add grpc interceptor option (#990)

transport/grpc/client.go

@@ -48,6 +48,13 @@ func WithDiscovery(d registry.Discovery) ClientOption {
 	}
 }
 
+// WithUnaryInterceptor returns a DialOption that specifies the interceptor for unary RPCs.
+func WithUnaryInterceptor(in ...grpc.UnaryClientInterceptor) ClientOption {
+	return func(o *clientOptions) {
+		o.ints = in
+	}
+}
+
 // WithOptions with gRPC options.
 func WithOptions(opts ...grpc.DialOption) ClientOption {
 	return func(o *clientOptions) {
@@ -61,6 +68,7 @@ type clientOptions struct {
 	timeout    time.Duration
 	middleware middleware.Middleware
 	discovery  registry.Discovery
+	ints       []grpc.UnaryClientInterceptor
 	grpcOpts   []grpc.DialOption
 }
 
@@ -84,9 +92,15 @@ func dial(ctx context.Context, insecure bool, opts ...ClientOption) (*grpc.Clien
 	for _, o := range opts {
 		o(&options)
 	}
+	var ints = []grpc.UnaryClientInterceptor{
+		unaryClientInterceptor(options.middleware, options.timeout),
+	}
+	if len(options.ints) > 0 {
+		ints = append(ints, options.ints...)
+	}
 	var grpcOpts = []grpc.DialOption{
 		grpc.WithBalancerName(roundrobin.Name),
-		grpc.WithUnaryInterceptor(unaryClientInterceptor(options.middleware, options.timeout)),
+		grpc.WithChainUnaryInterceptor(ints...),
 	}
 	if options.discovery != nil {
 		grpcOpts = append(grpcOpts, grpc.WithResolvers(discovery.NewBuilder(options.discovery)))

transport/grpc/server.go

@@ -61,8 +61,7 @@ func Middleware(m ...middleware.Middleware) ServerOption {
 	}
 }
 
-// UnaryInterceptor returns a ServerOption that sets the UnaryServerInterceptor for the
+// UnaryInterceptor returns a ServerOption that sets the UnaryServerInterceptor for the server.
-// server.
 func UnaryInterceptor(in ...grpc.UnaryServerInterceptor) ServerOption {
 	return func(s *Server) {
 		s.ints = in

transport/http/client.go

@@ -145,7 +145,7 @@ func NewClient(ctx context.Context, opts ...ClientOption) (*Client, error) {
 		return nil, err
 	}
 	var r *resolver
-	if target.Endpoint != "" && options.discovery != nil {
+	if options.discovery != nil {
 		if target.Scheme == "discovery" {
 			if r, err = newResolver(ctx, options.discovery, target); err != nil {
 				return nil, fmt.Errorf("[http client] new resolver failed!err: %v", options.endpoint)