Don't set stream unless its true

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

.travis.yml

@@ -1,8 +1,8 @@
 language: go
 go:
-- 1.12.x
+- 1.13.x
 env:
-  - GO111MODULE=on
+  - GO111MODULE=on IN_TRAVIS_CI=yes
 notifications:
   slack:
     secure: aEvhLbhujaGaKSrOokiG3//PaVHTIrc3fBpoRbCRqfZpyq6WREoapJJhF+tIpWWOwaC9GmChbD6aHo/jMUgwKXVyPSaNjiEL87YzUUpL8B2zslNp1rgfTg/LrzthOx3Q1TYwpaAl3to0fuHUVFX4yMeC2vuThq7WSXgMMxFCtbc=

README.md

@@ -20,8 +20,7 @@ Go Micro abstracts away the details of distributed systems. Here are the main fe
 
 - **Service Discovery** - Automatic service registration and name resolution. Service discovery is at the core of micro service 
 development. When service A needs to speak to service B it needs the location of that service. The default discovery mechanism is 
-multicast DNS (mdns), a zeroconf system. You can optionally set gossip using the SWIM protocol for p2p networks or consul for a
-resilient cloud-native setup.
+multicast DNS (mdns), a zeroconf system.
 
 - **Load Balancing** - Client side load balancing built on service discovery. Once we have the addresses of any number of instances 
 of a service we now need a way to decide which node to route to. We use random hashed load balancing to provide even distribution 

api/handler/api/util_test.go

@@ -8,7 +8,7 @@ import (
 
 func TestRequestToProto(t *testing.T) {
 	testData := []*http.Request{
-		&http.Request{
+		{
 			Method: "GET",
 			Header: http.Header{
 				"Header": []string{"test"},

api/handler/http/http_test.go

@@ -27,7 +27,7 @@ func testHttp(t *testing.T, path, service, ns string) {
 	s := &registry.Service{
 		Name: service,
 		Nodes: []*registry.Node{
-			&registry.Node{
+			{
 				Id:      service + "-1",
 				Address: l.Addr().String(),
 			},

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 +1,58 @@
+// 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 {
+	opts := acme.DefaultOptions()
+
+	for _, o := range options {
+		o(&opts)
+	}
+
+	if opts.Cache != nil {
+		if _, ok := opts.Cache.(certmagic.Storage); !ok {
+			log.Fatal("ACME: cache provided doesn't implement certmagic's Storage interface")
+		}
+	}
+
+	return &certmagicProvider{
+		opts: opts,
+	}
+}

api/server/acme/certmagic/certmagic_test.go

@@ -0,0 +1,224 @@
+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"
+	cfstore "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.Fatal(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.Fatal(err.Error())
+	}
+
+	l, err = New(acme.AcceptToS(true),
+		acme.CA(acme.LetsEncryptStagingCA),
+		acme.ChallengeProvider(p),
+	).NewListener()
+
+	if err != nil {
+		t.Fatal(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 := cfstore.NewStore(
+		cfstore.Token(apiToken),
+		cfstore.Account(accountID),
+		cfstore.Namespace(kvID),
+	)
+	s = &storage{
+		lock:  memory.NewLock(),
+		store: st,
+	}
+
+	// Test Lock
+	if err := s.Lock("test"); err != nil {
+		t.Fatal(err)
+	}
+
+	// Test Unlock
+	if err := s.Unlock("test"); err != nil {
+		t.Fatal(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.Fatal(err.Error())
+		}
+	}
+
+	// Test Load
+	for _, d := range testdata {
+		if value, err := s.Load(d.key); err != nil {
+			t.Fatal(err.Error())
+		} else {
+			if !reflect.DeepEqual(value, d.value) {
+				t.Fatalf("Load %s: expected %v, got %v", d.key, d.value, value)
+			}
+		}
+	}
+
+	// Test Exists
+	for _, d := range testdata {
+		if !s.Exists(d.key) {
+			t.Fatalf("%s should exist, but doesn't\n", d.key)
+		}
+	}
+
+	// Test List
+	if list, err := s.List("/", true); err != nil {
+		t.Fatal(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.Fatalf("List: Expected %v, got %v\n", expected, list)
+		}
+	}
+	if list, err := s.List("/foo", false); err != nil {
+		t.Fatal(err.Error())
+	} else {
+		sort.Strings(list)
+		expected := []string{"/foo/a", "/foo/b", "/foo/bar", "/foo/c", "/foo/d"}
+		if !reflect.DeepEqual(expected, list) {
+			t.Fatalf("List: expected %s, got %s\n", expected, list)
+		}
+	}
+
+	// Test Stat
+	for _, d := range testdata {
+		info, err := s.Stat(d.key)
+		if err != nil {
+			t.Fatal(err.Error())
+		} else {
+			if info.Key != d.key {
+				t.Fatalf("Stat().Key: expected %s, got %s\n", d.key, info.Key)
+			}
+			if info.Size != int64(len(d.value)) {
+				t.Fatalf("Stat().Size: expected %d, got %d\n", len(d.value), info.Size)
+			}
+			if time.Since(info.Modified) > time.Minute {
+				t.Fatalf("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.Fatal(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 := cfstore.NewStore(
+		cfstore.Token(apiToken),
+		cfstore.Account(accountID),
+		cfstore.Namespace(kvID),
+	)
+	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.List()
+	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
+	}
+}
+
+// DefaultOptions uses the Let's Encrypt Production CA, with DNS Challenge disabled.
+func DefaultOptions() Options {
+	return Options{
+		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/common_test.go

@@ -7,7 +7,7 @@ import (
 var (
 	// mock data
 	testData = map[string][]*registry.Service{
-		"foo": []*registry.Service{
+		"foo": {
 			{
 				Name:    "foo",
 				Version: "1.0.0",

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
@@ -555,8 +560,24 @@ func (h *httpBroker) Publish(topic string, msg *Message, opts ...PublishOption)
 
 	srv := func(s []*registry.Service, b []byte) {
 		for _, service := range s {
+			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)
+			}
+
 			// only process if we have nodes
-			if len(service.Nodes) == 0 {
+			if len(nodes) == 0 {
 				continue
 			}
 
@@ -566,7 +587,7 @@ func (h *httpBroker) Publish(topic string, msg *Message, opts ...PublishOption)
 				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/http_broker_test.go

@@ -125,7 +125,7 @@ func pub(be *testing.B, c int) {
 
 	for i := 0; i < c; i++ {
 		go func() {
-			for _ = range ch {
+			for range ch {
 				if err := b.Publish(topic, msg); err != nil {
 					be.Fatalf("Unexpected publish error: %v", err)
 				}

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/common_test.go

@@ -7,7 +7,7 @@ import (
 var (
 	// mock data
 	testData = map[string][]*registry.Service{
-		"foo": []*registry.Service{
+		"foo": {
 			{
 				Name:    "foo",
 				Version: "1.0.0",

client/grpc/grpc.go

@@ -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))
 	}
@@ -514,6 +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/grpc_test.go

@@ -42,7 +42,7 @@ func TestGRPCClient(t *testing.T) {
 		Name:    "helloworld",
 		Version: "test",
 		Nodes: []*registry.Node{
-			&registry.Node{
+			{
 				Id:      "test-1",
 				Address: l.Addr().String(),
 			},

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/rpc_client.go

@@ -220,7 +220,7 @@ func (r *rpcClient) stream(ctx context.Context, node *registry.Node, req Request
 		dOpts = append(dOpts, transport.WithTimeout(opts.DialTimeout))
 	}
 
-	c, err := r.pool.Get(address, dOpts...)
+	c, err := r.opts.Transport.Dial(address, dOpts...)
 	if err != nil {
 		return nil, errors.InternalServerError("go.micro.client", "connection error: %v", err)
 	}
@@ -254,7 +254,7 @@ func (r *rpcClient) stream(ctx context.Context, node *registry.Node, req Request
 		// signal the end of stream,
 		sendEOS: true,
 		// release func
-		release: func(err error) { r.pool.Release(c, err) },
+		release: func(err error) { c.Close() },
 	}
 
 	// wait for error response

client/rpc_client_test.go

@@ -143,7 +143,7 @@ func TestCallWrapper(t *testing.T) {
 		Name:    service,
 		Version: "latest",
 		Nodes: []*registry.Node{
-			&registry.Node{
+			{
 				Id:      id,
 				Address: address,
 			},

client/selector/common_test.go

@@ -7,7 +7,7 @@ import (
 var (
 	// mock data
 	testData = map[string][]*registry.Service{
-		"foo": []*registry.Service{
+		"foo": {
 			{
 				Name:    "foo",
 				Version: "1.0.0",

client/selector/dns/dns.go

@@ -72,7 +72,7 @@ func (d *dnsSelector) Select(service string, opts ...selector.SelectOption) (sel
 	}
 
 	services := []*registry.Service{
-		&registry.Service{
+		{
 			Name:  service,
 			Nodes: nodes,
 		},

client/selector/filter_test.go

@@ -14,20 +14,20 @@ func TestFilterEndpoint(t *testing.T) {
 	}{
 		{
 			services: []*registry.Service{
-				&registry.Service{
+				{
 					Name:    "test",
 					Version: "1.0.0",
 					Endpoints: []*registry.Endpoint{
-						&registry.Endpoint{
+						{
 							Name: "Foo.Bar",
 						},
 					},
 				},
-				&registry.Service{
+				{
 					Name:    "test",
 					Version: "1.1.0",
 					Endpoints: []*registry.Endpoint{
-						&registry.Endpoint{
+						{
 							Name: "Baz.Bar",
 						},
 					},
@@ -38,20 +38,20 @@ func TestFilterEndpoint(t *testing.T) {
 		},
 		{
 			services: []*registry.Service{
-				&registry.Service{
+				{
 					Name:    "test",
 					Version: "1.0.0",
 					Endpoints: []*registry.Endpoint{
-						&registry.Endpoint{
+						{
 							Name: "Foo.Bar",
 						},
 					},
 				},
-				&registry.Service{
+				{
 					Name:    "test",
 					Version: "1.1.0",
 					Endpoints: []*registry.Endpoint{
-						&registry.Endpoint{
+						{
 							Name: "Foo.Bar",
 						},
 					},
@@ -95,11 +95,11 @@ func TestFilterLabel(t *testing.T) {
 	}{
 		{
 			services: []*registry.Service{
-				&registry.Service{
+				{
 					Name:    "test",
 					Version: "1.0.0",
 					Nodes: []*registry.Node{
-						&registry.Node{
+						{
 							Id:      "test-1",
 							Address: "localhost",
 							Metadata: map[string]string{
@@ -108,11 +108,11 @@ func TestFilterLabel(t *testing.T) {
 						},
 					},
 				},
-				&registry.Service{
+				{
 					Name:    "test",
 					Version: "1.1.0",
 					Nodes: []*registry.Node{
-						&registry.Node{
+						{
 							Id:      "test-2",
 							Address: "localhost",
 							Metadata: map[string]string{
@@ -127,21 +127,21 @@ func TestFilterLabel(t *testing.T) {
 		},
 		{
 			services: []*registry.Service{
-				&registry.Service{
+				{
 					Name:    "test",
 					Version: "1.0.0",
 					Nodes: []*registry.Node{
-						&registry.Node{
+						{
 							Id:      "test-1",
 							Address: "localhost",
 						},
 					},
 				},
-				&registry.Service{
+				{
 					Name:    "test",
 					Version: "1.1.0",
 					Nodes: []*registry.Node{
-						&registry.Node{
+						{
 							Id:      "test-2",
 							Address: "localhost",
 						},
@@ -187,11 +187,11 @@ func TestFilterVersion(t *testing.T) {
 	}{
 		{
 			services: []*registry.Service{
-				&registry.Service{
+				{
 					Name:    "test",
 					Version: "1.0.0",
 				},
-				&registry.Service{
+				{
 					Name:    "test",
 					Version: "1.1.0",
 				},
@@ -201,11 +201,11 @@ func TestFilterVersion(t *testing.T) {
 		},
 		{
 			services: []*registry.Service{
-				&registry.Service{
+				{
 					Name:    "test",
 					Version: "1.0.0",
 				},
-				&registry.Service{
+				{
 					Name:    "test",
 					Version: "1.1.0",
 				},

client/selector/router/router.go

@@ -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
@@ -101,7 +101,7 @@ func (r *routerSelector) getRoutes(service string) ([]router.Route, error) {
 		return nil, selector.ErrNoneAvailable
 	}
 
-	var routes []router.Route
+	routes := make([]router.Route, 0, len(pbRoutes.Routes))
 
 	// convert from pb to []*router.Route
 	for _, r := range pbRoutes.Routes {
@@ -111,7 +111,7 @@ func (r *routerSelector) getRoutes(service string) ([]router.Route, error) {
 			Gateway: r.Gateway,
 			Network: r.Network,
 			Link:    r.Link,
-			Metric:  int(r.Metric),
+			Metric:  r.Metric,
 		})
 	}
 

client/selector/strategy.go

@@ -14,7 +14,7 @@ func init() {
 
 // Random is a random strategy algorithm for node selection
 func Random(services []*registry.Service) Next {
-	var nodes []*registry.Node
+	nodes := make([]*registry.Node, 0, len(services))
 
 	for _, service := range services {
 		nodes = append(nodes, service.Nodes...)

client/selector/strategy_test.go

@@ -8,29 +8,29 @@ import (
 
 func TestStrategies(t *testing.T) {
 	testData := []*registry.Service{
-		&registry.Service{
+		{
 			Name:    "test1",
 			Version: "latest",
 			Nodes: []*registry.Node{
-				&registry.Node{
+				{
 					Id:      "test1-1",
 					Address: "10.0.0.1:1001",
 				},
-				&registry.Node{
+				{
 					Id:      "test1-2",
 					Address: "10.0.0.2:1002",
 				},
 			},
 		},
-		&registry.Service{
+		{
 			Name:    "test1",
 			Version: "default",
 			Nodes: []*registry.Node{
-				&registry.Node{
+				{
 					Id:      "test1-3",
 					Address: "10.0.0.3:1003",
 				},
-				&registry.Node{
+				{
 					Id:      "test1-4",
 					Address: "10.0.0.4:1004",
 				},

common_test.go

@@ -7,7 +7,7 @@ import (
 var (
 	// mock data
 	testData = map[string][]*registry.Service{
-		"foo": []*registry.Service{
+		"foo": {
 			{
 				Name:    "foo",
 				Version: "1.0.0",

config/cmd/cmd.go

@@ -23,13 +23,14 @@ 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"
@@ -43,6 +44,10 @@ import (
 	thttp "github.com/micro/go-micro/transport/http"
 	tmem "github.com/micro/go-micro/transport/memory"
 	"github.com/micro/go-micro/transport/quic"
+
+	// runtimes
+	"github.com/micro/go-micro/runtime"
+	"github.com/micro/go-micro/runtime/kubernetes"
 )
 
 type Cmd interface {
@@ -95,11 +100,13 @@ 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{
@@ -148,16 +155,27 @@ var (
 			EnvVar: "MICRO_BROKER_ADDRESS",
 			Usage:  "Comma-separated list of broker addresses",
 		},
+		cli.StringFlag{
+			Name:   "profile",
+			Usage:  "Debug profiler for cpu and memory stats",
+			EnvVar: "MICRO_DEBUG_PROFILE",
+		},
 		cli.StringFlag{
 			Name:   "registry",
 			EnvVar: "MICRO_REGISTRY",
-			Usage:  "Registry for discovery. consul, mdns",
+			Usage:  "Registry for discovery. etcd, mdns",
 		},
 		cli.StringFlag{
 			Name:   "registry_address",
 			EnvVar: "MICRO_REGISTRY_ADDRESS",
 			Usage:  "Comma-separated list of registry addresses",
 		},
+		cli.StringFlag{
+			Name:   "runtime",
+			Usage:  "Runtime for building and running services e.g local, kubernetes",
+			EnvVar: "MICRO_RUNTIME",
+			Value:  "local",
+		},
 		cli.StringFlag{
 			Name:   "selector",
 			EnvVar: "MICRO_SELECTOR",
@@ -176,9 +194,11 @@ 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{
@@ -188,10 +208,11 @@ 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,
+		"etcd":              etcd.NewRegistry,
+		"mdns":              mdns.NewRegistry,
+		"memory":            rmem.NewRegistry,
 	}
 
 	DefaultSelectors = map[string]func(...selector.Option) selector.Selector{
@@ -215,6 +236,11 @@ var (
 		"quic":   quic.NewTransport,
 	}
 
+	DefaultRuntimes = map[string]func(...runtime.Option) runtime.Runtime{
+		"local":      runtime.NewRuntime,
+		"kubernetes": kubernetes.NewRuntime,
+	}
+
 	// used for default selection as the fall back
 	defaultClient    = "rpc"
 	defaultServer    = "rpc"
@@ -222,6 +248,7 @@ var (
 	defaultRegistry  = "mdns"
 	defaultSelector  = "registry"
 	defaultTransport = "http"
+	defaultRuntime   = "local"
 )
 
 func init() {
@@ -241,6 +268,7 @@ func newCmd(opts ...Option) Cmd {
 		Server:    &server.DefaultServer,
 		Selector:  &selector.DefaultSelector,
 		Transport: &transport.DefaultTransport,
+		Runtime:   &runtime.DefaultRuntime,
 
 		Brokers:    DefaultBrokers,
 		Clients:    DefaultClients,
@@ -248,6 +276,7 @@ func newCmd(opts ...Option) Cmd {
 		Selectors:  DefaultSelectors,
 		Servers:    DefaultServers,
 		Transports: DefaultTransports,
+		Runtimes:   DefaultRuntimes,
 	}
 
 	for _, o := range opts {
@@ -288,6 +317,16 @@ func (c *cmd) Before(ctx *cli.Context) error {
 	var serverOpts []server.Option
 	var clientOpts []client.Option
 
+	// Set the runtime
+	if name := ctx.String("runtime"); len(name) > 0 {
+		r, ok := c.opts.Runtimes[name]
+		if !ok {
+			return fmt.Errorf("Unsupported runtime: %s", name)
+		}
+
+		*c.opts.Runtime = r()
+	}
+
 	// Set the client
 	if name := ctx.String("client"); len(name) > 0 {
 		// only change if we have the client and type differs
@@ -417,11 +456,11 @@ 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/cmd/options.go

@@ -7,6 +7,7 @@ import (
 	"github.com/micro/go-micro/client"
 	"github.com/micro/go-micro/client/selector"
 	"github.com/micro/go-micro/registry"
+	"github.com/micro/go-micro/runtime"
 	"github.com/micro/go-micro/server"
 	"github.com/micro/go-micro/transport"
 )
@@ -24,6 +25,7 @@ type Options struct {
 	Transport *transport.Transport
 	Client    *client.Client
 	Server    *server.Server
+	Runtime   *runtime.Runtime
 
 	Brokers    map[string]func(...broker.Option) broker.Broker
 	Clients    map[string]func(...client.Option) client.Client
@@ -31,6 +33,7 @@ type Options struct {
 	Selectors  map[string]func(...selector.Option) selector.Selector
 	Servers    map[string]func(...server.Option) server.Server
 	Transports map[string]func(...transport.Option) transport.Transport
+	Runtimes   map[string]func(...runtime.Option) runtime.Runtime
 
 	// Other options for implementations of the interface
 	// can be stored in a context
@@ -135,3 +138,10 @@ func NewTransport(name string, t func(...transport.Option) transport.Transport)
 		o.Transports[name] = t
 	}
 }
+
+// New runtime func
+func NewRuntime(name string, r func(...runtime.Option) runtime.Runtime) Option {
+	return func(o *Options) {
+		o.Runtimes[name] = r
+	}
+}

config/reader/json/values_test.go

@@ -62,7 +62,7 @@ func TestStructArray(t *testing.T) {
 		{
 			[]byte(`[{"foo": "bar"}]`),
 			emptyTSlice,
-			[]T{T{Foo: "bar"}},
+			[]T{{Foo: "bar"}},
 		},
 	}
 

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 consul 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

@@ -1,95 +0,0 @@
-package consul
-
-import (
-	"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, source.ErrWatcherStopped
-	}
-}
-
-func (w *watcher) Stop() error {
-	select {
-	case <-w.exit:
-		return nil
-	default:
-		w.wp.Stop()
-		close(w.exit)
-	}
-	return nil
-}

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)
+	}
+
+	kvs := make([]*mvccpb.KeyValue, 0, len(rsp.Kvs))
+	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/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 {

data/data.go

@@ -1,2 +0,0 @@
-// Package data is an interface for data access
-package data

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/profile/pprof/pprof.go

@@ -0,0 +1,118 @@
+// Package pprof provides a pprof profiler
+package pprof
+
+import (
+	"os"
+	"path/filepath"
+	"runtime"
+	"runtime/pprof"
+	"sync"
+	"time"
+
+	"github.com/micro/go-micro/debug/profile"
+)
+
+type profiler struct {
+	opts profile.Options
+
+	sync.Mutex
+	running bool
+	exit    chan bool
+
+	// where the cpu profile is written
+	cpuFile *os.File
+	// where the mem profile is written
+	memFile *os.File
+}
+
+func (p *profiler) writeHeap(f *os.File) {
+	defer f.Close()
+
+	t := time.NewTicker(time.Second * 30)
+	defer t.Stop()
+
+	for {
+		select {
+		case <-t.C:
+			runtime.GC()
+			pprof.WriteHeapProfile(f)
+		case <-p.exit:
+			return
+		}
+	}
+}
+
+func (p *profiler) Start() error {
+	p.Lock()
+	defer p.Unlock()
+
+	if p.running {
+		return nil
+	}
+
+	// create exit channel
+	p.exit = make(chan bool)
+
+	cpuFile := filepath.Join("/tmp", "cpu.pprof")
+	memFile := filepath.Join("/tmp", "mem.pprof")
+
+	if len(p.opts.Name) > 0 {
+		cpuFile = filepath.Join("/tmp", p.opts.Name+".cpu.pprof")
+		memFile = filepath.Join("/tmp", p.opts.Name+".mem.pprof")
+	}
+
+	f1, err := os.Create(cpuFile)
+	if err != nil {
+		return err
+	}
+
+	f2, err := os.Create(memFile)
+	if err != nil {
+		return err
+	}
+
+	// start cpu profiling
+	if err := pprof.StartCPUProfile(f1); err != nil {
+		return err
+	}
+
+	// write the heap periodically
+	go p.writeHeap(f2)
+
+	// set cpu file
+	p.cpuFile = f1
+	// set mem file
+	p.memFile = f2
+
+	p.running = true
+
+	return nil
+}
+
+func (p *profiler) Stop() error {
+	p.Lock()
+	defer p.Unlock()
+
+	select {
+	case <-p.exit:
+		return nil
+	default:
+		close(p.exit)
+		pprof.StopCPUProfile()
+		p.cpuFile.Close()
+		p.running = false
+		p.cpuFile = nil
+		p.memFile = nil
+		return nil
+	}
+}
+
+func NewProfile(opts ...profile.Option) profile.Profile {
+	var options profile.Options
+	for _, o := range opts {
+		o(&options)
+	}
+	p := new(profiler)
+	p.opts = options
+	return p
+}

debug/profile/profile.go

@@ -0,0 +1,23 @@
+// Package profile is for profilers
+package profile
+
+type Profile interface {
+	// Start the profiler
+	Start() error
+	// Stop the profiler
+	Stop() error
+}
+
+type Options struct {
+	// Name to use for the profile
+	Name string
+}
+
+type Option func(o *Options)
+
+// Name of the profile
+func Name(n string) Option {
+	return func(o *Options) {
+		o.Name = n
+	}
+}

errors/errors_test.go

@@ -7,7 +7,7 @@ import (
 
 func TestErrors(t *testing.T) {
 	testData := []*Error{
-		&Error{
+		{
 			Id:     "test",
 			Code:   500,
 			Detail: "Internal server error",

go.mod

@@ -1,80 +1,63 @@
 module github.com/micro/go-micro
 
-go 1.12
+go 1.13
 
 require (
-	cloud.google.com/go v0.44.0 // indirect
 	github.com/BurntSushi/toml v0.3.1
-	github.com/Microsoft/go-winio v0.4.14 // indirect
-	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/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 v1.4.2
+	github.com/fsouza/go-dockerclient v1.4.4
 	github.com/ghodss/yaml v1.0.0
-	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/go-cmp v0.3.1 // indirect
-	github.com/google/pprof v0.0.0-20190723021845-34ac40c74b70 // indirect
 	github.com/google/uuid v1.1.1
 	github.com/gorilla/handlers v1.4.2
-	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/hashicorp/golang-lru v0.5.3 // indirect
+	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/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 v1.1.7
-	github.com/kisielk/errcheck v1.2.0 // indirect
-	github.com/konsorten/go-windows-terminal-sequences v1.0.2 // indirect
+	github.com/kr/pretty v0.1.0
 	github.com/leodido/go-urn v1.1.0 // indirect
-	github.com/lucas-clemente/quic-go v0.12.0
-	github.com/mattn/go-colorable v0.1.2 // indirect
-	github.com/mattn/go-runewidth v0.0.4 // indirect
+	github.com/lib/pq v1.2.0
+	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 v0.3.0
-	github.com/miekg/dns v1.1.15 // indirect
-	github.com/mitchellh/gox v1.0.1 // indirect
 	github.com/mitchellh/hashstructure v1.0.0
-	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
-	github.com/modern-go/reflect2 v1.0.1 // indirect
-	github.com/mwitkow/go-conntrack v0.0.0-20190716064945-2f068394615f // indirect
+	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/client_golang v1.1.0 // indirect
-	github.com/sirupsen/logrus v1.4.2 // 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/mobile v0.0.0-20190806162312-597adff16ade // indirect
-	golang.org/x/net v0.0.0-20190724013045-ca1201d0de80
-	golang.org/x/sys v0.0.0-20190812073006-9eafafc0a87e // indirect
-	golang.org/x/tools v0.0.0-20190809145639-6d4652c779c4 // indirect
-	google.golang.org/grpc v1.22.1
-	gopkg.in/go-playground/validator.v9 v9.29.1
+	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 v0.0.1-2019.2.2 // indirect
+	sigs.k8s.io/yaml v1.1.0 // indirect
 )

go.sum

@@ -1,87 +1,122 @@
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+gotest.tools v2.2.0+incompatible h1:VsBPFP1AI068pPrMxtb/S8Zkgf9xEmTLJjfM+P5UIEo=
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-rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
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metadata/metadata.go

@@ -12,6 +12,7 @@ type metaKey struct{}
 // from Transport headers.
 type Metadata map[string]string
 
+// Copy makes a copy of the metadata
 func Copy(md Metadata) Metadata {
 	cmd := make(Metadata)
 	for k, v := range md {
@@ -20,11 +21,31 @@ func Copy(md Metadata) Metadata {
 	return cmd
 }
 
+// FromContext returns metadata from the given context
 func FromContext(ctx context.Context) (Metadata, bool) {
 	md, ok := ctx.Value(metaKey{}).(Metadata)
 	return md, ok
 }
 
+// NewContext creates a new context with the given metadata
 func NewContext(ctx context.Context, md Metadata) context.Context {
 	return context.WithValue(ctx, metaKey{}, md)
 }
+
+// MergeContext merges metadata to existing metadata, overwriting if specified
+func MergeContext(ctx context.Context, patchMd Metadata, overwrite bool) context.Context {
+	md, _ := ctx.Value(metaKey{}).(Metadata)
+	cmd := make(Metadata)
+	for k, v := range md {
+		cmd[k] = v
+	}
+	for k, v := range patchMd {
+		if _, ok := cmd[k]; ok && !overwrite {
+			// skip
+		} else {
+			cmd[k] = v
+		}
+	}
+	return context.WithValue(ctx, metaKey{}, cmd)
+
+}

metadata/metadata_test.go

@@ -2,6 +2,7 @@ package metadata
 
 import (
 	"context"
+	"reflect"
 	"testing"
 )
 
@@ -40,3 +41,42 @@ func TestMetadataContext(t *testing.T) {
 		t.Errorf("Expected metadata length 1 got %d", i)
 	}
 }
+
+func TestMergeContext(t *testing.T) {
+	type args struct {
+		existing  Metadata
+		append    Metadata
+		overwrite bool
+	}
+	tests := []struct {
+		name string
+		args args
+		want Metadata
+	}{
+		{
+			name: "matching key, overwrite false",
+			args: args{
+				existing:  Metadata{"foo": "bar", "sumo": "demo"},
+				append:    Metadata{"sumo": "demo2"},
+				overwrite: false,
+			},
+			want: Metadata{"foo": "bar", "sumo": "demo"},
+		},
+		{
+			name: "matching key, overwrite true",
+			args: args{
+				existing:  Metadata{"foo": "bar", "sumo": "demo"},
+				append:    Metadata{"sumo": "demo2"},
+				overwrite: true,
+			},
+			want: Metadata{"foo": "bar", "sumo": "demo2"},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got, _ := FromContext(MergeContext(NewContext(context.TODO(), tt.args.existing), tt.args.append, tt.args.overwrite)); !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("MergeContext() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}

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

@@ -24,6 +24,22 @@ type monitor struct {
 	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) {
@@ -47,6 +63,10 @@ func (m *monitor) check(service string) (*Status, error) {
 			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(),
@@ -58,13 +78,6 @@ func (m *monitor) check(service string) (*Status, error) {
 				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
@@ -120,7 +133,7 @@ func (m *monitor) reap() {
 	defer m.Unlock()
 
 	// range over our watched services
-	for service, _ := range m.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
@@ -175,14 +188,14 @@ func (m *monitor) run() {
 			serviceMap := make(map[string]bool)
 
 			m.RLock()
-			for service, _ := range m.services {
+			for service := range m.services {
 				serviceMap[service] = true
 			}
 			m.RUnlock()
 
 			go func() {
 				// check the status of all watched services
-				for service, _ := range serviceMap {
+				for service := range serviceMap {
 					select {
 					case <-m.exit:
 						return
@@ -287,7 +300,7 @@ func (m *monitor) Stop() error {
 		return nil
 	default:
 		close(m.exit)
-		for s, _ := range m.services {
+		for s := range m.services {
 			delete(m.services, s)
 		}
 		m.registry.Stop()

monitor/monitor.go

@@ -17,6 +17,8 @@ type StatusCode int
 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

network/handler/handler.go

@@ -1,111 +0,0 @@
-// Package handler implements network RPC handler
-package handler
-
-import (
-	"context"
-	"sort"
-
-	"github.com/micro/go-micro/errors"
-	"github.com/micro/go-micro/network"
-	pbNet "github.com/micro/go-micro/network/proto"
-	pbRtr "github.com/micro/go-micro/router/proto"
-)
-
-// Network implements network handler
-type Network struct {
-	Network network.Network
-}
-
-// ListRoutes returns a list of routing table routes
-func (n *Network) ListRoutes(ctx context.Context, req *pbRtr.Request, resp *pbRtr.ListResponse) error {
-	routes, err := n.Network.Options().Router.Table().List()
-	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
-}
-
-// ListNodes returns a list of all accessible nodes in the network
-func (n *Network) ListNodes(ctx context.Context, req *pbNet.ListRequest, resp *pbNet.ListResponse) error {
-	nodes := n.Network.Nodes()
-
-	var respNodes []*pbNet.Node
-	for _, node := range nodes {
-		respNode := &pbNet.Node{
-			Id:      node.Id(),
-			Address: node.Address(),
-		}
-		respNodes = append(respNodes, respNode)
-	}
-
-	resp.Nodes = respNodes
-
-	return nil
-}
-
-// Neighbourhood returns a list of immediate neighbours
-func (n *Network) Neighbourhood(ctx context.Context, req *pbNet.NeighbourhoodRequest, resp *pbNet.NeighbourhoodResponse) error {
-	// extract the id of the node to query
-	id := req.Id
-	// if no id is passed, we assume local node
-	if id == "" {
-		id = n.Network.Id()
-	}
-
-	// get all the nodes in the network
-	nodes := n.Network.Nodes()
-
-	// sort the slice of nodes
-	sort.Slice(nodes, func(i, j int) bool { return nodes[i].Id() <= nodes[j].Id() })
-	// find a node with a given id
-	i := sort.Search(len(nodes), func(j int) bool { return nodes[j].Id() >= id })
-
-	var neighbours []*pbNet.Node
-	// collect all the nodes in the neighbourhood of the found node
-	if i < len(nodes) && nodes[i].Id() == id {
-		for _, neighbour := range nodes[i].Neighbourhood() {
-			// don't return yourself in response
-			if neighbour.Id() == n.Network.Id() {
-				continue
-			}
-			pbNeighbour := &pbNet.Node{
-				Id:      neighbour.Id(),
-				Address: neighbour.Address(),
-			}
-			neighbours = append(neighbours, pbNeighbour)
-		}
-	}
-
-	// requested neighbourhood node
-	node := &pbNet.Node{
-		Id:      nodes[i].Id(),
-		Address: nodes[i].Address(),
-	}
-
-	// creaate neighbourhood answer
-	neighbourhood := &pbNet.Neighbour{
-		Node:       node,
-		Neighbours: neighbours,
-	}
-
-	resp.Neighbourhood = neighbourhood
-
-	return nil
-}

network/network.go

@@ -6,6 +6,8 @@ import (
 
 	"github.com/micro/go-micro/client"
 	"github.com/micro/go-micro/server"
+	"github.com/micro/go-micro/transport"
+	"github.com/micro/go-micro/tunnel"
 )
 
 var (
@@ -28,8 +30,8 @@ type Node interface {
 	Id() string
 	// Address is node bind address
 	Address() string
-	// Neighbourhood is node neighbourhood
-	Neighbourhood() []Node
+	// Peers returns node peers
+	Peers() []Node
 	// Network is the network node is in
 	Network() Network
 }
@@ -38,14 +40,14 @@ type Node interface {
 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
-	// Nodes returns list of network nodes
-	Nodes() []Node
 	// Close stops the tunnel and resolving
 	Close() error
 	// Client is micro client
@@ -54,6 +56,14 @@ type Network interface {
 	Server() server.Server
 }
 
+// message is network message
+type message struct {
+	// msg is transport message
+	msg *transport.Message
+	// session is tunnel session
+	session tunnel.Session
+}
+
 // 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()
+
+	peers := make([]Node, 0, len(n.peers))
+	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

@@ -20,8 +20,10 @@ type Options struct {
 	Name string
 	// Address to bind to
 	Address string
-	// Nodes is a list of seed nodes
-	Nodes []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
@@ -53,11 +55,17 @@ func Address(a string) Option {
 	}
 }
 
-// Nodes is a list of seed nodes used along
-// with resolved node
-func Nodes(n ...string) Option {
+// Advertise sets the address to advertise
+func Advertise(a string) Option {
 	return func(o *Options) {
-		o.Nodes = n
+		o.Advertise = a
+	}
+}
+
+// Peers is a list of peers to connect to
+func Peers(n ...string) Option {
+	return func(o *Options) {
+		o.Peers = n
 	}
 }
 

network/proto/network.micro.go

@@ -1,12 +1,12 @@
 // Code generated by protoc-gen-micro. DO NOT EDIT.
-// source: network.proto
+// source: github.com/micro/go-micro/network/proto/network.proto
 
 package go_micro_network
 
 import (
 	fmt "fmt"
 	proto "github.com/golang/protobuf/proto"
-	proto1 "github.com/micro/go-micro/router/proto"
+	_ "github.com/micro/go-micro/router/proto"
 	math "math"
 )
 
@@ -35,9 +35,16 @@ var _ server.Option
 // Client API for Network service
 
 type NetworkService interface {
-	ListRoutes(ctx context.Context, in *proto1.Request, opts ...client.CallOption) (*proto1.ListResponse, error)
-	ListNodes(ctx context.Context, in *ListRequest, opts ...client.CallOption) (*ListResponse, error)
-	Neighbourhood(ctx context.Context, in *NeighbourhoodRequest, opts ...client.CallOption) (*NeighbourhoodResponse, error)
+	// 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 {
@@ -58,9 +65,9 @@ func NewNetworkService(name string, c client.Client) NetworkService {
 	}
 }
 
-func (c *networkService) ListRoutes(ctx context.Context, in *proto1.Request, opts ...client.CallOption) (*proto1.ListResponse, error) {
-	req := c.c.NewRequest(c.name, "Network.ListRoutes", in)
-	out := new(proto1.ListResponse)
+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
@@ -68,9 +75,9 @@ func (c *networkService) ListRoutes(ctx context.Context, in *proto1.Request, opt
 	return out, nil
 }
 
-func (c *networkService) ListNodes(ctx context.Context, in *ListRequest, opts ...client.CallOption) (*ListResponse, error) {
-	req := c.c.NewRequest(c.name, "Network.ListNodes", in)
-	out := new(ListResponse)
+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
@@ -78,9 +85,29 @@ func (c *networkService) ListNodes(ctx context.Context, in *ListRequest, opts ..
 	return out, nil
 }
 
-func (c *networkService) Neighbourhood(ctx context.Context, in *NeighbourhoodRequest, opts ...client.CallOption) (*NeighbourhoodResponse, error) {
-	req := c.c.NewRequest(c.name, "Network.Neighbourhood", in)
-	out := new(NeighbourhoodResponse)
+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
@@ -91,16 +118,25 @@ func (c *networkService) Neighbourhood(ctx context.Context, in *NeighbourhoodReq
 // Server API for Network service
 
 type NetworkHandler interface {
-	ListRoutes(context.Context, *proto1.Request, *proto1.ListResponse) error
-	ListNodes(context.Context, *ListRequest, *ListResponse) error
-	Neighbourhood(context.Context, *NeighbourhoodRequest, *NeighbourhoodResponse) error
+	// 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 {
-		ListRoutes(ctx context.Context, in *proto1.Request, out *proto1.ListResponse) error
-		ListNodes(ctx context.Context, in *ListRequest, out *ListResponse) error
-		Neighbourhood(ctx context.Context, in *NeighbourhoodRequest, out *NeighbourhoodResponse) error
+		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
@@ -113,14 +149,22 @@ type networkHandler struct {
 	NetworkHandler
 }
 
-func (h *networkHandler) ListRoutes(ctx context.Context, in *proto1.Request, out *proto1.ListResponse) error {
-	return h.NetworkHandler.ListRoutes(ctx, in, out)
+func (h *networkHandler) Connect(ctx context.Context, in *ConnectRequest, out *ConnectResponse) error {
+	return h.NetworkHandler.Connect(ctx, in, out)
 }
 
-func (h *networkHandler) ListNodes(ctx context.Context, in *ListRequest, out *ListResponse) error {
-	return h.NetworkHandler.ListNodes(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) Neighbourhood(ctx context.Context, in *NeighbourhoodRequest, out *NeighbourhoodResponse) error {
-	return h.NetworkHandler.Neighbourhood(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.proto

@@ -6,35 +6,79 @@ import "github.com/micro/go-micro/router/proto/router.proto";
 
 // Network service is usesd to gain visibility into networks
 service Network {
-        rpc ListRoutes(go.micro.router.Request) returns (go.micro.router.ListResponse) {};
-        rpc ListNodes(ListRequest) returns (ListResponse) {};
-        rpc Neighbourhood(NeighbourhoodRequest) returns (NeighbourhoodResponse) {};
+	// 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) {};
 }
 
-// Empty request
-message ListRequest {}
+// Query is passed in a LookupRequest
+message Query {
+	string service = 1;
+	string address = 2;
+	string gateway = 3;
+	string router = 4;
+	string network = 5;
+}
 
-// ListResponse is returned by ListNodes and ListNeighbours
-message ListResponse {
+message ConnectRequest {
 	repeated Node nodes = 1;
 }
 
-// NeighbourhoodRequest is sent to query node neighbourhood
-message NeighbourhoodRequest {
-        string id = 1;
+message ConnectResponse {}
+
+// PeerRequest requests list of peers
+message NodesRequest {
+        // node topology depth
+        uint32 depth = 1;
 }
 
-// NeighbourhoodResponse contains node neighbourhood hierarchy
-message NeighbourhoodResponse {
-        Neighbour neighbourhood = 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 ide
+        // 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
@@ -49,16 +93,10 @@ message Close {
         Node node = 1;
 }
 
-// Solicit is sent when requesting route advertisement from the network nodes
-message Solicit {
+// Peer is used to advertise node peers
+message Peer {
         // network node
         Node node = 1;
-}
-
-// Neighbour is used to nnounce node neighbourhood
-message Neighbour {
-        // network node
-        Node node = 1;
-        // neighbours
-        repeated Node neighbours = 3;
+        // node peers
+        repeated Peer peers = 2;
 }

network/resolver/dns/dns.go

@@ -1,8 +1,7 @@
-// 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"
@@ -13,19 +12,31 @@ 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"
@@ -17,11 +18,19 @@ type Resolver struct {
 
 	// 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 {
@@ -32,29 +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/resolver.go

@@ -11,5 +11,6 @@ type Resolver interface {
 
 // A resolved record
 type Record struct {
-	Address string `json:"address"`
+	Address  string `json:"address"`
+	Priority int64  `json:"priority"`
 }

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)
+	}
+
+	respRoutes := make([]*pbRtr.Route, 0, len(routes))
+	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
+}

plugin/default.go

@@ -121,5 +121,7 @@ func (p *plugin) Build(path string, c *Config) error {
 		return fmt.Errorf("Failed to create dir %s: %v", filepath.Dir(path), err)
 	}
 	cmd := exec.Command("go", "build", "-buildmode=plugin", "-o", path+".so", goFile)
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
 	return cmd.Run()
 }

proxy/http/http.go

@@ -113,7 +113,7 @@ func (p *Proxy) ServeRequest(ctx context.Context, req server.Request, rsp server
 
 		// set response headers
 		hdr = map[string]string{}
-		for k, _ := range hrsp.Header {
+		for k := range hrsp.Header {
 			hdr[k] = hrsp.Header.Get(k)
 		}
 		// write the header

proxy/mucp/mucp.go

@@ -8,15 +8,19 @@ import (
 	"sort"
 	"strings"
 	"sync"
+	"time"
 
 	"github.com/micro/go-micro/client"
+	"github.com/micro/go-micro/client/selector"
 	"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/errors"
+	"github.com/micro/go-micro/metadata"
 	"github.com/micro/go-micro/proxy"
 	"github.com/micro/go-micro/router"
 	"github.com/micro/go-micro/server"
+	"github.com/micro/go-micro/util/log"
 )
 
 // Proxy will transparently proxy requests to an endpoint.
@@ -40,9 +44,6 @@ type Proxy struct {
 	// A fib of routes service:address
 	sync.RWMutex
 	Routes map[string]map[uint64]router.Route
-
-	// The channel to monitor watcher errors
-	errChan chan error
 }
 
 // read client request and write to server
@@ -93,6 +94,75 @@ func toNodes(routes []router.Route) []string {
 	return nodes
 }
 
+func toSlice(r map[uint64]router.Route) []router.Route {
+	routes := make([]router.Route, 0, len(r))
+	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
+}
+
+func (p *Proxy) filterRoutes(ctx context.Context, routes []router.Route) []router.Route {
+	md, ok := metadata.FromContext(ctx)
+	if !ok {
+		return routes
+	}
+
+	var filteredRoutes []router.Route
+
+	// filter the routes based on our headers
+	for _, route := range routes {
+		// process only routes for this id
+		if id := md["Micro-Router"]; len(id) > 0 {
+			if route.Router != id {
+				// skip routes that don't mwatch
+				continue
+			}
+		}
+
+		// only process routes with this network
+		if net := md["Micro-Network"]; len(net) > 0 {
+			if route.Network != net {
+				// skip routes that don't mwatch
+				continue
+			}
+		}
+
+		// process only this gateway
+		if gw := md["Micro-Gateway"]; len(gw) > 0 {
+			// if the gateway matches our address
+			// special case, take the routes with no gateway
+			// TODO: should we strip the gateway from the context?
+			if gw == p.Router.Options().Address {
+				if len(route.Gateway) > 0 && route.Gateway != gw {
+					continue
+				}
+				// otherwise its a local route and we're keeping it
+			} else {
+				// gateway does not match our own
+				if route.Gateway != gw {
+					continue
+				}
+			}
+		}
+
+		// TODO: address based filtering
+		// address := md["Micro-Address"]
+
+		// TODO: label based filtering
+		// requires new field in routing table : route.Labels
+
+		// passed the filter checks
+		filteredRoutes = append(filteredRoutes, route)
+	}
+
+	return filteredRoutes
+}
+
 func (p *Proxy) getLink(r router.Route) (client.Client, error) {
 	if r.Link == "local" || len(p.Links) == 0 {
 		return p.Client, nil
@@ -104,30 +174,29 @@ func (p *Proxy) getLink(r router.Route) (client.Client, error) {
 	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
-	}
-
+func (p *Proxy) getRoute(ctx context.Context, service string) ([]router.Route, error) {
 	// lookup the route cache first
 	p.Lock()
-	routes, ok := p.Routes[service]
+	cached, ok := p.Routes[service]
 	if ok {
 		p.Unlock()
-		return toSlice(routes), nil
+		routes := toSlice(cached)
+		return p.filterRoutes(ctx, routes), nil
 	}
 	p.Unlock()
 
+	// cache routes for the service
+	routes, err := p.cacheRoutes(service)
+	if err != nil {
+		return nil, err
+	}
+
+	return p.filterRoutes(ctx, routes), nil
+}
+
+func (p *Proxy) cacheRoutes(service string) ([]router.Route, 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 {
@@ -146,18 +215,40 @@ func (p *Proxy) getRoute(service string) ([]router.Route, error) {
 		}
 		p.Routes[service][route.Hash()] = route
 	}
-	routes = p.Routes[service]
+	routes := p.Routes[service]
 	p.Unlock()
 
 	return toSlice(routes), nil
 }
 
-// manageRouteCache applies action on a given route to Proxy route cache
-func (p *Proxy) manageRouteCache(route router.Route, action string) error {
+// refreshMetrics will refresh any metrics for our local cached routes.
+// we may not receive new watch events for these as they change.
+func (p *Proxy) refreshMetrics() {
+	services := make([]string, 0, len(p.Routes))
+
+	// get a list of services to update
+	p.RLock()
+	for service := range p.Routes {
+		services = append(services, service)
+	}
+	p.RUnlock()
+
+	// get and cache the routes for the service
+	for _, service := range services {
+		p.cacheRoutes(service)
+	}
+}
+
+// manageRoutes applies action on a given route to Proxy route cache
+func (p *Proxy) manageRoutes(route router.Route, action string) error {
+	// we only cache what we are actually concerned with
+	p.Lock()
+	defer p.Unlock()
+
 	switch action {
 	case "create", "update":
 		if _, ok := p.Routes[route.Service]; !ok {
-			p.Routes[route.Service] = make(map[uint64]router.Route)
+			return fmt.Errorf("not called %s", route.Service)
 		}
 		p.Routes[route.Service][route.Hash()] = route
 	case "delete":
@@ -171,31 +262,22 @@ func (p *Proxy) manageRouteCache(route router.Route, action string) error {
 
 // watchRoutes watches service routes and updates proxy cache
 func (p *Proxy) watchRoutes() {
-	// this is safe to do as the only way watchRoutes returns is
-	// when some error is written into error channel - we want to bail then
-	defer close(p.errChan)
-
 	// route watcher
 	w, err := p.Router.Watch()
 	if err != nil {
-		p.errChan <- err
 		return
 	}
 
 	for {
 		event, err := w.Next()
 		if err != nil {
-			p.errChan <- err
 			return
 		}
 
-		p.Lock()
-		if err := p.manageRouteCache(event.Route, fmt.Sprintf("%s", event.Type)); err != nil {
+		if err := p.manageRoutes(event.Route, fmt.Sprintf("%s", event.Type)); err != nil {
 			// TODO: should we bail here?
-			p.Unlock()
 			continue
 		}
-		p.Unlock()
 	}
 }
 
@@ -232,7 +314,7 @@ func (p *Proxy) ServeRequest(ctx context.Context, req server.Request, rsp server
 			addresses = []string{p.Endpoint}
 		} else {
 			// get route for endpoint from router
-			addr, err := p.getRoute(p.Endpoint)
+			addr, err := p.getRoute(ctx, p.Endpoint)
 			if err != nil {
 				return err
 			}
@@ -244,18 +326,25 @@ func (p *Proxy) ServeRequest(ctx context.Context, req server.Request, rsp server
 	} else {
 		// no endpoint was specified just lookup the route
 		// get route for endpoint from router
-		addr, err := p.getRoute(service)
+		addr, err := p.getRoute(ctx, service)
 		if err != nil {
 			return err
 		}
 		routes = addr
 	}
 
+	var opts []client.CallOption
+
+	// set strategy to round robin
+	opts = append(opts, client.WithSelectOption(selector.WithStrategy(selector.RoundRobin)))
+
 	// 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...))
+		return p.serveRequest(ctx, p.Client, service, endpoint, req, rsp, opts...)
 	}
 
 	// there's no links e.g we're local routing then just serve it with addresses
@@ -285,11 +374,14 @@ func (p *Proxy) ServeRequest(ctx context.Context, req server.Request, rsp server
 			continue
 		}
 
+		log.Debugf("Proxy using route %+v\n", route)
+
 		// set the address to call
 		addresses := toNodes([]router.Route{route})
+		opts = append(opts, client.WithAddress(addresses...))
 
 		// do the request with the link
-		gerr = p.serveRequest(ctx, link, service, endpoint, req, rsp, client.WithAddress(addresses...))
+		gerr = p.serveRequest(ctx, link, service, endpoint, req, rsp, opts...)
 		// return on no error since we succeeded
 		if gerr == nil {
 			return nil
@@ -347,39 +439,28 @@ func (p *Proxy) serveRequest(ctx context.Context, link client.Client, service, e
 	// get raw response
 	resp := stream.Response()
 
-	// route watcher error
-	var watchErr error
-
 	// create server response write loop
 	for {
-		select {
-		case err := <-p.errChan:
-			if err != nil {
-				watchErr = err
-			}
-			return watchErr
-		default:
-			// read backend response body
-			body, err := resp.Read()
-			if err == io.EOF {
-				return nil
-			} else if err != nil {
-				return err
-			}
+		// read backend response body
+		body, err := resp.Read()
+		if err == io.EOF {
+			return nil
+		} else if err != nil {
+			return err
+		}
 
-			// read backend response header
-			hdr := resp.Header()
+		// read backend response header
+		hdr := resp.Header()
 
-			// write raw response header to client
-			rsp.WriteHeader(hdr)
+		// write raw response header to client
+		rsp.WriteHeader(hdr)
 
-			// write raw response body to client
-			err = rsp.Write(body)
-			if err == io.EOF {
-				return nil
-			} else if err != nil {
-				return err
-			}
+		// write raw response body to client
+		err = rsp.Write(body)
+		if err == io.EOF {
+			return nil
+		} else if err != nil {
+			return err
 		}
 	}
 
@@ -438,9 +519,29 @@ func NewProxy(opts ...options.Option) proxy.Proxy {
 	// routes cache
 	p.Routes = make(map[string]map[uint64]router.Route)
 
-	// 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)
+		}
+	}()
+
+	go func() {
+		t := time.NewTicker(time.Minute)
+		defer t.Stop()
+
+		// we must refresh route metrics since they do not trigger new events
+		for {
+			select {
+			case <-t.C:
+				// refresh route metrics
+				p.refreshMetrics()
+			}
+		}
+	}()
 
 	return p
 }

registry/cache/cache.go

@@ -36,7 +36,15 @@ type cache struct {
 	ttls    map[string]time.Time
 	watched map[string]bool
 
+	// used to stop the cache
 	exit chan bool
+
+	// indicate whether its running
+	running bool
+	// status of the registry
+	// used to hold onto the cache
+	// in failure state
+	status error
 }
 
 var (
@@ -50,6 +58,18 @@ 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
@@ -63,7 +83,7 @@ func (c *cache) isValid(services []*registry.Service, ttl time.Time) bool {
 	}
 
 	// time since ttl is longer than timeout
-	if time.Since(ttl) > c.opts.TTL {
+	if time.Since(ttl) > 0 {
 		return false
 	}
 
@@ -81,6 +101,11 @@ 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 +118,38 @@ 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))
@@ -121,15 +159,28 @@ func (c *cache) get(service string) ([]*registry.Service, error) {
 	}
 
 	// watch service if not watched
-	if _, ok := c.watched[service]; !ok {
-		go c.run(service)
-	}
+	_, ok := c.watched[service]
 
 	// unlock the read lock
 	c.RUnlock()
 
+	// check if its being watched
+	if !ok {
+		c.Lock()
+
+		// set to watched
+		c.watched[service] = true
+
+		// only kick it off if not running
+		if !c.running {
+			go c.run()
+		}
+
+		c.Unlock()
+	}
+
 	// get and return services
-	return get(service)
+	return get(service, cp)
 }
 
 func (c *cache) set(service string, services []*registry.Service) {
@@ -145,6 +196,11 @@ func (c *cache) update(res *registry.Result) {
 	c.Lock()
 	defer c.Unlock()
 
+	// only save watched services
+	if _, ok := c.watched[res.Service.Name]; !ok {
+		return
+	}
+
 	services, ok := c.cache[res.Service.Name]
 	if !ok {
 		// we're not going to cache anything
@@ -247,16 +303,16 @@ func (c *cache) update(res *registry.Result) {
 
 // run starts the cache watcher loop
 // it creates a new watcher if there's a problem
-func (c *cache) run(service string) {
-	// set watcher
+func (c *cache) run() {
 	c.Lock()
-	c.watched[service] = true
+	c.running = true
 	c.Unlock()
 
-	// delete watcher on exit
+	// reset watcher on exit
 	defer func() {
 		c.Lock()
-		delete(c.watched, service)
+		c.watched = make(map[string]bool)
+		c.running = false
 		c.Unlock()
 	}()
 
@@ -273,16 +329,14 @@ func (c *cache) run(service string) {
 		time.Sleep(time.Duration(j) * time.Millisecond)
 
 		// create new watcher
-		w, err := c.Registry.Watch(
-			registry.WatchService(service),
-		)
-
+		w, err := c.Registry.Watch()
 		if err != nil {
 			if c.quit() {
 				return
 			}
 
 			d := backoff(a)
+			c.setStatus(err)
 
 			if a > 3 {
 				log.Log("rcache: ", err, " backing off ", d)
@@ -305,6 +359,7 @@ func (c *cache) run(service string) {
 			}
 
 			d := backoff(b)
+			c.setStatus(err)
 
 			if b > 3 {
 				log.Log("rcache: ", err, " backing off ", d)
@@ -348,6 +403,13 @@ func (c *cache) watch(w registry.Watcher) error {
 			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)
 	}
 }
@@ -369,6 +431,9 @@ func (c *cache) GetService(service string) ([]*registry.Service, error) {
 }
 
 func (c *cache) Stop() {
+	c.Lock()
+	defer c.Unlock()
+
 	select {
 	case <-c.exit:
 		return
@@ -378,7 +443,7 @@ func (c *cache) Stop() {
 }
 
 func (c *cache) String() string {
-	return "rcache"
+	return "cache"
 }
 
 // New returns a new cache

registry/consul/consul.go

@@ -1,438 +0,0 @@
-package consul
-
-import (
-	"crypto/tls"
-	"errors"
-	"fmt"
-	"net"
-	"net/http"
-	"runtime"
-	"strconv"
-	"sync"
-	"time"
-
-	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
-	opts    registry.Options
-
-	client *consul.Client
-	config *consul.Config
-
-	// connect enabled
-	connect bool
-
-	queryOptions *consul.QueryOptions
-
-	sync.Mutex
-	register map[string]uint64
-	// lastChecked tracks when a node was last checked as existing in Consul
-	lastChecked map[string]time.Time
-}
-
-func getDeregisterTTL(t time.Duration) time.Duration {
-	// splay slightly for the watcher?
-	splay := time.Second * 5
-	deregTTL := t + splay
-
-	// consul has a minimum timeout on deregistration of 1 minute.
-	if t < time.Minute {
-		deregTTL = time.Minute + splay
-	}
-
-	return deregTTL
-}
-
-func newTransport(config *tls.Config) *http.Transport {
-	if config == nil {
-		config = &tls.Config{
-			InsecureSkipVerify: true,
-		}
-	}
-
-	t := &http.Transport{
-		Proxy: http.ProxyFromEnvironment,
-		Dial: (&net.Dialer{
-			Timeout:   30 * time.Second,
-			KeepAlive: 30 * time.Second,
-		}).Dial,
-		TLSHandshakeTimeout: 10 * time.Second,
-		TLSClientConfig:     config,
-	}
-	runtime.SetFinalizer(&t, func(tr **http.Transport) {
-		(*tr).CloseIdleConnections()
-	})
-	return t
-}
-
-func configure(c *consulRegistry, opts ...registry.Option) {
-	// set opts
-	for _, o := range opts {
-		o(&c.opts)
-	}
-
-	// use default config
-	config := consul.DefaultConfig()
-
-	if c.opts.Context != nil {
-		// Use the consul config passed in the options, if available
-		if co, ok := c.opts.Context.Value("consul_config").(*consul.Config); ok {
-			config = co
-		}
-		if cn, ok := c.opts.Context.Value("consul_connect").(bool); ok {
-			c.connect = cn
-		}
-
-		// Use the consul query options passed in the options, if available
-		if qo, ok := c.opts.Context.Value("consul_query_options").(*consul.QueryOptions); ok && qo != nil {
-			c.queryOptions = qo
-		}
-		if as, ok := c.opts.Context.Value("consul_allow_stale").(bool); ok {
-			c.queryOptions.AllowStale = as
-		}
-	}
-
-	// check if there are any addrs
-	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 = address
-			addrs = append(addrs, fmt.Sprintf("%s:%s", addr, port))
-		} else if err == nil {
-			addrs = append(addrs, fmt.Sprintf("%s:%s", 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)
-	}
-
-	// set timeout
-	if c.opts.Timeout > 0 {
-		config.HttpClient.Timeout = c.opts.Timeout
-	}
-
-	// set the config
-	c.config = config
-
-	// remove client
-	c.client = nil
-
-	// setup the client
-	c.Client()
-}
-
-func (c *consulRegistry) Init(opts ...registry.Option) error {
-	configure(c, opts...)
-	return nil
-}
-
-func (c *consulRegistry) Deregister(s *registry.Service) error {
-	if len(s.Nodes) == 0 {
-		return errors.New("Require at least one node")
-	}
-
-	// delete our hash and time check of the service
-	c.Lock()
-	delete(c.register, s.Name)
-	delete(c.lastChecked, s.Name)
-	c.Unlock()
-
-	node := s.Nodes[0]
-	return c.Client().Agent().ServiceDeregister(node.Id)
-}
-
-func (c *consulRegistry) Register(s *registry.Service, opts ...registry.RegisterOption) error {
-	if len(s.Nodes) == 0 {
-		return errors.New("Require at least one node")
-	}
-
-	var regTCPCheck bool
-	var regInterval time.Duration
-
-	var options registry.RegisterOptions
-	for _, o := range opts {
-		o(&options)
-	}
-
-	if c.opts.Context != nil {
-		if tcpCheckInterval, ok := c.opts.Context.Value("consul_tcp_check").(time.Duration); ok {
-			regTCPCheck = true
-			regInterval = tcpCheckInterval
-		}
-	}
-
-	// create hash of service; uint64
-	h, err := hash.Hash(s, nil)
-	if err != nil {
-		return err
-	}
-
-	// use first node
-	node := s.Nodes[0]
-
-	// get existing hash and last checked time
-	c.Lock()
-	v, ok := c.register[s.Name]
-	lastChecked := c.lastChecked[s.Name]
-	c.Unlock()
-
-	// if it's already registered and matches then just pass the check
-	if ok && v == h {
-		if options.TTL == time.Duration(0) {
-			// ensure that our service hasn't been deregistered by Consul
-			if time.Since(lastChecked) <= getDeregisterTTL(regInterval) {
-				return nil
-			}
-			services, _, err := c.Client().Health().Checks(s.Name, c.queryOptions)
-			if err == nil {
-				for _, v := range services {
-					if v.ServiceID == node.Id {
-						return nil
-					}
-				}
-			}
-		} 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 {
-				return nil
-			}
-		}
-	}
-
-	// encode the tags
-	tags := encodeMetadata(node.Metadata)
-	tags = append(tags, encodeEndpoints(s.Endpoints)...)
-	tags = append(tags, encodeVersion(s.Version)...)
-
-	var check *consul.AgentServiceCheck
-
-	if regTCPCheck {
-		deregTTL := getDeregisterTTL(regInterval)
-
-		check = &consul.AgentServiceCheck{
-			TCP:                            node.Address,
-			Interval:                       fmt.Sprintf("%v", regInterval),
-			DeregisterCriticalServiceAfter: fmt.Sprintf("%v", deregTTL),
-		}
-
-		// if the TTL is greater than 0 create an associated check
-	} else if options.TTL > time.Duration(0) {
-		deregTTL := getDeregisterTTL(options.TTL)
-
-		check = &consul.AgentServiceCheck{
-			TTL:                            fmt.Sprintf("%v", options.TTL),
-			DeregisterCriticalServiceAfter: fmt.Sprintf("%v", deregTTL),
-		}
-	}
-
-	host, pt, _ := net.SplitHostPort(node.Address)
-	if host == "" {
-		host = node.Address
-	}
-	port, _ := strconv.Atoi(pt)
-
-	// register the service
-	asr := &consul.AgentServiceRegistration{
-		ID:      node.Id,
-		Name:    s.Name,
-		Tags:    tags,
-		Port:    port,
-		Address: host,
-		Check:   check,
-	}
-
-	// Specify consul connect
-	if c.connect {
-		asr.Connect = &consul.AgentServiceConnect{
-			Native: true,
-		}
-	}
-
-	if err := c.Client().Agent().ServiceRegister(asr); err != nil {
-		return err
-	}
-
-	// save our hash and time check of the service
-	c.Lock()
-	c.register[s.Name] = h
-	c.lastChecked[s.Name] = time.Now()
-	c.Unlock()
-
-	// if the TTL is 0 we don't mess with the checks
-	if options.TTL == time.Duration(0) {
-		return nil
-	}
-
-	// pass the healthcheck
-	return c.Client().Agent().PassTTL("service:"+node.Id, "")
-}
-
-func (c *consulRegistry) GetService(name string) ([]*registry.Service, error) {
-	var rsp []*consul.ServiceEntry
-	var err error
-
-	// if we're connect enabled only get connect services
-	if c.connect {
-		rsp, _, err = c.Client().Health().Connect(name, "", false, c.queryOptions)
-	} else {
-		rsp, _, err = c.Client().Health().Service(name, "", false, c.queryOptions)
-	}
-	if err != nil {
-		return nil, err
-	}
-
-	serviceMap := map[string]*registry.Service{}
-
-	for _, s := range rsp {
-		if s.Service.Service != name {
-			continue
-		}
-
-		// version is now a tag
-		version, _ := decodeVersion(s.Service.Tags)
-		// service ID is now the node id
-		id := s.Service.ID
-		// key is always the version
-		key := version
-
-		// address is service address
-		address := s.Service.Address
-
-		// use node address
-		if len(address) == 0 {
-			address = s.Node.Address
-		}
-
-		svc, ok := serviceMap[key]
-		if !ok {
-			svc = &registry.Service{
-				Endpoints: decodeEndpoints(s.Service.Tags),
-				Name:      s.Service.Service,
-				Version:   version,
-			}
-			serviceMap[key] = svc
-		}
-
-		var del bool
-
-		for _, check := range s.Checks {
-			// delete the node if the status is critical
-			if check.Status == "critical" {
-				del = true
-				break
-			}
-		}
-
-		// if delete then skip the node
-		if del {
-			continue
-		}
-
-		svc.Nodes = append(svc.Nodes, &registry.Node{
-			Id:       id,
-			Address:  mnet.HostPort(address, s.Service.Port),
-			Metadata: decodeMetadata(s.Service.Tags),
-		})
-	}
-
-	var services []*registry.Service
-	for _, service := range serviceMap {
-		services = append(services, service)
-	}
-	return services, nil
-}
-
-func (c *consulRegistry) ListServices() ([]*registry.Service, error) {
-	rsp, _, err := c.Client().Catalog().Services(c.queryOptions)
-	if err != nil {
-		return nil, err
-	}
-
-	var services []*registry.Service
-
-	for service := range rsp {
-		services = append(services, &registry.Service{Name: service})
-	}
-
-	return services, nil
-}
-
-func (c *consulRegistry) Watch(opts ...registry.WatchOption) (registry.Watcher, error) {
-	return newConsulWatcher(c, opts...)
-}
-
-func (c *consulRegistry) String() string {
-	return "consul"
-}
-
-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{},
-		register:    make(map[string]uint64),
-		lastChecked: make(map[string]time.Time),
-		queryOptions: &consul.QueryOptions{
-			AllowStale: true,
-		},
-	}
-	configure(cr, opts...)
-	return cr
-}

registry/consul/encoding.go

@@ -1,170 +0,0 @@
-package consul
-
-import (
-	"bytes"
-	"compress/zlib"
-	"encoding/hex"
-	"encoding/json"
-	"io/ioutil"
-
-	"github.com/micro/go-micro/registry"
-)
-
-func encode(buf []byte) string {
-	var b bytes.Buffer
-	defer b.Reset()
-
-	w := zlib.NewWriter(&b)
-	if _, err := w.Write(buf); err != nil {
-		return ""
-	}
-	w.Close()
-
-	return hex.EncodeToString(b.Bytes())
-}
-
-func decode(d string) []byte {
-	hr, err := hex.DecodeString(d)
-	if err != nil {
-		return nil
-	}
-
-	br := bytes.NewReader(hr)
-	zr, err := zlib.NewReader(br)
-	if err != nil {
-		return nil
-	}
-
-	rbuf, err := ioutil.ReadAll(zr)
-	if err != nil {
-		return nil
-	}
-
-	return rbuf
-}
-
-func encodeEndpoints(en []*registry.Endpoint) []string {
-	var tags []string
-	for _, e := range en {
-		if b, err := json.Marshal(e); err == nil {
-			tags = append(tags, "e-"+encode(b))
-		}
-	}
-	return tags
-}
-
-func decodeEndpoints(tags []string) []*registry.Endpoint {
-	var en []*registry.Endpoint
-
-	// use the first format you find
-	var ver byte
-
-	for _, tag := range tags {
-		if len(tag) == 0 || tag[0] != 'e' {
-			continue
-		}
-
-		// check version
-		if ver > 0 && tag[1] != ver {
-			continue
-		}
-
-		var e *registry.Endpoint
-		var buf []byte
-
-		// Old encoding was plain
-		if tag[1] == '=' {
-			buf = []byte(tag[2:])
-		}
-
-		// New encoding is hex
-		if tag[1] == '-' {
-			buf = decode(tag[2:])
-		}
-
-		if err := json.Unmarshal(buf, &e); err == nil {
-			en = append(en, e)
-		}
-
-		// set version
-		ver = tag[1]
-	}
-	return en
-}
-
-func encodeMetadata(md map[string]string) []string {
-	var tags []string
-	for k, v := range md {
-		if b, err := json.Marshal(map[string]string{
-			k: v,
-		}); err == nil {
-			// new encoding
-			tags = append(tags, "t-"+encode(b))
-		}
-	}
-	return tags
-}
-
-func decodeMetadata(tags []string) map[string]string {
-	md := make(map[string]string)
-
-	var ver byte
-
-	for _, tag := range tags {
-		if len(tag) == 0 || tag[0] != 't' {
-			continue
-		}
-
-		// check version
-		if ver > 0 && tag[1] != ver {
-			continue
-		}
-
-		var kv map[string]string
-		var buf []byte
-
-		// Old encoding was plain
-		if tag[1] == '=' {
-			buf = []byte(tag[2:])
-		}
-
-		// New encoding is hex
-		if tag[1] == '-' {
-			buf = decode(tag[2:])
-		}
-
-		// Now unmarshal
-		if err := json.Unmarshal(buf, &kv); err == nil {
-			for k, v := range kv {
-				md[k] = v
-			}
-		}
-
-		// set version
-		ver = tag[1]
-	}
-	return md
-}
-
-func encodeVersion(v string) []string {
-	return []string{"v-" + encode([]byte(v))}
-}
-
-func decodeVersion(tags []string) (string, bool) {
-	for _, tag := range tags {
-		if len(tag) < 2 || tag[0] != 'v' {
-			continue
-		}
-
-		// Old encoding was plain
-		if tag[1] == '=' {
-			return tag[2:], true
-		}
-
-		// New encoding is hex
-		if tag[1] == '-' {
-			return string(decode(tag[2:])), true
-		}
-	}
-	return "", false
-}

registry/consul/encoding_test.go

@@ -1,147 +0,0 @@
-package consul
-
-import (
-	"encoding/json"
-	"testing"
-
-	"github.com/micro/go-micro/registry"
-)
-
-func TestEncodingEndpoints(t *testing.T) {
-	eps := []*registry.Endpoint{
-		&registry.Endpoint{
-			Name: "endpoint1",
-			Request: &registry.Value{
-				Name: "request",
-				Type: "request",
-			},
-			Response: &registry.Value{
-				Name: "response",
-				Type: "response",
-			},
-			Metadata: map[string]string{
-				"foo1": "bar1",
-			},
-		},
-		&registry.Endpoint{
-			Name: "endpoint2",
-			Request: &registry.Value{
-				Name: "request",
-				Type: "request",
-			},
-			Response: &registry.Value{
-				Name: "response",
-				Type: "response",
-			},
-			Metadata: map[string]string{
-				"foo2": "bar2",
-			},
-		},
-		&registry.Endpoint{
-			Name: "endpoint3",
-			Request: &registry.Value{
-				Name: "request",
-				Type: "request",
-			},
-			Response: &registry.Value{
-				Name: "response",
-				Type: "response",
-			},
-			Metadata: map[string]string{
-				"foo3": "bar3",
-			},
-		},
-	}
-
-	testEp := func(ep *registry.Endpoint, enc string) {
-		// encode endpoint
-		e := encodeEndpoints([]*registry.Endpoint{ep})
-
-		// check there are two tags; old and new
-		if len(e) != 1 {
-			t.Fatalf("Expected 1 encoded tags, got %v", e)
-		}
-
-		// check old encoding
-		var seen bool
-
-		for _, en := range e {
-			if en == enc {
-				seen = true
-				break
-			}
-		}
-
-		if !seen {
-			t.Fatalf("Expected %s but not found", enc)
-		}
-
-		// decode
-		d := decodeEndpoints([]string{enc})
-		if len(d) == 0 {
-			t.Fatalf("Expected %v got %v", ep, d)
-		}
-
-		// check name
-		if d[0].Name != ep.Name {
-			t.Fatalf("Expected ep %s got %s", ep.Name, d[0].Name)
-		}
-
-		// check all the metadata exists
-		for k, v := range ep.Metadata {
-			if gv := d[0].Metadata[k]; gv != v {
-				t.Fatalf("Expected key %s val %s got val %s", k, v, gv)
-			}
-		}
-	}
-
-	for _, ep := range eps {
-		// JSON encoded
-		jencoded, err := json.Marshal(ep)
-		if err != nil {
-			t.Fatal(err)
-		}
-
-		// HEX encoded
-		hencoded := encode(jencoded)
-		// endpoint tag
-		hepTag := "e-" + hencoded
-		testEp(ep, hepTag)
-	}
-}
-
-func TestEncodingVersion(t *testing.T) {
-	testData := []struct {
-		decoded string
-		encoded string
-	}{
-		{"1.0.0", "v-789c32d433d03300040000ffff02ce00ee"},
-		{"latest", "v-789cca492c492d2e01040000ffff08cc028e"},
-	}
-
-	for _, data := range testData {
-		e := encodeVersion(data.decoded)
-
-		if e[0] != data.encoded {
-			t.Fatalf("Expected %s got %s", data.encoded, e)
-		}
-
-		d, ok := decodeVersion(e)
-		if !ok {
-			t.Fatalf("Unexpected %t for %s", ok, data.encoded)
-		}
-
-		if d != data.decoded {
-			t.Fatalf("Expected %s got %s", data.decoded, d)
-		}
-
-		d, ok = decodeVersion([]string{data.encoded})
-		if !ok {
-			t.Fatalf("Unexpected %t for %s", ok, data.encoded)
-		}
-
-		if d != data.decoded {
-			t.Fatalf("Expected %s got %s", data.decoded, d)
-		}
-	}
-}

registry/consul/options.go

@@ -1,81 +0,0 @@
-package consul
-
-import (
-	"context"
-	"time"
-
-	consul "github.com/hashicorp/consul/api"
-	"github.com/micro/go-micro/registry"
-)
-
-// Connect specifies services should be registered as Consul Connect services
-func Connect() registry.Option {
-	return func(o *registry.Options) {
-		if o.Context == nil {
-			o.Context = context.Background()
-		}
-		o.Context = context.WithValue(o.Context, "consul_connect", true)
-	}
-}
-
-func Config(c *consul.Config) registry.Option {
-	return func(o *registry.Options) {
-		if o.Context == nil {
-			o.Context = context.Background()
-		}
-		o.Context = context.WithValue(o.Context, "consul_config", c)
-	}
-}
-
-// AllowStale sets whether any Consul server (non-leader) can service
-// a read. This allows for lower latency and higher throughput
-// at the cost of potentially stale data.
-// Works similar to Consul DNS Config option [1].
-// Defaults to true.
-//
-// [1] https://www.consul.io/docs/agent/options.html#allow_stale
-//
-func AllowStale(v bool) registry.Option {
-	return func(o *registry.Options) {
-		if o.Context == nil {
-			o.Context = context.Background()
-		}
-		o.Context = context.WithValue(o.Context, "consul_allow_stale", v)
-	}
-}
-
-// QueryOptions specifies the QueryOptions to be used when calling
-// Consul. See `Consul API` for more information [1].
-//
-// [1] https://godoc.org/github.com/hashicorp/consul/api#QueryOptions
-//
-func QueryOptions(q *consul.QueryOptions) registry.Option {
-	return func(o *registry.Options) {
-		if q == nil {
-			return
-		}
-		if o.Context == nil {
-			o.Context = context.Background()
-		}
-		o.Context = context.WithValue(o.Context, "consul_query_options", q)
-	}
-}
-
-//
-// TCPCheck will tell the service provider to check the service address
-// and port every `t` interval. It will enabled only if `t` is greater than 0.
-// See `TCP + Interval` for more information [1].
-//
-// [1] https://www.consul.io/docs/agent/checks.html
-//
-func TCPCheck(t time.Duration) registry.Option {
-	return func(o *registry.Options) {
-		if t <= time.Duration(0) {
-			return
-		}
-		if o.Context == nil {
-			o.Context = context.Background()
-		}
-		o.Context = context.WithValue(o.Context, "consul_tcp_check", t)
-	}
-}

registry/consul/registry_test.go

@@ -1,208 +0,0 @@
-package consul
-
-import (
-	"bytes"
-	"encoding/json"
-	"errors"
-	"net"
-	"net/http"
-	"testing"
-	"time"
-
-	consul "github.com/hashicorp/consul/api"
-	"github.com/micro/go-micro/registry"
-)
-
-type mockRegistry struct {
-	body   []byte
-	status int
-	err    error
-	url    string
-}
-
-func encodeData(obj interface{}) ([]byte, error) {
-	buf := bytes.NewBuffer(nil)
-	enc := json.NewEncoder(buf)
-	if err := enc.Encode(obj); err != nil {
-		return nil, err
-	}
-	return buf.Bytes(), nil
-}
-
-func newMockServer(rg *mockRegistry, l net.Listener) error {
-	mux := http.NewServeMux()
-	mux.HandleFunc(rg.url, func(w http.ResponseWriter, r *http.Request) {
-		if rg.err != nil {
-			http.Error(w, rg.err.Error(), 500)
-			return
-		}
-		w.WriteHeader(rg.status)
-		w.Write(rg.body)
-	})
-	return http.Serve(l, mux)
-}
-
-func newConsulTestRegistry(r *mockRegistry) (*consulRegistry, func()) {
-	l, err := net.Listen("tcp", "localhost:0")
-	if err != nil {
-		// blurgh?!!
-		panic(err.Error())
-	}
-	cfg := consul.DefaultConfig()
-	cfg.Address = l.Addr().String()
-
-	go newMockServer(r, l)
-
-	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 {
-	bts, _ := encodeData(svc)
-	return bts
-}
-
-func TestConsul_GetService_WithError(t *testing.T) {
-	cr, cl := newConsulTestRegistry(&mockRegistry{
-		err: errors.New("client-error"),
-		url: "/v1/health/service/service-name",
-	})
-	defer cl()
-
-	if _, err := cr.GetService("test-service"); err == nil {
-		t.Fatalf("Expected error not to be `nil`")
-	}
-}
-
-func TestConsul_GetService_WithHealthyServiceNodes(t *testing.T) {
-	// warning is still seen as healthy, critical is not
-	svcs := []*consul.ServiceEntry{
-		newServiceEntry(
-			"node-name-1", "node-address-1", "service-name", "v1.0.0",
-			[]*consul.HealthCheck{
-				newHealthCheck("node-name-1", "service-name", "passing"),
-				newHealthCheck("node-name-1", "service-name", "warning"),
-			},
-		),
-		newServiceEntry(
-			"node-name-2", "node-address-2", "service-name", "v1.0.0",
-			[]*consul.HealthCheck{
-				newHealthCheck("node-name-2", "service-name", "passing"),
-				newHealthCheck("node-name-2", "service-name", "warning"),
-			},
-		),
-	}
-
-	cr, cl := newConsulTestRegistry(&mockRegistry{
-		status: 200,
-		body:   newServiceList(svcs),
-		url:    "/v1/health/service/service-name",
-	})
-	defer cl()
-
-	svc, err := cr.GetService("service-name")
-	if err != nil {
-		t.Fatal("Unexpected error", err)
-	}
-
-	if exp, act := 1, len(svc); exp != act {
-		t.Fatalf("Expected len of svc to be `%d`, got `%d`.", exp, act)
-	}
-
-	if exp, act := 2, len(svc[0].Nodes); exp != act {
-		t.Fatalf("Expected len of nodes to be `%d`, got `%d`.", exp, act)
-	}
-}
-
-func TestConsul_GetService_WithUnhealthyServiceNode(t *testing.T) {
-	// warning is still seen as healthy, critical is not
-	svcs := []*consul.ServiceEntry{
-		newServiceEntry(
-			"node-name-1", "node-address-1", "service-name", "v1.0.0",
-			[]*consul.HealthCheck{
-				newHealthCheck("node-name-1", "service-name", "passing"),
-				newHealthCheck("node-name-1", "service-name", "warning"),
-			},
-		),
-		newServiceEntry(
-			"node-name-2", "node-address-2", "service-name", "v1.0.0",
-			[]*consul.HealthCheck{
-				newHealthCheck("node-name-2", "service-name", "passing"),
-				newHealthCheck("node-name-2", "service-name", "critical"),
-			},
-		),
-	}
-
-	cr, cl := newConsulTestRegistry(&mockRegistry{
-		status: 200,
-		body:   newServiceList(svcs),
-		url:    "/v1/health/service/service-name",
-	})
-	defer cl()
-
-	svc, err := cr.GetService("service-name")
-	if err != nil {
-		t.Fatal("Unexpected error", err)
-	}
-
-	if exp, act := 1, len(svc); exp != act {
-		t.Fatalf("Expected len of svc to be `%d`, got `%d`.", exp, act)
-	}
-
-	if exp, act := 1, len(svc[0].Nodes); exp != act {
-		t.Fatalf("Expected len of nodes to be `%d`, got `%d`.", exp, act)
-	}
-}
-
-func TestConsul_GetService_WithUnhealthyServiceNodes(t *testing.T) {
-	// warning is still seen as healthy, critical is not
-	svcs := []*consul.ServiceEntry{
-		newServiceEntry(
-			"node-name-1", "node-address-1", "service-name", "v1.0.0",
-			[]*consul.HealthCheck{
-				newHealthCheck("node-name-1", "service-name", "passing"),
-				newHealthCheck("node-name-1", "service-name", "critical"),
-			},
-		),
-		newServiceEntry(
-			"node-name-2", "node-address-2", "service-name", "v1.0.0",
-			[]*consul.HealthCheck{
-				newHealthCheck("node-name-2", "service-name", "passing"),
-				newHealthCheck("node-name-2", "service-name", "critical"),
-			},
-		),
-	}
-
-	cr, cl := newConsulTestRegistry(&mockRegistry{
-		status: 200,
-		body:   newServiceList(svcs),
-		url:    "/v1/health/service/service-name",
-	})
-	defer cl()
-
-	svc, err := cr.GetService("service-name")
-	if err != nil {
-		t.Fatal("Unexpected error", err)
-	}
-
-	if exp, act := 1, len(svc); exp != act {
-		t.Fatalf("Expected len of svc to be `%d`, got `%d`.", exp, act)
-	}
-
-	if exp, act := 0, len(svc[0].Nodes); exp != act {
-		t.Fatalf("Expected len of nodes to be `%d`, got `%d`.", exp, act)
-	}
-}

registry/consul/watcher.go

@@ -1,290 +0,0 @@
-package consul
-
-import (
-	"fmt"
-	"log"
-	"os"
-	"sync"
-
-	"github.com/hashicorp/consul/api"
-	"github.com/hashicorp/consul/api/watch"
-	"github.com/micro/go-micro/registry"
-)
-
-type consulWatcher struct {
-	r        *consulRegistry
-	wo       registry.WatchOptions
-	wp       *watch.Plan
-	watchers map[string]*watch.Plan
-
-	next chan *registry.Result
-	exit chan bool
-
-	sync.RWMutex
-	services map[string][]*registry.Service
-}
-
-func newConsulWatcher(cr *consulRegistry, opts ...registry.WatchOption) (registry.Watcher, error) {
-	var wo registry.WatchOptions
-	for _, o := range opts {
-		o(&wo)
-	}
-
-	cw := &consulWatcher{
-		r:        cr,
-		wo:       wo,
-		exit:     make(chan bool),
-		next:     make(chan *registry.Result, 10),
-		watchers: make(map[string]*watch.Plan),
-		services: make(map[string][]*registry.Service),
-	}
-
-	wp, err := watch.Parse(map[string]interface{}{"type": "services"})
-	if err != nil {
-		return nil, err
-	}
-
-	wp.Handler = cw.handle
-	go wp.RunWithClientAndLogger(cr.Client(), log.New(os.Stderr, "", log.LstdFlags))
-	cw.wp = wp
-
-	return cw, nil
-}
-
-func (cw *consulWatcher) serviceHandler(idx uint64, data interface{}) {
-	entries, ok := data.([]*api.ServiceEntry)
-	if !ok {
-		return
-	}
-
-	serviceMap := map[string]*registry.Service{}
-	serviceName := ""
-
-	for _, e := range entries {
-		serviceName = e.Service.Service
-		// version is now a tag
-		version, _ := decodeVersion(e.Service.Tags)
-		// service ID is now the node id
-		id := e.Service.ID
-		// key is always the version
-		key := version
-		// address is service address
-		address := e.Service.Address
-
-		// use node address
-		if len(address) == 0 {
-			address = e.Node.Address
-		}
-
-		svc, ok := serviceMap[key]
-		if !ok {
-			svc = &registry.Service{
-				Endpoints: decodeEndpoints(e.Service.Tags),
-				Name:      e.Service.Service,
-				Version:   version,
-			}
-			serviceMap[key] = svc
-		}
-
-		var del bool
-
-		for _, check := range e.Checks {
-			// delete the node if the status is critical
-			if check.Status == "critical" {
-				del = true
-				break
-			}
-		}
-
-		// if delete then skip the node
-		if del {
-			continue
-		}
-
-		svc.Nodes = append(svc.Nodes, &registry.Node{
-			Id:       id,
-			Address:  fmt.Sprintf("%s:%d", address, e.Service.Port),
-			Metadata: decodeMetadata(e.Service.Tags),
-		})
-	}
-
-	cw.RLock()
-	// make a copy
-	rservices := make(map[string][]*registry.Service)
-	for k, v := range cw.services {
-		rservices[k] = v
-	}
-	cw.RUnlock()
-
-	var newServices []*registry.Service
-
-	// serviceMap is the new set of services keyed by name+version
-	for _, newService := range serviceMap {
-		// append to the new set of cached services
-		newServices = append(newServices, newService)
-
-		// check if the service exists in the existing cache
-		oldServices, ok := rservices[serviceName]
-		if !ok {
-			// does not exist? then we're creating brand new entries
-			cw.next <- &registry.Result{Action: "create", Service: newService}
-			continue
-		}
-
-		// service exists. ok let's figure out what to update and delete version wise
-		action := "create"
-
-		for _, oldService := range oldServices {
-			// does this version exist?
-			// no? then default to create
-			if oldService.Version != newService.Version {
-				continue
-			}
-
-			// yes? then it's an update
-			action = "update"
-
-			var nodes []*registry.Node
-			// check the old nodes to see if they've been deleted
-			for _, oldNode := range oldService.Nodes {
-				var seen bool
-				for _, newNode := range newService.Nodes {
-					if newNode.Id == oldNode.Id {
-						seen = true
-						break
-					}
-				}
-				// does the old node exist in the new set of nodes
-				// no? then delete that shit
-				if !seen {
-					nodes = append(nodes, oldNode)
-				}
-			}
-
-			// it's an update rather than creation
-			if len(nodes) > 0 {
-				delService := oldService
-				delService.Nodes = nodes
-				cw.next <- &registry.Result{Action: "delete", Service: delService}
-			}
-		}
-
-		cw.next <- &registry.Result{Action: action, Service: newService}
-	}
-
-	// Now check old versions that may not be in new services map
-	for _, old := range rservices[serviceName] {
-		// old version does not exist in new version map
-		// kill it with fire!
-		if _, ok := serviceMap[old.Version]; !ok {
-			cw.next <- &registry.Result{Action: "delete", Service: old}
-		}
-	}
-
-	cw.Lock()
-	cw.services[serviceName] = newServices
-	cw.Unlock()
-}
-
-func (cw *consulWatcher) handle(idx uint64, data interface{}) {
-	services, ok := data.(map[string][]string)
-	if !ok {
-		return
-	}
-
-	// add new watchers
-	for service, _ := range services {
-		// Filter on watch options
-		// wo.Service: Only watch services we care about
-		if len(cw.wo.Service) > 0 && service != cw.wo.Service {
-			continue
-		}
-
-		if _, ok := cw.watchers[service]; ok {
-			continue
-		}
-		wp, err := watch.Parse(map[string]interface{}{
-			"type":    "service",
-			"service": service,
-		})
-		if err == nil {
-			wp.Handler = cw.serviceHandler
-			go wp.RunWithClientAndLogger(cw.r.Client(), log.New(os.Stderr, "", log.LstdFlags))
-			cw.watchers[service] = wp
-			cw.next <- &registry.Result{Action: "create", Service: &registry.Service{Name: service}}
-		}
-	}
-
-	cw.RLock()
-	// make a copy
-	rservices := make(map[string][]*registry.Service)
-	for k, v := range cw.services {
-		rservices[k] = v
-	}
-	cw.RUnlock()
-
-	// remove unknown services from registry
-	// save the things we want to delete
-	deleted := make(map[string][]*registry.Service)
-
-	for service, _ := range rservices {
-		if _, ok := services[service]; !ok {
-			cw.Lock()
-			// save this before deleting
-			deleted[service] = cw.services[service]
-			delete(cw.services, service)
-			cw.Unlock()
-		}
-	}
-
-	// remove unknown services from watchers
-	for service, w := range cw.watchers {
-		if _, ok := services[service]; !ok {
-			w.Stop()
-			delete(cw.watchers, service)
-			for _, oldService := range deleted[service] {
-				// send a delete for the service nodes that we're removing
-				cw.next <- &registry.Result{Action: "delete", Service: oldService}
-			}
-			// sent the empty list as the last resort to indicate to delete the entire service
-			cw.next <- &registry.Result{Action: "delete", Service: &registry.Service{Name: service}}
-		}
-	}
-}
-
-func (cw *consulWatcher) Next() (*registry.Result, error) {
-	select {
-	case <-cw.exit:
-		return nil, registry.ErrWatcherStopped
-	case r, ok := <-cw.next:
-		if !ok {
-			return nil, registry.ErrWatcherStopped
-		}
-		return r, nil
-	}
-	// NOTE: This is a dead code path: e.g. it will never be reached
-	// as we return in all previous code paths never leading to this return
-	return nil, registry.ErrWatcherStopped
-}
-
-func (cw *consulWatcher) Stop() {
-	select {
-	case <-cw.exit:
-		return
-	default:
-		close(cw.exit)
-		if cw.wp == nil {
-			return
-		}
-		cw.wp.Stop()
-
-		// drain results
-		for {
-			select {
-			case <-cw.next:
-			default:
-				return
-			}
-		}
-	}
-}

registry/consul/watcher_test.go

@@ -1,86 +0,0 @@
-package consul
-
-import (
-	"testing"
-
-	"github.com/hashicorp/consul/api"
-	"github.com/micro/go-micro/registry"
-)
-
-func TestHealthyServiceHandler(t *testing.T) {
-	watcher := newWatcher()
-	serviceEntry := newServiceEntry(
-		"node-name", "node-address", "service-name", "v1.0.0",
-		[]*api.HealthCheck{
-			newHealthCheck("node-name", "service-name", "passing"),
-		},
-	)
-
-	watcher.serviceHandler(1234, []*api.ServiceEntry{serviceEntry})
-
-	if len(watcher.services["service-name"][0].Nodes) != 1 {
-		t.Errorf("Expected length of the service nodes to be 1")
-	}
-}
-
-func TestUnhealthyServiceHandler(t *testing.T) {
-	watcher := newWatcher()
-	serviceEntry := newServiceEntry(
-		"node-name", "node-address", "service-name", "v1.0.0",
-		[]*api.HealthCheck{
-			newHealthCheck("node-name", "service-name", "critical"),
-		},
-	)
-
-	watcher.serviceHandler(1234, []*api.ServiceEntry{serviceEntry})
-
-	if len(watcher.services["service-name"][0].Nodes) != 0 {
-		t.Errorf("Expected length of the service nodes to be 0")
-	}
-}
-
-func TestUnhealthyNodeServiceHandler(t *testing.T) {
-	watcher := newWatcher()
-	serviceEntry := newServiceEntry(
-		"node-name", "node-address", "service-name", "v1.0.0",
-		[]*api.HealthCheck{
-			newHealthCheck("node-name", "service-name", "passing"),
-			newHealthCheck("node-name", "serfHealth", "critical"),
-		},
-	)
-
-	watcher.serviceHandler(1234, []*api.ServiceEntry{serviceEntry})
-
-	if len(watcher.services["service-name"][0].Nodes) != 0 {
-		t.Errorf("Expected length of the service nodes to be 0")
-	}
-}
-
-func newWatcher() *consulWatcher {
-	return &consulWatcher{
-		exit:     make(chan bool),
-		next:     make(chan *registry.Result, 10),
-		services: make(map[string][]*registry.Service),
-	}
-}
-
-func newHealthCheck(node, name, status string) *api.HealthCheck {
-	return &api.HealthCheck{
-		Node:        node,
-		Name:        name,
-		Status:      status,
-		ServiceName: name,
-	}
-}
-
-func newServiceEntry(node, address, name, version string, checks []*api.HealthCheck) *api.ServiceEntry {
-	return &api.ServiceEntry{
-		Node: &api.Node{Node: node, Address: name},
-		Service: &api.AgentService{
-			Service: name,
-			Address: address,
-			Tags:    encodeVersion(version),
-		},
-		Checks: checks,
-	}
-}

registry/encoding_test.go

@@ -6,13 +6,13 @@ import (
 
 func TestEncoding(t *testing.T) {
 	testData := []*mdnsTxt{
-		&mdnsTxt{
+		{
 			Version: "1.0.0",
 			Metadata: map[string]string{
 				"foo": "bar",
 			},
 			Endpoints: []*Endpoint{
-				&Endpoint{
+				{
 					Name: "endpoint1",
 					Request: &Value{
 						Name: "request",

registry/etcd/etcd.go

@@ -0,0 +1,398 @@
+// Package etcd provides an etcd service registry
+package etcd
+
+import (
+	"context"
+	"crypto/tls"
+	"encoding/json"
+	"errors"
+	"net"
+	"path"
+	"sort"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/coreos/etcd/clientv3"
+	"github.com/coreos/etcd/etcdserver/api/v3rpc/rpctypes"
+	"github.com/micro/go-micro/registry"
+	"github.com/micro/go-micro/util/log"
+	hash "github.com/mitchellh/hashstructure"
+)
+
+var (
+	prefix = "/micro/registry/"
+)
+
+type etcdRegistry struct {
+	client  *clientv3.Client
+	options registry.Options
+
+	sync.RWMutex
+	register map[string]uint64
+	leases   map[string]clientv3.LeaseID
+}
+
+func NewRegistry(opts ...registry.Option) registry.Registry {
+	e := &etcdRegistry{
+		options:  registry.Options{},
+		register: make(map[string]uint64),
+		leases:   make(map[string]clientv3.LeaseID),
+	}
+	configure(e, opts...)
+	return e
+}
+
+func configure(e *etcdRegistry, opts ...registry.Option) error {
+	config := clientv3.Config{
+		Endpoints: []string{"127.0.0.1:2379"},
+	}
+
+	for _, o := range opts {
+		o(&e.options)
+	}
+
+	if e.options.Timeout == 0 {
+		e.options.Timeout = 5 * time.Second
+	}
+
+	if e.options.Secure || e.options.TLSConfig != nil {
+		tlsConfig := e.options.TLSConfig
+		if tlsConfig == nil {
+			tlsConfig = &tls.Config{
+				InsecureSkipVerify: true,
+			}
+		}
+
+		config.TLS = tlsConfig
+	}
+
+	if e.options.Context != nil {
+		u, ok := e.options.Context.Value(authKey{}).(*authCreds)
+		if ok {
+			config.Username = u.Username
+			config.Password = u.Password
+		}
+	}
+
+	var cAddrs []string
+
+	for _, address := range e.options.Addrs {
+		if len(address) == 0 {
+			continue
+		}
+		addr, port, err := net.SplitHostPort(address)
+		if ae, ok := err.(*net.AddrError); ok && ae.Err == "missing port in address" {
+			port = "2379"
+			addr = address
+			cAddrs = append(cAddrs, net.JoinHostPort(addr, port))
+		} else if err == nil {
+			cAddrs = append(cAddrs, net.JoinHostPort(addr, port))
+		}
+	}
+
+	// if we got addrs then we'll update
+	if len(cAddrs) > 0 {
+		config.Endpoints = cAddrs
+	}
+
+	cli, err := clientv3.New(config)
+	if err != nil {
+		return err
+	}
+	e.client = cli
+	return nil
+}
+
+func encode(s *registry.Service) string {
+	b, _ := json.Marshal(s)
+	return string(b)
+}
+
+func decode(ds []byte) *registry.Service {
+	var s *registry.Service
+	json.Unmarshal(ds, &s)
+	return s
+}
+
+func nodePath(s, id string) string {
+	service := strings.Replace(s, "/", "-", -1)
+	node := strings.Replace(id, "/", "-", -1)
+	return path.Join(prefix, service, node)
+}
+
+func servicePath(s string) string {
+	return path.Join(prefix, strings.Replace(s, "/", "-", -1))
+}
+
+func (e *etcdRegistry) Init(opts ...registry.Option) error {
+	return configure(e, opts...)
+}
+
+func (e *etcdRegistry) Options() registry.Options {
+	return e.options
+}
+
+func (e *etcdRegistry) registerNode(s *registry.Service, node *registry.Node, opts ...registry.RegisterOption) error {
+	if len(s.Nodes) == 0 {
+		return errors.New("Require at least one node")
+	}
+
+	// check existing lease cache
+	e.RLock()
+	leaseID, ok := e.leases[s.Name+node.Id]
+	e.RUnlock()
+
+	if !ok {
+		// missing lease, check if the key exists
+		ctx, cancel := context.WithTimeout(context.Background(), e.options.Timeout)
+		defer cancel()
+
+		// look for the existing key
+		rsp, err := e.client.Get(ctx, nodePath(s.Name, node.Id), clientv3.WithSerializable())
+		if err != nil {
+			return err
+		}
+
+		// get the existing lease
+		for _, kv := range rsp.Kvs {
+			if kv.Lease > 0 {
+				leaseID = clientv3.LeaseID(kv.Lease)
+
+				// decode the existing node
+				srv := decode(kv.Value)
+				if srv == nil || len(srv.Nodes) == 0 {
+					continue
+				}
+
+				// create hash of service; uint64
+				h, err := hash.Hash(srv.Nodes[0], nil)
+				if err != nil {
+					continue
+				}
+
+				// save the info
+				e.Lock()
+				e.leases[s.Name+node.Id] = leaseID
+				e.register[s.Name+node.Id] = h
+				e.Unlock()
+
+				break
+			}
+		}
+	}
+
+	var leaseNotFound bool
+
+	// renew the lease if it exists
+	if leaseID > 0 {
+		log.Tracef("Renewing existing lease for %s %d", s.Name, leaseID)
+		if _, err := e.client.KeepAliveOnce(context.TODO(), leaseID); err != nil {
+			if err != rpctypes.ErrLeaseNotFound {
+				return err
+			}
+
+			log.Tracef("Lease not found for %s %d", s.Name, leaseID)
+			// lease not found do register
+			leaseNotFound = true
+		}
+	}
+
+	// create hash of service; uint64
+	h, err := hash.Hash(node, nil)
+	if err != nil {
+		return err
+	}
+
+	// get existing hash for the service node
+	e.Lock()
+	v, ok := e.register[s.Name+node.Id]
+	e.Unlock()
+
+	// the service is unchanged, skip registering
+	if ok && v == h && !leaseNotFound {
+		log.Tracef("Service %s node %s unchanged skipping registration", s.Name, node.Id)
+		return nil
+	}
+
+	service := &registry.Service{
+		Name:      s.Name,
+		Version:   s.Version,
+		Metadata:  s.Metadata,
+		Endpoints: s.Endpoints,
+		Nodes:     []*registry.Node{node},
+	}
+
+	var options registry.RegisterOptions
+	for _, o := range opts {
+		o(&options)
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), e.options.Timeout)
+	defer cancel()
+
+	var lgr *clientv3.LeaseGrantResponse
+	if options.TTL.Seconds() > 0 {
+		// get a lease used to expire keys since we have a ttl
+		lgr, err = e.client.Grant(ctx, int64(options.TTL.Seconds()))
+		if err != nil {
+			return err
+		}
+	}
+
+	log.Tracef("Registering %s id %s with lease %v and ttl %v", service.Name, node.Id, lgr, options.TTL)
+	// create an entry for the node
+	if lgr != nil {
+		_, err = e.client.Put(ctx, nodePath(service.Name, node.Id), encode(service), clientv3.WithLease(lgr.ID))
+	} else {
+		_, err = e.client.Put(ctx, nodePath(service.Name, node.Id), encode(service))
+	}
+	if err != nil {
+		return err
+	}
+
+	e.Lock()
+	// save our hash of the service
+	e.register[s.Name+node.Id] = h
+	// save our leaseID of the service
+	if lgr != nil {
+		e.leases[s.Name+node.Id] = lgr.ID
+	}
+	e.Unlock()
+
+	return nil
+}
+
+func (e *etcdRegistry) Deregister(s *registry.Service) error {
+	if len(s.Nodes) == 0 {
+		return errors.New("Require at least one node")
+	}
+
+	for _, node := range s.Nodes {
+		e.Lock()
+		// delete our hash of the service
+		delete(e.register, s.Name+node.Id)
+		// delete our lease of the service
+		delete(e.leases, s.Name+node.Id)
+		e.Unlock()
+
+		ctx, cancel := context.WithTimeout(context.Background(), e.options.Timeout)
+		defer cancel()
+
+		log.Tracef("Deregistering %s id %s", s.Name, node.Id)
+		_, err := e.client.Delete(ctx, nodePath(s.Name, node.Id))
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (e *etcdRegistry) Register(s *registry.Service, opts ...registry.RegisterOption) error {
+	if len(s.Nodes) == 0 {
+		return errors.New("Require at least one node")
+	}
+
+	var gerr error
+
+	// register each node individually
+	for _, node := range s.Nodes {
+		err := e.registerNode(s, node, opts...)
+		if err != nil {
+			gerr = err
+		}
+	}
+
+	return gerr
+}
+
+func (e *etcdRegistry) GetService(name string) ([]*registry.Service, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), e.options.Timeout)
+	defer cancel()
+
+	rsp, err := e.client.Get(ctx, servicePath(name)+"/", clientv3.WithPrefix(), clientv3.WithSerializable())
+	if err != nil {
+		return nil, err
+	}
+
+	if len(rsp.Kvs) == 0 {
+		return nil, registry.ErrNotFound
+	}
+
+	serviceMap := map[string]*registry.Service{}
+
+	for _, n := range rsp.Kvs {
+		if sn := decode(n.Value); sn != nil {
+			s, ok := serviceMap[sn.Version]
+			if !ok {
+				s = &registry.Service{
+					Name:      sn.Name,
+					Version:   sn.Version,
+					Metadata:  sn.Metadata,
+					Endpoints: sn.Endpoints,
+				}
+				serviceMap[s.Version] = s
+			}
+
+			for _, node := range sn.Nodes {
+				s.Nodes = append(s.Nodes, node)
+			}
+		}
+	}
+
+	var services []*registry.Service
+	for _, service := range serviceMap {
+		services = append(services, service)
+	}
+
+	return services, nil
+}
+
+func (e *etcdRegistry) ListServices() ([]*registry.Service, error) {
+	var services []*registry.Service
+	versions := make(map[string]*registry.Service)
+
+	ctx, cancel := context.WithTimeout(context.Background(), e.options.Timeout)
+	defer cancel()
+
+	rsp, err := e.client.Get(ctx, prefix, clientv3.WithPrefix(), clientv3.WithSerializable())
+	if err != nil {
+		return nil, err
+	}
+
+	if len(rsp.Kvs) == 0 {
+		return []*registry.Service{}, nil
+	}
+
+	for _, n := range rsp.Kvs {
+		sn := decode(n.Value)
+		if sn == nil {
+			continue
+		}
+		v, ok := versions[sn.Name+sn.Version]
+		if !ok {
+			versions[sn.Name+sn.Version] = sn
+			continue
+		}
+		// append to service:version nodes
+		v.Nodes = append(v.Nodes, sn.Nodes...)
+	}
+
+	for _, service := range versions {
+		services = append(services, service)
+	}
+
+	// sort the services
+	sort.Slice(services, func(i, j int) bool { return services[i].Name < services[j].Name })
+
+	return services, nil
+}
+
+func (e *etcdRegistry) Watch(opts ...registry.WatchOption) (registry.Watcher, error) {
+	return newEtcdWatcher(e, e.options.Timeout, opts...)
+}
+
+func (e *etcdRegistry) String() string {
+	return "etcd"
+}

registry/etcd/options.go

@@ -0,0 +1,24 @@
+package etcd
+
+import (
+	"context"
+
+	"github.com/micro/go-micro/registry"
+)
+
+type authKey struct{}
+
+type authCreds struct {
+	Username string
+	Password string
+}
+
+// Auth allows you to specify username/password
+func Auth(username, password string) registry.Option {
+	return func(o *registry.Options) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, authKey{}, &authCreds{Username: username, Password: password})
+	}
+}

registry/etcd/watcher.go

@@ -0,0 +1,88 @@
+package etcd
+
+import (
+	"context"
+	"errors"
+	"time"
+
+	"github.com/coreos/etcd/clientv3"
+	"github.com/micro/go-micro/registry"
+)
+
+type etcdWatcher struct {
+	stop    chan bool
+	w       clientv3.WatchChan
+	client  *clientv3.Client
+	timeout time.Duration
+}
+
+func newEtcdWatcher(r *etcdRegistry, timeout time.Duration, opts ...registry.WatchOption) (registry.Watcher, error) {
+	var wo registry.WatchOptions
+	for _, o := range opts {
+		o(&wo)
+	}
+
+	ctx, cancel := context.WithCancel(context.Background())
+	stop := make(chan bool, 1)
+
+	go func() {
+		<-stop
+		cancel()
+	}()
+
+	watchPath := prefix
+	if len(wo.Service) > 0 {
+		watchPath = servicePath(wo.Service) + "/"
+	}
+
+	return &etcdWatcher{
+		stop:    stop,
+		w:       r.client.Watch(ctx, watchPath, clientv3.WithPrefix(), clientv3.WithPrevKV()),
+		client:  r.client,
+		timeout: timeout,
+	}, nil
+}
+
+func (ew *etcdWatcher) Next() (*registry.Result, error) {
+	for wresp := range ew.w {
+		if wresp.Err() != nil {
+			return nil, wresp.Err()
+		}
+		for _, ev := range wresp.Events {
+			service := decode(ev.Kv.Value)
+			var action string
+
+			switch ev.Type {
+			case clientv3.EventTypePut:
+				if ev.IsCreate() {
+					action = "create"
+				} else if ev.IsModify() {
+					action = "update"
+				}
+			case clientv3.EventTypeDelete:
+				action = "delete"
+
+				// get service from prevKv
+				service = decode(ev.PrevKv.Value)
+			}
+
+			if service == nil {
+				continue
+			}
+			return &registry.Result{
+				Action:  action,
+				Service: service,
+			}, nil
+		}
+	}
+	return nil, errors.New("could not get next")
+}
+
+func (ew *etcdWatcher) Stop() {
+	select {
+	case <-ew.stop:
+		return
+	default:
+		close(ew.stop)
+	}
+}

registry/gossip/README.md

@@ -1,24 +0,0 @@
-# Gossip Registry
-
-Gossip is a zero dependency registry which uses github.com/hashicorp/memberlist to broadcast registry information 
-via the SWIM protocol. 
-
-## Usage
-
-Start with the registry flag or env var
-
-```bash
-MICRO_REGISTRY=gossip go run service.go
-```
-
-On startup you'll see something like
-
-```bash
-2018/12/06 18:17:48 Registry Listening on 192.168.1.65:56390
-```
-
-To join this gossip ring set the registry address using flag or env var
-
-```bash
-MICRO_REGISTRY_ADDRESS=192.168.1.65:56390
-```

registry/gossip/gossip.go

@@ -1,843 +0,0 @@
-// Package gossip provides a gossip registry based on hashicorp/memberlist
-package gossip
-
-import (
-	"context"
-	"encoding/json"
-	"fmt"
-	"io/ioutil"
-	"net"
-	"os"
-	"strconv"
-	"strings"
-	"sync"
-	"time"
-
-	"github.com/golang/protobuf/proto"
-	"github.com/google/uuid"
-	"github.com/hashicorp/memberlist"
-	"github.com/micro/go-micro/registry"
-	pb "github.com/micro/go-micro/registry/gossip/proto"
-	log "github.com/micro/go-micro/util/log"
-	"github.com/mitchellh/hashstructure"
-)
-
-// use registry.Result int32 values after it switches from string to int32 types
-// type actionType int32
-// type updateType int32
-
-const (
-	actionTypeInvalid int32 = iota
-	actionTypeCreate
-	actionTypeDelete
-	actionTypeUpdate
-	actionTypeSync
-)
-
-const (
-	nodeActionUnknown int32 = iota
-	nodeActionJoin
-	nodeActionLeave
-	nodeActionUpdate
-)
-
-func actionTypeString(t int32) string {
-	switch t {
-	case actionTypeCreate:
-		return "create"
-	case actionTypeDelete:
-		return "delete"
-	case actionTypeUpdate:
-		return "update"
-	case actionTypeSync:
-		return "sync"
-	}
-	return "invalid"
-}
-
-const (
-	updateTypeInvalid int32 = iota
-	updateTypeService
-)
-
-type broadcast struct {
-	update *pb.Update
-	notify chan<- struct{}
-}
-
-type delegate struct {
-	queue   *memberlist.TransmitLimitedQueue
-	updates chan *update
-}
-
-type event struct {
-	action int32
-	node   string
-}
-
-type eventDelegate struct {
-	events chan *event
-}
-
-func (ed *eventDelegate) NotifyJoin(n *memberlist.Node) {
-	ed.events <- &event{action: nodeActionJoin, node: n.Address()}
-}
-func (ed *eventDelegate) NotifyLeave(n *memberlist.Node) {
-	ed.events <- &event{action: nodeActionLeave, node: n.Address()}
-}
-func (ed *eventDelegate) NotifyUpdate(n *memberlist.Node) {
-	ed.events <- &event{action: nodeActionUpdate, node: n.Address()}
-}
-
-type gossipRegistry struct {
-	queue       *memberlist.TransmitLimitedQueue
-	updates     chan *update
-	events      chan *event
-	options     registry.Options
-	member      *memberlist.Memberlist
-	interval    time.Duration
-	tcpInterval time.Duration
-
-	connectRetry   bool
-	connectTimeout time.Duration
-	sync.RWMutex
-	services map[string][]*registry.Service
-
-	watchers map[string]chan *registry.Result
-
-	mtu     int
-	addrs   []string
-	members map[string]int32
-	done    chan bool
-}
-
-type update struct {
-	Update  *pb.Update
-	Service *registry.Service
-	sync    chan *registry.Service
-}
-
-type updates struct {
-	sync.RWMutex
-	services map[uint64]*update
-}
-
-var (
-	// You should change this if using secure
-	DefaultSecret = []byte("micro-gossip-key") // exactly 16 bytes
-	ExpiryTick    = time.Second * 1            // needs to be smaller than registry.RegisterTTL
-	MaxPacketSize = 512
-)
-
-func configure(g *gossipRegistry, opts ...registry.Option) error {
-	// loop through address list and get valid entries
-	addrs := func(curAddrs []string) []string {
-		var newAddrs []string
-		for _, addr := range curAddrs {
-			if trimAddr := strings.TrimSpace(addr); len(trimAddr) > 0 {
-				newAddrs = append(newAddrs, trimAddr)
-			}
-		}
-		return newAddrs
-	}
-
-	// current address list
-	curAddrs := addrs(g.options.Addrs)
-
-	// parse options
-	for _, o := range opts {
-		o(&g.options)
-	}
-
-	// new address list
-	newAddrs := addrs(g.options.Addrs)
-
-	// no new nodes and existing member. no configure
-	if (len(newAddrs) == len(curAddrs)) && g.member != nil {
-		return nil
-	}
-
-	// shutdown old member
-	g.Stop()
-
-	// lock internals
-	g.Lock()
-
-	// new done chan
-	g.done = make(chan bool)
-
-	// replace addresses
-	curAddrs = newAddrs
-
-	// create a new default config
-	c := memberlist.DefaultLocalConfig()
-
-	// sane good default options
-	c.LogOutput = ioutil.Discard // log to /dev/null
-	c.PushPullInterval = 0       // disable expensive tcp push/pull
-	c.ProtocolVersion = 4        // suport latest stable features
-
-	// set config from options
-	if config, ok := g.options.Context.Value(configKey{}).(*memberlist.Config); ok && config != nil {
-		c = config
-	}
-
-	// set address
-	if address, ok := g.options.Context.Value(addressKey{}).(string); ok {
-		host, port, err := net.SplitHostPort(address)
-		if err == nil {
-			p, err := strconv.Atoi(port)
-			if err == nil {
-				c.BindPort = p
-			}
-			c.BindAddr = host
-		}
-	} else {
-		// set bind to random port
-		c.BindPort = 0
-	}
-
-	// set the advertise address
-	if advertise, ok := g.options.Context.Value(advertiseKey{}).(string); ok {
-		host, port, err := net.SplitHostPort(advertise)
-		if err == nil {
-			p, err := strconv.Atoi(port)
-			if err == nil {
-				c.AdvertisePort = p
-			}
-			c.AdvertiseAddr = host
-		}
-	}
-
-	// machine hostname
-	hostname, _ := os.Hostname()
-
-	// set the name
-	c.Name = strings.Join([]string{"micro", hostname, uuid.New().String()}, "-")
-
-	// set a secret key if secure
-	if g.options.Secure {
-		k, ok := g.options.Context.Value(secretKey{}).([]byte)
-		if !ok {
-			// use the default secret
-			k = DefaultSecret
-		}
-		c.SecretKey = k
-	}
-
-	// set connect retry
-	if v, ok := g.options.Context.Value(connectRetryKey{}).(bool); ok && v {
-		g.connectRetry = true
-	}
-
-	// set connect timeout
-	if td, ok := g.options.Context.Value(connectTimeoutKey{}).(time.Duration); ok {
-		g.connectTimeout = td
-	}
-
-	// create a queue
-	queue := &memberlist.TransmitLimitedQueue{
-		NumNodes: func() int {
-			return len(curAddrs)
-		},
-		RetransmitMult: 3,
-	}
-
-	// set the delegate
-	c.Delegate = &delegate{
-		updates: g.updates,
-		queue:   queue,
-	}
-
-	if g.connectRetry {
-		c.Events = &eventDelegate{
-			events: g.events,
-		}
-	}
-	// create the memberlist
-	m, err := memberlist.Create(c)
-	if err != nil {
-		return err
-	}
-
-	if len(curAddrs) > 0 {
-		for _, addr := range curAddrs {
-			g.members[addr] = nodeActionUnknown
-		}
-	}
-
-	g.tcpInterval = c.PushPullInterval
-	g.addrs = curAddrs
-	g.queue = queue
-	g.member = m
-	g.interval = c.GossipInterval
-
-	g.Unlock()
-
-	log.Logf("[gossip] Registry Listening on %s", m.LocalNode().Address())
-
-	// try connect
-	return g.connect(curAddrs)
-}
-
-func (*broadcast) UniqueBroadcast() {}
-
-func (b *broadcast) Invalidates(other memberlist.Broadcast) bool {
-	return false
-}
-
-func (b *broadcast) Message() []byte {
-	up, err := proto.Marshal(b.update)
-	if err != nil {
-		return nil
-	}
-	if l := len(up); l > MaxPacketSize {
-		log.Logf("[gossip] broadcast message size %d bigger then MaxPacketSize %d", l, MaxPacketSize)
-	}
-	return up
-}
-
-func (b *broadcast) Finished() {
-	if b.notify != nil {
-		close(b.notify)
-	}
-}
-
-func (d *delegate) NodeMeta(limit int) []byte {
-	return []byte{}
-}
-
-func (d *delegate) NotifyMsg(b []byte) {
-	if len(b) == 0 {
-		return
-	}
-
-	go func() {
-		up := new(pb.Update)
-		if err := proto.Unmarshal(b, up); err != nil {
-			return
-		}
-
-		// only process service action
-		if up.Type != updateTypeService {
-			return
-		}
-
-		var service *registry.Service
-
-		switch up.Metadata["Content-Type"] {
-		case "application/json":
-			if err := json.Unmarshal(up.Data, &service); err != nil {
-				return
-			}
-		// no other content type
-		default:
-			return
-		}
-
-		// send update
-		d.updates <- &update{
-			Update:  up,
-			Service: service,
-		}
-	}()
-}
-
-func (d *delegate) GetBroadcasts(overhead, limit int) [][]byte {
-	return d.queue.GetBroadcasts(overhead, limit)
-}
-
-func (d *delegate) LocalState(join bool) []byte {
-	if !join {
-		return []byte{}
-	}
-
-	syncCh := make(chan *registry.Service, 1)
-	services := map[string][]*registry.Service{}
-
-	d.updates <- &update{
-		Update: &pb.Update{
-			Action: actionTypeSync,
-		},
-		sync: syncCh,
-	}
-
-	for srv := range syncCh {
-		services[srv.Name] = append(services[srv.Name], srv)
-	}
-
-	b, _ := json.Marshal(services)
-	return b
-}
-
-func (d *delegate) MergeRemoteState(buf []byte, join bool) {
-	if len(buf) == 0 {
-		return
-	}
-	if !join {
-		return
-	}
-
-	var services map[string][]*registry.Service
-	if err := json.Unmarshal(buf, &services); err != nil {
-		return
-	}
-	for _, service := range services {
-		for _, srv := range service {
-			d.updates <- &update{
-				Update:  &pb.Update{Action: actionTypeCreate},
-				Service: srv,
-				sync:    nil,
-			}
-		}
-	}
-}
-
-func (g *gossipRegistry) connect(addrs []string) error {
-	if len(addrs) == 0 {
-		return nil
-	}
-
-	timeout := make(<-chan time.Time)
-
-	if g.connectTimeout > 0 {
-		timeout = time.After(g.connectTimeout)
-	}
-
-	ticker := time.NewTicker(1 * time.Second)
-	defer ticker.Stop()
-
-	fn := func() (int, error) {
-		return g.member.Join(addrs)
-	}
-
-	// don't wait for first try
-	if _, err := fn(); err == nil {
-		return nil
-	}
-
-	// wait loop
-	for {
-		select {
-		// context closed
-		case <-g.options.Context.Done():
-			return nil
-		// call close, don't wait anymore
-		case <-g.done:
-			return nil
-		//  in case of timeout fail with a timeout error
-		case <-timeout:
-			return fmt.Errorf("[gossip] connect timeout %v", g.addrs)
-		// got a tick, try to connect
-		case <-ticker.C:
-			if _, err := fn(); err == nil {
-				log.Logf("[gossip] connect success for %v", g.addrs)
-				return nil
-			} else {
-				log.Logf("[gossip] connect failed for %v", g.addrs)
-			}
-		}
-	}
-
-	return nil
-}
-
-func (g *gossipRegistry) publish(action string, services []*registry.Service) {
-	g.RLock()
-	for _, sub := range g.watchers {
-		go func(sub chan *registry.Result) {
-			for _, service := range services {
-				sub <- &registry.Result{Action: action, Service: service}
-			}
-		}(sub)
-	}
-	g.RUnlock()
-}
-
-func (g *gossipRegistry) subscribe() (chan *registry.Result, chan bool) {
-	next := make(chan *registry.Result, 10)
-	exit := make(chan bool)
-
-	id := uuid.New().String()
-
-	g.Lock()
-	g.watchers[id] = next
-	g.Unlock()
-
-	go func() {
-		<-exit
-		g.Lock()
-		delete(g.watchers, id)
-		close(next)
-		g.Unlock()
-	}()
-
-	return next, exit
-}
-
-func (g *gossipRegistry) Stop() error {
-	select {
-	case <-g.done:
-		return nil
-	default:
-		close(g.done)
-		g.Lock()
-		if g.member != nil {
-			g.member.Leave(g.interval * 2)
-			g.member.Shutdown()
-			g.member = nil
-		}
-		g.Unlock()
-	}
-	return nil
-}
-
-// connectLoop attempts to reconnect to the memberlist
-func (g *gossipRegistry) connectLoop() {
-	// try every second
-	ticker := time.NewTicker(1 * time.Second)
-	defer ticker.Stop()
-
-	for {
-		select {
-		case <-g.done:
-			return
-		case <-g.options.Context.Done():
-			g.Stop()
-			return
-		case <-ticker.C:
-			var addrs []string
-
-			g.RLock()
-
-			// only process if we have a memberlist
-			if g.member == nil {
-				g.RUnlock()
-				continue
-			}
-
-			// self
-			local := g.member.LocalNode().Address()
-
-			// operate on each member
-			for node, action := range g.members {
-				switch action {
-				// process leave event
-				case nodeActionLeave:
-					// don't process self
-					if node == local {
-						continue
-					}
-					addrs = append(addrs, node)
-				}
-			}
-
-			g.RUnlock()
-
-			// connect to all the members
-			// TODO: only connect to new members
-			if len(addrs) > 0 {
-				g.connect(addrs)
-			}
-		}
-	}
-}
-
-func (g *gossipRegistry) expiryLoop(updates *updates) {
-	ticker := time.NewTicker(ExpiryTick)
-	defer ticker.Stop()
-
-	g.RLock()
-	done := g.done
-	g.RUnlock()
-
-	for {
-		select {
-		case <-done:
-			return
-		case <-ticker.C:
-			now := uint64(time.Now().UnixNano())
-
-			updates.Lock()
-
-			// process all the updates
-			for k, v := range updates.services {
-				// check if expiry time has passed
-				if d := (v.Update.Expires); d < now {
-					// delete from records
-					delete(updates.services, k)
-					// set to delete
-					v.Update.Action = actionTypeDelete
-					// fire a new update
-					g.updates <- v
-				}
-			}
-
-			updates.Unlock()
-		}
-	}
-}
-
-// process member events
-func (g *gossipRegistry) eventLoop() {
-	g.RLock()
-	done := g.done
-	g.RUnlock()
-	for {
-		select {
-		// return when done
-		case <-done:
-			return
-		case ev := <-g.events:
-			// TODO: nonblocking update
-			g.Lock()
-			if _, ok := g.members[ev.node]; ok {
-				g.members[ev.node] = ev.action
-			}
-			g.Unlock()
-		}
-	}
-}
-
-func (g *gossipRegistry) run() {
-	updates := &updates{
-		services: make(map[uint64]*update),
-	}
-
-	// expiry loop
-	go g.expiryLoop(updates)
-
-	// event loop
-	go g.eventLoop()
-
-	g.RLock()
-	// connect loop
-	if g.connectRetry {
-		go g.connectLoop()
-	}
-	g.RUnlock()
-
-	// process the updates
-	for u := range g.updates {
-		switch u.Update.Action {
-		case actionTypeCreate:
-			g.Lock()
-			if service, ok := g.services[u.Service.Name]; !ok {
-				g.services[u.Service.Name] = []*registry.Service{u.Service}
-
-			} else {
-				g.services[u.Service.Name] = registry.Merge(service, []*registry.Service{u.Service})
-			}
-			g.Unlock()
-
-			// publish update to watchers
-			go g.publish(actionTypeString(actionTypeCreate), []*registry.Service{u.Service})
-
-			// we need to expire the node at some point in the future
-			if u.Update.Expires > 0 {
-				// create a hash of this service
-				if hash, err := hashstructure.Hash(u.Service, nil); err == nil {
-					updates.Lock()
-					updates.services[hash] = u
-					updates.Unlock()
-				}
-			}
-		case actionTypeDelete:
-			g.Lock()
-			if service, ok := g.services[u.Service.Name]; ok {
-				if services := registry.Remove(service, []*registry.Service{u.Service}); len(services) == 0 {
-					delete(g.services, u.Service.Name)
-				} else {
-					g.services[u.Service.Name] = services
-				}
-			}
-			g.Unlock()
-
-			// publish update to watchers
-			go g.publish(actionTypeString(actionTypeDelete), []*registry.Service{u.Service})
-
-			// delete from expiry checks
-			if hash, err := hashstructure.Hash(u.Service, nil); err == nil {
-				updates.Lock()
-				delete(updates.services, hash)
-				updates.Unlock()
-			}
-		case actionTypeSync:
-			// no sync channel provided
-			if u.sync == nil {
-				continue
-			}
-
-			g.RLock()
-
-			// push all services through the sync chan
-			for _, service := range g.services {
-				for _, srv := range service {
-					u.sync <- srv
-				}
-
-				// publish to watchers
-				go g.publish(actionTypeString(actionTypeCreate), service)
-			}
-
-			g.RUnlock()
-
-			// close the sync chan
-			close(u.sync)
-		}
-	}
-}
-
-func (g *gossipRegistry) Init(opts ...registry.Option) error {
-	return configure(g, opts...)
-}
-
-func (g *gossipRegistry) Options() registry.Options {
-	return g.options
-}
-
-func (g *gossipRegistry) Register(s *registry.Service, opts ...registry.RegisterOption) error {
-	b, err := json.Marshal(s)
-	if err != nil {
-		return err
-	}
-
-	g.Lock()
-	if service, ok := g.services[s.Name]; !ok {
-		g.services[s.Name] = []*registry.Service{s}
-	} else {
-		g.services[s.Name] = registry.Merge(service, []*registry.Service{s})
-	}
-	g.Unlock()
-
-	var options registry.RegisterOptions
-	for _, o := range opts {
-		o(&options)
-	}
-
-	if options.TTL == 0 && g.tcpInterval == 0 {
-		return fmt.Errorf("Require register TTL or interval for memberlist.Config")
-	}
-
-	up := &pb.Update{
-		Expires: uint64(time.Now().Add(options.TTL).UnixNano()),
-		Action:  actionTypeCreate,
-		Type:    updateTypeService,
-		Metadata: map[string]string{
-			"Content-Type": "application/json",
-		},
-		Data: b,
-	}
-
-	g.queue.QueueBroadcast(&broadcast{
-		update: up,
-		notify: nil,
-	})
-
-	// send update to local watchers
-	g.updates <- &update{
-		Update:  up,
-		Service: s,
-	}
-
-	// wait
-	<-time.After(g.interval * 2)
-
-	return nil
-}
-
-func (g *gossipRegistry) Deregister(s *registry.Service) error {
-	b, err := json.Marshal(s)
-	if err != nil {
-		return err
-	}
-
-	g.Lock()
-	if service, ok := g.services[s.Name]; ok {
-		if services := registry.Remove(service, []*registry.Service{s}); len(services) == 0 {
-			delete(g.services, s.Name)
-		} else {
-			g.services[s.Name] = services
-		}
-	}
-	g.Unlock()
-
-	up := &pb.Update{
-		Action: actionTypeDelete,
-		Type:   updateTypeService,
-		Metadata: map[string]string{
-			"Content-Type": "application/json",
-		},
-		Data: b,
-	}
-
-	g.queue.QueueBroadcast(&broadcast{
-		update: up,
-		notify: nil,
-	})
-
-	// send update to local watchers
-	g.updates <- &update{
-		Update:  up,
-		Service: s,
-	}
-
-	// wait
-	<-time.After(g.interval * 2)
-
-	return nil
-}
-
-func (g *gossipRegistry) GetService(name string) ([]*registry.Service, error) {
-	g.RLock()
-	service, ok := g.services[name]
-	g.RUnlock()
-	if !ok {
-		return nil, registry.ErrNotFound
-	}
-	return service, nil
-}
-
-func (g *gossipRegistry) ListServices() ([]*registry.Service, error) {
-	var services []*registry.Service
-	g.RLock()
-	for _, service := range g.services {
-		services = append(services, service...)
-	}
-	g.RUnlock()
-	return services, nil
-}
-
-func (g *gossipRegistry) Watch(opts ...registry.WatchOption) (registry.Watcher, error) {
-	n, e := g.subscribe()
-	return newGossipWatcher(n, e, opts...)
-}
-
-func (g *gossipRegistry) String() string {
-	return "gossip"
-}
-
-func NewRegistry(opts ...registry.Option) registry.Registry {
-	g := &gossipRegistry{
-		options: registry.Options{
-			Context: context.Background(),
-		},
-		done:     make(chan bool),
-		events:   make(chan *event, 100),
-		updates:  make(chan *update, 100),
-		services: make(map[string][]*registry.Service),
-		watchers: make(map[string]chan *registry.Result),
-		members:  make(map[string]int32),
-	}
-	// run the updater
-	go g.run()
-
-	// configure the gossiper
-	if err := configure(g, opts...); err != nil {
-		log.Fatalf("[gossip] Error configuring registry: %v", err)
-	}
-	// wait for setup
-	<-time.After(g.interval * 2)
-
-	return g
-}

registry/gossip/gossip_test.go

@@ -1,214 +0,0 @@
-package gossip
-
-import (
-	"os"
-	"sync"
-	"testing"
-	"time"
-
-	"github.com/google/uuid"
-	"github.com/hashicorp/memberlist"
-	"github.com/micro/go-micro/registry"
-)
-
-func newMemberlistConfig() *memberlist.Config {
-	mc := memberlist.DefaultLANConfig()
-	mc.DisableTcpPings = false
-	mc.GossipVerifyIncoming = false
-	mc.GossipVerifyOutgoing = false
-	mc.EnableCompression = false
-	mc.PushPullInterval = 3 * time.Second
-	mc.LogOutput = os.Stderr
-	mc.ProtocolVersion = 4
-	mc.Name = uuid.New().String()
-	return mc
-}
-
-func newRegistry(opts ...registry.Option) registry.Registry {
-	options := []registry.Option{
-		ConnectRetry(true),
-		ConnectTimeout(60 * time.Second),
-	}
-
-	options = append(options, opts...)
-	r := NewRegistry(options...)
-	return r
-}
-
-func TestGossipRegistryBroadcast(t *testing.T) {
-	mc1 := newMemberlistConfig()
-	r1 := newRegistry(Config(mc1), Address("127.0.0.1:54321"))
-
-	mc2 := newMemberlistConfig()
-	r2 := newRegistry(Config(mc2), Address("127.0.0.2:54321"), registry.Addrs("127.0.0.1:54321"))
-
-	defer r1.(*gossipRegistry).Stop()
-	defer r2.(*gossipRegistry).Stop()
-
-	svc1 := &registry.Service{Name: "service.1", Version: "0.0.0.1"}
-	svc2 := &registry.Service{Name: "service.2", Version: "0.0.0.2"}
-
-	if err := r1.Register(svc1, registry.RegisterTTL(10*time.Second)); err != nil {
-		t.Fatal(err)
-	}
-	if err := r2.Register(svc2, registry.RegisterTTL(10*time.Second)); err != nil {
-		t.Fatal(err)
-	}
-
-	var found bool
-	svcs, err := r1.ListServices()
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	for _, svc := range svcs {
-		if svc.Name == "service.2" {
-			found = true
-		}
-	}
-	if !found {
-		t.Fatalf("[gossip registry] service.2 not found in r1, broadcast not work")
-	}
-
-	found = false
-
-	svcs, err = r2.ListServices()
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	for _, svc := range svcs {
-		if svc.Name == "service.1" {
-			found = true
-		}
-	}
-
-	if !found {
-		t.Fatalf("[gossip registry] broadcast failed: service.1 not found in r2")
-	}
-
-	if err := r1.Deregister(svc1); err != nil {
-		t.Fatal(err)
-	}
-	if err := r2.Deregister(svc2); err != nil {
-		t.Fatal(err)
-	}
-
-}
-func TestGossipRegistryRetry(t *testing.T) {
-	mc1 := newMemberlistConfig()
-	r1 := newRegistry(Config(mc1), Address("127.0.0.1:54321"))
-
-	mc2 := newMemberlistConfig()
-	r2 := newRegistry(Config(mc2), Address("127.0.0.2:54321"), registry.Addrs("127.0.0.1:54321"))
-
-	defer r1.(*gossipRegistry).Stop()
-	defer r2.(*gossipRegistry).Stop()
-
-	svc1 := &registry.Service{Name: "service.1", Version: "0.0.0.1"}
-	svc2 := &registry.Service{Name: "service.2", Version: "0.0.0.2"}
-
-	var mu sync.Mutex
-	ch := make(chan struct{})
-	ticker := time.NewTicker(1 * time.Second)
-	defer ticker.Stop()
-
-	go func() {
-		for {
-			select {
-			case <-ticker.C:
-				mu.Lock()
-				if r1 != nil {
-					r1.Register(svc1, registry.RegisterTTL(2*time.Second))
-				}
-				if r2 != nil {
-					r2.Register(svc2, registry.RegisterTTL(2*time.Second))
-				}
-				if ch != nil {
-					close(ch)
-					ch = nil
-				}
-				mu.Unlock()
-			}
-		}
-	}()
-
-	<-ch
-	var found bool
-
-	svcs, err := r2.ListServices()
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	for _, svc := range svcs {
-		if svc.Name == "service.1" {
-			found = true
-		}
-	}
-
-	if !found {
-		t.Fatalf("[gossip registry] broadcast failed: service.1 not found in r2")
-	}
-
-	if err = r1.(*gossipRegistry).Stop(); err != nil {
-		t.Fatalf("[gossip registry] failed to stop registry: %v", err)
-	}
-
-	mu.Lock()
-	r1 = nil
-	mu.Unlock()
-
-	<-time.After(3 * time.Second)
-
-	found = false
-	svcs, err = r2.ListServices()
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	for _, svc := range svcs {
-		if svc.Name == "service.1" {
-			found = true
-		}
-	}
-
-	if found {
-		t.Fatalf("[gossip registry] service.1 found in r2")
-	}
-
-	if tr := os.Getenv("TRAVIS"); len(tr) > 0 {
-		t.Logf("[gossip registry] skip test on travis")
-		t.Skip()
-		return
-	}
-
-	r1 = newRegistry(Config(mc1), Address("127.0.0.1:54321"))
-	<-time.After(2 * time.Second)
-
-	found = false
-	svcs, err = r2.ListServices()
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	for _, svc := range svcs {
-		if svc.Name == "service.1" {
-			found = true
-		}
-	}
-
-	if !found {
-		t.Fatalf("[gossip registry] connect retry failed: service.1 not found in r2")
-	}
-
-	if err := r1.Deregister(svc1); err != nil {
-		t.Fatal(err)
-	}
-	if err := r2.Deregister(svc2); err != nil {
-		t.Fatal(err)
-	}
-
-	r1.(*gossipRegistry).Stop()
-	r2.(*gossipRegistry).Stop()
-}

registry/gossip/options.go

@@ -1,58 +0,0 @@
-package gossip
-
-import (
-	"context"
-	"time"
-
-	"github.com/hashicorp/memberlist"
-	"github.com/micro/go-micro/registry"
-)
-
-type secretKey struct{}
-type addressKey struct{}
-type configKey struct{}
-type advertiseKey struct{}
-type connectTimeoutKey struct{}
-type connectRetryKey struct{}
-
-// helper for setting registry options
-func setRegistryOption(k, v interface{}) registry.Option {
-	return func(o *registry.Options) {
-		if o.Context == nil {
-			o.Context = context.Background()
-		}
-		o.Context = context.WithValue(o.Context, k, v)
-	}
-}
-
-// Secret specifies an encryption key. The value should be either
-// 16, 24, or 32 bytes to select AES-128, AES-192, or AES-256.
-func Secret(k []byte) registry.Option {
-	return setRegistryOption(secretKey{}, k)
-}
-
-// Address to bind to - host:port
-func Address(a string) registry.Option {
-	return setRegistryOption(addressKey{}, a)
-}
-
-// Config sets *memberlist.Config for configuring gossip
-func Config(c *memberlist.Config) registry.Option {
-	return setRegistryOption(configKey{}, c)
-}
-
-// The address to advertise for other gossip members to connect to - host:port
-func Advertise(a string) registry.Option {
-	return setRegistryOption(advertiseKey{}, a)
-}
-
-// ConnectTimeout sets the registry connect timeout. Use -1 to specify infinite timeout
-func ConnectTimeout(td time.Duration) registry.Option {
-	return setRegistryOption(connectTimeoutKey{}, td)
-}
-
-// ConnectRetry enables reconnect to registry then connection closed,
-// use with ConnectTimeout to specify how long retry
-func ConnectRetry(v bool) registry.Option {
-	return setRegistryOption(connectRetryKey{}, v)
-}

registry/gossip/proto/gossip.micro.go

@@ -1,28 +0,0 @@
-// Code generated by protoc-gen-micro. DO NOT EDIT.
-// source: github.com/micro/go-micro/registry/gossip/proto/gossip.proto
-
-/*
-Package gossip is a generated protocol buffer package.
-
-It is generated from these files:
-	github.com/micro/go-micro/registry/gossip/proto/gossip.proto
-
-It has these top-level messages:
-	Update
-*/
-package gossip
-
-import proto "github.com/golang/protobuf/proto"
-import fmt "fmt"
-import 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.ProtoPackageIsVersion2 // please upgrade the proto package

registry/gossip/proto/gossip.pb.go

@@ -1,127 +0,0 @@
-// Code generated by protoc-gen-go. DO NOT EDIT.
-// source: github.com/micro/go-micro/registry/gossip/proto/gossip.proto
-
-package gossip
-
-import (
-	fmt "fmt"
-	math "math"
-
-	proto "github.com/golang/protobuf/proto"
-)
-
-// 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.ProtoPackageIsVersion2 // please upgrade the proto package
-
-// Update is the message broadcast
-type Update struct {
-	// time to live for entry
-	Expires uint64 `protobuf:"varint,1,opt,name=expires,proto3" json:"expires,omitempty"`
-	// type of update
-	Type int32 `protobuf:"varint,2,opt,name=type,proto3" json:"type,omitempty"`
-	// what action is taken
-	Action int32 `protobuf:"varint,3,opt,name=action,proto3" json:"action,omitempty"`
-	// any other associated metadata about the data
-	Metadata map[string]string `protobuf:"bytes,6,rep,name=metadata,proto3" json:"metadata,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
-	// the payload data;
-	Data                 []byte   `protobuf:"bytes,7,opt,name=data,proto3" json:"data,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
-}
-
-func (m *Update) Reset()         { *m = Update{} }
-func (m *Update) String() string { return proto.CompactTextString(m) }
-func (*Update) ProtoMessage()    {}
-func (*Update) Descriptor() ([]byte, []int) {
-	return fileDescriptor_18cba623e76e57f3, []int{0}
-}
-
-func (m *Update) XXX_Unmarshal(b []byte) error {
-	return xxx_messageInfo_Update.Unmarshal(m, b)
-}
-func (m *Update) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
-	return xxx_messageInfo_Update.Marshal(b, m, deterministic)
-}
-func (m *Update) XXX_Merge(src proto.Message) {
-	xxx_messageInfo_Update.Merge(m, src)
-}
-func (m *Update) XXX_Size() int {
-	return xxx_messageInfo_Update.Size(m)
-}
-func (m *Update) XXX_DiscardUnknown() {
-	xxx_messageInfo_Update.DiscardUnknown(m)
-}
-
-var xxx_messageInfo_Update proto.InternalMessageInfo
-
-func (m *Update) GetExpires() uint64 {
-	if m != nil {
-		return m.Expires
-	}
-	return 0
-}
-
-func (m *Update) GetType() int32 {
-	if m != nil {
-		return m.Type
-	}
-	return 0
-}
-
-func (m *Update) GetAction() int32 {
-	if m != nil {
-		return m.Action
-	}
-	return 0
-}
-
-func (m *Update) GetMetadata() map[string]string {
-	if m != nil {
-		return m.Metadata
-	}
-	return nil
-}
-
-func (m *Update) GetData() []byte {
-	if m != nil {
-		return m.Data
-	}
-	return nil
-}
-
-func init() {
-	proto.RegisterType((*Update)(nil), "gossip.Update")
-	proto.RegisterMapType((map[string]string)(nil), "gossip.Update.MetadataEntry")
-}
-
-func init() {
-	proto.RegisterFile("github.com/micro/go-micro/registry/gossip/proto/gossip.proto", fileDescriptor_18cba623e76e57f3)
-}
-
-var fileDescriptor_18cba623e76e57f3 = []byte{
-	// 227 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x54, 0x8f, 0xc1, 0x4a, 0x03, 0x31,
-	0x14, 0x45, 0x49, 0xa7, 0x4d, 0xed, 0x53, 0x41, 0x1e, 0x22, 0x41, 0x5c, 0x0c, 0xae, 0x66, 0xe3,
-	0x0c, 0xe8, 0xa6, 0xa8, 0x5b, 0x97, 0x6e, 0x02, 0x7e, 0x40, 0x3a, 0x0d, 0x31, 0xe8, 0x34, 0x21,
-	0x79, 0x15, 0xf3, 0xa9, 0xfe, 0x8d, 0x34, 0x89, 0x42, 0x77, 0xe7, 0x24, 0x37, 0xdc, 0x1b, 0x78,
-	0x36, 0x96, 0xde, 0xf7, 0x9b, 0x7e, 0x74, 0xd3, 0x30, 0xd9, 0x31, 0xb8, 0xc1, 0xb8, 0xbb, 0x02,
-	0x41, 0x1b, 0x1b, 0x29, 0xa4, 0xc1, 0xb8, 0x18, 0xad, 0x1f, 0x7c, 0x70, 0xe4, 0xaa, 0xf4, 0x59,
-	0x90, 0x17, 0xbb, 0xfd, 0x61, 0xc0, 0xdf, 0xfc, 0x56, 0x91, 0x46, 0x01, 0x4b, 0xfd, 0xed, 0x6d,
-	0xd0, 0x51, 0xb0, 0x96, 0x75, 0x73, 0xf9, 0xa7, 0x88, 0x30, 0xa7, 0xe4, 0xb5, 0x98, 0xb5, 0xac,
-	0x5b, 0xc8, 0xcc, 0x78, 0x05, 0x5c, 0x8d, 0x64, 0xdd, 0x4e, 0x34, 0xf9, 0xb4, 0x1a, 0xae, 0xe1,
-	0x64, 0xd2, 0xa4, 0xb6, 0x8a, 0x94, 0xe0, 0x6d, 0xd3, 0x9d, 0xde, 0xdf, 0xf4, 0xb5, 0xb9, 0xf4,
-	0xf4, 0xaf, 0xf5, 0xfa, 0x65, 0x47, 0x21, 0xc9, 0xff, 0xf4, 0xa1, 0x25, 0xbf, 0x5a, 0xb6, 0xac,
-	0x3b, 0x93, 0x99, 0xaf, 0x9f, 0xe0, 0xfc, 0x28, 0x8e, 0x17, 0xd0, 0x7c, 0xe8, 0x94, 0x07, 0xae,
-	0xe4, 0x01, 0xf1, 0x12, 0x16, 0x5f, 0xea, 0x73, 0x5f, 0xd6, 0xad, 0x64, 0x91, 0xc7, 0xd9, 0x9a,
-	0x6d, 0x78, 0xfe, 0xea, 0xc3, 0x6f, 0x00, 0x00, 0x00, 0xff, 0xff, 0xd6, 0x63, 0x7b, 0x1b, 0x2a,
-	0x01, 0x00, 0x00,
-}

registry/gossip/proto/gossip.proto

@@ -1,17 +0,0 @@
-syntax = "proto3";
-
-package gossip;
-
-// Update is the message broadcast
-message Update {
-	// time to live for entry
-	uint64 expires = 1;
-	// type of update
-	int32 type = 2;
-	// what action is taken
-	int32 action = 3;
-	// any other associated metadata about the data
-	map<string, string> metadata = 6;
-	// the payload data;
-	bytes data = 7;
-}

registry/gossip/watcher.go

@@ -1,53 +0,0 @@
-package gossip
-
-import (
-	"github.com/micro/go-micro/registry"
-)
-
-type gossipWatcher struct {
-	wo   registry.WatchOptions
-	next chan *registry.Result
-	stop chan bool
-}
-
-func newGossipWatcher(ch chan *registry.Result, stop chan bool, opts ...registry.WatchOption) (registry.Watcher, error) {
-	var wo registry.WatchOptions
-	for _, o := range opts {
-		o(&wo)
-	}
-
-	return &gossipWatcher{
-		wo:   wo,
-		next: ch,
-		stop: stop,
-	}, nil
-}
-
-func (m *gossipWatcher) Next() (*registry.Result, error) {
-	for {
-		select {
-		case r, ok := <-m.next:
-			if !ok {
-				return nil, registry.ErrWatcherStopped
-			}
-			// check watch options
-			if len(m.wo.Service) > 0 && r.Service.Name != m.wo.Service {
-				continue
-			}
-			nr := &registry.Result{}
-			*nr = *r
-			return nr, nil
-		case <-m.stop:
-			return nil, registry.ErrWatcherStopped
-		}
-	}
-}
-
-func (m *gossipWatcher) Stop() {
-	select {
-	case <-m.stop:
-		return
-	default:
-		close(m.stop)
-	}
-}

registry/mdns_registry.go

@@ -10,8 +10,8 @@ import (
 	"sync"
 	"time"
 
+	"github.com/google/uuid"
 	"github.com/micro/mdns"
-	hash "github.com/mitchellh/hashstructure"
 )
 
 var (
@@ -27,7 +27,6 @@ type mdnsTxt struct {
 }
 
 type mdnsEntry struct {
-	hash uint64
 	id   string
 	node *mdns.Server
 }
@@ -39,6 +38,14 @@ type mdnsRegistry struct {
 
 	sync.Mutex
 	services map[string][]*mdnsEntry
+
+	mtx sync.RWMutex
+
+	// watchers
+	watchers map[string]*mdnsWatcher
+
+	// listener
+	listener chan *mdns.ServiceEntry
 }
 
 func newRegistry(opts ...Option) Registry {
@@ -63,6 +70,7 @@ func newRegistry(opts ...Option) Registry {
 		opts:     options,
 		domain:   domain,
 		services: make(map[string][]*mdnsEntry),
+		watchers: make(map[string]*mdnsWatcher),
 	}
 }
 
@@ -109,13 +117,6 @@ func (m *mdnsRegistry) Register(service *Service, opts ...RegisterOption) error
 	var gerr error
 
 	for _, node := range service.Nodes {
-		// create hash of service; uint64
-		h, err := hash.Hash(node, nil)
-		if err != nil {
-			gerr = err
-			continue
-		}
-
 		var seen bool
 		var e *mdnsEntry
 
@@ -128,14 +129,11 @@ func (m *mdnsRegistry) Register(service *Service, opts ...RegisterOption) error
 		}
 
 		// already registered, continue
-		if seen && e.hash == h {
+		if seen {
 			continue
-			// hash doesn't match, shutdown
-		} else if seen {
-			e.node.Shutdown()
 			// doesn't exist
 		} else {
-			e = &mdnsEntry{hash: h}
+			e = &mdnsEntry{}
 		}
 
 		txt, err := encode(&mdnsTxt{
@@ -358,15 +356,88 @@ func (m *mdnsRegistry) Watch(opts ...WatchOption) (Watcher, error) {
 	}
 
 	md := &mdnsWatcher{
-		wo:     wo,
-		ch:     make(chan *mdns.ServiceEntry, 32),
-		exit:   make(chan struct{}),
-		domain: m.domain,
+		id:       uuid.New().String(),
+		wo:       wo,
+		ch:       make(chan *mdns.ServiceEntry, 32),
+		exit:     make(chan struct{}),
+		domain:   m.domain,
+		registry: m,
 	}
 
+	m.mtx.Lock()
+	defer m.mtx.Unlock()
+
+	// save the watcher
+	m.watchers[md.id] = md
+
+	// check of the listener exists
+	if m.listener != nil {
+		return md, nil
+	}
+
+	// start the listener
 	go func() {
-		if err := mdns.Listen(md.ch, md.exit); err != nil {
-			md.Stop()
+		// go to infinity
+		for {
+			m.mtx.Lock()
+
+			// just return if there are no watchers
+			if len(m.watchers) == 0 {
+				m.listener = nil
+				m.mtx.Unlock()
+				return
+			}
+
+			// check existing listener
+			if m.listener != nil {
+				m.mtx.Unlock()
+				return
+			}
+
+			// reset the listener
+			exit := make(chan struct{})
+			ch := make(chan *mdns.ServiceEntry, 32)
+			m.listener = ch
+
+			m.mtx.Unlock()
+
+			// send messages to the watchers
+			go func() {
+				send := func(w *mdnsWatcher, e *mdns.ServiceEntry) {
+					select {
+					case w.ch <- e:
+					default:
+					}
+				}
+
+				for {
+					select {
+					case <-exit:
+						return
+					case e, ok := <-ch:
+						if !ok {
+							return
+						}
+						m.mtx.RLock()
+						// send service entry to all watchers
+						for _, w := range m.watchers {
+							send(w, e)
+						}
+						m.mtx.RUnlock()
+					}
+				}
+
+			}()
+
+			// start listening, blocking call
+			mdns.Listen(ch, exit)
+
+			// mdns.Listen has unblocked
+			// kill the saved listener
+			m.mtx.Lock()
+			m.listener = nil
+			close(ch)
+			m.mtx.Unlock()
 		}
 	}()
 

registry/mdns_test.go

@@ -7,11 +7,11 @@ import (
 
 func TestMDNS(t *testing.T) {
 	testData := []*Service{
-		&Service{
+		{
 			Name:    "test1",
 			Version: "1.0.1",
 			Nodes: []*Node{
-				&Node{
+				{
 					Id:      "test1-1",
 					Address: "10.0.0.1:10001",
 					Metadata: map[string]string{
@@ -20,11 +20,11 @@ func TestMDNS(t *testing.T) {
 				},
 			},
 		},
-		&Service{
+		{
 			Name:    "test2",
 			Version: "1.0.2",
 			Nodes: []*Node{
-				&Node{
+				{
 					Id:      "test2-1",
 					Address: "10.0.0.2:10002",
 					Metadata: map[string]string{
@@ -33,11 +33,11 @@ func TestMDNS(t *testing.T) {
 				},
 			},
 		},
-		&Service{
+		{
 			Name:    "test3",
 			Version: "1.0.3",
 			Nodes: []*Node{
-				&Node{
+				{
 					Id:      "test3-1",
 					Address: "10.0.0.3:10003",
 					Metadata: map[string]string{

registry/mdns_watcher.go

@@ -8,11 +8,14 @@ import (
 )
 
 type mdnsWatcher struct {
+	id   string
 	wo   WatchOptions
 	ch   chan *mdns.ServiceEntry
 	exit chan struct{}
 	// the mdns domain
 	domain string
+	// the registry
+	registry *mdnsRegistry
 }
 
 func (m *mdnsWatcher) Next() (*Result, error) {
@@ -76,5 +79,9 @@ func (m *mdnsWatcher) Stop() {
 		return
 	default:
 		close(m.exit)
+		// remove self from the registry
+		m.registry.mtx.Lock()
+		delete(m.registry.watchers, m.id)
+		m.registry.mtx.Unlock()
 	}
 }