Refactor client codes to use similar, standardized API

clients/go/example.go

@@ -13,8 +13,8 @@ func main() {
 	}
 	defer pipeio.Close()
 
-	pipeio.HandleMessage(func(msg []byte) {
+	pipeio.Reader.SetMessageHandler(func(msg []byte) {
 		pipeio.Writer.SendMessage(msg)
 	})
-	pipeio.Run()
+	pipeio.Reader.Run()
 }

clients/go/pipeio/pipeio.go

@@ -9,8 +9,11 @@ import (
 type pipeReader struct {
 	pipe *os.File
 	scanner *bufio.Scanner
+	messageHandler messageHandlerFunc
 }
 
+type messageHandlerFunc func([]byte)
+
 func NewPipeReader(pipePath string) (*pipeReader, error) {
 	pipe, err := os.Open(pipePath)
 	scanner := bufio.NewScanner(pipe)
@@ -21,9 +24,28 @@ func NewPipeReader(pipePath string) (*pipeReader, error) {
 	return &pipeReader{
 		pipe: pipe,
 		scanner: scanner,
+		messageHandler: func([]byte){},
 	}, nil
 }
 
+func (preader *pipeReader) Close() {
+	preader.pipe.Close()
+}
+
+func (preader *pipeReader) SetMessageHandler(fun messageHandlerFunc) {
+	preader.messageHandler = fun
+}
+
+func (preader *pipeReader) Run() {
+	for {
+		msg := preader.RecvMessage()
+		if msg == nil {
+			break
+		}
+		preader.messageHandler(msg)
+	}
+}
+
 func (preader *pipeReader) RecvMessage() []byte {
 	if preader.scanner.Scan() {
 		return preader.scanner.Bytes()
@@ -31,10 +53,6 @@ func (preader *pipeReader) RecvMessage() []byte {
 	return nil
 }
 
-func (preader *pipeReader) Close() {
-	preader.pipe.Close()
-}
-
 
 type pipeWriter struct {
 	pipe *os.File
@@ -60,11 +78,8 @@ func (pwriter *pipeWriter) SendMessage(msg []byte) {
 type pipeIO struct {
 	Reader pipeReader
 	Writer pipeWriter
-	handleMessage handleMessageFunc
 }
 
-type handleMessageFunc func([]byte)
-
 func NewPipeIO(inPipePath, outPipePath string) (*pipeIO, error) {
 	reader, err := NewPipeReader(inPipePath)
 	if err != nil {
@@ -77,7 +92,6 @@ func NewPipeIO(inPipePath, outPipePath string) (*pipeIO, error) {
 	return &pipeIO{
 		Reader: *reader,
 		Writer: *writer,
-		handleMessage: func([]byte){},
 	}, nil
 }
 
@@ -85,17 +99,3 @@ func (pipeio *pipeIO) Close() {
 	pipeio.Reader.Close()
 	pipeio.Writer.Close()
 }
-
-func (pipeio *pipeIO) Run() {
-	for {
-		msg := pipeio.Reader.RecvMessage()
-		if msg == nil {
-			break
-		}
-		pipeio.handleMessage(msg)
-	}
-}
-
-func (pipeio *pipeIO) HandleMessage(fun handleMessageFunc) {
-	pipeio.handleMessage = fun
-}