vendor: upgrade grpc to v1.7.2

Signed-off-by: Gyu-Ho Lee <gyuhox@gmail.com>

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

@@ -116,6 +116,8 @@ type options struct {
 	keepalivePolicy       keepalive.EnforcementPolicy
 	initialWindowSize     int32
 	initialConnWindowSize int32
+	writeBufferSize       int
+	readBufferSize        int
 }
 
 var defaultServerOptions = options{
@@ -126,6 +128,22 @@ var defaultServerOptions = options{
 // A ServerOption sets options such as credentials, codec and keepalive parameters, etc.
 type ServerOption func(*options)
 
+// WriteBufferSize lets you set the size of write buffer, this determines how much data can be batched
+// before doing a write on the wire.
+func WriteBufferSize(s int) ServerOption {
+	return func(o *options) {
+		o.writeBufferSize = s
+	}
+}
+
+// ReadBufferSize lets you set the size of read buffer, this determines how much data can be read at most
+// for one read syscall.
+func ReadBufferSize(s int) ServerOption {
+	return func(o *options) {
+		o.readBufferSize = s
+	}
+}
+
 // InitialWindowSize returns a ServerOption that sets window size for stream.
 // The lower bound for window size is 64K and any value smaller than that will be ignored.
 func InitialWindowSize(s int32) ServerOption {
@@ -260,7 +278,7 @@ func StatsHandler(h stats.Handler) ServerOption {
 // handler that will be invoked instead of returning the "unimplemented" gRPC
 // error whenever a request is received for an unregistered service or method.
 // The handling function has full access to the Context of the request and the
-// stream, and the invocation passes through interceptors.
+// stream, and the invocation bypasses interceptors.
 func UnknownServiceHandler(streamHandler StreamHandler) ServerOption {
 	return func(o *options) {
 		o.unknownStreamDesc = &StreamDesc{
@@ -524,6 +542,8 @@ func (s *Server) serveHTTP2Transport(c net.Conn, authInfo credentials.AuthInfo)
 		KeepalivePolicy:       s.opts.keepalivePolicy,
 		InitialWindowSize:     s.opts.initialWindowSize,
 		InitialConnWindowSize: s.opts.initialConnWindowSize,
+		WriteBufferSize:       s.opts.writeBufferSize,
+		ReadBufferSize:        s.opts.readBufferSize,
 	}
 	st, err := transport.NewServerTransport("http2", c, config)
 	if err != nil {
@@ -891,9 +911,6 @@ func (s *Server) processStreamingRPC(t transport.ServerTransport, stream *transp
 		trInfo:                trInfo,
 		statsHandler:          sh,
 	}
-	if ss.cp != nil {
-		ss.cbuf = new(bytes.Buffer)
-	}
 	if trInfo != nil {
 		trInfo.tr.LazyLog(&trInfo.firstLine, false)
 		defer func() {