add server side tracing

server.go

@@ -43,6 +43,7 @@ import (
 	"sync"
 
 	"golang.org/x/net/context"
+	"golang.org/x/net/trace"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/credentials"
 	"google.golang.org/grpc/grpclog"
@@ -241,13 +242,21 @@ func (s *Server) sendResponse(t transport.ServerTransport, stream *transport.Str
 		//
 		// TODO(zhaoq): There exist other options also such as only closing the
 		// faulty stream locally and remotely (Other streams can keep going). Find
-		// the optimal option.
+		// the optimal option..M
 		grpclog.Fatalf("grpc: Server failed to encode response %v", err)
 	}
 	return t.Write(stream, p, opts)
 }
 
-func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.Stream, srv *service, md *MethodDesc) {
+func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.Stream, srv *service, md *MethodDesc, srvn string) {
+	var traceInfo traceInfo
+	if EnableTracing {
+		traceInfo.tr = trace.New("Recv."+methodFamily(srvn), srvn)
+		//	traceInfo.tr = trace.New("Recv."+methodFamily(md.MethodName), md.MethodName)
+		defer traceInfo.tr.Finish()
+		traceInfo.firstLine.client = false
+		traceInfo.tr.LazyLog(&traceInfo.firstLine, false)
+	}
 	p := &parser{s: stream}
 	for {
 		pf, req, err := p.recvMsg()
@@ -268,6 +277,9 @@ func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.
 			}
 			return
 		}
+		if EnableTracing {
+			traceInfo.tr.LazyLog(&payload{sent: false, msg: req}, true)
+		}
 		switch pf {
 		case compressionNone:
 			statusCode := codes.OK
@@ -303,18 +315,27 @@ func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.
 				}
 			}
 			t.WriteStatus(stream, statusCode, statusDesc)
+			if EnableTracing {
+				traceInfo.tr.LazyLog(&payload{sent: true, msg: reply}, true)
+			}
 		default:
 			panic(fmt.Sprintf("payload format to be supported: %d", pf))
 		}
 	}
 }
 
-func (s *Server) processStreamingRPC(t transport.ServerTransport, stream *transport.Stream, srv *service, sd *StreamDesc) {
+func (s *Server) processStreamingRPC(t transport.ServerTransport, stream *transport.Stream, srv *service, sd *StreamDesc, srvn string) {
 	ss := &serverStream{
 		t:       t,
 		s:       stream,
 		p:       &parser{s: stream},
 		codec:   s.opts.codec,
+		tracing: EnableTracing,
+	}
+	if ss.tracing {
+		ss.traceInfo.tr = trace.New("Recv."+methodFamily(srvn), srvn)
+		ss.traceInfo.firstLine.client = false
+		ss.traceInfo.tr.LazyLog(&ss.traceInfo.firstLine, false)
 	}
 	if appErr := sd.Handler(srv.server, ss); appErr != nil {
 		if err, ok := appErr.(rpcError); ok {
@@ -326,10 +347,17 @@ func (s *Server) processStreamingRPC(t transport.ServerTransport, stream *transp
 		}
 	}
 	t.WriteStatus(ss.s, ss.statusCode, ss.statusDesc)
+	if ss.tracing {
+		ss.mu.Lock()
+		ss.traceInfo.tr.Finish()
+		ss.traceInfo.tr = nil
+		ss.mu.Unlock()
+	}
 }
 
 func (s *Server) handleStream(t transport.ServerTransport, stream *transport.Stream) {
 	sm := stream.Method()
+	srvn := sm
 	if sm != "" && sm[0] == '/' {
 		sm = sm[1:]
 	}
@@ -351,11 +379,12 @@ func (s *Server) handleStream(t transport.ServerTransport, stream *transport.Str
 	}
 	// Unary RPC or Streaming RPC?
 	if md, ok := srv.md[method]; ok {
-		s.processUnaryRPC(t, stream, srv, md)
+
+		s.processUnaryRPC(t, stream, srv, md, srvn)
 		return
 	}
 	if sd, ok := srv.sd[method]; ok {
-		s.processStreamingRPC(t, stream, srv, sd)
+		s.processStreamingRPC(t, stream, srv, sd, srvn)
 		return
 	}
 	if err := t.WriteStatus(stream, codes.Unimplemented, fmt.Sprintf("unknown method %v", method)); err != nil {

stream.go

@@ -282,6 +282,9 @@ type serverStream struct {
 	codec      Codec
 	statusCode codes.Code
 	statusDesc string
+	tracing    bool
+	mu         sync.Mutex
+	traceInfo  traceInfo
 }
 
 func (ss *serverStream) Context() context.Context {
@@ -301,6 +304,13 @@ func (ss *serverStream) SetTrailer(md metadata.MD) {
 }
 
 func (ss *serverStream) SendMsg(m interface{}) error {
+	if ss.tracing {
+		ss.mu.Lock()
+		if ss.traceInfo.tr != nil {
+			ss.traceInfo.tr.LazyLog(&payload{sent: true, msg: m}, true)
+		}
+		ss.mu.Unlock()
+	}
 	out, err := encode(ss.codec, m, compressionNone)
 	if err != nil {
 		err = transport.StreamErrorf(codes.Internal, "grpc: %v", err)
@@ -310,5 +320,14 @@ func (ss *serverStream) SendMsg(m interface{}) error {
 }
 
 func (ss *serverStream) RecvMsg(m interface{}) error {
+	defer func() {
+		if ss.tracing {
+			ss.mu.Lock()
+			if ss.traceInfo.tr != nil {
+				ss.traceInfo.tr.LazyLog(&payload{sent: false, msg: m}, true)
+			}
+			ss.mu.Unlock()
+		}
+	}()
 	return recv(ss.p, ss.codec, m)
 }