add recorder for serial handler

handler/serial/conn.go

@@ -0,0 +1,44 @@
+package serial
+
+import (
+	"bytes"
+	"context"
+	"encoding/hex"
+	"net"
+	"time"
+
+	"github.com/go-gost/core/recorder"
+)
+
+type recorderConn struct {
+	net.Conn
+	recorder recorder.Recorder
+}
+
+func (c *recorderConn) Read(b []byte) (n int, err error) {
+	n, err = c.Conn.Read(b)
+
+	if n > 0 && c.recorder != nil {
+		var buf bytes.Buffer
+		buf.WriteByte('>')
+		buf.WriteString(time.Now().Format("2006-01-02 15:04:05.000"))
+		buf.WriteByte('\n')
+		buf.WriteString(hex.Dump(b[:n]))
+		c.recorder.Record(context.Background(), buf.Bytes())
+	}
+
+	return
+}
+
+func (c *recorderConn) Write(b []byte) (int, error) {
+	if c.recorder != nil {
+		var buf bytes.Buffer
+		buf.WriteByte('<')
+		buf.WriteString(time.Now().Format("2006-01-02 15:04:05.000"))
+		buf.WriteByte('\n')
+		buf.WriteString(hex.Dump(b))
+		c.recorder.Record(context.Background(), buf.Bytes())
+	}
+	return c.Conn.Write(b)
+
+}