frp/vendor/github.com/fatedier/golib/net/conn.go

65 lines
1.5 KiB
Go

// Copyright 2018 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 net
import (
"bytes"
"io"
"net"
)
type SharedConn struct {
net.Conn
buf *bytes.Buffer
}
// the bytes you read in io.Reader, will be reserved in SharedConn
func NewSharedConn(conn net.Conn) (*SharedConn, io.Reader) {
sc := &SharedConn{
Conn: conn,
buf: bytes.NewBuffer(make([]byte, 0, 1024)),
}
return sc, io.TeeReader(conn, sc.buf)
}
func NewSharedConnSize(conn net.Conn, bufSize int) (*SharedConn, io.Reader) {
sc := &SharedConn{
Conn: conn,
buf: bytes.NewBuffer(make([]byte, 0, bufSize)),
}
return sc, io.TeeReader(conn, sc.buf)
}
// Not thread safety.
func (sc *SharedConn) Read(p []byte) (n int, err error) {
if sc.buf == nil {
return sc.Conn.Read(p)
}
n, err = sc.buf.Read(p)
if err == io.EOF {
sc.buf = nil
var n2 int
n2, err = sc.Conn.Read(p[n:])
n += n2
}
return
}
func (sc *SharedConn) ResetBuf(buffer []byte) (err error) {
sc.buf.Reset()
_, err = sc.buf.Write(buffer)
return err
}