optimise http broker with rcache

broker/broker.go

@@ -2,8 +2,6 @@
 package broker
 
 // Broker is an interface used for asynchronous messaging.
-// Its an abstraction over various message brokers
-// {NATS, RabbitMQ, Kafka, ...}
 type Broker interface {
 	Options() Options
 	Address() string

broker/http_broker.go

@@ -3,6 +3,7 @@ package broker
 import (
 	"bytes"
 	"crypto/tls"
+	"errors"
 	"fmt"
 	"io"
 	"io/ioutil"
@@ -18,8 +19,9 @@ import (
 
 	"github.com/micro/go-log"
 	"github.com/micro/go-micro/broker/codec/json"
-	"github.com/micro/go-micro/errors"
+	merr "github.com/micro/go-micro/errors"
 	"github.com/micro/go-micro/registry"
+	"github.com/micro/go-rcache"
 	maddr "github.com/micro/misc/lib/addr"
 	mnet "github.com/micro/misc/lib/net"
 	mls "github.com/micro/misc/lib/tls"
@@ -28,20 +30,17 @@ import (
 	"golang.org/x/net/context"
 )
 
-// HTTP Broker is a placeholder for actual message brokers.
+// HTTP Broker is a point to point async broker
-// This should not really be used in production but useful
-// in developer where you want zero dependencies.
-
 type httpBroker struct {
-	id          string
+	id      string
-	address     string
+	address string
-	unsubscribe chan *httpSubscriber
+	opts    Options
-	opts        Options
 
 	mux *http.ServeMux
 
-	c *http.Client
+	c  *http.Client
-	r registry.Registry
+	r  registry.Registry
+	rc rcache.Cache
 
 	sync.RWMutex
 	subscribers map[string][]*httpSubscriber
@@ -53,9 +52,9 @@ type httpSubscriber struct {
 	opts  SubscribeOptions
 	id    string
 	topic string
-	ch    chan *httpSubscriber
 	fn    Handler
 	svc   *registry.Service
+	hb    *httpBroker
 }
 
 type httpPublication struct {
@@ -106,11 +105,13 @@ func newHttpBroker(opts ...Option) Broker {
 		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
@@ -123,7 +124,6 @@ func newHttpBroker(opts ...Option) Broker {
 		r:           reg,
 		c:           &http.Client{Transport: newTransport(options.TLSConfig)},
 		subscribers: make(map[string][]*httpSubscriber),
-		unsubscribe: make(chan *httpSubscriber),
 		exit:        make(chan chan error),
 		mux:         http.NewServeMux(),
 	}
@@ -153,9 +153,41 @@ func (h *httpSubscriber) Topic() string {
 }
 
 func (h *httpSubscriber) Unsubscribe() error {
-	h.ch <- h
+	return h.hb.unsubscribe(h)
-	// artificial delay
+}
-	time.Sleep(time.Millisecond * 10)
+
+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()
+
+	var subscribers []*httpSubscriber
+
+	// look for subscriber
+	for _, sub := range h.subscribers[s.topic] {
+		// deregister and skip forward
+		if sub.id == s.id {
+			h.r.Deregister(sub.svc)
+			continue
+		}
+		// keep subscriber
+		subscribers = append(subscribers, sub)
+	}
+
+	// set subscribers
+	h.subscribers[s.topic] = subscribers
+
 	return nil
 }
 
@@ -177,29 +209,75 @@ func (h *httpBroker) run(l net.Listener) {
 		// received exit signal
 		case ch := <-h.exit:
 			ch <- l.Close()
-			h.Lock()
+			h.RLock()
-			h.running = false
+			for _, subs := range h.subscribers {
-			h.Unlock()
+				for _, sub := range subs {
-			return
-		// unsubscribe subscriber
-		case subscriber := <-h.unsubscribe:
-			h.Lock()
-			var subscribers []*httpSubscriber
-			for _, sub := range h.subscribers[subscriber.topic] {
-				// deregister and skip forward
-				if sub.id == subscriber.id {
 					h.r.Deregister(sub.svc)
-					continue
 				}
-				subscribers = append(subscribers, sub)
 			}
-			h.subscribers[subscriber.topic] = subscribers
+			h.RUnlock()
-			h.Unlock()
+			return
 		}
 	}
 }
 
-func (h *httpBroker) start() error {
+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 := &httpPublication{m: m, t: topic}
+	id := req.Form.Get("id")
+
+	h.RLock()
+	for _, subscriber := range h.subscribers[topic] {
+		if id == subscriber.id {
+			// sub is sync; crufty rate limiting
+			// so we don't hose the cpu
+			subscriber.fn(p)
+		}
+	}
+	h.RUnlock()
+}
+
+func (h *httpBroker) Address() string {
+	h.RLock()
+	defer h.RUnlock()
+	return h.address
+}
+
+func (h *httpBroker) Connect() error {
 	h.Lock()
 	defer h.Unlock()
 
@@ -255,11 +333,20 @@ func (h *httpBroker) start() error {
 	go http.Serve(l, h.mux)
 	go h.run(l)
 
+	// get registry
+	reg, ok := h.opts.Context.Value(registryKey).(registry.Registry)
+	if !ok {
+		reg = registry.DefaultRegistry
+	}
+	// set rcache
+	h.r = rcache.New(reg)
+
+	// set running
 	h.running = true
 	return nil
 }
 
-func (h *httpBroker) stop() error {
+func (h *httpBroker) Disconnect() error {
 	h.Lock()
 	defer h.Unlock()
 
@@ -267,76 +354,30 @@ func (h *httpBroker) stop() error {
 		return nil
 	}
 
+	// stop rcache
+	rc, ok := h.r.(rcache.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) ServeHTTP(w http.ResponseWriter, req *http.Request) {
-	if req.Method != "POST" {
-		err := errors.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 := errors.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 := errors.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 := errors.InternalServerError("go.micro.broker", "Topic not found")
-		w.WriteHeader(500)
-		w.Write([]byte(errr.Error()))
-		return
-	}
-
-	p := &httpPublication{m: m, t: topic}
-	id := req.Form.Get("id")
-
-	h.RLock()
-	for _, subscriber := range h.subscribers[topic] {
-		if id == subscriber.id {
-			// sub is sync; crufty rate limiting
-			// so we don't hose the cpu
-			subscriber.fn(p)
-		}
-	}
-	h.RUnlock()
-}
-
-func (h *httpBroker) Address() string {
-	return h.address
-}
-
-func (h *httpBroker) Connect() error {
-	return h.start()
-}
-
-func (h *httpBroker) Disconnect() error {
-	return h.stop()
-}
-
 func (h *httpBroker) Init(opts ...Option) error {
+	h.Lock()
+	defer h.Unlock()
+
+	if h.running {
+		return errors.New("cannot init while connected")
+	}
+
 	for _, o := range opts {
 		o(&h.opts)
 	}
@@ -345,12 +386,19 @@ func (h *httpBroker) Init(opts ...Option) error {
 		h.id = "broker-" + uuid.NewUUID().String()
 	}
 
+	// get registry
 	reg, ok := h.opts.Context.Value(registryKey).(registry.Registry)
 	if !ok {
 		reg = registry.DefaultRegistry
 	}
 
-	h.r = reg
+	// get rcache
+	if rc, ok := h.r.(rcache.Cache); ok {
+		rc.Stop()
+	}
+
+	// set registry
+	h.r = rcache.New(reg)
 
 	return nil
 }
@@ -360,10 +408,13 @@ func (h *httpBroker) Options() Options {
 }
 
 func (h *httpBroker) Publish(topic string, msg *Message, opts ...PublishOption) error {
+	h.RLock()
 	s, err := h.r.GetService("topic:" + topic)
 	if err != nil {
+		h.RUnlock()
 		return err
 	}
+	h.RUnlock()
 
 	m := &Message{
 		Header: make(map[string]string),
@@ -381,7 +432,7 @@ func (h *httpBroker) Publish(topic string, msg *Message, opts ...PublishOption)
 		return err
 	}
 
-	fn := func(node *registry.Node, b []byte) {
+	pub := func(node *registry.Node, b []byte) {
 		scheme := "http"
 
 		// check if secure is added in metadata
@@ -411,15 +462,14 @@ func (h *httpBroker) Publish(topic string, msg *Message, opts ...PublishOption)
 		case broadcastVersion:
 			for _, node := range service.Nodes {
 				// publish async
-				go fn(node, b)
+				go pub(node, b)
 			}
-
 		default:
 			// select node to publish to
 			node := service.Nodes[rand.Int()%len(service.Nodes)]
 
 			// publish async
-			go fn(node, b)
+			go pub(node, b)
 		}
 	}
 
@@ -427,7 +477,7 @@ func (h *httpBroker) Publish(topic string, msg *Message, opts ...PublishOption)
 }
 
 func (h *httpBroker) Subscribe(topic string, handler Handler, opts ...SubscribeOption) (Subscriber, error) {
-	opt := newSubscribeOptions(opts...)
+	options := newSubscribeOptions(opts...)
 
 	// parse address for host, port
 	parts := strings.Split(h.Address(), ":")
@@ -439,7 +489,8 @@ func (h *httpBroker) Subscribe(topic string, handler Handler, opts ...SubscribeO
 		return nil, err
 	}
 
-	id := uuid.NewUUID().String()
+	// create unique id
+	id := h.id + "." + uuid.NewUUID().String()
 
 	var secure bool
 
@@ -449,7 +500,7 @@ func (h *httpBroker) Subscribe(topic string, handler Handler, opts ...SubscribeO
 
 	// register service
 	node := &registry.Node{
-		Id:      h.id + "." + id,
+		Id:      id,
 		Address: addr,
 		Port:    port,
 		Metadata: map[string]string{
@@ -457,7 +508,8 @@ func (h *httpBroker) Subscribe(topic string, handler Handler, opts ...SubscribeO
 		},
 	}
 
-	version := opt.Queue
+	// check for queue group or broadcast queue
+	version := options.Queue
 	if len(version) == 0 {
 		version = broadcastVersion
 	}
@@ -468,22 +520,22 @@ func (h *httpBroker) Subscribe(topic string, handler Handler, opts ...SubscribeO
 		Nodes:   []*registry.Node{node},
 	}
 
+	// generate subscriber
 	subscriber := &httpSubscriber{
-		opts:  opt,
+		opts:  options,
-		id:    h.id + "." + id,
+		hb:    h,
+		id:    id,
 		topic: topic,
-		ch:    h.unsubscribe,
 		fn:    handler,
 		svc:   service,
 	}
 
-	if err := h.r.Register(service, registry.RegisterTTL(registerTTL)); err != nil {
+	// subscribe now
+	if err := h.subscribe(subscriber); err != nil {
 		return nil, err
 	}
 
-	h.Lock()
+	// return the subscriber
-	h.subscribers[topic] = append(h.subscribers[topic], subscriber)
-	h.Unlock()
 	return subscriber, nil
 }