start refactoring

models/proto/tcp/tcp.go

@@ -0,0 +1,89 @@
+// Copyright 2017 fatedier, fatedier@gmail.com
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package tcp
+
+import (
+	"io"
+
+	"github.com/golang/snappy"
+
+	"github.com/fatedier/frp/utils/crypto"
+)
+
+func WithEncryption(rwc io.ReadWriteCloser, key []byte) (res io.ReadWriteCloser, err error) {
+	var (
+		r io.Reader
+		w io.Writer
+	)
+	r, err = crypto.NewReader(rwc, key)
+	if err != nil {
+		return
+	}
+	w, err = crypto.NewWriter(rwc, key)
+	if err != nil {
+		return
+	}
+	res = WrapReadWriteCloser(r, w)
+	return
+}
+
+func WithCompression(rwc io.ReadWriteCloser) (res io.ReadWriteCloser) {
+	var (
+		r io.Reader
+		w io.Writer
+	)
+	r = snappy.NewReader(rwc)
+	w = snappy.NewWriter(rwc)
+	res = WrapReadWriteCloser(r, w)
+	return
+}
+
+func WrapReadWriteCloser(r io.Reader, w io.Writer) io.ReadWriteCloser {
+	return &ReadWriteCloser{
+		r: r,
+		w: w,
+	}
+}
+
+type ReadWriteCloser struct {
+	r io.Reader
+	w io.Writer
+}
+
+func (rwc *ReadWriteCloser) Read(p []byte) (n int, err error) {
+	return rwc.r.Read(p)
+}
+
+func (rwc *ReadWriteCloser) Write(p []byte) (n int, err error) {
+	return rwc.w.Write(p)
+}
+
+func (rwc *ReadWriteCloser) Close() (errRet error) {
+	var err error
+	if rc, ok := rwc.r.(io.Closer); ok {
+		err = rc.Close()
+		if err != nil {
+			errRet = err
+		}
+	}
+
+	if wc, ok := rwc.w.(io.Closer); ok {
+		err = wc.Close()
+		if err != nil {
+			errRet = err
+		}
+	}
+	return
+}