go mod tidy

Bump dep to fix platform web using new debug.Stats proto fields

README.md

@@ -12,7 +12,7 @@ but everything can be easily swapped out.
 
 Plugins are available at [github.com/micro/go-plugins](https://github.com/micro/go-plugins).
 
-Follow us on [Twitter](https://twitter.com/microhq) or join the [Slack](https://micro.mu/slack) community.
+Follow us on [Twitter](https://twitter.com/microhq) or join the [Community](https://micro.mu/slack).
 
 ## Features
 
@@ -32,11 +32,11 @@ and server handle this by default. This includes protobuf and json by default.
 
 - **Request/Response** - RPC based request/response with support for bidirectional streaming. We provide an abstraction for synchronous 
 communication. A request made to a service will be automatically resolved, load balanced, dialled and streamed. The default 
-transport is http/1.1 or http2 when tls is enabled.
+transport is [gRPC](https://grpc.io/).
 
 - **Async Messaging** - PubSub is built in as a first class citizen for asynchronous communication and event driven architectures. 
-Event notifications are a core pattern in micro service development. The default messaging is point-to-point http/1.1 or http2 when tls 
-is enabled.
+Event notifications are a core pattern in micro service development. The default messaging system is an embedded [NATS](https://nats.io/) 
+server.
 
 - **Pluggable Interfaces** - Go Micro makes use of Go interfaces for each distributed system abstraction. Because of this these interfaces 
 are pluggable and allows Go Micro to be runtime agnostic. You can plugin any underlying technology. Find plugins in 

agent/input/discord/discord.go

@@ -8,7 +8,7 @@ import (
 	"strings"
 
 	"github.com/bwmarrin/discordgo"
-	"github.com/micro/cli"
+	"github.com/micro/cli/v2"
 	"github.com/micro/go-micro/agent/input"
 )
 
@@ -36,21 +36,21 @@ type discordInput struct {
 
 func (d *discordInput) Flags() []cli.Flag {
 	return []cli.Flag{
-		cli.StringFlag{
-			Name:   "discord_token",
-			EnvVar: "MICRO_DISCORD_TOKEN",
-			Usage:  "Discord token (prefix with Bot if it's for bot account)",
+		&cli.StringFlag{
+			Name:    "discord_token",
+			EnvVars: []string{"MICRO_DISCORD_TOKEN"},
+			Usage:   "Discord token (prefix with Bot if it's for bot account)",
 		},
-		cli.StringFlag{
-			Name:   "discord_whitelist",
-			EnvVar: "MICRO_DISCORD_WHITELIST",
-			Usage:  "Discord Whitelist (seperated by ,)",
+		&cli.StringFlag{
+			Name:    "discord_whitelist",
+			EnvVars: []string{"MICRO_DISCORD_WHITELIST"},
+			Usage:   "Discord Whitelist (seperated by ,)",
 		},
-		cli.StringFlag{
-			Name:   "discord_prefix",
-			Usage:  "Discord Prefix",
-			EnvVar: "MICRO_DISCORD_PREFIX",
-			Value:  "Micro ",
+		&cli.StringFlag{
+			Name:    "discord_prefix",
+			Usage:   "Discord Prefix",
+			EnvVars: []string{"MICRO_DISCORD_PREFIX"},
+			Value:   "Micro ",
 		},
 	}
 }

agent/input/input.go

@@ -2,7 +2,7 @@
 package input
 
 import (
-	"github.com/micro/cli"
+	"github.com/micro/cli/v2"
 )
 
 type EventType string

agent/input/slack/slack.go

@@ -4,7 +4,7 @@ import (
 	"errors"
 	"sync"
 
-	"github.com/micro/cli"
+	"github.com/micro/cli/v2"
 	"github.com/micro/go-micro/agent/input"
 	"github.com/nlopes/slack"
 )
@@ -26,15 +26,15 @@ func init() {
 
 func (p *slackInput) Flags() []cli.Flag {
 	return []cli.Flag{
-		cli.BoolFlag{
-			Name:   "slack_debug",
-			Usage:  "Slack debug output",
-			EnvVar: "MICRO_SLACK_DEBUG",
+		&cli.BoolFlag{
+			Name:    "slack_debug",
+			Usage:   "Slack debug output",
+			EnvVars: []string{"MICRO_SLACK_DEBUG"},
 		},
-		cli.StringFlag{
-			Name:   "slack_token",
-			Usage:  "Slack token",
-			EnvVar: "MICRO_SLACK_TOKEN",
+		&cli.StringFlag{
+			Name:    "slack_token",
+			Usage:   "Slack token",
+			EnvVars: []string{"MICRO_SLACK_TOKEN"},
 		},
 	}
 }

agent/input/telegram/telegram.go

@@ -5,7 +5,7 @@ import (
 	"strings"
 	"sync"
 
-	"github.com/micro/cli"
+	"github.com/micro/cli/v2"
 	"github.com/micro/go-micro/agent/input"
 	tgbotapi "gopkg.in/telegram-bot-api.v4"
 )
@@ -34,20 +34,20 @@ func init() {
 
 func (ti *telegramInput) Flags() []cli.Flag {
 	return []cli.Flag{
-		cli.BoolFlag{
-			Name:   "telegram_debug",
-			EnvVar: "MICRO_TELEGRAM_DEBUG",
-			Usage:  "Telegram debug output",
+		&cli.BoolFlag{
+			Name:    "telegram_debug",
+			EnvVars: []string{"MICRO_TELEGRAM_DEBUG"},
+			Usage:   "Telegram debug output",
 		},
-		cli.StringFlag{
-			Name:   "telegram_token",
-			EnvVar: "MICRO_TELEGRAM_TOKEN",
-			Usage:  "Telegram token",
+		&cli.StringFlag{
+			Name:    "telegram_token",
+			EnvVars: []string{"MICRO_TELEGRAM_TOKEN"},
+			Usage:   "Telegram token",
 		},
-		cli.StringFlag{
-			Name:   "telegram_whitelist",
-			EnvVar: "MICRO_TELEGRAM_WHITELIST",
-			Usage:  "Telegram bot's users (comma-separated values)",
+		&cli.StringFlag{
+			Name:    "telegram_whitelist",
+			EnvVars: []string{"MICRO_TELEGRAM_WHITELIST"},
+			Usage:   "Telegram bot's users (comma-separated values)",
 		},
 	}
 }

api/api.go

@@ -57,14 +57,25 @@ func Encode(e *Endpoint) map[string]string {
 		return nil
 	}
 
-	return map[string]string{
-		"endpoint":    e.Name,
-		"description": e.Description,
-		"method":      strings.Join(e.Method, ","),
-		"path":        strings.Join(e.Path, ","),
-		"host":        strings.Join(e.Host, ","),
-		"handler":     e.Handler,
+	// endpoint map
+	ep := make(map[string]string)
+
+	// set vals only if they exist
+	set := func(k, v string) {
+		if len(v) == 0 {
+			return
+		}
+		ep[k] = v
 	}
+
+	set("endpoint", e.Name)
+	set("description", e.Description)
+	set("handler", e.Handler)
+	set("method", strings.Join(e.Method, ","))
+	set("path", strings.Join(e.Path, ","))
+	set("host", strings.Join(e.Host, ","))
+
+	return ep
 }
 
 // Decode decodes endpoint metadata into an endpoint

api/handler/http/http_test.go

@@ -9,14 +9,12 @@ import (
 	"github.com/micro/go-micro/api/handler"
 	"github.com/micro/go-micro/api/router"
 	regRouter "github.com/micro/go-micro/api/router/registry"
-	"github.com/micro/go-micro/config/cmd"
 	"github.com/micro/go-micro/registry"
 	"github.com/micro/go-micro/registry/memory"
 )
 
 func testHttp(t *testing.T, path, service, ns string) {
 	r := memory.NewRegistry()
-	cmd.DefaultCmd = cmd.NewCmd(cmd.Registry(&r))
 
 	l, err := net.Listen("tcp", "127.0.0.1:0")
 	if err != nil {
@@ -57,6 +55,7 @@ func testHttp(t *testing.T, path, service, ns string) {
 	rt := regRouter.NewRouter(
 		router.WithHandler("http"),
 		router.WithNamespace(ns),
+		router.WithRegistry(r),
 	)
 
 	p := NewHandler(handler.WithRouter(rt))

api/router/options.go

@@ -3,7 +3,6 @@ package router
 import (
 	"github.com/micro/go-micro/api/resolver"
 	"github.com/micro/go-micro/api/resolver/micro"
-	"github.com/micro/go-micro/config/cmd"
 	"github.com/micro/go-micro/registry"
 )
 
@@ -19,7 +18,7 @@ type Option func(o *Options)
 func NewOptions(opts ...Option) Options {
 	options := Options{
 		Handler:  "meta",
-		Registry: *cmd.DefaultOptions().Registry,
+		Registry: registry.DefaultRegistry,
 	}
 
 	for _, o := range opts {

auth/auth.go

@@ -0,0 +1,40 @@
+// Package auth provides authentication and authorization capability
+package auth
+
+import (
+	"time"
+)
+
+// Auth providers authentication and authorization
+type Auth interface {
+	// Generate a new auth token
+	Generate(string) (*Token, error)
+	// Revoke an authorization token
+	Revoke(*Token) error
+	// Grant access to a resource
+	Grant(*Token, *Service) error
+	// Verify a token can access a resource
+	Verify(*Token, *Service) error
+}
+
+// Service is some thing to provide access to
+type Service struct {
+	// Name of the resource
+	Name string
+	// Endpoint is the specific endpoint
+	Endpoint string
+}
+
+// Token providers by an auth provider
+type Token struct {
+	// Unique token id
+	Id string `json: "id"`
+	// Time of token creation
+	Created time.Time `json:"created"`
+	// Time of token expiry
+	Expiry time.Time `json:"expiry"`
+	// Roles associated with the token
+	Roles []string `json:"roles"`
+	// Any other associated metadata
+	Metadata map[string]string `json:"metadata"`
+}

broker/broker.go

@@ -38,13 +38,9 @@ type Subscriber interface {
 }
 
 var (
-	DefaultBroker Broker = newHttpBroker()
+	DefaultBroker Broker = NewBroker()
 )
 
-func NewBroker(opts ...Option) Broker {
-	return newHttpBroker(opts...)
-}
-
 func Init(opts ...Option) error {
 	return DefaultBroker.Init(opts...)
 }

broker/common_test.go

@@ -1,47 +0,0 @@
-package broker
-
-import (
-	"github.com/micro/go-micro/registry"
-)
-
-var (
-	// mock data
-	testData = map[string][]*registry.Service{
-		"foo": {
-			{
-				Name:    "foo",
-				Version: "1.0.0",
-				Nodes: []*registry.Node{
-					{
-						Id:      "foo-1.0.0-123",
-						Address: "localhost:9999",
-					},
-					{
-						Id:      "foo-1.0.0-321",
-						Address: "localhost:9999",
-					},
-				},
-			},
-			{
-				Name:    "foo",
-				Version: "1.0.1",
-				Nodes: []*registry.Node{
-					{
-						Id:      "foo-1.0.1-321",
-						Address: "localhost:6666",
-					},
-				},
-			},
-			{
-				Name:    "foo",
-				Version: "1.0.3",
-				Nodes: []*registry.Node{
-					{
-						Id:      "foo-1.0.3-345",
-						Address: "localhost:8888",
-					},
-				},
-			},
-		},
-	}
-)

broker/default.go

@@ -0,0 +1,459 @@
+package broker
+
+import (
+	"context"
+	"errors"
+	"net"
+	"net/url"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/micro/go-micro/codec/json"
+	"github.com/micro/go-micro/registry"
+	"github.com/micro/go-micro/util/addr"
+	"github.com/micro/go-micro/util/log"
+	"github.com/nats-io/nats-server/v2/server"
+	nats "github.com/nats-io/nats.go"
+)
+
+type natsBroker struct {
+	sync.Once
+	sync.RWMutex
+
+	// indicate if we're connected
+	connected bool
+
+	// address to bind routes to
+	addrs []string
+	// servers for the client
+	servers []string
+
+	// client connection and nats opts
+	conn  *nats.Conn
+	opts  Options
+	nopts nats.Options
+
+	// should we drain the connection
+	drain   bool
+	closeCh chan (error)
+
+	// embedded server
+	server *server.Server
+	// configure to use local server
+	local bool
+	// server exit channel
+	exit chan bool
+}
+
+type subscriber struct {
+	s    *nats.Subscription
+	opts SubscribeOptions
+}
+
+type publication struct {
+	t string
+	m *Message
+}
+
+func (p *publication) Topic() string {
+	return p.t
+}
+
+func (p *publication) Message() *Message {
+	return p.m
+}
+
+func (p *publication) Ack() error {
+	// nats does not support acking
+	return nil
+}
+
+func (s *subscriber) Options() SubscribeOptions {
+	return s.opts
+}
+
+func (s *subscriber) Topic() string {
+	return s.s.Subject
+}
+
+func (s *subscriber) Unsubscribe() error {
+	return s.s.Unsubscribe()
+}
+
+func (n *natsBroker) Address() string {
+	n.RLock()
+	defer n.RUnlock()
+
+	if n.server != nil {
+		return n.server.ClusterAddr().String()
+	}
+
+	if n.conn != nil && n.conn.IsConnected() {
+		return n.conn.ConnectedUrl()
+	}
+
+	if len(n.addrs) > 0 {
+		return n.addrs[0]
+	}
+
+	return "127.0.0.1:-1"
+}
+
+func (n *natsBroker) setAddrs(addrs []string) []string {
+	//nolint:prealloc
+	var cAddrs []string
+	for _, addr := range addrs {
+		if len(addr) == 0 {
+			continue
+		}
+		if !strings.HasPrefix(addr, "nats://") {
+			addr = "nats://" + addr
+		}
+		cAddrs = append(cAddrs, addr)
+	}
+	// if there's no address and we weren't told to
+	// embed a local server then use the default url
+	if len(cAddrs) == 0 && !n.local {
+		cAddrs = []string{nats.DefaultURL}
+	}
+	return cAddrs
+}
+
+// serve stats a local nats server if needed
+func (n *natsBroker) serve(exit chan bool) error {
+	// local server address
+	host := "127.0.0.1"
+	port := -1
+
+	// cluster address
+	caddr := "0.0.0.0"
+	cport := -1
+
+	// with no address we just default it
+	// this is a local client address
+	if len(n.addrs) > 0 {
+		address := n.addrs[0]
+		if strings.HasPrefix(address, "nats://") {
+			address = strings.TrimPrefix(address, "nats://")
+		}
+
+		// parse out the address
+		h, p, err := net.SplitHostPort(address)
+		if err == nil {
+			caddr = h
+			cport, _ = strconv.Atoi(p)
+		}
+	}
+
+	// 1. create new server
+	// 2. register the server
+	// 3. connect to other servers
+
+	// set cluster opts
+	cOpts := server.ClusterOpts{
+		Host: caddr,
+		Port: cport,
+	}
+
+	// get the routes for other nodes
+	var routes []*url.URL
+
+	// get existing nats servers to connect to
+	services, err := n.opts.Registry.GetService("go.micro.nats.broker")
+	if err == nil {
+		for _, service := range services {
+			for _, node := range service.Nodes {
+				u, err := url.Parse("nats://" + node.Address)
+				if err != nil {
+					log.Log(err)
+					continue
+				}
+				// append to the cluster routes
+				routes = append(routes, u)
+			}
+		}
+	}
+
+	// try get existing server
+	s := n.server
+
+	if s != nil {
+		// stop the existing server
+		s.Shutdown()
+	}
+
+	s, err = server.NewServer(&server.Options{
+		// Specify the host
+		Host: host,
+		// Use a random port
+		Port: port,
+		// Set the cluster ops
+		Cluster: cOpts,
+		// Set the routes
+		Routes:         routes,
+		NoLog:          true,
+		NoSigs:         true,
+		MaxControlLine: 2048,
+		TLSConfig:      n.opts.TLSConfig,
+	})
+	if err != nil {
+		return err
+	}
+
+	// save the server
+	n.server = s
+
+	// start the server
+	go s.Start()
+
+	var ready bool
+
+	// wait till its ready for connections
+	for i := 0; i < 3; i++ {
+		if s.ReadyForConnections(time.Second) {
+			ready = true
+			break
+		}
+	}
+
+	if !ready {
+		return errors.New("server not ready")
+	}
+
+	// set the client address
+	n.servers = []string{s.ClientURL()}
+
+	go func() {
+		var advertise string
+
+		// parse out the address
+		_, port, err := net.SplitHostPort(s.ClusterAddr().String())
+		if err == nil {
+			addr, _ := addr.Extract("")
+			advertise = net.JoinHostPort(addr, port)
+		} else {
+			s.ClusterAddr().String()
+		}
+
+		// register the cluster address
+		for {
+			select {
+			case <-exit:
+				// deregister on exit
+				n.opts.Registry.Deregister(&registry.Service{
+					Name:    "go.micro.nats.broker",
+					Version: "v2",
+					Nodes: []*registry.Node{
+						{Id: s.ID(), Address: advertise},
+					},
+				})
+				s.Shutdown()
+				return
+			default:
+				// register the broker
+				n.opts.Registry.Register(&registry.Service{
+					Name:    "go.micro.nats.broker",
+					Version: "v2",
+					Nodes: []*registry.Node{
+						{Id: s.ID(), Address: advertise},
+					},
+				}, registry.RegisterTTL(time.Minute))
+				time.Sleep(time.Minute)
+			}
+		}
+	}()
+
+	return nil
+}
+
+func (n *natsBroker) Connect() error {
+	n.Lock()
+	defer n.Unlock()
+
+	if !n.connected {
+		// create exit chan
+		n.exit = make(chan bool)
+
+		// start the local server
+		if err := n.serve(n.exit); err != nil {
+			return err
+		}
+
+		// set to connected
+		n.connected = true
+	}
+
+	status := nats.CLOSED
+	if n.conn != nil {
+		status = n.conn.Status()
+	}
+
+	switch status {
+	case nats.CONNECTED, nats.RECONNECTING, nats.CONNECTING:
+		return nil
+	default: // DISCONNECTED or CLOSED or DRAINING
+		opts := n.nopts
+		opts.Servers = n.servers
+		opts.Secure = n.opts.Secure
+		opts.TLSConfig = n.opts.TLSConfig
+
+		// secure might not be set
+		if n.opts.TLSConfig != nil {
+			opts.Secure = true
+		}
+
+		c, err := opts.Connect()
+		if err != nil {
+			return err
+		}
+		n.conn = c
+		return nil
+	}
+}
+
+func (n *natsBroker) Disconnect() error {
+	n.RLock()
+	defer n.RUnlock()
+
+	if !n.connected {
+		return nil
+	}
+
+	// drain the connection if specified
+	if n.drain {
+		n.conn.Drain()
+		return <-n.closeCh
+	}
+
+	// close the client connection
+	n.conn.Close()
+
+	// shutdown the local server
+	// and deregister
+	select {
+	case <-n.exit:
+	default:
+		close(n.exit)
+	}
+
+	// set not connected
+	n.connected = false
+
+	return nil
+}
+
+func (n *natsBroker) Init(opts ...Option) error {
+	n.setOption(opts...)
+	return nil
+}
+
+func (n *natsBroker) Options() Options {
+	return n.opts
+}
+
+func (n *natsBroker) Publish(topic string, msg *Message, opts ...PublishOption) error {
+	b, err := n.opts.Codec.Marshal(msg)
+	if err != nil {
+		return err
+	}
+	n.RLock()
+	defer n.RUnlock()
+	return n.conn.Publish(topic, b)
+}
+
+func (n *natsBroker) Subscribe(topic string, handler Handler, opts ...SubscribeOption) (Subscriber, error) {
+	if n.conn == nil {
+		return nil, errors.New("not connected")
+	}
+
+	opt := SubscribeOptions{
+		AutoAck: true,
+		Context: context.Background(),
+	}
+
+	for _, o := range opts {
+		o(&opt)
+	}
+
+	fn := func(msg *nats.Msg) {
+		var m Message
+		if err := n.opts.Codec.Unmarshal(msg.Data, &m); err != nil {
+			return
+		}
+		handler(&publication{m: &m, t: msg.Subject})
+	}
+
+	var sub *nats.Subscription
+	var err error
+
+	n.RLock()
+	if len(opt.Queue) > 0 {
+		sub, err = n.conn.QueueSubscribe(topic, opt.Queue, fn)
+	} else {
+		sub, err = n.conn.Subscribe(topic, fn)
+	}
+	n.RUnlock()
+	if err != nil {
+		return nil, err
+	}
+	return &subscriber{s: sub, opts: opt}, nil
+}
+
+func (n *natsBroker) String() string {
+	return "eats"
+}
+
+func (n *natsBroker) setOption(opts ...Option) {
+	for _, o := range opts {
+		o(&n.opts)
+	}
+
+	n.Once.Do(func() {
+		n.nopts = nats.GetDefaultOptions()
+	})
+
+	// local embedded server
+	n.local = true
+	// set to drain
+	n.drain = true
+
+	if !n.opts.Secure {
+		n.opts.Secure = n.nopts.Secure
+	}
+
+	if n.opts.TLSConfig == nil {
+		n.opts.TLSConfig = n.nopts.TLSConfig
+	}
+
+	n.addrs = n.setAddrs(n.opts.Addrs)
+}
+
+func (n *natsBroker) onClose(conn *nats.Conn) {
+	n.closeCh <- nil
+}
+
+func (n *natsBroker) onAsyncError(conn *nats.Conn, sub *nats.Subscription, err error) {
+	// There are kinds of different async error nats might callback, but we are interested
+	// in ErrDrainTimeout only here.
+	if err == nats.ErrDrainTimeout {
+		n.closeCh <- err
+	}
+}
+
+func NewBroker(opts ...Option) Broker {
+	options := Options{
+		// Default codec
+		Codec:    json.Marshaler{},
+		Context:  context.Background(),
+		Registry: registry.DefaultRegistry,
+	}
+
+	n := &natsBroker{
+		opts: options,
+	}
+	n.setOption(opts...)
+
+	return n
+}

broker/http/http.go

@@ -1,11 +0,0 @@
-// Package http provides a http based message broker
-package http
-
-import (
-	"github.com/micro/go-micro/broker"
-)
-
-// NewBroker returns a new http broker
-func NewBroker(opts ...broker.Option) broker.Broker {
-	return broker.NewBroker(opts...)
-}

broker/http/options.go

@@ -1,23 +0,0 @@
-package http
-
-import (
-	"context"
-	"net/http"
-
-	"github.com/micro/go-micro/broker"
-)
-
-// Handle registers the handler for the given pattern.
-func Handle(pattern string, handler http.Handler) broker.Option {
-	return func(o *broker.Options) {
-		if o.Context == nil {
-			o.Context = context.Background()
-		}
-		handlers, ok := o.Context.Value("http_handlers").(map[string]http.Handler)
-		if !ok {
-			handlers = make(map[string]http.Handler)
-		}
-		handlers[pattern] = handler
-		o.Context = context.WithValue(o.Context, "http_handlers", handlers)
-	}
-}

broker/http_broker.go

@@ -1,704 +0,0 @@
-package broker
-
-import (
-	"bytes"
-	"context"
-	"crypto/tls"
-	"errors"
-	"fmt"
-	"io"
-	"io/ioutil"
-	"math/rand"
-	"net"
-	"net/http"
-	"net/url"
-	"runtime"
-	"sync"
-	"time"
-
-	"github.com/google/uuid"
-	"github.com/micro/go-micro/codec/json"
-	merr "github.com/micro/go-micro/errors"
-	"github.com/micro/go-micro/registry"
-	"github.com/micro/go-micro/registry/cache"
-	maddr "github.com/micro/go-micro/util/addr"
-	mnet "github.com/micro/go-micro/util/net"
-	mls "github.com/micro/go-micro/util/tls"
-	"golang.org/x/net/http2"
-)
-
-// HTTP Broker is a point to point async broker
-type httpBroker struct {
-	id      string
-	address string
-	opts    Options
-
-	mux *http.ServeMux
-
-	c *http.Client
-	r registry.Registry
-
-	sync.RWMutex
-	subscribers map[string][]*httpSubscriber
-	running     bool
-	exit        chan chan error
-
-	// offline message inbox
-	mtx   sync.RWMutex
-	inbox map[string][][]byte
-}
-
-type httpSubscriber struct {
-	opts  SubscribeOptions
-	id    string
-	topic string
-	fn    Handler
-	svc   *registry.Service
-	hb    *httpBroker
-}
-
-type httpEvent struct {
-	m *Message
-	t string
-}
-
-var (
-	DefaultSubPath   = "/_sub"
-	serviceName      = "go.micro.http.broker"
-	broadcastVersion = "ff.http.broadcast"
-	registerTTL      = time.Minute
-	registerInterval = time.Second * 30
-)
-
-func init() {
-	rand.Seed(time.Now().Unix())
-}
-
-func newTransport(config *tls.Config) *http.Transport {
-	if config == nil {
-		config = &tls.Config{
-			InsecureSkipVerify: true,
-		}
-	}
-
-	dialTLS := func(network string, addr string) (net.Conn, error) {
-		return tls.Dial(network, addr, config)
-	}
-
-	t := &http.Transport{
-		Proxy: http.ProxyFromEnvironment,
-		Dial: (&net.Dialer{
-			Timeout:   30 * time.Second,
-			KeepAlive: 30 * time.Second,
-		}).Dial,
-		TLSHandshakeTimeout: 10 * time.Second,
-		DialTLS:             dialTLS,
-	}
-	runtime.SetFinalizer(&t, func(tr **http.Transport) {
-		(*tr).CloseIdleConnections()
-	})
-
-	// setup http2
-	http2.ConfigureTransport(t)
-
-	return t
-}
-
-func newHttpBroker(opts ...Option) Broker {
-	options := Options{
-		Codec:   json.Marshaler{},
-		Context: context.TODO(),
-	}
-
-	for _, o := range opts {
-		o(&options)
-	}
-
-	// set address
-	addr := ":0"
-	if len(options.Addrs) > 0 && len(options.Addrs[0]) > 0 {
-		addr = options.Addrs[0]
-	}
-
-	// get registry
-	reg, ok := options.Context.Value(registryKey).(registry.Registry)
-	if !ok {
-		reg = registry.DefaultRegistry
-	}
-
-	h := &httpBroker{
-		id:          uuid.New().String(),
-		address:     addr,
-		opts:        options,
-		r:           reg,
-		c:           &http.Client{Transport: newTransport(options.TLSConfig)},
-		subscribers: make(map[string][]*httpSubscriber),
-		exit:        make(chan chan error),
-		mux:         http.NewServeMux(),
-		inbox:       make(map[string][][]byte),
-	}
-
-	// specify the message handler
-	h.mux.Handle(DefaultSubPath, h)
-
-	// get optional handlers
-	if h.opts.Context != nil {
-		handlers, ok := h.opts.Context.Value("http_handlers").(map[string]http.Handler)
-		if ok {
-			for pattern, handler := range handlers {
-				h.mux.Handle(pattern, handler)
-			}
-		}
-	}
-
-	return h
-}
-
-func (h *httpEvent) Ack() error {
-	return nil
-}
-
-func (h *httpEvent) Message() *Message {
-	return h.m
-}
-
-func (h *httpEvent) Topic() string {
-	return h.t
-}
-
-func (h *httpSubscriber) Options() SubscribeOptions {
-	return h.opts
-}
-
-func (h *httpSubscriber) Topic() string {
-	return h.topic
-}
-
-func (h *httpSubscriber) Unsubscribe() error {
-	return h.hb.unsubscribe(h)
-}
-
-func (h *httpBroker) saveMessage(topic string, msg []byte) {
-	h.mtx.Lock()
-	defer h.mtx.Unlock()
-
-	// get messages
-	c := h.inbox[topic]
-
-	// save message
-	c = append(c, msg)
-
-	// max length 64
-	if len(c) > 64 {
-		c = c[:64]
-	}
-
-	// save inbox
-	h.inbox[topic] = c
-}
-
-func (h *httpBroker) getMessage(topic string, num int) [][]byte {
-	h.mtx.Lock()
-	defer h.mtx.Unlock()
-
-	// get messages
-	c, ok := h.inbox[topic]
-	if !ok {
-		return nil
-	}
-
-	// more message than requests
-	if len(c) >= num {
-		msg := c[:num]
-		h.inbox[topic] = c[num:]
-		return msg
-	}
-
-	// reset inbox
-	h.inbox[topic] = nil
-
-	// return all messages
-	return c
-}
-
-func (h *httpBroker) subscribe(s *httpSubscriber) error {
-	h.Lock()
-	defer h.Unlock()
-
-	if err := h.r.Register(s.svc, registry.RegisterTTL(registerTTL)); err != nil {
-		return err
-	}
-
-	h.subscribers[s.topic] = append(h.subscribers[s.topic], s)
-	return nil
-}
-
-func (h *httpBroker) unsubscribe(s *httpSubscriber) error {
-	h.Lock()
-	defer h.Unlock()
-
-	//nolint:prealloc
-	var subscribers []*httpSubscriber
-
-	// look for subscriber
-	for _, sub := range h.subscribers[s.topic] {
-		// deregister and skip forward
-		if sub == s {
-			_ = h.r.Deregister(sub.svc)
-			continue
-		}
-		// keep subscriber
-		subscribers = append(subscribers, sub)
-	}
-
-	// set subscribers
-	h.subscribers[s.topic] = subscribers
-
-	return nil
-}
-
-func (h *httpBroker) run(l net.Listener) {
-	t := time.NewTicker(registerInterval)
-	defer t.Stop()
-
-	for {
-		select {
-		// heartbeat for each subscriber
-		case <-t.C:
-			h.RLock()
-			for _, subs := range h.subscribers {
-				for _, sub := range subs {
-					_ = h.r.Register(sub.svc, registry.RegisterTTL(registerTTL))
-				}
-			}
-			h.RUnlock()
-		// received exit signal
-		case ch := <-h.exit:
-			ch <- l.Close()
-			h.RLock()
-			for _, subs := range h.subscribers {
-				for _, sub := range subs {
-					_ = h.r.Deregister(sub.svc)
-				}
-			}
-			h.RUnlock()
-			return
-		}
-	}
-}
-
-func (h *httpBroker) ServeHTTP(w http.ResponseWriter, req *http.Request) {
-	if req.Method != "POST" {
-		err := merr.BadRequest("go.micro.broker", "Method not allowed")
-		http.Error(w, err.Error(), http.StatusMethodNotAllowed)
-		return
-	}
-	defer req.Body.Close()
-
-	req.ParseForm()
-
-	b, err := ioutil.ReadAll(req.Body)
-	if err != nil {
-		errr := merr.InternalServerError("go.micro.broker", "Error reading request body: %v", err)
-		w.WriteHeader(500)
-		w.Write([]byte(errr.Error()))
-		return
-	}
-
-	var m *Message
-	if err = h.opts.Codec.Unmarshal(b, &m); err != nil {
-		errr := merr.InternalServerError("go.micro.broker", "Error parsing request body: %v", err)
-		w.WriteHeader(500)
-		w.Write([]byte(errr.Error()))
-		return
-	}
-
-	topic := m.Header[":topic"]
-	delete(m.Header, ":topic")
-
-	if len(topic) == 0 {
-		errr := merr.InternalServerError("go.micro.broker", "Topic not found")
-		w.WriteHeader(500)
-		w.Write([]byte(errr.Error()))
-		return
-	}
-
-	p := &httpEvent{m: m, t: topic}
-	id := req.Form.Get("id")
-
-	//nolint:prealloc
-	var subs []Handler
-
-	h.RLock()
-	for _, subscriber := range h.subscribers[topic] {
-		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 {
-	h.RLock()
-	defer h.RUnlock()
-	return h.address
-}
-
-func (h *httpBroker) Connect() error {
-	h.RLock()
-	if h.running {
-		h.RUnlock()
-		return nil
-	}
-	h.RUnlock()
-
-	h.Lock()
-	defer h.Unlock()
-
-	var l net.Listener
-	var err error
-
-	if h.opts.Secure || h.opts.TLSConfig != nil {
-		config := h.opts.TLSConfig
-
-		fn := func(addr string) (net.Listener, error) {
-			if config == nil {
-				hosts := []string{addr}
-
-				// check if its a valid host:port
-				if host, _, err := net.SplitHostPort(addr); err == nil {
-					if len(host) == 0 {
-						hosts = maddr.IPs()
-					} else {
-						hosts = []string{host}
-					}
-				}
-
-				// generate a certificate
-				cert, err := mls.Certificate(hosts...)
-				if err != nil {
-					return nil, err
-				}
-				config = &tls.Config{Certificates: []tls.Certificate{cert}}
-			}
-			return tls.Listen("tcp", addr, config)
-		}
-
-		l, err = mnet.Listen(h.address, fn)
-	} else {
-		fn := func(addr string) (net.Listener, error) {
-			return net.Listen("tcp", addr)
-		}
-
-		l, err = mnet.Listen(h.address, fn)
-	}
-
-	if err != nil {
-		return err
-	}
-
-	addr := h.address
-	h.address = l.Addr().String()
-
-	go http.Serve(l, h.mux)
-	go func() {
-		h.run(l)
-		h.Lock()
-		h.opts.Addrs = []string{addr}
-		h.address = addr
-		h.Unlock()
-	}()
-
-	// get registry
-	reg, ok := h.opts.Context.Value(registryKey).(registry.Registry)
-	if !ok {
-		reg = registry.DefaultRegistry
-	}
-	// set cache
-	h.r = cache.New(reg)
-
-	// set running
-	h.running = true
-	return nil
-}
-
-func (h *httpBroker) Disconnect() error {
-	h.RLock()
-	if !h.running {
-		h.RUnlock()
-		return nil
-	}
-	h.RUnlock()
-
-	h.Lock()
-	defer h.Unlock()
-
-	// stop cache
-	rc, ok := h.r.(cache.Cache)
-	if ok {
-		rc.Stop()
-	}
-
-	// exit and return err
-	ch := make(chan error)
-	h.exit <- ch
-	err := <-ch
-
-	// set not running
-	h.running = false
-	return err
-}
-
-func (h *httpBroker) Init(opts ...Option) error {
-	h.RLock()
-	if h.running {
-		h.RUnlock()
-		return errors.New("cannot init while connected")
-	}
-	h.RUnlock()
-
-	h.Lock()
-	defer h.Unlock()
-
-	for _, o := range opts {
-		o(&h.opts)
-	}
-
-	if len(h.opts.Addrs) > 0 && len(h.opts.Addrs[0]) > 0 {
-		h.address = h.opts.Addrs[0]
-	}
-
-	if len(h.id) == 0 {
-		h.id = "go.micro.http.broker-" + uuid.New().String()
-	}
-
-	// get registry
-	reg, ok := h.opts.Context.Value(registryKey).(registry.Registry)
-	if !ok {
-		reg = registry.DefaultRegistry
-	}
-
-	// get cache
-	if rc, ok := h.r.(cache.Cache); ok {
-		rc.Stop()
-	}
-
-	// set registry
-	h.r = cache.New(reg)
-
-	// reconfigure tls config
-	if c := h.opts.TLSConfig; c != nil {
-		h.c = &http.Client{
-			Transport: newTransport(c),
-		}
-	}
-
-	return nil
-}
-
-func (h *httpBroker) Options() Options {
-	return h.opts
-}
-
-func (h *httpBroker) Publish(topic string, msg *Message, opts ...PublishOption) error {
-	// create the message first
-	m := &Message{
-		Header: make(map[string]string),
-		Body:   msg.Body,
-	}
-
-	for k, v := range msg.Header {
-		m.Header[k] = v
-	}
-
-	m.Header[":topic"] = topic
-
-	// encode the message
-	b, err := h.opts.Codec.Marshal(m)
-	if err != nil {
-		return err
-	}
-
-	// save the message
-	h.saveMessage(topic, b)
-
-	// now attempt to get the service
-	h.RLock()
-	s, err := h.r.GetService(serviceName)
-	if err != nil {
-		h.RUnlock()
-		// ignore error
-		return nil
-	}
-	h.RUnlock()
-
-	pub := func(node *registry.Node, t string, b []byte) error {
-		scheme := "http"
-
-		// check if secure is added in metadata
-		if node.Metadata["secure"] == "true" {
-			scheme = "https"
-		}
-
-		vals := url.Values{}
-		vals.Add("id", node.Id)
-
-		uri := fmt.Sprintf("%s://%s%s?%s", scheme, node.Address, DefaultSubPath, vals.Encode())
-		r, err := h.c.Post(uri, "application/json", bytes.NewReader(b))
-		if err != nil {
-			return err
-		}
-
-		// discard response body
-		io.Copy(ioutil.Discard, r.Body)
-		r.Body.Close()
-		return nil
-	}
-
-	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(nodes) == 0 {
-				continue
-			}
-
-			switch service.Version {
-			// broadcast version means broadcast to all nodes
-			case broadcastVersion:
-				var success bool
-
-				// publish to all nodes
-				for _, node := range nodes {
-					// publish async
-					if err := pub(node, topic, b); err == nil {
-						success = true
-					}
-				}
-
-				// save if it failed to publish at least once
-				if !success {
-					h.saveMessage(topic, b)
-				}
-			default:
-				// select node to publish to
-				node := nodes[rand.Int()%len(nodes)]
-
-				// publish async to one node
-				if err := pub(node, topic, b); err != nil {
-					// if failed save it
-					h.saveMessage(topic, b)
-				}
-			}
-		}
-	}
-
-	// do the rest async
-	go func() {
-		// get a third of the backlog
-		messages := h.getMessage(topic, 8)
-		delay := (len(messages) > 1)
-
-		// publish all the messages
-		for _, msg := range messages {
-			// serialize here
-			srv(s, msg)
-
-			// sending a backlog of messages
-			if delay {
-				time.Sleep(time.Millisecond * 100)
-			}
-		}
-	}()
-
-	return nil
-}
-
-func (h *httpBroker) Subscribe(topic string, handler Handler, opts ...SubscribeOption) (Subscriber, error) {
-	var err error
-	var host, port string
-	options := NewSubscribeOptions(opts...)
-
-	// parse address for host, port
-	host, port, err = net.SplitHostPort(h.Address())
-	if err != nil {
-		return nil, err
-	}
-
-	addr, err := maddr.Extract(host)
-	if err != nil {
-		return nil, err
-	}
-
-	var secure bool
-
-	if h.opts.Secure || h.opts.TLSConfig != nil {
-		secure = true
-	}
-
-	// register service
-	node := &registry.Node{
-		Id:      topic + "-" + h.id,
-		Address: mnet.HostPort(addr, port),
-		Metadata: map[string]string{
-			"secure": fmt.Sprintf("%t", secure),
-			"broker": "http",
-			"topic":  topic,
-		},
-	}
-
-	// check for queue group or broadcast queue
-	version := options.Queue
-	if len(version) == 0 {
-		version = broadcastVersion
-	}
-
-	service := &registry.Service{
-		Name:    serviceName,
-		Version: version,
-		Nodes:   []*registry.Node{node},
-	}
-
-	// generate subscriber
-	subscriber := &httpSubscriber{
-		opts:  options,
-		hb:    h,
-		id:    node.Id,
-		topic: topic,
-		fn:    handler,
-		svc:   service,
-	}
-
-	// subscribe now
-	if err := h.subscribe(subscriber); err != nil {
-		return nil, err
-	}
-
-	// return the subscriber
-	return subscriber, nil
-}
-
-func (h *httpBroker) String() string {
-	return "http"
-}

broker/http_broker_test.go

@@ -1,349 +0,0 @@
-package broker
-
-import (
-	"sync"
-	"testing"
-	"time"
-
-	glog "github.com/go-log/log"
-	"github.com/google/uuid"
-	"github.com/micro/go-micro/registry"
-	"github.com/micro/go-micro/registry/memory"
-	"github.com/micro/go-micro/util/log"
-)
-
-func newTestRegistry() registry.Registry {
-	return memory.NewRegistry(memory.Services(testData))
-}
-
-func sub(be *testing.B, c int) {
-	// set no op logger
-	log.SetLogger(glog.DefaultLogger)
-
-	be.StopTimer()
-	m := newTestRegistry()
-
-	b := NewBroker(Registry(m))
-	topic := uuid.New().String()
-
-	if err := b.Init(); err != nil {
-		be.Fatalf("Unexpected init error: %v", err)
-	}
-
-	if err := b.Connect(); err != nil {
-		be.Fatalf("Unexpected connect error: %v", err)
-	}
-
-	msg := &Message{
-		Header: map[string]string{
-			"Content-Type": "application/json",
-		},
-		Body: []byte(`{"message": "Hello World"}`),
-	}
-
-	var subs []Subscriber
-	done := make(chan bool, c)
-
-	for i := 0; i < c; i++ {
-		sub, err := b.Subscribe(topic, func(p Event) error {
-			done <- true
-			m := p.Message()
-
-			if string(m.Body) != string(msg.Body) {
-				be.Fatalf("Unexpected msg %s, expected %s", string(m.Body), string(msg.Body))
-			}
-
-			return nil
-		}, Queue("shared"))
-		if err != nil {
-			be.Fatalf("Unexpected subscribe error: %v", err)
-		}
-		subs = append(subs, sub)
-	}
-
-	for i := 0; i < be.N; i++ {
-		be.StartTimer()
-		if err := b.Publish(topic, msg); err != nil {
-			be.Fatalf("Unexpected publish error: %v", err)
-		}
-		<-done
-		be.StopTimer()
-	}
-
-	for _, sub := range subs {
-		sub.Unsubscribe()
-	}
-
-	if err := b.Disconnect(); err != nil {
-		be.Fatalf("Unexpected disconnect error: %v", err)
-	}
-}
-
-func pub(be *testing.B, c int) {
-	// set no op logger
-	log.SetLogger(glog.DefaultLogger)
-
-	be.StopTimer()
-	m := newTestRegistry()
-	b := NewBroker(Registry(m))
-	topic := uuid.New().String()
-
-	if err := b.Init(); err != nil {
-		be.Fatalf("Unexpected init error: %v", err)
-	}
-
-	if err := b.Connect(); err != nil {
-		be.Fatalf("Unexpected connect error: %v", err)
-	}
-
-	msg := &Message{
-		Header: map[string]string{
-			"Content-Type": "application/json",
-		},
-		Body: []byte(`{"message": "Hello World"}`),
-	}
-
-	done := make(chan bool, c*4)
-
-	sub, err := b.Subscribe(topic, func(p Event) error {
-		done <- true
-		m := p.Message()
-		if string(m.Body) != string(msg.Body) {
-			be.Fatalf("Unexpected msg %s, expected %s", string(m.Body), string(msg.Body))
-		}
-		return nil
-	}, Queue("shared"))
-	if err != nil {
-		be.Fatalf("Unexpected subscribe error: %v", err)
-	}
-
-	var wg sync.WaitGroup
-	ch := make(chan int, c*4)
-	be.StartTimer()
-
-	for i := 0; i < c; i++ {
-		go func() {
-			for range ch {
-				if err := b.Publish(topic, msg); err != nil {
-					be.Fatalf("Unexpected publish error: %v", err)
-				}
-				select {
-				case <-done:
-				case <-time.After(time.Second):
-				}
-				wg.Done()
-			}
-		}()
-	}
-
-	for i := 0; i < be.N; i++ {
-		wg.Add(1)
-		ch <- i
-	}
-
-	wg.Wait()
-	be.StopTimer()
-	sub.Unsubscribe()
-	close(ch)
-	close(done)
-
-	if err := b.Disconnect(); err != nil {
-		be.Fatalf("Unexpected disconnect error: %v", err)
-	}
-}
-
-func TestBroker(t *testing.T) {
-	m := newTestRegistry()
-	b := NewBroker(Registry(m))
-
-	if err := b.Init(); err != nil {
-		t.Fatalf("Unexpected init error: %v", err)
-	}
-
-	if err := b.Connect(); err != nil {
-		t.Fatalf("Unexpected connect error: %v", err)
-	}
-
-	msg := &Message{
-		Header: map[string]string{
-			"Content-Type": "application/json",
-		},
-		Body: []byte(`{"message": "Hello World"}`),
-	}
-
-	done := make(chan bool)
-
-	sub, err := b.Subscribe("test", func(p Event) error {
-		m := p.Message()
-
-		if string(m.Body) != string(msg.Body) {
-			t.Fatalf("Unexpected msg %s, expected %s", string(m.Body), string(msg.Body))
-		}
-
-		close(done)
-		return nil
-	})
-	if err != nil {
-		t.Fatalf("Unexpected subscribe error: %v", err)
-	}
-
-	if err := b.Publish("test", msg); err != nil {
-		t.Fatalf("Unexpected publish error: %v", err)
-	}
-
-	<-done
-	sub.Unsubscribe()
-
-	if err := b.Disconnect(); err != nil {
-		t.Fatalf("Unexpected disconnect error: %v", err)
-	}
-}
-
-func TestConcurrentSubBroker(t *testing.T) {
-	m := newTestRegistry()
-	b := NewBroker(Registry(m))
-
-	if err := b.Init(); err != nil {
-		t.Fatalf("Unexpected init error: %v", err)
-	}
-
-	if err := b.Connect(); err != nil {
-		t.Fatalf("Unexpected connect error: %v", err)
-	}
-
-	msg := &Message{
-		Header: map[string]string{
-			"Content-Type": "application/json",
-		},
-		Body: []byte(`{"message": "Hello World"}`),
-	}
-
-	var subs []Subscriber
-	var wg sync.WaitGroup
-
-	for i := 0; i < 10; i++ {
-		sub, err := b.Subscribe("test", func(p Event) error {
-			defer wg.Done()
-
-			m := p.Message()
-
-			if string(m.Body) != string(msg.Body) {
-				t.Fatalf("Unexpected msg %s, expected %s", string(m.Body), string(msg.Body))
-			}
-
-			return nil
-		})
-		if err != nil {
-			t.Fatalf("Unexpected subscribe error: %v", err)
-		}
-
-		wg.Add(1)
-		subs = append(subs, sub)
-	}
-
-	if err := b.Publish("test", msg); err != nil {
-		t.Fatalf("Unexpected publish error: %v", err)
-	}
-
-	wg.Wait()
-
-	for _, sub := range subs {
-		sub.Unsubscribe()
-	}
-
-	if err := b.Disconnect(); err != nil {
-		t.Fatalf("Unexpected disconnect error: %v", err)
-	}
-}
-
-func TestConcurrentPubBroker(t *testing.T) {
-	m := newTestRegistry()
-	b := NewBroker(Registry(m))
-
-	if err := b.Init(); err != nil {
-		t.Fatalf("Unexpected init error: %v", err)
-	}
-
-	if err := b.Connect(); err != nil {
-		t.Fatalf("Unexpected connect error: %v", err)
-	}
-
-	msg := &Message{
-		Header: map[string]string{
-			"Content-Type": "application/json",
-		},
-		Body: []byte(`{"message": "Hello World"}`),
-	}
-
-	var wg sync.WaitGroup
-
-	sub, err := b.Subscribe("test", func(p Event) error {
-		defer wg.Done()
-
-		m := p.Message()
-
-		if string(m.Body) != string(msg.Body) {
-			t.Fatalf("Unexpected msg %s, expected %s", string(m.Body), string(msg.Body))
-		}
-
-		return nil
-	})
-	if err != nil {
-		t.Fatalf("Unexpected subscribe error: %v", err)
-	}
-
-	for i := 0; i < 10; i++ {
-		wg.Add(1)
-
-		if err := b.Publish("test", msg); err != nil {
-			t.Fatalf("Unexpected publish error: %v", err)
-		}
-	}
-
-	wg.Wait()
-
-	sub.Unsubscribe()
-
-	if err := b.Disconnect(); err != nil {
-		t.Fatalf("Unexpected disconnect error: %v", err)
-	}
-}
-
-func BenchmarkSub1(b *testing.B) {
-	sub(b, 1)
-}
-func BenchmarkSub8(b *testing.B) {
-	sub(b, 8)
-}
-
-func BenchmarkSub32(b *testing.B) {
-	sub(b, 32)
-}
-
-func BenchmarkSub64(b *testing.B) {
-	sub(b, 64)
-}
-
-func BenchmarkSub128(b *testing.B) {
-	sub(b, 128)
-}
-
-func BenchmarkPub1(b *testing.B) {
-	pub(b, 1)
-}
-
-func BenchmarkPub8(b *testing.B) {
-	pub(b, 8)
-}
-
-func BenchmarkPub32(b *testing.B) {
-	pub(b, 32)
-}
-
-func BenchmarkPub64(b *testing.B) {
-	pub(b, 64)
-}
-
-func BenchmarkPub128(b *testing.B) {
-	pub(b, 128)
-}

broker/nats/nats.go

@@ -4,23 +4,44 @@ package nats
 import (
 	"context"
 	"errors"
+	"net"
+	"net/url"
+	"strconv"
 	"strings"
 	"sync"
+	"time"
 
 	"github.com/micro/go-micro/broker"
 	"github.com/micro/go-micro/codec/json"
+	"github.com/micro/go-micro/registry"
+	"github.com/micro/go-micro/util/addr"
+	"github.com/micro/go-micro/util/log"
+	"github.com/nats-io/nats-server/v2/server"
 	nats "github.com/nats-io/nats.go"
 )
 
 type natsBroker struct {
 	sync.Once
 	sync.RWMutex
-	addrs   []string
-	conn    *nats.Conn
-	opts    broker.Options
-	nopts   nats.Options
+
+	// indicate if we're connected
+	connected bool
+
+	addrs []string
+	conn  *nats.Conn
+	opts  broker.Options
+	nopts nats.Options
+
+	// should we drain the connection
 	drain   bool
 	closeCh chan (error)
+
+	// embedded server
+	server *server.Server
+	// configure to use local server
+	local bool
+	// server exit channel
+	exit chan bool
 }
 
 type subscriber struct {
@@ -62,6 +83,7 @@ func (n *natsBroker) Address() string {
 	if n.conn != nil && n.conn.IsConnected() {
 		return n.conn.ConnectedUrl()
 	}
+
 	if len(n.addrs) > 0 {
 		return n.addrs[0]
 	}
@@ -69,7 +91,7 @@ func (n *natsBroker) Address() string {
 	return ""
 }
 
-func setAddrs(addrs []string) []string {
+func (n *natsBroker) setAddrs(addrs []string) []string {
 	//nolint:prealloc
 	var cAddrs []string
 	for _, addr := range addrs {
@@ -81,16 +103,186 @@ func setAddrs(addrs []string) []string {
 		}
 		cAddrs = append(cAddrs, addr)
 	}
-	if len(cAddrs) == 0 {
+	// if there's no address and we weren't told to
+	// embed a local server then use the default url
+	if len(cAddrs) == 0 && !n.local {
 		cAddrs = []string{nats.DefaultURL}
 	}
 	return cAddrs
 }
 
+// serve stats a local nats server if needed
+func (n *natsBroker) serve(exit chan bool) error {
+	var host string
+	var port int
+	var local bool
+
+	// with no address we just default it
+	// this is a local client address
+	if len(n.addrs) == 0 {
+		// find an advertiseable ip
+		if h, err := addr.Extract(""); err != nil {
+			host = "127.0.0.1"
+		} else {
+			host = h
+		}
+
+		port = -1
+		local = true
+	} else {
+		address := n.addrs[0]
+		if strings.HasPrefix(address, "nats://") {
+			address = strings.TrimPrefix(address, "nats://")
+		}
+
+		// check if its a local address and only then embed
+		if addr.IsLocal(address) {
+			h, p, err := net.SplitHostPort(address)
+			if err == nil {
+				host = h
+				port, _ = strconv.Atoi(p)
+				local = true
+			}
+		}
+	}
+
+	// we only setup a server for local things
+	if !local {
+		return nil
+	}
+
+	// 1. create new server
+	// 2. register the server
+	// 3. connect to other servers
+	var cOpts server.ClusterOpts
+	var routes []*url.URL
+
+	// get existing nats servers to connect to
+	services, err := n.opts.Registry.GetService("go.micro.nats.broker")
+	if err == nil {
+		for _, service := range services {
+			for _, node := range service.Nodes {
+				u, err := url.Parse("nats://" + node.Address)
+				if err != nil {
+					log.Log(err)
+					continue
+				}
+				// append to the cluster routes
+				routes = append(routes, u)
+			}
+		}
+	}
+
+	// try get existing server
+	s := n.server
+
+	// get a host address
+	caddr, err := addr.Extract("")
+	if err != nil {
+		caddr = "0.0.0.0"
+	}
+
+	// set cluster opts
+	cOpts = server.ClusterOpts{
+		Host: caddr,
+		Port: -1,
+	}
+
+	if s == nil {
+		var err error
+		s, err = server.NewServer(&server.Options{
+			// Specify the host
+			Host: host,
+			// Use a random port
+			Port: port,
+			// Set the cluster ops
+			Cluster: cOpts,
+			// Set the routes
+			Routes:         routes,
+			NoLog:          true,
+			NoSigs:         true,
+			MaxControlLine: 2048,
+			TLSConfig:      n.opts.TLSConfig,
+		})
+		if err != nil {
+			return err
+		}
+
+		// save the server
+		n.server = s
+	}
+
+	// start the server
+	go s.Start()
+
+	var ready bool
+
+	// wait till its ready for connections
+	for i := 0; i < 3; i++ {
+		if s.ReadyForConnections(time.Second) {
+			ready = true
+			break
+		}
+	}
+
+	if !ready {
+		return errors.New("server not ready")
+	}
+
+	// set the client address
+	n.addrs = []string{s.ClientURL()}
+
+	go func() {
+		// register the cluster address
+		for {
+			select {
+			case <-exit:
+				// deregister on exit
+				n.opts.Registry.Deregister(&registry.Service{
+					Name:    "go.micro.nats.broker",
+					Version: "v2",
+					Nodes: []*registry.Node{
+						{Id: s.ID(), Address: s.ClusterAddr().String()},
+					},
+				})
+				s.Shutdown()
+				return
+			default:
+				// register the broker
+				n.opts.Registry.Register(&registry.Service{
+					Name:    "go.micro.nats.broker",
+					Version: "v2",
+					Nodes: []*registry.Node{
+						{Id: s.ID(), Address: s.ClusterAddr().String()},
+					},
+				}, registry.RegisterTTL(time.Minute))
+				time.Sleep(time.Minute)
+			}
+		}
+	}()
+
+	return nil
+}
+
 func (n *natsBroker) Connect() error {
 	n.Lock()
 	defer n.Unlock()
 
+	if !n.connected {
+		// create exit chan
+		n.exit = make(chan bool)
+
+		// start embedded server if asked to
+		if n.local {
+			if err := n.serve(n.exit); err != nil {
+				return err
+			}
+		}
+
+		// set to connected
+		n.connected = true
+	}
+
 	status := nats.CLOSED
 	if n.conn != nil {
 		status = n.conn.Status()
@@ -122,11 +314,29 @@ func (n *natsBroker) Connect() error {
 func (n *natsBroker) Disconnect() error {
 	n.RLock()
 	defer n.RUnlock()
+
+	// drain the connection if specified
 	if n.drain {
 		n.conn.Drain()
 		return <-n.closeCh
 	}
+
+	// close the client connection
 	n.conn.Close()
+
+	// shutdown the local server
+	// and deregister
+	if n.server != nil {
+		select {
+		case <-n.exit:
+		default:
+			close(n.exit)
+		}
+	}
+
+	// set not connected
+	n.connected = false
+
 	return nil
 }
 
@@ -191,21 +401,6 @@ func (n *natsBroker) String() string {
 	return "nats"
 }
 
-func NewBroker(opts ...broker.Option) broker.Broker {
-	options := broker.Options{
-		// Default codec
-		Codec:   json.Marshaler{},
-		Context: context.Background(),
-	}
-
-	n := &natsBroker{
-		opts: options,
-	}
-	n.setOption(opts...)
-
-	return n
-}
-
 func (n *natsBroker) setOption(opts ...broker.Option) {
 	for _, o := range opts {
 		o(&n.opts)
@@ -219,10 +414,15 @@ func (n *natsBroker) setOption(opts ...broker.Option) {
 		n.nopts = nopts
 	}
 
+	local, ok := n.opts.Context.Value(localServerKey{}).(bool)
+	if ok {
+		n.local = local
+	}
+
 	// broker.Options have higher priority than nats.Options
 	// only if Addrs, Secure or TLSConfig were not set through a broker.Option
 	// we read them from nats.Option
-	if len(n.opts.Addrs) == 0 {
+	if len(n.opts.Addrs) == 0 && !n.local {
 		n.opts.Addrs = n.nopts.Servers
 	}
 
@@ -233,7 +433,7 @@ func (n *natsBroker) setOption(opts ...broker.Option) {
 	if n.opts.TLSConfig == nil {
 		n.opts.TLSConfig = n.nopts.TLSConfig
 	}
-	n.addrs = setAddrs(n.opts.Addrs)
+	n.addrs = n.setAddrs(n.opts.Addrs)
 
 	if n.opts.Context.Value(drainConnectionKey{}) != nil {
 		n.drain = true
@@ -254,3 +454,19 @@ func (n *natsBroker) onAsyncError(conn *nats.Conn, sub *nats.Subscription, err e
 		n.closeCh <- err
 	}
 }
+
+func NewBroker(opts ...broker.Option) broker.Broker {
+	options := broker.Options{
+		// Default codec
+		Codec:    json.Marshaler{},
+		Context:  context.Background(),
+		Registry: registry.DefaultRegistry,
+	}
+
+	n := &natsBroker{
+		opts: options,
+	}
+	n.setOption(opts...)
+
+	return n
+}

broker/nats/options.go

@@ -7,12 +7,18 @@ import (
 
 type optionsKey struct{}
 type drainConnectionKey struct{}
+type localServerKey struct{}
 
 // Options accepts nats.Options
 func Options(opts nats.Options) broker.Option {
 	return setBrokerOption(optionsKey{}, opts)
 }
 
+// LocalServer embeds a local server rather than connecting to one
+func LocalServer() broker.Option {
+	return setBrokerOption(localServerKey{}, true)
+}
+
 // DrainConnection will drain subscription on close
 func DrainConnection() broker.Option {
 	return setBrokerOption(drainConnectionKey{}, struct{}{})

broker/options.go

@@ -13,6 +13,8 @@ type Options struct {
 	Secure    bool
 	Codec     codec.Marshaler
 	TLSConfig *tls.Config
+	// Registry used for clustering
+	Registry registry.Registry
 	// Other options for implementations of the interface
 	// can be stored in a context
 	Context context.Context
@@ -44,10 +46,6 @@ type PublishOption func(*PublishOptions)
 
 type SubscribeOption func(*SubscribeOptions)
 
-var (
-	registryKey = "github.com/micro/go-micro/registry"
-)
-
 func NewSubscribeOptions(opts ...SubscribeOption) SubscribeOptions {
 	opt := SubscribeOptions{
 		AutoAck: true,
@@ -92,7 +90,7 @@ func Queue(name string) SubscribeOption {
 
 func Registry(r registry.Registry) Option {
 	return func(o *Options) {
-		o.Context = context.WithValue(o.Context, registryKey, r)
+		o.Registry = r
 	}
 }
 

broker/service/handler/handler.go

@@ -1,66 +0,0 @@
-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/service.go

@@ -124,9 +124,11 @@ func NewBroker(opts ...broker.Option) broker.Broker {
 		addrs = []string{"127.0.0.1:8001"}
 	}
 
+	cli := client.DefaultClient
+
 	return &serviceBroker{
 		Addrs:   addrs,
-		Client:  pb.NewBrokerService(DefaultName, client.DefaultClient),
+		Client:  pb.NewBrokerService(DefaultName, cli),
 		options: options,
 	}
 }

client/client.go

@@ -110,6 +110,9 @@ var (
 	DefaultPoolSize = 100
 	// DefaultPoolTTL sets the connection pool ttl
 	DefaultPoolTTL = time.Minute
+
+	// NewClient returns a new client
+	NewClient func(...Option) Client = newRpcClient
 )
 
 // Makes a synchronous call to a service using the default client
@@ -128,11 +131,6 @@ func NewMessage(topic string, payload interface{}, opts ...MessageOption) Messag
 	return DefaultClient.NewMessage(topic, payload, opts...)
 }
 
-// Creates a new client with the options passed in
-func NewClient(opt ...Option) Client {
-	return newRpcClient(opt...)
-}
-
 // Creates a new request using the default client. Content Type will
 // be set to the default within options and use the appropriate codec
 func NewRequest(service, endpoint string, request interface{}, reqOpts ...RequestOption) Request {

client/grpc/codec.go

@@ -116,10 +116,12 @@ func (jsonCodec) Marshal(v interface{}) ([]byte, error) {
 }
 
 func (jsonCodec) Unmarshal(data []byte, v interface{}) error {
+	if len(data) == 0 {
+		return nil
+	}
 	if pb, ok := v.(proto.Message); ok {
 		return jsonpb.Unmarshal(b.NewReader(data), pb)
 	}
-
 	return json.Unmarshal(data, v)
 }
 

client/grpc/grpc.go

@@ -12,12 +12,10 @@ import (
 	"github.com/micro/go-micro/broker"
 	"github.com/micro/go-micro/client"
 	"github.com/micro/go-micro/client/selector"
-	"github.com/micro/go-micro/codec"
 	raw "github.com/micro/go-micro/codec/bytes"
 	"github.com/micro/go-micro/errors"
 	"github.com/micro/go-micro/metadata"
 	"github.com/micro/go-micro/registry"
-	"github.com/micro/go-micro/transport"
 
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/credentials"
@@ -209,11 +207,15 @@ func (g *grpcClient) stream(ctx context.Context, node *registry.Node, req client
 		ServerStreams: true,
 	}
 
-	grpcCallOptions := []grpc.CallOption{}
+	grpcCallOptions := []grpc.CallOption{grpc.CallContentSubtype(cf.Name())}
 	if opts := g.getGrpcCallOptions(); opts != nil {
 		grpcCallOptions = append(grpcCallOptions, opts...)
 	}
-	st, err := cc.NewStream(ctx, desc, methodToGRPC(req.Service(), req.Endpoint()), grpcCallOptions...)
+
+	// create a new cancelling context
+	newCtx, cancel := context.WithCancel(ctx)
+
+	st, err := cc.NewStream(newCtx, desc, methodToGRPC(req.Service(), req.Endpoint()), grpcCallOptions...)
 	if err != nil {
 		return nil, errors.InternalServerError("go.micro.client", fmt.Sprintf("Error creating stream: %v", err))
 	}
@@ -241,9 +243,32 @@ func (g *grpcClient) stream(ctx context.Context, node *registry.Node, req client
 		response: rsp,
 		stream:   st,
 		conn:     cc,
+		cancel:   cancel,
 	}, nil
 }
 
+func (g *grpcClient) poolMaxStreams() int {
+	if g.opts.Context == nil {
+		return DefaultPoolMaxStreams
+	}
+	v := g.opts.Context.Value(poolMaxStreams{})
+	if v == nil {
+		return DefaultPoolMaxStreams
+	}
+	return v.(int)
+}
+
+func (g *grpcClient) poolMaxIdle() int {
+	if g.opts.Context == nil {
+		return DefaultPoolMaxIdle
+	}
+	v := g.opts.Context.Value(poolMaxIdle{})
+	if v == nil {
+		return DefaultPoolMaxIdle
+	}
+	return v.(int)
+}
+
 func (g *grpcClient) maxRecvMsgSizeValue() int {
 	if g.opts.Context == nil {
 		return DefaultMaxRecvMsgSize
@@ -601,47 +626,21 @@ func (g *grpcClient) getGrpcCallOptions() []grpc.CallOption {
 }
 
 func newClient(opts ...client.Option) client.Client {
-	options := client.Options{
-		Codecs: make(map[string]codec.NewCodec),
-		CallOptions: client.CallOptions{
-			Backoff:        client.DefaultBackoff,
-			Retry:          client.DefaultRetry,
-			Retries:        client.DefaultRetries,
-			RequestTimeout: client.DefaultRequestTimeout,
-			DialTimeout:    transport.DefaultDialTimeout,
-		},
-		PoolSize: client.DefaultPoolSize,
-		PoolTTL:  client.DefaultPoolTTL,
-	}
+	options := client.NewOptions()
+	// default content type for grpc
+	options.ContentType = "application/grpc+proto"
 
 	for _, o := range opts {
 		o(&options)
 	}
 
-	if len(options.ContentType) == 0 {
-		options.ContentType = "application/grpc+proto"
-	}
-
-	if options.Broker == nil {
-		options.Broker = broker.DefaultBroker
-	}
-
-	if options.Registry == nil {
-		options.Registry = registry.DefaultRegistry
-	}
-
-	if options.Selector == nil {
-		options.Selector = selector.NewSelector(
-			selector.Registry(options.Registry),
-		)
-	}
-
 	rc := &grpcClient{
 		once: sync.Once{},
 		opts: options,
-		pool: newPool(options.PoolSize, options.PoolTTL),
 	}
 
+	rc.pool = newPool(options.PoolSize, options.PoolTTL, rc.poolMaxIdle(), rc.poolMaxStreams())
+
 	c := client.Client(rc)
 
 	// wrap in reverse

client/grpc/grpc_pool.go

@@ -11,73 +11,181 @@ type pool struct {
 	size int
 	ttl  int64
 
+	//  max streams on a *poolConn
+	maxStreams int
+	//  max idle conns
+	maxIdle int
+
 	sync.Mutex
-	conns map[string][]*poolConn
+	conns map[string]*streamsPool
+}
+
+type streamsPool struct {
+	//  head of list
+	head *poolConn
+	//  busy conns list
+	busy *poolConn
+	//  the siza of list
+	count int
+	//  idle conn
+	idle int
 }
 
 type poolConn struct {
+	//  grpc conn
 	*grpc.ClientConn
+	err  error
+	addr string
+
+	//  pool and streams pool
+	pool    *pool
+	sp      *streamsPool
+	streams int
 	created int64
+
+	//  list
+	pre  *poolConn
+	next *poolConn
+	in   bool
 }
 
-func newPool(size int, ttl time.Duration) *pool {
+func newPool(size int, ttl time.Duration, idle int, ms int) *pool {
+	if ms <= 0 {
+		ms = 1
+	}
+	if idle < 0 {
+		idle = 0
+	}
 	return &pool{
-		size:  size,
-		ttl:   int64(ttl.Seconds()),
-		conns: make(map[string][]*poolConn),
+		size:       size,
+		ttl:        int64(ttl.Seconds()),
+		maxStreams: ms,
+		maxIdle:    idle,
+		conns:      make(map[string]*streamsPool),
 	}
 }
 
 func (p *pool) getConn(addr string, opts ...grpc.DialOption) (*poolConn, error) {
-	p.Lock()
-	conns := p.conns[addr]
 	now := time.Now().Unix()
-
-	// while we have conns check age and then return one
-	// otherwise we'll create a new conn
-	for len(conns) > 0 {
-		conn := conns[len(conns)-1]
-		conns = conns[:len(conns)-1]
-		p.conns[addr] = conns
-
-		// if conn is old kill it and move on
-		if d := now - conn.created; d > p.ttl {
-			conn.ClientConn.Close()
+	p.Lock()
+	sp, ok := p.conns[addr]
+	if !ok {
+		sp = &streamsPool{head: &poolConn{}, busy: &poolConn{}, count: 0, idle: 0}
+		p.conns[addr] = sp
+	}
+	//  while we have conns check streams and then return one
+	//  otherwise we'll create a new conn
+	conn := sp.head.next
+	for conn != nil {
+		//  a old conn
+		if now-conn.created > p.ttl {
+			next := conn.next
+			if conn.streams == 0 {
+				removeConn(conn)
+				conn.ClientConn.Close()
+				sp.idle--
+			}
+			conn = next
 			continue
 		}
-
-		// we got a good conn, lets unlock and return it
+		//  a busy conn
+		if conn.streams >= p.maxStreams {
+			next := conn.next
+			removeConn(conn)
+			addConnAfter(conn, sp.busy)
+			conn = next
+			continue
+		}
+		//  a idle conn
+		if conn.streams == 0 {
+			sp.idle--
+		}
+		//  a good conn
+		conn.streams++
 		p.Unlock()
-
 		return conn, nil
 	}
-
 	p.Unlock()
 
-	// create new conn
+	//  create new conn
 	cc, err := grpc.Dial(addr, opts...)
 	if err != nil {
 		return nil, err
 	}
+	conn = &poolConn{cc, nil, addr, p, sp, 1, time.Now().Unix(), nil, nil, false}
 
-	return &poolConn{cc, time.Now().Unix()}, nil
+	//  add conn to streams pool
+	p.Lock()
+	if sp.count < p.size {
+		addConnAfter(conn, sp.head)
+	}
+	p.Unlock()
+
+	return conn, nil
 }
 
 func (p *pool) release(addr string, conn *poolConn, err error) {
-	// don't store the conn if it has errored
-	if err != nil {
-		conn.ClientConn.Close()
-		return
-	}
-
-	// otherwise put it back for reuse
 	p.Lock()
-	conns := p.conns[addr]
-	if len(conns) >= p.size {
+	p, sp, created := conn.pool, conn.sp, conn.created
+	//  try to add conn
+	if !conn.in && sp.count < p.size {
+		addConnAfter(conn, sp.head)
+	}
+	if !conn.in {
 		p.Unlock()
 		conn.ClientConn.Close()
 		return
 	}
-	p.conns[addr] = append(conns, conn)
+	//  a busy conn
+	if conn.streams >= p.maxStreams {
+		removeConn(conn)
+		addConnAfter(conn, sp.head)
+	}
+	conn.streams--
+	//  if streams == 0, we can do something
+	if conn.streams == 0 {
+		//  1. it has errored
+		//  2. too many idle conn or
+		//  3. conn is too old
+		now := time.Now().Unix()
+		if err != nil || sp.idle >= p.maxIdle || now-created > p.ttl {
+			removeConn(conn)
+			p.Unlock()
+			conn.ClientConn.Close()
+			return
+		}
+		sp.idle++
+	}
 	p.Unlock()
+	return
+}
+
+func (conn *poolConn) Close() {
+	conn.pool.release(conn.addr, conn, conn.err)
+}
+
+func removeConn(conn *poolConn) {
+	if conn.pre != nil {
+		conn.pre.next = conn.next
+	}
+	if conn.next != nil {
+		conn.next.pre = conn.pre
+	}
+	conn.pre = nil
+	conn.next = nil
+	conn.in = false
+	conn.sp.count--
+	return
+}
+
+func addConnAfter(conn *poolConn, after *poolConn) {
+	conn.next = after.next
+	conn.pre = after
+	if after.next != nil {
+		after.next.pre = conn
+	}
+	after.next = conn
+	conn.in = true
+	conn.sp.count++
+	return
 }

client/grpc/grpc_pool_test.go

@@ -11,7 +11,7 @@ import (
 	pb "google.golang.org/grpc/examples/helloworld/helloworld"
 )
 
-func testPool(t *testing.T, size int, ttl time.Duration) {
+func testPool(t *testing.T, size int, ttl time.Duration, idle int, ms int) {
 	// setup server
 	l, err := net.Listen("tcp", ":0")
 	if err != nil {
@@ -26,7 +26,7 @@ func testPool(t *testing.T, size int, ttl time.Duration) {
 	defer s.Stop()
 
 	// zero pool
-	p := newPool(size, ttl)
+	p := newPool(size, ttl, idle, ms)
 
 	for i := 0; i < 10; i++ {
 		// get a conn
@@ -50,7 +50,7 @@ func testPool(t *testing.T, size int, ttl time.Duration) {
 		p.release(l.Addr().String(), cc, nil)
 
 		p.Lock()
-		if i := len(p.conns[l.Addr().String()]); i > size {
+		if i := p.conns[l.Addr().String()].count; i > size {
 			p.Unlock()
 			t.Fatalf("pool size %d is greater than expected %d", i, size)
 		}
@@ -59,6 +59,6 @@ func testPool(t *testing.T, size int, ttl time.Duration) {
 }
 
 func TestGRPCPool(t *testing.T) {
-	testPool(t, 0, time.Minute)
-	testPool(t, 2, time.Minute)
+	testPool(t, 0, time.Minute, 10, 2)
+	testPool(t, 2, time.Minute, 10, 1)
 }

client/grpc/options.go

@@ -11,6 +11,14 @@ import (
 )
 
 var (
+	// DefaultPoolMaxStreams maximum streams on a connectioin
+	// (20)
+	DefaultPoolMaxStreams = 20
+
+	// DefaultPoolMaxIdle maximum idle conns of a pool
+	// (50)
+	DefaultPoolMaxIdle = 50
+
 	// DefaultMaxRecvMsgSize maximum message that client can receive
 	// (4 MB).
 	DefaultMaxRecvMsgSize = 1024 * 1024 * 4
@@ -20,6 +28,8 @@ var (
 	DefaultMaxSendMsgSize = 1024 * 1024 * 4
 )
 
+type poolMaxStreams struct{}
+type poolMaxIdle struct{}
 type codecsKey struct{}
 type tlsAuth struct{}
 type maxRecvMsgSizeKey struct{}
@@ -27,6 +37,26 @@ type maxSendMsgSizeKey struct{}
 type grpcDialOptions struct{}
 type grpcCallOptions struct{}
 
+// maximum streams on a connectioin
+func PoolMaxStreams(n int) client.Option {
+	return func(o *client.Options) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, poolMaxStreams{}, n)
+	}
+}
+
+// maximum idle conns of a pool
+func PoolMaxIdle(d int) client.Option {
+	return func(o *client.Options) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, poolMaxIdle{}, d)
+	}
+}
+
 // gRPC Codec to be used to encode/decode requests for a given content type
 func Codec(contentType string, c encoding.Codec) client.Option {
 	return func(o *client.Options) {

client/grpc/stream.go

@@ -12,12 +12,14 @@ import (
 // Implements the streamer interface
 type grpcStream struct {
 	sync.RWMutex
+	closed   bool
 	err      error
 	conn     *grpc.ClientConn
 	stream   grpc.ClientStream
 	request  client.Request
 	response client.Response
 	context  context.Context
+	cancel   func()
 }
 
 func (g *grpcStream) Context() context.Context {
@@ -46,7 +48,7 @@ func (g *grpcStream) Recv(msg interface{}) (err error) {
 		// #202 - inconsistent gRPC stream behavior
 		// the only way to tell if the stream is done is when we get a EOF on the Recv
 		// here we should close the underlying gRPC ClientConn
-		closeErr := g.conn.Close()
+		closeErr := g.Close()
 		if err == io.EOF && closeErr != nil {
 			err = closeErr
 		}
@@ -72,5 +74,15 @@ func (g *grpcStream) setError(e error) {
 // stream should still be able to receive after this function call
 // TODO: should the conn be closed in another way?
 func (g *grpcStream) Close() error {
-	return g.stream.CloseSend()
+	g.Lock()
+	defer g.Unlock()
+
+	if g.closed {
+		return nil
+	}
+	// cancel the context
+	g.cancel()
+	g.closed = true
+	g.stream.CloseSend()
+	return g.conn.Close()
 }

client/mock/context.go

@@ -1,16 +0,0 @@
-package mock
-
-import (
-	"context"
-)
-
-type responseKey struct{}
-
-func fromContext(ctx context.Context) (map[string][]MockResponse, bool) {
-	r, ok := ctx.Value(responseKey{}).(map[string][]MockResponse)
-	return r, ok
-}
-
-func newContext(ctx context.Context, r map[string][]MockResponse) context.Context {
-	return context.WithValue(ctx, responseKey{}, r)
-}

client/mock/mock.go

@@ -1,136 +0,0 @@
-// Package mock provides a mock client for testing
-package mock
-
-import (
-	"context"
-	"fmt"
-	"reflect"
-	"sync"
-
-	"github.com/micro/go-micro/client"
-	"github.com/micro/go-micro/errors"
-)
-
-var (
-	_ client.Client = NewClient()
-)
-
-type MockResponse struct {
-	Endpoint string
-	Response interface{}
-	Error    error
-}
-
-type MockClient struct {
-	Client client.Client
-	Opts   client.Options
-
-	sync.Mutex
-	Response map[string][]MockResponse
-}
-
-func (m *MockClient) Init(opts ...client.Option) error {
-	m.Lock()
-	defer m.Unlock()
-
-	for _, opt := range opts {
-		opt(&m.Opts)
-	}
-
-	r, ok := fromContext(m.Opts.Context)
-	if !ok {
-		r = make(map[string][]MockResponse)
-	}
-	m.Response = r
-
-	return nil
-}
-
-func (m *MockClient) Options() client.Options {
-	return m.Opts
-}
-
-func (m *MockClient) NewMessage(topic string, msg interface{}, opts ...client.MessageOption) client.Message {
-	return m.Client.NewMessage(topic, msg, opts...)
-}
-
-func (m *MockClient) NewRequest(service, endpoint string, req interface{}, reqOpts ...client.RequestOption) client.Request {
-	return m.Client.NewRequest(service, endpoint, req, reqOpts...)
-}
-
-func (m *MockClient) Call(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
-	m.Lock()
-	defer m.Unlock()
-
-	response, ok := m.Response[req.Service()]
-	if !ok {
-		return errors.NotFound("go.micro.client.mock", "service not found")
-	}
-
-	for _, r := range response {
-		if r.Endpoint != req.Endpoint() {
-			continue
-		}
-
-		if r.Error != nil {
-			return r.Error
-		}
-
-		v := reflect.ValueOf(rsp)
-
-		if t := reflect.TypeOf(rsp); t.Kind() == reflect.Ptr {
-			v = reflect.Indirect(v)
-		}
-		response := r.Response
-		if t := reflect.TypeOf(r.Response); t.Kind() == reflect.Func {
-			var request []reflect.Value
-			if t.NumIn() == 1 {
-				request = append(request, reflect.ValueOf(req.Body()))
-			}
-			response = reflect.ValueOf(r.Response).Call(request)[0].Interface()
-		}
-
-		v.Set(reflect.ValueOf(response))
-
-		return nil
-	}
-
-	return fmt.Errorf("rpc: can't find service %s", req.Endpoint())
-}
-
-func (m *MockClient) Stream(ctx context.Context, req client.Request, opts ...client.CallOption) (client.Stream, error) {
-	m.Lock()
-	defer m.Unlock()
-
-	// TODO: mock stream
-	return nil, nil
-}
-
-func (m *MockClient) Publish(ctx context.Context, p client.Message, opts ...client.PublishOption) error {
-	return nil
-}
-
-func (m *MockClient) String() string {
-	return "mock"
-}
-
-func NewClient(opts ...client.Option) *MockClient {
-	options := client.Options{
-		Context: context.TODO(),
-	}
-
-	for _, opt := range opts {
-		opt(&options)
-	}
-
-	r, ok := fromContext(options.Context)
-	if !ok {
-		r = make(map[string][]MockResponse)
-	}
-
-	return &MockClient{
-		Client:   client.DefaultClient,
-		Opts:     options,
-		Response: r,
-	}
-}

client/mock/mock_test.go

@@ -1,58 +0,0 @@
-package mock
-
-import (
-	"context"
-	"testing"
-
-	"github.com/micro/go-micro/errors"
-)
-
-func TestClient(t *testing.T) {
-	type TestResponse struct {
-		Param string
-	}
-
-	response := []MockResponse{
-		{Endpoint: "Foo.Bar", Response: map[string]interface{}{"foo": "bar"}},
-		{Endpoint: "Foo.Struct", Response: &TestResponse{Param: "aparam"}},
-		{Endpoint: "Foo.Fail", Error: errors.InternalServerError("go.mock", "failed")},
-		{Endpoint: "Foo.Func", Response: func() string { return "string" }},
-		{Endpoint: "Foo.FuncStruct", Response: func() *TestResponse { return &TestResponse{Param: "aparam"} }},
-		{Endpoint: "Foo.FuncWithReqBody", Response: func(req interface{}) string {
-			if req.(map[string]string)["foo"] == "bar" {
-				return "string"
-			}
-			return "wrong"
-		}},
-	}
-
-	c := NewClient(Response("go.mock", response))
-
-	for _, r := range response {
-		req := c.NewRequest("go.mock", r.Endpoint, map[string]string{"foo": "bar"})
-		var rsp interface{}
-
-		err := c.Call(context.TODO(), req, &rsp)
-
-		if err != r.Error {
-			t.Fatalf("Expecter error %v got %v", r.Error, err)
-		}
-
-		t.Log(rsp)
-		if r.Endpoint == "Foo.FuncWithReqBody" {
-			req := c.NewRequest("go.mock", r.Endpoint, map[string]string{"foo": "wrong"})
-			var rsp interface{}
-
-			err := c.Call(context.TODO(), req, &rsp)
-
-			if err != r.Error {
-				t.Fatalf("Expecter error %v got %v", r.Error, err)
-			}
-			if rsp.(string) != "wrong" {
-				t.Fatalf("Expecter response 'wrong' got %v", rsp)
-			}
-			t.Log(rsp)
-		}
-	}
-
-}

client/mock/options.go

@@ -1,17 +0,0 @@
-package mock
-
-import (
-	"github.com/micro/go-micro/client"
-)
-
-// Response sets the response methods for a service
-func Response(service string, response []MockResponse) client.Option {
-	return func(o *client.Options) {
-		r, ok := fromContext(o.Context)
-		if !ok {
-			r = make(map[string][]MockResponse)
-		}
-		r[service] = response
-		o.Context = newContext(o.Context, r)
-	}
-}

client/options.go

@@ -85,9 +85,11 @@ type RequestOptions struct {
 	Context context.Context
 }
 
-func newOptions(options ...Option) Options {
+func NewOptions(options ...Option) Options {
 	opts := Options{
-		Codecs: make(map[string]codec.NewCodec),
+		Context:     context.Background(),
+		ContentType: DefaultContentType,
+		Codecs:      make(map[string]codec.NewCodec),
 		CallOptions: CallOptions{
 			Backoff:        DefaultBackoff,
 			Retry:          DefaultRetry,
@@ -95,40 +97,18 @@ func newOptions(options ...Option) Options {
 			RequestTimeout: DefaultRequestTimeout,
 			DialTimeout:    transport.DefaultDialTimeout,
 		},
-		PoolSize: DefaultPoolSize,
-		PoolTTL:  DefaultPoolTTL,
+		PoolSize:  DefaultPoolSize,
+		PoolTTL:   DefaultPoolTTL,
+		Broker:    broker.DefaultBroker,
+		Selector:  selector.DefaultSelector,
+		Registry:  registry.DefaultRegistry,
+		Transport: transport.DefaultTransport,
 	}
 
 	for _, o := range options {
 		o(&opts)
 	}
 
-	if len(opts.ContentType) == 0 {
-		opts.ContentType = DefaultContentType
-	}
-
-	if opts.Broker == nil {
-		opts.Broker = broker.DefaultBroker
-	}
-
-	if opts.Registry == nil {
-		opts.Registry = registry.DefaultRegistry
-	}
-
-	if opts.Selector == nil {
-		opts.Selector = selector.NewSelector(
-			selector.Registry(opts.Registry),
-		)
-	}
-
-	if opts.Transport == nil {
-		opts.Transport = transport.DefaultTransport
-	}
-
-	if opts.Context == nil {
-		opts.Context = context.Background()
-	}
-
 	return opts
 }
 
@@ -160,7 +140,7 @@ func PoolSize(d int) Option {
 	}
 }
 
-// PoolSize sets the connection pool size
+// PoolTTL sets the connection pool ttl
 func PoolTTL(d time.Duration) Option {
 	return func(o *Options) {
 		o.PoolTTL = d
@@ -171,6 +151,8 @@ func PoolTTL(d time.Duration) Option {
 func Registry(r registry.Registry) Option {
 	return func(o *Options) {
 		o.Registry = r
+		// set in the selector
+		o.Selector.Init(selector.Registry(r))
 	}
 }
 

client/options_test.go

@@ -23,7 +23,7 @@ func TestCallOptions(t *testing.T) {
 		var cl Client
 
 		if d.set {
-			opts = newOptions(
+			opts = NewOptions(
 				Retries(d.retries),
 				RequestTimeout(d.rtimeout),
 				DialTimeout(d.dtimeout),
@@ -35,7 +35,7 @@ func TestCallOptions(t *testing.T) {
 				DialTimeout(d.dtimeout),
 			)
 		} else {
-			opts = newOptions()
+			opts = NewOptions()
 			cl = NewClient()
 		}
 

client/rpc_client.go

@@ -10,7 +10,6 @@ import (
 
 	"github.com/google/uuid"
 	"github.com/micro/go-micro/broker"
-	"github.com/micro/go-micro/client/pool"
 	"github.com/micro/go-micro/client/selector"
 	"github.com/micro/go-micro/codec"
 	raw "github.com/micro/go-micro/codec/bytes"
@@ -19,6 +18,7 @@ import (
 	"github.com/micro/go-micro/registry"
 	"github.com/micro/go-micro/transport"
 	"github.com/micro/go-micro/util/buf"
+	"github.com/micro/go-micro/util/pool"
 )
 
 type rpcClient struct {
@@ -29,7 +29,7 @@ type rpcClient struct {
 }
 
 func newRpcClient(opt ...Option) Client {
-	opts := newOptions(opt...)
+	opts := NewOptions(opt...)
 
 	p := pool.NewPool(
 		pool.Size(opts.PoolSize),

client/rpc_codec.go

@@ -186,32 +186,30 @@ func (c *rpcCodec) Write(m *codec.Message, body interface{}) error {
 
 	// if body is bytes Frame don't encode
 	if body != nil {
-		b, ok := body.(*raw.Frame)
-		if ok {
+		if b, ok := body.(*raw.Frame); ok {
 			// set body
 			m.Body = b.Data
-			body = nil
+		} else {
+			// write to codec
+			if err := c.codec.Write(m, body); err != nil {
+				return errors.InternalServerError("go.micro.client.codec", err.Error())
+			}
+			// set body
+			m.Body = c.buf.wbuf.Bytes()
 		}
 	}
 
-	if len(m.Body) == 0 {
-		// write to codec
-		if err := c.codec.Write(m, body); err != nil {
-			return errors.InternalServerError("go.micro.client.codec", err.Error())
-		}
-		// set body
-		m.Body = c.buf.wbuf.Bytes()
-	}
-
 	// create new transport message
 	msg := transport.Message{
 		Header: m.Header,
 		Body:   m.Body,
 	}
+
 	// send the request
 	if err := c.client.Send(&msg); err != nil {
 		return errors.InternalServerError("go.micro.client.transport", err.Error())
 	}
+
 	return nil
 }
 

client/rpc_stream.go

@@ -83,7 +83,10 @@ func (r *rpcStream) Recv(msg interface{}) error {
 
 	var resp codec.Message
 
-	if err := r.codec.ReadHeader(&resp, codec.Response); err != nil {
+	r.Unlock()
+	err := r.codec.ReadHeader(&resp, codec.Response)
+	r.Lock()
+	if err != nil {
 		if err == io.EOF && !r.isClosed() {
 			r.err = io.ErrUnexpectedEOF
 			return io.ErrUnexpectedEOF
@@ -102,11 +105,17 @@ func (r *rpcStream) Recv(msg interface{}) error {
 		} else {
 			r.err = io.EOF
 		}
-		if err := r.codec.ReadBody(nil); err != nil {
+		r.Unlock()
+		err = r.codec.ReadBody(nil)
+		r.Lock()
+		if err != nil {
 			r.err = err
 		}
 	default:
-		if err := r.codec.ReadBody(msg); err != nil {
+		r.Unlock()
+		err = r.codec.ReadBody(msg)
+		r.Lock()
+		if err != nil {
 			r.err = err
 		}
 	}
@@ -121,11 +130,15 @@ func (r *rpcStream) Error() error {
 }
 
 func (r *rpcStream) Close() error {
+	r.RLock()
+
 	select {
 	case <-r.closed:
+		r.RUnlock()
 		return nil
 	default:
 		close(r.closed)
+		r.RUnlock()
 
 		// send the end of stream message
 		if r.sendEOS {

client/selector/router/router.go

@@ -11,7 +11,7 @@ import (
 	"github.com/micro/go-micro/client/selector"
 	"github.com/micro/go-micro/registry"
 	"github.com/micro/go-micro/router"
-	pb "github.com/micro/go-micro/router/proto"
+	pb "github.com/micro/go-micro/router/service/proto"
 )
 
 type routerSelector struct {

codec/grpc/grpc.go

@@ -126,6 +126,10 @@ func (c *Codec) Write(m *codec.Message, b interface{}) error {
 		return err
 	}
 
+	if len(buf) == 0 {
+		return nil
+	}
+
 	return encode(0, buf, c.Conn)
 }
 

config/cmd/cmd.go

@@ -3,51 +3,58 @@ package cmd
 
 import (
 	"fmt"
-	"io"
 	"math/rand"
-	"os"
 	"strings"
 	"time"
 
-	"github.com/micro/cli"
+	"github.com/micro/go-micro/broker"
 	"github.com/micro/go-micro/client"
-	cgrpc "github.com/micro/go-micro/client/grpc"
-	cmucp "github.com/micro/go-micro/client/mucp"
+	"github.com/micro/go-micro/client/selector"
+	"github.com/micro/go-micro/debug/trace"
+	"github.com/micro/go-micro/registry"
+	"github.com/micro/go-micro/runtime"
 	"github.com/micro/go-micro/server"
-	sgrpc "github.com/micro/go-micro/server/grpc"
-	smucp "github.com/micro/go-micro/server/mucp"
+	"github.com/micro/go-micro/store"
+	"github.com/micro/go-micro/transport"
 	"github.com/micro/go-micro/util/log"
 
+	// clients
+	cgrpc "github.com/micro/go-micro/client/grpc"
+	cmucp "github.com/micro/go-micro/client/mucp"
+
+	// servers
+	"github.com/micro/cli/v2"
+	sgrpc "github.com/micro/go-micro/server/grpc"
+	smucp "github.com/micro/go-micro/server/mucp"
+
 	// brokers
-	"github.com/micro/go-micro/broker"
-	"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/etcd"
+	kreg "github.com/micro/go-micro/registry/kubernetes"
 	"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"
 	"github.com/micro/go-micro/client/selector/dns"
 	"github.com/micro/go-micro/client/selector/router"
 	"github.com/micro/go-micro/client/selector/static"
 
 	// transports
-	"github.com/micro/go-micro/transport"
-	tgrpc "github.com/micro/go-micro/transport/grpc"
 	thttp "github.com/micro/go-micro/transport/http"
 	tmem "github.com/micro/go-micro/transport/memory"
-	"github.com/micro/go-micro/transport/quic"
 
-	// runtimes
-	"github.com/micro/go-micro/runtime"
-	"github.com/micro/go-micro/runtime/kubernetes"
+	// stores
+	memStore "github.com/micro/go-micro/store/memory"
+	svcStore "github.com/micro/go-micro/store/service"
+
+	// tracers
+	// jTracer "github.com/micro/go-micro/debug/trace/jaeger"
+	memTracer "github.com/micro/go-micro/debug/trace/memory"
 )
 
 type Cmd interface {
@@ -71,160 +78,180 @@ var (
 	DefaultCmd = newCmd()
 
 	DefaultFlags = []cli.Flag{
-		cli.StringFlag{
-			Name:   "client",
-			EnvVar: "MICRO_CLIENT",
-			Usage:  "Client for go-micro; rpc",
+		&cli.StringFlag{
+			Name:    "client",
+			EnvVars: []string{"MICRO_CLIENT"},
+			Usage:   "Client for go-micro; rpc",
 		},
-		cli.StringFlag{
-			Name:   "client_request_timeout",
-			EnvVar: "MICRO_CLIENT_REQUEST_TIMEOUT",
-			Usage:  "Sets the client request timeout. e.g 500ms, 5s, 1m. Default: 5s",
+		&cli.StringFlag{
+			Name:    "client_request_timeout",
+			EnvVars: []string{"MICRO_CLIENT_REQUEST_TIMEOUT"},
+			Usage:   "Sets the client request timeout. e.g 500ms, 5s, 1m. Default: 5s",
 		},
-		cli.IntFlag{
-			Name:   "client_retries",
-			EnvVar: "MICRO_CLIENT_RETRIES",
-			Value:  client.DefaultRetries,
-			Usage:  "Sets the client retries. Default: 1",
+		&cli.IntFlag{
+			Name:    "client_retries",
+			EnvVars: []string{"MICRO_CLIENT_RETRIES"},
+			Value:   client.DefaultRetries,
+			Usage:   "Sets the client retries. Default: 1",
 		},
-		cli.IntFlag{
-			Name:   "client_pool_size",
-			EnvVar: "MICRO_CLIENT_POOL_SIZE",
-			Usage:  "Sets the client connection pool size. Default: 1",
+		&cli.IntFlag{
+			Name:    "client_pool_size",
+			EnvVars: []string{"MICRO_CLIENT_POOL_SIZE"},
+			Usage:   "Sets the client connection pool size. Default: 1",
 		},
-		cli.StringFlag{
-			Name:   "client_pool_ttl",
-			EnvVar: "MICRO_CLIENT_POOL_TTL",
-			Usage:  "Sets the client connection pool ttl. e.g 500ms, 5s, 1m. Default: 1m",
+		&cli.StringFlag{
+			Name:    "client_pool_ttl",
+			EnvVars: []string{"MICRO_CLIENT_POOL_TTL"},
+			Usage:   "Sets the client connection pool ttl. e.g 500ms, 5s, 1m. Default: 1m",
 		},
-		cli.IntFlag{
-			Name:   "register_ttl",
-			EnvVar: "MICRO_REGISTER_TTL",
-			Value:  60,
-			Usage:  "Register TTL in seconds",
+		&cli.IntFlag{
+			Name:    "register_ttl",
+			EnvVars: []string{"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.IntFlag{
+			Name:    "register_interval",
+			EnvVars: []string{"MICRO_REGISTER_INTERVAL"},
+			Value:   30,
+			Usage:   "Register interval in seconds",
 		},
-		cli.StringFlag{
-			Name:   "server",
-			EnvVar: "MICRO_SERVER",
-			Usage:  "Server for go-micro; rpc",
+		&cli.StringFlag{
+			Name:    "server",
+			EnvVars: []string{"MICRO_SERVER"},
+			Usage:   "Server for go-micro; rpc",
 		},
-		cli.StringFlag{
-			Name:   "server_name",
-			EnvVar: "MICRO_SERVER_NAME",
-			Usage:  "Name of the server. go.micro.srv.example",
+		&cli.StringFlag{
+			Name:    "server_name",
+			EnvVars: []string{"MICRO_SERVER_NAME"},
+			Usage:   "Name of the server. go.micro.srv.example",
 		},
-		cli.StringFlag{
-			Name:   "server_version",
-			EnvVar: "MICRO_SERVER_VERSION",
-			Usage:  "Version of the server. 1.1.0",
+		&cli.StringFlag{
+			Name:    "server_version",
+			EnvVars: []string{"MICRO_SERVER_VERSION"},
+			Usage:   "Version of the server. 1.1.0",
 		},
-		cli.StringFlag{
-			Name:   "server_id",
-			EnvVar: "MICRO_SERVER_ID",
-			Usage:  "Id of the server. Auto-generated if not specified",
+		&cli.StringFlag{
+			Name:    "server_id",
+			EnvVars: []string{"MICRO_SERVER_ID"},
+			Usage:   "Id of the server. Auto-generated if not specified",
 		},
-		cli.StringFlag{
-			Name:   "server_address",
-			EnvVar: "MICRO_SERVER_ADDRESS",
-			Usage:  "Bind address for the server. 127.0.0.1:8080",
+		&cli.StringFlag{
+			Name:    "server_address",
+			EnvVars: []string{"MICRO_SERVER_ADDRESS"},
+			Usage:   "Bind address for the server. 127.0.0.1:8080",
 		},
-		cli.StringFlag{
-			Name:   "server_advertise",
-			EnvVar: "MICRO_SERVER_ADVERTISE",
-			Usage:  "Used instead of the server_address when registering with discovery. 127.0.0.1:8080",
+		&cli.StringFlag{
+			Name:    "server_advertise",
+			EnvVars: []string{"MICRO_SERVER_ADVERTISE"},
+			Usage:   "Used instead of the server_address when registering with discovery. 127.0.0.1:8080",
 		},
-		cli.StringSliceFlag{
-			Name:   "server_metadata",
-			EnvVar: "MICRO_SERVER_METADATA",
-			Value:  &cli.StringSlice{},
-			Usage:  "A list of key-value pairs defining metadata. version=1.0.0",
+		&cli.StringSliceFlag{
+			Name:    "server_metadata",
+			EnvVars: []string{"MICRO_SERVER_METADATA"},
+			Value:   &cli.StringSlice{},
+			Usage:   "A list of key-value pairs defining metadata. version=1.0.0",
 		},
-		cli.StringFlag{
-			Name:   "broker",
-			EnvVar: "MICRO_BROKER",
-			Usage:  "Broker for pub/sub. http, nats, rabbitmq",
+		&cli.StringFlag{
+			Name:    "broker",
+			EnvVars: []string{"MICRO_BROKER"},
+			Usage:   "Broker for pub/sub. http, nats, rabbitmq",
 		},
-		cli.StringFlag{
-			Name:   "broker_address",
-			EnvVar: "MICRO_BROKER_ADDRESS",
-			Usage:  "Comma-separated list of broker addresses",
+		&cli.StringFlag{
+			Name:    "broker_address",
+			EnvVars: []string{"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:    "profile",
+			Usage:   "Debug profiler for cpu and memory stats",
+			EnvVars: []string{"MICRO_DEBUG_PROFILE"},
 		},
-		cli.StringFlag{
-			Name:   "registry",
-			EnvVar: "MICRO_REGISTRY",
-			Usage:  "Registry for discovery. etcd, mdns",
+		&cli.StringFlag{
+			Name:    "registry",
+			EnvVars: []string{"MICRO_REGISTRY"},
+			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:    "registry_address",
+			EnvVars: []string{"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:    "runtime",
+			Usage:   "Runtime for building and running services e.g local, kubernetes",
+			EnvVars: []string{"MICRO_RUNTIME"},
+			Value:   "local",
 		},
-		cli.StringFlag{
-			Name:   "selector",
-			EnvVar: "MICRO_SELECTOR",
-			Usage:  "Selector used to pick nodes for querying",
+		&cli.StringFlag{
+			Name:    "selector",
+			EnvVars: []string{"MICRO_SELECTOR"},
+			Usage:   "Selector used to pick nodes for querying",
 		},
-		cli.StringFlag{
-			Name:   "transport",
-			EnvVar: "MICRO_TRANSPORT",
-			Usage:  "Transport mechanism used; http",
+		&cli.StringFlag{
+			Name:    "store",
+			EnvVars: []string{"MICRO_STORE"},
+			Usage:   "Store used for key-value storage",
 		},
-		cli.StringFlag{
-			Name:   "transport_address",
-			EnvVar: "MICRO_TRANSPORT_ADDRESS",
-			Usage:  "Comma-separated list of transport addresses",
+		&cli.StringFlag{
+			Name:    "store_address",
+			EnvVars: []string{"MICRO_STORE_ADDRESS"},
+			Usage:   "Comma-separated list of store addresses",
+		},
+		&cli.StringFlag{
+			Name:    "store_namespace",
+			EnvVars: []string{"MICRO_STORE_NAMESPACE"},
+			Usage:   "Namespace for store data",
+		},
+		&cli.StringFlag{
+			Name:    "transport",
+			EnvVars: []string{"MICRO_TRANSPORT"},
+			Usage:   "Transport mechanism used; http",
+		},
+		&cli.StringFlag{
+			Name:    "transport_address",
+			EnvVars: []string{"MICRO_TRANSPORT_ADDRESS"},
+			Usage:   "Comma-separated list of transport addresses",
+		},
+		&cli.StringFlag{
+			Name:    "tracer",
+			EnvVars: []string{"MICRO_TRACER"},
+			Usage:   "Tracer for distributed tracing, e.g. memory, jaeger",
+			Value:   "memory",
+		},
+		&cli.StringFlag{
+			Name:    "tracer_address",
+			EnvVars: []string{"MICRO_TRACER_ADDRESS"},
+			Usage:   "Comma-separated list of tracer addresses",
 		},
 	}
 
 	DefaultBrokers = map[string]func(...broker.Option) broker.Broker{
-		"go.micro.broker": brokerSrv.NewBroker,
-		"service":         brokerSrv.NewBroker,
-		"http":            http.NewBroker,
-		"memory":          memory.NewBroker,
-		"nats":            nats.NewBroker,
+		"service": brokerSrv.NewBroker,
+		"memory":  memory.NewBroker,
+		"nats":    nats.NewBroker,
 	}
 
 	DefaultClients = map[string]func(...client.Option) client.Client{
-		"rpc":  client.NewClient,
 		"mucp": cmucp.NewClient,
 		"grpc": cgrpc.NewClient,
 	}
 
 	DefaultRegistries = map[string]func(...registry.Option) registry.Registry{
-		"go.micro.registry": regSrv.NewRegistry,
-		"service":           regSrv.NewRegistry,
-		"etcd":              etcd.NewRegistry,
-		"mdns":              mdns.NewRegistry,
-		"memory":            rmem.NewRegistry,
+		"service":    regSrv.NewRegistry,
+		"etcd":       etcd.NewRegistry,
+		"mdns":       mdns.NewRegistry,
+		"memory":     rmem.NewRegistry,
+		"kubernetes": kreg.NewRegistry,
 	}
 
 	DefaultSelectors = map[string]func(...selector.Option) selector.Selector{
-		"default": selector.NewSelector,
-		"dns":     dns.NewSelector,
-		"cache":   selector.NewSelector,
-		"router":  router.NewSelector,
-		"static":  static.NewSelector,
+		"dns":    dns.NewSelector,
+		"router": router.NewSelector,
+		"static": static.NewSelector,
 	}
 
 	DefaultServers = map[string]func(...server.Option) server.Server{
-		"rpc":  server.NewServer,
 		"mucp": smucp.NewServer,
 		"grpc": sgrpc.NewServer,
 	}
@@ -232,32 +259,35 @@ var (
 	DefaultTransports = map[string]func(...transport.Option) transport.Transport{
 		"memory": tmem.NewTransport,
 		"http":   thttp.NewTransport,
-		"grpc":   tgrpc.NewTransport,
-		"quic":   quic.NewTransport,
 	}
 
 	DefaultRuntimes = map[string]func(...runtime.Option) runtime.Runtime{
-		"local":      runtime.NewRuntime,
-		"kubernetes": kubernetes.NewRuntime,
+		"local": runtime.NewRuntime,
+	}
+
+	DefaultStores = map[string]func(...store.Option) store.Store{
+		"memory":  memStore.NewStore,
+		"service": svcStore.NewStore,
+	}
+
+	DefaultTracers = map[string]func(...trace.Option) trace.Tracer{
+		"memory": memTracer.NewTracer,
+		// "jaeger": jTracer.NewTracer,
 	}
 
 	// used for default selection as the fall back
-	defaultClient    = "rpc"
-	defaultServer    = "rpc"
-	defaultBroker    = "http"
+	defaultClient    = "grpc"
+	defaultServer    = "grpc"
+	defaultBroker    = "eats"
 	defaultRegistry  = "mdns"
 	defaultSelector  = "registry"
 	defaultTransport = "http"
 	defaultRuntime   = "local"
+	defaultStore     = "memory"
 )
 
 func init() {
 	rand.Seed(time.Now().Unix())
-	help := cli.HelpPrinter
-	cli.HelpPrinter = func(writer io.Writer, templ string, data interface{}) {
-		help(writer, templ, data)
-		os.Exit(0)
-	}
 }
 
 func newCmd(opts ...Option) Cmd {
@@ -269,6 +299,8 @@ func newCmd(opts ...Option) Cmd {
 		Selector:  &selector.DefaultSelector,
 		Transport: &transport.DefaultTransport,
 		Runtime:   &runtime.DefaultRuntime,
+		Store:     &store.DefaultStore,
+		Tracer:    &trace.DefaultTracer,
 
 		Brokers:    DefaultBrokers,
 		Clients:    DefaultClients,
@@ -277,6 +309,8 @@ func newCmd(opts ...Option) Cmd {
 		Servers:    DefaultServers,
 		Transports: DefaultTransports,
 		Runtimes:   DefaultRuntimes,
+		Stores:     DefaultStores,
+		Tracers:    DefaultTracers,
 	}
 
 	for _, o := range opts {
@@ -295,7 +329,9 @@ func newCmd(opts ...Option) Cmd {
 	cmd.app.Usage = cmd.opts.Description
 	cmd.app.Before = cmd.Before
 	cmd.app.Flags = DefaultFlags
-	cmd.app.Action = func(c *cli.Context) {}
+	cmd.app.Action = func(c *cli.Context) error {
+		return nil
+	}
 
 	if len(options.Version) == 0 {
 		cmd.app.HideVersion = true
@@ -317,6 +353,16 @@ func (c *cmd) Before(ctx *cli.Context) error {
 	var serverOpts []server.Option
 	var clientOpts []client.Option
 
+	// Set the store
+	if name := ctx.String("store"); len(name) > 0 {
+		s, ok := c.opts.Stores[name]
+		if !ok {
+			return fmt.Errorf("Unsupported store: %s", name)
+		}
+
+		*c.opts.Store = s()
+	}
+
 	// Set the runtime
 	if name := ctx.String("runtime"); len(name) > 0 {
 		r, ok := c.opts.Runtimes[name]
@@ -327,6 +373,16 @@ func (c *cmd) Before(ctx *cli.Context) error {
 		*c.opts.Runtime = r()
 	}
 
+	// Set the tracer
+	if name := ctx.String("tracer"); len(name) > 0 {
+		r, ok := c.opts.Tracers[name]
+		if !ok {
+			return fmt.Errorf("Unsupported tracer: %s", name)
+		}
+
+		*c.opts.Tracer = r()
+	}
+
 	// Set the client
 	if name := ctx.String("client"); len(name) > 0 {
 		// only change if we have the client and type differs
@@ -436,6 +492,18 @@ func (c *cmd) Before(ctx *cli.Context) error {
 		}
 	}
 
+	if len(ctx.String("store_address")) > 0 {
+		if err := (*c.opts.Store).Init(store.Nodes(strings.Split(ctx.String("store_address"), ",")...)); err != nil {
+			log.Fatalf("Error configuring store: %v", err)
+		}
+	}
+
+	if len(ctx.String("store_namespace")) > 0 {
+		if err := (*c.opts.Store).Init(store.Namespace(ctx.String("store_address"))); err != nil {
+			log.Fatalf("Error configuring store: %v", err)
+		}
+	}
+
 	if len(ctx.String("server_name")) > 0 {
 		serverOpts = append(serverOpts, server.Name(ctx.String("server_name")))
 	}
@@ -456,11 +524,11 @@ 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.Int("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.Int("register_interval")); val >= 0 {
 		serverOpts = append(serverOpts, server.RegisterInterval(val*time.Second))
 	}
 
@@ -511,8 +579,12 @@ func (c *cmd) Init(opts ...Option) error {
 	for _, o := range opts {
 		o(&c.opts)
 	}
-	c.app.Name = c.opts.Name
-	c.app.Version = c.opts.Version
+	if len(c.opts.Name) > 0 {
+		c.app.Name = c.opts.Name
+	}
+	if len(c.opts.Version) > 0 {
+		c.app.Version = c.opts.Version
+	}
 	c.app.HideVersion = len(c.opts.Version) == 0
 	c.app.Usage = c.opts.Description
 	c.app.RunAndExitOnError()

config/cmd/options.go

@@ -6,9 +6,11 @@ import (
 	"github.com/micro/go-micro/broker"
 	"github.com/micro/go-micro/client"
 	"github.com/micro/go-micro/client/selector"
+	"github.com/micro/go-micro/debug/trace"
 	"github.com/micro/go-micro/registry"
 	"github.com/micro/go-micro/runtime"
 	"github.com/micro/go-micro/server"
+	"github.com/micro/go-micro/store"
 	"github.com/micro/go-micro/transport"
 )
 
@@ -26,6 +28,8 @@ type Options struct {
 	Client    *client.Client
 	Server    *server.Server
 	Runtime   *runtime.Runtime
+	Store     *store.Store
+	Tracer    *trace.Tracer
 
 	Brokers    map[string]func(...broker.Option) broker.Broker
 	Clients    map[string]func(...client.Option) client.Client
@@ -34,6 +38,8 @@ type Options struct {
 	Servers    map[string]func(...server.Option) server.Server
 	Transports map[string]func(...transport.Option) transport.Transport
 	Runtimes   map[string]func(...runtime.Option) runtime.Runtime
+	Stores     map[string]func(...store.Option) store.Store
+	Tracers    map[string]func(...trace.Option) trace.Tracer
 
 	// Other options for implementations of the interface
 	// can be stored in a context
@@ -97,6 +103,12 @@ func Server(s *server.Server) Option {
 	}
 }
 
+func Tracer(t *trace.Tracer) Option {
+	return func(o *Options) {
+		o.Tracer = t
+	}
+}
+
 // New broker func
 func NewBroker(name string, b func(...broker.Option) broker.Broker) Option {
 	return func(o *Options) {
@@ -145,3 +157,10 @@ func NewRuntime(name string, r func(...runtime.Option) runtime.Runtime) Option {
 		o.Runtimes[name] = r
 	}
 }
+
+// New tracer func
+func NewTracer(name string, t func(...trace.Option) trace.Tracer) Option {
+	return func(o *Options) {
+		o.Tracers[name] = t
+	}
+}

config/config.go

@@ -43,11 +43,11 @@ type Option func(o *Options)
 
 var (
 	// Default Config Manager
-	DefaultConfig = NewConfig()
+	DefaultConfig, _ = NewConfig()
 )
 
 // NewConfig returns new config
-func NewConfig(opts ...Option) Config {
+func NewConfig(opts ...Option) (Config, error) {
 	return newConfig(opts...)
 }
 

config/default.go

@@ -30,7 +30,7 @@ type watcher struct {
 	value reader.Value
 }
 
-func newConfig(opts ...Option) Config {
+func newConfig(opts ...Option) (Config, error) {
 	options := Options{
 		Loader: memory.NewLoader(),
 		Reader: json.NewReader(),
@@ -40,9 +40,18 @@ func newConfig(opts ...Option) Config {
 		o(&options)
 	}
 
-	options.Loader.Load(options.Source...)
-	snap, _ := options.Loader.Snapshot()
-	vals, _ := options.Reader.Values(snap.ChangeSet)
+	if err := options.Loader.Load(options.Source...); err != nil {
+		return nil, err
+	}
+
+	snap, err := options.Loader.Snapshot()
+	if err != nil {
+		return nil, err
+	}
+	vals, err := options.Reader.Values(snap.ChangeSet)
+	if err != nil {
+		return nil, err
+	}
 
 	c := &config{
 		exit: make(chan bool),
@@ -53,7 +62,7 @@ func newConfig(opts ...Option) Config {
 
 	go c.run()
 
-	return c
+	return c, nil
 }
 
 func (c *config) run() {
@@ -172,6 +181,28 @@ func (c *config) Get(path ...string) reader.Value {
 	return newValue()
 }
 
+func (c *config) Set(val interface{}, path ...string) {
+	c.Lock()
+	defer c.Unlock()
+
+	if c.vals != nil {
+		c.vals.Set(val, path...)
+	}
+
+	return
+}
+
+func (c *config) Del(path ...string) {
+	c.Lock()
+	defer c.Unlock()
+
+	if c.vals != nil {
+		c.vals.Del(path...)
+	}
+
+	return
+}
+
 func (c *config) Bytes() []byte {
 	c.RLock()
 	defer c.RUnlock()

config/default_test.go

@@ -55,7 +55,10 @@ func TestConfigLoadWithGoodFile(t *testing.T) {
 	}()
 
 	// Create new config
-	conf := NewConfig()
+	conf, err := NewConfig()
+	if err != nil {
+		t.Fatalf("Expected no error but got %v", err)
+	}
 	// Load file source
 	if err := conf.Load(file.NewSource(
 		file.WithPath(path),
@@ -73,9 +76,12 @@ func TestConfigLoadWithInvalidFile(t *testing.T) {
 	}()
 
 	// Create new config
-	conf := NewConfig()
+	conf, err := NewConfig()
+	if err != nil {
+		t.Fatalf("Expected no error but got %v", err)
+	}
 	// Load file source
-	err := conf.Load(file.NewSource(
+	err = conf.Load(file.NewSource(
 		file.WithPath(path),
 		file.WithPath("/i/do/not/exists.json"),
 	))
@@ -105,13 +111,18 @@ func TestConfigMerge(t *testing.T) {
 	}()
 	os.Setenv("AMQP_HOST", "rabbit.testing.com")
 
-	conf := NewConfig()
-	conf.Load(
+	conf, err := NewConfig()
+	if err != nil {
+		t.Fatalf("Expected no error but got %v", err)
+	}
+	if err := conf.Load(
 		file.NewSource(
 			file.WithPath(path),
 		),
 		env.NewSource(),
-	)
+	); err != nil {
+		t.Fatalf("Expected no error but got %v", err)
+	}
 
 	actualHost := conf.Get("amqp", "host").String("backup")
 	if actualHost != "rabbit.testing.com" {

config/reader/json/values.go

@@ -30,13 +30,6 @@ func newValues(ch *source.ChangeSet) (reader.Values, error) {
 	return &jsonValues{ch, sj}, nil
 }
 
-func newValue(s *simple.Json) reader.Value {
-	if s == nil {
-		s = simple.New()
-	}
-	return &jsonValue{s}
-}
-
 func (j *jsonValues) Get(path ...string) reader.Value {
 	return &jsonValue{j.sj.GetPath(path...)}
 }

config/reader/reader.go

@@ -18,6 +18,8 @@ type Reader interface {
 type Values interface {
 	Bytes() []byte
 	Get(path ...string) Value
+	Set(val interface{}, path ...string)
+	Del(path ...string)
 	Map() map[string]interface{}
 	Scan(v interface{}) error
 }

config/source/cli/cli.go

@@ -8,7 +8,7 @@ import (
 	"time"
 
 	"github.com/imdario/mergo"
-	"github.com/micro/cli"
+	"github.com/micro/cli/v2"
 	"github.com/micro/go-micro/config/cmd"
 	"github.com/micro/go-micro/config/source"
 )
@@ -21,11 +21,6 @@ type cliSource struct {
 func (c *cliSource) Read() (*source.ChangeSet, error) {
 	var changes map[string]interface{}
 
-	for _, name := range c.ctx.GlobalFlagNames() {
-		tmp := toEntry(name, c.ctx.GlobalGeneric(name))
-		mergo.Map(&changes, tmp) // need to sort error handling
-	}
-
 	for _, name := range c.ctx.FlagNames() {
 		tmp := toEntry(name, c.ctx.Generic(name))
 		mergo.Map(&changes, tmp) // need to sort error handling
@@ -78,6 +73,11 @@ func (c *cliSource) Watch() (source.Watcher, error) {
 	return source.NewNoopWatcher()
 }
 
+// Write is unsupported
+func (c *cliSource) Write(cs *source.ChangeSet) error {
+	return nil
+}
+
 func (c *cliSource) String() string {
 	return "cli"
 }

config/source/cli/cli_test.go

@@ -5,7 +5,7 @@ import (
 	"os"
 	"testing"
 
-	"github.com/micro/cli"
+	"github.com/micro/cli/v2"
 	"github.com/micro/go-micro/config/cmd"
 	"github.com/micro/go-micro/config/source"
 )
@@ -17,14 +17,15 @@ func test(t *testing.T, withContext bool) {
 	app := cmd.App()
 	app.Name = "testapp"
 	app.Flags = []cli.Flag{
-		cli.StringFlag{Name: "db-host"},
+		&cli.StringFlag{Name: "db-host"},
 	}
 
 	// with context
 	if withContext {
 		// set action
-		app.Action = func(c *cli.Context) {
+		app.Action = func(c *cli.Context) error {
 			src = WithContext(c)
+			return nil
 		}
 
 		// run app

config/source/cli/options.go

@@ -3,7 +3,7 @@ package cli
 import (
 	"context"
 
-	"github.com/micro/cli"
+	"github.com/micro/cli/v2"
 	"github.com/micro/go-micro/config/source"
 )
 

config/source/cli/util.go

@@ -5,7 +5,7 @@ import (
 	"flag"
 	"strings"
 
-	"github.com/micro/cli"
+	"github.com/micro/cli/v2"
 )
 
 func copyFlag(name string, ff *flag.Flag, set *flag.FlagSet) {
@@ -22,7 +22,7 @@ func normalizeFlags(flags []cli.Flag, set *flag.FlagSet) error {
 		visited[f.Name] = true
 	})
 	for _, f := range flags {
-		parts := strings.Split(f.GetName(), ",")
+		parts := f.Names()
 		if len(parts) == 1 {
 			continue
 		}

config/source/env/env.go

@@ -105,6 +105,10 @@ func (e *env) Watch() (source.Watcher, error) {
 	return newWatcher()
 }
 
+func (e *env) Write(cs *source.ChangeSet) error {
+	return nil
+}
+
 func (e *env) String() string {
 	return "env"
 }

config/source/etcd/etcd.go

@@ -76,6 +76,10 @@ func (c *etcd) Watch() (source.Watcher, error) {
 	return newWatcher(c.prefix, c.stripPrefix, c.client.Watcher, cs, c.opts)
 }
 
+func (c *etcd) Write(cs *source.ChangeSet) error {
+	return nil
+}
+
 func NewSource(opts ...source.Option) source.Source {
 	options := source.NewOptions(opts...)
 

config/source/file/file.go

@@ -54,6 +54,10 @@ func (f *file) Watch() (source.Watcher, error) {
 	return newWatcher(f)
 }
 
+func (f *file) Write(cs *source.ChangeSet) error {
+	return nil
+}
+
 func NewSource(opts ...source.Option) source.Source {
 	options := source.NewOptions(opts...)
 	path := DefaultPath

config/source/flag/flag.go

@@ -77,6 +77,10 @@ func (fs *flagsrc) Watch() (source.Watcher, error) {
 	return source.NewNoopWatcher()
 }
 
+func (fs *flagsrc) Write(cs *source.ChangeSet) error {
+	return nil
+}
+
 func (fs *flagsrc) String() string {
 	return "flag"
 }

config/source/memory/memory.go

@@ -41,6 +41,10 @@ func (s *memory) Watch() (source.Watcher, error) {
 	return w, nil
 }
 
+func (m *memory) Write(cs *source.ChangeSet) error {
+	return nil
+}
+
 // Update allows manual updates of the config data.
 func (s *memory) Update(c *source.ChangeSet) {
 	// don't process nil

config/source/service/options.go

@@ -0,0 +1,38 @@
+package service
+
+import (
+	"context"
+
+	"github.com/micro/go-micro/config/source"
+)
+
+type serviceNameKey struct{}
+type keyKey struct{}
+type pathKey struct{}
+
+func ServiceName(name string) source.Option {
+	return func(o *source.Options) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, serviceNameKey{}, name)
+	}
+}
+
+func Key(key string) source.Option {
+	return func(o *source.Options) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, keyKey{}, key)
+	}
+}
+
+func Path(path string) source.Option {
+	return func(o *source.Options) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, pathKey{}, path)
+	}
+}

config/source/service/proto/service.pb.go

@@ -0,0 +1,660 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// source: go-micro/config/source/service/proto/service.proto
+
+package service
+
+import (
+	fmt "fmt"
+	proto "github.com/golang/protobuf/proto"
+	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 ChangeSet struct {
+	Data                 []byte   `protobuf:"bytes,1,opt,name=data,proto3" json:"data,omitempty"`
+	Checksum             string   `protobuf:"bytes,2,opt,name=checksum,proto3" json:"checksum,omitempty"`
+	Format               string   `protobuf:"bytes,3,opt,name=format,proto3" json:"format,omitempty"`
+	Source               string   `protobuf:"bytes,4,opt,name=source,proto3" json:"source,omitempty"`
+	Timestamp            int64    `protobuf:"varint,5,opt,name=timestamp,proto3" json:"timestamp,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *ChangeSet) Reset()         { *m = ChangeSet{} }
+func (m *ChangeSet) String() string { return proto.CompactTextString(m) }
+func (*ChangeSet) ProtoMessage()    {}
+func (*ChangeSet) Descriptor() ([]byte, []int) {
+	return fileDescriptor_05971a9aaecb0484, []int{0}
+}
+
+func (m *ChangeSet) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_ChangeSet.Unmarshal(m, b)
+}
+func (m *ChangeSet) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_ChangeSet.Marshal(b, m, deterministic)
+}
+func (m *ChangeSet) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_ChangeSet.Merge(m, src)
+}
+func (m *ChangeSet) XXX_Size() int {
+	return xxx_messageInfo_ChangeSet.Size(m)
+}
+func (m *ChangeSet) XXX_DiscardUnknown() {
+	xxx_messageInfo_ChangeSet.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_ChangeSet proto.InternalMessageInfo
+
+func (m *ChangeSet) GetData() []byte {
+	if m != nil {
+		return m.Data
+	}
+	return nil
+}
+
+func (m *ChangeSet) GetChecksum() string {
+	if m != nil {
+		return m.Checksum
+	}
+	return ""
+}
+
+func (m *ChangeSet) GetFormat() string {
+	if m != nil {
+		return m.Format
+	}
+	return ""
+}
+
+func (m *ChangeSet) GetSource() string {
+	if m != nil {
+		return m.Source
+	}
+	return ""
+}
+
+func (m *ChangeSet) GetTimestamp() int64 {
+	if m != nil {
+		return m.Timestamp
+	}
+	return 0
+}
+
+type Change struct {
+	Key                  string     `protobuf:"bytes,1,opt,name=key,proto3" json:"key,omitempty"`
+	Path                 string     `protobuf:"bytes,2,opt,name=path,proto3" json:"path,omitempty"`
+	ChangeSet            *ChangeSet `protobuf:"bytes,3,opt,name=changeSet,proto3" json:"changeSet,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}   `json:"-"`
+	XXX_unrecognized     []byte     `json:"-"`
+	XXX_sizecache        int32      `json:"-"`
+}
+
+func (m *Change) Reset()         { *m = Change{} }
+func (m *Change) String() string { return proto.CompactTextString(m) }
+func (*Change) ProtoMessage()    {}
+func (*Change) Descriptor() ([]byte, []int) {
+	return fileDescriptor_05971a9aaecb0484, []int{1}
+}
+
+func (m *Change) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_Change.Unmarshal(m, b)
+}
+func (m *Change) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_Change.Marshal(b, m, deterministic)
+}
+func (m *Change) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_Change.Merge(m, src)
+}
+func (m *Change) XXX_Size() int {
+	return xxx_messageInfo_Change.Size(m)
+}
+func (m *Change) XXX_DiscardUnknown() {
+	xxx_messageInfo_Change.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_Change proto.InternalMessageInfo
+
+func (m *Change) GetKey() string {
+	if m != nil {
+		return m.Key
+	}
+	return ""
+}
+
+func (m *Change) GetPath() string {
+	if m != nil {
+		return m.Path
+	}
+	return ""
+}
+
+func (m *Change) GetChangeSet() *ChangeSet {
+	if m != nil {
+		return m.ChangeSet
+	}
+	return nil
+}
+
+type CreateRequest struct {
+	Change               *Change  `protobuf:"bytes,1,opt,name=change,proto3" json:"change,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *CreateRequest) Reset()         { *m = CreateRequest{} }
+func (m *CreateRequest) String() string { return proto.CompactTextString(m) }
+func (*CreateRequest) ProtoMessage()    {}
+func (*CreateRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_05971a9aaecb0484, []int{2}
+}
+
+func (m *CreateRequest) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_CreateRequest.Unmarshal(m, b)
+}
+func (m *CreateRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_CreateRequest.Marshal(b, m, deterministic)
+}
+func (m *CreateRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_CreateRequest.Merge(m, src)
+}
+func (m *CreateRequest) XXX_Size() int {
+	return xxx_messageInfo_CreateRequest.Size(m)
+}
+func (m *CreateRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_CreateRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_CreateRequest proto.InternalMessageInfo
+
+func (m *CreateRequest) GetChange() *Change {
+	if m != nil {
+		return m.Change
+	}
+	return nil
+}
+
+type CreateResponse struct {
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *CreateResponse) Reset()         { *m = CreateResponse{} }
+func (m *CreateResponse) String() string { return proto.CompactTextString(m) }
+func (*CreateResponse) ProtoMessage()    {}
+func (*CreateResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_05971a9aaecb0484, []int{3}
+}
+
+func (m *CreateResponse) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_CreateResponse.Unmarshal(m, b)
+}
+func (m *CreateResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_CreateResponse.Marshal(b, m, deterministic)
+}
+func (m *CreateResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_CreateResponse.Merge(m, src)
+}
+func (m *CreateResponse) XXX_Size() int {
+	return xxx_messageInfo_CreateResponse.Size(m)
+}
+func (m *CreateResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_CreateResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_CreateResponse proto.InternalMessageInfo
+
+type UpdateRequest struct {
+	Change               *Change  `protobuf:"bytes,1,opt,name=change,proto3" json:"change,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *UpdateRequest) Reset()         { *m = UpdateRequest{} }
+func (m *UpdateRequest) String() string { return proto.CompactTextString(m) }
+func (*UpdateRequest) ProtoMessage()    {}
+func (*UpdateRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_05971a9aaecb0484, []int{4}
+}
+
+func (m *UpdateRequest) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_UpdateRequest.Unmarshal(m, b)
+}
+func (m *UpdateRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_UpdateRequest.Marshal(b, m, deterministic)
+}
+func (m *UpdateRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_UpdateRequest.Merge(m, src)
+}
+func (m *UpdateRequest) XXX_Size() int {
+	return xxx_messageInfo_UpdateRequest.Size(m)
+}
+func (m *UpdateRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_UpdateRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_UpdateRequest proto.InternalMessageInfo
+
+func (m *UpdateRequest) GetChange() *Change {
+	if m != nil {
+		return m.Change
+	}
+	return nil
+}
+
+type UpdateResponse struct {
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *UpdateResponse) Reset()         { *m = UpdateResponse{} }
+func (m *UpdateResponse) String() string { return proto.CompactTextString(m) }
+func (*UpdateResponse) ProtoMessage()    {}
+func (*UpdateResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_05971a9aaecb0484, []int{5}
+}
+
+func (m *UpdateResponse) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_UpdateResponse.Unmarshal(m, b)
+}
+func (m *UpdateResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_UpdateResponse.Marshal(b, m, deterministic)
+}
+func (m *UpdateResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_UpdateResponse.Merge(m, src)
+}
+func (m *UpdateResponse) XXX_Size() int {
+	return xxx_messageInfo_UpdateResponse.Size(m)
+}
+func (m *UpdateResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_UpdateResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_UpdateResponse proto.InternalMessageInfo
+
+type DeleteRequest struct {
+	Change               *Change  `protobuf:"bytes,1,opt,name=change,proto3" json:"change,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *DeleteRequest) Reset()         { *m = DeleteRequest{} }
+func (m *DeleteRequest) String() string { return proto.CompactTextString(m) }
+func (*DeleteRequest) ProtoMessage()    {}
+func (*DeleteRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_05971a9aaecb0484, []int{6}
+}
+
+func (m *DeleteRequest) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_DeleteRequest.Unmarshal(m, b)
+}
+func (m *DeleteRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_DeleteRequest.Marshal(b, m, deterministic)
+}
+func (m *DeleteRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_DeleteRequest.Merge(m, src)
+}
+func (m *DeleteRequest) XXX_Size() int {
+	return xxx_messageInfo_DeleteRequest.Size(m)
+}
+func (m *DeleteRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_DeleteRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_DeleteRequest proto.InternalMessageInfo
+
+func (m *DeleteRequest) GetChange() *Change {
+	if m != nil {
+		return m.Change
+	}
+	return nil
+}
+
+type DeleteResponse struct {
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *DeleteResponse) Reset()         { *m = DeleteResponse{} }
+func (m *DeleteResponse) String() string { return proto.CompactTextString(m) }
+func (*DeleteResponse) ProtoMessage()    {}
+func (*DeleteResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_05971a9aaecb0484, []int{7}
+}
+
+func (m *DeleteResponse) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_DeleteResponse.Unmarshal(m, b)
+}
+func (m *DeleteResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_DeleteResponse.Marshal(b, m, deterministic)
+}
+func (m *DeleteResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_DeleteResponse.Merge(m, src)
+}
+func (m *DeleteResponse) XXX_Size() int {
+	return xxx_messageInfo_DeleteResponse.Size(m)
+}
+func (m *DeleteResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_DeleteResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_DeleteResponse proto.InternalMessageInfo
+
+type ListRequest struct {
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *ListRequest) Reset()         { *m = ListRequest{} }
+func (m *ListRequest) String() string { return proto.CompactTextString(m) }
+func (*ListRequest) ProtoMessage()    {}
+func (*ListRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_05971a9aaecb0484, []int{8}
+}
+
+func (m *ListRequest) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_ListRequest.Unmarshal(m, b)
+}
+func (m *ListRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_ListRequest.Marshal(b, m, deterministic)
+}
+func (m *ListRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_ListRequest.Merge(m, src)
+}
+func (m *ListRequest) XXX_Size() int {
+	return xxx_messageInfo_ListRequest.Size(m)
+}
+func (m *ListRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_ListRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_ListRequest proto.InternalMessageInfo
+
+type ListResponse struct {
+	Values               []*Change `protobuf:"bytes,1,rep,name=values,proto3" json:"values,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}  `json:"-"`
+	XXX_unrecognized     []byte    `json:"-"`
+	XXX_sizecache        int32     `json:"-"`
+}
+
+func (m *ListResponse) Reset()         { *m = ListResponse{} }
+func (m *ListResponse) String() string { return proto.CompactTextString(m) }
+func (*ListResponse) ProtoMessage()    {}
+func (*ListResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_05971a9aaecb0484, []int{9}
+}
+
+func (m *ListResponse) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_ListResponse.Unmarshal(m, b)
+}
+func (m *ListResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_ListResponse.Marshal(b, m, deterministic)
+}
+func (m *ListResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_ListResponse.Merge(m, src)
+}
+func (m *ListResponse) XXX_Size() int {
+	return xxx_messageInfo_ListResponse.Size(m)
+}
+func (m *ListResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_ListResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_ListResponse proto.InternalMessageInfo
+
+func (m *ListResponse) GetValues() []*Change {
+	if m != nil {
+		return m.Values
+	}
+	return nil
+}
+
+type ReadRequest struct {
+	Key                  string   `protobuf:"bytes,1,opt,name=key,proto3" json:"key,omitempty"`
+	Path                 string   `protobuf:"bytes,2,opt,name=path,proto3" json:"path,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *ReadRequest) Reset()         { *m = ReadRequest{} }
+func (m *ReadRequest) String() string { return proto.CompactTextString(m) }
+func (*ReadRequest) ProtoMessage()    {}
+func (*ReadRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_05971a9aaecb0484, []int{10}
+}
+
+func (m *ReadRequest) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_ReadRequest.Unmarshal(m, b)
+}
+func (m *ReadRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_ReadRequest.Marshal(b, m, deterministic)
+}
+func (m *ReadRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_ReadRequest.Merge(m, src)
+}
+func (m *ReadRequest) XXX_Size() int {
+	return xxx_messageInfo_ReadRequest.Size(m)
+}
+func (m *ReadRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_ReadRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_ReadRequest proto.InternalMessageInfo
+
+func (m *ReadRequest) GetKey() string {
+	if m != nil {
+		return m.Key
+	}
+	return ""
+}
+
+func (m *ReadRequest) GetPath() string {
+	if m != nil {
+		return m.Path
+	}
+	return ""
+}
+
+type ReadResponse struct {
+	Change               *Change  `protobuf:"bytes,1,opt,name=change,proto3" json:"change,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *ReadResponse) Reset()         { *m = ReadResponse{} }
+func (m *ReadResponse) String() string { return proto.CompactTextString(m) }
+func (*ReadResponse) ProtoMessage()    {}
+func (*ReadResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_05971a9aaecb0484, []int{11}
+}
+
+func (m *ReadResponse) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_ReadResponse.Unmarshal(m, b)
+}
+func (m *ReadResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_ReadResponse.Marshal(b, m, deterministic)
+}
+func (m *ReadResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_ReadResponse.Merge(m, src)
+}
+func (m *ReadResponse) XXX_Size() int {
+	return xxx_messageInfo_ReadResponse.Size(m)
+}
+func (m *ReadResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_ReadResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_ReadResponse proto.InternalMessageInfo
+
+func (m *ReadResponse) GetChange() *Change {
+	if m != nil {
+		return m.Change
+	}
+	return nil
+}
+
+type WatchRequest struct {
+	Key                  string   `protobuf:"bytes,1,opt,name=key,proto3" json:"key,omitempty"`
+	Path                 string   `protobuf:"bytes,2,opt,name=path,proto3" json:"path,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *WatchRequest) Reset()         { *m = WatchRequest{} }
+func (m *WatchRequest) String() string { return proto.CompactTextString(m) }
+func (*WatchRequest) ProtoMessage()    {}
+func (*WatchRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_05971a9aaecb0484, []int{12}
+}
+
+func (m *WatchRequest) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_WatchRequest.Unmarshal(m, b)
+}
+func (m *WatchRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_WatchRequest.Marshal(b, m, deterministic)
+}
+func (m *WatchRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_WatchRequest.Merge(m, src)
+}
+func (m *WatchRequest) XXX_Size() int {
+	return xxx_messageInfo_WatchRequest.Size(m)
+}
+func (m *WatchRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_WatchRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_WatchRequest proto.InternalMessageInfo
+
+func (m *WatchRequest) GetKey() string {
+	if m != nil {
+		return m.Key
+	}
+	return ""
+}
+
+func (m *WatchRequest) GetPath() string {
+	if m != nil {
+		return m.Path
+	}
+	return ""
+}
+
+type WatchResponse struct {
+	Key                  string     `protobuf:"bytes,1,opt,name=key,proto3" json:"key,omitempty"`
+	ChangeSet            *ChangeSet `protobuf:"bytes,2,opt,name=changeSet,proto3" json:"changeSet,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}   `json:"-"`
+	XXX_unrecognized     []byte     `json:"-"`
+	XXX_sizecache        int32      `json:"-"`
+}
+
+func (m *WatchResponse) Reset()         { *m = WatchResponse{} }
+func (m *WatchResponse) String() string { return proto.CompactTextString(m) }
+func (*WatchResponse) ProtoMessage()    {}
+func (*WatchResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_05971a9aaecb0484, []int{13}
+}
+
+func (m *WatchResponse) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_WatchResponse.Unmarshal(m, b)
+}
+func (m *WatchResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_WatchResponse.Marshal(b, m, deterministic)
+}
+func (m *WatchResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_WatchResponse.Merge(m, src)
+}
+func (m *WatchResponse) XXX_Size() int {
+	return xxx_messageInfo_WatchResponse.Size(m)
+}
+func (m *WatchResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_WatchResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_WatchResponse proto.InternalMessageInfo
+
+func (m *WatchResponse) GetKey() string {
+	if m != nil {
+		return m.Key
+	}
+	return ""
+}
+
+func (m *WatchResponse) GetChangeSet() *ChangeSet {
+	if m != nil {
+		return m.ChangeSet
+	}
+	return nil
+}
+
+func init() {
+	proto.RegisterType((*ChangeSet)(nil), "ChangeSet")
+	proto.RegisterType((*Change)(nil), "Change")
+	proto.RegisterType((*CreateRequest)(nil), "CreateRequest")
+	proto.RegisterType((*CreateResponse)(nil), "CreateResponse")
+	proto.RegisterType((*UpdateRequest)(nil), "UpdateRequest")
+	proto.RegisterType((*UpdateResponse)(nil), "UpdateResponse")
+	proto.RegisterType((*DeleteRequest)(nil), "DeleteRequest")
+	proto.RegisterType((*DeleteResponse)(nil), "DeleteResponse")
+	proto.RegisterType((*ListRequest)(nil), "ListRequest")
+	proto.RegisterType((*ListResponse)(nil), "ListResponse")
+	proto.RegisterType((*ReadRequest)(nil), "ReadRequest")
+	proto.RegisterType((*ReadResponse)(nil), "ReadResponse")
+	proto.RegisterType((*WatchRequest)(nil), "WatchRequest")
+	proto.RegisterType((*WatchResponse)(nil), "WatchResponse")
+}
+
+func init() {
+	proto.RegisterFile("go-micro/config/source/service/proto/service.proto", fileDescriptor_05971a9aaecb0484)
+}
+
+var fileDescriptor_05971a9aaecb0484 = []byte{
+	// 443 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x94, 0x93, 0xcf, 0x6a, 0xdb, 0x40,
+	0x10, 0xc6, 0x2d, 0xdb, 0x51, 0xab, 0xb1, 0x24, 0x87, 0x39, 0x14, 0x21, 0x0a, 0x35, 0x82, 0x82,
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+	0x00, 0xff, 0xff, 0xea, 0xa0, 0x1e, 0x8e, 0x23, 0x04, 0x00, 0x00,
+}

config/source/service/proto/service.pb.micro.go

@@ -0,0 +1,241 @@
+// Code generated by protoc-gen-micro. DO NOT EDIT.
+// source: go-micro/config/source/service/proto/service.proto
+
+package service
+
+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 Config service
+
+type ConfigService interface {
+	Create(ctx context.Context, in *CreateRequest, opts ...client.CallOption) (*CreateResponse, error)
+	Update(ctx context.Context, in *UpdateRequest, opts ...client.CallOption) (*UpdateResponse, error)
+	Delete(ctx context.Context, in *DeleteRequest, opts ...client.CallOption) (*DeleteResponse, error)
+	List(ctx context.Context, in *ListRequest, opts ...client.CallOption) (*ListResponse, error)
+	Read(ctx context.Context, in *ReadRequest, opts ...client.CallOption) (*ReadResponse, error)
+	Watch(ctx context.Context, in *WatchRequest, opts ...client.CallOption) (Config_WatchService, error)
+}
+
+type configService struct {
+	c    client.Client
+	name string
+}
+
+func NewConfigService(name string, c client.Client) ConfigService {
+	if c == nil {
+		c = client.NewClient()
+	}
+	if len(name) == 0 {
+		name = "config"
+	}
+	return &configService{
+		c:    c,
+		name: name,
+	}
+}
+
+func (c *configService) Create(ctx context.Context, in *CreateRequest, opts ...client.CallOption) (*CreateResponse, error) {
+	req := c.c.NewRequest(c.name, "Config.Create", in)
+	out := new(CreateResponse)
+	err := c.c.Call(ctx, req, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *configService) Update(ctx context.Context, in *UpdateRequest, opts ...client.CallOption) (*UpdateResponse, error) {
+	req := c.c.NewRequest(c.name, "Config.Update", in)
+	out := new(UpdateResponse)
+	err := c.c.Call(ctx, req, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *configService) Delete(ctx context.Context, in *DeleteRequest, opts ...client.CallOption) (*DeleteResponse, error) {
+	req := c.c.NewRequest(c.name, "Config.Delete", in)
+	out := new(DeleteResponse)
+	err := c.c.Call(ctx, req, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *configService) List(ctx context.Context, in *ListRequest, opts ...client.CallOption) (*ListResponse, error) {
+	req := c.c.NewRequest(c.name, "Config.List", in)
+	out := new(ListResponse)
+	err := c.c.Call(ctx, req, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *configService) Read(ctx context.Context, in *ReadRequest, opts ...client.CallOption) (*ReadResponse, error) {
+	req := c.c.NewRequest(c.name, "Config.Read", in)
+	out := new(ReadResponse)
+	err := c.c.Call(ctx, req, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *configService) Watch(ctx context.Context, in *WatchRequest, opts ...client.CallOption) (Config_WatchService, error) {
+	req := c.c.NewRequest(c.name, "Config.Watch", &WatchRequest{})
+	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 &configServiceWatch{stream}, nil
+}
+
+type Config_WatchService interface {
+	SendMsg(interface{}) error
+	RecvMsg(interface{}) error
+	Close() error
+	Recv() (*WatchResponse, error)
+}
+
+type configServiceWatch struct {
+	stream client.Stream
+}
+
+func (x *configServiceWatch) Close() error {
+	return x.stream.Close()
+}
+
+func (x *configServiceWatch) SendMsg(m interface{}) error {
+	return x.stream.Send(m)
+}
+
+func (x *configServiceWatch) RecvMsg(m interface{}) error {
+	return x.stream.Recv(m)
+}
+
+func (x *configServiceWatch) Recv() (*WatchResponse, error) {
+	m := new(WatchResponse)
+	err := x.stream.Recv(m)
+	if err != nil {
+		return nil, err
+	}
+	return m, nil
+}
+
+// Server API for Config service
+
+type ConfigHandler interface {
+	Create(context.Context, *CreateRequest, *CreateResponse) error
+	Update(context.Context, *UpdateRequest, *UpdateResponse) error
+	Delete(context.Context, *DeleteRequest, *DeleteResponse) error
+	List(context.Context, *ListRequest, *ListResponse) error
+	Read(context.Context, *ReadRequest, *ReadResponse) error
+	Watch(context.Context, *WatchRequest, Config_WatchStream) error
+}
+
+func RegisterConfigHandler(s server.Server, hdlr ConfigHandler, opts ...server.HandlerOption) error {
+	type config interface {
+		Create(ctx context.Context, in *CreateRequest, out *CreateResponse) error
+		Update(ctx context.Context, in *UpdateRequest, out *UpdateResponse) error
+		Delete(ctx context.Context, in *DeleteRequest, out *DeleteResponse) error
+		List(ctx context.Context, in *ListRequest, out *ListResponse) error
+		Read(ctx context.Context, in *ReadRequest, out *ReadResponse) error
+		Watch(ctx context.Context, stream server.Stream) error
+	}
+	type Config struct {
+		config
+	}
+	h := &configHandler{hdlr}
+	return s.Handle(s.NewHandler(&Config{h}, opts...))
+}
+
+type configHandler struct {
+	ConfigHandler
+}
+
+func (h *configHandler) Create(ctx context.Context, in *CreateRequest, out *CreateResponse) error {
+	return h.ConfigHandler.Create(ctx, in, out)
+}
+
+func (h *configHandler) Update(ctx context.Context, in *UpdateRequest, out *UpdateResponse) error {
+	return h.ConfigHandler.Update(ctx, in, out)
+}
+
+func (h *configHandler) Delete(ctx context.Context, in *DeleteRequest, out *DeleteResponse) error {
+	return h.ConfigHandler.Delete(ctx, in, out)
+}
+
+func (h *configHandler) List(ctx context.Context, in *ListRequest, out *ListResponse) error {
+	return h.ConfigHandler.List(ctx, in, out)
+}
+
+func (h *configHandler) Read(ctx context.Context, in *ReadRequest, out *ReadResponse) error {
+	return h.ConfigHandler.Read(ctx, in, out)
+}
+
+func (h *configHandler) Watch(ctx context.Context, stream server.Stream) error {
+	m := new(WatchRequest)
+	if err := stream.Recv(m); err != nil {
+		return err
+	}
+	return h.ConfigHandler.Watch(ctx, m, &configWatchStream{stream})
+}
+
+type Config_WatchStream interface {
+	SendMsg(interface{}) error
+	RecvMsg(interface{}) error
+	Close() error
+	Send(*WatchResponse) error
+}
+
+type configWatchStream struct {
+	stream server.Stream
+}
+
+func (x *configWatchStream) Close() error {
+	return x.stream.Close()
+}
+
+func (x *configWatchStream) SendMsg(m interface{}) error {
+	return x.stream.Send(m)
+}
+
+func (x *configWatchStream) RecvMsg(m interface{}) error {
+	return x.stream.Recv(m)
+}
+
+func (x *configWatchStream) Send(m *WatchResponse) error {
+	return x.stream.Send(m)
+}

config/source/service/proto/service.proto

@@ -0,0 +1,67 @@
+syntax = "proto3";
+
+service Config {
+	rpc Create (CreateRequest) returns (CreateResponse) {}
+	rpc Update (UpdateRequest) returns (UpdateResponse) {}
+	rpc Delete (DeleteRequest) returns (DeleteResponse) {}
+	rpc List (ListRequest) returns (ListResponse) {}
+	rpc Read (ReadRequest) returns (ReadResponse) {}
+	rpc Watch (WatchRequest) returns (stream WatchResponse) {}
+}
+
+message ChangeSet {
+    bytes data = 1;
+    string checksum = 2;
+    string format = 3;
+    string source = 4;
+    int64 timestamp = 5;
+}
+
+message Change {
+    string key = 1;
+    string path = 2;
+    ChangeSet changeSet = 3;
+}
+
+message CreateRequest {
+    Change change = 1;
+}
+
+message CreateResponse {}
+
+message UpdateRequest {
+    Change change = 1;
+}
+
+message UpdateResponse {}
+
+message DeleteRequest {
+    Change change = 1;
+}
+
+message DeleteResponse {}
+
+message ListRequest {}
+
+message ListResponse {
+    repeated Change values = 1;
+}
+
+message ReadRequest {
+    string key = 1;
+    string path = 2;
+}
+
+message ReadResponse {
+    Change change = 1;
+}
+
+message WatchRequest {
+    string key = 1;
+    string path = 2;
+}
+
+message WatchResponse {
+    string key = 1;
+    ChangeSet changeSet = 2;
+}

config/source/service/service.go

@@ -0,0 +1,90 @@
+package service
+
+import (
+	"context"
+
+	"github.com/micro/go-micro/client"
+	"github.com/micro/go-micro/config/source"
+	proto "github.com/micro/go-micro/config/source/service/proto"
+	"github.com/micro/go-micro/util/log"
+)
+
+var (
+	DefaultName   = "go.micro.config"
+	DefaultKey    = "NAMESPACE:CONFIG"
+	DefaultPath   = ""
+	DefaultClient = client.DefaultClient
+)
+
+type service struct {
+	serviceName string
+	key         string
+	path        string
+	opts        source.Options
+	client      proto.ConfigService
+}
+
+func (m *service) Read() (set *source.ChangeSet, err error) {
+	req, err := m.client.Read(context.Background(), &proto.ReadRequest{Key: m.key, Path: m.path})
+	if err != nil {
+		return nil, err
+	}
+
+	return toChangeSet(req.Change.ChangeSet), nil
+}
+
+func (m *service) Watch() (w source.Watcher, err error) {
+	stream, err := m.client.Watch(context.Background(), &proto.WatchRequest{Key: m.key, Path: m.path})
+	if err != nil {
+		log.Error("watch err: ", err)
+		return
+	}
+	return newWatcher(stream)
+}
+
+// Write is unsupported
+func (m *service) Write(cs *source.ChangeSet) error {
+	return nil
+}
+
+func (m *service) String() string {
+	return "service"
+}
+
+func NewSource(opts ...source.Option) source.Source {
+	var options source.Options
+	for _, o := range opts {
+		o(&options)
+	}
+
+	addr := DefaultName
+	key := DefaultKey
+	path := DefaultPath
+
+	if options.Context != nil {
+		a, ok := options.Context.Value(serviceNameKey{}).(string)
+		if ok {
+			addr = a
+		}
+
+		k, ok := options.Context.Value(keyKey{}).(string)
+		if ok {
+			key = k
+		}
+
+		p, ok := options.Context.Value(pathKey{}).(string)
+		if ok {
+			path = p
+		}
+	}
+
+	s := &service{
+		serviceName: addr,
+		opts:        options,
+		key:         key,
+		path:        path,
+		client:      proto.NewConfigService(addr, DefaultClient),
+	}
+
+	return s
+}

config/source/service/util.go

@@ -0,0 +1,18 @@
+package service
+
+import (
+	"time"
+
+	"github.com/micro/go-micro/config/source"
+	proto "github.com/micro/go-micro/config/source/service/proto"
+)
+
+func toChangeSet(c *proto.ChangeSet) *source.ChangeSet {
+	return &source.ChangeSet{
+		Data:      c.Data,
+		Checksum:  c.Checksum,
+		Format:    c.Format,
+		Timestamp: time.Unix(c.Timestamp, 0),
+		Source:    c.Source,
+	}
+}

config/source/service/watcher.go

@@ -0,0 +1,27 @@
+package service
+
+import (
+	"github.com/micro/go-micro/config/source"
+	proto "github.com/micro/go-micro/config/source/service/proto"
+)
+
+type watcher struct {
+	stream proto.Config_WatchService
+}
+
+func newWatcher(stream proto.Config_WatchService) (source.Watcher, error) {
+	return &watcher{stream: stream}, nil
+}
+
+func (w *watcher) Next() (*source.ChangeSet, error) {
+	var rsp proto.WatchResponse
+	err := w.stream.RecvMsg(&rsp)
+	if err != nil {
+		return nil, err
+	}
+	return toChangeSet(rsp.ChangeSet), nil
+}
+
+func (w *watcher) Stop() error {
+	return w.stream.Close()
+}

config/source/source.go

@@ -14,6 +14,7 @@ var (
 // Source is the source from which config is loaded
 type Source interface {
 	Read() (*ChangeSet, error)
+	Write(*ChangeSet) error
 	Watch() (Watcher, error)
 	String() string
 }

debug/log/default_test.go

@@ -1,32 +0,0 @@
-package log
-
-import (
-	"reflect"
-	"testing"
-)
-
-func TestLogger(t *testing.T) {
-	// set size to some value
-	size := 100
-	// override the global logger
-	DefaultLog = NewLog(Size(size))
-	// make sure we have the right size of the logger ring buffer
-	if DefaultLog.(*defaultLog).Size() != size {
-		t.Errorf("expected buffer size: %d, got: %d", size, DefaultLog.(*defaultLog).Size())
-	}
-
-	// Log some cruft
-	Info("foobar")
-	// increase the log level
-	DefaultLevel = LevelDebug
-	Debugf("foo %s", "bar")
-
-	// Check if the logs are stored in the logger ring buffer
-	expected := []string{"foobar", "foo bar"}
-	entries := DefaultLog.Read(Count(len(expected)))
-	for i, entry := range entries {
-		if !reflect.DeepEqual(entry.Value, expected[i]) {
-			t.Errorf("expected %s, got %s", expected[i], entry.Value)
-		}
-	}
-}

debug/log/kubernetes/kubernetes.go

@@ -0,0 +1,190 @@
+// Package kubernetes is a logger implementing (github.com/micro/go-micro/debug/log).Log
+package kubernetes
+
+import (
+	"bufio"
+	"encoding/json"
+	"fmt"
+	"os"
+	"sort"
+	"strconv"
+	"time"
+
+	"github.com/micro/go-micro/debug/log"
+	"github.com/micro/go-micro/util/kubernetes/client"
+)
+
+type klog struct {
+	client client.Client
+
+	log.Options
+}
+
+func (k *klog) podLogStream(podName string, stream *kubeStream) {
+	p := make(map[string]string)
+	p["follow"] = "true"
+
+	// get the logs for the pod
+	body, err := k.client.Log(&client.Resource{
+		Name: podName,
+		Kind: "pod",
+	}, client.LogParams(p))
+
+	if err != nil {
+		fmt.Fprintf(os.Stderr, err.Error())
+		return
+	}
+
+	s := bufio.NewScanner(body)
+	defer body.Close()
+
+	for {
+		select {
+		case <-stream.stop:
+			return
+		default:
+			if s.Scan() {
+				record := k.parse(s.Text())
+				stream.stream <- record
+			} else {
+				// TODO: is there a blocking call
+				// rather than a sleep loop?
+				time.Sleep(time.Second)
+			}
+		}
+	}
+}
+
+func (k *klog) getMatchingPods() ([]string, error) {
+	r := &client.Resource{
+		Kind:  "pod",
+		Value: new(client.PodList),
+	}
+
+	l := make(map[string]string)
+
+	l["name"] = client.Format(k.Options.Name)
+	// TODO: specify micro:service
+	// l["micro"] = "service"
+
+	if err := k.client.Get(r, l); err != nil {
+		return nil, err
+	}
+
+	var matches []string
+
+	for _, p := range r.Value.(*client.PodList).Items {
+		// find labels that match the name
+		if p.Metadata.Labels["name"] == client.Format(k.Options.Name) {
+			matches = append(matches, p.Metadata.Name)
+		}
+	}
+
+	return matches, nil
+}
+
+func (k *klog) parse(line string) log.Record {
+	record := log.Record{}
+
+	if err := json.Unmarshal([]byte(line), &record); err != nil {
+		record.Timestamp = time.Now().UTC()
+		record.Message = line
+		record.Metadata = make(map[string]string)
+	}
+
+	record.Metadata["service"] = k.Options.Name
+
+	return record
+}
+
+func (k *klog) Read(options ...log.ReadOption) ([]log.Record, error) {
+	opts := &log.ReadOptions{}
+	for _, o := range options {
+		o(opts)
+	}
+
+	pods, err := k.getMatchingPods()
+	if err != nil {
+		return nil, err
+	}
+
+	var records []log.Record
+
+	for _, pod := range pods {
+		logParams := make(map[string]string)
+
+		if !opts.Since.Equal(time.Time{}) {
+			logParams["sinceSeconds"] = strconv.Itoa(int(time.Since(opts.Since).Seconds()))
+		}
+
+		if opts.Count != 0 {
+			logParams["tailLines"] = strconv.Itoa(opts.Count)
+		}
+
+		if opts.Stream == true {
+			logParams["follow"] = "true"
+		}
+
+		logs, err := k.client.Log(&client.Resource{
+			Name: pod,
+			Kind: "pod",
+		}, client.LogParams(logParams))
+
+		if err != nil {
+			return nil, err
+		}
+		defer logs.Close()
+
+		s := bufio.NewScanner(logs)
+
+		for s.Scan() {
+			record := k.parse(s.Text())
+			record.Metadata["pod"] = pod
+			records = append(records, record)
+		}
+	}
+
+	// sort the records
+	sort.Slice(records, func(i, j int) bool { return records[i].Timestamp.Before(records[j].Timestamp) })
+
+	return records, nil
+}
+
+func (k *klog) Write(l log.Record) error {
+	return write(l)
+}
+
+func (k *klog) Stream() (log.Stream, error) {
+	// find the matching pods
+	pods, err := k.getMatchingPods()
+	if err != nil {
+		return nil, err
+	}
+
+	stream := &kubeStream{
+		stream: make(chan log.Record),
+		stop:   make(chan bool),
+	}
+
+	// stream from the individual pods
+	for _, pod := range pods {
+		go k.podLogStream(pod, stream)
+	}
+
+	return stream, nil
+}
+
+// NewLog returns a configured Kubernetes logger
+func NewLog(opts ...log.Option) log.Log {
+	klog := &klog{}
+	for _, o := range opts {
+		o(&klog.Options)
+	}
+
+	if len(os.Getenv("KUBERNETES_SERVICE_HOST")) > 0 {
+		klog.client = client.NewClusterClient()
+	} else {
+		klog.client = client.NewLocalClient()
+	}
+	return klog
+}

debug/log/kubernetes/kubernetes_test.go

@@ -0,0 +1,74 @@
+package kubernetes
+
+import (
+	"bytes"
+	"encoding/json"
+	"io"
+	"os"
+	"testing"
+	"time"
+
+	"github.com/micro/go-micro/debug/log"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestKubernetes(t *testing.T) {
+	// TODO: fix local test running
+	return
+
+	if os.Getenv("IN_TRAVIS_CI") == "yes" {
+		t.Skip("In Travis CI")
+	}
+
+	k := NewLog(log.Name("micro-network"))
+
+	r, w, err := os.Pipe()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	s := os.Stderr
+	os.Stderr = w
+	meta := make(map[string]string)
+
+	write := log.Record{
+		Timestamp: time.Unix(0, 0).UTC(),
+		Message:   "Test log entry",
+		Metadata:  meta,
+	}
+
+	meta["foo"] = "bar"
+
+	k.Write(write)
+	b := &bytes.Buffer{}
+	w.Close()
+	io.Copy(b, r)
+	os.Stderr = s
+
+	var read log.Record
+
+	if err := json.Unmarshal(b.Bytes(), &read); err != nil {
+		t.Fatalf("json.Unmarshal failed: %s", err.Error())
+	}
+
+	assert.Equal(t, write, read, "Write was not equal")
+
+	records, err := k.Read()
+	assert.Nil(t, err, "Read should not error")
+	assert.NotNil(t, records, "Read should return records")
+
+	stream, err := k.Stream()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	records = nil
+
+	go stream.Stop()
+
+	for s := range stream.Chan() {
+		records = append(records, s)
+	}
+
+	assert.Equal(t, 0, len(records), "Stream should return nothing")
+}

debug/log/kubernetes/stream.go

@@ -0,0 +1,40 @@
+package kubernetes
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+
+	"github.com/micro/go-micro/debug/log"
+)
+
+func write(l log.Record) error {
+	m, err := json.Marshal(l)
+	if err == nil {
+		_, err := fmt.Fprintf(os.Stderr, "%s", m)
+		return err
+	}
+	return err
+}
+
+type kubeStream struct {
+	// the k8s log stream
+	stream chan log.Record
+	// the stop chan
+	stop chan bool
+}
+
+func (k *kubeStream) Chan() <-chan log.Record {
+	return k.stream
+}
+
+func (k *kubeStream) Stop() error {
+	select {
+	case <-k.stop:
+		return nil
+	default:
+		close(k.stop)
+		close(k.stream)
+	}
+	return nil
+}

debug/log/log.go

@@ -2,178 +2,57 @@
 package log
 
 import (
+	"encoding/json"
 	"fmt"
-	"os"
 	"time"
 )
 
 var (
+	// Default buffer size if any
+	DefaultSize = 1024
 	// DefaultLog logger
 	DefaultLog = NewLog()
-	// DefaultLevel is default log level
-	DefaultLevel = LevelInfo
-	// prefix for all messages
-	prefix string
+	// Default formatter
+	DefaultFormat = TextFormat
 )
 
-// Log is event log
+// Log is debug log interface for reading and writing logs
 type Log interface {
 	// Read reads log entries from the logger
-	Read(...ReadOption) []Record
+	Read(...ReadOption) ([]Record, error)
 	// Write writes records to log
-	Write(Record)
+	Write(Record) error
 	// Stream log records
-	Stream(chan bool) <-chan Record
+	Stream() (Stream, error)
 }
 
 // Record is log record entry
 type Record struct {
 	// Timestamp of logged event
-	Timestamp time.Time
-	// Value contains log entry
-	Value interface{}
+	Timestamp time.Time `json:"timestamp"`
 	// Metadata to enrich log record
-	Metadata map[string]string
+	Metadata map[string]string `json:"metadata"`
+	// Value contains log entry
+	Message interface{} `json:"message"`
 }
 
-// level is a log level
-type Level int
-
-const (
-	LevelFatal Level = iota
-	LevelError
-	LevelInfo
-	LevelWarn
-	LevelDebug
-	LevelTrace
-)
-
-func init() {
-	switch os.Getenv("MICRO_LOG_LEVEL") {
-	case "trace":
-		DefaultLevel = LevelTrace
-	case "debug":
-		DefaultLevel = LevelDebug
-	case "warn":
-		DefaultLevel = LevelWarn
-	case "info":
-		DefaultLevel = LevelInfo
-	case "error":
-		DefaultLevel = LevelError
-	case "fatal":
-		DefaultLevel = LevelFatal
-	}
+// Stream returns a log stream
+type Stream interface {
+	Chan() <-chan Record
+	Stop() error
 }
 
-func log(v ...interface{}) {
-	if len(prefix) > 0 {
-		DefaultLog.Write(Record{Value: fmt.Sprint(append([]interface{}{prefix, " "}, v...)...)})
-		return
-	}
-	DefaultLog.Write(Record{Value: fmt.Sprint(v...)})
+// Format is a function which formats the output
+type FormatFunc func(Record) string
+
+// TextFormat returns text format
+func TextFormat(r Record) string {
+	t := r.Timestamp.Format("2006-01-02 15:04:05")
+	return fmt.Sprintf("%s %v", t, r.Message)
 }
 
-func logf(format string, v ...interface{}) {
-	if len(prefix) > 0 {
-		format = prefix + " " + format
-	}
-	DefaultLog.Write(Record{Value: fmt.Sprintf(format, v...)})
-}
-
-// WithLevel logs with the level specified
-func WithLevel(l Level, v ...interface{}) {
-	if l > DefaultLevel {
-		return
-	}
-	log(v...)
-}
-
-// WithLevel logs with the level specified
-func WithLevelf(l Level, format string, v ...interface{}) {
-	if l > DefaultLevel {
-		return
-	}
-	logf(format, v...)
-}
-
-// Trace provides trace level logging
-func Trace(v ...interface{}) {
-	WithLevel(LevelTrace, v...)
-}
-
-// Tracef provides trace level logging
-func Tracef(format string, v ...interface{}) {
-	WithLevelf(LevelTrace, format, v...)
-}
-
-// Debug provides debug level logging
-func Debug(v ...interface{}) {
-	WithLevel(LevelDebug, v...)
-}
-
-// Debugf provides debug level logging
-func Debugf(format string, v ...interface{}) {
-	WithLevelf(LevelDebug, format, v...)
-}
-
-// Warn provides warn level logging
-func Warn(v ...interface{}) {
-	WithLevel(LevelWarn, v...)
-}
-
-// Warnf provides warn level logging
-func Warnf(format string, v ...interface{}) {
-	WithLevelf(LevelWarn, format, v...)
-}
-
-// Info provides info level logging
-func Info(v ...interface{}) {
-	WithLevel(LevelInfo, v...)
-}
-
-// Infof provides info level logging
-func Infof(format string, v ...interface{}) {
-	WithLevelf(LevelInfo, format, v...)
-}
-
-// Error provides warn level logging
-func Error(v ...interface{}) {
-	WithLevel(LevelError, v...)
-}
-
-// Errorf provides warn level logging
-func Errorf(format string, v ...interface{}) {
-	WithLevelf(LevelError, format, v...)
-}
-
-// Fatal logs with Log and then exits with os.Exit(1)
-func Fatal(v ...interface{}) {
-	WithLevel(LevelFatal, v...)
-	os.Exit(1)
-}
-
-// Fatalf logs with Logf and then exits with os.Exit(1)
-func Fatalf(format string, v ...interface{}) {
-	WithLevelf(LevelFatal, format, v...)
-	os.Exit(1)
-}
-
-// SetLevel sets the log level
-func SetLevel(l Level) {
-	DefaultLevel = l
-}
-
-// GetLevel returns the current level
-func GetLevel() Level {
-	return DefaultLevel
-}
-
-// Set a prefix for the logger
-func SetPrefix(p string) {
-	prefix = p
-}
-
-// Set service name
-func Name(name string) {
-	prefix = fmt.Sprintf("[%s]", name)
+// JSONFormat is a json Format func
+func JSONFormat(r Record) string {
+	b, _ := json.Marshal(r)
+	return string(b)
 }

debug/log/memory/memory.go

@@ -1,52 +1,53 @@
-package log
+// Package memory provides an in memory log buffer
+package memory
 
 import (
 	"fmt"
-	golog "log"
 
-	"github.com/micro/go-micro/debug/buffer"
+	"github.com/micro/go-micro/debug/log"
+	"github.com/micro/go-micro/util/ring"
 )
 
 var (
 	// DefaultSize of the logger buffer
-	DefaultSize = 1000
+	DefaultSize = 1024
 )
 
-// defaultLog is default micro log
-type defaultLog struct {
-	*buffer.Buffer
+// memoryLog is default micro log
+type memoryLog struct {
+	*ring.Buffer
 }
 
 // NewLog returns default Logger with
-func NewLog(opts ...Option) Log {
+func NewLog(opts ...log.Option) log.Log {
 	// get default options
-	options := DefaultOptions()
+	options := log.DefaultOptions()
 
 	// apply requested options
 	for _, o := range opts {
 		o(&options)
 	}
 
-	return &defaultLog{
-		Buffer: buffer.New(options.Size),
+	return &memoryLog{
+		Buffer: ring.New(options.Size),
 	}
 }
 
 // Write writes logs into logger
-func (l *defaultLog) Write(r Record) {
-	golog.Print(r.Value)
-	l.Buffer.Put(fmt.Sprint(r.Value))
+func (l *memoryLog) Write(r log.Record) error {
+	l.Buffer.Put(fmt.Sprint(r.Message))
+	return nil
 }
 
 // Read reads logs and returns them
-func (l *defaultLog) Read(opts ...ReadOption) []Record {
-	options := ReadOptions{}
+func (l *memoryLog) Read(opts ...log.ReadOption) ([]log.Record, error) {
+	options := log.ReadOptions{}
 	// initialize the read options
 	for _, o := range opts {
 		o(&options)
 	}
 
-	var entries []*buffer.Entry
+	var entries []*ring.Entry
 	// if Since options ha sbeen specified we honor it
 	if !options.Since.IsZero() {
 		entries = l.Buffer.Since(options.Since)
@@ -69,24 +70,25 @@ func (l *defaultLog) Read(opts ...ReadOption) []Record {
 		}
 	}
 
-	records := make([]Record, 0, len(entries))
+	records := make([]log.Record, 0, len(entries))
 	for _, entry := range entries {
-		record := Record{
+		record := log.Record{
 			Timestamp: entry.Timestamp,
-			Value:     entry.Value,
+			Message:   entry.Value,
 		}
 		records = append(records, record)
 	}
 
-	return records
+	return records, nil
 }
 
 // Stream returns channel for reading log records
-func (l *defaultLog) Stream(stop chan bool) <-chan Record {
+// along with a stop channel, close it when done
+func (l *memoryLog) Stream() (log.Stream, error) {
 	// get stream channel from ring buffer
-	stream := l.Buffer.Stream(stop)
+	stream, stop := l.Buffer.Stream()
 	// make a buffered channel
-	records := make(chan Record, 128)
+	records := make(chan log.Record, 128)
 	// get last 10 records
 	last10 := l.Buffer.Get(10)
 
@@ -94,21 +96,24 @@ func (l *defaultLog) Stream(stop chan bool) <-chan Record {
 	go func() {
 		// first send last 10 records
 		for _, entry := range last10 {
-			records <- Record{
+			records <- log.Record{
 				Timestamp: entry.Timestamp,
-				Value:     entry.Value,
+				Message:   entry.Value,
 				Metadata:  make(map[string]string),
 			}
 		}
 		// now stream continuously
 		for entry := range stream {
-			records <- Record{
+			records <- log.Record{
 				Timestamp: entry.Timestamp,
-				Value:     entry.Value,
+				Message:   entry.Value,
 				Metadata:  make(map[string]string),
 			}
 		}
 	}()
 
-	return records
+	return &logStream{
+		stream: records,
+		stop:   stop,
+	}, nil
 }

debug/log/memory/memory_test.go

@@ -0,0 +1,32 @@
+package memory
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/micro/go-micro/debug/log"
+)
+
+func TestLogger(t *testing.T) {
+	// set size to some value
+	size := 100
+	// override the global logger
+	lg := NewLog(log.Size(size))
+	// make sure we have the right size of the logger ring buffer
+	if lg.(*memoryLog).Size() != size {
+		t.Errorf("expected buffer size: %d, got: %d", size, lg.(*memoryLog).Size())
+	}
+
+	// Log some cruft
+	lg.Write(log.Record{Message: "foobar"})
+	lg.Write(log.Record{Message: "foo bar"})
+
+	// Check if the logs are stored in the logger ring buffer
+	expected := []string{"foobar", "foo bar"}
+	entries, _ := lg.Read(log.Count(len(expected)))
+	for i, entry := range entries {
+		if !reflect.DeepEqual(entry.Message, expected[i]) {
+			t.Errorf("expected %s, got %s", expected[i], entry.Message)
+		}
+	}
+}

debug/log/memory/stream.go

@@ -0,0 +1,24 @@
+package memory
+
+import (
+	"github.com/micro/go-micro/debug/log"
+)
+
+type logStream struct {
+	stream <-chan log.Record
+	stop   chan bool
+}
+
+func (l *logStream) Chan() <-chan log.Record {
+	return l.stream
+}
+
+func (l *logStream) Stop() error {
+	select {
+	case <-l.stop:
+		return nil
+	default:
+		close(l.stop)
+	}
+	return nil
+}

debug/log/noop/noop.go

@@ -0,0 +1,23 @@
+package noop
+
+import (
+	"github.com/micro/go-micro/debug/log"
+)
+
+type noop struct{}
+
+func (n *noop) Read(...log.ReadOption) ([]log.Record, error) {
+	return nil, nil
+}
+
+func (n *noop) Write(log.Record) error {
+	return nil
+}
+
+func (n *noop) Stream() (log.Stream, error) {
+	return nil, nil
+}
+
+func NewLog(opts ...log.Option) log.Log {
+	return new(noop)
+}

debug/log/options.go

@@ -7,8 +7,19 @@ type Option func(*Options)
 
 // Options are logger options
 type Options struct {
+	// Name of the log
+	Name string
 	// Size is the size of ring buffer
 	Size int
+	// Format specifies the output format
+	Format FormatFunc
+}
+
+// Name of the log
+func Name(n string) Option {
+	return func(o *Options) {
+		o.Name = n
+	}
 }
 
 // Size sets the size of the ring buffer
@@ -18,6 +29,12 @@ func Size(s int) Option {
 	}
 }
 
+func Format(f FormatFunc) Option {
+	return func(o *Options) {
+		o.Format = f
+	}
+}
+
 // DefaultOptions returns default options
 func DefaultOptions() Options {
 	return Options{
@@ -51,10 +68,3 @@ func Count(c int) ReadOption {
 		o.Count = c
 	}
 }
-
-// Stream requests continuous log stream
-func Stream(s bool) ReadOption {
-	return func(o *ReadOptions) {
-		o.Stream = s
-	}
-}

debug/log/os.go

@@ -0,0 +1,200 @@
+package log
+
+import (
+	"bufio"
+	"encoding/json"
+	"io"
+	"os"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/google/uuid"
+	"github.com/micro/go-micro/util/ring"
+)
+
+// Should stream from OS
+type osLog struct {
+	format FormatFunc
+	once   sync.Once
+
+	sync.RWMutex
+	buffer *ring.Buffer
+	subs   map[string]*osStream
+}
+
+type osStream struct {
+	stream chan Record
+	stop   chan bool
+}
+
+// watch io stream
+func (o *osLog) run() {
+	// save outputs
+	stdout := *os.Stdout
+	stderr := *os.Stderr
+
+	// new os pipe
+	r, w := io.Pipe()
+
+	// create new iopipes
+	r1, w1, _ := os.Pipe()
+	r2, w2, _ := os.Pipe()
+
+	// create tea readers
+	tee1 := io.TeeReader(r1, &stdout)
+	tee2 := io.TeeReader(r2, &stderr)
+
+	// start copying
+	go io.Copy(w, tee1)
+	go io.Copy(w, tee2)
+
+	// set default go log output
+	//log.SetOutput(w2)
+
+	// replace os stdout and os stderr
+	*os.Stdout = *w1
+	*os.Stderr = *w2
+
+	// this should short circuit everything
+	defer func() {
+		// reset stdout and stderr
+		*os.Stdout = stdout
+		*os.Stderr = stderr
+		//log.SetOutput(stderr)
+
+		// close all the outputs
+		r.Close()
+		r1.Close()
+		r2.Close()
+		w.Close()
+		w1.Close()
+		w2.Close()
+	}()
+
+	// read from standard error
+	scanner := bufio.NewReader(r)
+
+	for {
+		// read the line
+		line, err := scanner.ReadString('\n')
+		if err != nil {
+			return
+		}
+		// check if the line exists
+		if len(line) == 0 {
+			continue
+		}
+		// parse the record
+		var r Record
+		if line[0] == '{' {
+			json.Unmarshal([]byte(line), &r)
+		} else {
+			r = Record{
+				Timestamp: time.Now(),
+				Message:   strings.TrimSuffix(line, "\n"),
+				Metadata:  make(map[string]string),
+			}
+		}
+
+		o.Lock()
+
+		// write to the buffer
+		o.buffer.Put(r)
+
+		// check subs and send to stream
+		for id, sub := range o.subs {
+			// send to stream
+			select {
+			case <-sub.stop:
+				delete(o.subs, id)
+			case sub.stream <- r:
+				// send to stream
+			default:
+				// do not block
+			}
+		}
+
+		o.Unlock()
+	}
+}
+
+// Read reads log entries from the logger
+func (o *osLog) Read(...ReadOption) ([]Record, error) {
+	o.once.Do(func() {
+		go o.run()
+	})
+
+	var records []Record
+
+	// read the last 100 records
+	for _, v := range o.buffer.Get(100) {
+		records = append(records, v.Value.(Record))
+	}
+
+	return records, nil
+}
+
+// Write writes records to log
+func (o *osLog) Write(r Record) error {
+	o.once.Do(func() {
+		go o.run()
+	})
+
+	// generate output
+	out := o.format(r) + "\n"
+	_, err := os.Stderr.Write([]byte(out))
+	return err
+}
+
+// Stream log records
+func (o *osLog) Stream() (Stream, error) {
+	o.once.Do(func() {
+		go o.run()
+	})
+
+	o.Lock()
+	defer o.Unlock()
+
+	// create stream
+	st := &osStream{
+		stream: make(chan Record, 128),
+		stop:   make(chan bool),
+	}
+
+	// save stream
+	o.subs[uuid.New().String()] = st
+
+	return st, nil
+}
+
+func (o *osStream) Chan() <-chan Record {
+	return o.stream
+}
+
+func (o *osStream) Stop() error {
+	select {
+	case <-o.stop:
+		return nil
+	default:
+		close(o.stop)
+	}
+	return nil
+}
+
+func NewLog(opts ...Option) Log {
+	options := Options{
+		Format: DefaultFormat,
+	}
+	for _, o := range opts {
+		o(&options)
+	}
+
+	l := &osLog{
+		format: options.Format,
+		buffer: ring.New(1024),
+		subs:   make(map[string]*osStream),
+	}
+
+	return l
+}

debug/profile/http/http.go

@@ -0,0 +1,78 @@
+// Package http enables the http profiler
+package http
+
+import (
+	"context"
+	"net/http"
+	"net/http/pprof"
+	"sync"
+
+	"github.com/micro/go-micro/debug/profile"
+)
+
+type httpProfile struct {
+	sync.Mutex
+	running bool
+	server  *http.Server
+}
+
+var (
+	DefaultAddress = ":6060"
+)
+
+// Start the profiler
+func (h *httpProfile) Start() error {
+	h.Lock()
+	defer h.Unlock()
+
+	if h.running {
+		return nil
+	}
+
+	go func() {
+		if err := h.server.ListenAndServe(); err != nil {
+			h.Lock()
+			h.running = false
+			h.Unlock()
+		}
+	}()
+
+	h.running = true
+
+	return nil
+}
+
+// Stop the profiler
+func (h *httpProfile) Stop() error {
+	h.Lock()
+	defer h.Unlock()
+
+	if !h.running {
+		return nil
+	}
+
+	h.running = false
+
+	return h.server.Shutdown(context.TODO())
+}
+
+func (h *httpProfile) String() string {
+	return "http"
+}
+
+func NewProfile(opts ...profile.Option) profile.Profile {
+	mux := http.NewServeMux()
+
+	mux.HandleFunc("/debug/pprof/", pprof.Index)
+	mux.HandleFunc("/debug/pprof/cmdline", pprof.Cmdline)
+	mux.HandleFunc("/debug/pprof/profile", pprof.Profile)
+	mux.HandleFunc("/debug/pprof/symbol", pprof.Symbol)
+	mux.HandleFunc("/debug/pprof/trace", pprof.Trace)
+
+	return &httpProfile{
+		server: &http.Server{
+			Addr:    DefaultAddress,
+			Handler: mux,
+		},
+	}
+}

debug/profile/pprof/pprof.go

@@ -107,6 +107,10 @@ func (p *profiler) Stop() error {
 	}
 }
 
+func (p *profiler) String() string {
+	return "pprof"
+}
+
 func NewProfile(opts ...profile.Option) profile.Profile {
 	var options profile.Options
 	for _, o := range opts {

debug/profile/profile.go

@@ -6,6 +6,8 @@ type Profile interface {
 	Start() error
 	// Stop the profiler
 	Stop() error
+	// Name of the profiler
+	String() string
 }
 
 type Options struct {

debug/service/client.go

@@ -0,0 +1,87 @@
+// Package service provides the service log
+package service
+
+import (
+	"context"
+	"time"
+
+	"github.com/micro/go-micro/client"
+
+	"github.com/micro/go-micro/debug/log"
+	pb "github.com/micro/go-micro/debug/service/proto"
+)
+
+// Debug provides debug service client
+type debugClient struct {
+	Client pb.DebugService
+}
+
+// Logs queries the services logs and returns a channel to read the logs from
+func (d *debugClient) Log(since time.Time, count int, stream bool) (log.Stream, error) {
+	req := &pb.LogRequest{}
+	if !since.IsZero() {
+		req.Since = since.Unix()
+	}
+
+	if count > 0 {
+		req.Count = int64(count)
+	}
+
+	// set whether to stream
+	req.Stream = stream
+
+	// get the log stream
+	serverStream, err := d.Client.Log(context.Background(), req)
+	if err != nil {
+		return nil, err
+	}
+
+	lg := &logStream{
+		stream: make(chan log.Record),
+		stop:   make(chan bool),
+	}
+
+	// go stream logs
+	go d.streamLogs(lg, serverStream)
+
+	return lg, nil
+}
+
+func (d *debugClient) streamLogs(lg *logStream, stream pb.Debug_LogService) {
+	defer stream.Close()
+	defer lg.Stop()
+
+	for {
+		resp, err := stream.Recv()
+		if err != nil {
+			break
+		}
+
+		metadata := make(map[string]string)
+		for k, v := range resp.Metadata {
+			metadata[k] = v
+		}
+
+		record := log.Record{
+			Timestamp: time.Unix(resp.Timestamp, 0),
+			Message:   resp.Message,
+			Metadata:  metadata,
+		}
+
+		select {
+		case <-lg.stop:
+			return
+		case lg.stream <- record:
+		}
+	}
+}
+
+// NewClient provides a debug client
+func NewClient(name string) *debugClient {
+	// create default client
+	cli := client.DefaultClient
+
+	return &debugClient{
+		Client: pb.NewDebugService(name, cli),
+	}
+}

debug/service/handler/debug.go

@@ -1,32 +1,35 @@
-// Pacjage handler implements service debug handler
+// Package handler implements service debug handler embedded in go-micro services
 package handler
 
 import (
 	"context"
-	"runtime"
 	"time"
 
 	"github.com/micro/go-micro/debug/log"
 	proto "github.com/micro/go-micro/debug/service/proto"
+	"github.com/micro/go-micro/debug/stats"
+	"github.com/micro/go-micro/debug/trace"
 	"github.com/micro/go-micro/server"
 )
 
-var (
-	// DefaultHandler is default debug handler
-	DefaultHandler = newDebug()
-)
-
-type Debug struct {
-	started int64
-	proto.DebugHandler
-	log log.Log
+// NewHandler returns an instance of the Debug Handler
+func NewHandler() *Debug {
+	return &Debug{
+		log:   log.DefaultLog,
+		stats: stats.DefaultStats,
+		trace: trace.DefaultTracer,
+	}
 }
 
-func newDebug() *Debug {
-	return &Debug{
-		started: time.Now().Unix(),
-		log:     log.DefaultLog,
-	}
+type Debug struct {
+	// must honour the debug handler
+	proto.DebugHandler
+	// the logger for retrieving logs
+	log log.Log
+	// the stats collector
+	stats stats.Stats
+	// the tracer
+	trace trace.Tracer
 }
 
 func (d *Debug) Health(ctx context.Context, req *proto.HealthRequest, rsp *proto.HealthResponse) error {
@@ -35,15 +38,46 @@ func (d *Debug) Health(ctx context.Context, req *proto.HealthRequest, rsp *proto
 }
 
 func (d *Debug) Stats(ctx context.Context, req *proto.StatsRequest, rsp *proto.StatsResponse) error {
-	var mstat runtime.MemStats
-	runtime.ReadMemStats(&mstat)
+	stats, err := d.stats.Read()
+	if err != nil {
+		return err
+	}
+
+	if len(stats) == 0 {
+		return nil
+	}
+
+	// write the response values
+	rsp.Timestamp = uint64(stats[0].Timestamp)
+	rsp.Started = uint64(stats[0].Started)
+	rsp.Uptime = uint64(stats[0].Uptime)
+	rsp.Memory = stats[0].Memory
+	rsp.Gc = stats[0].GC
+	rsp.Threads = stats[0].Threads
+	rsp.Requests = stats[0].Requests
+	rsp.Errors = stats[0].Errors
+
+	return nil
+}
+
+func (d *Debug) Trace(ctx context.Context, req *proto.TraceRequest, rsp *proto.TraceResponse) error {
+	traces, err := d.trace.Read(trace.ReadTrace(req.Id))
+	if err != nil {
+		return err
+	}
+
+	for _, trace := range traces {
+		rsp.Spans = append(rsp.Spans, &proto.Span{
+			Trace:    trace.Trace,
+			Id:       trace.Id,
+			Parent:   trace.Parent,
+			Name:     trace.Name,
+			Started:  uint64(trace.Started.UnixNano()),
+			Duration: uint64(trace.Duration.Nanoseconds()),
+			Metadata: trace.Metadata,
+		})
+	}
 
-	rsp.Timestamp = uint64(time.Now().Unix())
-	rsp.Started = uint64(d.started)
-	rsp.Uptime = uint64(time.Now().Unix() - d.started)
-	rsp.Memory = mstat.Alloc
-	rsp.Gc = mstat.PauseTotalNs
-	rsp.Threads = uint64(runtime.NumGoroutine())
 	return nil
 }
 
@@ -66,51 +100,59 @@ func (d *Debug) Log(ctx context.Context, stream server.Stream) error {
 	}
 
 	if req.Stream {
-		stop := make(chan bool)
-		defer close(stop)
-
-		// TODO: we need to figure out how to close ithe log stream
+		// TODO: we need to figure out how to close the log stream
 		// It seems like when a client disconnects,
 		// the connection stays open until some timeout expires
 		// or something like that; that means the map of streams
 		// might end up leaking memory if not cleaned up properly
-		records := d.log.Stream(stop)
-		for record := range records {
-			if err := d.sendRecord(record, stream); err != nil {
+		lgStream, err := d.log.Stream()
+		if err != nil {
+			return err
+		}
+		defer lgStream.Stop()
+
+		for record := range lgStream.Chan() {
+			// copy metadata
+			metadata := make(map[string]string)
+			for k, v := range record.Metadata {
+				metadata[k] = v
+			}
+			// send record
+			if err := stream.Send(&proto.Record{
+				Timestamp: record.Timestamp.Unix(),
+				Message:   record.Message.(string),
+				Metadata:  metadata,
+			}); err != nil {
 				return err
 			}
 		}
+
 		// done streaming, return
 		return nil
 	}
 
 	// get the log records
-	records := d.log.Read(options...)
+	records, err := d.log.Read(options...)
+	if err != nil {
+		return err
+	}
+
 	// send all the logs downstream
 	for _, record := range records {
-		if err := d.sendRecord(record, stream); err != nil {
+		// copy metadata
+		metadata := make(map[string]string)
+		for k, v := range record.Metadata {
+			metadata[k] = v
+		}
+		// send record
+		if err := stream.Send(&proto.Record{
+			Timestamp: record.Timestamp.Unix(),
+			Message:   record.Message.(string),
+			Metadata:  metadata,
+		}); err != nil {
 			return err
 		}
 	}
 
 	return nil
 }
-
-func (d *Debug) sendRecord(record log.Record, stream server.Stream) error {
-	metadata := make(map[string]string)
-	for k, v := range record.Metadata {
-		metadata[k] = v
-	}
-
-	pbRecord := &proto.Record{
-		Timestamp: record.Timestamp.Unix(),
-		Value:     record.Value.(string),
-		Metadata:  metadata,
-	}
-
-	if err := stream.Send(pbRecord); err != nil {
-		return err
-	}
-
-	return nil
-}

debug/service/proto/debug.pb.go

@@ -152,7 +152,11 @@ type StatsResponse struct {
 	// num threads
 	Threads uint64 `protobuf:"varint,5,opt,name=threads,proto3" json:"threads,omitempty"`
 	// total gc in nanoseconds
-	Gc                   uint64   `protobuf:"varint,6,opt,name=gc,proto3" json:"gc,omitempty"`
+	Gc uint64 `protobuf:"varint,6,opt,name=gc,proto3" json:"gc,omitempty"`
+	// total number of requests
+	Requests uint64 `protobuf:"varint,7,opt,name=requests,proto3" json:"requests,omitempty"`
+	// total number of errors
+	Errors               uint64   `protobuf:"varint,8,opt,name=errors,proto3" json:"errors,omitempty"`
 	XXX_NoUnkeyedLiteral struct{} `json:"-"`
 	XXX_unrecognized     []byte   `json:"-"`
 	XXX_sizecache        int32    `json:"-"`
@@ -225,6 +229,20 @@ func (m *StatsResponse) GetGc() uint64 {
 	return 0
 }
 
+func (m *StatsResponse) GetRequests() uint64 {
+	if m != nil {
+		return m.Requests
+	}
+	return 0
+}
+
+func (m *StatsResponse) GetErrors() uint64 {
+	if m != nil {
+		return m.Errors
+	}
+	return 0
+}
+
 // LogRequest requests service logs
 type LogRequest struct {
 	// service to request logs for
@@ -299,13 +317,13 @@ func (m *LogRequest) GetSince() int64 {
 type Record struct {
 	// timestamp of log record
 	Timestamp int64 `protobuf:"varint,1,opt,name=timestamp,proto3" json:"timestamp,omitempty"`
-	// record value
-	Value string `protobuf:"bytes,2,opt,name=value,proto3" json:"value,omitempty"`
 	// record metadata
-	Metadata             map[string]string `protobuf:"bytes,3,rep,name=metadata,proto3" json:"metadata,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
-	XXX_NoUnkeyedLiteral struct{}          `json:"-"`
-	XXX_unrecognized     []byte            `json:"-"`
-	XXX_sizecache        int32             `json:"-"`
+	Metadata map[string]string `protobuf:"bytes,2,rep,name=metadata,proto3" json:"metadata,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	// message
+	Message              string   `protobuf:"bytes,3,opt,name=message,proto3" json:"message,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
 }
 
 func (m *Record) Reset()         { *m = Record{} }
@@ -340,14 +358,187 @@ func (m *Record) GetTimestamp() int64 {
 	return 0
 }
 
-func (m *Record) GetValue() string {
+func (m *Record) GetMetadata() map[string]string {
 	if m != nil {
-		return m.Value
+		return m.Metadata
+	}
+	return nil
+}
+
+func (m *Record) GetMessage() string {
+	if m != nil {
+		return m.Message
 	}
 	return ""
 }
 
-func (m *Record) GetMetadata() map[string]string {
+type TraceRequest struct {
+	// trace id to retrieve
+	Id                   string   `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *TraceRequest) Reset()         { *m = TraceRequest{} }
+func (m *TraceRequest) String() string { return proto.CompactTextString(m) }
+func (*TraceRequest) ProtoMessage()    {}
+func (*TraceRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_dea322649cde1ef2, []int{6}
+}
+
+func (m *TraceRequest) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_TraceRequest.Unmarshal(m, b)
+}
+func (m *TraceRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_TraceRequest.Marshal(b, m, deterministic)
+}
+func (m *TraceRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_TraceRequest.Merge(m, src)
+}
+func (m *TraceRequest) XXX_Size() int {
+	return xxx_messageInfo_TraceRequest.Size(m)
+}
+func (m *TraceRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_TraceRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_TraceRequest proto.InternalMessageInfo
+
+func (m *TraceRequest) GetId() string {
+	if m != nil {
+		return m.Id
+	}
+	return ""
+}
+
+type TraceResponse struct {
+	Spans                []*Span  `protobuf:"bytes,1,rep,name=spans,proto3" json:"spans,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *TraceResponse) Reset()         { *m = TraceResponse{} }
+func (m *TraceResponse) String() string { return proto.CompactTextString(m) }
+func (*TraceResponse) ProtoMessage()    {}
+func (*TraceResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_dea322649cde1ef2, []int{7}
+}
+
+func (m *TraceResponse) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_TraceResponse.Unmarshal(m, b)
+}
+func (m *TraceResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_TraceResponse.Marshal(b, m, deterministic)
+}
+func (m *TraceResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_TraceResponse.Merge(m, src)
+}
+func (m *TraceResponse) XXX_Size() int {
+	return xxx_messageInfo_TraceResponse.Size(m)
+}
+func (m *TraceResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_TraceResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_TraceResponse proto.InternalMessageInfo
+
+func (m *TraceResponse) GetSpans() []*Span {
+	if m != nil {
+		return m.Spans
+	}
+	return nil
+}
+
+type Span struct {
+	// the trace id
+	Trace string `protobuf:"bytes,1,opt,name=trace,proto3" json:"trace,omitempty"`
+	// id of the span
+	Id string `protobuf:"bytes,2,opt,name=id,proto3" json:"id,omitempty"`
+	// parent span
+	Parent string `protobuf:"bytes,3,opt,name=parent,proto3" json:"parent,omitempty"`
+	// name of the resource
+	Name string `protobuf:"bytes,4,opt,name=name,proto3" json:"name,omitempty"`
+	// time of start in nanoseconds
+	Started uint64 `protobuf:"varint,5,opt,name=started,proto3" json:"started,omitempty"`
+	// duration of the execution in nanoseconds
+	Duration uint64 `protobuf:"varint,6,opt,name=duration,proto3" json:"duration,omitempty"`
+	// associated metadata
+	Metadata             map[string]string `protobuf:"bytes,7,rep,name=metadata,proto3" json:"metadata,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	XXX_NoUnkeyedLiteral struct{}          `json:"-"`
+	XXX_unrecognized     []byte            `json:"-"`
+	XXX_sizecache        int32             `json:"-"`
+}
+
+func (m *Span) Reset()         { *m = Span{} }
+func (m *Span) String() string { return proto.CompactTextString(m) }
+func (*Span) ProtoMessage()    {}
+func (*Span) Descriptor() ([]byte, []int) {
+	return fileDescriptor_dea322649cde1ef2, []int{8}
+}
+
+func (m *Span) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_Span.Unmarshal(m, b)
+}
+func (m *Span) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_Span.Marshal(b, m, deterministic)
+}
+func (m *Span) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_Span.Merge(m, src)
+}
+func (m *Span) XXX_Size() int {
+	return xxx_messageInfo_Span.Size(m)
+}
+func (m *Span) XXX_DiscardUnknown() {
+	xxx_messageInfo_Span.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_Span proto.InternalMessageInfo
+
+func (m *Span) GetTrace() string {
+	if m != nil {
+		return m.Trace
+	}
+	return ""
+}
+
+func (m *Span) GetId() string {
+	if m != nil {
+		return m.Id
+	}
+	return ""
+}
+
+func (m *Span) GetParent() string {
+	if m != nil {
+		return m.Parent
+	}
+	return ""
+}
+
+func (m *Span) GetName() string {
+	if m != nil {
+		return m.Name
+	}
+	return ""
+}
+
+func (m *Span) GetStarted() uint64 {
+	if m != nil {
+		return m.Started
+	}
+	return 0
+}
+
+func (m *Span) GetDuration() uint64 {
+	if m != nil {
+		return m.Duration
+	}
+	return 0
+}
+
+func (m *Span) GetMetadata() map[string]string {
 	if m != nil {
 		return m.Metadata
 	}
@@ -362,6 +553,10 @@ func init() {
 	proto.RegisterType((*LogRequest)(nil), "LogRequest")
 	proto.RegisterType((*Record)(nil), "Record")
 	proto.RegisterMapType((map[string]string)(nil), "Record.MetadataEntry")
+	proto.RegisterType((*TraceRequest)(nil), "TraceRequest")
+	proto.RegisterType((*TraceResponse)(nil), "TraceResponse")
+	proto.RegisterType((*Span)(nil), "Span")
+	proto.RegisterMapType((map[string]string)(nil), "Span.MetadataEntry")
 }
 
 func init() {
@@ -369,30 +564,40 @@ func init() {
 }
 
 var fileDescriptor_dea322649cde1ef2 = []byte{
-	// 399 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x84, 0x52, 0xc1, 0x6e, 0xd4, 0x30,
-	0x10, 0xdd, 0xac, 0x9b, 0xb4, 0x3b, 0x65, 0x17, 0x64, 0x15, 0x64, 0xad, 0x90, 0xa8, 0x7c, 0x0a,
-	0x42, 0x78, 0xa1, 0x5c, 0x10, 0x5c, 0x41, 0xe2, 0x50, 0x2e, 0xe6, 0x0b, 0xdc, 0x64, 0x94, 0x2e,
-	0x34, 0x71, 0xb0, 0x27, 0x95, 0xf6, 0xc4, 0xb7, 0x70, 0xe7, 0x23, 0x51, 0x6c, 0x2f, 0x6d, 0x44,
-	0xa5, 0xbd, 0xcd, 0x7b, 0xf3, 0xf4, 0x3c, 0x33, 0x7e, 0xa0, 0xda, 0x6d, 0xe5, 0xec, 0xa6, 0xb1,
-	0xaf, 0x63, 0x51, 0xe3, 0xd5, 0xd0, 0x6c, 0x3c, 0xba, 0xdb, 0x6d, 0x85, 0x9b, 0xde, 0x59, 0x4a,
-	0x9c, 0x0a, 0xb5, 0x7c, 0x09, 0xcb, 0x2f, 0x68, 0x6e, 0xe8, 0x5a, 0xe3, 0xcf, 0x01, 0x3d, 0x71,
-	0x01, 0xc7, 0x49, 0x2d, 0xb2, 0xf3, 0xac, 0x5c, 0xe8, 0x3d, 0x94, 0x25, 0xac, 0xf6, 0x52, 0xdf,
-	0xdb, 0xce, 0x23, 0x7f, 0x06, 0x85, 0x27, 0x43, 0x83, 0x4f, 0xd2, 0x84, 0x64, 0x09, 0x8f, 0xbe,
-	0x91, 0x21, 0x7f, 0xd8, 0xf3, 0x77, 0x06, 0xcb, 0x24, 0x4d, 0x9e, 0xcf, 0x61, 0x41, 0xdb, 0x16,
-	0x3d, 0x99, 0xb6, 0x0f, 0xea, 0x23, 0x7d, 0x47, 0x04, 0x27, 0x32, 0x8e, 0xb0, 0x16, 0xf3, 0xd0,
-	0xdb, 0xc3, 0x71, 0x96, 0xa1, 0x1f, 0x85, 0x82, 0x85, 0x46, 0x42, 0x23, 0xdf, 0x62, 0x6b, 0xdd,
-	0x4e, 0x1c, 0x45, 0x3e, 0xa2, 0xd1, 0x89, 0xae, 0x1d, 0x9a, 0xda, 0x8b, 0x3c, 0x3a, 0x25, 0xc8,
-	0x57, 0x30, 0x6f, 0x2a, 0x51, 0x04, 0x72, 0xde, 0x54, 0xf2, 0x3b, 0xc0, 0xa5, 0x6d, 0x0e, 0xee,
-	0x12, 0xaf, 0xe1, 0xd0, 0xb4, 0x61, 0xb4, 0x13, 0x9d, 0x10, 0x3f, 0x83, 0xbc, 0xb2, 0x43, 0x47,
-	0x61, 0x30, 0xa6, 0x23, 0x18, 0x59, 0xbf, 0xed, 0x2a, 0x0c, 0x63, 0x31, 0x1d, 0x81, 0xfc, 0x93,
-	0x41, 0xa1, 0xb1, 0xb2, 0xae, 0xfe, 0xff, 0x10, 0xec, 0xfe, 0x21, 0xce, 0x20, 0xbf, 0x35, 0x37,
-	0x03, 0x86, 0xb7, 0x16, 0x3a, 0x02, 0xfe, 0x16, 0x4e, 0x5a, 0x24, 0x53, 0x1b, 0x32, 0x82, 0x9d,
-	0xb3, 0xf2, 0xf4, 0xe2, 0xa9, 0x8a, 0x76, 0xea, 0x6b, 0xe2, 0x3f, 0x77, 0xe4, 0x76, 0xfa, 0x9f,
-	0x6c, 0xfd, 0x11, 0x96, 0x93, 0x16, 0x7f, 0x02, 0xec, 0x07, 0xee, 0xd2, 0x72, 0x63, 0xf9, 0xf0,
-	0x5b, 0x1f, 0xe6, 0xef, 0xb3, 0x8b, 0x5f, 0x90, 0x7f, 0x1a, 0xc3, 0xc4, 0x5f, 0x41, 0x11, 0xb3,
-	0xc1, 0x57, 0x6a, 0x92, 0xa7, 0xf5, 0x63, 0x35, 0x0d, 0x8d, 0x9c, 0xf1, 0x12, 0xf2, 0xf0, 0xe7,
-	0x7c, 0xa9, 0xee, 0xc7, 0x64, 0xbd, 0x52, 0x93, 0x28, 0xc8, 0x19, 0x7f, 0x01, 0xec, 0xd2, 0x36,
-	0xfc, 0x54, 0xdd, 0x7d, 0xc0, 0xfa, 0x38, 0x6d, 0x24, 0x67, 0x6f, 0xb2, 0xab, 0x22, 0xa4, 0xf8,
-	0xdd, 0xdf, 0x00, 0x00, 0x00, 0xff, 0xff, 0xea, 0xdf, 0xa5, 0x1d, 0xf7, 0x02, 0x00, 0x00,
+	// 554 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xa4, 0x54, 0xcd, 0x6e, 0xd4, 0x30,
+	0x10, 0xde, 0x24, 0x9b, 0xdd, 0xcd, 0xb4, 0x09, 0xc8, 0xfc, 0x28, 0x0a, 0x08, 0x2a, 0x9f, 0x16,
+	0x01, 0x5e, 0x28, 0x17, 0x04, 0x57, 0x90, 0x38, 0x94, 0x8b, 0xcb, 0x0b, 0xb8, 0x89, 0x95, 0x06,
+	0x9a, 0x38, 0xd8, 0x4e, 0xa5, 0x7d, 0x24, 0x6e, 0xbc, 0x0c, 0x6f, 0xc3, 0x01, 0xf9, 0x27, 0xdb,
+	0x44, 0x08, 0xf5, 0xc0, 0xcd, 0xdf, 0xe7, 0x99, 0x2f, 0x33, 0x9f, 0x67, 0x02, 0xa4, 0x6d, 0x4a,
+	0x29, 0x76, 0xb5, 0x78, 0xe9, 0x0e, 0x15, 0xbf, 0x18, 0xea, 0x9d, 0xe2, 0xf2, 0xba, 0x29, 0xf9,
+	0xae, 0x97, 0x42, 0x7b, 0x8e, 0xd8, 0x33, 0x7e, 0x06, 0xe9, 0x27, 0xce, 0xae, 0xf4, 0x25, 0xe5,
+	0xdf, 0x07, 0xae, 0x34, 0xca, 0x61, 0xed, 0xa3, 0xf3, 0xe0, 0x24, 0xd8, 0x26, 0x74, 0x84, 0x78,
+	0x0b, 0xd9, 0x18, 0xaa, 0x7a, 0xd1, 0x29, 0x8e, 0x1e, 0xc2, 0x4a, 0x69, 0xa6, 0x07, 0xe5, 0x43,
+	0x3d, 0xc2, 0x5b, 0x38, 0x3e, 0xd7, 0x4c, 0xab, 0xdb, 0x35, 0x7f, 0x05, 0x90, 0xfa, 0x50, 0xaf,
+	0xf9, 0x18, 0x12, 0xdd, 0xb4, 0x5c, 0x69, 0xd6, 0xf6, 0x36, 0x7a, 0x49, 0x6f, 0x08, 0xab, 0xa4,
+	0x99, 0xd4, 0xbc, 0xca, 0x43, 0x7b, 0x37, 0x42, 0x53, 0xcb, 0xd0, 0x9b, 0xc0, 0x3c, 0xb2, 0x17,
+	0x1e, 0x19, 0xbe, 0xe5, 0xad, 0x90, 0xfb, 0x7c, 0xe9, 0x78, 0x87, 0x8c, 0x92, 0xbe, 0x94, 0x9c,
+	0x55, 0x2a, 0x8f, 0x9d, 0x92, 0x87, 0x28, 0x83, 0xb0, 0x2e, 0xf3, 0x95, 0x25, 0xc3, 0xba, 0x44,
+	0x05, 0x6c, 0xa4, 0x6b, 0x44, 0xe5, 0x6b, 0xcb, 0x1e, 0xb0, 0x51, 0xe7, 0x52, 0x0a, 0xa9, 0xf2,
+	0x8d, 0x53, 0x77, 0x08, 0x7f, 0x05, 0x38, 0x13, 0xf5, 0xad, 0xfd, 0x3b, 0x07, 0x25, 0x67, 0xad,
+	0x6d, 0x67, 0x43, 0x3d, 0x42, 0xf7, 0x21, 0x2e, 0xc5, 0xd0, 0x69, 0xdb, 0x4c, 0x44, 0x1d, 0x30,
+	0xac, 0x6a, 0xba, 0x92, 0xdb, 0x56, 0x22, 0xea, 0x00, 0xfe, 0x19, 0xc0, 0x8a, 0xf2, 0x52, 0xc8,
+	0xea, 0x6f, 0xf3, 0xa2, 0xa9, 0x79, 0xaf, 0x61, 0xd3, 0x72, 0xcd, 0x2a, 0xa6, 0x59, 0x1e, 0x9e,
+	0x44, 0xdb, 0xa3, 0xd3, 0x07, 0xc4, 0x25, 0x92, 0xcf, 0x9e, 0xff, 0xd8, 0x69, 0xb9, 0xa7, 0x87,
+	0x30, 0x53, 0x79, 0xcb, 0x95, 0x62, 0xb5, 0xb3, 0x35, 0xa1, 0x23, 0x2c, 0xde, 0x43, 0x3a, 0x4b,
+	0x42, 0x77, 0x21, 0xfa, 0xc6, 0xf7, 0xbe, 0x41, 0x73, 0x34, 0xe5, 0x5e, 0xb3, 0xab, 0x81, 0xdb,
+	0xde, 0x12, 0xea, 0xc0, 0xbb, 0xf0, 0x6d, 0x80, 0x9f, 0xc0, 0xf1, 0x17, 0xc9, 0x4a, 0x3e, 0x1a,
+	0x94, 0x41, 0xd8, 0x54, 0x3e, 0x35, 0x6c, 0x2a, 0xfc, 0x02, 0x52, 0x7f, 0xef, 0xa7, 0xe2, 0x11,
+	0xc4, 0xaa, 0x67, 0x9d, 0x19, 0x34, 0x53, 0x77, 0x4c, 0xce, 0x7b, 0xd6, 0x51, 0xc7, 0xe1, 0xdf,
+	0x01, 0x2c, 0x0d, 0x36, 0x1f, 0xd4, 0x26, 0xcd, 0x2b, 0x39, 0xe0, 0xc5, 0xc3, 0x51, 0xdc, 0x78,
+	0xde, 0x33, 0xc9, 0xbd, 0xb9, 0x09, 0xf5, 0x08, 0x21, 0x58, 0x76, 0xac, 0x75, 0xe6, 0x26, 0xd4,
+	0x9e, 0xa7, 0xf3, 0x16, 0xcf, 0xe7, 0xad, 0x80, 0x4d, 0x35, 0x48, 0xa6, 0x1b, 0xd1, 0xf9, 0x59,
+	0x39, 0x60, 0xb4, 0x9b, 0x18, 0xbd, 0xb6, 0x05, 0xdf, 0xb3, 0x05, 0xff, 0xcb, 0xe6, 0xff, 0x32,
+	0xf3, 0xf4, 0x47, 0x00, 0xf1, 0x07, 0xb3, 0xd2, 0xe8, 0x39, 0xac, 0xdc, 0x86, 0xa2, 0x8c, 0xcc,
+	0xb6, 0xba, 0xb8, 0x43, 0xe6, 0xab, 0x8b, 0x17, 0x68, 0x0b, 0xb1, 0xdd, 0x3c, 0x94, 0x92, 0xe9,
+	0xb2, 0x16, 0x19, 0x99, 0x2d, 0x24, 0x5e, 0xa0, 0xa7, 0x10, 0x9d, 0x89, 0x1a, 0x1d, 0x91, 0x9b,
+	0x91, 0x2e, 0xd6, 0x7e, 0x72, 0xf0, 0xe2, 0x55, 0x60, 0xa4, 0xec, 0x73, 0xa1, 0x94, 0x4c, 0x9f,
+	0xb5, 0xc8, 0xc8, 0xec, 0x15, 0xf1, 0xe2, 0x62, 0x65, 0xff, 0x3a, 0x6f, 0xfe, 0x04, 0x00, 0x00,
+	0xff, 0xff, 0x02, 0xa2, 0x4d, 0xc9, 0xa7, 0x04, 0x00, 0x00,
 }

debug/service/proto/debug.pb.micro.go

@@ -37,6 +37,7 @@ type DebugService interface {
 	Health(ctx context.Context, in *HealthRequest, opts ...client.CallOption) (*HealthResponse, error)
 	Stats(ctx context.Context, in *StatsRequest, opts ...client.CallOption) (*StatsResponse, error)
 	Log(ctx context.Context, in *LogRequest, opts ...client.CallOption) (Debug_LogService, error)
+	Trace(ctx context.Context, in *TraceRequest, opts ...client.CallOption) (*TraceResponse, error)
 }
 
 type debugService struct {
@@ -121,12 +122,23 @@ func (x *debugServiceLog) Recv() (*Record, error) {
 	return m, nil
 }
 
+func (c *debugService) Trace(ctx context.Context, in *TraceRequest, opts ...client.CallOption) (*TraceResponse, error) {
+	req := c.c.NewRequest(c.name, "Debug.Trace", in)
+	out := new(TraceResponse)
+	err := c.c.Call(ctx, req, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // Server API for Debug service
 
 type DebugHandler interface {
 	Health(context.Context, *HealthRequest, *HealthResponse) error
 	Stats(context.Context, *StatsRequest, *StatsResponse) error
 	Log(context.Context, *LogRequest, Debug_LogStream) error
+	Trace(context.Context, *TraceRequest, *TraceResponse) error
 }
 
 func RegisterDebugHandler(s server.Server, hdlr DebugHandler, opts ...server.HandlerOption) error {
@@ -134,6 +146,7 @@ func RegisterDebugHandler(s server.Server, hdlr DebugHandler, opts ...server.Han
 		Health(ctx context.Context, in *HealthRequest, out *HealthResponse) error
 		Stats(ctx context.Context, in *StatsRequest, out *StatsResponse) error
 		Log(ctx context.Context, stream server.Stream) error
+		Trace(ctx context.Context, in *TraceRequest, out *TraceResponse) error
 	}
 	type Debug struct {
 		debug
@@ -188,3 +201,7 @@ func (x *debugLogStream) RecvMsg(m interface{}) error {
 func (x *debugLogStream) Send(m *Record) error {
 	return x.stream.Send(m)
 }
+
+func (h *debugHandler) Trace(ctx context.Context, in *TraceRequest, out *TraceResponse) error {
+	return h.DebugHandler.Trace(ctx, in, out)
+}

debug/service/proto/debug.proto

@@ -4,6 +4,7 @@ service Debug {
         rpc Health(HealthRequest) returns (HealthResponse) {};
         rpc Stats(StatsRequest) returns (StatsResponse) {};
         rpc Log(LogRequest) returns (stream Record) {};
+	rpc Trace(TraceRequest) returns (TraceResponse) {};
 }
 
 message HealthRequest {
@@ -34,6 +35,10 @@ message StatsResponse {
 	uint64 threads = 5;
 	// total gc in nanoseconds
 	uint64 gc = 6;
+	// total number of requests
+	uint64 requests = 7;
+	// total number of errors
+	uint64 errors = 8;
 }
 
 // LogRequest requests service logs
@@ -54,8 +59,35 @@ message LogRequest {
 message Record {
         // timestamp of log record
         int64 timestamp = 1;
-        // record value
-        string value = 2;
         // record metadata
-        map<string,string> metadata = 3;
+        map<string,string> metadata = 2;
+        // message
+        string message = 3;
+}
+
+message TraceRequest {
+	// trace id to retrieve
+	string id = 1;
+}
+
+message TraceResponse {
+	repeated Span spans = 1;
+}
+
+
+message Span {
+	// the trace id
+	string trace = 1;
+	// id of the span
+	string id = 2;
+	// parent span
+	string parent = 3;
+	// name of the resource
+	string name = 4;
+	// time of start in nanoseconds
+	uint64 started = 5;
+	// duration of the execution in nanoseconds
+	uint64 duration = 6;
+	// associated metadata
+	map<string,string> metadata = 7;
 }

debug/service/service.go

@@ -1,86 +1,64 @@
 package service
 
 import (
-	"context"
-	"fmt"
 	"time"
 
-	"github.com/micro/go-micro/client"
-
+	"github.com/micro/go-micro/debug"
 	"github.com/micro/go-micro/debug/log"
-	pb "github.com/micro/go-micro/debug/service/proto"
 )
 
-// Debug provides debug service client
-type Debug struct {
-	dbg pb.DebugService
+type serviceLog struct {
+	Client *debugClient
 }
 
-// NewDebug provides Debug service implementation
-func NewDebug(name string) *Debug {
-	// create default client
-	cli := client.DefaultClient
-
-	return &Debug{
-		dbg: pb.NewDebugService(name, cli),
-	}
-}
-
-// Logs queries the service logs and returns a channel to read the logs from
-func (d *Debug) Log(opts ...log.ReadOption) (<-chan log.Record, error) {
-	options := log.ReadOptions{}
-	// initialize the read options
+// Read reads log entries from the logger
+func (s *serviceLog) Read(opts ...log.ReadOption) ([]log.Record, error) {
+	var options log.ReadOptions
 	for _, o := range opts {
 		o(&options)
 	}
 
-	req := &pb.LogRequest{}
-	if !options.Since.IsZero() {
-		req.Since = options.Since.Unix()
-	}
-
-	if options.Count > 0 {
-		req.Count = int64(options.Count)
-	}
-
-	req.Stream = options.Stream
-
-	// get the log stream
-	stream, err := d.dbg.Log(context.Background(), req)
+	stream, err := s.Client.Log(options.Since, options.Count, false)
 	if err != nil {
-		return nil, fmt.Errorf("failed getting log stream: %s", err)
+		return nil, err
+	}
+	defer stream.Stop()
+
+	// stream the records until nothing is left
+	var records []log.Record
+
+	for record := range stream.Chan() {
+		records = append(records, record)
 	}
 
-	// log channel for streaming logs
-	logChan := make(chan log.Record)
-	// go stream logs
-	go d.streamLogs(logChan, stream)
-
-	return logChan, nil
+	return records, nil
 }
 
-func (d *Debug) streamLogs(logChan chan log.Record, stream pb.Debug_LogService) {
-	defer stream.Close()
+// There is no write support
+func (s *serviceLog) Write(r log.Record) error {
+	return nil
+}
 
-	for {
-		resp, err := stream.Recv()
-		if err != nil {
-			break
-		}
+// Stream log records
+func (s *serviceLog) Stream() (log.Stream, error) {
+	return s.Client.Log(time.Time{}, 0, true)
+}
 
-		metadata := make(map[string]string)
-		for k, v := range resp.Metadata {
-			metadata[k] = v
-		}
-
-		record := log.Record{
-			Timestamp: time.Unix(resp.Timestamp, 0),
-			Value:     resp.Value,
-			Metadata:  metadata,
-		}
-
-		logChan <- record
+// NewLog returns a new log interface
+func NewLog(opts ...log.Option) log.Log {
+	var options log.Options
+	for _, o := range opts {
+		o(&options)
 	}
 
-	close(logChan)
+	name := options.Name
+
+	// set the default name
+	if len(name) == 0 {
+		name = debug.DefaultName
+	}
+
+	return &serviceLog{
+		Client: NewClient(name),
+	}
 }

debug/service/stream.go

@@ -0,0 +1,25 @@
+package service
+
+import (
+	"github.com/micro/go-micro/debug/log"
+)
+
+type logStream struct {
+	stream chan log.Record
+	stop   chan bool
+}
+
+func (l *logStream) Chan() <-chan log.Record {
+	return l.stream
+}
+
+func (l *logStream) Stop() error {
+	select {
+	case <-l.stop:
+		return nil
+	default:
+		close(l.stream)
+		close(l.stop)
+	}
+	return nil
+}

debug/stats/default.go

@@ -1,18 +1,50 @@
 package stats
 
 import (
-	"github.com/micro/go-micro/debug/buffer"
+	"runtime"
+	"sync"
+	"time"
+
+	"github.com/micro/go-micro/util/ring"
 )
 
 type stats struct {
-	buffer *buffer.Buffer
+	// used to store past stats
+	buffer *ring.Buffer
+
+	sync.RWMutex
+	started  int64
+	requests uint64
+	errors   uint64
+}
+
+func (s *stats) snapshot() *Stat {
+	s.RLock()
+	defer s.RUnlock()
+
+	var mstat runtime.MemStats
+	runtime.ReadMemStats(&mstat)
+
+	now := time.Now().Unix()
+
+	return &Stat{
+		Timestamp: now,
+		Started:   s.started,
+		Uptime:    now - s.started,
+		Memory:    mstat.Alloc,
+		GC:        mstat.PauseTotalNs,
+		Threads:   uint64(runtime.NumGoroutine()),
+		Requests:  s.requests,
+		Errors:    s.errors,
+	}
 }
 
 func (s *stats) Read() ([]*Stat, error) {
 	// TODO adjustable size and optional read values
-	buf := s.buffer.Get(1)
+	buf := s.buffer.Get(60)
 	var stats []*Stat
 
+	// get a value from the buffer if it exists
 	for _, b := range buf {
 		stat, ok := b.Value.(*Stat)
 		if !ok {
@@ -21,6 +53,9 @@ func (s *stats) Read() ([]*Stat, error) {
 		stats = append(stats, stat)
 	}
 
+	// get a snapshot
+	stats = append(stats, s.snapshot())
+
 	return stats, nil
 }
 
@@ -29,10 +64,26 @@ func (s *stats) Write(stat *Stat) error {
 	return nil
 }
 
+func (s *stats) Record(err error) error {
+	s.Lock()
+	defer s.Unlock()
+
+	// increment the total request count
+	s.requests++
+
+	// increment the error count
+	if err != nil {
+		s.errors++
+	}
+
+	return nil
+}
+
 // NewStats returns a new in memory stats buffer
 // TODO add options
 func NewStats() Stats {
 	return &stats{
-		buffer: buffer.New(1024),
+		started: time.Now().Unix(),
+		buffer:  ring.New(60),
 	}
 }

debug/stats/stats.go

@@ -7,6 +7,8 @@ type Stats interface {
 	Read() ([]*Stat, error)
 	// Write a stat snapshot
 	Write(*Stat) error
+	// Record a request
+	Record(error) error
 }
 
 // A runtime stat
@@ -23,4 +25,12 @@ type Stat struct {
 	Threads uint64
 	// Garbage collection in nanoseconds
 	GC uint64
+	// Total requests
+	Requests uint64
+	// Total errors
+	Errors uint64
 }
+
+var (
+	DefaultStats = NewStats()
+)

debug/trace/memory/memory.go

@@ -0,0 +1,90 @@
+package memory
+
+import (
+	"context"
+	"time"
+
+	"github.com/google/uuid"
+	"github.com/micro/go-micro/debug/trace"
+	"github.com/micro/go-micro/util/ring"
+)
+
+type Tracer struct {
+	opts trace.Options
+
+	// ring buffer of traces
+	buffer *ring.Buffer
+}
+
+func (t *Tracer) Read(opts ...trace.ReadOption) ([]*trace.Span, error) {
+	var options trace.ReadOptions
+	for _, o := range opts {
+		o(&options)
+	}
+
+	sp := t.buffer.Get(t.buffer.Size())
+
+	var spans []*trace.Span
+
+	for _, span := range sp {
+		val := span.Value.(*trace.Span)
+		// skip if trace id is specified and doesn't match
+		if len(options.Trace) > 0 && val.Trace != options.Trace {
+			continue
+		}
+		spans = append(spans, val)
+	}
+
+	return spans, nil
+}
+
+func (t *Tracer) Start(ctx context.Context, name string) (context.Context, *trace.Span) {
+	span := &trace.Span{
+		Name:     name,
+		Trace:    uuid.New().String(),
+		Id:       uuid.New().String(),
+		Started:  time.Now(),
+		Metadata: make(map[string]string),
+	}
+
+	// return span if no context
+	if ctx == nil {
+		return context.Background(), span
+	}
+
+	s, ok := trace.FromContext(ctx)
+	if !ok {
+		return ctx, span
+	}
+
+	// set trace id
+	span.Trace = s.Trace
+	// set parent
+	span.Parent = s.Id
+
+	// return the sapn
+	return ctx, span
+}
+
+func (t *Tracer) Finish(s *trace.Span) error {
+	// set finished time
+	s.Duration = time.Since(s.Started)
+
+	// save the span
+	t.buffer.Put(s)
+
+	return nil
+}
+
+func NewTracer(opts ...trace.Option) trace.Tracer {
+	var options trace.Options
+	for _, o := range opts {
+		o(&options)
+	}
+
+	return &Tracer{
+		opts: options,
+		// the last 64 requests
+		buffer: ring.New(64),
+	}
+}

debug/trace/options.go

@@ -0,0 +1,34 @@
+package trace
+
+type Options struct {
+	// Size is the size of ring buffer
+	Size int
+}
+
+type Option func(o *Options)
+
+type ReadOptions struct {
+	// Trace id
+	Trace string
+}
+
+type ReadOption func(o *ReadOptions)
+
+// Read the given trace
+func ReadTrace(t string) ReadOption {
+	return func(o *ReadOptions) {
+		o.Trace = t
+	}
+}
+
+const (
+	// DefaultSize of the buffer
+	DefaultSize = 64
+)
+
+// DefaultOptions returns default options
+func DefaultOptions() Options {
+	return Options{
+		Size: DefaultSize,
+	}
+}

debug/trace/trace.go

@@ -0,0 +1,70 @@
+// Package trace provides an interface for distributed tracing
+package trace
+
+import (
+	"context"
+	"time"
+)
+
+// Tracer is an interface for distributed tracing
+type Tracer interface {
+	// Start a trace
+	Start(ctx context.Context, name string) (context.Context, *Span)
+	// Finish the trace
+	Finish(*Span) error
+	// Read the traces
+	Read(...ReadOption) ([]*Span, error)
+}
+
+// Span is used to record an entry
+type Span struct {
+	// Id of the trace
+	Trace string
+	// name of the span
+	Name string
+	// id of the span
+	Id string
+	// parent span id
+	Parent string
+	// Start time
+	Started time.Time
+	// Duration in nano seconds
+	Duration time.Duration
+	// associated data
+	Metadata map[string]string
+}
+
+type spanKey struct{}
+
+// FromContext returns a span from context
+func FromContext(ctx context.Context) (*Span, bool) {
+	s, ok := ctx.Value(spanKey{}).(*Span)
+	return s, ok
+}
+
+// NewContext creates a new context with the span
+func NewContext(ctx context.Context, s *Span) context.Context {
+	return context.WithValue(ctx, spanKey{}, s)
+}
+
+var (
+	DefaultTracer Tracer = new(noop)
+)
+
+type noop struct{}
+
+func (n *noop) Init(...Option) error {
+	return nil
+}
+
+func (n *noop) Start(ctx context.Context, name string) (context.Context, *Span) {
+	return nil, nil
+}
+
+func (n *noop) Finish(*Span) error {
+	return nil
+}
+
+func (n *noop) Read(...ReadOption) ([]*Span, error) {
+	return nil, nil
+}

defaults.go

@@ -0,0 +1,25 @@
+package micro
+
+import (
+	"github.com/micro/go-micro/client"
+	"github.com/micro/go-micro/debug/trace"
+	"github.com/micro/go-micro/server"
+	"github.com/micro/go-micro/store"
+
+	// set defaults
+	gcli "github.com/micro/go-micro/client/grpc"
+	memTrace "github.com/micro/go-micro/debug/trace/memory"
+	gsrv "github.com/micro/go-micro/server/grpc"
+	memStore "github.com/micro/go-micro/store/memory"
+)
+
+func init() {
+	// default client
+	client.DefaultClient = gcli.NewClient()
+	// default server
+	server.DefaultServer = gsrv.NewServer()
+	// default store
+	store.DefaultStore = memStore.NewStore()
+	// set default trace
+	trace.DefaultTracer = memTrace.NewTracer()
+}

event.go

@@ -0,0 +1,16 @@
+package micro
+
+import (
+	"context"
+
+	"github.com/micro/go-micro/client"
+)
+
+type event struct {
+	c     client.Client
+	topic string
+}
+
+func (e *event) Publish(ctx context.Context, msg interface{}, opts ...client.PublishOption) error {
+	return e.c.Publish(ctx, e.c.NewMessage(e.topic, msg), opts...)
+}

go.mod

@@ -6,43 +6,58 @@ require (
 	github.com/BurntSushi/toml v0.3.1
 	github.com/beevik/ntp v0.2.0
 	github.com/bitly/go-simplejson v0.5.0
-	github.com/bwmarrin/discordgo v0.20.1
-	github.com/coreos/etcd v3.3.17+incompatible
+	github.com/bmizerany/assert v0.0.0-20160611221934-b7ed37b82869 // indirect
+	github.com/bwmarrin/discordgo v0.20.2
+	github.com/coreos/bbolt v1.3.3 // indirect
+	github.com/coreos/etcd v3.3.18+incompatible
+	github.com/coreos/go-semver v0.3.0 // 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 v1.6.0
 	github.com/ghodss/yaml v1.0.0
-	github.com/go-acme/lego/v3 v3.1.0
-	github.com/go-log/log v0.1.0
-	github.com/go-playground/locales v0.13.0 // indirect
+	github.com/go-acme/lego/v3 v3.3.0
+	github.com/go-playground/universal-translator v0.17.0 // indirect
+	github.com/go-telegram-bot-api/telegram-bot-api v4.6.4+incompatible // indirect
+	github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e // indirect
 	github.com/golang/protobuf v1.3.2
 	github.com/google/uuid v1.1.1
 	github.com/gorilla/handlers v1.4.2
 	github.com/gorilla/websocket v1.4.1
+	github.com/grpc-ecosystem/go-grpc-middleware v1.1.0 // indirect
+	github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0 // indirect
 	github.com/hashicorp/hcl v1.0.0
 	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 v1.1.8
+	github.com/json-iterator/go v1.1.9
 	github.com/kr/pretty v0.1.0
 	github.com/leodido/go-urn v1.2.0 // indirect
-	github.com/lib/pq v1.2.0
-	github.com/lucas-clemente/quic-go v0.13.1
-	github.com/mholt/certmagic v0.8.3
-	github.com/micro/cli v0.2.0
+	github.com/lib/pq v1.3.0
+	github.com/lucas-clemente/quic-go v0.14.1
+	github.com/mholt/certmagic v0.9.1
+	github.com/micro/cli/v2 v2.1.1
 	github.com/micro/mdns v0.3.0
-	github.com/micro/protoc-gen-micro v1.0.0 // indirect
-	github.com/miekg/dns v1.1.22
+	github.com/miekg/dns v1.1.27
 	github.com/mitchellh/hashstructure v1.0.0
+	github.com/nats-io/nats-server/v2 v2.1.2
 	github.com/nats-io/nats.go v1.9.1
-	github.com/nlopes/slack v0.6.0
+	github.com/nlopes/slack v0.6.1-0.20191106133607-d06c2a2b3249
 	github.com/oxtoacart/bpool v0.0.0-20190530202638-03653db5a59c
-	github.com/pkg/errors v0.8.1
+	github.com/pkg/errors v0.9.1
+	github.com/soheilhy/cmux v0.1.4 // indirect
 	github.com/stretchr/testify v1.4.0
-	go.uber.org/zap v1.12.0 // indirect
-	golang.org/x/crypto v0.0.0-20191108234033-bd318be0434a
-	golang.org/x/net v0.0.0-20191109021931-daa7c04131f5
-	google.golang.org/grpc v1.25.1
-	gopkg.in/go-playground/validator.v9 v9.30.0
+	github.com/technoweenie/multipartstreamer v1.0.1 // indirect
+	github.com/tmc/grpc-websocket-proxy v0.0.0-20200122045848-3419fae592fc // indirect
+	github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2 // indirect
+	go.etcd.io/bbolt v1.3.3 // indirect
+	go.uber.org/zap v1.13.0
+	golang.org/x/crypto v0.0.0-20200117160349-530e935923ad
+	golang.org/x/net v0.0.0-20200114155413-6afb5195e5aa
+	google.golang.org/grpc v1.26.0
+	gopkg.in/go-playground/assert.v1 v1.2.1 // indirect
+	gopkg.in/go-playground/validator.v9 v9.31.0
 	gopkg.in/src-d/go-git.v4 v4.13.1
 	gopkg.in/telegram-bot-api.v4 v4.6.4
+	sigs.k8s.io/yaml v1.1.0 // indirect
 )

go.sum

@@ -1,8 +1,19 @@
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
+cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
+cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
+cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
+cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
+cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
+cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
+cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
+cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
 contrib.go.opencensus.io/exporter/ocagent v0.4.12/go.mod h1:450APlNTSR6FrvC3CTRqYosuDstRB9un7SOx2k/9ckA=
+dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 github.com/Azure/azure-sdk-for-go v32.4.0+incompatible/go.mod h1:9XXNKU+eRnpl9moKnB4QOLf1HestfXbmab5FXxiDBjc=
+github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78 h1:w+iIsaOQNcT7OZ575w+acHgRric5iCyQh+xv+KJ4HB8=
 github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78/go.mod h1:LmzpDX56iTiv29bbRTIsUNlaFfuhWRQBWjQdVyAevI8=
 github.com/Azure/go-autorest/autorest v0.1.0/go.mod h1:AKyIcETwSUFxIcs/Wnq/C+kwCtlEYGUVd7FPNb2slmg=
 github.com/Azure/go-autorest/autorest v0.5.0/go.mod h1:9HLKlQjVBH6U3oDfsXOeVc56THsLPw1L03yban4xThw=
@@ -18,22 +29,27 @@ github.com/Azure/go-autorest/logger v0.1.0/go.mod h1:oExouG+K6PryycPJfVSxi/koC6L
 github.com/Azure/go-autorest/tracing v0.1.0/go.mod h1:ROEEAFwXycQw7Sn3DXNtEedEvdeRAgDr0izn4z5Ij88=
 github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/Microsoft/go-winio v0.4.14/go.mod h1:qXqCSQ3Xa7+6tgxaGTIe4Kpcdsi+P8jBhyzoq1bpyYA=
+github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
+github.com/Microsoft/go-winio v0.4.15-0.20190919025122-fc70bd9a86b5 h1:ygIc8M6trr62pF5DucadTWGdEB4mEyvzi0e2nbcmcyA=
 github.com/Microsoft/go-winio v0.4.15-0.20190919025122-fc70bd9a86b5/go.mod h1:tTuCMEN+UleMWgg9dVx4Hu52b1bJo+59jBh3ajtinzw=
-github.com/Microsoft/hcsshim v0.8.6/go.mod h1:Op3hHsoHPAvb6lceZHDtd9OkTew38wNoXnJs8iY7rUg=
+github.com/Microsoft/hcsshim v0.8.7-0.20191101173118-65519b62243c h1:YMP6olTU903X3gxQJckdmiP8/zkSMq4kN3uipsU9XjU=
 github.com/Microsoft/hcsshim v0.8.7-0.20191101173118-65519b62243c/go.mod h1:7xhjOwRV2+0HXGmM0jxaEu+ZiXJFoVZOTfL/dmqbrD8=
 github.com/OpenDNS/vegadns2client v0.0.0-20180418235048-a3fa4a771d87/go.mod h1:iGLljf5n9GjT6kc0HBvyI1nOKnGQbNB66VzSNbK5iks=
 github.com/Shopify/sarama v1.19.0/go.mod h1:FVkBWblsNy7DGZRfXLU0O9RCGt5g3g3yEuWXgklEdEo=
 github.com/Shopify/toxiproxy v2.1.4+incompatible/go.mod h1:OXgGpZ6Cli1/URJOF1DMxUHB2q5Ap20/P/eIdh4G0pI=
 github.com/akamai/AkamaiOPEN-edgegrid-golang v0.9.0/go.mod h1:zpDJeKyp9ScW4NNrbdr+Eyxvry3ilGPewKoXw3XGN1k=
+github.com/alangpierce/go-forceexport v0.0.0-20160317203124-8f1d6941cd75 h1:3ILjVyslFbc4jl1w5TWuvvslFD/nDfR2H8tVaMVLrEY=
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@@ -174,13 +199,17 @@ github.com/gorilla/context v1.1.1/go.mod h1:kBGZzfjB9CEq2AlWe17Uuf7NDRt0dE0s8S51
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@@ -357,12 +392,12 @@ github.com/sirupsen/logrus v1.4.2/go.mod h1:tLMulIdttU9McNUspp0xgXVQah82FyeX6Mwd
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@@ -372,7 +407,8 @@ github.com/syndtr/gocapability v0.0.0-20170704070218-db04d3cc01c8/go.mod h1:hkRG
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@@ -384,7 +420,9 @@ github.com/xeipuuv/gojsonpointer v0.0.0-20180127040702-4e3ac2762d5f/go.mod h1:N2
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@@ -395,41 +433,52 @@ go.uber.org/atomic v1.4.0/go.mod h1:gD2HeocX3+yG+ygLZcrzQJaqmWj9AIm7n08wl/qW/PE=
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@@ -503,49 +552,69 @@ golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGm
 golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
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-gopkg.in/go-playground/validator.v9 v9.30.0 h1:Wk0Z37oBmKj9/n+tPyBHZmeL19LaCoK3Qq48VwYENss=
-gopkg.in/go-playground/validator.v9 v9.30.0/go.mod h1:+c9/zcJMFNgbLvly1L1V+PpxWdVbfP1avr/N00E2vyQ=
+gopkg.in/go-playground/validator.v9 v9.31.0 h1:bmXmP2RSNtFES+bn4uYuHT7iJFJv7Vj+an+ZQdDaD1M=
+gopkg.in/go-playground/validator.v9 v9.31.0/go.mod h1:+c9/zcJMFNgbLvly1L1V+PpxWdVbfP1avr/N00E2vyQ=
 gopkg.in/h2non/gock.v1 v1.0.15/go.mod h1:sX4zAkdYX1TRGJ2JY156cFspQn4yRWn6p9EMdODlynE=
 gopkg.in/ini.v1 v1.42.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
 gopkg.in/ini.v1 v1.44.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
@@ -556,11 +625,13 @@ gopkg.in/square/go-jose.v2 v2.3.1 h1:SK5KegNXmKmqE342YYN2qPHEnUYeoMiXXl1poUlI+o4
 gopkg.in/square/go-jose.v2 v2.3.1/go.mod h1:M9dMgbHiYLoDGQrXy7OpJDJWiKiU//h+vD76mk0e1AI=
 gopkg.in/src-d/go-billy.v4 v4.3.2 h1:0SQA1pRztfTFx2miS8sA97XvooFeNOmvUenF4o0EcVg=
 gopkg.in/src-d/go-billy.v4 v4.3.2/go.mod h1:nDjArDMp+XMs1aFAESLRjfGSgfvoYN0hDfzEk0GjC98=
+gopkg.in/src-d/go-git-fixtures.v3 v3.5.0 h1:ivZFOIltbce2Mo8IjzUHAFoq/IylO9WHhNOAJK+LsJg=
 gopkg.in/src-d/go-git-fixtures.v3 v3.5.0/go.mod h1:dLBcvytrw/TYZsNTWCnkNF2DSIlzWYqTe3rJR56Ac7g=
 gopkg.in/src-d/go-git.v4 v4.13.1 h1:SRtFyV8Kxc0UP7aCHcijOMQGPxHSmMOPrzulQWolkYE=
 gopkg.in/src-d/go-git.v4 v4.13.1/go.mod h1:nx5NYcxdKxq5fpltdHnPa2Exj4Sx0EclMWZQbYDu2z8=
 gopkg.in/telegram-bot-api.v4 v4.6.4 h1:hpHWhzn4jTCsAJZZ2loNKfy2QWyPDRJVl3aTFXeMW8g=
 gopkg.in/telegram-bot-api.v4 v4.6.4/go.mod h1:5DpGO5dbumb40px+dXcwCpcjmeHNYLpk0bp3XRNvWDM=
+gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
 gopkg.in/warnings.v0 v0.1.2 h1:wFXVbFY8DY5/xOe1ECiWdKCzZlxgshcYVNkBHstARME=
 gopkg.in/warnings.v0 v0.1.2/go.mod h1:jksf8JmL6Qr/oQM2OXTHunEvvTAsrWBLb6OOjuVWRNI=
@@ -568,12 +639,16 @@ gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bl
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gotest.tools v2.2.0+incompatible h1:VsBPFP1AI068pPrMxtb/S8Zkgf9xEmTLJjfM+P5UIEo=
 gotest.tools v2.2.0+incompatible/go.mod h1:DsYFclhRJ6vuDpmuTbkuFWG+y2sxOXAzmJt81HFBacw=
 honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
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+honnef.co/go/tools v0.0.1-2019.2.3 h1:3JgtbtFHMiCmsznwGVTUWbgGov+pVqnlf1dEJTNAXeM=
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 k8s.io/kubernetes v1.13.0/go.mod h1:ocZa8+6APFNC2tX1DZASIbocyYT5jHzqFVsY5aoB7Jk=
+rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
+sigs.k8s.io/yaml v1.1.0 h1:4A07+ZFc2wgJwo8YNlQpr1rVlgUDlxXHhPJciaPY5gs=
 sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=

metadata/metadata.go

@@ -3,6 +3,7 @@ package metadata
 
 import (
 	"context"
+	"strings"
 )
 
 type metaKey struct{}
@@ -27,14 +28,32 @@ func Get(ctx context.Context, key string) (string, bool) {
 	if !ok {
 		return "", ok
 	}
+	// attempt to get as is
 	val, ok := md[key]
+	if ok {
+		return val, ok
+	}
+
+	// attempt to get lower case
+	val, ok = md[strings.Title(key)]
+
 	return val, ok
 }
 
 // FromContext returns metadata from the given context
 func FromContext(ctx context.Context) (Metadata, bool) {
 	md, ok := ctx.Value(metaKey{}).(Metadata)
-	return md, ok
+	if !ok {
+		return nil, ok
+	}
+
+	// capitalise all values
+	newMD := make(map[string]string)
+	for k, v := range md {
+		newMD[strings.Title(k)] = v
+	}
+
+	return newMD, ok
 }
 
 // NewContext creates a new context with the given metadata
@@ -57,5 +76,4 @@ func MergeContext(ctx context.Context, patchMd Metadata, overwrite bool) context
 		}
 	}
 	return context.WithValue(ctx, metaKey{}, cmd)
-
 }

metadata/metadata_test.go

@@ -8,7 +8,7 @@ import (
 
 func TestMetadataCopy(t *testing.T) {
 	md := Metadata{
-		"foo": "bar",
+		"Foo": "bar",
 		"bar": "baz",
 	}
 
@@ -23,7 +23,7 @@ func TestMetadataCopy(t *testing.T) {
 
 func TestMetadataContext(t *testing.T) {
 	md := Metadata{
-		"foo": "bar",
+		"Foo": "bar",
 	}
 
 	ctx := NewContext(context.TODO(), md)
@@ -33,8 +33,8 @@ func TestMetadataContext(t *testing.T) {
 		t.Errorf("Unexpected error retrieving metadata, got %t", ok)
 	}
 
-	if emd["foo"] != md["foo"] {
-		t.Errorf("Expected key: %s val: %s, got key: %s val: %s", "foo", md["foo"], "foo", emd["foo"])
+	if emd["Foo"] != md["Foo"] {
+		t.Errorf("Expected key: %s val: %s, got key: %s val: %s", "Foo", md["Foo"], "Foo", emd["Foo"])
 	}
 
 	if i := len(emd); i != 1 {
@@ -56,20 +56,20 @@ func TestMergeContext(t *testing.T) {
 		{
 			name: "matching key, overwrite false",
 			args: args{
-				existing:  Metadata{"foo": "bar", "sumo": "demo"},
-				append:    Metadata{"sumo": "demo2"},
+				existing:  Metadata{"Foo": "bar", "Sumo": "demo"},
+				append:    Metadata{"Sumo": "demo2"},
 				overwrite: false,
 			},
-			want: Metadata{"foo": "bar", "sumo": "demo"},
+			want: Metadata{"Foo": "bar", "Sumo": "demo"},
 		},
 		{
 			name: "matching key, overwrite true",
 			args: args{
-				existing:  Metadata{"foo": "bar", "sumo": "demo"},
-				append:    Metadata{"sumo": "demo2"},
+				existing:  Metadata{"Foo": "bar", "Sumo": "demo"},
+				append:    Metadata{"Sumo": "demo2"},
 				overwrite: true,
 			},
-			want: Metadata{"foo": "bar", "sumo": "demo2"},
+			want: Metadata{"Foo": "bar", "Sumo": "demo2"},
 		},
 	}
 	for _, tt := range tests {

micro.go

@@ -42,11 +42,35 @@ type Function interface {
 	Subscribe(topic string, v interface{}) error
 }
 
-// Publisher is syntactic sugar for publishing
-type Publisher interface {
+/*
+// Type Event is a future type for acting on asynchronous events
+type Event interface {
+	// Publish publishes a message to the event topic
+	Publish(ctx context.Context, msg interface{}, opts ...client.PublishOption) error
+	// Subscribe to the event
+	Subscribe(ctx context.Context, v in
+}
+
+// Resource is a future type for defining dependencies
+type Resource interface {
+	// Name of the resource
+	Name() string
+	// Type of resource
+	Type() string
+	// Method of creation
+	Create() error
+}
+*/
+
+// Event is used to publish messages to a topic
+type Event interface {
+	// Publish publishes a message to the event topic
 	Publish(ctx context.Context, msg interface{}, opts ...client.PublishOption) error
 }
 
+// Type alias to satisfy the deprecation
+type Publisher = Event
+
 type Option func(*Options)
 
 var (
@@ -74,12 +98,17 @@ func NewFunction(opts ...Option) Function {
 	return newFunction(opts...)
 }
 
-// NewPublisher returns a new Publisher
-func NewPublisher(topic string, c client.Client) Publisher {
+// NewEvent creates a new event publisher
+func NewEvent(topic string, c client.Client) Event {
 	if c == nil {
 		c = client.NewClient()
 	}
-	return &publisher{c, topic}
+	return &event{c, topic}
+}
+
+// Deprecated: NewPublisher returns a new Publisher
+func NewPublisher(topic string, c client.Client) Event {
+	return NewEvent(topic, c)
 }
 
 // RegisterHandler is syntactic sugar for registering a handler