From 6f0b4aaf31cb8c52501df837ed1a20e78d04f230 Mon Sep 17 00:00:00 2001
From: Shelikhoo <xiaokangwang@outlook.com>
Date: Sat, 11 Jun 2016 22:22:43 +0800
Subject: [PATCH] KCP: sorrgated Listener and conn

---
 transport/hub/kcp.go | 104 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100644 transport/hub/kcp.go

diff --git a/transport/hub/kcp.go b/transport/hub/kcp.go
new file mode 100644
index 00000000..29ee1b5a
--- /dev/null
+++ b/transport/hub/kcp.go
@@ -0,0 +1,104 @@
+package hub
+
+import (
+	"errors"
+	"net"
+	"time"
+
+	"github.com/v2ray/v2ray-core/common/log"
+	"github.com/v2ray/v2ray-core/transport/hub/kcpv"
+	"github.com/xtaci/kcp-go"
+)
+
+type KCPVlistener struct {
+	lst  *kcp.Listener
+	conf *kcpv.Config
+}
+
+func (kvl *KCPVlistener) Accept() (*KCPVconn, error) {
+	conn, err := kvl.lst.Accept()
+	if err != nil {
+		return nil, err
+	}
+	nodelay, interval, resend, nc := 0, 40, 0, 0
+	if kvl.conf.Mode != "manual" {
+		switch kvl.conf.Mode {
+		case "normal":
+			nodelay, interval, resend, nc = 0, 30, 2, 1
+		case "fast":
+			nodelay, interval, resend, nc = 0, 20, 2, 1
+		case "fast2":
+			nodelay, interval, resend, nc = 1, 20, 2, 1
+		case "fast3":
+			nodelay, interval, resend, nc = 1, 10, 2, 1
+		}
+	} else {
+		log.Error("kcp: Accepted Unsuccessfully: Manual mode is not supported.(yet!)")
+		return nil, errors.New("kcp: Manual Not Implemented")
+	}
+
+	conn.SetNoDelay(nodelay, interval, resend, nc)
+	conn.SetWindowSize(kvl.conf.AdvancedConfigs.Sndwnd, kvl.conf.AdvancedConfigs.Rcvwnd)
+	conn.SetMtu(kvl.conf.AdvancedConfigs.Mtu)
+	conn.SetACKNoDelay(kvl.conf.AdvancedConfigs.Acknodelay)
+	conn.SetDSCP(kvl.conf.AdvancedConfigs.Dscp)
+
+	kcv := &KCPVconn{hc: conn}
+	kcv.conf = kvl.conf
+	return kcv, nil
+}
+func (kvl *KCPVlistener) Close() error {
+	return kvl.lst.Close()
+}
+func (kvl *KCPVlistener) Addr() net.Addr {
+	return kvl.lst.Addr()
+}
+
+type KCPVconn struct {
+	hc         *kcp.UDPSession
+	conf       *kcpv.Config
+	conntokeep time.Time
+}
+
+func (kcpvc *KCPVconn) Read(b []byte) (int, error) {
+	ifb := time.Now().Add(time.Duration(kcpvc.conf.AdvancedConfigs.ReadTimeout) * time.Second)
+	if ifb.After(kcpvc.conntokeep) {
+		kcpvc.conntokeep = ifb
+	}
+	kcpvc.hc.SetDeadline(kcpvc.conntokeep)
+	return kcpvc.hc.Read(b)
+}
+
+func (kcpvc *KCPVconn) Write(b []byte) (int, error) {
+	ifb := time.Now().Add(time.Duration(kcpvc.conf.AdvancedConfigs.WriteTimeout) * time.Second)
+	if ifb.After(kcpvc.conntokeep) {
+		kcpvc.conntokeep = ifb
+	}
+	kcpvc.hc.SetDeadline(kcpvc.conntokeep)
+	return kcpvc.hc.Write(b)
+}
+
+func (kcpvc *KCPVconn) Close() error {
+
+	return kcpvc.hc.Close()
+}
+
+func (kcpvc *KCPVconn) LocalAddr() net.Addr {
+	return kcpvc.hc.LocalAddr()
+}
+
+func (kcpvc *KCPVconn) RemoteAddr() net.Addr {
+	return kcpvc.hc.RemoteAddr()
+}
+
+func (kcpvc *KCPVconn) SetDeadline(t time.Time) error {
+	return kcpvc.hc.SetDeadline(t)
+}
+
+func (kcpvc *KCPVconn) SetReadDeadline(t time.Time) error {
+	return kcpvc.hc.SetReadDeadline(t)
+}
+
+func (kcpvc *KCPVconn) SetWriteDeadline(t time.Time) error {
+	return kcpvc.hc.SetWriteDeadline(t)
+}