix, nil)
-	if err != nil {
-		return nil, err
-	}
-
-	if kv == nil || len(kv) == 0 {
-		return nil, fmt.Errorf("source not found: %s", c.prefix)
-	}
-
-	data, err := makeMap(c.opts.Encoder, kv, c.stripPrefix)
-	if err != nil {
-		return nil, fmt.Errorf("error reading data: %v", err)
-	}
-
-	b, err := c.opts.Encoder.Encode(data)
-	if err != nil {
-		return nil, fmt.Errorf("error reading source: %v", err)
-	}
-
-	cs := &source.ChangeSet{
-		Timestamp: time.Now(),
-		Format:    c.opts.Encoder.String(),
-		Source:    c.String(),
-		Data:      b,
-	}
-	cs.Checksum = cs.Sum()
-
-	return cs, nil
-}
-
-func (c *consul) String() string {
-	return "consul"
-}
-
-func (c *consul) Watch() (source.Watcher, error) {
-	w, err := newWatcher(c.prefix, c.addr, c.String(), c.stripPrefix, c.opts.Encoder)
-	if err != nil {
-		return nil, err
-	}
-	return w, nil
-}
-
-// NewSource creates a new consul source
-func NewSource(opts ...source.Option) source.Source {
-	options := source.NewOptions(opts...)
-
-	// use default config
-	config := api.DefaultConfig()
-
-	// use the consul config passed in the options if any
-	if co, ok := options.Context.Value(configKey{}).(*api.Config); ok {
-		config = co
-	}
-
-	// check if there are any addrs
-	a, ok := options.Context.Value(addressKey{}).(string)
-	if ok {
-		addr, port, err := net.SplitHostPort(a)
-		if ae, ok := err.(*net.AddrError); ok && ae.Err == "missing port in address" {
-			port = "8500"
-			addr = a
-			config.Address = fmt.Sprintf("%s:%s", addr, port)
-		} else if err == nil {
-			config.Address = fmt.Sprintf("%s:%s", addr, port)
-		}
-	}
-
-	dc, ok := options.Context.Value(dcKey{}).(string)
-	if ok {
-		config.Datacenter = dc
-	}
-
-	token, ok := options.Context.Value(tokenKey{}).(string)
-	if ok {
-		config.Token = token
-	}
-
-	// create the client
-	client, _ := api.NewClient(config)
-
-	prefix := DefaultPrefix
-	sp := ""
-	f, ok := options.Context.Value(prefixKey{}).(string)
-	if ok {
-		prefix = f
-	}
-
-	if b, ok := options.Context.Value(stripPrefixKey{}).(bool); ok && b {
-		sp = prefix
-	}
-
-	return &consul{
-		prefix:      prefix,
-		stripPrefix: sp,
-		addr:        config.Address,
-		opts:        options,
-		client:      client,
-	}
-}

config/source/consul/util.go

@@ -1,89 +0,0 @@
-package consul
-
-import (
-	"fmt"
-	"strings"
-
-	"github.com/hashicorp/consul/api"
-	"github.com/micro/go-micro/config/encoder"
-)
-
-type configValue interface {
-	Value() interface{}
-	Decode(encoder.Encoder, []byte) error
-}
-type configArrayValue struct {
-	v []interface{}
-}
-
-func (a *configArrayValue) Value() interface{} { return a.v }
-func (a *configArrayValue) Decode(e encoder.Encoder, b []byte) error {
-	return e.Decode(b, &a.v)
-}
-
-type configMapValue struct {
-	v map[string]interface{}
-}
-
-func (m *configMapValue) Value() interface{} { return m.v }
-func (m *configMapValue) Decode(e encoder.Encoder, b []byte) error {
-	return e.Decode(b, &m.v)
-}
-
-func makeMap(e encoder.Encoder, kv api.KVPairs, stripPrefix string) (map[string]interface{}, error) {
-
-	data := make(map[string]interface{})
-
-	// consul guarantees lexicographic order, so no need to sort
-	for _, v := range kv {
-		pathString := strings.TrimPrefix(strings.TrimPrefix(v.Key, strings.TrimPrefix(stripPrefix, "/")), "/")
-		if pathString == "" {
-			continue
-		}
-		var val configValue
-		var err error
-
-		// ensure a valid value is stored at this location
-		if len(v.Value) > 0 {
-			// try to decode into map value or array value
-			arrayV := &configArrayValue{v: []interface{}{}}
-			mapV := &configMapValue{v: map[string]interface{}{}}
-			switch {
-			case arrayV.Decode(e, v.Value) == nil:
-				val = arrayV
-			case mapV.Decode(e, v.Value) == nil:
-				val = mapV
-			default:
-				return nil, fmt.Errorf("faild decode value. path: %s, error: %s", pathString, err)
-			}
-		}
-
-		// set target at the root
-		target := data
-		path := strings.Split(pathString, "/")
-		// find (or create) the leaf node we want to put this value at
-		for _, dir := range path[:len(path)-1] {
-			if _, ok := target[dir]; !ok {
-				target[dir] = make(map[string]interface{})
-			}
-			target = target[dir].(map[string]interface{})
-		}
-
-		leafDir := path[len(path)-1]
-
-		// copy over the keys from the value
-		switch val.(type) {
-		case *configArrayValue:
-			target[leafDir] = val.Value()
-		case *configMapValue:
-			target[leafDir] = make(map[string]interface{})
-			target = target[leafDir].(map[string]interface{})
-			mapv := val.Value().(map[string]interface{})
-			for k := range mapv {
-				target[k] = mapv[k]
-			}
-		}
-	}
-
-	return data, nil
-}

config/source/consul/watcher.go

@@ -1,96 +0,0 @@
-package consul
-
-import (
-	"errors"
-	"time"
-
-	"github.com/hashicorp/consul/api"
-	"github.com/hashicorp/consul/api/watch"
-	"github.com/micro/go-micro/config/encoder"
-	"github.com/micro/go-micro/config/source"
-)
-
-type watcher struct {
-	e           encoder.Encoder
-	name        string
-	stripPrefix string
-
-	wp   *watch.Plan
-	ch   chan *source.ChangeSet
-	exit chan bool
-}
-
-func newWatcher(key, addr, name, stripPrefix string, e encoder.Encoder) (source.Watcher, error) {
-	w := &watcher{
-		e:           e,
-		name:        name,
-		stripPrefix: stripPrefix,
-		ch:          make(chan *source.ChangeSet),
-		exit:        make(chan bool),
-	}
-
-	wp, err := watch.Parse(map[string]interface{}{"type": "keyprefix", "prefix": key})
-	if err != nil {
-		return nil, err
-	}
-
-	wp.Handler = w.handle
-
-	// wp.Run is a blocking call and will prevent newWatcher from returning
-	go wp.Run(addr)
-
-	w.wp = wp
-
-	return w, nil
-}
-
-func (w *watcher) handle(idx uint64, data interface{}) {
-	if data == nil {
-		return
-	}
-
-	kvs, ok := data.(api.KVPairs)
-	if !ok {
-		return
-	}
-
-	d, err := makeMap(w.e, kvs, w.stripPrefix)
-	if err != nil {
-		return
-	}
-
-	b, err := w.e.Encode(d)
-	if err != nil {
-		return
-	}
-
-	cs := &source.ChangeSet{
-		Timestamp: time.Now(),
-		Format:    w.e.String(),
-		Source:    w.name,
-		Data:      b,
-	}
-	cs.Checksum = cs.Sum()
-
-	w.ch <- cs
-}
-
-func (w *watcher) Next() (*source.ChangeSet, error) {
-	select {
-	case cs := <-w.ch:
-		return cs, nil
-	case <-w.exit:
-		return nil, errors.New("watcher stopped")
-	}
-}
-
-func (w *watcher) Stop() error {
-	select {
-	case <-w.exit:
-		return nil
-	default:
-		w.wp.Stop()
-		close(w.exit)
-	}
-	return nil
-}

config/source/env/README.md

@@ -91,6 +91,6 @@ Load the source into config
 // Create new config
 conf := config.NewConfig()
 
-// Load file source
+// Load env source
 conf.Load(src)
 ```

config/source/env/env_test.go

@@ -86,8 +86,8 @@ func TestEnvvar_Prefixes(t *testing.T) {
 }
 
 func TestEnvvar_WatchNextNoOpsUntilStop(t *testing.T) {
-	source := NewSource(WithStrippedPrefix("GOMICRO_"))
-	w, err := source.Watch()
+	src := NewSource(WithStrippedPrefix("GOMICRO_"))
+	w, err := src.Watch()
 	if err != nil {
 		t.Error(err)
 	}
@@ -97,7 +97,7 @@ func TestEnvvar_WatchNextNoOpsUntilStop(t *testing.T) {
 		w.Stop()
 	}()
 
-	if _, err := w.Next(); err.Error() != "watcher stopped" {
+	if _, err := w.Next(); err != source.ErrWatcherStopped {
 		t.Errorf("expected watcher stopped error, got %v", err)
 	}
 }

config/source/env/watcher.go

@@ -1,8 +1,6 @@
 package env
 
 import (
-	"errors"
-
 	"github.com/micro/go-micro/config/source"
 )
 
@@ -13,7 +11,7 @@ type watcher struct {
 func (w *watcher) Next() (*source.ChangeSet, error) {
 	<-w.exit
 
-	return nil, errors.New("watcher stopped")
+	return nil, source.ErrWatcherStopped
 }
 
 func (w *watcher) Stop() error {

config/source/etcd/README.md

@@ -0,0 +1,51 @@
+# Etcd Source
+
+The etcd source reads config from etcd key/values
+
+This source supports etcd version 3 and beyond.
+
+## Etcd Format
+
+The etcd source expects keys under the default prefix `/micro/config` (prefix can be changed)
+
+Values are expected to be JSON
+
+```
+// set database
+etcdctl put /micro/config/database '{"address": "10.0.0.1", "port": 3306}'
+// set cache
+etcdctl put /micro/config/cache '{"address": "10.0.0.2", "port": 6379}'
+```
+
+Keys are split on `/` so access becomes
+
+```
+conf.Get("micro", "config", "database")
+```
+
+## New Source
+
+Specify source with data
+
+```go
+etcdSource := etcd.NewSource(
+	// optionally specify etcd address; default to localhost:8500
+	etcd.WithAddress("10.0.0.10:8500"),
+	// optionally specify prefix; defaults to /micro/config
+	etcd.WithPrefix("/my/prefix"),
+	// optionally strip the provided prefix from the keys, defaults to false
+	etcd.StripPrefix(true),
+)
+```
+
+## Load Source
+
+Load the source into config
+
+```go
+// Create new config
+conf := config.NewConfig()
+
+// Load file source
+conf.Load(etcdSource)
+```

config/source/etcd/etcd.go

@@ -0,0 +1,141 @@
+package etcd
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"time"
+
+	cetcd "github.com/coreos/etcd/clientv3"
+	"github.com/coreos/etcd/mvcc/mvccpb"
+	"github.com/micro/go-micro/config/source"
+)
+
+// Currently a single etcd reader
+type etcd struct {
+	prefix      string
+	stripPrefix string
+	opts        source.Options
+	client      *cetcd.Client
+	cerr        error
+}
+
+var (
+	DefaultPrefix = "/micro/config/"
+)
+
+func (c *etcd) Read() (*source.ChangeSet, error) {
+	if c.cerr != nil {
+		return nil, c.cerr
+	}
+
+	rsp, err := c.client.Get(context.Background(), c.prefix, cetcd.WithPrefix())
+	if err != nil {
+		return nil, err
+	}
+
+	if rsp == nil || len(rsp.Kvs) == 0 {
+		return nil, fmt.Errorf("source not found: %s", c.prefix)
+	}
+
+	var kvs []*mvccpb.KeyValue
+	for _, v := range rsp.Kvs {
+		kvs = append(kvs, (*mvccpb.KeyValue)(v))
+	}
+
+	data := makeMap(c.opts.Encoder, kvs, c.stripPrefix)
+
+	b, err := c.opts.Encoder.Encode(data)
+	if err != nil {
+		return nil, fmt.Errorf("error reading source: %v", err)
+	}
+
+	cs := &source.ChangeSet{
+		Timestamp: time.Now(),
+		Source:    c.String(),
+		Data:      b,
+		Format:    c.opts.Encoder.String(),
+	}
+	cs.Checksum = cs.Sum()
+
+	return cs, nil
+}
+
+func (c *etcd) String() string {
+	return "etcd"
+}
+
+func (c *etcd) Watch() (source.Watcher, error) {
+	if c.cerr != nil {
+		return nil, c.cerr
+	}
+	cs, err := c.Read()
+	if err != nil {
+		return nil, err
+	}
+	return newWatcher(c.prefix, c.stripPrefix, c.client.Watcher, cs, c.opts)
+}
+
+func NewSource(opts ...source.Option) source.Source {
+	options := source.NewOptions(opts...)
+
+	var endpoints []string
+
+	// check if there are any addrs
+	addrs, ok := options.Context.Value(addressKey{}).([]string)
+	if ok {
+		for _, a := range addrs {
+			addr, port, err := net.SplitHostPort(a)
+			if ae, ok := err.(*net.AddrError); ok && ae.Err == "missing port in address" {
+				port = "2379"
+				addr = a
+				endpoints = append(endpoints, fmt.Sprintf("%s:%s", addr, port))
+			} else if err == nil {
+				endpoints = append(endpoints, fmt.Sprintf("%s:%s", addr, port))
+			}
+		}
+	}
+
+	if len(endpoints) == 0 {
+		endpoints = []string{"localhost:2379"}
+	}
+
+	// check dial timeout option
+	dialTimeout, ok := options.Context.Value(dialTimeoutKey{}).(time.Duration)
+	if !ok {
+		dialTimeout = 3 * time.Second // default dial timeout
+	}
+
+	config := cetcd.Config{
+		Endpoints:   endpoints,
+		DialTimeout: dialTimeout,
+	}
+
+	u, ok := options.Context.Value(authKey{}).(*authCreds)
+	if ok {
+		config.Username = u.Username
+		config.Password = u.Password
+	}
+
+	// use default config
+	client, err := cetcd.New(config)
+
+	prefix := DefaultPrefix
+	sp := ""
+	f, ok := options.Context.Value(prefixKey{}).(string)
+	if ok {
+		prefix = f
+	}
+
+	if b, ok := options.Context.Value(stripPrefixKey{}).(bool); ok && b {
+		sp = prefix
+	}
+
+	return &etcd{
+		prefix:      prefix,
+		stripPrefix: sp,
+		opts:        options,
+		client:      client,
+		cerr:        err,
+	}
+}

config/source/etcd/options.go

@@ -1,21 +1,25 @@
-package consul
+package etcd
 
 import (
 	"context"
+	"time"
 
-	"github.com/hashicorp/consul/api"
 	"github.com/micro/go-micro/config/source"
 )
 
 type addressKey struct{}
 type prefixKey struct{}
 type stripPrefixKey struct{}
-type dcKey struct{}
-type tokenKey struct{}
-type configKey struct{}
+type authKey struct{}
+type dialTimeoutKey struct{}
 
-// WithAddress sets the consul address
-func WithAddress(a string) source.Option {
+type authCreds struct {
+	Username string
+	Password string
+}
+
+// WithAddress sets the etcd address
+func WithAddress(a ...string) source.Option {
 	return func(o *source.Options) {
 		if o.Context == nil {
 			o.Context = context.Background()
@@ -45,31 +49,22 @@ func StripPrefix(strip bool) source.Option {
 	}
 }
 
-func WithDatacenter(p string) source.Option {
+// Auth allows you to specify username/password
+func Auth(username, password string) source.Option {
 	return func(o *source.Options) {
 		if o.Context == nil {
 			o.Context = context.Background()
 		}
-		o.Context = context.WithValue(o.Context, dcKey{}, p)
+		o.Context = context.WithValue(o.Context, authKey{}, &authCreds{Username: username, Password: password})
 	}
 }
 
-// WithToken sets the key token to use
-func WithToken(p string) source.Option {
+// WithDialTimeout set the time out for dialing to etcd
+func WithDialTimeout(timeout time.Duration) source.Option {
 	return func(o *source.Options) {
 		if o.Context == nil {
 			o.Context = context.Background()
 		}
-		o.Context = context.WithValue(o.Context, tokenKey{}, p)
-	}
-}
-
-// WithConfig set consul-specific options
-func WithConfig(c *api.Config) source.Option {
-	return func(o *source.Options) {
-		if o.Context == nil {
-			o.Context = context.Background()
-		}
-		o.Context = context.WithValue(o.Context, configKey{}, c)
+		o.Context = context.WithValue(o.Context, dialTimeoutKey{}, timeout)
 	}
 }

config/source/etcd/util.go

@@ -0,0 +1,89 @@
+package etcd
+
+import (
+	"strings"
+
+	"github.com/coreos/etcd/clientv3"
+	"github.com/coreos/etcd/mvcc/mvccpb"
+	"github.com/micro/go-micro/config/encoder"
+)
+
+func makeEvMap(e encoder.Encoder, data map[string]interface{}, kv []*clientv3.Event, stripPrefix string) map[string]interface{} {
+	if data == nil {
+		data = make(map[string]interface{})
+	}
+
+	for _, v := range kv {
+		switch mvccpb.Event_EventType(v.Type) {
+		case mvccpb.DELETE:
+			data = update(e, data, (*mvccpb.KeyValue)(v.Kv), "delete", stripPrefix)
+		default:
+			data = update(e, data, (*mvccpb.KeyValue)(v.Kv), "insert", stripPrefix)
+		}
+	}
+
+	return data
+}
+
+func makeMap(e encoder.Encoder, kv []*mvccpb.KeyValue, stripPrefix string) map[string]interface{} {
+	data := make(map[string]interface{})
+
+	for _, v := range kv {
+		data = update(e, data, v, "put", stripPrefix)
+	}
+
+	return data
+}
+
+func update(e encoder.Encoder, data map[string]interface{}, v *mvccpb.KeyValue, action, stripPrefix string) map[string]interface{} {
+	// remove prefix if non empty, and ensure leading / is removed as well
+	vkey := strings.TrimPrefix(strings.TrimPrefix(string(v.Key), stripPrefix), "/")
+	// split on prefix
+	haveSplit := strings.Contains(vkey, "/")
+	keys := strings.Split(vkey, "/")
+
+	var vals interface{}
+	e.Decode(v.Value, &vals)
+
+	if !haveSplit && len(keys) == 1 {
+		switch action {
+		case "delete":
+			data = make(map[string]interface{})
+		default:
+			v, ok := vals.(map[string]interface{})
+			if ok {
+				data = v
+			}
+		}
+		return data
+	}
+
+	// set data for first iteration
+	kvals := data
+	// iterate the keys and make maps
+	for i, k := range keys {
+		kval, ok := kvals[k].(map[string]interface{})
+		if !ok {
+			// create next map
+			kval = make(map[string]interface{})
+			// set it
+			kvals[k] = kval
+		}
+
+		// last key: write vals
+		if l := len(keys) - 1; i == l {
+			switch action {
+			case "delete":
+				delete(kvals, k)
+			default:
+				kvals[k] = vals
+			}
+			break
+		}
+
+		// set kvals for next iterator
+		kvals = kval
+	}
+
+	return data
+}

config/source/etcd/watcher.go

@@ -0,0 +1,113 @@
+package etcd
+
+import (
+	"context"
+	"errors"
+	"sync"
+	"time"
+
+	cetcd "github.com/coreos/etcd/clientv3"
+	"github.com/micro/go-micro/config/source"
+)
+
+type watcher struct {
+	opts        source.Options
+	name        string
+	stripPrefix string
+
+	sync.RWMutex
+	cs *source.ChangeSet
+
+	ch   chan *source.ChangeSet
+	exit chan bool
+}
+
+func newWatcher(key, strip string, wc cetcd.Watcher, cs *source.ChangeSet, opts source.Options) (source.Watcher, error) {
+	w := &watcher{
+		opts:        opts,
+		name:        "etcd",
+		stripPrefix: strip,
+		cs:          cs,
+		ch:          make(chan *source.ChangeSet),
+		exit:        make(chan bool),
+	}
+
+	ch := wc.Watch(context.Background(), key, cetcd.WithPrefix())
+
+	go w.run(wc, ch)
+
+	return w, nil
+}
+
+func (w *watcher) handle(evs []*cetcd.Event) {
+	w.RLock()
+	data := w.cs.Data
+	w.RUnlock()
+
+	var vals map[string]interface{}
+
+	// unpackage existing changeset
+	if err := w.opts.Encoder.Decode(data, &vals); err != nil {
+		return
+	}
+
+	// update base changeset
+	d := makeEvMap(w.opts.Encoder, vals, evs, w.stripPrefix)
+
+	// pack the changeset
+	b, err := w.opts.Encoder.Encode(d)
+	if err != nil {
+		return
+	}
+
+	// create new changeset
+	cs := &source.ChangeSet{
+		Timestamp: time.Now(),
+		Source:    w.name,
+		Data:      b,
+		Format:    w.opts.Encoder.String(),
+	}
+	cs.Checksum = cs.Sum()
+
+	// set base change set
+	w.Lock()
+	w.cs = cs
+	w.Unlock()
+
+	// send update
+	w.ch <- cs
+}
+
+func (w *watcher) run(wc cetcd.Watcher, ch cetcd.WatchChan) {
+	for {
+		select {
+		case rsp, ok := <-ch:
+			if !ok {
+				return
+			}
+			w.handle(rsp.Events)
+		case <-w.exit:
+			wc.Close()
+			return
+		}
+	}
+}
+
+func (w *watcher) Next() (*source.ChangeSet, error) {
+	select {
+	case cs := <-w.ch:
+		return cs, nil
+	case <-w.exit:
+		return nil, errors.New("watcher stopped")
+	}
+}
+
+func (w *watcher) Stop() error {
+	select {
+	case <-w.exit:
+		return nil
+	default:
+		close(w.exit)
+	}
+	return nil
+}

config/source/file/watcher.go

@@ -1,7 +1,8 @@
+//+build !linux
+
 package file
 
 import (
-	"errors"
 	"os"
 
 	"github.com/fsnotify/fsnotify"
@@ -34,7 +35,7 @@ func (w *watcher) Next() (*source.ChangeSet, error) {
 	// is it closed?
 	select {
 	case <-w.exit:
-		return nil, errors.New("watcher stopped")
+		return nil, source.ErrWatcherStopped
 	default:
 	}
 
@@ -57,7 +58,7 @@ func (w *watcher) Next() (*source.ChangeSet, error) {
 	case err := <-w.fw.Errors:
 		return nil, err
 	case <-w.exit:
-		return nil, errors.New("watcher stopped")
+		return nil, source.ErrWatcherStopped
 	}
 }
 

config/source/file/watcher_linux.go

@@ -0,0 +1,71 @@
+//+build linux
+
+package file
+
+import (
+	"os"
+
+	"github.com/fsnotify/fsnotify"
+	"github.com/micro/go-micro/config/source"
+)
+
+type watcher struct {
+	f *file
+
+	fw   *fsnotify.Watcher
+	exit chan bool
+}
+
+func newWatcher(f *file) (source.Watcher, error) {
+	fw, err := fsnotify.NewWatcher()
+	if err != nil {
+		return nil, err
+	}
+
+	fw.Add(f.path)
+
+	return &watcher{
+		f:    f,
+		fw:   fw,
+		exit: make(chan bool),
+	}, nil
+}
+
+func (w *watcher) Next() (*source.ChangeSet, error) {
+	// is it closed?
+	select {
+	case <-w.exit:
+		return nil, source.ErrWatcherStopped
+	default:
+	}
+
+	// try get the event
+	select {
+	case event, _ := <-w.fw.Events:
+		if event.Op == fsnotify.Rename {
+			// check existence of file, and add watch again
+			_, err := os.Stat(event.Name)
+			if err == nil || os.IsExist(err) {
+				w.fw.Add(event.Name)
+			}
+		}
+
+		c, err := w.f.Read()
+		if err != nil {
+			return nil, err
+		}
+
+		// add path again for the event bug of fsnotify
+		w.fw.Add(w.f.path)
+
+		return c, nil
+	case err := <-w.fw.Errors:
+		return nil, err
+	case <-w.exit:
+		return nil, source.ErrWatcherStopped
+	}
+}
+
+func (w *watcher) Stop() error {
+	return w.fw.Close()
+}

config/source/flag/README.md

@@ -42,6 +42,6 @@ Load the source into config
 // Create new config
 conf := config.NewConfig()
 
-// Load file source
+// Load flag source
 conf.Load(flagSource)
 ```

config/source/flag/flag_test.go

@@ -12,13 +12,14 @@ var (
 	dbpw   = flag.String("database-password", "", "db pw")
 )
 
-func init() {
+func initTestFlags() {
 	flag.Set("database-host", "localhost")
 	flag.Set("database-password", "some-password")
 	flag.Parse()
 }
 
 func TestFlagsrc_Read(t *testing.T) {
+	initTestFlags()
 	source := NewSource()
 	c, err := source.Read()
 	if err != nil {
@@ -46,6 +47,7 @@ func TestFlagsrc_Read(t *testing.T) {
 }
 
 func TestFlagsrc_ReadAll(t *testing.T) {
+	initTestFlags()
 	source := NewSource(IncludeUnset(true))
 	c, err := source.Read()
 	if err != nil {

config/source/memory/README.md

@@ -27,7 +27,7 @@ Specify source with data
 
 ```go
 memorySource := memory.NewSource(
-	memory.WithData(data),
+	memory.WithJSON(data),
 )
 ```
 
@@ -39,6 +39,6 @@ Load the source into config
 // Create new config
 conf := config.NewConfig()
 
-// Load file source
+// Load memory source
 conf.Load(memorySource)
 ```

config/source/memory/memory.go

@@ -18,6 +18,7 @@ type memory struct {
 func (s *memory) Read() (*source.ChangeSet, error) {
 	s.RLock()
 	cs := &source.ChangeSet{
+		Format:    s.ChangeSet.Format,
 		Timestamp: s.ChangeSet.Timestamp,
 		Data:      s.ChangeSet.Data,
 		Checksum:  s.ChangeSet.Checksum,

config/source/source.go

@@ -2,9 +2,15 @@
 package source
 
 import (
+	"errors"
 	"time"
 )
 
+var (
+	// ErrWatcherStopped is returned when source watcher has been stopped
+	ErrWatcherStopped = errors.New("watcher stopped")
+)
+
 // Source is the source from which config is loaded
 type Source interface {
 	Read() (*ChangeSet, error)

data/store/consul/consul.go

@@ -1,96 +0,0 @@
-// Package consul is a consul implementation of kv
-package consul
-
-import (
-	"fmt"
-	"net"
-
-	"github.com/hashicorp/consul/api"
-	"github.com/micro/go-micro/config/options"
-	"github.com/micro/go-micro/data/store"
-)
-
-type ckv struct {
-	options.Options
-	client *api.Client
-}
-
-func (c *ckv) Read(key string) (*store.Record, error) {
-	keyval, _, err := c.client.KV().Get(key, nil)
-	if err != nil {
-		return nil, err
-	}
-
-	if keyval == nil {
-		return nil, store.ErrNotFound
-	}
-
-	return &store.Record{
-		Key:   keyval.Key,
-		Value: keyval.Value,
-	}, nil
-}
-
-func (c *ckv) Delete(key string) error {
-	_, err := c.client.KV().Delete(key, nil)
-	return err
-}
-
-func (c *ckv) Write(record *store.Record) error {
-	_, err := c.client.KV().Put(&api.KVPair{
-		Key:   record.Key,
-		Value: record.Value,
-	}, nil)
-	return err
-}
-
-func (c *ckv) Dump() ([]*store.Record, error) {
-	keyval, _, err := c.client.KV().List("/", nil)
-	if err != nil {
-		return nil, err
-	}
-	if keyval == nil {
-		return nil, store.ErrNotFound
-	}
-	var vals []*store.Record
-	for _, keyv := range keyval {
-		vals = append(vals, &store.Record{
-			Key:   keyv.Key,
-			Value: keyv.Value,
-		})
-	}
-	return vals, nil
-}
-
-func (c *ckv) String() string {
-	return "consul"
-}
-
-func NewStore(opts ...options.Option) store.Store {
-	options := options.NewOptions(opts...)
-	config := api.DefaultConfig()
-
-	var nodes []string
-
-	if n, ok := options.Values().Get("store.nodes"); ok {
-		nodes = n.([]string)
-	}
-
-	// set host
-	if len(nodes) > 0 {
-		addr, port, err := net.SplitHostPort(nodes[0])
-		if ae, ok := err.(*net.AddrError); ok && ae.Err == "missing port in address" {
-			port = "8500"
-			config.Address = fmt.Sprintf("%s:%s", nodes[0], port)
-		} else if err == nil {
-			config.Address = fmt.Sprintf("%s:%s", addr, port)
-		}
-	}
-
-	client, _ := api.NewClient(config)
-
-	return &ckv{
-		Options: options,
-		client:  client,
-	}
-}

debug/handler/debug.go

@@ -0,0 +1,41 @@
+package handler
+
+import (
+	"context"
+	"runtime"
+	"time"
+
+	proto "github.com/micro/go-micro/debug/proto"
+)
+
+type Debug struct {
+	proto.DebugHandler
+	started int64
+}
+
+var (
+	DefaultHandler = newDebug()
+)
+
+func newDebug() *Debug {
+	return &Debug{
+		started: time.Now().Unix(),
+	}
+}
+
+func (d *Debug) Health(ctx context.Context, req *proto.HealthRequest, rsp *proto.HealthResponse) error {
+	rsp.Status = "ok"
+	return nil
+}
+
+func (d *Debug) Stats(ctx context.Context, req *proto.StatsRequest, rsp *proto.StatsResponse) error {
+	var mstat runtime.MemStats
+	runtime.ReadMemStats(&mstat)
+
+	rsp.Started = uint64(d.started)
+	rsp.Uptime = uint64(time.Now().Unix() - d.started)
+	rsp.Memory = mstat.Alloc
+	rsp.Gc = mstat.PauseTotalNs
+	rsp.Threads = uint64(runtime.NumGoroutine())
+	return nil
+}

debug/proto/debug.micro.go

@@ -0,0 +1,108 @@
+// Code generated by protoc-gen-micro. DO NOT EDIT.
+// source: micro/go-micro/debug/proto/debug.proto
+
+package debug
+
+import (
+	fmt "fmt"
+	proto "github.com/golang/protobuf/proto"
+	math "math"
+)
+
+import (
+	context "context"
+	client "github.com/micro/go-micro/client"
+	server "github.com/micro/go-micro/server"
+)
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ = proto.Marshal
+var _ = fmt.Errorf
+var _ = math.Inf
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the proto package it is being compiled against.
+// A compilation error at this line likely means your copy of the
+// proto package needs to be updated.
+const _ = proto.ProtoPackageIsVersion3 // please upgrade the proto package
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ context.Context
+var _ client.Option
+var _ server.Option
+
+// Client API for Debug service
+
+type DebugService interface {
+	Health(ctx context.Context, in *HealthRequest, opts ...client.CallOption) (*HealthResponse, error)
+	Stats(ctx context.Context, in *StatsRequest, opts ...client.CallOption) (*StatsResponse, error)
+}
+
+type debugService struct {
+	c    client.Client
+	name string
+}
+
+func NewDebugService(name string, c client.Client) DebugService {
+	if c == nil {
+		c = client.NewClient()
+	}
+	if len(name) == 0 {
+		name = "debug"
+	}
+	return &debugService{
+		c:    c,
+		name: name,
+	}
+}
+
+func (c *debugService) Health(ctx context.Context, in *HealthRequest, opts ...client.CallOption) (*HealthResponse, error) {
+	req := c.c.NewRequest(c.name, "Debug.Health", in)
+	out := new(HealthResponse)
+	err := c.c.Call(ctx, req, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *debugService) Stats(ctx context.Context, in *StatsRequest, opts ...client.CallOption) (*StatsResponse, error) {
+	req := c.c.NewRequest(c.name, "Debug.Stats", in)
+	out := new(StatsResponse)
+	err := c.c.Call(ctx, req, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// Server API for Debug service
+
+type DebugHandler interface {
+	Health(context.Context, *HealthRequest, *HealthResponse) error
+	Stats(context.Context, *StatsRequest, *StatsResponse) error
+}
+
+func RegisterDebugHandler(s server.Server, hdlr DebugHandler, opts ...server.HandlerOption) error {
+	type debug interface {
+		Health(ctx context.Context, in *HealthRequest, out *HealthResponse) error
+		Stats(ctx context.Context, in *StatsRequest, out *StatsResponse) error
+	}
+	type Debug struct {
+		debug
+	}
+	h := &debugHandler{hdlr}
+	return s.Handle(s.NewHandler(&Debug{h}, opts...))
+}
+
+type debugHandler struct {
+	DebugHandler
+}
+
+func (h *debugHandler) Health(ctx context.Context, in *HealthRequest, out *HealthResponse) error {
+	return h.DebugHandler.Health(ctx, in, out)
+}
+
+func (h *debugHandler) Stats(ctx context.Context, in *StatsRequest, out *StatsResponse) error {
+	return h.DebugHandler.Stats(ctx, in, out)
+}

debug/proto/debug.pb.go

@@ -0,0 +1,336 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// source: micro/go-micro/debug/proto/debug.proto
+
+package debug
+
+import (
+	context "context"
+	fmt "fmt"
+	proto "github.com/golang/protobuf/proto"
+	grpc "google.golang.org/grpc"
+	math "math"
+)
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ = proto.Marshal
+var _ = fmt.Errorf
+var _ = math.Inf
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the proto package it is being compiled against.
+// A compilation error at this line likely means your copy of the
+// proto package needs to be updated.
+const _ = proto.ProtoPackageIsVersion3 // please upgrade the proto package
+
+type HealthRequest struct {
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *HealthRequest) Reset()         { *m = HealthRequest{} }
+func (m *HealthRequest) String() string { return proto.CompactTextString(m) }
+func (*HealthRequest) ProtoMessage()    {}
+func (*HealthRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_f25415e61bccfa1f, []int{0}
+}
+
+func (m *HealthRequest) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_HealthRequest.Unmarshal(m, b)
+}
+func (m *HealthRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_HealthRequest.Marshal(b, m, deterministic)
+}
+func (m *HealthRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_HealthRequest.Merge(m, src)
+}
+func (m *HealthRequest) XXX_Size() int {
+	return xxx_messageInfo_HealthRequest.Size(m)
+}
+func (m *HealthRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_HealthRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_HealthRequest proto.InternalMessageInfo
+
+type HealthResponse struct {
+	// default: ok
+	Status               string   `protobuf:"bytes,1,opt,name=status,proto3" json:"status,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *HealthResponse) Reset()         { *m = HealthResponse{} }
+func (m *HealthResponse) String() string { return proto.CompactTextString(m) }
+func (*HealthResponse) ProtoMessage()    {}
+func (*HealthResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_f25415e61bccfa1f, []int{1}
+}
+
+func (m *HealthResponse) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_HealthResponse.Unmarshal(m, b)
+}
+func (m *HealthResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_HealthResponse.Marshal(b, m, deterministic)
+}
+func (m *HealthResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_HealthResponse.Merge(m, src)
+}
+func (m *HealthResponse) XXX_Size() int {
+	return xxx_messageInfo_HealthResponse.Size(m)
+}
+func (m *HealthResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_HealthResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_HealthResponse proto.InternalMessageInfo
+
+func (m *HealthResponse) GetStatus() string {
+	if m != nil {
+		return m.Status
+	}
+	return ""
+}
+
+type StatsRequest struct {
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *StatsRequest) Reset()         { *m = StatsRequest{} }
+func (m *StatsRequest) String() string { return proto.CompactTextString(m) }
+func (*StatsRequest) ProtoMessage()    {}
+func (*StatsRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_f25415e61bccfa1f, []int{2}
+}
+
+func (m *StatsRequest) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_StatsRequest.Unmarshal(m, b)
+}
+func (m *StatsRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_StatsRequest.Marshal(b, m, deterministic)
+}
+func (m *StatsRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_StatsRequest.Merge(m, src)
+}
+func (m *StatsRequest) XXX_Size() int {
+	return xxx_messageInfo_StatsRequest.Size(m)
+}
+func (m *StatsRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_StatsRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_StatsRequest proto.InternalMessageInfo
+
+type StatsResponse struct {
+	// unix timestamp
+	Started uint64 `protobuf:"varint,1,opt,name=started,proto3" json:"started,omitempty"`
+	// in seconds
+	Uptime uint64 `protobuf:"varint,2,opt,name=uptime,proto3" json:"uptime,omitempty"`
+	// in bytes
+	Memory uint64 `protobuf:"varint,3,opt,name=memory,proto3" json:"memory,omitempty"`
+	// num threads
+	Threads uint64 `protobuf:"varint,4,opt,name=threads,proto3" json:"threads,omitempty"`
+	// total gc in nanoseconds
+	Gc                   uint64   `protobuf:"varint,5,opt,name=gc,proto3" json:"gc,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *StatsResponse) Reset()         { *m = StatsResponse{} }
+func (m *StatsResponse) String() string { return proto.CompactTextString(m) }
+func (*StatsResponse) ProtoMessage()    {}
+func (*StatsResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_f25415e61bccfa1f, []int{3}
+}
+
+func (m *StatsResponse) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_StatsResponse.Unmarshal(m, b)
+}
+func (m *StatsResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_StatsResponse.Marshal(b, m, deterministic)
+}
+func (m *StatsResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_StatsResponse.Merge(m, src)
+}
+func (m *StatsResponse) XXX_Size() int {
+	return xxx_messageInfo_StatsResponse.Size(m)
+}
+func (m *StatsResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_StatsResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_StatsResponse proto.InternalMessageInfo
+
+func (m *StatsResponse) GetStarted() uint64 {
+	if m != nil {
+		return m.Started
+	}
+	return 0
+}
+
+func (m *StatsResponse) GetUptime() uint64 {
+	if m != nil {
+		return m.Uptime
+	}
+	return 0
+}
+
+func (m *StatsResponse) GetMemory() uint64 {
+	if m != nil {
+		return m.Memory
+	}
+	return 0
+}
+
+func (m *StatsResponse) GetThreads() uint64 {
+	if m != nil {
+		return m.Threads
+	}
+	return 0
+}
+
+func (m *StatsResponse) GetGc() uint64 {
+	if m != nil {
+		return m.Gc
+	}
+	return 0
+}
+
+func init() {
+	proto.RegisterType((*HealthRequest)(nil), "HealthRequest")
+	proto.RegisterType((*HealthResponse)(nil), "HealthResponse")
+	proto.RegisterType((*StatsRequest)(nil), "StatsRequest")
+	proto.RegisterType((*StatsResponse)(nil), "StatsResponse")
+}
+
+func init() {
+	proto.RegisterFile("micro/go-micro/debug/proto/debug.proto", fileDescriptor_f25415e61bccfa1f)
+}
+
+var fileDescriptor_f25415e61bccfa1f = []byte{
+	// 230 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x54, 0x90, 0x41, 0x4b, 0xc4, 0x30,
+	0x10, 0x85, 0xb7, 0x75, 0x5b, 0x71, 0xb0, 0x59, 0xc8, 0x41, 0xc2, 0x9e, 0x24, 0x07, 0x29, 0x88,
+	0x59, 0xd0, 0xbf, 0xe0, 0xc1, 0x73, 0xbd, 0x0b, 0xd9, 0x76, 0xe8, 0x16, 0xac, 0xa9, 0x99, 0xe9,
+	0xc1, 0xb3, 0x7f, 0x5c, 0x9a, 0xa4, 0x60, 0x6f, 0xef, 0xbd, 0xf0, 0x1e, 0xf9, 0x06, 0x1e, 0xc6,
+	0xa1, 0xf5, 0xee, 0xd4, 0xbb, 0xa7, 0x28, 0x3a, 0x3c, 0xcf, 0xfd, 0x69, 0xf2, 0x8e, 0x93, 0x36,
+	0x41, 0xeb, 0x03, 0x54, 0x6f, 0x68, 0x3f, 0xf9, 0xd2, 0xe0, 0xf7, 0x8c, 0xc4, 0xba, 0x06, 0xb1,
+	0x06, 0x34, 0xb9, 0x2f, 0x42, 0x79, 0x07, 0x25, 0xb1, 0xe5, 0x99, 0x54, 0x76, 0x9f, 0xd5, 0x37,
+	0x4d, 0x72, 0x5a, 0xc0, 0xed, 0x3b, 0x5b, 0xa6, 0xb5, 0xf9, 0x9b, 0x41, 0x95, 0x82, 0xd4, 0x54,
+	0x70, 0x4d, 0x6c, 0x3d, 0x63, 0x17, 0xaa, 0xfb, 0x66, 0xb5, 0xcb, 0xe6, 0x3c, 0xf1, 0x30, 0xa2,
+	0xca, 0xc3, 0x43, 0x72, 0x4b, 0x3e, 0xe2, 0xe8, 0xfc, 0x8f, 0xba, 0x8a, 0x79, 0x74, 0xcb, 0x12,
+	0x5f, 0x3c, 0xda, 0x8e, 0xd4, 0x3e, 0x2e, 0x25, 0x2b, 0x05, 0xe4, 0x7d, 0xab, 0x8a, 0x10, 0xe6,
+	0x7d, 0xfb, 0xfc, 0x01, 0xc5, 0xeb, 0xc2, 0x27, 0x1f, 0xa1, 0x8c, 0x20, 0x52, 0x98, 0x0d, 0xe2,
+	0xf1, 0x60, 0xb6, 0x84, 0x7a, 0x27, 0x6b, 0x28, 0xc2, 0xd7, 0x65, 0x65, 0xfe, 0x33, 0x1d, 0x85,
+	0xd9, 0x10, 0xe9, 0xdd, 0xb9, 0x0c, 0x77, 0x7b, 0xf9, 0x0b, 0x00, 0x00, 0xff, 0xff, 0xfe, 0xb9,
+	0x5f, 0xf7, 0x61, 0x01, 0x00, 0x00,
+}
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ context.Context
+var _ grpc.ClientConn
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+const _ = grpc.SupportPackageIsVersion4
+
+// DebugClient is the client API for Debug service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://godoc.org/google.golang.org/grpc#ClientConn.NewStream.
+type DebugClient interface {
+	Health(ctx context.Context, in *HealthRequest, opts ...grpc.CallOption) (*HealthResponse, error)
+	Stats(ctx context.Context, in *StatsRequest, opts ...grpc.CallOption) (*StatsResponse, error)
+}
+
+type debugClient struct {
+	cc *grpc.ClientConn
+}
+
+func NewDebugClient(cc *grpc.ClientConn) DebugClient {
+	return &debugClient{cc}
+}
+
+func (c *debugClient) Health(ctx context.Context, in *HealthRequest, opts ...grpc.CallOption) (*HealthResponse, error) {
+	out := new(HealthResponse)
+	err := c.cc.Invoke(ctx, "/Debug/Health", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *debugClient) Stats(ctx context.Context, in *StatsRequest, opts ...grpc.CallOption) (*StatsResponse, error) {
+	out := new(StatsResponse)
+	err := c.cc.Invoke(ctx, "/Debug/Stats", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// DebugServer is the server API for Debug service.
+type DebugServer interface {
+	Health(context.Context, *HealthRequest) (*HealthResponse, error)
+	Stats(context.Context, *StatsRequest) (*StatsResponse, error)
+}
+
+func RegisterDebugServer(s *grpc.Server, srv DebugServer) {
+	s.RegisterService(&_Debug_serviceDesc, srv)
+}
+
+func _Debug_Health_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(HealthRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(DebugServer).Health(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/Debug/Health",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(DebugServer).Health(ctx, req.(*HealthRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _Debug_Stats_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(StatsRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(DebugServer).Stats(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/Debug/Stats",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(DebugServer).Stats(ctx, req.(*StatsRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+var _Debug_serviceDesc = grpc.ServiceDesc{
+	ServiceName: "Debug",
+	HandlerType: (*DebugServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "Health",
+			Handler:    _Debug_Health_Handler,
+		},
+		{
+			MethodName: "Stats",
+			Handler:    _Debug_Stats_Handler,
+		},
+	},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: "micro/go-micro/debug/proto/debug.proto",
+}

debug/proto/debug.proto

@@ -1,13 +1,9 @@
 syntax = "proto3";
 
-// This is commented out due to import cycles.
-// But its what we expect the RPC service to 
-// return.
-//
-// service Debug {
-// 	rpc Health(HealthRequest) returns (HealthResponse) {}
-// 	rpc Stats(StatsRequest) returns (StatsResponse) {}
-// }
+service Debug {
+ 	rpc Health(HealthRequest) returns (HealthResponse) {}
+ 	rpc Stats(StatsRequest) returns (StatsResponse) {}
+}
 
 message HealthRequest {
 }

function_test.go

@@ -5,8 +5,8 @@ import (
 	"sync"
 	"testing"
 
+	proto "github.com/micro/go-micro/debug/proto"
 	"github.com/micro/go-micro/registry/memory"
-	proto "github.com/micro/go-micro/server/debug/proto"
 )
 
 func TestFunction(t *testing.T) {

go.mod

@@ -1,84 +1,63 @@
 module github.com/micro/go-micro
 
-go 1.12
+go 1.13
 
 require (
-	cloud.google.com/go v0.41.0 // indirect
 	github.com/BurntSushi/toml v0.3.1
-	github.com/armon/circbuf v0.0.0-20190214190532-5111143e8da2 // indirect
-	github.com/armon/go-metrics v0.0.0-20190430140413-ec5e00d3c878 // indirect
-	github.com/armon/go-radix v1.0.0 // indirect
 	github.com/beevik/ntp v0.2.0
 	github.com/bitly/go-simplejson v0.5.0
+	github.com/bmizerany/assert v0.0.0-20160611221934-b7ed37b82869 // indirect
 	github.com/bwmarrin/discordgo v0.19.0
-	github.com/containerd/continuity v0.0.0-20190426062206-aaeac12a7ffc // indirect
+	github.com/cloudflare/cloudflare-go v0.10.4
+	github.com/coreos/bbolt v1.3.3 // indirect
+	github.com/coreos/etcd v3.3.17+incompatible
+	github.com/coreos/go-semver v0.3.0 // indirect
+	github.com/coreos/go-systemd v0.0.0-20190719114852-fd7a80b32e1f // indirect
+	github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f // indirect
 	github.com/forestgiant/sliceutil v0.0.0-20160425183142-94783f95db6c
 	github.com/fsnotify/fsnotify v1.4.7
-	github.com/fsouza/go-dockerclient v1.4.1
+	github.com/fsouza/go-dockerclient v1.4.4
 	github.com/ghodss/yaml v1.0.0
-	github.com/gliderlabs/ssh v0.2.2 // indirect
-	github.com/go-kit/kit v0.9.0 // indirect
+	github.com/go-acme/lego/v3 v3.1.0
 	github.com/go-log/log v0.1.0
 	github.com/go-playground/locales v0.12.1 // indirect
 	github.com/go-playground/universal-translator v0.16.0 // indirect
+	github.com/go-telegram-bot-api/telegram-bot-api v4.6.4+incompatible // indirect
+	github.com/golang/groupcache v0.0.0-20191002201903-404acd9df4cc // indirect
 	github.com/golang/protobuf v1.3.2
 	github.com/google/uuid v1.1.1
-	github.com/gorilla/handlers v1.4.1
-	github.com/gorilla/mux v1.7.3 // indirect
-	github.com/gorilla/websocket v1.4.0
-	github.com/hashicorp/consul/api v1.1.0
-	github.com/hashicorp/go-immutable-radix v1.1.0 // indirect
-	github.com/hashicorp/go-msgpack v0.5.5 // indirect
-	github.com/hashicorp/go-retryablehttp v0.5.4 // indirect
-	github.com/hashicorp/go-rootcerts v1.0.1 // indirect
-	github.com/hashicorp/go-sockaddr v1.0.2 // indirect
-	github.com/hashicorp/go-version v1.2.0 // indirect
+	github.com/gorilla/handlers v1.4.2
+	github.com/gorilla/websocket v1.4.1
+	github.com/grpc-ecosystem/go-grpc-middleware v1.1.0 // indirect
+	github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0 // indirect
+	github.com/hashicorp/consul/api v1.2.0
 	github.com/hashicorp/hcl v1.0.0
-	github.com/hashicorp/mdns v1.0.1 // indirect
-	github.com/hashicorp/memberlist v0.1.4
-	github.com/hashicorp/serf v0.8.3 // indirect
-	github.com/imdario/mergo v0.3.7
+	github.com/imdario/mergo v0.3.8
+	github.com/jonboulle/clockwork v0.1.0 // indirect
 	github.com/joncalhoun/qson v0.0.0-20170526102502-8a9cab3a62b1
-	github.com/json-iterator/go v1.1.6
-	github.com/kevinburke/ssh_config v0.0.0-20190630040420-2e50c441276c // indirect
-	github.com/kisielk/errcheck v1.2.0 // indirect
-	github.com/konsorten/go-windows-terminal-sequences v1.0.2 // indirect
-	github.com/kr/pty v1.1.8 // indirect
+	github.com/json-iterator/go v1.1.7
 	github.com/leodido/go-urn v1.1.0 // indirect
-	github.com/lucas-clemente/quic-go v0.7.1-0.20190710050138-1441923ab031
-	github.com/mattn/go-colorable v0.1.2 // indirect
-	github.com/mattn/go-runewidth v0.0.4 // indirect
+	github.com/lucas-clemente/quic-go v0.12.1
+	github.com/mholt/certmagic v0.7.5
 	github.com/micro/cli v0.2.0
-	github.com/micro/mdns v0.1.1-0.20190729112526-ef68c9635478
-	github.com/miekg/dns v1.1.15 // indirect
-	github.com/mitchellh/gox v1.0.1 // indirect
+	github.com/micro/mdns v0.3.0
 	github.com/mitchellh/hashstructure v1.0.0
+	github.com/nats-io/nats-server/v2 v2.1.0 // indirect
 	github.com/nats-io/nats.go v1.8.1
-	github.com/nats-io/nkeys v0.1.0 // indirect
-	github.com/nlopes/slack v0.5.0
-	github.com/olekukonko/tablewriter v0.0.1
-	github.com/onsi/ginkgo v1.8.0 // indirect
-	github.com/onsi/gomega v1.5.0 // indirect
+	github.com/nlopes/slack v0.6.0
 	github.com/pkg/errors v0.8.1
-	github.com/posener/complete v1.2.1 // indirect
-	github.com/prometheus/common v0.6.0 // indirect
-	github.com/prometheus/procfs v0.0.3 // indirect
-	github.com/sirupsen/logrus v1.4.2 // indirect
-	github.com/stretchr/objx v0.2.0 // indirect
+	github.com/soheilhy/cmux v0.1.4 // indirect
 	github.com/technoweenie/multipartstreamer v1.0.1 // indirect
-	golang.org/x/crypto v0.0.0-20190701094942-4def268fd1a4
-	golang.org/x/exp v0.0.0-20190627132806-fd42eb6b336f // indirect
-	golang.org/x/image v0.0.0-20190703141733-d6a02ce849c9 // indirect
-	golang.org/x/mobile v0.0.0-20190711165009-e47acb2ca7f9 // indirect
-	golang.org/x/mod v0.1.0 // indirect
-	golang.org/x/net v0.0.0-20190628185345-da137c7871d7
-	golang.org/x/sys v0.0.0-20190710143415-6ec70d6a5542 // indirect
-	golang.org/x/tools v0.0.0-20190711191110-9a621aea19f8 // indirect
-	google.golang.org/genproto v0.0.0-20190708153700-3bdd9d9f5532 // indirect
-	google.golang.org/grpc v1.22.0
-	gopkg.in/go-playground/validator.v9 v9.29.0
-	gopkg.in/src-d/go-billy.v4 v4.3.1 // indirect
-	gopkg.in/src-d/go-git.v4 v4.12.0
+	github.com/tmc/grpc-websocket-proxy v0.0.0-20190109142713-0ad062ec5ee5 // indirect
+	github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2 // indirect
+	go.etcd.io/bbolt v1.3.3 // indirect
+	go.uber.org/multierr v1.2.0 // indirect
+	golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550
+	golang.org/x/net v0.0.0-20191011234655-491137f69257
+	google.golang.org/grpc v1.24.0
+	gopkg.in/go-playground/assert.v1 v1.2.1 // indirect
+	gopkg.in/go-playground/validator.v9 v9.30.0
+	gopkg.in/src-d/go-git.v4 v4.13.1
 	gopkg.in/telegram-bot-api.v4 v4.6.4
-	honnef.co/go/tools v0.0.0-20190614002413-cb51c254f01b // indirect
+	sigs.k8s.io/yaml v1.1.0 // indirect
 )

go.sum

@@ -1,73 +1,130 @@
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
-cloud.google.com/go v0.40.0/go.mod h1:Tk58MuI9rbLMKlAjeO/bDnteAx7tX2gJIXw4T5Jwlro=
-cloud.google.com/go v0.41.0/go.mod h1:OauMR7DV8fzvZIl2qg6rkaIhD/vmgk4iwEw/h6ercmg=
+contrib.go.opencensus.io/exporter/ocagent v0.4.12/go.mod h1:450APlNTSR6FrvC3CTRqYosuDstRB9un7SOx2k/9ckA=
+github.com/Azure/azure-sdk-for-go v32.4.0+incompatible/go.mod h1:9XXNKU+eRnpl9moKnB4QOLf1HestfXbmab5FXxiDBjc=
+github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78 h1:w+iIsaOQNcT7OZ575w+acHgRric5iCyQh+xv+KJ4HB8=
 github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78/go.mod h1:LmzpDX56iTiv29bbRTIsUNlaFfuhWRQBWjQdVyAevI8=
+github.com/Azure/go-autorest/autorest v0.1.0/go.mod h1:AKyIcETwSUFxIcs/Wnq/C+kwCtlEYGUVd7FPNb2slmg=
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 github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
-github.com/DataDog/datadog-go v2.2.0+incompatible/go.mod h1:LButxg5PwREeZtORoXG3tL4fMGNddJ+vMq1mwgfaqoQ=
-github.com/Microsoft/go-winio v0.4.12/go.mod h1:VhR8bwka0BXejwEJY73c50VrPtXAaKcyvVC4A4RozmA=
+github.com/Microsoft/go-winio v0.4.14 h1:+hMXMk01us9KgxGb7ftKQt2Xpf5hH/yky+TDA+qxleU=
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+github.com/Microsoft/hcsshim v0.8.6 h1:ZfF0+zZeYdzMIVMZHKtDKJvLHj76XCuVae/jNkjj0IA=
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+github.com/akamai/AkamaiOPEN-edgegrid-golang v0.9.0/go.mod h1:zpDJeKyp9ScW4NNrbdr+Eyxvry3ilGPewKoXw3XGN1k=
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 github.com/alcortesm/tgz v0.0.0-20161220082320-9c5fe88206d7/go.mod h1:6zEj6s6u/ghQa61ZWa/C2Aw3RkjiTBOix7dkqa1VLIs=
 github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
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+github.com/anmitsu/go-shlex v0.0.0-20161002113705-648efa622239 h1:kFOfPq6dUM1hTo4JG6LR5AXSUEsOjtdm0kw0FtQtMJA=
 github.com/anmitsu/go-shlex v0.0.0-20161002113705-648efa622239/go.mod h1:2FmKhYUyUczH0OGQWaF5ceTx0UBShxjsH6f8oGKYe2c=
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 github.com/armon/circbuf v0.0.0-20150827004946-bbbad097214e/go.mod h1:3U/XgcO3hCbHZ8TKRvWD2dDTCfh9M9ya+I9JpbB7O8o=
-github.com/armon/circbuf v0.0.0-20190214190532-5111143e8da2/go.mod h1:3U/XgcO3hCbHZ8TKRvWD2dDTCfh9M9ya+I9JpbB7O8o=
 github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da h1:8GUt8eRujhVEGZFFEjBj46YV4rDjvGrNxb0KMWYkL2I=
 github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da/go.mod h1:Q73ZrmVTwzkszR9V5SSuryQ31EELlFMUz1kKyl939pY=
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-github.com/armon/go-metrics v0.0.0-20190430140413-ec5e00d3c878/go.mod h1:3AMJUQhVx52RsWOnlkpikZr01T/yAVN2gn0861vByNg=
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 github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5/go.mod h1:wHh0iHkYZB8zMSxRWpUBQtwG5a7fFgvEO+odwuTv2gs=
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 github.com/beevik/ntp v0.2.0/go.mod h1:hIHWr+l3+/clUnF44zdK+CWW7fO8dR5cIylAQ76NRpg=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
 github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
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 github.com/bgentry/speakeasy v0.1.0/go.mod h1:+zsyZBPWlz7T6j88CTgSN5bM796AkVf0kBD4zp0CCIs=
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 github.com/bitly/go-simplejson v0.5.0/go.mod h1:cXHtHw4XUPsvGaxgjIAn8PhEWG9NfngEKAMDJEczWVA=
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 github.com/bwmarrin/discordgo v0.19.0/go.mod h1:O9S4p+ofTFwB02em7jkpkV8M3R0/PUVOwN61zSZ0r4Q=
+github.com/cenkalti/backoff/v3 v3.0.0 h1:ske+9nBpD9qZsTBoF41nW5L+AIuFBKMeze18XQ3eG1c=
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+github.com/census-instrumentation/opencensus-proto v0.2.0/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
 github.com/cheekybits/genny v1.0.0 h1:uGGa4nei+j20rOSeDeP5Of12XVm7TGUd4dJA9RDitfE=
 github.com/cheekybits/genny v1.0.0/go.mod h1:+tQajlRqAUrPI7DOSpB0XAqZYtQakVtB7wXkRAgjxjQ=
-github.com/circonus-labs/circonus-gometrics v2.3.1+incompatible/go.mod h1:nmEj6Dob7S7YxXgwXpfOuvO54S+tGdZdw9fuRZt25Ag=
-github.com/circonus-labs/circonusllhist v0.1.3/go.mod h1:kMXHVDlOchFAehlya5ePtbp5jckzBHf4XRpQvBOLI+I=
 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
+github.com/cloudflare/cloudflare-go v0.10.2 h1:VBodKICVPnwmDxstcW3biKcDSpFIfS/RELUXsZSBYK4=
+github.com/cloudflare/cloudflare-go v0.10.2/go.mod h1:qhVI5MKwBGhdNU89ZRz2plgYutcJ5PCekLxXn56w6SY=
+github.com/cloudflare/cloudflare-go v0.10.4 h1:7C1D9mtcNFZLCqmhkHK2BlwKKm9fi4cBqY6qpYtQv5E=
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 github.com/containerd/continuity v0.0.0-20181203112020-004b46473808 h1:4BX8f882bXEDKfWIf0wa8HRvpnBoPszJJXL+TVbBw4M=
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micro.go

@@ -14,11 +14,19 @@ type serviceKey struct{}
 // within go-micro. Its a convenience method for building
 // and initialising services.
 type Service interface {
+	// The service name
+	Name() string
+	// Init initialises options
 	Init(...Option)
+	// Options returns the current options
 	Options() Options
+	// Client is used to call services
 	Client() client.Client
+	// Server is for handling requests and events
 	Server() server.Server
+	// Run the service
 	Run() error
+	// The service implementation
 	String() string
 }
 

monitor/default.go

@@ -0,0 +1,338 @@
+package monitor
+
+import (
+	"context"
+	"errors"
+	"sync"
+	"time"
+
+	"github.com/micro/go-micro/client"
+	pb "github.com/micro/go-micro/debug/proto"
+	"github.com/micro/go-micro/registry"
+	"github.com/micro/go-micro/registry/cache"
+)
+
+type monitor struct {
+	options Options
+
+	exit     chan bool
+	registry cache.Cache
+	client   client.Client
+
+	sync.RWMutex
+	running  bool
+	services map[string]*Status
+}
+
+func (m *monitor) Check(service string) error {
+	status, err := m.check(service)
+	if err != nil {
+		return err
+	}
+	m.Lock()
+	m.services[service] = status
+	m.Unlock()
+
+	if status.Code != StatusRunning {
+		return errors.New(status.Info)
+	}
+
+	return nil
+}
+
+// check provides binary running/failed status.
+// In the event Debug.Health cannot be called on a service we reap the node.
+func (m *monitor) check(service string) (*Status, error) {
+	services, err := m.registry.GetService(service)
+	if err != nil {
+		return nil, err
+	}
+
+	// create debug client
+	debug := pb.NewDebugService(service, m.client)
+
+	var status *Status
+	var gerr error
+
+	// iterate through multiple versions of a service
+	for _, service := range services {
+		for _, node := range service.Nodes {
+			// TODO: checks that are not just RPC based
+			// TODO: better matching of the protocol
+			// TODO: maybe everything has to be a go-micro service?
+			if node.Metadata["server"] != m.client.String() {
+				continue
+			}
+			// check the transport matches
+			if node.Metadata["transport"] != m.client.Options().Transport.String() {
+				continue
+			}
+
+			rsp, err := debug.Health(
+				context.Background(),
+				// empty health request
+				&pb.HealthRequest{},
+				// call this specific node
+				client.WithAddress(node.Address),
+				// retry in the event of failure
+				client.WithRetries(3),
+			)
+			if err != nil {
+				// reap the dead node
+				m.registry.Deregister(&registry.Service{
+					Name:    service.Name,
+					Version: service.Version,
+					Nodes:   []*registry.Node{node},
+				})
+
+				// save the error
+				gerr = err
+				continue
+			}
+
+			// expecting ok response status
+			if rsp.Status != "ok" {
+				gerr = errors.New(rsp.Status)
+				continue
+			}
+
+			// no error set status
+			status = &Status{
+				Code: StatusRunning,
+				Info: "running",
+			}
+		}
+	}
+
+	// if we got the success case return it
+	if status != nil {
+		return status, nil
+	}
+
+	// if gerr is not nil return it
+	if gerr != nil {
+		return &Status{
+			Code:  StatusFailed,
+			Info:  "not running",
+			Error: gerr.Error(),
+		}, nil
+	}
+
+	// otherwise unknown status
+	return &Status{
+		Code: StatusUnknown,
+		Info: "unknown status",
+	}, nil
+}
+
+func (m *monitor) reap() {
+	services, err := m.registry.ListServices()
+	if err != nil {
+		return
+	}
+
+	serviceMap := make(map[string]bool)
+	for _, service := range services {
+		serviceMap[service.Name] = true
+	}
+
+	m.Lock()
+	defer m.Unlock()
+
+	// range over our watched services
+	for service, _ := range m.services {
+		// check if the service exists in the registry
+		if !serviceMap[service] {
+			// if not, delete it in our status map
+			delete(m.services, service)
+		}
+	}
+}
+
+func (m *monitor) run() {
+	// check the status every tick
+	t := time.NewTicker(time.Minute)
+	defer t.Stop()
+
+	// reap dead services
+	t2 := time.NewTicker(time.Hour)
+	defer t2.Stop()
+
+	// list the known services
+	services, _ := m.registry.ListServices()
+
+	// create a check chan of same length
+	check := make(chan string, len(services))
+
+	// front-load the services to watch
+	for _, service := range services {
+		check <- service.Name
+	}
+
+	for {
+		select {
+		// exit if we're told to
+		case <-m.exit:
+			return
+		// check a service when told to
+		case service := <-check:
+			// check the status
+			status, err := m.check(service)
+			if err != nil {
+				status = &Status{
+					Code: StatusUnknown,
+					Info: "unknown status",
+				}
+			}
+
+			// save the status
+			m.Lock()
+			m.services[service] = status
+			m.Unlock()
+		// on the tick interval get all services and issue a check
+		case <-t.C:
+			// create a list of services
+			serviceMap := make(map[string]bool)
+
+			m.RLock()
+			for service, _ := range m.services {
+				serviceMap[service] = true
+			}
+			m.RUnlock()
+
+			go func() {
+				// check the status of all watched services
+				for service, _ := range serviceMap {
+					select {
+					case <-m.exit:
+						return
+					case check <- service:
+					default:
+						// barf if we block
+					}
+				}
+
+				// list services
+				services, _ := m.registry.ListServices()
+
+				for _, service := range services {
+					// start watching the service
+					if ok := serviceMap[service.Name]; !ok {
+						m.Watch(service.Name)
+					}
+				}
+			}()
+		case <-t2.C:
+			// reap any dead/non-existent services
+			m.reap()
+		}
+	}
+}
+
+func (m *monitor) Reap(service string) error {
+	services, err := m.registry.GetService(service)
+	if err != nil {
+		return nil
+	}
+	m.Lock()
+	defer m.Unlock()
+	delete(m.services, service)
+	for _, service := range services {
+		m.registry.Deregister(service)
+	}
+	return nil
+}
+
+func (m *monitor) Status(service string) (Status, error) {
+	m.RLock()
+	defer m.RUnlock()
+	if status, ok := m.services[service]; ok {
+		return *status, nil
+	}
+	return Status{}, ErrNotWatching
+}
+
+func (m *monitor) Watch(service string) error {
+	m.Lock()
+	defer m.Unlock()
+
+	// check if we're watching
+	if _, ok := m.services[service]; ok {
+		return nil
+	}
+
+	// get the status
+	status, err := m.check(service)
+	if err != nil {
+		return err
+	}
+
+	// set the status
+	m.services[service] = status
+	return nil
+}
+
+func (m *monitor) Run() error {
+	m.Lock()
+	defer m.Unlock()
+
+	if m.running {
+		return nil
+	}
+
+	// reset the exit channel
+	m.exit = make(chan bool)
+	// setup a new cache
+	m.registry = cache.New(m.options.Registry)
+
+	// start running
+	go m.run()
+
+	// set to running
+	m.running = true
+
+	return nil
+}
+
+func (m *monitor) Stop() error {
+	m.Lock()
+	defer m.Unlock()
+
+	if !m.running {
+		return nil
+	}
+
+	select {
+	case <-m.exit:
+		return nil
+	default:
+		close(m.exit)
+		for s, _ := range m.services {
+			delete(m.services, s)
+		}
+		m.registry.Stop()
+		m.running = false
+		return nil
+	}
+
+	return nil
+}
+
+func newMonitor(opts ...Option) Monitor {
+	options := Options{
+		Client:   client.DefaultClient,
+		Registry: registry.DefaultRegistry,
+	}
+
+	for _, o := range opts {
+		o(&options)
+	}
+
+	return &monitor{
+		options:  options,
+		exit:     make(chan bool),
+		client:   options.Client,
+		registry: cache.New(options.Registry),
+		services: make(map[string]*Status),
+	}
+}

monitor/default_test.go

@@ -0,0 +1,37 @@
+package monitor
+
+import (
+	"testing"
+)
+
+func TestMonitor(t *testing.T) {
+	// create new monitor
+	m := NewMonitor()
+
+	if err := m.Run(); err != nil {
+		t.Fatalf("failed to stop monitor: %v", err)
+	}
+
+	services := []string{"foo", "bar", "baz"}
+
+	for _, service := range services {
+		_, err := m.Status(service)
+		if err == nil {
+			t.Fatal("expected status error for unknown service")
+		}
+
+		if err := m.Watch(service); err == nil {
+			t.Fatal("expected watch error for unknown service")
+		}
+
+		// TODO:
+		// 1. start a service
+		// 2. watch service
+		// 3. get service status
+	}
+
+	// stop monitor
+	if err := m.Stop(); err != nil {
+		t.Fatalf("failed to stop monitor: %v", err)
+	}
+}

monitor/monitor.go

@@ -0,0 +1,45 @@
+// Package monitor monitors service health
+package monitor
+
+import (
+	"errors"
+)
+
+const (
+	StatusUnknown StatusCode = iota
+	StatusRunning
+	StatusFailed
+)
+
+type StatusCode int
+
+// Monitor monitors a service and reaps dead instances
+type Monitor interface {
+	// Reap a service and stop monitoring
+	Reap(service string) error
+	// Check the status of the service now
+	Check(service string) error
+	// Status of the service
+	Status(service string) (Status, error)
+	// Watch starts watching the service
+	Watch(service string) error
+	// Run the monitor to watch all services
+	Run() error
+	// Stop monitoring
+	Stop() error
+}
+
+type Status struct {
+	Code  StatusCode
+	Info  string
+	Error string
+}
+
+var (
+	ErrNotWatching = errors.New("not watching")
+)
+
+// NewMonitor returns a new monitor
+func NewMonitor(opts ...Option) Monitor {
+	return newMonitor(opts...)
+}

monitor/options.go

@@ -0,0 +1,25 @@
+package monitor
+
+import (
+	"github.com/micro/go-micro/client"
+	"github.com/micro/go-micro/registry"
+)
+
+type Options struct {
+	Client   client.Client
+	Registry registry.Registry
+}
+
+type Option func(*Options)
+
+func Client(c client.Client) Option {
+	return func(o *Options) {
+		o.Client = c
+	}
+}
+
+func Registry(r registry.Registry) Option {
+	return func(o *Options) {
+		o.Registry = r
+	}
+}

network/default.go

@@ -0,0 +1,989 @@
+package network
+
+import (
+	"errors"
+	"fmt"
+	"hash/fnv"
+	"sync"
+	"time"
+
+	"github.com/golang/protobuf/proto"
+	"github.com/micro/go-micro/client"
+	rtr "github.com/micro/go-micro/client/selector/router"
+	pbNet "github.com/micro/go-micro/network/proto"
+	"github.com/micro/go-micro/network/resolver/dns"
+	"github.com/micro/go-micro/proxy"
+	"github.com/micro/go-micro/router"
+	pbRtr "github.com/micro/go-micro/router/proto"
+	"github.com/micro/go-micro/server"
+	"github.com/micro/go-micro/transport"
+	"github.com/micro/go-micro/tunnel"
+	tun "github.com/micro/go-micro/tunnel/transport"
+	"github.com/micro/go-micro/util/backoff"
+	"github.com/micro/go-micro/util/log"
+)
+
+var (
+	// NetworkChannel is the name of the tunnel channel for passing network messages
+	NetworkChannel = "network"
+	// ControlChannel is the name of the tunnel channel for passing control message
+	ControlChannel = "control"
+	// DefaultLink is default network link
+	DefaultLink = "network"
+	// MaxConnections is the max number of network client connections
+	MaxConnections = 3
+)
+
+var (
+	// ErrClientNotFound is returned when client for tunnel channel could not be found
+	ErrClientNotFound = errors.New("client not found")
+)
+
+// network implements Network interface
+type network struct {
+	// node is network node
+	*node
+	// options configure the network
+	options Options
+	// rtr is network router
+	router router.Router
+	// prx is network proxy
+	proxy proxy.Proxy
+	// tun is network tunnel
+	tunnel tunnel.Tunnel
+	// server is network server
+	server server.Server
+	// client is network client
+	client client.Client
+
+	// tunClient is a map of tunnel clients keyed over tunnel channel names
+	tunClient map[string]transport.Client
+
+	sync.RWMutex
+	// connected marks the network as connected
+	connected bool
+	// closed closes the network
+	closed chan bool
+}
+
+// newNetwork returns a new network node
+func newNetwork(opts ...Option) Network {
+	options := DefaultOptions()
+
+	for _, o := range opts {
+		o(&options)
+	}
+
+	// init tunnel address to the network bind address
+	options.Tunnel.Init(
+		tunnel.Address(options.Address),
+	)
+
+	// init router Id to the network id
+	options.Router.Init(
+		router.Id(options.Id),
+	)
+
+	// create tunnel client with tunnel transport
+	tunTransport := tun.NewTransport(
+		tun.WithTunnel(options.Tunnel),
+	)
+
+	// set the address to a hashed address
+	hasher := fnv.New64()
+	hasher.Write([]byte(options.Address + options.Id))
+	address := fmt.Sprintf("%d", hasher.Sum64())
+
+	// set the address to advertise
+	var advertise string
+	var peerAddress string
+
+	if len(options.Advertise) > 0 {
+		advertise = options.Advertise
+		peerAddress = options.Advertise
+	} else {
+		advertise = options.Address
+		peerAddress = address
+	}
+
+	// server is network server
+	server := server.NewServer(
+		server.Id(options.Id),
+		server.Address(peerAddress),
+		server.Advertise(advertise),
+		server.Name(options.Name),
+		server.Transport(tunTransport),
+	)
+
+	// client is network client
+	client := client.NewClient(
+		client.Transport(tunTransport),
+		client.Selector(
+			rtr.NewSelector(
+				rtr.WithRouter(options.Router),
+			),
+		),
+	)
+
+	network := &network{
+		node: &node{
+			id:      options.Id,
+			address: peerAddress,
+			peers:   make(map[string]*node),
+		},
+		options:   options,
+		router:    options.Router,
+		proxy:     options.Proxy,
+		tunnel:    options.Tunnel,
+		server:    server,
+		client:    client,
+		tunClient: make(map[string]transport.Client),
+	}
+
+	network.node.network = network
+
+	return network
+}
+
+func (n *network) Init(opts ...Option) error {
+	n.Lock()
+	defer n.Unlock()
+
+	// TODO: maybe only allow reinit of certain opts
+	for _, o := range opts {
+		o(&n.options)
+	}
+
+	return nil
+}
+
+// Options returns network options
+func (n *network) Options() Options {
+	n.RLock()
+	defer n.RUnlock()
+
+	options := n.options
+
+	return options
+}
+
+// Name returns network name
+func (n *network) Name() string {
+	return n.options.Name
+}
+
+// resolveNodes resolves network nodes to addresses
+func (n *network) resolveNodes() ([]string, error) {
+	// resolve the network address to network nodes
+	records, err := n.options.Resolver.Resolve(n.options.Name)
+
+	nodeMap := make(map[string]bool)
+
+	// collect network node addresses
+	var nodes []string
+	var i int
+
+	for _, record := range records {
+		if _, ok := nodeMap[record.Address]; ok {
+			continue
+		}
+
+		nodeMap[record.Address] = true
+		nodes = append(nodes, record.Address)
+
+		i++
+
+		// break once MaxConnection nodes has been reached
+		if i == MaxConnections {
+			break
+		}
+	}
+
+	// use the dns resolver to expand peers
+	dns := &dns.Resolver{}
+
+	// append seed nodes if we have them
+	for _, node := range n.options.Peers {
+		// resolve anything that looks like a host name
+		records, err := dns.Resolve(node)
+		if err != nil {
+			log.Debugf("Failed to resolve %v %v", node, err)
+			continue
+		}
+
+		// add to the node map
+		for _, record := range records {
+			if _, ok := nodeMap[record.Address]; !ok {
+				nodes = append(nodes, record.Address)
+			}
+		}
+	}
+
+	return nodes, err
+}
+
+// resolve continuously resolves network nodes and initializes network tunnel with resolved addresses
+func (n *network) resolve() {
+	resolve := time.NewTicker(ResolveTime)
+	defer resolve.Stop()
+
+	for {
+		select {
+		case <-n.closed:
+			return
+		case <-resolve.C:
+			nodes, err := n.resolveNodes()
+			if err != nil {
+				log.Debugf("Network failed to resolve nodes: %v", err)
+				continue
+			}
+			// initialize the tunnel
+			n.tunnel.Init(
+				tunnel.Nodes(nodes...),
+			)
+		}
+	}
+}
+
+// handleNetConn handles network announcement messages
+func (n *network) handleNetConn(sess tunnel.Session, msg chan *transport.Message) {
+	for {
+		m := new(transport.Message)
+		if err := sess.Recv(m); err != nil {
+			log.Debugf("Network tunnel [%s] receive error: %v", NetworkChannel, err)
+			if sessErr := sess.Close(); sessErr != nil {
+				log.Debugf("Network tunnel [%s] closing connection error: %v", sessErr)
+			}
+			return
+		}
+
+		select {
+		case msg <- m:
+		case <-n.closed:
+			return
+		}
+	}
+}
+
+// acceptNetConn accepts connections from NetworkChannel
+func (n *network) acceptNetConn(l tunnel.Listener, recv chan *transport.Message) {
+	var i int
+	for {
+		// accept a connection
+		conn, err := l.Accept()
+		if err != nil {
+			sleep := backoff.Do(i)
+			log.Debugf("Network tunnel [%s] accept error: %v, backing off for %v", ControlChannel, err, sleep)
+			time.Sleep(sleep)
+			if i > 5 {
+				i = 0
+			}
+			i++
+			continue
+		}
+
+		select {
+		case <-n.closed:
+			if err := conn.Close(); err != nil {
+				log.Debugf("Network tunnel [%s] failed to close connection: %v", NetworkChannel, err)
+			}
+			return
+		default:
+			// go handle NetworkChannel connection
+			go n.handleNetConn(conn, recv)
+		}
+	}
+}
+
+// processNetChan processes messages received on NetworkChannel
+func (n *network) processNetChan(listener tunnel.Listener) {
+	// receive network message queue
+	recv := make(chan *transport.Message, 128)
+
+	// accept NetworkChannel connections
+	go n.acceptNetConn(listener, recv)
+
+	for {
+		select {
+		case m := <-recv:
+			// switch on type of message and take action
+			switch m.Header["Micro-Method"] {
+			case "connect":
+				// mark the time the message has been received
+				now := time.Now()
+				pbNetConnect := &pbNet.Connect{}
+				if err := proto.Unmarshal(m.Body, pbNetConnect); err != nil {
+					log.Debugf("Network tunnel [%s] connect unmarshal error: %v", NetworkChannel, err)
+					continue
+				}
+				// don't process your own messages
+				if pbNetConnect.Node.Id == n.options.Id {
+					continue
+				}
+				log.Debugf("Network received connect message from: %s", pbNetConnect.Node.Id)
+				peer := &node{
+					id:       pbNetConnect.Node.Id,
+					address:  pbNetConnect.Node.Address,
+					peers:    make(map[string]*node),
+					lastSeen: now,
+				}
+				if err := n.node.AddPeer(peer); err == ErrPeerExists {
+					log.Debugf("Network peer exists, refreshing: %s", peer.id)
+					// update lastSeen time for the existing node
+					if err := n.RefreshPeer(peer.id, now); err != nil {
+						log.Debugf("Network failed refreshing peer %s: %v", peer.id, err)
+					}
+					continue
+				}
+				// get node peers down to MaxDepth encoded in protobuf
+				msg := PeersToProto(n.node, MaxDepth)
+				// advertise yourself to the network
+				if err := n.sendMsg("peer", msg, NetworkChannel); err != nil {
+					log.Debugf("Network failed to advertise peers: %v", err)
+				}
+				// advertise all the routes when a new node has connected
+				if err := n.router.Solicit(); err != nil {
+					log.Debugf("Network failed to solicit routes: %s", err)
+				}
+			case "peer":
+				// mark the time the message has been received
+				now := time.Now()
+				pbNetPeer := &pbNet.Peer{}
+				if err := proto.Unmarshal(m.Body, pbNetPeer); err != nil {
+					log.Debugf("Network tunnel [%s] peer unmarshal error: %v", NetworkChannel, err)
+					continue
+				}
+				// don't process your own messages
+				if pbNetPeer.Node.Id == n.options.Id {
+					continue
+				}
+				log.Debugf("Network received peer message from: %s %s", pbNetPeer.Node.Id, pbNetPeer.Node.Address)
+				peer := &node{
+					id:       pbNetPeer.Node.Id,
+					address:  pbNetPeer.Node.Address,
+					peers:    make(map[string]*node),
+					lastSeen: now,
+				}
+				if err := n.node.AddPeer(peer); err == nil {
+					// send a solicit message when discovering new peer
+					msg := &pbRtr.Solicit{
+						Id: n.options.Id,
+					}
+					if err := n.sendMsg("solicit", msg, ControlChannel); err != nil {
+						log.Debugf("Network failed to send solicit message: %s", err)
+					}
+					continue
+					// we're expecting any error to be ErrPeerExists
+				} else if err != ErrPeerExists {
+					log.Debugf("Network got error adding peer %v", err)
+					continue
+				}
+
+				log.Debugf("Network peer exists, refreshing: %s", pbNetPeer.Node.Id)
+				// update lastSeen time for the peer
+				if err := n.RefreshPeer(pbNetPeer.Node.Id, now); err != nil {
+					log.Debugf("Network failed refreshing peer %s: %v", pbNetPeer.Node.Id, err)
+				}
+
+				// NOTE: we don't unpack MaxDepth toplogy
+				peer = UnpackPeerTopology(pbNetPeer, now, MaxDepth-1)
+				log.Debugf("Network updating topology of node: %s", n.node.id)
+				if err := n.node.UpdatePeer(peer); err != nil {
+					log.Debugf("Network failed to update peers: %v", err)
+				}
+			case "close":
+				pbNetClose := &pbNet.Close{}
+				if err := proto.Unmarshal(m.Body, pbNetClose); err != nil {
+					log.Debugf("Network tunnel [%s] close unmarshal error: %v", NetworkChannel, err)
+					continue
+				}
+				// don't process your own messages
+				if pbNetClose.Node.Id == n.options.Id {
+					continue
+				}
+				log.Debugf("Network received close message from: %s", pbNetClose.Node.Id)
+				peer := &node{
+					id:      pbNetClose.Node.Id,
+					address: pbNetClose.Node.Address,
+				}
+				if err := n.DeletePeerNode(peer.id); err != nil {
+					log.Debugf("Network failed to delete node %s routes: %v", peer.id, err)
+				}
+				if err := n.prunePeerRoutes(peer); err != nil {
+					log.Debugf("Network failed pruning peer %s routes: %v", peer.id, err)
+				}
+			}
+		case <-n.closed:
+			return
+		}
+	}
+}
+
+// sendMsg sends a message to the tunnel channel
+func (n *network) sendMsg(method string, msg proto.Message, channel string) error {
+	body, err := proto.Marshal(msg)
+	if err != nil {
+		return err
+	}
+	// create transport message and chuck it down the pipe
+	m := transport.Message{
+		Header: map[string]string{
+			"Micro-Method": method,
+		},
+		Body: body,
+	}
+
+	// check if the channel client is initialized
+	n.RLock()
+	client, ok := n.tunClient[channel]
+	if !ok || client == nil {
+		n.RUnlock()
+		return ErrClientNotFound
+	}
+	n.RUnlock()
+
+	log.Debugf("Network sending %s message from: %s", method, n.options.Id)
+	if err := client.Send(&m); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// announce announces node peers to the network
+func (n *network) announce(client transport.Client) {
+	announce := time.NewTicker(AnnounceTime)
+	defer announce.Stop()
+
+	for {
+		select {
+		case <-n.closed:
+			return
+		case <-announce.C:
+			msg := PeersToProto(n.node, MaxDepth)
+			// advertise yourself to the network
+			if err := n.sendMsg("peer", msg, NetworkChannel); err != nil {
+				log.Debugf("Network failed to advertise peers: %v", err)
+				continue
+			}
+		}
+	}
+}
+
+// pruneRoutes prunes routes return by given query
+func (n *network) pruneRoutes(q ...router.QueryOption) error {
+	routes, err := n.router.Table().Query(q...)
+	if err != nil && err != router.ErrRouteNotFound {
+		return err
+	}
+
+	for _, route := range routes {
+		if err := n.router.Table().Delete(route); err != nil && err != router.ErrRouteNotFound {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// pruneNodeRoutes prunes routes that were either originated by or routable via given node
+func (n *network) prunePeerRoutes(peer *node) error {
+	// lookup all routes originated by router
+	q := []router.QueryOption{
+		router.QueryRouter(peer.id),
+	}
+	if err := n.pruneRoutes(q...); err != nil {
+		return err
+	}
+
+	// lookup all routes routable via gw
+	q = []router.QueryOption{
+		router.QueryGateway(peer.address),
+	}
+	if err := n.pruneRoutes(q...); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// prune deltes node peers that have not been seen for longer than PruneTime seconds
+// prune also removes all the routes either originated by or routable by the stale nodes
+func (n *network) prune() {
+	prune := time.NewTicker(PruneTime)
+	defer prune.Stop()
+
+	for {
+		select {
+		case <-n.closed:
+			return
+		case <-prune.C:
+			pruned := n.PruneStalePeerNodes(PruneTime)
+			for id, peer := range pruned {
+				log.Debugf("Network peer exceeded prune time: %s", id)
+				if err := n.prunePeerRoutes(peer); err != nil {
+					log.Debugf("Network failed pruning peer %s routes: %v", id, err)
+				}
+			}
+			// get a list of all routes
+			routes, err := n.options.Router.Table().List()
+			if err != nil {
+				log.Debugf("Network failed listing routes: %v", err)
+				continue
+			}
+			// collect all the router IDs in the routing table
+			routers := make(map[string]bool)
+			for _, route := range routes {
+				if _, ok := routers[route.Router]; !ok {
+					routers[route.Router] = true
+					// if the router is NOT in our peer graph, delete all routes originated by it
+					if peerNode := n.node.GetPeerNode(route.Router); peerNode == nil {
+						if err := n.pruneRoutes(router.QueryRouter(route.Router)); err != nil {
+							log.Debugf("Network failed deleting routes by %s: %v", route.Router, err)
+						}
+					}
+				}
+			}
+		}
+	}
+}
+
+// handleCtrlConn handles ControlChannel connections
+func (n *network) handleCtrlConn(sess tunnel.Session, msg chan *transport.Message) {
+	for {
+		m := new(transport.Message)
+		if err := sess.Recv(m); err != nil {
+			log.Debugf("Network tunnel advert receive error: %v", err)
+			return
+		}
+
+		select {
+		case msg <- m:
+		case <-n.closed:
+			return
+		}
+	}
+}
+
+// acceptCtrlConn accepts connections from ControlChannel
+func (n *network) acceptCtrlConn(l tunnel.Listener, recv chan *transport.Message) {
+	var i int
+	for {
+		// accept a connection
+		conn, err := l.Accept()
+		if err != nil {
+			sleep := backoff.Do(i)
+			log.Debugf("Network tunnel [%s] accept error: %v, backing off for %v", ControlChannel, err, sleep)
+			time.Sleep(sleep)
+			if i > 5 {
+				// reset the counter
+				i = 0
+			}
+			i++
+			continue
+		}
+
+		select {
+		case <-n.closed:
+			if err := conn.Close(); err != nil {
+				log.Debugf("Network tunnel [%s] failed to close connection: %v", ControlChannel, err)
+			}
+			return
+		default:
+			// go handle ControlChannel connection
+			go n.handleCtrlConn(conn, recv)
+		}
+	}
+}
+
+// setRouteMetric calculates metric of the route and updates it in place
+// - Local route metric is 1
+// - Routes with ID of adjacent nodes are 10
+// - Routes by peers of the advertiser are 100
+// - Routes beyond your neighbourhood are 1000
+func (n *network) setRouteMetric(route *router.Route) {
+	// we are the origin of the route
+	if route.Router == n.options.Id {
+		route.Metric = 1
+		return
+	}
+
+	// check if the route origin is our peer
+	if _, ok := n.peers[route.Router]; ok {
+		route.Metric = 10
+		return
+	}
+
+	// check if the route origin is the peer of our peer
+	for _, peer := range n.peers {
+		for id := range peer.peers {
+			if route.Router == id {
+				route.Metric = 100
+				return
+			}
+		}
+	}
+
+	// the origin of the route is beyond our neighbourhood
+	route.Metric = 1000
+}
+
+// processCtrlChan processes messages received on ControlChannel
+func (n *network) processCtrlChan(listener tunnel.Listener) {
+	// receive control message queue
+	recv := make(chan *transport.Message, 128)
+
+	// accept ControlChannel cconnections
+	go n.acceptCtrlConn(listener, recv)
+
+	for {
+		select {
+		case m := <-recv:
+			// switch on type of message and take action
+			switch m.Header["Micro-Method"] {
+			case "advert":
+				pbRtrAdvert := &pbRtr.Advert{}
+				if err := proto.Unmarshal(m.Body, pbRtrAdvert); err != nil {
+					log.Debugf("Network fail to unmarshal advert message: %v", err)
+					continue
+				}
+				// don't process your own messages
+				if pbRtrAdvert.Id == n.options.Id {
+					continue
+				}
+				log.Debugf("Network received advert message from: %s", pbRtrAdvert.Id)
+				// loookup advertising node in our peer topology
+				advertNode := n.node.GetPeerNode(pbRtrAdvert.Id)
+				if advertNode == nil {
+					// if we can't find the node in our topology (MaxDepth) we skipp prcessing adverts
+					log.Debugf("Network skipping advert message from unknown peer: %s", pbRtrAdvert.Id)
+					continue
+				}
+
+				var events []*router.Event
+				for _, event := range pbRtrAdvert.Events {
+					// we know the advertising node is not the origin of the route
+					if pbRtrAdvert.Id != event.Route.Router {
+						// if the origin router is not the advertising node peer
+						// we can't rule out potential routing loops so we bail here
+						if peer := advertNode.GetPeerNode(event.Route.Router); peer == nil {
+							log.Debugf("Network skipping advert message from peer: %s", pbRtrAdvert.Id)
+							continue
+						}
+					}
+					route := router.Route{
+						Service: event.Route.Service,
+						Address: event.Route.Address,
+						Gateway: event.Route.Gateway,
+						Network: event.Route.Network,
+						Router:  event.Route.Router,
+						Link:    event.Route.Link,
+						Metric:  int(event.Route.Metric),
+					}
+					// set the route metric
+					n.node.RLock()
+					n.setRouteMetric(&route)
+					n.node.RUnlock()
+					// throw away metric bigger than 1000
+					if route.Metric > 1000 {
+						log.Debugf("Network route metric %d dropping node: %s", route.Metric, route.Router)
+						continue
+					}
+					// create router event
+					e := &router.Event{
+						Type:      router.EventType(event.Type),
+						Timestamp: time.Unix(0, pbRtrAdvert.Timestamp),
+						Route:     route,
+					}
+					events = append(events, e)
+				}
+				// if no events are eligible for processing continue
+				if len(events) == 0 {
+					log.Debugf("Network no events to be processed by router: %s", n.options.Id)
+					continue
+				}
+				// create an advert and process it
+				advert := &router.Advert{
+					Id:        pbRtrAdvert.Id,
+					Type:      router.AdvertType(pbRtrAdvert.Type),
+					Timestamp: time.Unix(0, pbRtrAdvert.Timestamp),
+					TTL:       time.Duration(pbRtrAdvert.Ttl),
+					Events:    events,
+				}
+
+				log.Debugf("Network router %s processing advert: %s", n.Id(), advert.Id)
+				if err := n.router.Process(advert); err != nil {
+					log.Debugf("Network failed to process advert %s: %v", advert.Id, err)
+				}
+			case "solicit":
+				pbRtrSolicit := &pbRtr.Solicit{}
+				if err := proto.Unmarshal(m.Body, pbRtrSolicit); err != nil {
+					log.Debugf("Network fail to unmarshal solicit message: %v", err)
+					continue
+				}
+				log.Debugf("Network received solicit message from: %s", pbRtrSolicit.Id)
+				// ignore solicitation when requested by you
+				if pbRtrSolicit.Id == n.options.Id {
+					continue
+				}
+				log.Debugf("Network router flushing routes for: %s", pbRtrSolicit.Id)
+				// advertise all the routes when a new node has connected
+				if err := n.router.Solicit(); err != nil {
+					log.Debugf("Network failed to solicit routes: %s", err)
+				}
+			}
+		case <-n.closed:
+			return
+		}
+	}
+}
+
+// advertise advertises routes to the network
+func (n *network) advertise(advertChan <-chan *router.Advert) {
+	hasher := fnv.New64()
+	for {
+		select {
+		// process local adverts and randomly fire them at other nodes
+		case advert := <-advertChan:
+			// create a proto advert
+			var events []*pbRtr.Event
+			for _, event := range advert.Events {
+				// the routes service address
+				address := event.Route.Address
+
+				// only hash the address if we're advertising our own local routes
+				if event.Route.Router == advert.Id {
+					// hash the service before advertising it
+					hasher.Reset()
+					hasher.Write([]byte(event.Route.Address + n.node.id))
+					address = fmt.Sprintf("%d", hasher.Sum64())
+				}
+
+				// NOTE: we override Gateway, Link and Address here
+				// TODO: should we avoid overriding gateway?
+				route := &pbRtr.Route{
+					Service: event.Route.Service,
+					Address: address,
+					Gateway: n.node.Address(),
+					Network: event.Route.Network,
+					Router:  event.Route.Router,
+					Link:    DefaultLink,
+					Metric:  int64(event.Route.Metric),
+				}
+				e := &pbRtr.Event{
+					Type:      pbRtr.EventType(event.Type),
+					Timestamp: event.Timestamp.UnixNano(),
+					Route:     route,
+				}
+				events = append(events, e)
+			}
+			msg := &pbRtr.Advert{
+				Id:        advert.Id,
+				Type:      pbRtr.AdvertType(advert.Type),
+				Timestamp: advert.Timestamp.UnixNano(),
+				Events:    events,
+			}
+			if err := n.sendMsg("advert", msg, ControlChannel); err != nil {
+				log.Debugf("Network failed to advertise routes: %v", err)
+				continue
+			}
+		case <-n.closed:
+			return
+		}
+	}
+}
+
+func (n *network) sendConnect() {
+	// send connect message to NetworkChannel
+	// NOTE: in theory we could do this as soon as
+	// Dial to NetworkChannel succeeds, but instead
+	// we initialize all other node resources first
+	msg := &pbNet.Connect{
+		Node: &pbNet.Node{
+			Id:      n.node.id,
+			Address: n.node.address,
+		},
+	}
+	if err := n.sendMsg("connect", msg, NetworkChannel); err != nil {
+		log.Debugf("Network failed to send connect message: %s", err)
+	}
+}
+
+// Connect connects the network
+func (n *network) Connect() error {
+	n.Lock()
+
+	// try to resolve network nodes
+	nodes, err := n.resolveNodes()
+	if err != nil {
+		log.Debugf("Network failed to resolve nodes: %v", err)
+	}
+
+	// initialize the tunnel to resolved nodes
+	n.tunnel.Init(
+		tunnel.Nodes(nodes...),
+	)
+
+	// connect network tunnel
+	if err := n.tunnel.Connect(); err != nil {
+		n.Unlock()
+		return err
+	}
+
+	// return if already connected
+	if n.connected {
+		// unlock first
+		n.Unlock()
+		// send the connect message
+		n.sendConnect()
+		return nil
+	}
+
+	// set our internal node address
+	// if advertise address is not set
+	if len(n.options.Advertise) == 0 {
+		n.server.Init(server.Advertise(n.tunnel.Address()))
+	}
+
+	// dial into ControlChannel to send route adverts
+	ctrlClient, err := n.tunnel.Dial(ControlChannel, tunnel.DialMode(tunnel.Multicast))
+	if err != nil {
+		n.Unlock()
+		return err
+	}
+
+	n.tunClient[ControlChannel] = ctrlClient
+
+	// listen on ControlChannel
+	ctrlListener, err := n.tunnel.Listen(ControlChannel, tunnel.ListenMode(tunnel.Multicast))
+	if err != nil {
+		n.Unlock()
+		return err
+	}
+
+	// dial into NetworkChannel to send network messages
+	netClient, err := n.tunnel.Dial(NetworkChannel, tunnel.DialMode(tunnel.Multicast))
+	if err != nil {
+		n.Unlock()
+		return err
+	}
+
+	n.tunClient[NetworkChannel] = netClient
+
+	// listen on NetworkChannel
+	netListener, err := n.tunnel.Listen(NetworkChannel, tunnel.ListenMode(tunnel.Multicast))
+	if err != nil {
+		n.Unlock()
+		return err
+	}
+
+	// create closed channel
+	n.closed = make(chan bool)
+
+	// start the router
+	if err := n.options.Router.Start(); err != nil {
+		n.Unlock()
+		return err
+	}
+
+	// start advertising routes
+	advertChan, err := n.options.Router.Advertise()
+	if err != nil {
+		n.Unlock()
+		return err
+	}
+
+	// start the server
+	if err := n.server.Start(); err != nil {
+		n.Unlock()
+		return err
+	}
+	n.Unlock()
+
+	// send the connect message
+	n.sendConnect()
+
+	// go resolving network nodes
+	go n.resolve()
+	// broadcast peers
+	go n.announce(netClient)
+	// prune stale nodes
+	go n.prune()
+	// listen to network messages
+	go n.processNetChan(netListener)
+	// advertise service routes
+	go n.advertise(advertChan)
+	// accept and process routes
+	go n.processCtrlChan(ctrlListener)
+
+	n.Lock()
+	n.connected = true
+	n.Unlock()
+
+	return nil
+}
+
+func (n *network) close() error {
+	// stop the server
+	if err := n.server.Stop(); err != nil {
+		return err
+	}
+
+	// stop the router
+	if err := n.router.Stop(); err != nil {
+		return err
+	}
+
+	// close the tunnel
+	if err := n.tunnel.Close(); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// Close closes network connection
+func (n *network) Close() error {
+	n.Lock()
+
+	if !n.connected {
+		n.Unlock()
+		return nil
+	}
+
+	select {
+	case <-n.closed:
+		n.Unlock()
+		return nil
+	default:
+		// TODO: send close message to the network channel
+		close(n.closed)
+		// set connected to false
+		n.connected = false
+
+		// unlock the lock otherwise we'll deadlock sending the close
+		n.Unlock()
+
+		msg := &pbNet.Close{
+			Node: &pbNet.Node{
+				Id:      n.node.id,
+				Address: n.node.address,
+			},
+		}
+		if err := n.sendMsg("close", msg, NetworkChannel); err != nil {
+			log.Debugf("Network failed to send close message: %s", err)
+		}
+	}
+
+	return n.close()
+}
+
+// Client returns network client
+func (n *network) Client() client.Client {
+	return n.client
+}
+
+// Server returns network server
+func (n *network) Server() server.Server {
+	return n.server
+}

network/link/default.go

@@ -1,288 +0,0 @@
-// Package link provides a measured transport.Socket link
-package link
-
-import (
-	"io"
-	"sync"
-	"time"
-
-	"github.com/micro/go-micro/config/options"
-	"github.com/micro/go-micro/transport"
-)
-
-type link struct {
-	sync.RWMutex
-
-	// the link id
-	id string
-
-	// the remote end to dial
-	addr string
-
-	// channel used to close the link
-	closed chan bool
-
-	// if its connected
-	connected bool
-
-	// the transport to use
-	transport transport.Transport
-
-	// the send queue to the socket
-	sendQueue chan *transport.Message
-	// the recv queue to the socket
-	recvQueue chan *transport.Message
-
-	// the socket for this link
-	socket transport.Socket
-
-	// determines the cost of the link
-	// based on queue length and roundtrip
-	length int
-	weight int
-}
-
-func newLink(options options.Options) *link {
-	// default values
-	var sock transport.Socket
-	var addr string
-	id := "local"
-	tr := transport.DefaultTransport
-
-	lid, ok := options.Values().Get("link.id")
-	if ok {
-		id = lid.(string)
-	}
-
-	laddr, ok := options.Values().Get("link.address")
-	if ok {
-		addr = laddr.(string)
-	}
-
-	ltr, ok := options.Values().Get("link.transport")
-	if ok {
-		tr = ltr.(transport.Transport)
-	}
-
-	lsock, ok := options.Values().Get("link.socket")
-	if ok {
-		sock = lsock.(transport.Socket)
-	}
-
-	l := &link{
-		// the remote end to dial
-		addr: addr,
-		// transport to dial link
-		transport: tr,
-		// the socket to use
-		// this is nil if not specified
-		socket: sock,
-		// unique id assigned to the link
-		id: id,
-		// the closed channel used to close the conn
-		closed: make(chan bool),
-		// then send queue
-		sendQueue: make(chan *transport.Message, 128),
-		// the receive queue
-		recvQueue: make(chan *transport.Message, 128),
-	}
-
-	// return the link
-	return l
-}
-
-// link methods
-
-// process processes messages on the send and receive queues.
-func (l *link) process() {
-	go func() {
-		for {
-			m := new(transport.Message)
-			if err := l.recv(m); err != nil {
-				return
-			}
-
-			select {
-			case l.recvQueue <- m:
-			case <-l.closed:
-				return
-			}
-		}
-	}()
-
-	// messages sent
-	i := 0
-	length := 0
-
-	for {
-		select {
-		case m := <-l.sendQueue:
-			t := time.Now()
-
-			// send the message
-			if err := l.send(m); err != nil {
-				return
-			}
-
-			// get header size, body size and time taken
-			hl := len(m.Header)
-			bl := len(m.Body)
-			d := time.Since(t)
-
-			// don't calculate on empty messages
-			if hl == 0 && bl == 0 {
-				continue
-			}
-
-			// increment sent
-			i++
-
-			// time take to send some bits and bytes
-			td := float64(hl+bl) / float64(d.Nanoseconds())
-			// increase the scale
-			td += 1
-
-			// judge the length
-			length = int(td) / (length + int(td))
-
-			// every 10 messages update length
-			if (i % 10) == 1 {
-				// cost average the length
-				// save it
-				l.Lock()
-				l.length = length
-				l.Unlock()
-			}
-		case <-l.closed:
-			return
-		}
-	}
-}
-
-// send a message over the link
-func (l *link) send(m *transport.Message) error {
-	// TODO: measure time taken and calculate length/rate
-	// send via the transport socket
-	return l.socket.Send(m)
-}
-
-// recv a message on the link
-func (l *link) recv(m *transport.Message) error {
-	if m.Header == nil {
-		m.Header = make(map[string]string)
-	}
-	// receive the transport message
-	return l.socket.Recv(m)
-}
-
-// Connect attempts to connect to an address and sets the socket
-func (l *link) Connect() error {
-	l.Lock()
-	if l.connected {
-		l.Unlock()
-		return nil
-	}
-	defer l.Unlock()
-
-	// replace closed
-	l.closed = make(chan bool)
-
-	// assume existing socket
-	if len(l.addr) == 0 {
-		go l.process()
-		return nil
-	}
-
-	// dial the endpoint
-	c, err := l.transport.Dial(l.addr)
-	if err != nil {
-		return err
-	}
-
-	// set the socket
-	l.socket = c
-
-	// kick start the processing
-	go l.process()
-
-	return nil
-}
-
-// Close the link
-func (l *link) Close() error {
-	select {
-	case <-l.closed:
-		return nil
-	default:
-		close(l.closed)
-		l.Lock()
-		l.connected = false
-		l.Unlock()
-		return l.socket.Close()
-	}
-}
-
-// returns the node id
-func (l *link) Id() string {
-	l.RLock()
-	defer l.RUnlock()
-	return l.id
-}
-
-// the remote ip of the link
-func (l *link) Remote() string {
-	l.RLock()
-	defer l.RUnlock()
-	return l.socket.Remote()
-}
-
-// the local ip of the link
-func (l *link) Local() string {
-	l.RLock()
-	defer l.RUnlock()
-	return l.socket.Local()
-}
-
-// length/rate of the link
-func (l *link) Length() int {
-	l.RLock()
-	defer l.RUnlock()
-	return l.length
-}
-
-// weight checks the size of the queues
-func (l *link) Weight() int {
-	return len(l.sendQueue) + len(l.recvQueue)
-}
-
-// Accept accepts a message on the socket
-func (l *link) Recv(m *transport.Message) error {
-	select {
-	case <-l.closed:
-		return io.EOF
-	case rm := <-l.recvQueue:
-		*m = *rm
-		return nil
-	}
-	// never reach
-	return nil
-}
-
-// Send sends a message on the socket immediately
-func (l *link) Send(m *transport.Message) error {
-	select {
-	case <-l.closed:
-		return io.EOF
-	case l.sendQueue <- m:
-	}
-	return nil
-}
-
-func (l *link) Status() string {
-	select {
-	case <-l.closed:
-		return "closed"
-	default:
-		return "connected"
-	}
-}

network/link/link.go

@@ -1,60 +0,0 @@
-// Package link provides a measured link on top of a transport.Socket
-package link
-
-import (
-	"errors"
-
-	"github.com/micro/go-micro/config/options"
-	"github.com/micro/go-micro/transport"
-)
-
-// Link is a layer on top of a transport socket with the
-// buffering send and recv queue's with the ability to
-// measure the actual transport link and reconnect if
-// an address is specified.
-type Link interface {
-	// provides the transport.Socket interface
-	transport.Socket
-	// Connect connects the link. It must be called first
-	// if there's an expectation to create a new socket.
-	Connect() error
-	// Id of the link is "local" if not specified
-	Id() string
-	// Status of the link
-	Status() string
-	// Depth of the buffers
-	Weight() int
-	// Rate of the link
-	Length() int
-}
-
-var (
-	ErrLinkClosed = errors.New("link closed")
-)
-
-// NewLink creates a new link on top of a socket
-func NewLink(opts ...options.Option) Link {
-	return newLink(options.NewOptions(opts...))
-}
-
-// Sets the link id which otherwise defaults to "local"
-func Id(id string) options.Option {
-	return options.WithValue("link.id", id)
-}
-
-// The address to use for the link. Connect must be
-// called for this to be used, its otherwise unused.
-func Address(a string) options.Option {
-	return options.WithValue("link.address", a)
-}
-
-// The transport to use for the link where we
-// want to dial the connection first.
-func Transport(t transport.Transport) options.Option {
-	return options.WithValue("link.transport", t)
-}
-
-// Socket sets the socket to use instead of dialing.
-func Socket(s transport.Socket) options.Option {
-	return options.WithValue("link.socket", s)
-}

network/network.go

@@ -0,0 +1,60 @@
+// Package network is for creating internetworks
+package network
+
+import (
+	"time"
+
+	"github.com/micro/go-micro/client"
+	"github.com/micro/go-micro/server"
+)
+
+var (
+	// DefaultName is default network name
+	DefaultName = "go.micro"
+	// DefaultAddress is default network address
+	DefaultAddress = ":0"
+	// ResolveTime defines time interval to periodically resolve network nodes
+	ResolveTime = 1 * time.Minute
+	// AnnounceTime defines time interval to periodically announce node neighbours
+	AnnounceTime = 30 * time.Second
+	// PruneTime defines time interval to periodically check nodes that need to be pruned
+	// due to their not announcing their presence within this time interval
+	PruneTime = 90 * time.Second
+)
+
+// Node is network node
+type Node interface {
+	// Id is node id
+	Id() string
+	// Address is node bind address
+	Address() string
+	// Peers returns node peers
+	Peers() []Node
+	// Network is the network node is in
+	Network() Network
+}
+
+// Network is micro network
+type Network interface {
+	// Node is network node
+	Node
+	// Initialise options
+	Init(...Option) error
+	// Options returns the network options
+	Options() Options
+	// Name of the network
+	Name() string
+	// Connect starts the resolver and tunnel server
+	Connect() error
+	// Close stops the tunnel and resolving
+	Close() error
+	// Client is micro client
+	Client() client.Client
+	// Server is micro server
+	Server() server.Server
+}
+
+// NewNetwork returns a new network interface
+func NewNetwork(opts ...Option) Network {
+	return newNetwork(opts...)
+}

network/node.go

@@ -0,0 +1,380 @@
+package network
+
+import (
+	"container/list"
+	"errors"
+	"sync"
+	"time"
+
+	pb "github.com/micro/go-micro/network/proto"
+)
+
+var (
+	// MaxDepth defines max depth of peer topology
+	MaxDepth uint = 3
+)
+
+var (
+	// ErrPeerExists is returned when adding a peer which already exists
+	ErrPeerExists = errors.New("peer already exists")
+	// ErrPeerNotFound is returned when a peer could not be found in node topology
+	ErrPeerNotFound = errors.New("peer not found")
+)
+
+// node is network node
+type node struct {
+	sync.RWMutex
+	// id is node id
+	id string
+	// address is node address
+	address string
+	// peers are nodes with direct link to this node
+	peers map[string]*node
+	// network returns the node network
+	network Network
+	// lastSeen keeps track of node lifetime and updates
+	lastSeen time.Time
+}
+
+// Id is node ide
+func (n *node) Id() string {
+	return n.id
+}
+
+// Address returns node address
+func (n *node) Address() string {
+	return n.address
+}
+
+// Network returns node network
+func (n *node) Network() Network {
+	return n.network
+}
+
+// walk walks the node graph until some condition is met
+func (n *node) walk(until func(peer *node) bool, action func(parent, peer *node)) map[string]*node {
+	// track the visited nodes
+	visited := make(map[string]*node)
+	// queue of the nodes to visit
+	queue := list.New()
+
+	// push node to the back of queue
+	queue.PushBack(n)
+	// mark the node as visited
+	visited[n.id] = n
+
+	// keep iterating over the queue until its empty
+	for queue.Len() > 0 {
+		// pop the node from the front of the queue
+		qnode := queue.Front()
+		if until(qnode.Value.(*node)) {
+			return visited
+		}
+		// iterate through all of the node peers
+		// mark the visited nodes; enqueue the non-visted
+		for id, peer := range qnode.Value.(*node).peers {
+			if _, ok := visited[id]; !ok {
+				visited[id] = peer
+				action(qnode.Value.(*node), peer)
+				queue.PushBack(peer)
+			}
+		}
+		// remove the node from the queue
+		queue.Remove(qnode)
+	}
+
+	return visited
+}
+
+// AddPeer adds a new peer to node topology
+// It returns false if the peer already exists
+func (n *node) AddPeer(peer *node) error {
+	n.Lock()
+	defer n.Unlock()
+
+	if _, ok := n.peers[peer.id]; !ok {
+		n.peers[peer.id] = peer
+		return nil
+	}
+
+	return ErrPeerExists
+}
+
+// DeletePeer deletes a peer from node peers
+// It returns true if the peer has been deleted
+func (n *node) DeletePeer(id string) bool {
+	n.Lock()
+	defer n.Unlock()
+
+	delete(n.peers, id)
+
+	return true
+}
+
+// UpdatePeer updates a peer if it already exists
+// It returns error if the peer does not exist
+func (n *node) UpdatePeer(peer *node) error {
+	n.Lock()
+	defer n.Unlock()
+
+	if _, ok := n.peers[peer.id]; ok {
+		n.peers[peer.id] = peer
+		return nil
+	}
+
+	return ErrPeerNotFound
+}
+
+// RefreshPeer updates node timestamp
+// It returns false if the peer has not been found.
+func (n *node) RefreshPeer(id string, now time.Time) error {
+	n.Lock()
+	defer n.Unlock()
+
+	peer, ok := n.peers[id]
+	if !ok {
+		return ErrPeerNotFound
+	}
+
+	if peer.lastSeen.Before(now) {
+		peer.lastSeen = now
+	}
+
+	return nil
+}
+
+// Nodes returns a slice of all nodes in the whole node topology
+func (n *node) Nodes() []Node {
+	// we need to freeze the network graph here
+	// otherwise we might get inconsisten results
+	n.RLock()
+	defer n.RUnlock()
+
+	// NOTE: this should never be true
+	untilNoMorePeers := func(node *node) bool {
+		return node == nil
+	}
+	justWalk := func(parent, node *node) {}
+
+	visited := n.walk(untilNoMorePeers, justWalk)
+
+	var nodes []Node
+	// collect all the nodes and return them
+	for _, node := range visited {
+		nodes = append(nodes, node)
+	}
+
+	return nodes
+}
+
+// GetPeerNode returns a node from node MaxDepth topology
+// It returns nil if the peer was not found
+func (n *node) GetPeerNode(id string) *node {
+	// get node topology up to MaxDepth
+	top := n.Topology(MaxDepth)
+
+	untilFoundPeer := func(n *node) bool {
+		return n.id == id
+	}
+	justWalk := func(paent, node *node) {}
+
+	visited := top.walk(untilFoundPeer, justWalk)
+
+	peerNode, ok := visited[id]
+	if !ok {
+		return nil
+	}
+
+	return peerNode
+}
+
+// DeletePeerNode removes peer node from node topology
+func (n *node) DeletePeerNode(id string) error {
+	n.Lock()
+	defer n.Unlock()
+
+	untilNoMorePeers := func(node *node) bool {
+		return node == nil
+	}
+
+	deleted := make(map[string]*node)
+	deletePeer := func(parent, node *node) {
+		if node.id != n.id && node.id == id {
+			delete(parent.peers, node.id)
+			deleted[node.id] = node
+		}
+	}
+
+	n.walk(untilNoMorePeers, deletePeer)
+
+	if _, ok := deleted[id]; !ok {
+		return ErrPeerNotFound
+	}
+
+	return nil
+}
+
+// PruneStalePeerNodes prune the peers that have not been seen for longer than given time
+// It returns a map of the the nodes that got pruned
+func (n *node) PruneStalePeerNodes(pruneTime time.Duration) map[string]*node {
+	n.Lock()
+	defer n.Unlock()
+
+	untilNoMorePeers := func(node *node) bool {
+		return node == nil
+	}
+
+	pruned := make(map[string]*node)
+	pruneStalePeer := func(parent, node *node) {
+		if node.id != n.id && time.Since(node.lastSeen) > PruneTime {
+			delete(parent.peers, node.id)
+			pruned[node.id] = node
+		}
+	}
+
+	n.walk(untilNoMorePeers, pruneStalePeer)
+
+	return pruned
+}
+
+// getTopology traverses node graph and builds node topology
+// NOTE: this function is not thread safe
+func (n *node) getTopology(depth uint) *node {
+	// make a copy of yourself
+	node := &node{
+		id:       n.id,
+		address:  n.address,
+		peers:    make(map[string]*node),
+		network:  n.network,
+		lastSeen: n.lastSeen,
+	}
+
+	// return if we reach requested depth or we have no more peers
+	if depth == 0 || len(n.peers) == 0 {
+		return node
+	}
+
+	// decrement the depth
+	depth--
+
+	// iterate through our peers and update the node peers
+	for _, peer := range n.peers {
+		nodePeer := peer.getTopology(depth)
+		if _, ok := node.peers[nodePeer.id]; !ok {
+			node.peers[nodePeer.id] = nodePeer
+		}
+	}
+
+	return node
+}
+
+// Topology returns a copy of the node topology down to given depth
+// NOTE: the returned node is a node graph - not a single node
+func (n *node) Topology(depth uint) *node {
+	n.RLock()
+	defer n.RUnlock()
+
+	return n.getTopology(depth)
+}
+
+// Peers returns node peers up to MaxDepth
+func (n *node) Peers() []Node {
+	n.RLock()
+	defer n.RUnlock()
+
+	var peers []Node
+	for _, nodePeer := range n.peers {
+		peer := nodePeer.getTopology(MaxDepth)
+		peers = append(peers, peer)
+	}
+
+	return peers
+}
+
+// UnpackPeerTopology unpacks pb.Peer into node topology of given depth
+func UnpackPeerTopology(pbPeer *pb.Peer, lastSeen time.Time, depth uint) *node {
+	peerNode := &node{
+		id:       pbPeer.Node.Id,
+		address:  pbPeer.Node.Address,
+		peers:    make(map[string]*node),
+		lastSeen: lastSeen,
+	}
+
+	// return if have either reached the depth or have no more peers
+	if depth == 0 || len(pbPeer.Peers) == 0 {
+		return peerNode
+	}
+
+	// decrement the depth
+	depth--
+
+	peers := make(map[string]*node)
+	for _, pbPeer := range pbPeer.Peers {
+		peer := UnpackPeerTopology(pbPeer, lastSeen, depth)
+		peers[pbPeer.Node.Id] = peer
+	}
+
+	peerNode.peers = peers
+
+	return peerNode
+}
+
+func peerProtoTopology(peer Node, depth uint) *pb.Peer {
+	node := &pb.Node{
+		Id:      peer.Id(),
+		Address: peer.Address(),
+	}
+
+	// set the network name if network is not nil
+	if peer.Network() != nil {
+		node.Network = peer.Network().Name()
+	}
+
+	pbPeers := &pb.Peer{
+		Node:  node,
+		Peers: make([]*pb.Peer, 0),
+	}
+
+	// return if we reached the end of topology or depth
+	if depth == 0 || len(peer.Peers()) == 0 {
+		return pbPeers
+	}
+
+	// decrement the depth
+	depth--
+
+	// iterate through peers of peers aka pops
+	for _, pop := range peer.Peers() {
+		peer := peerProtoTopology(pop, depth)
+		pbPeers.Peers = append(pbPeers.Peers, peer)
+	}
+
+	return pbPeers
+}
+
+// PeersToProto returns node peers graph encoded into protobuf
+func PeersToProto(node Node, depth uint) *pb.Peer {
+	// network node aka root node
+	pbNode := &pb.Node{
+		Id:      node.Id(),
+		Address: node.Address(),
+	}
+
+	// set the network name if network is not nil
+	if node.Network() != nil {
+		pbNode.Network = node.Network().Name()
+	}
+
+	// we will build proto topology into this
+	pbPeers := &pb.Peer{
+		Node:  pbNode,
+		Peers: make([]*pb.Peer, 0),
+	}
+
+	for _, peer := range node.Peers() {
+		pbPeer := peerProtoTopology(peer, depth)
+		pbPeers.Peers = append(pbPeers.Peers, pbPeer)
+	}
+
+	return pbPeers
+}

network/node_test.go

@@ -0,0 +1,319 @@
+package network
+
+import (
+	"testing"
+	"time"
+
+	pb "github.com/micro/go-micro/network/proto"
+)
+
+var (
+	testNodeId        = "testNode"
+	testNodeAddress   = "testAddress"
+	testNodeNetName   = "testNetwork"
+	testNodePeerIds   = []string{"peer1", "peer2", "peer3"}
+	testPeerOfPeerIds = []string{"peer11", "peer12"}
+)
+
+func testSetup() *node {
+	testNode := &node{
+		id:      testNodeId,
+		address: testNodeAddress,
+		peers:   make(map[string]*node),
+		network: newNetwork(Name(testNodeNetName)),
+	}
+
+	// add some peers to the node
+	for _, id := range testNodePeerIds {
+		testNode.peers[id] = &node{
+			id:      id,
+			address: testNode.address + "-" + id,
+			peers:   make(map[string]*node),
+			network: testNode.network,
+		}
+	}
+
+	// add peers to peer1
+	// NOTE: these are peers of peers!
+	for _, id := range testPeerOfPeerIds {
+		testNode.peers["peer1"].peers[id] = &node{
+			id:      id,
+			address: testNode.address + "-" + id,
+			peers:   make(map[string]*node),
+			network: testNode.network,
+		}
+	}
+
+	// connect peer1 with peer2
+	testNode.peers["peer1"].peers["peer2"] = testNode.peers["peer2"]
+	// connect peer2 with peer3
+	testNode.peers["peer2"].peers["peer3"] = testNode.peers["peer3"]
+
+	return testNode
+}
+
+func TestNodeId(t *testing.T) {
+	node := testSetup()
+	if node.Id() != testNodeId {
+		t.Errorf("Expected id: %s, found: %s", testNodeId, node.Id())
+	}
+}
+
+func TestNodeAddress(t *testing.T) {
+	node := testSetup()
+	if node.Address() != testNodeAddress {
+		t.Errorf("Expected address: %s, found: %s", testNodeAddress, node.Address())
+	}
+}
+func TestNodeNetwork(t *testing.T) {
+	node := testSetup()
+	if node.Network().Name() != testNodeNetName {
+		t.Errorf("Expected network: %s, found: %s", testNodeNetName, node.Network().Name())
+	}
+}
+
+func TestNodes(t *testing.T) {
+	// single node
+	single := &node{
+		id:      testNodeId,
+		address: testNodeAddress,
+		peers:   make(map[string]*node),
+		network: newNetwork(Name(testNodeNetName)),
+	}
+	// get all the nodes including yourself
+	nodes := single.Nodes()
+	nodeCount := 1
+
+	if len(nodes) != nodeCount {
+		t.Errorf("Expected to find %d nodes, found: %d", nodeCount, len(nodes))
+	}
+
+	// complicated node graph
+	node := testSetup()
+	// get all the nodes including yourself
+	nodes = node.Nodes()
+
+	// compile a list of ids of all nodes in the network into map for easy indexing
+	nodeIds := make(map[string]bool)
+	// add yourself
+	nodeIds[node.id] = true
+	// add peer Ids
+	for _, id := range testNodePeerIds {
+		nodeIds[id] = true
+	}
+	// add peer1 peers i.e. peers of peer
+	for _, id := range testPeerOfPeerIds {
+		nodeIds[id] = true
+	}
+
+	// we should return the correct number of nodes
+	if len(nodes) != len(nodeIds) {
+		t.Errorf("Expected %d nodes, found: %d", len(nodeIds), len(nodes))
+	}
+
+	// iterate through the list of nodes and makes sure all have been returned
+	for _, node := range nodes {
+		if _, ok := nodeIds[node.Id()]; !ok {
+			t.Errorf("Expected to find %s node", node.Id())
+		}
+	}
+
+	// this is a leaf node
+	id := "peer11"
+	if nodePeer := node.GetPeerNode(id); nodePeer == nil {
+		t.Errorf("Expected to find %s node", id)
+	}
+}
+
+func collectPeerIds(peer Node, ids map[string]bool) map[string]bool {
+	if len(peer.Peers()) == 0 {
+		return ids
+	}
+
+	// iterate through the whole graph
+	for _, peer := range peer.Peers() {
+		ids = collectPeerIds(peer, ids)
+		if _, ok := ids[peer.Id()]; !ok {
+			ids[peer.Id()] = true
+		}
+	}
+
+	return ids
+}
+
+func TestPeers(t *testing.T) {
+	// single node
+	single := &node{
+		id:      testNodeId,
+		address: testNodeAddress,
+		peers:   make(map[string]*node),
+		network: newNetwork(Name(testNodeNetName)),
+	}
+	// get node peers
+	peers := single.Peers()
+	// there should be no peers
+	peerCount := 0
+
+	if len(peers) != peerCount {
+		t.Errorf("Expected to find %d nodes, found: %d", peerCount, len(peers))
+	}
+
+	// complicated node graph
+	node := testSetup()
+	// list of ids of nodes of MaxDepth
+	peerIds := make(map[string]bool)
+	// add peer Ids
+	for _, id := range testNodePeerIds {
+		peerIds[id] = true
+	}
+	// add peers of peers to peerIds
+	for _, id := range testPeerOfPeerIds {
+		peerIds[id] = true
+	}
+	// get node peers
+	peers = node.Peers()
+
+	// we will collect all returned Peer Ids into this map
+	resPeerIds := make(map[string]bool)
+	for _, peer := range peers {
+		resPeerIds[peer.Id()] = true
+		resPeerIds = collectPeerIds(peer, resPeerIds)
+	}
+
+	// if correct, we must collect all peerIds
+	if len(resPeerIds) != len(peerIds) {
+		t.Errorf("Expected to find %d peers, found: %d", len(peerIds), len(resPeerIds))
+	}
+
+	for id := range resPeerIds {
+		if _, ok := peerIds[id]; !ok {
+			t.Errorf("Expected to find %s peer", id)
+		}
+	}
+}
+
+func TestDeletePeerNode(t *testing.T) {
+	// complicated node graph
+	node := testSetup()
+
+	nodeCount := len(node.Nodes())
+
+	// should not find non-existent peer node
+	if err := node.DeletePeerNode("foobar"); err != ErrPeerNotFound {
+		t.Errorf("Expected: %v, got: %v", ErrPeerNotFound, err)
+	}
+
+	// lets pick one of the peer1 peers
+	if err := node.DeletePeerNode(testPeerOfPeerIds[0]); err != nil {
+		t.Errorf("Error deleting peer node: %v", err)
+	}
+
+	nodeDelCount := len(node.Nodes())
+
+	if nodeDelCount != nodeCount-1 {
+		t.Errorf("Expected node count: %d, got: %d", nodeCount-1, nodeDelCount)
+	}
+}
+
+func TestPruneStalePeerNodes(t *testing.T) {
+	// complicated node graph
+	node := testSetup()
+
+	nodes := node.Nodes()
+
+	pruneTime := 10 * time.Millisecond
+	time.Sleep(pruneTime)
+
+	// should delete all nodes besides node
+	pruned := node.PruneStalePeerNodes(pruneTime)
+
+	if len(pruned) != len(nodes)-1 {
+		t.Errorf("Expected pruned node count: %d, got: %d", len(nodes)-1, len(pruned))
+	}
+}
+
+func TestUnpackPeerTopology(t *testing.T) {
+	pbPeer := &pb.Peer{
+		Node: &pb.Node{
+			Id:      "newPeer",
+			Address: "newPeerAddress",
+		},
+		Peers: make([]*pb.Peer, 0),
+	}
+	// it should add pbPeer to the single node peers
+	peer := UnpackPeerTopology(pbPeer, time.Now(), 5)
+	if peer.id != pbPeer.Node.Id {
+		t.Errorf("Expected peer id %s, found: %s", pbPeer.Node.Id, peer.id)
+	}
+
+	node := testSetup()
+	// build a simple topology to update node peer1
+	peer1 := node.peers["peer1"]
+	pbPeer1Node := &pb.Node{
+		Id:      peer1.id,
+		Address: peer1.address,
+	}
+
+	pbPeer111 := &pb.Peer{
+		Node: &pb.Node{
+			Id:      "peer111",
+			Address: "peer111Address",
+		},
+		Peers: make([]*pb.Peer, 0),
+	}
+
+	pbPeer121 := &pb.Peer{
+		Node: &pb.Node{
+			Id:      "peer121",
+			Address: "peer121Address",
+		},
+		Peers: make([]*pb.Peer, 0),
+	}
+	// topology to update
+	pbPeer1 := &pb.Peer{
+		Node:  pbPeer1Node,
+		Peers: []*pb.Peer{pbPeer111, pbPeer121},
+	}
+	// unpack peer1 topology
+	peer = UnpackPeerTopology(pbPeer1, time.Now(), 5)
+	// make sure peer1 topology has been correctly updated
+	newPeerIds := []string{pbPeer111.Node.Id, pbPeer121.Node.Id}
+	for _, id := range newPeerIds {
+		if _, ok := peer.peers[id]; !ok {
+			t.Errorf("Expected %s to be a peer of %s", id, "peer1")
+		}
+	}
+}
+
+func TestPeersToProto(t *testing.T) {
+	// single node
+	single := &node{
+		id:      testNodeId,
+		address: testNodeAddress,
+		peers:   make(map[string]*node),
+		network: newNetwork(Name(testNodeNetName)),
+	}
+	topCount := 0
+
+	protoPeers := PeersToProto(single, 0)
+
+	if len(protoPeers.Peers) != topCount {
+		t.Errorf("Expected to find %d nodes, found: %d", topCount, len(protoPeers.Peers))
+	}
+
+	// complicated node graph
+	node := testSetup()
+	topCount = 3
+	// list of ids of nodes of depth 1 i.e. node peers
+	peerIds := make(map[string]bool)
+	// add peer Ids
+	for _, id := range testNodePeerIds {
+		peerIds[id] = true
+	}
+	// depth 1 should give us immmediate neighbours only
+	protoPeers = PeersToProto(node, 1)
+
+	if len(protoPeers.Peers) != topCount {
+		t.Errorf("Expected to find %d nodes, found: %d", topCount, len(protoPeers.Peers))
+	}
+}

network/options.go

@@ -0,0 +1,111 @@
+package network
+
+import (
+	"github.com/google/uuid"
+	"github.com/micro/go-micro/network/resolver"
+	"github.com/micro/go-micro/network/resolver/registry"
+	"github.com/micro/go-micro/proxy"
+	"github.com/micro/go-micro/proxy/mucp"
+	"github.com/micro/go-micro/router"
+	"github.com/micro/go-micro/tunnel"
+)
+
+type Option func(*Options)
+
+// Options configure network
+type Options struct {
+	// Id of the node
+	Id string
+	// Name of the network
+	Name string
+	// Address to bind to
+	Address string
+	// Advertise sets the address to advertise
+	Advertise string
+	// Peers is a list of peers to connect to
+	Peers []string
+	// Tunnel is network tunnel
+	Tunnel tunnel.Tunnel
+	// Router is network router
+	Router router.Router
+	// Proxy is network proxy
+	Proxy proxy.Proxy
+	// Resolver is network resolver
+	Resolver resolver.Resolver
+}
+
+// Id sets the id of the network node
+func Id(id string) Option {
+	return func(o *Options) {
+		o.Id = id
+	}
+}
+
+// Name sets the network name
+func Name(n string) Option {
+	return func(o *Options) {
+		o.Name = n
+	}
+}
+
+// Address sets the network address
+func Address(a string) Option {
+	return func(o *Options) {
+		o.Address = a
+	}
+}
+
+// Advertise sets the address to advertise
+func Advertise(a string) Option {
+	return func(o *Options) {
+		o.Advertise = a
+	}
+}
+
+// Peers is a list of peers to connect to
+func Peers(n ...string) Option {
+	return func(o *Options) {
+		o.Peers = n
+	}
+}
+
+// Tunnel sets the network tunnel
+func Tunnel(t tunnel.Tunnel) Option {
+	return func(o *Options) {
+		o.Tunnel = t
+	}
+}
+
+// Router sets the network router
+func Router(r router.Router) Option {
+	return func(o *Options) {
+		o.Router = r
+	}
+}
+
+// Proxy sets the network proxy
+func Proxy(p proxy.Proxy) Option {
+	return func(o *Options) {
+		o.Proxy = p
+	}
+}
+
+// Resolver is the network resolver
+func Resolver(r resolver.Resolver) Option {
+	return func(o *Options) {
+		o.Resolver = r
+	}
+}
+
+// DefaultOptions returns network default options
+func DefaultOptions() Options {
+	return Options{
+		Id:       uuid.New().String(),
+		Name:     DefaultName,
+		Address:  DefaultAddress,
+		Tunnel:   tunnel.NewTunnel(),
+		Router:   router.DefaultRouter,
+		Proxy:    mucp.NewProxy(),
+		Resolver: &registry.Resolver{},
+	}
+}

network/proto/network.micro.go

@@ -0,0 +1,170 @@
+// Code generated by protoc-gen-micro. DO NOT EDIT.
+// source: github.com/micro/go-micro/network/proto/network.proto
+
+package go_micro_network
+
+import (
+	fmt "fmt"
+	proto "github.com/golang/protobuf/proto"
+	_ "github.com/micro/go-micro/router/proto"
+	math "math"
+)
+
+import (
+	context "context"
+	client "github.com/micro/go-micro/client"
+	server "github.com/micro/go-micro/server"
+)
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ = proto.Marshal
+var _ = fmt.Errorf
+var _ = math.Inf
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the proto package it is being compiled against.
+// A compilation error at this line likely means your copy of the
+// proto package needs to be updated.
+const _ = proto.ProtoPackageIsVersion3 // please upgrade the proto package
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ context.Context
+var _ client.Option
+var _ server.Option
+
+// Client API for Network service
+
+type NetworkService interface {
+	// Connect to the network
+	Connect(ctx context.Context, in *ConnectRequest, opts ...client.CallOption) (*ConnectResponse, error)
+	// Returns the entire network graph
+	Graph(ctx context.Context, in *GraphRequest, opts ...client.CallOption) (*GraphResponse, error)
+	// Returns a list of known nodes in the network
+	Nodes(ctx context.Context, in *NodesRequest, opts ...client.CallOption) (*NodesResponse, error)
+	// Returns a list of known routes in the network
+	Routes(ctx context.Context, in *RoutesRequest, opts ...client.CallOption) (*RoutesResponse, error)
+	// Returns a list of known services based on routes
+	Services(ctx context.Context, in *ServicesRequest, opts ...client.CallOption) (*ServicesResponse, error)
+}
+
+type networkService struct {
+	c    client.Client
+	name string
+}
+
+func NewNetworkService(name string, c client.Client) NetworkService {
+	if c == nil {
+		c = client.NewClient()
+	}
+	if len(name) == 0 {
+		name = "go.micro.network"
+	}
+	return &networkService{
+		c:    c,
+		name: name,
+	}
+}
+
+func (c *networkService) Connect(ctx context.Context, in *ConnectRequest, opts ...client.CallOption) (*ConnectResponse, error) {
+	req := c.c.NewRequest(c.name, "Network.Connect", in)
+	out := new(ConnectResponse)
+	err := c.c.Call(ctx, req, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *networkService) Graph(ctx context.Context, in *GraphRequest, opts ...client.CallOption) (*GraphResponse, error) {
+	req := c.c.NewRequest(c.name, "Network.Graph", in)
+	out := new(GraphResponse)
+	err := c.c.Call(ctx, req, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *networkService) Nodes(ctx context.Context, in *NodesRequest, opts ...client.CallOption) (*NodesResponse, error) {
+	req := c.c.NewRequest(c.name, "Network.Nodes", in)
+	out := new(NodesResponse)
+	err := c.c.Call(ctx, req, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *networkService) Routes(ctx context.Context, in *RoutesRequest, opts ...client.CallOption) (*RoutesResponse, error) {
+	req := c.c.NewRequest(c.name, "Network.Routes", in)
+	out := new(RoutesResponse)
+	err := c.c.Call(ctx, req, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *networkService) Services(ctx context.Context, in *ServicesRequest, opts ...client.CallOption) (*ServicesResponse, error) {
+	req := c.c.NewRequest(c.name, "Network.Services", in)
+	out := new(ServicesResponse)
+	err := c.c.Call(ctx, req, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// Server API for Network service
+
+type NetworkHandler interface {
+	// Connect to the network
+	Connect(context.Context, *ConnectRequest, *ConnectResponse) error
+	// Returns the entire network graph
+	Graph(context.Context, *GraphRequest, *GraphResponse) error
+	// Returns a list of known nodes in the network
+	Nodes(context.Context, *NodesRequest, *NodesResponse) error
+	// Returns a list of known routes in the network
+	Routes(context.Context, *RoutesRequest, *RoutesResponse) error
+	// Returns a list of known services based on routes
+	Services(context.Context, *ServicesRequest, *ServicesResponse) error
+}
+
+func RegisterNetworkHandler(s server.Server, hdlr NetworkHandler, opts ...server.HandlerOption) error {
+	type network interface {
+		Connect(ctx context.Context, in *ConnectRequest, out *ConnectResponse) error
+		Graph(ctx context.Context, in *GraphRequest, out *GraphResponse) error
+		Nodes(ctx context.Context, in *NodesRequest, out *NodesResponse) error
+		Routes(ctx context.Context, in *RoutesRequest, out *RoutesResponse) error
+		Services(ctx context.Context, in *ServicesRequest, out *ServicesResponse) error
+	}
+	type Network struct {
+		network
+	}
+	h := &networkHandler{hdlr}
+	return s.Handle(s.NewHandler(&Network{h}, opts...))
+}
+
+type networkHandler struct {
+	NetworkHandler
+}
+
+func (h *networkHandler) Connect(ctx context.Context, in *ConnectRequest, out *ConnectResponse) error {
+	return h.NetworkHandler.Connect(ctx, in, out)
+}
+
+func (h *networkHandler) Graph(ctx context.Context, in *GraphRequest, out *GraphResponse) error {
+	return h.NetworkHandler.Graph(ctx, in, out)
+}
+
+func (h *networkHandler) Nodes(ctx context.Context, in *NodesRequest, out *NodesResponse) error {
+	return h.NetworkHandler.Nodes(ctx, in, out)
+}
+
+func (h *networkHandler) Routes(ctx context.Context, in *RoutesRequest, out *RoutesResponse) error {
+	return h.NetworkHandler.Routes(ctx, in, out)
+}
+
+func (h *networkHandler) Services(ctx context.Context, in *ServicesRequest, out *ServicesResponse) error {
+	return h.NetworkHandler.Services(ctx, in, out)
+}

network/proto/network.pb.go

@@ -0,0 +1,953 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// source: github.com/micro/go-micro/network/proto/network.proto
+
+package go_micro_network
+
+import (
+	context "context"
+	fmt "fmt"
+	proto "github.com/golang/protobuf/proto"
+	proto1 "github.com/micro/go-micro/router/proto"
+	grpc "google.golang.org/grpc"
+	math "math"
+)
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ = proto.Marshal
+var _ = fmt.Errorf
+var _ = math.Inf
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the proto package it is being compiled against.
+// A compilation error at this line likely means your copy of the
+// proto package needs to be updated.
+const _ = proto.ProtoPackageIsVersion3 // please upgrade the proto package
+
+// Query is passed in a LookupRequest
+type Query struct {
+	Service              string   `protobuf:"bytes,1,opt,name=service,proto3" json:"service,omitempty"`
+	Address              string   `protobuf:"bytes,2,opt,name=address,proto3" json:"address,omitempty"`
+	Gateway              string   `protobuf:"bytes,3,opt,name=gateway,proto3" json:"gateway,omitempty"`
+	Router               string   `protobuf:"bytes,4,opt,name=router,proto3" json:"router,omitempty"`
+	Network              string   `protobuf:"bytes,5,opt,name=network,proto3" json:"network,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *Query) Reset()         { *m = Query{} }
+func (m *Query) String() string { return proto.CompactTextString(m) }
+func (*Query) ProtoMessage()    {}
+func (*Query) Descriptor() ([]byte, []int) {
+	return fileDescriptor_0b7953b26a7c4730, []int{0}
+}
+
+func (m *Query) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_Query.Unmarshal(m, b)
+}
+func (m *Query) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_Query.Marshal(b, m, deterministic)
+}
+func (m *Query) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_Query.Merge(m, src)
+}
+func (m *Query) XXX_Size() int {
+	return xxx_messageInfo_Query.Size(m)
+}
+func (m *Query) XXX_DiscardUnknown() {
+	xxx_messageInfo_Query.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_Query proto.InternalMessageInfo
+
+func (m *Query) GetService() string {
+	if m != nil {
+		return m.Service
+	}
+	return ""
+}
+
+func (m *Query) GetAddress() string {
+	if m != nil {
+		return m.Address
+	}
+	return ""
+}
+
+func (m *Query) GetGateway() string {
+	if m != nil {
+		return m.Gateway
+	}
+	return ""
+}
+
+func (m *Query) GetRouter() string {
+	if m != nil {
+		return m.Router
+	}
+	return ""
+}
+
+func (m *Query) GetNetwork() string {
+	if m != nil {
+		return m.Network
+	}
+	return ""
+}
+
+type ConnectRequest struct {
+	Nodes                []*Node  `protobuf:"bytes,1,rep,name=nodes,proto3" json:"nodes,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *ConnectRequest) Reset()         { *m = ConnectRequest{} }
+func (m *ConnectRequest) String() string { return proto.CompactTextString(m) }
+func (*ConnectRequest) ProtoMessage()    {}
+func (*ConnectRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_0b7953b26a7c4730, []int{1}
+}
+
+func (m *ConnectRequest) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_ConnectRequest.Unmarshal(m, b)
+}
+func (m *ConnectRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_ConnectRequest.Marshal(b, m, deterministic)
+}
+func (m *ConnectRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_ConnectRequest.Merge(m, src)
+}
+func (m *ConnectRequest) XXX_Size() int {
+	return xxx_messageInfo_ConnectRequest.Size(m)
+}
+func (m *ConnectRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_ConnectRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_ConnectRequest proto.InternalMessageInfo
+
+func (m *ConnectRequest) GetNodes() []*Node {
+	if m != nil {
+		return m.Nodes
+	}
+	return nil
+}
+
+type ConnectResponse struct {
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *ConnectResponse) Reset()         { *m = ConnectResponse{} }
+func (m *ConnectResponse) String() string { return proto.CompactTextString(m) }
+func (*ConnectResponse) ProtoMessage()    {}
+func (*ConnectResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_0b7953b26a7c4730, []int{2}
+}
+
+func (m *ConnectResponse) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_ConnectResponse.Unmarshal(m, b)
+}
+func (m *ConnectResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_ConnectResponse.Marshal(b, m, deterministic)
+}
+func (m *ConnectResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_ConnectResponse.Merge(m, src)
+}
+func (m *ConnectResponse) XXX_Size() int {
+	return xxx_messageInfo_ConnectResponse.Size(m)
+}
+func (m *ConnectResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_ConnectResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_ConnectResponse proto.InternalMessageInfo
+
+// PeerRequest requests list of peers
+type NodesRequest struct {
+	// node topology depth
+	Depth                uint32   `protobuf:"varint,1,opt,name=depth,proto3" json:"depth,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *NodesRequest) Reset()         { *m = NodesRequest{} }
+func (m *NodesRequest) String() string { return proto.CompactTextString(m) }
+func (*NodesRequest) ProtoMessage()    {}
+func (*NodesRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_0b7953b26a7c4730, []int{3}
+}
+
+func (m *NodesRequest) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_NodesRequest.Unmarshal(m, b)
+}
+func (m *NodesRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_NodesRequest.Marshal(b, m, deterministic)
+}
+func (m *NodesRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_NodesRequest.Merge(m, src)
+}
+func (m *NodesRequest) XXX_Size() int {
+	return xxx_messageInfo_NodesRequest.Size(m)
+}
+func (m *NodesRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_NodesRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_NodesRequest proto.InternalMessageInfo
+
+func (m *NodesRequest) GetDepth() uint32 {
+	if m != nil {
+		return m.Depth
+	}
+	return 0
+}
+
+// PeerResponse is returned by ListPeers
+type NodesResponse struct {
+	// return peer topology
+	Nodes                []*Node  `protobuf:"bytes,1,rep,name=nodes,proto3" json:"nodes,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *NodesResponse) Reset()         { *m = NodesResponse{} }
+func (m *NodesResponse) String() string { return proto.CompactTextString(m) }
+func (*NodesResponse) ProtoMessage()    {}
+func (*NodesResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_0b7953b26a7c4730, []int{4}
+}
+
+func (m *NodesResponse) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_NodesResponse.Unmarshal(m, b)
+}
+func (m *NodesResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_NodesResponse.Marshal(b, m, deterministic)
+}
+func (m *NodesResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_NodesResponse.Merge(m, src)
+}
+func (m *NodesResponse) XXX_Size() int {
+	return xxx_messageInfo_NodesResponse.Size(m)
+}
+func (m *NodesResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_NodesResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_NodesResponse proto.InternalMessageInfo
+
+func (m *NodesResponse) GetNodes() []*Node {
+	if m != nil {
+		return m.Nodes
+	}
+	return nil
+}
+
+type GraphRequest struct {
+	// node topology depth
+	Depth                uint32   `protobuf:"varint,1,opt,name=depth,proto3" json:"depth,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *GraphRequest) Reset()         { *m = GraphRequest{} }
+func (m *GraphRequest) String() string { return proto.CompactTextString(m) }
+func (*GraphRequest) ProtoMessage()    {}
+func (*GraphRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_0b7953b26a7c4730, []int{5}
+}
+
+func (m *GraphRequest) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_GraphRequest.Unmarshal(m, b)
+}
+func (m *GraphRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_GraphRequest.Marshal(b, m, deterministic)
+}
+func (m *GraphRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_GraphRequest.Merge(m, src)
+}
+func (m *GraphRequest) XXX_Size() int {
+	return xxx_messageInfo_GraphRequest.Size(m)
+}
+func (m *GraphRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_GraphRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_GraphRequest proto.InternalMessageInfo
+
+func (m *GraphRequest) GetDepth() uint32 {
+	if m != nil {
+		return m.Depth
+	}
+	return 0
+}
+
+type GraphResponse struct {
+	Root                 *Peer    `protobuf:"bytes,1,opt,name=root,proto3" json:"root,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *GraphResponse) Reset()         { *m = GraphResponse{} }
+func (m *GraphResponse) String() string { return proto.CompactTextString(m) }
+func (*GraphResponse) ProtoMessage()    {}
+func (*GraphResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_0b7953b26a7c4730, []int{6}
+}
+
+func (m *GraphResponse) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_GraphResponse.Unmarshal(m, b)
+}
+func (m *GraphResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_GraphResponse.Marshal(b, m, deterministic)
+}
+func (m *GraphResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_GraphResponse.Merge(m, src)
+}
+func (m *GraphResponse) XXX_Size() int {
+	return xxx_messageInfo_GraphResponse.Size(m)
+}
+func (m *GraphResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_GraphResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_GraphResponse proto.InternalMessageInfo
+
+func (m *GraphResponse) GetRoot() *Peer {
+	if m != nil {
+		return m.Root
+	}
+	return nil
+}
+
+type RoutesRequest struct {
+	// filter based on
+	Query                *Query   `protobuf:"bytes,1,opt,name=query,proto3" json:"query,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *RoutesRequest) Reset()         { *m = RoutesRequest{} }
+func (m *RoutesRequest) String() string { return proto.CompactTextString(m) }
+func (*RoutesRequest) ProtoMessage()    {}
+func (*RoutesRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_0b7953b26a7c4730, []int{7}
+}
+
+func (m *RoutesRequest) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_RoutesRequest.Unmarshal(m, b)
+}
+func (m *RoutesRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_RoutesRequest.Marshal(b, m, deterministic)
+}
+func (m *RoutesRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_RoutesRequest.Merge(m, src)
+}
+func (m *RoutesRequest) XXX_Size() int {
+	return xxx_messageInfo_RoutesRequest.Size(m)
+}
+func (m *RoutesRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_RoutesRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_RoutesRequest proto.InternalMessageInfo
+
+func (m *RoutesRequest) GetQuery() *Query {
+	if m != nil {
+		return m.Query
+	}
+	return nil
+}
+
+type RoutesResponse struct {
+	Routes               []*proto1.Route `protobuf:"bytes,1,rep,name=routes,proto3" json:"routes,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}        `json:"-"`
+	XXX_unrecognized     []byte          `json:"-"`
+	XXX_sizecache        int32           `json:"-"`
+}
+
+func (m *RoutesResponse) Reset()         { *m = RoutesResponse{} }
+func (m *RoutesResponse) String() string { return proto.CompactTextString(m) }
+func (*RoutesResponse) ProtoMessage()    {}
+func (*RoutesResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_0b7953b26a7c4730, []int{8}
+}
+
+func (m *RoutesResponse) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_RoutesResponse.Unmarshal(m, b)
+}
+func (m *RoutesResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_RoutesResponse.Marshal(b, m, deterministic)
+}
+func (m *RoutesResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_RoutesResponse.Merge(m, src)
+}
+func (m *RoutesResponse) XXX_Size() int {
+	return xxx_messageInfo_RoutesResponse.Size(m)
+}
+func (m *RoutesResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_RoutesResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_RoutesResponse proto.InternalMessageInfo
+
+func (m *RoutesResponse) GetRoutes() []*proto1.Route {
+	if m != nil {
+		return m.Routes
+	}
+	return nil
+}
+
+type ServicesRequest struct {
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *ServicesRequest) Reset()         { *m = ServicesRequest{} }
+func (m *ServicesRequest) String() string { return proto.CompactTextString(m) }
+func (*ServicesRequest) ProtoMessage()    {}
+func (*ServicesRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_0b7953b26a7c4730, []int{9}
+}
+
+func (m *ServicesRequest) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_ServicesRequest.Unmarshal(m, b)
+}
+func (m *ServicesRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_ServicesRequest.Marshal(b, m, deterministic)
+}
+func (m *ServicesRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_ServicesRequest.Merge(m, src)
+}
+func (m *ServicesRequest) XXX_Size() int {
+	return xxx_messageInfo_ServicesRequest.Size(m)
+}
+func (m *ServicesRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_ServicesRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_ServicesRequest proto.InternalMessageInfo
+
+type ServicesResponse struct {
+	Services             []string `protobuf:"bytes,1,rep,name=services,proto3" json:"services,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *ServicesResponse) Reset()         { *m = ServicesResponse{} }
+func (m *ServicesResponse) String() string { return proto.CompactTextString(m) }
+func (*ServicesResponse) ProtoMessage()    {}
+func (*ServicesResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_0b7953b26a7c4730, []int{10}
+}
+
+func (m *ServicesResponse) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_ServicesResponse.Unmarshal(m, b)
+}
+func (m *ServicesResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_ServicesResponse.Marshal(b, m, deterministic)
+}
+func (m *ServicesResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_ServicesResponse.Merge(m, src)
+}
+func (m *ServicesResponse) XXX_Size() int {
+	return xxx_messageInfo_ServicesResponse.Size(m)
+}
+func (m *ServicesResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_ServicesResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_ServicesResponse proto.InternalMessageInfo
+
+func (m *ServicesResponse) GetServices() []string {
+	if m != nil {
+		return m.Services
+	}
+	return nil
+}
+
+// Node is network node
+type Node struct {
+	// node id
+	Id string `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
+	// node address
+	Address string `protobuf:"bytes,2,opt,name=address,proto3" json:"address,omitempty"`
+	// the network
+	Network string `protobuf:"bytes,3,opt,name=network,proto3" json:"network,omitempty"`
+	// associated metadata
+	Metadata             map[string]string `protobuf:"bytes,4,rep,name=metadata,proto3" json:"metadata,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	XXX_NoUnkeyedLiteral struct{}          `json:"-"`
+	XXX_unrecognized     []byte            `json:"-"`
+	XXX_sizecache        int32             `json:"-"`
+}
+
+func (m *Node) Reset()         { *m = Node{} }
+func (m *Node) String() string { return proto.CompactTextString(m) }
+func (*Node) ProtoMessage()    {}
+func (*Node) Descriptor() ([]byte, []int) {
+	return fileDescriptor_0b7953b26a7c4730, []int{11}
+}
+
+func (m *Node) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_Node.Unmarshal(m, b)
+}
+func (m *Node) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_Node.Marshal(b, m, deterministic)
+}
+func (m *Node) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_Node.Merge(m, src)
+}
+func (m *Node) XXX_Size() int {
+	return xxx_messageInfo_Node.Size(m)
+}
+func (m *Node) XXX_DiscardUnknown() {
+	xxx_messageInfo_Node.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_Node proto.InternalMessageInfo
+
+func (m *Node) GetId() string {
+	if m != nil {
+		return m.Id
+	}
+	return ""
+}
+
+func (m *Node) GetAddress() string {
+	if m != nil {
+		return m.Address
+	}
+	return ""
+}
+
+func (m *Node) GetNetwork() string {
+	if m != nil {
+		return m.Network
+	}
+	return ""
+}
+
+func (m *Node) GetMetadata() map[string]string {
+	if m != nil {
+		return m.Metadata
+	}
+	return nil
+}
+
+// Connect is sent when the node connects to the network
+type Connect struct {
+	// network mode
+	Node                 *Node    `protobuf:"bytes,1,opt,name=node,proto3" json:"node,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *Connect) Reset()         { *m = Connect{} }
+func (m *Connect) String() string { return proto.CompactTextString(m) }
+func (*Connect) ProtoMessage()    {}
+func (*Connect) Descriptor() ([]byte, []int) {
+	return fileDescriptor_0b7953b26a7c4730, []int{12}
+}
+
+func (m *Connect) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_Connect.Unmarshal(m, b)
+}
+func (m *Connect) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_Connect.Marshal(b, m, deterministic)
+}
+func (m *Connect) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_Connect.Merge(m, src)
+}
+func (m *Connect) XXX_Size() int {
+	return xxx_messageInfo_Connect.Size(m)
+}
+func (m *Connect) XXX_DiscardUnknown() {
+	xxx_messageInfo_Connect.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_Connect proto.InternalMessageInfo
+
+func (m *Connect) GetNode() *Node {
+	if m != nil {
+		return m.Node
+	}
+	return nil
+}
+
+// Close is sent when the node disconnects from the network
+type Close struct {
+	// network node
+	Node                 *Node    `protobuf:"bytes,1,opt,name=node,proto3" json:"node,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *Close) Reset()         { *m = Close{} }
+func (m *Close) String() string { return proto.CompactTextString(m) }
+func (*Close) ProtoMessage()    {}
+func (*Close) Descriptor() ([]byte, []int) {
+	return fileDescriptor_0b7953b26a7c4730, []int{13}
+}
+
+func (m *Close) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_Close.Unmarshal(m, b)
+}
+func (m *Close) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_Close.Marshal(b, m, deterministic)
+}
+func (m *Close) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_Close.Merge(m, src)
+}
+func (m *Close) XXX_Size() int {
+	return xxx_messageInfo_Close.Size(m)
+}
+func (m *Close) XXX_DiscardUnknown() {
+	xxx_messageInfo_Close.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_Close proto.InternalMessageInfo
+
+func (m *Close) GetNode() *Node {
+	if m != nil {
+		return m.Node
+	}
+	return nil
+}
+
+// Peer is used to advertise node peers
+type Peer struct {
+	// network node
+	Node *Node `protobuf:"bytes,1,opt,name=node,proto3" json:"node,omitempty"`
+	// node peers
+	Peers                []*Peer  `protobuf:"bytes,2,rep,name=peers,proto3" json:"peers,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *Peer) Reset()         { *m = Peer{} }
+func (m *Peer) String() string { return proto.CompactTextString(m) }
+func (*Peer) ProtoMessage()    {}
+func (*Peer) Descriptor() ([]byte, []int) {
+	return fileDescriptor_0b7953b26a7c4730, []int{14}
+}
+
+func (m *Peer) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_Peer.Unmarshal(m, b)
+}
+func (m *Peer) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_Peer.Marshal(b, m, deterministic)
+}
+func (m *Peer) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_Peer.Merge(m, src)
+}
+func (m *Peer) XXX_Size() int {
+	return xxx_messageInfo_Peer.Size(m)
+}
+func (m *Peer) XXX_DiscardUnknown() {
+	xxx_messageInfo_Peer.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_Peer proto.InternalMessageInfo
+
+func (m *Peer) GetNode() *Node {
+	if m != nil {
+		return m.Node
+	}
+	return nil
+}
+
+func (m *Peer) GetPeers() []*Peer {
+	if m != nil {
+		return m.Peers
+	}
+	return nil
+}
+
+func init() {
+	proto.RegisterType((*Query)(nil), "go.micro.network.Query")
+	proto.RegisterType((*ConnectRequest)(nil), "go.micro.network.ConnectRequest")
+	proto.RegisterType((*ConnectResponse)(nil), "go.micro.network.ConnectResponse")
+	proto.RegisterType((*NodesRequest)(nil), "go.micro.network.NodesRequest")
+	proto.RegisterType((*NodesResponse)(nil), "go.micro.network.NodesResponse")
+	proto.RegisterType((*GraphRequest)(nil), "go.micro.network.GraphRequest")
+	proto.RegisterType((*GraphResponse)(nil), "go.micro.network.GraphResponse")
+	proto.RegisterType((*RoutesRequest)(nil), "go.micro.network.RoutesRequest")
+	proto.RegisterType((*RoutesResponse)(nil), "go.micro.network.RoutesResponse")
+	proto.RegisterType((*ServicesRequest)(nil), "go.micro.network.ServicesRequest")
+	proto.RegisterType((*ServicesResponse)(nil), "go.micro.network.ServicesResponse")
+	proto.RegisterType((*Node)(nil), "go.micro.network.Node")
+	proto.RegisterMapType((map[string]string)(nil), "go.micro.network.Node.MetadataEntry")
+	proto.RegisterType((*Connect)(nil), "go.micro.network.Connect")
+	proto.RegisterType((*Close)(nil), "go.micro.network.Close")
+	proto.RegisterType((*Peer)(nil), "go.micro.network.Peer")
+}
+
+func init() {
+	proto.RegisterFile("github.com/micro/go-micro/network/proto/network.proto", fileDescriptor_0b7953b26a7c4730)
+}
+
+var fileDescriptor_0b7953b26a7c4730 = []byte{
+	// 573 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x94, 0x54, 0x61, 0x6a, 0xdb, 0x4c,
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+	0x93, 0x6a, 0x7b, 0xe5, 0x66, 0x71, 0xd7, 0xcc, 0xc2, 0xce, 0xa0, 0x35, 0x43, 0x15, 0x27, 0xb1,
+	0x8a, 0xfd, 0xba, 0xe9, 0xa0, 0x5f, 0xbe, 0xa5, 0xf0, 0x82, 0x60, 0x5f, 0x53, 0x25, 0x97, 0x51,
+	0xc1, 0x0a, 0x4e, 0xa0, 0xbd, 0x96, 0x62, 0x5d, 0x70, 0x6f, 0x71, 0x49, 0xef, 0xd2, 0x3f, 0xf5,
+	0x26, 0x1f, 0xe2, 0xbb, 0x05, 0xd2, 0xb3, 0x6c, 0xf0, 0xb9, 0xf6, 0xc9, 0xe1, 0xc7, 0xd0, 0x24,
+	0xaf, 0xe9, 0x3d, 0x6a, 0x1f, 0x6c, 0xdf, 0xa3, 0xf1, 0x8a, 0xc1, 0xf0, 0x21, 0x78, 0xe7, 0x77,
+	0xc2, 0x2e, 0xff, 0x9f, 0x49, 0x3f, 0xa1, 0xae, 0xad, 0xf0, 0x12, 0x8e, 0x76, 0xf0, 0x1c, 0x51,
+	0xea, 0x81, 0xba, 0x15, 0xee, 0xb2, 0xa0, 0xa3, 0xdf, 0x2e, 0x34, 0x2f, 0x69, 0xb0, 0x57, 0x4f,
+	0x9d, 0xf5, 0x36, 0x59, 0xeb, 0x07, 0x1a, 0xbc, 0xaf, 0x40, 0xd0, 0x09, 0xee, 0xb0, 0xef, 0xe0,
+	0x19, 0xe7, 0xb3, 0xb7, 0x9b, 0xe8, 0xd5, 0xc3, 0x09, 0xde, 0x6d, 0xcd, 0xaf, 0x6a, 0x99, 0x53,
+	0x2d, 0xd3, 0x5a, 0xbd, 0xf4, 0x32, 0xad, 0xb5, 0x1b, 0xe7, 0x3b, 0xec, 0x02, 0x1a, 0xf6, 0x28,
+	0x58, 0x09, 0x78, 0xed, 0xdc, 0x82, 0xde, 0x76, 0x40, 0x21, 0x77, 0x0d, 0xad, 0xfc, 0x1c, 0x58,
+	0xc9, 0x5c, 0x9e, 0x5d, 0x4f, 0xc0, 0xab, 0x20, 0xb9, 0xe8, 0x4d, 0xc3, 0xfc, 0x49, 0x0f, 0xff,
+	0x06, 0x00, 0x00, 0xff, 0xff, 0x79, 0x8a, 0x5f, 0xf0, 0x24, 0x06, 0x00, 0x00,
+}
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ context.Context
+var _ grpc.ClientConn
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+const _ = grpc.SupportPackageIsVersion4
+
+// NetworkClient is the client API for Network service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://godoc.org/google.golang.org/grpc#ClientConn.NewStream.
+type NetworkClient interface {
+	// Connect to the network
+	Connect(ctx context.Context, in *ConnectRequest, opts ...grpc.CallOption) (*ConnectResponse, error)
+	// Returns the entire network graph
+	Graph(ctx context.Context, in *GraphRequest, opts ...grpc.CallOption) (*GraphResponse, error)
+	// Returns a list of known nodes in the network
+	Nodes(ctx context.Context, in *NodesRequest, opts ...grpc.CallOption) (*NodesResponse, error)
+	// Returns a list of known routes in the network
+	Routes(ctx context.Context, in *RoutesRequest, opts ...grpc.CallOption) (*RoutesResponse, error)
+	// Returns a list of known services based on routes
+	Services(ctx context.Context, in *ServicesRequest, opts ...grpc.CallOption) (*ServicesResponse, error)
+}
+
+type networkClient struct {
+	cc *grpc.ClientConn
+}
+
+func NewNetworkClient(cc *grpc.ClientConn) NetworkClient {
+	return &networkClient{cc}
+}
+
+func (c *networkClient) Connect(ctx context.Context, in *ConnectRequest, opts ...grpc.CallOption) (*ConnectResponse, error) {
+	out := new(ConnectResponse)
+	err := c.cc.Invoke(ctx, "/go.micro.network.Network/Connect", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *networkClient) Graph(ctx context.Context, in *GraphRequest, opts ...grpc.CallOption) (*GraphResponse, error) {
+	out := new(GraphResponse)
+	err := c.cc.Invoke(ctx, "/go.micro.network.Network/Graph", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *networkClient) Nodes(ctx context.Context, in *NodesRequest, opts ...grpc.CallOption) (*NodesResponse, error) {
+	out := new(NodesResponse)
+	err := c.cc.Invoke(ctx, "/go.micro.network.Network/Nodes", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *networkClient) Routes(ctx context.Context, in *RoutesRequest, opts ...grpc.CallOption) (*RoutesResponse, error) {
+	out := new(RoutesResponse)
+	err := c.cc.Invoke(ctx, "/go.micro.network.Network/Routes", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *networkClient) Services(ctx context.Context, in *ServicesRequest, opts ...grpc.CallOption) (*ServicesResponse, error) {
+	out := new(ServicesResponse)
+	err := c.cc.Invoke(ctx, "/go.micro.network.Network/Services", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// NetworkServer is the server API for Network service.
+type NetworkServer interface {
+	// Connect to the network
+	Connect(context.Context, *ConnectRequest) (*ConnectResponse, error)
+	// Returns the entire network graph
+	Graph(context.Context, *GraphRequest) (*GraphResponse, error)
+	// Returns a list of known nodes in the network
+	Nodes(context.Context, *NodesRequest) (*NodesResponse, error)
+	// Returns a list of known routes in the network
+	Routes(context.Context, *RoutesRequest) (*RoutesResponse, error)
+	// Returns a list of known services based on routes
+	Services(context.Context, *ServicesRequest) (*ServicesResponse, error)
+}
+
+func RegisterNetworkServer(s *grpc.Server, srv NetworkServer) {
+	s.RegisterService(&_Network_serviceDesc, srv)
+}
+
+func _Network_Connect_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(ConnectRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(NetworkServer).Connect(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/go.micro.network.Network/Connect",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(NetworkServer).Connect(ctx, req.(*ConnectRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _Network_Graph_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(GraphRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(NetworkServer).Graph(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/go.micro.network.Network/Graph",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(NetworkServer).Graph(ctx, req.(*GraphRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _Network_Nodes_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(NodesRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(NetworkServer).Nodes(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/go.micro.network.Network/Nodes",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(NetworkServer).Nodes(ctx, req.(*NodesRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _Network_Routes_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(RoutesRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(NetworkServer).Routes(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/go.micro.network.Network/Routes",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(NetworkServer).Routes(ctx, req.(*RoutesRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _Network_Services_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(ServicesRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(NetworkServer).Services(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/go.micro.network.Network/Services",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(NetworkServer).Services(ctx, req.(*ServicesRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+var _Network_serviceDesc = grpc.ServiceDesc{
+	ServiceName: "go.micro.network.Network",
+	HandlerType: (*NetworkServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "Connect",
+			Handler:    _Network_Connect_Handler,
+		},
+		{
+			MethodName: "Graph",
+			Handler:    _Network_Graph_Handler,
+		},
+		{
+			MethodName: "Nodes",
+			Handler:    _Network_Nodes_Handler,
+		},
+		{
+			MethodName: "Routes",
+			Handler:    _Network_Routes_Handler,
+		},
+		{
+			MethodName: "Services",
+			Handler:    _Network_Services_Handler,
+		},
+	},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: "github.com/micro/go-micro/network/proto/network.proto",
+}

network/proto/network.proto

@@ -0,0 +1,102 @@
+syntax = "proto3";
+
+package go.micro.network;
+
+import "github.com/micro/go-micro/router/proto/router.proto";
+
+// Network service is usesd to gain visibility into networks
+service Network {
+	// Connect to the network
+	rpc Connect(ConnectRequest) returns (ConnectResponse) {};
+	// Returns the entire network graph
+	rpc Graph(GraphRequest) returns (GraphResponse) {};
+	// Returns a list of known nodes in the network
+        rpc Nodes(NodesRequest) returns (NodesResponse) {};
+	// Returns a list of known routes in the network
+        rpc Routes(RoutesRequest) returns (RoutesResponse) {};
+	// Returns a list of known services based on routes
+	rpc Services(ServicesRequest) returns (ServicesResponse) {};
+}
+
+// Query is passed in a LookupRequest
+message Query {
+	string service = 1;
+	string address = 2;
+	string gateway = 3;
+	string router = 4;
+	string network = 5;
+}
+
+message ConnectRequest {
+	repeated Node nodes = 1;
+}
+
+message ConnectResponse {}
+
+// PeerRequest requests list of peers
+message NodesRequest {
+        // node topology depth
+        uint32 depth = 1;
+}
+
+// PeerResponse is returned by ListPeers
+message NodesResponse {
+        // return peer topology
+        repeated Node nodes = 1;
+}
+
+message GraphRequest {
+        // node topology depth
+        uint32 depth = 1;
+}
+
+message GraphResponse {
+	Peer root = 1;
+}
+
+message RoutesRequest {	
+	// filter based on
+	Query query = 1;
+}
+
+message RoutesResponse {
+	repeated go.micro.router.Route routes = 1;
+}
+
+message ServicesRequest {}
+
+message ServicesResponse {
+	repeated string services = 1;
+}
+
+// Node is network node
+message Node {
+        // node id
+        string id = 1;
+        // node address
+        string address = 2;
+        // the network
+        string network = 3;
+        // associated metadata
+        map<string,string> metadata = 4;
+}
+
+// Connect is sent when the node connects to the network
+message Connect {
+        // network mode
+        Node node = 1;
+}
+
+// Close is sent when the node disconnects from the network
+message Close {
+        // network node
+        Node node = 1;
+}
+
+// Peer is used to advertise node peers
+message Peer {
+        // network node
+        Node node = 1;
+        // node peers
+        repeated Peer peers = 2;
+}

network/resolver/dns/dns.go

@@ -1,30 +1,42 @@
-// Package dns resolves names to dns srv records
+// Package dns resolves names to dns records
 package dns
 
 import (
-	"fmt"
 	"net"
 
 	"github.com/micro/go-micro/network/resolver"
 )
 
+// Resolver is a DNS network resolve
 type Resolver struct{}
 
 // Resolve assumes ID is a domain name e.g micro.mu
 func (r *Resolver) Resolve(name string) ([]*resolver.Record, error) {
-	_, addrs, err := net.LookupSRV("network", "udp", name)
+	host, port, err := net.SplitHostPort(name)
+	if err != nil {
+		host = name
+		port = "8085"
+	}
+
+	if len(host) == 0 {
+		host = "localhost"
+	}
+
+	addrs, err := net.LookupHost(host)
 	if err != nil {
 		return nil, err
 	}
+
 	var records []*resolver.Record
+
 	for _, addr := range addrs {
-		address := addr.Target
-		if addr.Port > 0 {
-			address = fmt.Sprintf("%s:%d", addr.Target, addr.Port)
-		}
+		// join resolved record with port
+		address := net.JoinHostPort(addr, port)
+		// append to record set
 		records = append(records, &resolver.Record{
 			Address: address,
 		})
 	}
+
 	return records, nil
 }

network/resolver/dnssrv/dnssrv.go

@@ -0,0 +1,31 @@
+// Package dns srv resolves names to dns srv records
+package dnssrv
+
+import (
+	"fmt"
+	"net"
+
+	"github.com/micro/go-micro/network/resolver"
+)
+
+// Resolver is a DNS network resolve
+type Resolver struct{}
+
+// Resolve assumes ID is a domain name e.g micro.mu
+func (r *Resolver) Resolve(name string) ([]*resolver.Record, error) {
+	_, addrs, err := net.LookupSRV("network", "udp", name)
+	if err != nil {
+		return nil, err
+	}
+	var records []*resolver.Record
+	for _, addr := range addrs {
+		address := addr.Target
+		if addr.Port > 0 {
+			address = fmt.Sprintf("%s:%d", addr.Target, addr.Port)
+		}
+		records = append(records, &resolver.Record{
+			Address: address,
+		})
+	}
+	return records, nil
+}

network/resolver/http/http.go

@@ -3,6 +3,7 @@ package http
 
 import (
 	"encoding/json"
+	"errors"
 	"io/ioutil"
 	"net/http"
 	"net/url"
@@ -10,17 +11,26 @@ import (
 	"github.com/micro/go-micro/network/resolver"
 )
 
+// Resolver is a HTTP network resolver
 type Resolver struct {
 	// If not set, defaults to http
 	Proto string
 
 	// Path sets the path to lookup. Defaults to /network
 	Path string
+
+	// Host url to use for the query
+	Host string
+}
+
+type Response struct {
+	Nodes []*resolver.Record `json:"nodes,omitempty"`
 }
 
 // Resolve assumes ID is a domain which can be converted to a http://name/network request
 func (r *Resolver) Resolve(name string) ([]*resolver.Record, error) {
-	proto := "http"
+	proto := "https"
+	host := "micro.mu"
 	path := "/network"
 
 	if len(r.Proto) > 0 {
@@ -31,29 +41,38 @@ func (r *Resolver) Resolve(name string) ([]*resolver.Record, error) {
 		path = r.Path
 	}
 
+	if len(r.Host) > 0 {
+		host = r.Host
+	}
+
 	uri := &url.URL{
 		Scheme: proto,
 		Path:   path,
-		Host:   name,
+		Host:   host,
 	}
+	q := uri.Query()
+	q.Set("name", name)
+	uri.RawQuery = q.Encode()
 
 	rsp, err := http.Get(uri.String())
 	if err != nil {
 		return nil, err
 	}
 	defer rsp.Body.Close()
-
+	if rsp.StatusCode != 200 {
+		return nil, errors.New("non 200 response")
+	}
 	b, err := ioutil.ReadAll(rsp.Body)
 	if err != nil {
 		return nil, err
 	}
 
 	// encoding format is assumed to be json
-	var records []*resolver.Record
+	var response *Response
 
-	if err := json.Unmarshal(b, &records); err != nil {
+	if err := json.Unmarshal(b, &response); err != nil {
 		return nil, err
 	}
 
-	return records, nil
+	return response.Nodes, nil
 }

network/resolver/registry/registry.go

@@ -6,6 +6,7 @@ import (
 	"github.com/micro/go-micro/registry"
 )
 
+// Resolver is a registry network resolver
 type Resolver struct {
 	// Registry is the registry to use otherwise we use the defaul
 	Registry registry.Registry

network/resolver/resolver.go

@@ -5,7 +5,7 @@ package resolver
 // via the name to connect to. This is done based on Network.Name().
 // Before we can be part of any network, we have to connect to it.
 type Resolver interface {
-	// Resolve returns a list of addresses for an name
+	// Resolve returns a list of addresses for a name
 	Resolve(name string) ([]*Record, error)
 }
 

network/resolver/static/static.go

@@ -0,0 +1,33 @@
+// Package static is a static resolver
+package registry
+
+import (
+	"github.com/micro/go-micro/network/resolver"
+)
+
+// Resolver returns a static list of nodes. In the event the node list
+// is not present it will return the name of the network passed in.
+type Resolver struct {
+	// A static list of nodes
+	Nodes []string
+}
+
+// Resolve returns the list of nodes
+func (r *Resolver) Resolve(name string) ([]*resolver.Record, error) {
+	// if there are no nodes just return the name
+	if len(r.Nodes) == 0 {
+		return []*resolver.Record{
+			{Address: name},
+		}, nil
+	}
+
+	var records []*resolver.Record
+
+	for _, node := range r.Nodes {
+		records = append(records, &resolver.Record{
+			Address: node,
+		})
+	}
+
+	return records, nil
+}

network/service/handler/handler.go

@@ -0,0 +1,211 @@
+// Package handler implements network RPC handler
+package handler
+
+import (
+	"context"
+
+	"github.com/micro/go-micro/errors"
+	"github.com/micro/go-micro/network"
+	pbNet "github.com/micro/go-micro/network/proto"
+	"github.com/micro/go-micro/router"
+	pbRtr "github.com/micro/go-micro/router/proto"
+	"github.com/micro/go-micro/util/log"
+)
+
+// Network implements network handler
+type Network struct {
+	Network network.Network
+}
+
+func flatten(n network.Node, visited map[string]bool) []network.Node {
+	// if node is nil runaway
+	if n == nil {
+		return nil
+	}
+
+	// set visisted
+	if visited == nil {
+		visited = make(map[string]bool)
+	}
+
+	// create new list of nodes
+	var nodes []network.Node
+
+	// check if already visited
+	if visited[n.Id()] == false {
+		// append the current node
+		nodes = append(nodes, n)
+	}
+
+	// set to visited
+	visited[n.Id()] = true
+
+	// visit the list of peers
+	for _, node := range n.Peers() {
+		nodes = append(nodes, flatten(node, visited)...)
+	}
+
+	return nodes
+}
+
+func (n *Network) Connect(ctx context.Context, req *pbNet.ConnectRequest, resp *pbNet.ConnectResponse) error {
+	if len(req.Nodes) == 0 {
+		return nil
+	}
+
+	// get list of existing nodes
+	nodes := n.Network.Options().Peers
+
+	// generate a node map
+	nodeMap := make(map[string]bool)
+
+	for _, node := range nodes {
+		nodeMap[node] = true
+	}
+
+	for _, node := range req.Nodes {
+		// TODO: we may have been provided a network only
+		// so process anad resolve node.Network
+		if len(node.Address) == 0 {
+			continue
+		}
+
+		// already exists
+		if _, ok := nodeMap[node.Address]; ok {
+			continue
+		}
+
+		nodeMap[node.Address] = true
+		nodes = append(nodes, node.Address)
+	}
+
+	log.Infof("Network.Connect setting peers: %v", nodes)
+
+	// reinitialise the peers
+	n.Network.Init(
+		network.Peers(nodes...),
+	)
+
+	// call the connect method
+	n.Network.Connect()
+
+	return nil
+}
+
+// Nodes returns the list of nodes
+func (n *Network) Nodes(ctx context.Context, req *pbNet.NodesRequest, resp *pbNet.NodesResponse) error {
+	depth := uint(req.Depth)
+	if depth <= 0 || depth > network.MaxDepth {
+		depth = network.MaxDepth
+	}
+
+	// root node
+	nodes := map[string]network.Node{}
+
+	// get peers encoded into protobuf
+	peers := flatten(n.Network, nil)
+
+	// walk all the peers
+	for _, peer := range peers {
+		if peer == nil {
+			continue
+		}
+		if _, ok := nodes[peer.Id()]; ok {
+			continue
+		}
+
+		// add to visited list
+		nodes[n.Network.Id()] = peer
+
+		resp.Nodes = append(resp.Nodes, &pbNet.Node{
+			Id:      peer.Id(),
+			Address: peer.Address(),
+		})
+	}
+
+	return nil
+}
+
+// Graph returns the network graph from this root node
+func (n *Network) Graph(ctx context.Context, req *pbNet.GraphRequest, resp *pbNet.GraphResponse) error {
+	depth := uint(req.Depth)
+	if depth <= 0 || depth > network.MaxDepth {
+		depth = network.MaxDepth
+	}
+
+	// get peers encoded into protobuf
+	peers := network.PeersToProto(n.Network, depth)
+
+	// set the root node
+	resp.Root = peers
+
+	return nil
+}
+
+// Routes returns a list of routing table routes
+func (n *Network) Routes(ctx context.Context, req *pbNet.RoutesRequest, resp *pbNet.RoutesResponse) error {
+	// build query
+
+	var qOpts []router.QueryOption
+
+	if q := req.Query; q != nil {
+		if len(q.Service) > 0 {
+			qOpts = append(qOpts, router.QueryService(q.Service))
+		}
+		if len(q.Address) > 0 {
+			qOpts = append(qOpts, router.QueryAddress(q.Address))
+		}
+		if len(q.Gateway) > 0 {
+			qOpts = append(qOpts, router.QueryGateway(q.Gateway))
+		}
+		if len(q.Router) > 0 {
+			qOpts = append(qOpts, router.QueryRouter(q.Router))
+		}
+		if len(q.Network) > 0 {
+			qOpts = append(qOpts, router.QueryNetwork(q.Network))
+		}
+	}
+
+	routes, err := n.Network.Options().Router.Table().Query(qOpts...)
+	if err != nil {
+		return errors.InternalServerError("go.micro.network", "failed to list routes: %s", err)
+	}
+
+	var respRoutes []*pbRtr.Route
+	for _, route := range routes {
+		respRoute := &pbRtr.Route{
+			Service: route.Service,
+			Address: route.Address,
+			Gateway: route.Gateway,
+			Network: route.Network,
+			Router:  route.Router,
+			Link:    route.Link,
+			Metric:  int64(route.Metric),
+		}
+		respRoutes = append(respRoutes, respRoute)
+	}
+
+	resp.Routes = respRoutes
+
+	return nil
+}
+
+// Services returns a list of services based on the routing table
+func (n *Network) Services(ctx context.Context, req *pbNet.ServicesRequest, resp *pbNet.ServicesResponse) error {
+	routes, err := n.Network.Options().Router.Table().List()
+	if err != nil {
+		return errors.InternalServerError("go.micro.network", "failed to list services: %s", err)
+	}
+
+	services := make(map[string]bool)
+
+	for _, route := range routes {
+		if _, ok := services[route.Service]; ok {
+			continue
+		}
+		services[route.Service] = true
+		resp.Services = append(resp.Services, route.Service)
+	}
+
+	return nil
+}

network/tunnel/default.go

@@ -1,337 +0,0 @@
-package tunnel
-
-import (
-	"crypto/sha256"
-	"errors"
-	"fmt"
-	"sync"
-
-	"github.com/google/uuid"
-	"github.com/micro/go-micro/network/link"
-	"github.com/micro/go-micro/transport"
-)
-
-// tun represents a network tunnel
-type tun struct {
-	// the link on top of which we build a tunnel
-	link link.Link
-
-	sync.RWMutex
-
-	// to indicate if we're connected or not
-	connected bool
-
-	// the send channel for all messages
-	send chan *message
-
-	// close channel
-	closed chan bool
-
-	// a map of sockets based on Micro-Tunnel-Id
-	sockets map[string]*socket
-}
-
-// create new tunnel on top of a link
-func newTunnel(link link.Link) *tun {
-	return &tun{
-		link:    link,
-		send:    make(chan *message, 128),
-		closed:  make(chan bool),
-		sockets: make(map[string]*socket),
-	}
-}
-
-// getSocket returns a socket from the internal socket map.
-// It does this based on the Micro-Tunnel-Id and Micro-Tunnel-Session
-func (t *tun) getSocket(id, session string) (*socket, bool) {
-	// get the socket
-	t.RLock()
-	s, ok := t.sockets[id+session]
-	t.RUnlock()
-	return s, ok
-}
-
-// newSocket creates a new socket and saves it
-func (t *tun) newSocket(id, session string) (*socket, bool) {
-	// hash the id
-	h := sha256.New()
-	h.Write([]byte(id))
-	id = fmt.Sprintf("%x", h.Sum(nil))
-
-	// new socket
-	s := &socket{
-		id:      id,
-		session: session,
-		closed:  make(chan bool),
-		recv:    make(chan *message, 128),
-		send:    t.send,
-		wait:    make(chan bool),
-	}
-
-	// save socket
-	t.Lock()
-	_, ok := t.sockets[id+session]
-	if ok {
-		// socket already exists
-		t.Unlock()
-		return nil, false
-	}
-	t.sockets[id+session] = s
-	t.Unlock()
-
-	// return socket
-	return s, true
-}
-
-// TODO: use tunnel id as part of the session
-func (t *tun) newSession() string {
-	return uuid.New().String()
-}
-
-// process outgoing messages sent by all local sockets
-func (t *tun) process() {
-	// manage the send buffer
-	// all pseudo sockets throw everything down this
-	for {
-		select {
-		case msg := <-t.send:
-			nmsg := &transport.Message{
-				Header: msg.data.Header,
-				Body:   msg.data.Body,
-			}
-
-			// set the tunnel id on the outgoing message
-			nmsg.Header["Micro-Tunnel-Id"] = msg.id
-
-			// set the session id
-			nmsg.Header["Micro-Tunnel-Session"] = msg.session
-
-			// send the message via the interface
-			if err := t.link.Send(nmsg); err != nil {
-				// no op
-				// TODO: do something
-			}
-		case <-t.closed:
-			return
-		}
-	}
-}
-
-// process incoming messages
-func (t *tun) listen() {
-	for {
-		// process anything via the net interface
-		msg := new(transport.Message)
-		err := t.link.Recv(msg)
-		if err != nil {
-			return
-		}
-
-		// first check Micro-Tunnel
-		switch msg.Header["Micro-Tunnel"] {
-		case "connect":
-			// assuming new connection
-			// TODO: do something with this
-			continue
-		case "close":
-			// assuming connection closed
-			// TODO: do something with this
-			continue
-		}
-
-		// the tunnel id
-		id := msg.Header["Micro-Tunnel-Id"]
-
-		// the session id
-		session := msg.Header["Micro-Tunnel-Session"]
-
-		// if the session id is blank there's nothing we can do
-		// TODO: check this is the case, is there any reason
-		// why we'd have a blank session? Is the tunnel
-		// used for some other purpose?
-		if len(id) == 0 || len(session) == 0 {
-			continue
-		}
-
-		// get the socket based on the tunnel id and session
-		// this could be something we dialed in which case
-		// we have a session for it otherwise its a listener
-		s, exists := t.getSocket(id, session)
-		if !exists {
-			// try get it based on just the tunnel id
-			// the assumption here is that a listener
-			// has no session but its set a listener session
-			s, exists = t.getSocket(id, "listener")
-			if !exists {
-				// drop it, we don't care about
-				// messages we don't know about
-				continue
-			}
-		}
-
-		// is the socket closed?
-		select {
-		case <-s.closed:
-			// closed
-			delete(t.sockets, id)
-			continue
-		default:
-			// process
-		}
-
-		// is the socket new?
-		select {
-		// if its new the socket is actually blocked waiting
-		// for a connection. so we check if its waiting.
-		case <-s.wait:
-		// if its waiting e.g its new then we close it
-		default:
-			// set remote address of the socket
-			s.remote = msg.Header["Remote"]
-			close(s.wait)
-		}
-
-		// construct a new transport message
-		tmsg := &transport.Message{
-			Header: msg.Header,
-			Body:   msg.Body,
-		}
-
-		// construct the internal message
-		imsg := &message{
-			id:      id,
-			session: session,
-			data:    tmsg,
-		}
-
-		// append to recv backlog
-		// we don't block if we can't pass it on
-		select {
-		case s.recv <- imsg:
-		default:
-		}
-	}
-}
-
-func (t *tun) connect() error {
-	return t.link.Send(&transport.Message{
-		Header: map[string]string{
-			"Micro-Tunnel": "connect",
-		},
-	})
-}
-
-func (t *tun) close() error {
-	return t.link.Send(&transport.Message{
-		Header: map[string]string{
-			"Micro-Tunnel": "close",
-		},
-	})
-}
-
-// Close the tunnel
-func (t *tun) Close() error {
-	t.Lock()
-	defer t.Unlock()
-
-	if !t.connected {
-		return nil
-	}
-
-	select {
-	case <-t.closed:
-		return nil
-	default:
-		// close all the sockets
-		for _, s := range t.sockets {
-			s.Close()
-		}
-		// close the connection
-		close(t.closed)
-		t.connected = false
-
-		// send a close message
-		// we don't close the link
-		// just the tunnel
-		return t.close()
-	}
-
-	return nil
-}
-
-// Connect the tunnel
-func (t *tun) Connect() error {
-	t.Lock()
-	defer t.Unlock()
-
-	// already connected
-	if t.connected {
-		return nil
-	}
-
-	// send the connect message
-	if err := t.connect(); err != nil {
-		return err
-	}
-
-	// set as connected
-	t.connected = true
-	// create new close channel
-	t.closed = make(chan bool)
-
-	// process messages to be sent
-	go t.process()
-	// process incoming messages
-	go t.listen()
-
-	return nil
-}
-
-// Dial an address
-func (t *tun) Dial(addr string) (Conn, error) {
-	c, ok := t.newSocket(addr, t.newSession())
-	if !ok {
-		return nil, errors.New("error dialing " + addr)
-	}
-	// set remote
-	c.remote = addr
-	// set local
-	c.local = t.link.Local()
-
-	return c, nil
-}
-
-// Accept a connection on the address
-func (t *tun) Listen(addr string) (Listener, error) {
-	// create a new socket by hashing the address
-	c, ok := t.newSocket(addr, "listener")
-	if !ok {
-		return nil, errors.New("already listening on " + addr)
-	}
-
-	// set remote. it will be replaced by the first message received
-	c.remote = t.link.Remote()
-	// set local
-	c.local = addr
-
-	tl := &tunListener{
-		addr: addr,
-		// the accept channel
-		accept: make(chan *socket, 128),
-		// the channel to close
-		closed: make(chan bool),
-		// the connection
-		conn: c,
-		// the listener socket
-		socket: c,
-	}
-
-	// this kicks off the internal message processor
-	// for the listener so it can create pseudo sockets
-	// per session if they do not exist or pass messages
-	// to the existign sessions
-	go tl.process()
-
-	// return the listener
-	return tl, nil
-}

network/tunnel/listener.go

@@ -1,101 +0,0 @@
-package tunnel
-
-import (
-	"io"
-)
-
-type tunListener struct {
-	// address of the listener
-	addr string
-	// the accept channel
-	accept chan *socket
-	// the channel to close
-	closed chan bool
-	// the connection
-	conn Conn
-	// the listener socket
-	socket *socket
-}
-
-func (t *tunListener) process() {
-	// our connection map for session
-	conns := make(map[string]*socket)
-
-	for {
-		select {
-		case <-t.closed:
-			return
-		// receive a new message
-		case m := <-t.socket.recv:
-			// get a socket
-			sock, ok := conns[m.session]
-			if !ok {
-				// create a new socket session
-				sock = &socket{
-					// our tunnel id
-					id: m.id,
-					// the session id
-					session: m.session,
-					// close chan
-					closed: make(chan bool),
-					// recv called by the acceptor
-					recv: make(chan *message, 128),
-					// use the internal send buffer
-					send: t.socket.send,
-					// wait
-					wait: make(chan bool),
-				}
-
-				// first message
-				sock.recv <- m
-
-				// save the socket
-				conns[m.session] = sock
-
-				// send to accept chan
-				select {
-				case <-t.closed:
-					return
-				case t.accept <- sock:
-				}
-			}
-
-			// send this to the accept chan
-			select {
-			case <-sock.closed:
-				delete(conns, m.session)
-			case sock.recv <- m:
-			}
-		}
-	}
-}
-
-func (t *tunListener) Addr() string {
-	return t.addr
-}
-
-func (t *tunListener) Close() error {
-	select {
-	case <-t.closed:
-		return nil
-	default:
-		close(t.closed)
-	}
-	return nil
-}
-
-// Everytime accept is called we essentially block till we get a new connection
-func (t *tunListener) Accept() (Conn, error) {
-	select {
-	// if the socket is closed return
-	case <-t.closed:
-		return nil, io.EOF
-	// wait for a new connection
-	case c, ok := <-t.accept:
-		if !ok {
-			return nil, io.EOF
-		}
-		return c, nil
-	}
-	return nil, nil
-}

network/tunnel/socket.go

@@ -1,90 +0,0 @@
-package tunnel
-
-import (
-	"errors"
-
-	"github.com/micro/go-micro/transport"
-)
-
-// socket is our pseudo socket for transport.Socket
-type socket struct {
-	// socket id based on Micro-Tunnel
-	id string
-	// the session id based on Micro.Tunnel-Session
-	session string
-	// closed
-	closed chan bool
-	// remote addr
-	remote string
-	// local addr
-	local string
-	// send chan
-	send chan *message
-	// recv chan
-	recv chan *message
-	// wait until we have a connection
-	wait chan bool
-}
-
-// message is sent over the send channel
-type message struct {
-	// tunnel id
-	id string
-	// the session id
-	session string
-	// transport data
-	data *transport.Message
-}
-
-func (s *socket) Remote() string {
-	return s.remote
-}
-
-func (s *socket) Local() string {
-	return s.local
-}
-
-func (s *socket) Id() string {
-	return s.id
-}
-
-func (s *socket) Session() string {
-	return s.session
-}
-
-func (s *socket) Send(m *transport.Message) error {
-	select {
-	case <-s.closed:
-		return errors.New("socket is closed")
-	default:
-		// no op
-	}
-	// append to backlog
-	s.send <- &message{id: s.id, session: s.session, data: m}
-	return nil
-}
-
-func (s *socket) Recv(m *transport.Message) error {
-	select {
-	case <-s.closed:
-		return errors.New("socket is closed")
-	default:
-		// no op
-	}
-	// recv from backlog
-	msg := <-s.recv
-	// set message
-	*m = *msg.data
-	// return nil
-	return nil
-}
-
-func (s *socket) Close() error {
-	select {
-	case <-s.closed:
-		// no op
-	default:
-		close(s.closed)
-	}
-	return nil
-}

network/tunnel/tunnel.go

@@ -1,44 +0,0 @@
-// Package tunnel provides gre network tunnelling
-package tunnel
-
-import (
-	"github.com/micro/go-micro/network/link"
-	"github.com/micro/go-micro/transport"
-)
-
-// Tunnel creates a gre network tunnel on top of a link.
-// It establishes multiple streams using the Micro-Tunnel-Id header
-// and Micro-Tunnel-Session header. The tunnel id is a hash of
-// the address being requested.
-type Tunnel interface {
-	// Connect connects the tunnel
-	Connect() error
-	// Close closes the tunnel
-	Close() error
-	// Dial an endpoint
-	Dial(addr string) (Conn, error)
-	// Accept connections
-	Listen(addr string) (Listener, error)
-}
-
-// The listener provides similar constructs to the transport.Listener
-type Listener interface {
-	Addr() string
-	Close() error
-	Accept() (Conn, error)
-}
-
-// Conn is a connection dialed or accepted which includes the tunnel id and session
-type Conn interface {
-	// Specifies the tunnel id
-	Id() string
-	// The session
-	Session() string
-	// a transport socket
-	transport.Socket
-}
-
-// NewTunnel creates a new tunnel on top of a link
-func NewTunnel(l link.Link) Tunnel {
-	return newTunnel(l)
-}

network/tunnel/tunnel_test.go

@@ -1,113 +0,0 @@
-package tunnel
-
-import (
-	"testing"
-
-	"github.com/micro/go-micro/network/link"
-	"github.com/micro/go-micro/transport"
-)
-
-// testAccept will accept connections on the transport, create a new link and tunnel on top
-func testAccept(t *testing.T, l transport.Listener, wait chan bool) error {
-	// accept new connections on the transport
-	// establish a link and tunnel
-	return l.Accept(func(s transport.Socket) {
-		// convert the socket into a link
-		li := link.NewLink(
-			link.Socket(s),
-		)
-
-		// connect the link e.g start internal buffers
-		if err := li.Connect(); err != nil {
-			t.Fatal(err)
-		}
-
-		// create a new tunnel
-		tun := NewTunnel(li)
-
-		// connect the tunnel
-		if err := tun.Connect(); err != nil {
-			t.Fatal(err)
-		}
-
-		// listen on some virtual address
-		tl, err := tun.Listen("test-tunnel")
-		if err != nil {
-			t.Fatal(err)
-			return
-		}
-
-		// accept a connection
-		c, err := tl.Accept()
-		if err != nil {
-			t.Fatal(err)
-		}
-
-		// get a message
-		for {
-			m := new(transport.Message)
-			if err := c.Recv(m); err != nil {
-				t.Fatal(err)
-			}
-			close(wait)
-			return
-		}
-	})
-}
-
-// testSend will create a new link to an address and then a tunnel on top
-func testSend(t *testing.T, addr string) {
-	// create a new link
-	l := link.NewLink(
-		link.Address(addr),
-	)
-
-	// connect the link, this includes dialing
-	if err := l.Connect(); err != nil {
-		t.Fatal(err)
-	}
-
-	// create a tunnel on the link
-	tun := NewTunnel(l)
-
-	// connect the tunnel with the remote side
-	if err := tun.Connect(); err != nil {
-		t.Fatal(err)
-	}
-
-	// dial a new session
-	c, err := tun.Dial("test-tunnel")
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	m := transport.Message{
-		Header: map[string]string{
-			"test": "header",
-		},
-	}
-	if err := c.Send(&m); err != nil {
-		t.Fatal(err)
-	}
-}
-
-func TestTunnel(t *testing.T) {
-	// create a new listener
-	tr := transport.NewTransport()
-	l, err := tr.Listen(":0")
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer l.Close()
-
-	wait := make(chan bool)
-
-	// start accepting connections
-	go testAccept(t, l, wait)
-
-	// send a message
-	testSend(t, l.Addr())
-
-	// wait until message is received
-	<-wait
-}

plugin/default.go

@@ -0,0 +1,125 @@
+// Package plugin provides the ability to load plugins
+package plugin
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+	pg "plugin"
+	"strings"
+	"text/template"
+
+	"github.com/micro/go-micro/broker"
+	"github.com/micro/go-micro/client"
+	"github.com/micro/go-micro/client/selector"
+	"github.com/micro/go-micro/config/cmd"
+	"github.com/micro/go-micro/registry"
+	"github.com/micro/go-micro/server"
+	"github.com/micro/go-micro/transport"
+)
+
+type plugin struct{}
+
+// Init sets up the plugin
+func (p *plugin) Init(c *Config) error {
+	switch c.Type {
+	case "broker":
+		pg, ok := c.NewFunc.(func(...broker.Option) broker.Broker)
+		if !ok {
+			return fmt.Errorf("Invalid plugin %s", c.Name)
+		}
+		cmd.DefaultBrokers[c.Name] = pg
+	case "client":
+		pg, ok := c.NewFunc.(func(...client.Option) client.Client)
+		if !ok {
+			return fmt.Errorf("Invalid plugin %s", c.Name)
+		}
+		cmd.DefaultClients[c.Name] = pg
+	case "registry":
+		pg, ok := c.NewFunc.(func(...registry.Option) registry.Registry)
+		if !ok {
+			return fmt.Errorf("Invalid plugin %s", c.Name)
+		}
+		cmd.DefaultRegistries[c.Name] = pg
+
+	case "selector":
+		pg, ok := c.NewFunc.(func(...selector.Option) selector.Selector)
+		if !ok {
+			return fmt.Errorf("Invalid plugin %s", c.Name)
+		}
+		cmd.DefaultSelectors[c.Name] = pg
+	case "server":
+		pg, ok := c.NewFunc.(func(...server.Option) server.Server)
+		if !ok {
+			return fmt.Errorf("Invalid plugin %s", c.Name)
+		}
+		cmd.DefaultServers[c.Name] = pg
+	case "transport":
+		pg, ok := c.NewFunc.(func(...transport.Option) transport.Transport)
+		if !ok {
+			return fmt.Errorf("Invalid plugin %s", c.Name)
+		}
+		cmd.DefaultTransports[c.Name] = pg
+	default:
+		return fmt.Errorf("Unknown plugin type: %s for %s", c.Type, c.Name)
+	}
+
+	return nil
+}
+
+// Load loads a plugin created with `go build -buildmode=plugin`
+func (p *plugin) Load(path string) (*Config, error) {
+	plugin, err := pg.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	s, err := plugin.Lookup("Plugin")
+	if err != nil {
+		return nil, err
+	}
+	pl, ok := s.(*Config)
+	if !ok {
+		return nil, errors.New("could not cast Plugin object")
+	}
+	return pl, nil
+}
+
+// Generate creates a go file at the specified path.
+// You must use `go build -buildmode=plugin`to build it.
+func (p *plugin) Generate(path string, c *Config) error {
+	f, err := os.Create(path)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	t, err := template.New(c.Name).Parse(tmpl)
+	if err != nil {
+		return err
+	}
+	return t.Execute(f, c)
+}
+
+// Build generates a dso plugin using the go command `go build -buildmode=plugin`
+func (p *plugin) Build(path string, c *Config) error {
+	path = strings.TrimSuffix(path, ".so")
+
+	// create go file in tmp path
+	temp := os.TempDir()
+	base := filepath.Base(path)
+	goFile := filepath.Join(temp, base+".go")
+
+	// generate .go file
+	if err := p.Generate(goFile, c); err != nil {
+		return err
+	}
+	// remove .go file
+	defer os.Remove(goFile)
+
+	if err := os.MkdirAll(filepath.Dir(path), 0755); err != nil && !os.IsExist(err) {
+		return fmt.Errorf("Failed to create dir %s: %v", filepath.Dir(path), err)
+	}
+	cmd := exec.Command("go", "build", "-buildmode=plugin", "-o", path+".so", goFile)
+	return cmd.Run()
+}

plugin/plugin.go

@@ -0,0 +1,46 @@
+// Package plugin provides the ability to load plugins
+package plugin
+
+// Plugin is a plugin loaded from a file
+type Plugin interface {
+	// Initialise a plugin with the config
+	Init(c *Config) error
+	// Load loads a .so plugin at the given path
+	Load(path string) (*Config, error)
+	// Build a .so plugin with config at the path specified
+	Build(path string, c *Config) error
+}
+
+// Config is the plugin config
+type Config struct {
+	// Name of the plugin e.g rabbitmq
+	Name string
+	// Type of the plugin e.g broker
+	Type string
+	// Path specifies the import path
+	Path string
+	// NewFunc creates an instance of the plugin
+	NewFunc interface{}
+}
+
+var (
+	// Default plugin loader
+	DefaultPlugin = NewPlugin()
+)
+
+// NewPlugin creates a new plugin interface
+func NewPlugin() Plugin {
+	return &plugin{}
+}
+
+func Build(path string, c *Config) error {
+	return DefaultPlugin.Build(path, c)
+}
+
+func Load(path string) (*Config, error) {
+	return DefaultPlugin.Load(path)
+}
+
+func Init(c *Config) error {
+	return DefaultPlugin.Init(c)
+}

plugin/template.go

@@ -0,0 +1,20 @@
+package plugin
+
+var (
+	tmpl = `
+package main
+
+import (
+	"github.com/micro/go-micro/plugin"
+
+	"{{.Path}}"
+)
+
+var Plugin = plugin.Config{
+	Name: "{{.Name}}",
+	Type: "{{.Type}}",
+	Path: "{{.Path}}",
+	NewFunc: {{.Name}}.{{.NewFunc}},
+}
+`
+)

proxy/grpc/grpc.go

@@ -10,7 +10,8 @@ import (
 	"github.com/micro/go-micro/client/grpc"
 	"github.com/micro/go-micro/codec"
 	"github.com/micro/go-micro/config/options"
-	"github.com/micro/go-micro/network/proxy"
+	"github.com/micro/go-micro/errors"
+	"github.com/micro/go-micro/proxy"
 	"github.com/micro/go-micro/server"
 )
 
@@ -61,6 +62,10 @@ func readLoop(r server.Request, s client.Stream) error {
 	}
 }
 
+func (p *Proxy) SendRequest(ctx context.Context, req client.Request, rsp client.Response) error {
+	return errors.InternalServerError("go.micro.proxy.grpc", "SendRequest is unsupported")
+}
+
 // ServeRequest honours the server.Proxy interface
 func (p *Proxy) ServeRequest(ctx context.Context, req server.Request, rsp server.Response) error {
 	// set default client

proxy/http/http.go

@@ -10,9 +10,10 @@ import (
 	"net/url"
 	"path"
 
+	"github.com/micro/go-micro/client"
 	"github.com/micro/go-micro/config/options"
 	"github.com/micro/go-micro/errors"
-	"github.com/micro/go-micro/network/proxy"
+	"github.com/micro/go-micro/proxy"
 	"github.com/micro/go-micro/server"
 )
 
@@ -44,6 +45,10 @@ func getEndpoint(hdr map[string]string) string {
 	return ""
 }
 
+func (p *Proxy) SendRequest(ctx context.Context, req client.Request, rsp client.Response) error {
+	return errors.InternalServerError("go.micro.proxy.http", "SendRequest is unsupported")
+}
+
 // ServeRequest honours the server.Router interface
 func (p *Proxy) ServeRequest(ctx context.Context, req server.Request, rsp server.Response) error {
 	if p.Endpoint == "" {

proxy/mucp/mucp.go

@@ -5,15 +5,18 @@ import (
 	"context"
 	"fmt"
 	"io"
+	"sort"
 	"strings"
 	"sync"
+	"time"
 
 	"github.com/micro/go-micro/client"
 	"github.com/micro/go-micro/codec"
 	"github.com/micro/go-micro/codec/bytes"
 	"github.com/micro/go-micro/config/options"
-	"github.com/micro/go-micro/network/proxy"
-	"github.com/micro/go-micro/network/router"
+	"github.com/micro/go-micro/errors"
+	"github.com/micro/go-micro/proxy"
+	"github.com/micro/go-micro/router"
 	"github.com/micro/go-micro/server"
 )
 
@@ -26,9 +29,12 @@ type Proxy struct {
 	// Endpoint specifies the fixed service endpoint to call.
 	Endpoint string
 
-	// The client to use for outbound requests
+	// The client to use for outbound requests in the local network
 	Client client.Client
 
+	// Links are used for outbound requests not in the local network
+	Links map[string]client.Client
+
 	// The router for routes
 	Router router.Router
 
@@ -76,7 +82,7 @@ func readLoop(r server.Request, s client.Stream) error {
 }
 
 // toNodes returns a list of node addresses from given routes
-func toNodes(routes map[uint64]router.Route) []string {
+func toNodes(routes []router.Route) []string {
 	var nodes []string
 	for _, node := range routes {
 		address := node.Address
@@ -88,37 +94,63 @@ func toNodes(routes map[uint64]router.Route) []string {
 	return nodes
 }
 
-func (p *Proxy) getRoute(service string) ([]string, error) {
+func (p *Proxy) getLink(r router.Route) (client.Client, error) {
+	if r.Link == "local" || len(p.Links) == 0 {
+		return p.Client, nil
+	}
+	l, ok := p.Links[r.Link]
+	if !ok {
+		return nil, errors.InternalServerError("go.micro.proxy", "link not found")
+	}
+	return l, nil
+}
+
+func (p *Proxy) getRoute(service string) ([]router.Route, error) {
+	toSlice := func(r map[uint64]router.Route) []router.Route {
+		var routes []router.Route
+		for _, v := range r {
+			routes = append(routes, v)
+		}
+
+		// sort the routes in order of metric
+		sort.Slice(routes, func(i, j int) bool { return routes[i].Metric < routes[j].Metric })
+
+		return routes
+	}
+
 	// lookup the route cache first
 	p.Lock()
 	routes, ok := p.Routes[service]
 	if ok {
 		p.Unlock()
-		return toNodes(routes), nil
+		return toSlice(routes), nil
 	}
-	p.Routes[service] = make(map[uint64]router.Route)
 	p.Unlock()
 
-	// if the router is broken return error
-	if status := p.Router.Status(); status.Code == router.Error {
-		return nil, status.Error
-	}
-
 	// lookup the routes in the router
-	results, err := p.Router.Lookup(router.NewQuery(router.QueryService(service)))
+	results, err := p.Router.Lookup(router.QueryService(service))
 	if err != nil {
+		// check the status of the router
+		if status := p.Router.Status(); status.Code == router.Error {
+			return nil, status.Error
+		}
+		// otherwise return the error
 		return nil, err
 	}
 
 	// update the proxy cache
 	p.Lock()
 	for _, route := range results {
+		// create if does not exist
+		if _, ok := p.Routes[service]; !ok {
+			p.Routes[service] = make(map[uint64]router.Route)
+		}
 		p.Routes[service][route.Hash()] = route
 	}
 	routes = p.Routes[service]
 	p.Unlock()
 
-	return toNodes(routes), nil
+	return toSlice(routes), nil
 }
 
 // manageRouteCache applies action on a given route to Proxy route cache
@@ -130,9 +162,6 @@ func (p *Proxy) manageRouteCache(route router.Route, action string) error {
 		}
 		p.Routes[route.Service][route.Hash()] = route
 	case "delete":
-		if _, ok := p.Routes[route.Service]; !ok {
-			return fmt.Errorf("route not found")
-		}
 		delete(p.Routes[route.Service], route.Hash())
 	default:
 		return fmt.Errorf("unknown action: %s", action)
@@ -171,12 +200,31 @@ func (p *Proxy) watchRoutes() {
 	}
 }
 
+func (p *Proxy) SendRequest(ctx context.Context, req client.Request, rsp client.Response) error {
+	return errors.InternalServerError("go.micro.proxy", "SendRequest is unsupported")
+}
+
 // ServeRequest honours the server.Router interface
 func (p *Proxy) ServeRequest(ctx context.Context, req server.Request, rsp server.Response) error {
-	// service name
-	service := req.Service()
-	endpoint := req.Endpoint()
+	// determine if its local routing
+	var local bool
+	// address to call
 	var addresses []string
+	// routes
+	var routes []router.Route
+	// service name to call
+	service := req.Service()
+	// endpoint to call
+	endpoint := req.Endpoint()
+
+	if len(service) == 0 {
+		return errors.BadRequest("go.micro.proxy", "service name is blank")
+	}
+
+	// are we network routing or local routing
+	if len(p.Links) == 0 {
+		local = true
+	}
 
 	// call a specific backend endpoint either by name or address
 	if len(p.Endpoint) > 0 {
@@ -190,7 +238,7 @@ func (p *Proxy) ServeRequest(ctx context.Context, req server.Request, rsp server
 				return err
 			}
 			// set the address
-			addresses = addr
+			routes = addr
 			// set the name
 			service = p.Endpoint
 		}
@@ -201,16 +249,66 @@ func (p *Proxy) ServeRequest(ctx context.Context, req server.Request, rsp server
 		if err != nil {
 			return err
 		}
-		addresses = addr
+		routes = addr
 	}
 
-	var opts []client.CallOption
-
-	// set address if available
+	// if the address is already set just serve it
+	// TODO: figure it out if we should know to pick a link
 	if len(addresses) > 0 {
-		opts = append(opts, client.WithAddress(addresses...))
+		// serve the normal way
+		return p.serveRequest(ctx, p.Client, service, endpoint, req, rsp, client.WithAddress(addresses...))
 	}
 
+	// there's no links e.g we're local routing then just serve it with addresses
+	if local {
+		var opts []client.CallOption
+
+		// set address if available via routes or specific endpoint
+		if len(routes) > 0 {
+			addresses := toNodes(routes)
+			opts = append(opts, client.WithAddress(addresses...))
+		}
+
+		// serve the normal way
+		return p.serveRequest(ctx, p.Client, service, endpoint, req, rsp, opts...)
+	}
+
+	var gerr error
+
+	// we're routing globally with multiple links
+	// so we need to pick a link per route
+	for _, route := range routes {
+		// pick the link or error out
+		link, err := p.getLink(route)
+		if err != nil {
+			// ok let's try again
+			gerr = err
+			continue
+		}
+
+		// set the address to call
+		addresses := toNodes([]router.Route{route})
+
+		// do the request with the link
+		gerr = p.serveRequest(ctx, link, service, endpoint, req, rsp, client.WithAddress(addresses...))
+		// return on no error since we succeeded
+		if gerr == nil {
+			return nil
+		}
+
+		// return where the context deadline was exceeded
+		if gerr == context.Canceled || gerr == context.DeadlineExceeded {
+			return err
+		}
+
+		// otherwise attempt to do it all over again
+	}
+
+	// if we got here something went really badly wrong
+	return gerr
+}
+
+func (p *Proxy) serveRequest(ctx context.Context, link client.Client, service, endpoint string, req server.Request, rsp server.Response, opts ...client.CallOption) error {
 	// read initial request
 	body, err := req.Read()
 	if err != nil {
@@ -218,16 +316,33 @@ func (p *Proxy) ServeRequest(ctx context.Context, req server.Request, rsp server
 	}
 
 	// create new request with raw bytes body
-	creq := p.Client.NewRequest(service, endpoint, &bytes.Frame{body}, client.WithContentType(req.ContentType()))
+	creq := link.NewRequest(service, endpoint, &bytes.Frame{body}, client.WithContentType(req.ContentType()))
+
+	// not a stream so make a client.Call request
+	if !req.Stream() {
+		crsp := new(bytes.Frame)
+
+		// make a call to the backend
+		if err := link.Call(ctx, creq, crsp, opts...); err != nil {
+			return err
+		}
+
+		// write the response
+		if err := rsp.Write(crsp.Data); err != nil {
+			return err
+		}
+
+		return nil
+	}
 
 	// create new stream
-	stream, err := p.Client.Stream(ctx, creq, opts...)
+	stream, err := link.Stream(ctx, creq, opts...)
 	if err != nil {
 		return err
 	}
 	defer stream.Close()
 
-	// create client request read loop
+	// create client request read loop if streaming
 	go readLoop(req, stream)
 
 	// get raw response
@@ -283,6 +398,7 @@ func NewSingleHostProxy(endpoint string) *Proxy {
 // NewProxy returns a new proxy which will route based on mucp headers
 func NewProxy(opts ...options.Option) proxy.Proxy {
 	p := new(Proxy)
+	p.Links = map[string]client.Client{}
 	p.Options = options.NewOptions(opts...)
 	p.Options.Init(options.WithString("mucp"))
 
@@ -303,6 +419,12 @@ func NewProxy(opts ...options.Option) proxy.Proxy {
 		p.Client = client.DefaultClient
 	}
 
+	// get client
+	links, ok := p.Options.Values().Get("proxy.links")
+	if ok {
+		p.Links = links.(map[string]client.Client)
+	}
+
 	// get router
 	r, ok := p.Options.Values().Get("proxy.router")
 	if ok {
@@ -319,7 +441,16 @@ func NewProxy(opts ...options.Option) proxy.Proxy {
 
 	// watch router service routes
 	p.errChan = make(chan error, 1)
-	go p.watchRoutes()
+
+	go func() {
+		// continuously attempt to watch routes
+		for {
+			// watch the routes
+			p.watchRoutes()
+			// in case of failure just wait a second
+			time.Sleep(time.Second)
+		}
+	}()
 
 	return p
 }

proxy/proxy.go

@@ -6,13 +6,15 @@ import (
 
 	"github.com/micro/go-micro/client"
 	"github.com/micro/go-micro/config/options"
-	"github.com/micro/go-micro/network/router"
+	"github.com/micro/go-micro/router"
 	"github.com/micro/go-micro/server"
 )
 
 // Proxy can be used as a proxy server for go-micro services
 type Proxy interface {
 	options.Options
+	// SendRequest honours the client.Router interface
+	SendRequest(context.Context, client.Request, client.Response) error
 	// ServeRequest honours the server.Router interface
 	ServeRequest(context.Context, server.Request, server.Response) error
 }
@@ -35,3 +37,20 @@ func WithClient(c client.Client) options.Option {
 func WithRouter(r router.Router) options.Option {
 	return options.WithValue("proxy.router", r)
 }
+
+// WithLink sets a link for outbound requests
+func WithLink(name string, c client.Client) options.Option {
+	return func(o *options.Values) error {
+		var links map[string]client.Client
+		v, ok := o.Get("proxy.links")
+		if ok {
+			links = v.(map[string]client.Client)
+		} else {
+			links = map[string]client.Client{}
+		}
+		links[name] = c
+		// save the links
+		o.Set("proxy.links", links)
+		return nil
+	}
+}

registry/cache/cache.go

@@ -36,7 +36,13 @@ type cache struct {
 	ttls    map[string]time.Time
 	watched map[string]bool
 
+	// used to stop the cache
 	exit chan bool
+
+	// status of the registry
+	// used to hold onto the cache
+	// in failure state
+	status error
 }
 
 var (
@@ -50,6 +56,18 @@ func backoff(attempts int) time.Duration {
 	return time.Duration(math.Pow(10, float64(attempts))) * time.Millisecond
 }
 
+func (c *cache) getStatus() error {
+	c.RLock()
+	defer c.RUnlock()
+	return c.status
+}
+
+func (c *cache) setStatus(err error) {
+	c.Lock()
+	c.status = err
+	c.Unlock()
+}
+
 // isValid checks if the service is valid
 func (c *cache) isValid(services []*registry.Service, ttl time.Time) bool {
 	// no services exist
@@ -81,6 +99,11 @@ func (c *cache) quit() bool {
 }
 
 func (c *cache) del(service string) {
+	// don't blow away cache in error state
+	if err := c.status; err != nil {
+		return
+	}
+	// otherwise delete entries
 	delete(c.cache, service)
 	delete(c.ttls, service)
 }
@@ -93,25 +116,38 @@ func (c *cache) get(service string) ([]*registry.Service, error) {
 	services := c.cache[service]
 	// get cache ttl
 	ttl := c.ttls[service]
+	// make a copy
+	cp := registry.Copy(services)
 
 	// got services && within ttl so return cache
-	if c.isValid(services, ttl) {
-		// make a copy
-		cp := registry.Copy(services)
-		// unlock the read
+	if c.isValid(cp, ttl) {
 		c.RUnlock()
-		// return servics
+		// return services
 		return cp, nil
 	}
 
 	// get does the actual request for a service and cache it
-	get := func(service string) ([]*registry.Service, error) {
+	get := func(service string, cached []*registry.Service) ([]*registry.Service, error) {
 		// ask the registry
 		services, err := c.Registry.GetService(service)
 		if err != nil {
+			// check the cache
+			if len(cached) > 0 {
+				// set the error status
+				c.setStatus(err)
+
+				// return the stale cache
+				return cached, nil
+			}
+			// otherwise return error
 			return nil, err
 		}
 
+		// reset the status
+		if err := c.getStatus(); err != nil {
+			c.setStatus(nil)
+		}
+
 		// cache results
 		c.Lock()
 		c.set(service, registry.Copy(services))
@@ -129,7 +165,7 @@ func (c *cache) get(service string) ([]*registry.Service, error) {
 	c.RUnlock()
 
 	// get and return services
-	return get(service)
+	return get(service, cp)
 }
 
 func (c *cache) set(service string, services []*registry.Service) {
@@ -283,6 +319,7 @@ func (c *cache) run(service string) {
 			}
 
 			d := backoff(a)
+			c.setStatus(err)
 
 			if a > 3 {
 				log.Log("rcache: ", err, " backing off ", d)
@@ -305,6 +342,7 @@ func (c *cache) run(service string) {
 			}
 
 			d := backoff(b)
+			c.setStatus(err)
 
 			if b > 3 {
 				log.Log("rcache: ", err, " backing off ", d)
@@ -325,20 +363,36 @@ func (c *cache) run(service string) {
 // watch loops the next event and calls update
 // it returns if there's an error
 func (c *cache) watch(w registry.Watcher) error {
-	defer w.Stop()
+	// used to stop the watch
+	stop := make(chan bool)
 
 	// manage this loop
 	go func() {
+		defer w.Stop()
+
+		select {
 		// wait for exit
-		<-c.exit
-		w.Stop()
+		case <-c.exit:
+			return
+		// we've been stopped
+		case <-stop:
+			return
+		}
 	}()
 
 	for {
 		res, err := w.Next()
 		if err != nil {
+			close(stop)
 			return err
 		}
+
+		// reset the error status since we succeeded
+		if err := c.getStatus(); err != nil {
+			// reset status
+			c.setStatus(nil)
+		}
+
 		c.update(res)
 	}
 }
@@ -369,7 +423,7 @@ func (c *cache) Stop() {
 }
 
 func (c *cache) String() string {
-	return "rcache"
+	return "cache"
 }
 
 // New returns a new cache

registry/consul/consul.go

@@ -13,14 +13,17 @@ import (
 
 	consul "github.com/hashicorp/consul/api"
 	"github.com/micro/go-micro/registry"
+	mnet "github.com/micro/go-micro/util/net"
 	hash "github.com/mitchellh/hashstructure"
 )
 
 type consulRegistry struct {
-	Address string
-	Client  *consul.Client
+	Address []string
 	opts    registry.Options
 
+	client *consul.Client
+	config *consul.Config
+
 	// connect enabled
 	connect bool
 
@@ -95,24 +98,33 @@ func configure(c *consulRegistry, opts ...registry.Option) {
 	}
 
 	// check if there are any addrs
-	if len(c.opts.Addrs) > 0 {
-		addr, port, err := net.SplitHostPort(c.opts.Addrs[0])
+	var addrs []string
+
+	// iterate the options addresses
+	for _, address := range c.opts.Addrs {
+		// check we have a port
+		addr, port, err := net.SplitHostPort(address)
 		if ae, ok := err.(*net.AddrError); ok && ae.Err == "missing port in address" {
 			port = "8500"
-			addr = c.opts.Addrs[0]
-			config.Address = fmt.Sprintf("%s:%s", addr, port)
+			addr = address
+			addrs = append(addrs, net.JoinHostPort(addr, port))
 		} else if err == nil {
-			config.Address = fmt.Sprintf("%s:%s", addr, port)
+			addrs = append(addrs, net.JoinHostPort(addr, port))
 		}
 	}
 
+	// set the addrs
+	if len(addrs) > 0 {
+		c.Address = addrs
+		config.Address = c.Address[0]
+	}
+
 	if config.HttpClient == nil {
 		config.HttpClient = new(http.Client)
 	}
 
 	// requires secure connection?
 	if c.opts.Secure || c.opts.TLSConfig != nil {
-
 		config.Scheme = "https"
 		// We're going to support InsecureSkipVerify
 		config.HttpClient.Transport = newTransport(c.opts.TLSConfig)
@@ -123,12 +135,14 @@ func configure(c *consulRegistry, opts ...registry.Option) {
 		config.HttpClient.Timeout = c.opts.Timeout
 	}
 
-	// create the client
-	client, _ := consul.NewClient(config)
+	// set the config
+	c.config = config
 
-	// set address/client
-	c.Address = config.Address
-	c.Client = client
+	// remove client
+	c.client = nil
+
+	// setup the client
+	c.Client()
 }
 
 func (c *consulRegistry) Init(opts ...registry.Option) error {
@@ -148,7 +162,7 @@ func (c *consulRegistry) Deregister(s *registry.Service) error {
 	c.Unlock()
 
 	node := s.Nodes[0]
-	return c.Client.Agent().ServiceDeregister(node.Id)
+	return c.Client().Agent().ServiceDeregister(node.Id)
 }
 
 func (c *consulRegistry) Register(s *registry.Service, opts ...registry.RegisterOption) error {
@@ -193,7 +207,7 @@ func (c *consulRegistry) Register(s *registry.Service, opts ...registry.Register
 			if time.Since(lastChecked) <= getDeregisterTTL(regInterval) {
 				return nil
 			}
-			services, _, err := c.Client.Health().Checks(s.Name, c.queryOptions)
+			services, _, err := c.Client().Health().Checks(s.Name, c.queryOptions)
 			if err == nil {
 				for _, v := range services {
 					if v.ServiceID == node.Id {
@@ -204,7 +218,7 @@ func (c *consulRegistry) Register(s *registry.Service, opts ...registry.Register
 		} else {
 			// if the err is nil we're all good, bail out
 			// if not, we don't know what the state is, so full re-register
-			if err := c.Client.Agent().PassTTL("service:"+node.Id, ""); err == nil {
+			if err := c.Client().Agent().PassTTL("service:"+node.Id, ""); err == nil {
 				return nil
 			}
 		}
@@ -237,6 +251,9 @@ func (c *consulRegistry) Register(s *registry.Service, opts ...registry.Register
 	}
 
 	host, pt, _ := net.SplitHostPort(node.Address)
+	if host == "" {
+		host = node.Address
+	}
 	port, _ := strconv.Atoi(pt)
 
 	// register the service
@@ -256,7 +273,7 @@ func (c *consulRegistry) Register(s *registry.Service, opts ...registry.Register
 		}
 	}
 
-	if err := c.Client.Agent().ServiceRegister(asr); err != nil {
+	if err := c.Client().Agent().ServiceRegister(asr); err != nil {
 		return err
 	}
 
@@ -272,7 +289,7 @@ func (c *consulRegistry) Register(s *registry.Service, opts ...registry.Register
 	}
 
 	// pass the healthcheck
-	return c.Client.Agent().PassTTL("service:"+node.Id, "")
+	return c.Client().Agent().PassTTL("service:"+node.Id, "")
 }
 
 func (c *consulRegistry) GetService(name string) ([]*registry.Service, error) {
@@ -281,9 +298,9 @@ func (c *consulRegistry) GetService(name string) ([]*registry.Service, error) {
 
 	// if we're connect enabled only get connect services
 	if c.connect {
-		rsp, _, err = c.Client.Health().Connect(name, "", false, c.queryOptions)
+		rsp, _, err = c.Client().Health().Connect(name, "", false, c.queryOptions)
 	} else {
-		rsp, _, err = c.Client.Health().Service(name, "", false, c.queryOptions)
+		rsp, _, err = c.Client().Health().Service(name, "", false, c.queryOptions)
 	}
 	if err != nil {
 		return nil, err
@@ -338,7 +355,7 @@ func (c *consulRegistry) GetService(name string) ([]*registry.Service, error) {
 
 		svc.Nodes = append(svc.Nodes, &registry.Node{
 			Id:       id,
-			Address:  fmt.Sprintf("%s:%d", address, s.Service.Port),
+			Address:  mnet.HostPort(address, s.Service.Port),
 			Metadata: decodeMetadata(s.Service.Tags),
 		})
 	}
@@ -351,7 +368,7 @@ func (c *consulRegistry) GetService(name string) ([]*registry.Service, error) {
 }
 
 func (c *consulRegistry) ListServices() ([]*registry.Service, error) {
-	rsp, _, err := c.Client.Catalog().Services(c.queryOptions)
+	rsp, _, err := c.Client().Catalog().Services(c.queryOptions)
 	if err != nil {
 		return nil, err
 	}
@@ -377,6 +394,36 @@ func (c *consulRegistry) Options() registry.Options {
 	return c.opts
 }
 
+func (c *consulRegistry) Client() *consul.Client {
+	if c.client != nil {
+		return c.client
+	}
+
+	for _, addr := range c.Address {
+		// set the address
+		c.config.Address = addr
+
+		// create a new client
+		tmpClient, _ := consul.NewClient(c.config)
+
+		// test the client
+		_, err := tmpClient.Agent().Host()
+		if err != nil {
+			continue
+		}
+
+		// set the client
+		c.client = tmpClient
+		return c.client
+	}
+
+	// set the default
+	c.client, _ = consul.NewClient(c.config)
+
+	// return the client
+	return c.client
+}
+
 func NewRegistry(opts ...registry.Option) registry.Registry {
 	cr := &consulRegistry{
 		opts:        registry.Options{},

registry/consul/registry_test.go

@@ -50,22 +50,24 @@ func newConsulTestRegistry(r *mockRegistry) (*consulRegistry, func()) {
 	}
 	cfg := consul.DefaultConfig()
 	cfg.Address = l.Addr().String()
-	cl, _ := consul.NewClient(cfg)
 
 	go newMockServer(r, l)
 
-	return &consulRegistry{
-			Address:     cfg.Address,
-			Client:      cl,
-			opts:        registry.Options{},
-			register:    make(map[string]uint64),
-			lastChecked: make(map[string]time.Time),
-			queryOptions: &consul.QueryOptions{
-				AllowStale: true,
-			},
-		}, func() {
-			l.Close()
-		}
+	var cr = &consulRegistry{
+		config:      cfg,
+		Address:     []string{cfg.Address},
+		opts:        registry.Options{},
+		register:    make(map[string]uint64),
+		lastChecked: make(map[string]time.Time),
+		queryOptions: &consul.QueryOptions{
+			AllowStale: true,
+		},
+	}
+	cr.Client()
+
+	return cr, func() {
+		l.Close()
+	}
 }
 
 func newServiceList(svc []*consul.ServiceEntry) []byte {