fixes https://github.com/micro/go-micro/issues/793

registry/consul/watcher.go

@@ -163,7 +163,7 @@ func (cw *consulWatcher) serviceHandler(idx uint64, data interface{}) {
 
 			// it's an update rather than creation
 			if len(nodes) > 0 {
-				delService := oldService
+				delService := registry.CopyService(oldService)
 				delService.Nodes = nodes
 				cw.next <- &registry.Result{Action: "delete", Service: delService}
 			}

registry/util.go

@@ -48,36 +48,38 @@ func delNodes(old, del []*Node) []*Node {
 	return nodes
 }
 
+// CopyService make a copy of service
+func CopyService(service *Service) *Service {
+	// copy service
+	s := new(Service)
+	*s = *service
+
+	// copy nodes
+	nodes := make([]*Node, len(service.Nodes))
+	for j, node := range service.Nodes {
+		n := new(Node)
+		*n = *node
+		nodes[j] = n
+	}
+	s.Nodes = nodes
+
+	// copy endpoints
+	eps := make([]*Endpoint, len(service.Endpoints))
+	for j, ep := range service.Endpoints {
+		e := new(Endpoint)
+		*e = *ep
+		eps[j] = e
+	}
+	s.Endpoints = eps
+	return s
+}
+
 // Copy makes a copy of services
 func Copy(current []*Service) []*Service {
 	services := make([]*Service, len(current))
 	for i, service := range current {
-		// copy service
+		services[i] = CopyService(service)
-		s := new(Service)
-		*s = *service
-
-		// copy nodes
-		nodes := make([]*Node, len(service.Nodes))
-		for j, node := range service.Nodes {
-			n := new(Node)
-			*n = *node
-			nodes[j] = n
-		}
-		s.Nodes = nodes
-
-		// copy endpoints
-		eps := make([]*Endpoint, len(service.Endpoints))
-		for j, ep := range service.Endpoints {
-			e := new(Endpoint)
-			*e = *ep
-			eps[j] = e
-		}
-		s.Endpoints = eps
-
-		// append service
-		services[i] = s
 	}
-
 	return services
 }