add plugin http handler (#7289)

plugin/rpcplugin/muxer.go

@@ -114,20 +114,22 @@ func (m *Muxer) write(p []byte, sid int64) (int, error) {
 	if m.IsClosed() {
 		return 0, fmt.Errorf("muxer closed")
 	}
-	buf := make([]byte, 10)
-	n := binary.PutVarint(buf, sid)
+	var buf [10]byte
+	n := binary.PutVarint(buf[:], sid)
 	if _, err := m.conn.Write(buf[:n]); err != nil {
 		m.shutdown(err)
 		return 0, err
 	}
-	n = binary.PutVarint(buf, int64(len(p)))
+	n = binary.PutVarint(buf[:], int64(len(p)))
 	if _, err := m.conn.Write(buf[:n]); err != nil {
 		m.shutdown(err)
 		return 0, err
 	}
-	if _, err := m.conn.Write(p); err != nil {
-		m.shutdown(err)
-		return 0, err
+	if len(p) > 0 {
+		if _, err := m.conn.Write(p); err != nil {
+			m.shutdown(err)
+			return 0, err
+		}
 	}
 	return len(p), nil
 }
@@ -180,7 +182,11 @@ func (m *Muxer) loop() error {
 			}
 			continue
 		}
-		_, err = io.CopyN(&stream.readBuf, reader, len)
+		if len == 0 {
+			stream.remoteClosed = true
+		} else {
+			_, err = io.CopyN(&stream.readBuf, reader, len)
+		}
 		stream.mutex.Unlock()
 		if err != nil {
 			return err
@@ -207,13 +213,14 @@ func (m *Muxer) shutdown(err error) {
 }
 
 type muxerStream struct {
-	id       int64
-	muxer    *Muxer
-	readBuf  bytes.Buffer
-	mutex    *sync.Mutex
-	readWake *sync.Cond
-	isClosed bool
-	closeErr error
+	id           int64
+	muxer        *Muxer
+	readBuf      bytes.Buffer
+	mutex        *sync.Mutex
+	readWake     *sync.Cond
+	isClosed     bool
+	remoteClosed bool
+	closeErr     error
 }
 
 func (s *muxerStream) Read(p []byte) (int, error) {
@@ -225,8 +232,9 @@ func (s *muxerStream) Read(p []byte) (int, error) {
 		} else if s.isClosed {
 			return 0, io.EOF
 		} else if s.readBuf.Len() > 0 {
-			n, err := s.readBuf.Read(p)
-			return n, err
+			return s.readBuf.Read(p)
+		} else if s.remoteClosed {
+			return 0, io.EOF
 		}
 		s.readWake.Wait()
 	}
@@ -245,6 +253,7 @@ func (s *muxerStream) Close() error {
 	s.mutex.Lock()
 	defer s.mutex.Unlock()
 	if !s.isClosed {
+		s.muxer.write(nil, s.id)
 		s.isClosed = true
 		s.muxer.rm(s.id)
 	}