code refactor for common package

pkg/common/util/kcp/kcp.go

@@ -0,0 +1,34 @@
+package kcp
+
+import (
+	"net"
+
+	"github.com/golang/snappy"
+)
+
+type kcpCompStreamConn struct {
+	net.Conn
+	w *snappy.Writer
+	r *snappy.Reader
+}
+
+func KCPCompStreamConn(conn net.Conn) net.Conn {
+	return &kcpCompStreamConn{
+		Conn: conn,
+		w:    snappy.NewBufferedWriter(conn),
+		r:    snappy.NewReader(conn),
+	}
+}
+
+func (c *kcpCompStreamConn) Read(b []byte) (n int, err error) {
+	return c.r.Read(b)
+}
+
+func (c *kcpCompStreamConn) Write(b []byte) (n int, err error) {
+	n, err = c.w.Write(b)
+	if err != nil {
+		return
+	}
+	err = c.w.Flush()
+	return n, err
+}