Track remote consul servers

consul/catalog_endpoint.go

@@ -12,7 +12,6 @@ type Catalog struct {
 /*
 * Register : Registers that a node provides a given service
 * Deregister : Deregisters that a node provides a given service
-* RemoveNode: Used to force remove a node
 
 * ListDatacenters: List the known datacenters
 * ListServices : Lists the available services

consul/serf.go

@@ -42,11 +42,10 @@ func (s *Server) wanEventHandler() {
 			case serf.EventMemberJoin:
 				s.remoteJoin(e.(serf.MemberEvent))
 			case serf.EventMemberLeave:
-				s.remoteLeave(e.(serf.MemberEvent))
+				fallthrough
 			case serf.EventMemberFailed:
 				s.remoteFailed(e.(serf.MemberEvent))
 			case serf.EventUser:
-				s.remoteEvent(e.(serf.UserEvent))
 			default:
 				s.logger.Printf("[WARN] Unhandled LAN Serf Event: %#v", e)
 			}
@@ -62,15 +61,16 @@ func (s *Server) localJoin(me serf.MemberEvent) {
 	// Check for consul members
 	for _, m := range me.Members {
 		ok, dc, port := s.isConsulServer(m)
-		if ok {
+		if !ok {
+			continue
+		}
 		if dc != s.config.Datacenter {
 			s.logger.Printf("[WARN] Consul server %s for datacenter %s has joined wrong cluster",
 				m.Name, dc)
-				return
+			continue
 		}
 		go s.joinConsulServer(m, port)
 	}
-	}
 }
 
 // localLeave is used to handle leave events on the lan serf cluster
@@ -87,18 +87,65 @@ func (s *Server) localEvent(ue serf.UserEvent) {
 
 // remoteJoin is used to handle join events on the wan serf cluster
 func (s *Server) remoteJoin(me serf.MemberEvent) {
-}
+	for _, m := range me.Members {
+		ok, dc, port := s.isConsulServer(m)
+		if !ok {
+			s.logger.Printf("[WARN] Non-Consul server in WAN pool: %s %s", m.Name)
+			continue
+		}
+		var addr net.Addr = &net.TCPAddr{IP: m.Addr, Port: port}
+		s.logger.Printf("[INFO] Adding Consul server (Datacenter: %s) (Addr: %s)", dc, addr)
 
-// remoteLeave is used to handle leave events on the wan serf cluster
+		// Check if this server is known
-func (s *Server) remoteLeave(me serf.MemberEvent) {
+		found := false
+		s.remoteLock.Lock()
+		existing := s.remoteConsuls[dc]
+		for _, e := range existing {
+			if e.String() == addr.String() {
+				found = true
+				break
+			}
+		}
+
+		// Add ot the list if not known
+		if !found {
+			s.remoteConsuls[dc] = append(existing, addr)
+		}
+		s.remoteLock.Unlock()
+	}
 }
 
 // remoteFailed is used to handle fail events on the wan serf cluster
 func (s *Server) remoteFailed(me serf.MemberEvent) {
-}
+	for _, m := range me.Members {
+		ok, dc, port := s.isConsulServer(m)
+		if !ok {
+			continue
+		}
+		var addr net.Addr = &net.TCPAddr{IP: m.Addr, Port: port}
+		s.logger.Printf("[INFO] Removing Consul server (Datacenter: %s) (Addr: %s)", dc, addr)
 
-// remoteEvent is used to handle events on the wan serf cluster
+		// Remove the server if known
-func (s *Server) remoteEvent(ue serf.UserEvent) {
+		s.remoteLock.Lock()
+		existing := s.remoteConsuls[dc]
+		n := len(existing)
+		for i := 0; i < n; i++ {
+			if existing[i].String() == addr.String() {
+				existing[i], existing[n-1] = existing[n-1], nil
+				existing = existing[:n-1]
+				n--
+				break
+			}
+		}
+
+		// Trim the list if all known consuls are dead
+		if n == 0 {
+			delete(s.remoteConsuls, dc)
+		} else {
+			s.remoteConsuls[dc] = existing
+		}
+		s.remoteLock.Unlock()
+	}
 }
 
 // Returns if a member is a consul server. Returns a bool,

consul/server.go

@@ -50,6 +50,11 @@ type Server struct {
 	raftStore     *raft.SQLiteStore
 	raftTransport *raft.NetworkTransport
 
+	// remoteConsuls is used to track the known consuls in
+	// remote data centers. Used to do DC forwarding.
+	remoteConsuls map[string][]net.Addr
+	remoteLock    sync.RWMutex
+
 	// rpcClients is used to track active clients
 	rpcClients    map[net.Conn]struct{}
 	rpcClientLock sync.Mutex
@@ -94,6 +99,7 @@ func NewServer(config *Config) (*Server, error) {
 		eventChLAN:    make(chan serf.Event, 256),
 		eventChWAN:    make(chan serf.Event, 256),
 		logger:        logger,
+		remoteConsuls: make(map[string][]net.Addr),
 		rpcClients:    make(map[net.Conn]struct{}),
 		rpcServer:     rpc.NewServer(),
 		shutdownCh:    make(chan struct{}),

consul/server_test.go

@@ -25,8 +25,13 @@ func tmpDir(t *testing.T) string {
 }
 
 func testServer(t *testing.T) (string, *Server) {
+	return testServerDC(t, "dc1")
+}
+
+func testServerDC(t *testing.T, dc string) (string, *Server) {
 	dir := tmpDir(t)
 	config := DefaultConfig()
+	config.Datacenter = dc
 	config.DataDir = dir
 
 	// Adjust the ports
@@ -108,7 +113,7 @@ func TestServer_JoinWAN(t *testing.T) {
 	defer os.RemoveAll(dir1)
 	defer s1.Shutdown()
 
-	dir2, s2 := testServer(t)
+	dir2, s2 := testServerDC(t, "dc2")
 	defer os.RemoveAll(dir2)
 	defer s2.Shutdown()
 
@@ -127,6 +132,17 @@ func TestServer_JoinWAN(t *testing.T) {
 	if len(s2.WANMembers()) != 2 {
 		t.Fatalf("bad len")
 	}
+
+	time.Sleep(10 * time.Millisecond)
+
+	// Check the remoteConsuls has both
+	if len(s1.remoteConsuls) != 2 {
+		t.Fatalf("remote consul missing")
+	}
+
+	if len(s2.remoteConsuls) != 2 {
+		t.Fatalf("remote consul missing")
+	}
 }
 
 func TestServer_Leave(t *testing.T) {