vendor: update grpc

cmd/vendor/google.golang.org/grpc/server.go

@@ -73,6 +73,7 @@ type ServiceDesc struct {
 	HandlerType interface{}
 	Methods     []MethodDesc
 	Streams     []StreamDesc
+	Metadata    interface{}
 }
 
 // service consists of the information of the server serving this service and
@@ -115,12 +116,14 @@ func CustomCodec(codec Codec) ServerOption {
 	}
 }
 
+// RPCCompressor returns a ServerOption that sets a compressor for outbound message.
 func RPCCompressor(cp Compressor) ServerOption {
 	return func(o *options) {
 		o.cp = cp
 	}
 }
 
+// RPCDecompressor returns a ServerOption that sets a decompressor for inbound message.
 func RPCDecompressor(dc Decompressor) ServerOption {
 	return func(o *options) {
 		o.dc = dc
@@ -462,6 +465,10 @@ func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.
 			}
 		}()
 	}
+	if s.opts.cp != nil {
+		// NOTE: this needs to be ahead of all handling, https://github.com/grpc/grpc-go/issues/686.
+		stream.SetSendCompress(s.opts.cp.Type())
+	}
 	p := &parser{r: stream}
 	for {
 		pf, req, err := p.recvMsg()
@@ -547,9 +554,6 @@ func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.
 			Last:  true,
 			Delay: false,
 		}
-		if s.opts.cp != nil {
-			stream.SetSendCompress(s.opts.cp.Type())
-		}
 		if err := s.sendResponse(t, stream, reply, s.opts.cp, opts); err != nil {
 			switch err := err.(type) {
 			case transport.ConnectionError: