fix(registry): add timeout validation

contrib/registry/consul/registry.go

@@ -215,10 +215,17 @@ func (r *Registry) Watch(ctx context.Context, name string) (registry.Watcher, er
 }
 
 func (r *Registry) resolve(ctx context.Context, ss *serviceSet) error {
-	timeoutCtx, cancel := context.WithTimeout(ctx, r.timeout)
-	defer cancel()
+	listServices := r.cli.Service
+	if r.timeout > 0 {
+		listServices = func(ctx context.Context, service string, index uint64, passingOnly bool) ([]*registry.ServiceInstance, uint64, error) {
+			timeoutCtx, cancel := context.WithTimeout(ctx, r.timeout)
+			defer cancel()
 
-	services, idx, err := r.cli.Service(timeoutCtx, ss.serviceName, 0, true)
+			return r.cli.Service(timeoutCtx, service, index, passingOnly)
+		}
+	}
+
+	services, idx, err := listServices(ctx, ss.serviceName, 0, true)
 	if err != nil {
 		return err
 	}
@@ -232,9 +239,7 @@ func (r *Registry) resolve(ctx context.Context, ss *serviceSet) error {
 		for {
 			select {
 			case <-ticker.C:
-				timeoutCtx, cancel := context.WithTimeout(context.Background(), r.timeout)
-				tmpService, tmpIdx, err := r.cli.Service(timeoutCtx, ss.serviceName, idx, true)
-				cancel()
+				tmpService, tmpIdx, err := listServices(context.Background(), ss.serviceName, idx, true)
 				if err != nil {
 					time.Sleep(time.Second)
 					continue

transport/grpc/resolver/discovery/builder.go

@@ -94,11 +94,16 @@ func (b *builder) Build(target resolver.Target, cc resolver.ClientConn, _ resolv
 	}()
 
 	var err error
-	select {
-	case <-done:
+	if b.timeout > 0 {
+		select {
+		case <-done:
+			err = watchRes.err
+		case <-time.After(b.timeout):
+			err = ErrWatcherCreateTimeout
+		}
+	} else {
+		<-done
 		err = watchRes.err
-	case <-time.After(b.timeout):
-		err = ErrWatcherCreateTimeout
 	}
 	if err != nil {
 		cancel()

transport/grpc/resolver/discovery/builder_test.go

@@ -107,7 +107,7 @@ func TestBuilder_Build(t *testing.T) {
 		&mockConn{},
 		resolver.BuildOptions{},
 	)
-	if err == nil {
-		t.Errorf("expected error, got %v", err)
+	if err != nil {
+		t.Errorf("expected no error, got %v", err)
 	}
 }