rename models to pkg (#2005)

pkg/util/net/kcp.go

@@ -0,0 +1,99 @@
+// 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"
+
+	kcp "github.com/fatedier/kcp-go"
+)
+
+type KCPListener struct {
+	listener  net.Listener
+	acceptCh  chan net.Conn
+	closeFlag bool
+}
+
+func ListenKcp(bindAddr string, bindPort int) (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{
+		listener:  listener,
+		acceptCh:  make(chan net.Conn),
+		closeFlag: false,
+	}
+
+	go func() {
+		for {
+			conn, err := listener.AcceptKCP()
+			if err != nil {
+				if l.closeFlag {
+					close(l.acceptCh)
+					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.acceptCh <- conn
+		}
+	}()
+	return l, err
+}
+
+func (l *KCPListener) Accept() (net.Conn, error) {
+	conn, ok := <-l.acceptCh
+	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
+}
+
+func (l *KCPListener) Addr() net.Addr {
+	return l.listener.Addr()
+}
+
+func NewKCPConnFromUDP(conn *net.UDPConn, connected bool, raddr string) (net.Conn, error) {
+	kcpConn, err := kcp.NewConnEx(1, connected, raddr, nil, 10, 3, conn)
+	if err != nil {
+		return nil, err
+	}
+	kcpConn.SetStreamMode(true)
+	kcpConn.SetWriteDelay(true)
+	kcpConn.SetNoDelay(1, 20, 2, 1)
+	kcpConn.SetMtu(1350)
+	kcpConn.SetWindowSize(1024, 1024)
+	kcpConn.SetACKNoDelay(false)
+	return kcpConn, nil
+}