fix: allow subscribers to register and deregister multi times.

http.go

@@ -9,12 +9,12 @@ import (
 	"sort"
 	"sync"
 
-	"github.com/micro/go-log"
+	log "github.com/micro/go-log"
 	"github.com/micro/go-micro/broker"
-	"github.com/micro/go-micro/server"
 	"github.com/micro/go-micro/cmd"
 	"github.com/micro/go-micro/codec"
 	"github.com/micro/go-micro/registry"
+	"github.com/micro/go-micro/server"
 	"github.com/micro/go-plugins/codec/jsonrpc"
 	"github.com/micro/go-plugins/codec/protorpc"
 )
@@ -28,6 +28,7 @@ var (
 		"application/octet-stream": protorpc.NewCodec,
 	}
 )
+
 type httpServer struct {
 	sync.Mutex
 	opts         server.Options
@@ -35,6 +36,8 @@ type httpServer struct {
 	exit         chan chan error
 	registerOnce sync.Once
 	subscribers  map[*httpSubscriber][]broker.Subscriber
+	// used for first registration
+	registered bool
 }
 
 func init() {
@@ -162,6 +165,19 @@ func (h *httpServer) Register() error {
 
 	h.registerOnce.Do(func() {
 		log.Logf("Registering node: %s", opts.Name+"-"+opts.Id)
+	})
+
+	if err := opts.Registry.Register(service, rOpts...); err != nil {
+		return err
+	}
+
+	h.Lock()
+	defer h.Unlock()
+
+	if h.registered {
+		return nil
+	}
+	h.registered = true
 
 	for sb, _ := range h.subscribers {
 		handler := h.createSubHandler(sb, opts)
@@ -171,14 +187,11 @@ func (h *httpServer) Register() error {
 		}
 		sub, err := opts.Broker.Subscribe(sb.Topic(), handler, subOpts...)
 		if err != nil {
-				log.Logf("Registering subscriber: %s, err: %s", sb.Topic, err)
-				return
+			return err
 		}
 		h.subscribers[sb] = []broker.Subscriber{sub}
 	}
-	})
-
-	return opts.Registry.Register(service, rOpts...)
+	return nil
 }
 
 func (h *httpServer) Deregister() error {
@@ -194,6 +207,12 @@ func (h *httpServer) Deregister() error {
 	}
 
 	h.Lock()
+	if !h.registered {
+		h.Unlock()
+		return nil
+	}
+	h.registered = false
+
 	for sb, subs := range h.subscribers {
 		for _, sub := range subs {
 			log.Logf("Unsubscribing from topic: %s", sub.Topic())