Change internal message format

input_tcp.go

@@ -2,9 +2,11 @@ package main
 
 import (
 	"bufio"
-	"io"
 	"log"
 	"net"
+	"encoding/hex"
+	"fmt"
+	"os"
 )
 
 // Can be tested using nc tool:
@@ -59,24 +61,18 @@ func (i *TCPInput) handleConnection(conn net.Conn) {
 	defer conn.Close()
 
 	reader := bufio.NewReader(conn)
+	scanner := bufio.NewScanner(reader)
 
-	for {
-		buf, err := reader.ReadBytes('¶')
-		if err == io.EOF {
-			return
-		} else if err != nil {
-			log.Println("Unexpected error in input tcp connection", err)
-			return
-		}
-		buf_len := len(buf)
-		if buf_len > 0 {
-			new_buf_len := len(buf) - 2
-			if new_buf_len > 0 {
-				new_buf := make([]byte, new_buf_len)
-				copy(new_buf, buf[:new_buf_len])
-				i.data <- new_buf
-			}
-		}
+	for scanner.Scan() {
+		encodedPayload := scanner.Bytes()
+		// Hex encoding always 2x number of bytes
+		decoded := make([]byte, len(encodedPayload)/2)
+		hex.Decode(decoded, encodedPayload)
+		i.data <- decoded
+	}
+
+	if err := scanner.Err(); err != nil {
+		fmt.Fprintln(os.Stderr, "Unexpected error in input tcp connection:", err)
 	}
 }
 

input_tcp_test.go

@@ -6,6 +6,7 @@ import (
 	"net"
 	"sync"
 	"testing"
+	"encoding/hex"
 )
 
 func TestTCPInput(t *testing.T) {
@@ -38,10 +39,10 @@ func TestTCPInput(t *testing.T) {
 
 	for i := 0; i < 100; i++ {
 		wg.Add(1)
-		new_buf := make([]byte, len(msg)+2)
-		msg = append(msg, []byte("¶")...)
-		copy(new_buf, msg)
-		conn.Write(new_buf)
+
+		encoded := make([]byte, len(msg)*2 + 1)
+		hex.Encode(encoded, msg)
+		conn.Write(append(encoded, '\n'))
 	}
 
 	wg.Wait()

output_tcp.go

@@ -6,6 +6,7 @@ import (
 	"log"
 	"net"
 	"time"
+	"encoding/hex"
 )
 
 type TCPOutput struct {
@@ -51,10 +52,11 @@ func (o *TCPOutput) worker() {
 }
 
 func (o *TCPOutput) Write(data []byte) (n int, err error) {
-	new_buf := make([]byte, len(data)+2)
-	data = append(data, []byte("¶")...)
-	copy(new_buf, data)
-	o.buf <- new_buf
+	// Hex encoding always 2x number of bytes
+	encoded := make([]byte, len(data)*2 + 1)
+	hex.Encode(encoded, data)
+	o.buf <- append(encoded, '\n')
+
 	if Settings.outputTCPStats {
 		o.bufStats.Write(len(o.buf))
 	}

output_tcp_test.go

@@ -7,6 +7,7 @@ import (
 	"net"
 	"sync"
 	"testing"
+	"encoding/hex"
 )
 
 func TestTCPOutput(t *testing.T) {
@@ -48,17 +49,14 @@ func startTCP(cb func([]byte)) net.Listener {
 
 			go func() {
 				reader := bufio.NewReader(conn)
-				for {
-					buf, err := reader.ReadBytes('¶')
-					new_buf_len := len(buf) - 2
-					new_buf := make([]byte, new_buf_len)
-					copy(new_buf, buf[:new_buf_len])
-					if err != nil {
-						if err != io.EOF {
-							log.Printf("error: %s\n", err)
-						}
-					}
-					cb(new_buf)
+				scanner := bufio.NewScanner(reader)
+
+				for scanner.Scan() {
+					encodedPayload := scanner.Bytes()
+					// Hex encoding always 2x number of bytes
+					decoded := make([]byte, len(encodedPayload)/2)
+					hex.Decode(decoded, encodedPayload)
+					cb(decoded)
 				}
 			}()
 		}