add path option support for grpc

listener/grpc/listener.go

@@ -66,11 +66,11 @@ func (l *grpcListener) Init(md md.Metadata) (err error) {
 	l.cqueue = make(chan net.Conn, l.md.backlog)
 	l.errChan = make(chan error, 1)
 
-	pb.RegisterGostTunelServer(l.server, &server{
+	pb.RegisterGostTunelServerX(l.server, &server{
 		cqueue:    l.cqueue,
 		localAddr: l.addr,
 		logger:    l.options.Logger,
-	})
+	}, l.md.path)
 
 	go func() {
 		err := l.server.Serve(ln)

listener/grpc/metadata.go

@@ -12,12 +12,14 @@ const (
 type metadata struct {
 	backlog  int
 	insecure bool
+	path     string
 }
 
 func (l *grpcListener) parseMetadata(md mdata.Metadata) (err error) {
 	const (
 		backlog  = "backlog"
 		insecure = "grpcInsecure"
+		path     = "path"
 	)
 
 	l.md.backlog = mdx.GetInt(md, backlog)
@@ -26,5 +28,6 @@ func (l *grpcListener) parseMetadata(md mdata.Metadata) (err error) {
 	}
 
 	l.md.insecure = mdx.GetBool(md, insecure)
+	l.md.path = mdx.GetString(md, path)
 	return
 }