Add pub/sub to client/server and make broker more low level

broker/broker.go

@@ -1,24 +1,19 @@
 package broker
 
-import (
-	"code.google.com/p/go-uuid/uuid"
-	"golang.org/x/net/context"
-)
-
 type Broker interface {
 	Address() string
 	Connect() error
 	Disconnect() error
 	Init() error
-	Publish(context.Context, string, []byte) error
+	Publish(string, *Message) error
-	Subscribe(string, func(context.Context, *Message)) (Subscriber, error)
+	Subscribe(string, Handler) (Subscriber, error)
 }
 
+type Handler func(*Message)
+
 type Message struct {
-	Id        string
+	Header map[string]string
-	Timestamp int64
+	Body   []byte
-	Topic     string
-	Body      []byte
 }
 
 type Subscriber interface {
@@ -31,24 +26,14 @@ type options struct{}
 type Option func(*options)
 
 var (
-	Address       string
+	DefaultBroker Broker = newHttpBroker([]string{})
-	Id            string
-	DefaultBroker Broker
 )
 
 func NewBroker(addrs []string, opt ...Option) Broker {
-	return newHttpBroker([]string{Address}, opt...)
+	return newHttpBroker(addrs, opt...)
 }
 
 func Init() error {
-	if len(Id) == 0 {
-		Id = "broker-" + uuid.NewUUID().String()
-	}
-
-	if DefaultBroker == nil {
-		DefaultBroker = newHttpBroker([]string{Address})
-	}
-
 	return DefaultBroker.Init()
 }
 
@@ -60,10 +45,10 @@ func Disconnect() error {
 	return DefaultBroker.Disconnect()
 }
 
-func Publish(ctx context.Context, topic string, body []byte) error {
+func Publish(topic string, msg *Message) error {
-	return DefaultBroker.Publish(ctx, topic, body)
+	return DefaultBroker.Publish(topic, msg)
 }
 
-func Subscribe(topic string, function func(context.Context, *Message)) (Subscriber, error) {
+func Subscribe(topic string, handler Handler) (Subscriber, error) {
-	return DefaultBroker.Subscribe(topic, function)
+	return DefaultBroker.Subscribe(topic, handler)
 }

broker/http_broker.go

@@ -7,21 +7,14 @@ import (
 	"io/ioutil"
 	"net"
 	"net/http"
-	"os"
-	"os/signal"
 	"strconv"
 	"strings"
 	"sync"
-	"syscall"
-	"time"
 
 	"code.google.com/p/go-uuid/uuid"
 	log "github.com/golang/glog"
-	c "github.com/myodc/go-micro/context"
 	"github.com/myodc/go-micro/errors"
 	"github.com/myodc/go-micro/registry"
-
-	"golang.org/x/net/context"
 )
 
 type httpBroker struct {
@@ -39,28 +32,22 @@ type httpSubscriber struct {
 	id    string
 	topic string
 	ch    chan *httpSubscriber
-	fn    func(context.Context, *Message)
+	fn    Handler
 	svc   *registry.Service
 }
 
-// used in brokers where there is no support for headers
-type envelope struct {
-	Header  map[string]string
-	Message *Message
-}
-
 var (
 	DefaultSubPath = "/_sub"
 )
 
 func newHttpBroker(addrs []string, opt ...Option) Broker {
 	addr := ":0"
-	if len(addrs) > 0 {
+	if len(addrs) > 0 && len(addrs[0]) > 0 {
 		addr = addrs[0]
 	}
 
 	return &httpBroker{
-		id:          Id,
+		id:          "broker-" + uuid.NewUUID().String(),
 		address:     addr,
 		subscribers: make(map[string][]*httpSubscriber),
 		unsubscribe: make(chan *httpSubscriber),
@@ -96,9 +83,6 @@ func (h *httpBroker) start() error {
 	go http.Serve(l, h)
 
 	go func() {
-		ce := make(chan os.Signal, 1)
-		signal.Notify(ce, syscall.SIGTERM, syscall.SIGINT, syscall.SIGKILL)
-
 		for {
 			select {
 			case ch := <-h.exit:
@@ -107,8 +91,6 @@ func (h *httpBroker) start() error {
 				h.running = false
 				h.Unlock()
 				return
-			case <-ce:
-				h.stop()
 			case subscriber := <-h.unsubscribe:
 				h.Lock()
 				var subscribers []*httpSubscriber
@@ -150,26 +132,27 @@ func (h *httpBroker) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 		return
 	}
 
-	var e *envelope
+	var m *Message
-	if err = json.Unmarshal(b, &e); err != nil {
+	if err = json.Unmarshal(b, &m); err != nil {
 		errr := errors.InternalServerError("go.micro.broker", fmt.Sprintf("Error parsing request body: %v", err))
 		w.WriteHeader(500)
 		w.Write([]byte(errr.Error()))
 		return
 	}
 
-	if len(e.Message.Topic) == 0 {
+	topic := m.Header[":topic"]
+	delete(m.Header, ":topic")
+
+	if len(topic) == 0 {
 		errr := errors.InternalServerError("go.micro.broker", "Topic not found")
 		w.WriteHeader(500)
 		w.Write([]byte(errr.Error()))
 		return
 	}
 
-	ctx := c.WithMetadata(context.Background(), e.Header)
-
 	h.RLock()
-	for _, subscriber := range h.subscribers[e.Message.Topic] {
+	for _, subscriber := range h.subscribers[topic] {
-		subscriber.fn(ctx, e.Message)
+		subscriber.fn(m)
 	}
 	h.RUnlock()
 }
@@ -195,26 +178,14 @@ func (h *httpBroker) Init() error {
 	return nil
 }
 
-func (h *httpBroker) Publish(ctx context.Context, topic string, body []byte) error {
+func (h *httpBroker) Publish(topic string, msg *Message) error {
 	s, err := registry.GetService("topic:" + topic)
 	if err != nil {
 		return err
 	}
 
-	message := &Message{
+	msg.Header[":topic"] = topic
-		Id:        uuid.NewUUID().String(),
+	b, err := json.Marshal(msg)
-		Timestamp: time.Now().Unix(),
-		Topic:     topic,
-		Body:      body,
-	}
-
-	header, _ := c.GetMetadata(ctx)
-
-	b, err := json.Marshal(&envelope{
-		header,
-		message,
-	})
-
 	if err != nil {
 		return err
 	}
@@ -229,7 +200,7 @@ func (h *httpBroker) Publish(ctx context.Context, topic string, body []byte) err
 	return nil
 }
 
-func (h *httpBroker) Subscribe(topic string, function func(context.Context, *Message)) (Subscriber, error) {
+func (h *httpBroker) Subscribe(topic string, handler Handler) (Subscriber, error) {
 	// parse address for host, port
 	parts := strings.Split(h.Address(), ":")
 	host := strings.Join(parts[:len(parts)-1], ":")
@@ -251,11 +222,10 @@ func (h *httpBroker) Subscribe(topic string, function func(context.Context, *Mes
 		id:    uuid.NewUUID().String(),
 		topic: topic,
 		ch:    h.unsubscribe,
-		fn:    function,
+		fn:    handler,
 		svc:   service,
 	}
 
-	log.Infof("Registering subscriber %s", node.Id)
 	if err := registry.Register(service); err != nil {
 		return nil, err
 	}

broker/nats/nats.go

@@ -3,14 +3,9 @@ package nats
 import (
 	"encoding/json"
 	"strings"
-	"time"
 
-	"code.google.com/p/go-uuid/uuid"
 	"github.com/apcera/nats"
 	"github.com/myodc/go-micro/broker"
-	c "github.com/myodc/go-micro/context"
-
-	"golang.org/x/net/context"
 )
 
 type nbroker struct {
@@ -22,12 +17,6 @@ type subscriber struct {
 	s *nats.Subscription
 }
 
-// used in brokers where there is no support for headers
-type envelope struct {
-	Header  map[string]string
-	Message *broker.Message
-}
-
 func (n *subscriber) Topic() string {
 	return n.s.Subject
 }
@@ -67,34 +56,21 @@ func (n *nbroker) Init() error {
 	return nil
 }
 
-func (n *nbroker) Publish(ctx context.Context, topic string, body []byte) error {
+func (n *nbroker) Publish(topic string, msg *broker.Message) error {
-	header, _ := c.GetMetadata(ctx)
+	b, err := json.Marshal(msg)
-
-	message := &broker.Message{
-		Id:        uuid.NewUUID().String(),
-		Timestamp: time.Now().Unix(),
-		Topic:     topic,
-		Body:      body,
-	}
-
-	b, err := json.Marshal(&envelope{
-		header,
-		message,
-	})
 	if err != nil {
 		return err
 	}
 	return n.conn.Publish(topic, b)
 }
 
-func (n *nbroker) Subscribe(topic string, function func(context.Context, *broker.Message)) (broker.Subscriber, error) {
+func (n *nbroker) Subscribe(topic string, handler broker.Handler) (broker.Subscriber, error) {
 	sub, err := n.conn.Subscribe(topic, func(msg *nats.Msg) {
-		var e *envelope
+		var m *broker.Message
-		if err := json.Unmarshal(msg.Data, &e); err != nil {
+		if err := json.Unmarshal(msg.Data, &m); err != nil {
 			return
 		}
-		ctx := c.WithMetadata(context.Background(), e.Header)
+		handler(m)
-		function(ctx, e.Message)
 	})
 	if err != nil {
 		return nil, err

broker/rabbitmq/rabbitmq.go

@@ -1,13 +1,8 @@
 package rabbitmq
 
 import (
-	"time"
-
-	"code.google.com/p/go-uuid/uuid"
 	"github.com/myodc/go-micro/broker"
-	c "github.com/myodc/go-micro/context"
 	"github.com/streadway/amqp"
-	"golang.org/x/net/context"
 )
 
 type rbroker struct {
@@ -28,24 +23,20 @@ func (s *subscriber) Unsubscribe() error {
 	return s.ch.Close()
 }
 
-func (r *rbroker) Publish(ctx context.Context, topic string, body []byte) error {
+func (r *rbroker) Publish(topic string, msg *broker.Message) error {
-	header, _ := c.GetMetadata(ctx)
+	m := amqp.Publishing{
-
+		Body:    msg.Body,
-	msg := amqp.Publishing{
+		Headers: amqp.Table{},
-		MessageId: uuid.NewUUID().String(),
-		Timestamp: time.Now().UTC(),
-		Body:      body,
-		Headers:   amqp.Table{},
 	}
 
-	for k, v := range header {
+	for k, v := range msg.Header {
-		msg.Headers[k] = v
+		m.Headers[k] = v
 	}
 
-	return r.conn.Publish("", topic, msg)
+	return r.conn.Publish("", topic, m)
 }
 
-func (r *rbroker) Subscribe(topic string, function func(context.Context, *broker.Message)) (broker.Subscriber, error) {
+func (r *rbroker) Subscribe(topic string, handler broker.Handler) (broker.Subscriber, error) {
 	ch, sub, err := r.conn.Consume(topic)
 	if err != nil {
 		return nil, err
@@ -56,12 +47,9 @@ func (r *rbroker) Subscribe(topic string, function func(context.Context, *broker
 		for k, v := range msg.Headers {
 			header[k], _ = v.(string)
 		}
-		ctx := c.WithMetadata(context.Background(), header)
+		handler(&broker.Message{
-		function(ctx, &broker.Message{
+			Header: header,
-			Id:        msg.MessageId,
+			Body:   msg.Body,
-			Timestamp: msg.Timestamp.Unix(),
-			Topic:     topic,
-			Body:      msg.Body,
 		})
 	}
 

client/client.go

@@ -1,19 +1,32 @@
 package client
 
 import (
-	"github.com/myodc/go-micro/registry"
-	"github.com/myodc/go-micro/transport"
 	"golang.org/x/net/context"
 )
 
 type Client interface {
-	NewRequest(string, string, interface{}) Request
+	NewPublication(topic string, msg interface{}) Publication
-	NewProtoRequest(string, string, interface{}) Request
+	NewRequest(service, method string, req interface{}) Request
-	NewJsonRequest(string, string, interface{}) Request
+	NewProtoRequest(service, method string, req interface{}) Request
-	Call(context.Context, Request, interface{}) error
+	NewJsonRequest(service, method string, req interface{}) Request
-	CallRemote(context.Context, string, Request, interface{}) error
+	Call(ctx context.Context, req Request, rsp interface{}) error
-	Stream(context.Context, Request, interface{}) (Streamer, error)
+	CallRemote(ctx context.Context, addr string, req Request, rsp interface{}) error
-	StreamRemote(context.Context, string, Request, interface{}) (Streamer, error)
+	Stream(ctx context.Context, req Request, rspChan interface{}) (Streamer, error)
+	StreamRemote(ctx context.Context, addr string, req Request, rspChan interface{}) (Streamer, error)
+	Publish(ctx context.Context, p Publication) error
+}
+
+type Publication interface {
+	Topic() string
+	Message() interface{}
+	ContentType() string
+}
+
+type Request interface {
+	Service() string
+	Method() string
+	ContentType() string
+	Request() interface{}
 }
 
 type Streamer interface {
@@ -22,29 +35,12 @@ type Streamer interface {
 	Close() error
 }
 
-type options struct {
-	registry  registry.Registry
-	transport transport.Transport
-}
-
 type Option func(*options)
 
 var (
 	DefaultClient Client = newRpcClient()
 )
 
-func Registry(r registry.Registry) Option {
-	return func(o *options) {
-		o.registry = r
-	}
-}
-
-func Transport(t transport.Transport) Option {
-	return func(o *options) {
-		o.transport = t
-	}
-}
-
 func Call(ctx context.Context, request Request, response interface{}) error {
 	return DefaultClient.Call(ctx, request, response)
 }
@@ -61,10 +57,18 @@ func StreamRemote(ctx context.Context, address string, request Request, response
 	return DefaultClient.StreamRemote(ctx, address, request, responseChan)
 }
 
+func Publish(ctx context.Context, p Publication) error {
+	return DefaultClient.Publish(ctx, p)
+}
+
 func NewClient(opt ...Option) Client {
 	return newRpcClient(opt...)
 }
 
+func NewPublication(topic string, message interface{}) Publication {
+	return DefaultClient.NewPublication(topic, message)
+}
+
 func NewRequest(service, method string, request interface{}) Request {
 	return DefaultClient.NewRequest(service, method, request)
 }

client/options.go

@@ -0,0 +1,31 @@
+package client
+
+import (
+	"github.com/myodc/go-micro/broker"
+	"github.com/myodc/go-micro/registry"
+	"github.com/myodc/go-micro/transport"
+)
+
+type options struct {
+	broker    broker.Broker
+	registry  registry.Registry
+	transport transport.Transport
+}
+
+func Broker(b broker.Broker) Option {
+	return func(o *options) {
+		o.broker = b
+	}
+}
+
+func Registry(r registry.Registry) Option {
+	return func(o *options) {
+		o.registry = r
+	}
+}
+
+func Transport(t transport.Transport) Option {
+	return func(o *options) {
+		o.transport = t
+	}
+}

client/request.go

@@ -1,8 +0,0 @@
-package client
-
-type Request interface {
-	Service() string
-	Method() string
-	ContentType() string
-	Request() interface{}
-}

client/rpc_client.go

@@ -1,11 +1,14 @@
 package client
 
 import (
+	"encoding/json"
 	"fmt"
 	"math/rand"
 	"net/http"
+	"sync"
 	"time"
 
+	"github.com/myodc/go-micro/broker"
 	c "github.com/myodc/go-micro/context"
 	"github.com/myodc/go-micro/errors"
 	"github.com/myodc/go-micro/registry"
@@ -13,6 +16,7 @@ import (
 
 	rpc "github.com/youtube/vitess/go/rpcplus"
 
+	"github.com/golang/protobuf/proto"
 	"golang.org/x/net/context"
 )
 
@@ -21,6 +25,7 @@ type headerRoundTripper struct {
 }
 
 type rpcClient struct {
+	once sync.Once
 	opts options
 }
 
@@ -39,7 +44,14 @@ func newRpcClient(opt ...Option) Client {
 		opts.transport = transport.DefaultTransport
 	}
 
+	if opts.broker == nil {
+		opts.broker = broker.DefaultBroker
+	}
+
+	var once sync.Once
+
 	return &rpcClient{
+		once: once,
 		opts: opts,
 	}
 }
@@ -152,6 +164,48 @@ func (r *rpcClient) Stream(ctx context.Context, request Request, responseChan in
 	return r.stream(ctx, address, request, responseChan)
 }
 
+func (r *rpcClient) Publish(ctx context.Context, p Publication) error {
+	md, ok := c.GetMetadata(ctx)
+	if !ok {
+		md = make(map[string]string)
+	}
+	md["Content-Type"] = p.ContentType()
+
+	// encode message body
+	var body []byte
+
+	switch p.ContentType() {
+	case "application/octet-stream":
+		b, err := proto.Marshal(p.Message().(proto.Message))
+		if err != nil {
+			return err
+		}
+		body = b
+	case "application/json":
+		b, err := json.Marshal(p.Message())
+		if err != nil {
+			return err
+		}
+		body = b
+	}
+
+	r.once.Do(func() {
+		r.opts.broker.Connect()
+	})
+
+	return r.opts.broker.Publish(p.Topic(), &broker.Message{
+		Header: md,
+		Body:   body,
+	})
+}
+
+func (r *rpcClient) NewPublication(topic string, message interface{}) Publication {
+	return r.NewProtoPublication(topic, message)
+}
+
+func (r *rpcClient) NewProtoPublication(topic string, message interface{}) Publication {
+	return newRpcPublication(topic, message, "application/octet-stream")
+}
 func (r *rpcClient) NewRequest(service, method string, request interface{}) Request {
 	return r.NewProtoRequest(service, method, request)
 }

client/rpc_publication.go

@@ -0,0 +1,27 @@
+package client
+
+type rpcPublication struct {
+	topic       string
+	contentType string
+	message     interface{}
+}
+
+func newRpcPublication(topic string, message interface{}, contentType string) Publication {
+	return &rpcPublication{
+		message:     message,
+		topic:       topic,
+		contentType: contentType,
+	}
+}
+
+func (r *rpcPublication) ContentType() string {
+	return r.contentType
+}
+
+func (r *rpcPublication) Topic() string {
+	return r.topic
+}
+
+func (r *rpcPublication) Message() interface{} {
+	return r.message
+}

examples/client/main.go

@@ -10,6 +10,26 @@ import (
 	"golang.org/x/net/context"
 )
 
+func pub() {
+	msg := client.NewPublication("topic.go.micro.srv.example", &example.Message{
+		Say: "This is a publication",
+	})
+
+	// create context with metadata
+	ctx := c.WithMetadata(context.Background(), map[string]string{
+		"X-User-Id": "john",
+		"X-From-Id": "script",
+	})
+
+	// publish message
+	if err := client.Publish(ctx, msg); err != nil {
+		fmt.Println("pub err: ", err)
+		return
+	}
+
+	fmt.Printf("Published: %v\n", msg)
+}
+
 func call(i int) {
 	// Create new request to service go.micro.srv.example, method Example.Call
 	req := client.NewRequest("go.micro.srv.example", "Example.Call", &example.Request{
@@ -26,7 +46,7 @@ func call(i int) {
 
 	// Call service
 	if err := client.Call(ctx, req, rsp); err != nil {
-		fmt.Println("err: ", err, rsp)
+		fmt.Println("call err: ", err, rsp)
 		return
 	}
 
@@ -52,7 +72,7 @@ func stream() {
 	}
 
 	if stream.Error() != nil {
-		fmt.Println("err:", err)
+		fmt.Println("stream err:", err)
 		return
 	}
 
@@ -67,4 +87,5 @@ func main() {
 	}
 
 	stream()
+	pub()
 }

examples/pubsub/main.go

@@ -7,9 +7,6 @@ import (
 	log "github.com/golang/glog"
 	"github.com/myodc/go-micro/broker"
 	"github.com/myodc/go-micro/cmd"
-	c "github.com/myodc/go-micro/context"
-
-	"golang.org/x/net/context"
 )
 
 var (
@@ -20,24 +17,24 @@ func pub() {
 	tick := time.NewTicker(time.Second)
 	i := 0
 	for _ = range tick.C {
-		ctx := c.WithMetadata(context.Background(), map[string]string{
+		msg := &broker.Message{
-			"id": fmt.Sprintf("%d", i),
+			Header: map[string]string{
-		})
+				"id": fmt.Sprintf("%d", i),
-
+			},
-		msg := fmt.Sprintf("%d: %s", i, time.Now().String())
+			Body: []byte(fmt.Sprintf("%d: %s", i, time.Now().String())),
-		if err := broker.Publish(ctx, topic, []byte(msg)); err != nil {
+		}
+		if err := broker.Publish(topic, msg); err != nil {
 			log.Errorf("[pub] failed: %v", err)
 		} else {
-			fmt.Println("[pub] pubbed message:", msg)
+			fmt.Println("[pub] pubbed message:", string(msg.Body))
 		}
 		i++
 	}
 }
 
 func sub() {
-	_, err := broker.Subscribe(topic, func(ctx context.Context, msg *broker.Message) {
+	_, err := broker.Subscribe(topic, func(msg *broker.Message) {
-		md, _ := c.GetMetadata(ctx)
+		fmt.Println("[sub] received message:", string(msg.Body), "header", msg.Header)
-		fmt.Println("[sub] received message:", string(msg.Body), "context", md)
 	})
 	if err != nil {
 		fmt.Println(err)

examples/server/main.go

@@ -4,6 +4,7 @@ import (
 	log "github.com/golang/glog"
 	"github.com/myodc/go-micro/cmd"
 	"github.com/myodc/go-micro/examples/server/handler"
+	"github.com/myodc/go-micro/examples/server/subscriber"
 	"github.com/myodc/go-micro/server"
 )
 
@@ -23,6 +24,21 @@ func main() {
 		),
 	)
 
+	// Register Subscribers
+	server.Subscribe(
+		server.NewSubscriber(
+			"topic.go.micro.srv.example",
+			new(subscriber.Example),
+		),
+	)
+
+	server.Subscribe(
+		server.NewSubscriber(
+			"topic.go.micro.srv.example",
+			subscriber.Handler,
+		),
+	)
+
 	// Run server
 	if err := server.Run(); err != nil {
 		log.Fatal(err)

examples/server/proto/example/example.pb.go

@@ -9,6 +9,7 @@ It is generated from these files:
 	go-micro/examples/server/proto/example/example.proto
 
 It has these top-level messages:
+	Message
 	Request
 	Response
 	StreamingRequest
@@ -21,6 +22,14 @@ import proto "github.com/golang/protobuf/proto"
 // Reference imports to suppress errors if they are not otherwise used.
 var _ = proto.Marshal
 
+type Message struct {
+	Say string `protobuf:"bytes,1,opt,name=say" json:"say,omitempty"`
+}
+
+func (m *Message) Reset()         { *m = Message{} }
+func (m *Message) String() string { return proto.CompactTextString(m) }
+func (*Message) ProtoMessage()    {}
+
 type Request struct {
 	Name string `protobuf:"bytes,1,opt,name=name" json:"name,omitempty"`
 }

examples/server/proto/example/example.proto

@@ -1,5 +1,9 @@
 syntax = "proto3";
 
+message Message {
+	string say = 1;
+}
+
 message Request {
 	string name = 1;
 }

examples/server/subscriber/subscriber.go

@@ -0,0 +1,18 @@
+package subscriber
+
+import (
+	log "github.com/golang/glog"
+	example "github.com/myodc/go-micro/examples/server/proto/example"
+	"golang.org/x/net/context"
+)
+
+type Example struct{}
+
+func (e *Example) Handle(ctx context.Context, msg *example.Message) error {
+	log.Info("Handler Received message: ", msg.Say)
+	return nil
+}
+
+func Handler(msg *example.Message) {
+	log.Info("Function Received message: ", msg.Say)
+}

registry/service.go

@@ -19,6 +19,7 @@ type Endpoint struct {
 	Name     string
 	Request  *Value
 	Response *Value
+	Metadata map[string]string
 }
 
 type Value struct {

server/extractor.go

@@ -1,6 +1,7 @@
 package server
 
 import (
+	"fmt"
 	"reflect"
 
 	"github.com/myodc/go-micro/registry"
@@ -37,7 +38,7 @@ func extractEndpoint(method reflect.Method) *registry.Endpoint {
 	}
 
 	var rspType, reqType reflect.Type
-	//	var stream bool
+	var stream bool
 	mt := method.Type
 
 	switch mt.NumIn() {
@@ -51,9 +52,9 @@ func extractEndpoint(method reflect.Method) *registry.Endpoint {
 		return nil
 	}
 
-	//	if rspType.Kind() == reflect.Func {
+	if rspType.Kind() == reflect.Func {
-	//		stream = true
+		stream = true
-	//	}
+	}
 
 	request := extractValue(reqType)
 	response := extractValue(rspType)
@@ -62,5 +63,21 @@ func extractEndpoint(method reflect.Method) *registry.Endpoint {
 		Name:     method.Name,
 		Request:  request,
 		Response: response,
+		Metadata: map[string]string{
+			"stream": fmt.Sprintf("%v", stream),
+		},
 	}
 }
+
+func extractSubValue(typ reflect.Type) *registry.Value {
+	var reqType reflect.Type
+	switch typ.NumIn() {
+	case 1:
+		reqType = typ.In(0)
+	case 2:
+		reqType = typ.In(1)
+	default:
+		return nil
+	}
+	return extractValue(reqType)
+}

server/handler.go

@@ -9,3 +9,9 @@ type Handler interface {
 	Handler() interface{}
 	Endpoints() []*registry.Endpoint
 }
+
+type Subscriber interface {
+	Topic() string
+	Subscriber() interface{}
+	Endpoints() []*registry.Endpoint
+}

server/options.go

@@ -1,11 +1,13 @@
 package server
 
 import (
+	"github.com/myodc/go-micro/broker"
 	"github.com/myodc/go-micro/registry"
 	"github.com/myodc/go-micro/transport"
 )
 
 type options struct {
+	broker    broker.Broker
 	registry  registry.Registry
 	transport transport.Transport
 	metadata  map[string]string
@@ -22,6 +24,10 @@ func newOptions(opt ...Option) options {
 		o(&opts)
 	}
 
+	if opts.broker == nil {
+		opts.broker = broker.DefaultBroker
+	}
+
 	if opts.registry == nil {
 		opts.registry = registry.DefaultRegistry
 	}
@@ -93,6 +99,12 @@ func Address(a string) Option {
 	}
 }
 
+func Broker(b broker.Broker) Option {
+	return func(o *options) {
+		o.broker = b
+	}
+}
+
 func Registry(r registry.Registry) Option {
 	return func(o *options) {
 		o.registry = r

server/rpc_server.go

@@ -1,10 +1,12 @@
 package server
 
 import (
+	"fmt"
 	"strconv"
 	"strings"
 	"sync"
 
+	"github.com/myodc/go-micro/broker"
 	c "github.com/myodc/go-micro/context"
 	"github.com/myodc/go-micro/registry"
 	"github.com/myodc/go-micro/transport"
@@ -20,16 +22,18 @@ type rpcServer struct {
 	exit chan chan error
 
 	sync.RWMutex
-	opts     options
+	opts        options
-	handlers map[string]Handler
+	handlers    map[string]Handler
+	subscribers map[*subscriber][]broker.Subscriber
 }
 
 func newRpcServer(opts ...Option) Server {
 	return &rpcServer{
-		opts:     newOptions(opts...),
+		opts:        newOptions(opts...),
-		rpc:      rpc.NewServer(),
+		rpc:         rpc.NewServer(),
-		handlers: make(map[string]Handler),
+		handlers:    make(map[string]Handler),
-		exit:     make(chan chan error),
+		subscribers: make(map[*subscriber][]broker.Subscriber),
+		exit:        make(chan chan error),
 	}
 }
 
@@ -84,6 +88,29 @@ func (s *rpcServer) Handle(h Handler) error {
 	return nil
 }
 
+func (s *rpcServer) NewSubscriber(topic string, sb interface{}) Subscriber {
+	return newSubscriber(topic, sb)
+}
+
+func (s *rpcServer) Subscribe(sb Subscriber) error {
+	sub, ok := sb.(*subscriber)
+	if !ok {
+		return fmt.Errorf("invalid subscriber: expected *subscriber")
+	}
+	if len(sub.handlers) == 0 {
+		return fmt.Errorf("invalid subscriber: no handler functions")
+	}
+
+	s.Lock()
+	_, ok = s.subscribers[sub]
+	if ok {
+		return fmt.Errorf("subscriber %v already exists", s)
+	}
+	s.subscribers[sub] = nil
+	s.Unlock()
+	return nil
+}
+
 func (s *rpcServer) Register() error {
 	// parse address for host, port
 	config := s.Config()
@@ -110,6 +137,9 @@ func (s *rpcServer) Register() error {
 	for _, e := range s.handlers {
 		endpoints = append(endpoints, e.Endpoints()...)
 	}
+	for e, _ := range s.subscribers {
+		endpoints = append(endpoints, e.Endpoints()...)
+	}
 	s.RUnlock()
 
 	service := &registry.Service{
@@ -120,7 +150,23 @@ func (s *rpcServer) Register() error {
 	}
 
 	log.Infof("Registering node: %s", node.Id)
-	return config.registry.Register(service)
+	if err := config.registry.Register(service); err != nil {
+		return err
+	}
+
+	s.Lock()
+	defer s.Unlock()
+
+	for sb, _ := range s.subscribers {
+		handler := createSubHandler(sb)
+		sub, err := config.broker.Subscribe(sb.Topic(), handler)
+		if err != nil {
+			return err
+		}
+		s.subscribers[sb] = []broker.Subscriber{sub}
+	}
+
+	return nil
 }
 
 func (s *rpcServer) Deregister() error {
@@ -147,7 +193,21 @@ func (s *rpcServer) Deregister() error {
 		Nodes:   []*registry.Node{node},
 	}
 
-	return config.registry.Deregister(service)
+	log.Infof("Deregistering node: %s", node.Id)
+	if err := config.registry.Deregister(service); err != nil {
+		return err
+	}
+
+	s.Lock()
+	for sb, subs := range s.subscribers {
+		for _, sub := range subs {
+			log.Infof("Unsubscribing from topic: %s", sub.Topic())
+			sub.Unsubscribe()
+		}
+		s.subscribers[sb] = nil
+	}
+	s.Unlock()
+	return nil
 }
 
 func (s *rpcServer) Start() error {
@@ -169,9 +229,11 @@ func (s *rpcServer) Start() error {
 	go func() {
 		ch := <-s.exit
 		ch <- ts.Close()
+		config.broker.Disconnect()
 	}()
 
-	return nil
+	// TODO: subscribe to cruft
+	return config.broker.Connect()
 }
 
 func (s *rpcServer) Stop() error {

server/server.go

@@ -14,6 +14,8 @@ type Server interface {
 	Init(...Option)
 	Handle(Handler) error
 	NewHandler(interface{}) Handler
+	NewSubscriber(string, interface{}) Subscriber
+	Subscribe(Subscriber) error
 	Register() error
 	Deregister() error
 	Start() error
@@ -45,6 +47,10 @@ func NewServer(opt ...Option) Server {
 	return newRpcServer(opt...)
 }
 
+func NewSubscriber(topic string, h interface{}) Subscriber {
+	return DefaultServer.NewSubscriber(topic, h)
+}
+
 func NewHandler(h interface{}) Handler {
 	return DefaultServer.NewHandler(h)
 }
@@ -53,6 +59,10 @@ func Handle(h Handler) error {
 	return DefaultServer.Handle(h)
 }
 
+func Subscribe(s Subscriber) error {
+	return DefaultServer.Subscribe(s)
+}
+
 func Register() error {
 	return DefaultServer.Register()
 }
@@ -78,9 +88,6 @@ func Run() error {
 		return err
 	}
 
-	log.Infof("Deregistering %s", DefaultServer.Config().Id())
-	DefaultServer.Deregister()
-
 	return Stop()
 }
 

server/subscriber.go

@@ -0,0 +1,154 @@
+package server
+
+import (
+	"encoding/json"
+	"reflect"
+
+	"github.com/golang/protobuf/proto"
+	"github.com/myodc/go-micro/broker"
+	c "github.com/myodc/go-micro/context"
+	"github.com/myodc/go-micro/registry"
+	"golang.org/x/net/context"
+)
+
+type handler struct {
+	method  reflect.Value
+	reqType reflect.Type
+	ctxType reflect.Type
+}
+
+type subscriber struct {
+	topic      string
+	rcvr       reflect.Value
+	typ        reflect.Type
+	subscriber interface{}
+	handlers   []*handler
+	endpoints  []*registry.Endpoint
+}
+
+func newSubscriber(topic string, sub interface{}) Subscriber {
+	var endpoints []*registry.Endpoint
+	var handlers []*handler
+
+	if typ := reflect.TypeOf(sub); typ.Kind() == reflect.Func {
+		h := &handler{
+			method: reflect.ValueOf(sub),
+		}
+
+		switch typ.NumIn() {
+		case 1:
+			h.reqType = typ.In(0)
+		case 2:
+			h.ctxType = typ.In(0)
+			h.reqType = typ.In(1)
+		}
+
+		handlers = append(handlers, h)
+
+		endpoints = append(endpoints, &registry.Endpoint{
+			Name:    "Func",
+			Request: extractSubValue(typ),
+			Metadata: map[string]string{
+				"topic": topic,
+			},
+		})
+	} else {
+		for m := 0; m < typ.NumMethod(); m++ {
+			method := typ.Method(m)
+			h := &handler{
+				method: method.Func,
+			}
+
+			switch method.Type.NumIn() {
+			case 2:
+				h.reqType = method.Type.In(1)
+			case 3:
+				h.ctxType = method.Type.In(1)
+				h.reqType = method.Type.In(2)
+			}
+
+			handlers = append(handlers, h)
+
+			endpoints = append(endpoints, &registry.Endpoint{
+				Name:    method.Name,
+				Request: extractSubValue(method.Type),
+				Metadata: map[string]string{
+					"topic": topic,
+				},
+			})
+		}
+	}
+
+	return &subscriber{
+		rcvr:       reflect.ValueOf(sub),
+		typ:        reflect.TypeOf(sub),
+		topic:      topic,
+		subscriber: sub,
+		handlers:   handlers,
+		endpoints:  endpoints,
+	}
+}
+
+func createSubHandler(sb *subscriber) broker.Handler {
+	return func(msg *broker.Message) {
+		hdr := make(map[string]string)
+		for k, v := range msg.Header {
+			hdr[k] = v
+		}
+		delete(hdr, "Content-Type")
+		ctx := c.WithMetadata(context.Background(), hdr)
+		rctx := reflect.ValueOf(ctx)
+
+		for _, handler := range sb.handlers {
+			var isVal bool
+			var req reflect.Value
+			var uerr error
+
+			if handler.reqType.Kind() == reflect.Ptr {
+				req = reflect.New(handler.reqType.Elem())
+			} else {
+				req = reflect.New(handler.reqType)
+				isVal = true
+			}
+
+			switch msg.Header["Content-Type"] {
+			case "application/octet-stream":
+				uerr = proto.Unmarshal(msg.Body, req.Interface().(proto.Message))
+			case "application/json":
+				uerr = json.Unmarshal(msg.Body, req.Interface())
+			}
+
+			if uerr != nil {
+				continue
+			}
+
+			if isVal {
+				req = req.Elem()
+			}
+
+			var vals []reflect.Value
+			if sb.typ.Kind() != reflect.Func {
+				vals = append(vals, sb.rcvr)
+			}
+
+			if handler.ctxType != nil {
+				vals = append(vals, rctx)
+			}
+
+			vals = append(vals, req)
+			go handler.method.Call(vals)
+		}
+	}
+}
+
+func (s *subscriber) Topic() string {
+	return s.topic
+}
+
+func (s *subscriber) Subscriber() interface{} {
+	return s.subscriber
+}
+
+func (s *subscriber) Endpoints() []*registry.Endpoint {
+	return s.endpoints
+}

transport/http_transport.go

@@ -137,7 +137,6 @@ func (h *httpTransportSocket) Send(m *Message) error {
 		ProtoMajor:    1,
 		ProtoMinor:    1,
 		ContentLength: int64(len(m.Body)),
-		//		Request:       h.r,
 	}
 
 	for k, v := range m.Header {

transport/transport.go

@@ -1,7 +1,6 @@
 package transport
 
 type Message struct {
-	Id     string
 	Header map[string]string
 	Body   []byte
 }