frp/utils/net/kcp.go

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2017-06-04 19:56:21 +08:00
// 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 net
import (
"fmt"
"net"
"github.com/fatedier/frp/utils/log"
kcp "github.com/xtaci/kcp-go"
)
type KcpListener struct {
net.Addr
listener net.Listener
accept chan Conn
closeFlag bool
log.Logger
}
func ListenKcp(bindAddr string, bindPort int64) (l *KcpListener, err error) {
listener, err := kcp.ListenWithOptions(fmt.Sprintf("%s:%d", bindAddr, bindPort), nil, 10, 3)
if err != nil {
return l, err
}
listener.SetReadBuffer(4194304)
listener.SetWriteBuffer(4194304)
l = &KcpListener{
Addr: listener.Addr(),
listener: listener,
accept: make(chan Conn),
closeFlag: false,
Logger: log.NewPrefixLogger(""),
}
go func() {
for {
conn, err := listener.AcceptKCP()
if err != nil {
if l.closeFlag {
close(l.accept)
return
}
continue
}
conn.SetStreamMode(true)
conn.SetWriteDelay(true)
conn.SetNoDelay(1, 20, 2, 1)
conn.SetMtu(1350)
conn.SetWindowSize(1024, 1024)
conn.SetACKNoDelay(false)
l.accept <- WrapConn(conn)
}
}()
return l, err
}
func (l *KcpListener) Accept() (Conn, error) {
conn, ok := <-l.accept
if !ok {
return conn, fmt.Errorf("channel for kcp listener closed")
}
return conn, nil
}
func (l *KcpListener) Close() error {
if !l.closeFlag {
l.closeFlag = true
l.listener.Close()
}
return nil
}