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connection_windows.go
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connection_windows.go
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// Copyright 2019 Andy Pan. All rights reserved.
// Copyright 2018 Joshua J Baker. All rights reserved.
// Use of this source code is governed by an MIT-style
// license that can be found in the LICENSE file.
//go:build windows
// +build windows
package gnet
import (
"net"
"sync"
"sync/atomic"
"time"
"github.com/luyu6056/gnet/pkg/pool/byteslice"
"github.com/luyu6056/tls"
)
const (
connStateOk = 1
connStateCloseReady = -0
connStateCloseLazyout = -1
connStateCloseOk = -2
)
type stderr struct {
c *stdConn
err error
}
type tcpClose struct {
c *stdConn
err error
}
type wakeReq struct {
c *stdConn
}
type tcpIn struct {
c *stdConn
buf *tls.MsgBuffer
}
type udpIn struct {
c *stdConn
}
type stdConn struct {
ctx interface{} // user-defined context
conn net.Conn // original connection
loop *eventloop // owner loop
state int32 // connState
codec ICodec // codec for TCP
localAddr net.Addr // local server addr
remoteAddr net.Addr // remote peer addr
inboundBuffer, outboundBuffer *tls.MsgBuffer // buffer for data from client
tlsconn *tls.Conn
inboundBufferWrite func([]byte) (int, error)
readframe func() []byte
flushWait chan int
flushWaitNum int64
writetimeout int
}
var msgbufpool = sync.Pool{New: func() interface{} {
return &tls.MsgBuffer{}
}}
func newTCPConn(conn net.Conn, lp *eventloop) *stdConn {
c := &stdConn{
conn: conn,
loop: lp,
codec: lp.codec,
localAddr: conn.LocalAddr(),
remoteAddr: conn.RemoteAddr(),
inboundBuffer: nil,
outboundBuffer: msgbufpool.Get().(*tls.MsgBuffer),
flushWait: make(chan int),
state: connStateOk,
writetimeout: lp.srv.opts.WriteTimeOut,
}
c.inboundBufferWrite = func(b []byte) (int, error) {
return c.inboundBuffer.Write(b)
}
c.readframe = c.read
return c
}
func (c *stdConn) releaseTCP() {
c.loop.outChan <- out{c, byteslice.Get(0)} //修改至outchan进行回收
}
func newUDPConn(lp *eventloop, localAddr, remoteAddr net.Addr) *stdConn {
return &stdConn{
loop: lp,
localAddr: localAddr,
remoteAddr: remoteAddr,
inboundBuffer: msgbufpool.Get().(*tls.MsgBuffer),
}
}
func (c *stdConn) releaseUDP() {
c.ctx = nil
c.localAddr = nil
if c.inboundBuffer != nil {
c.inboundBuffer.Reset()
msgbufpool.Put(c.inboundBuffer)
c.inboundBuffer = nil
}
}
func (c *stdConn) tlsread() (frame []byte) {
var err error
if !c.tlsconn.HandshakeComplete() {
//先判断是否足够一条消息
data := c.tlsconn.RawData()
if len(data) < 5 || len(data) < 5+int(data[3])<<8|int(data[4]) {
return nil
}
if err = c.tlsconn.Handshake(); err != nil || len(c.tlsconn.RawData()) == 0 {
if err != nil {
c.loop.loopError(c, err)
}
return nil
}
}
for err = c.tlsconn.ReadFrame(); err == nil; err = c.tlsconn.ReadFrame() { //循环读取直到获得
frame, err = c.codec.Decode(c)
if err != nil {
c.loop.loopError(c, err)
}
if frame != nil {
return frame
}
}
return nil
}
func (c *stdConn) read() []byte {
frame, err := c.codec.Decode(c)
if err != nil {
c.loop.ch <- func() error {
c.loop.loopError(c, err)
return nil
}
return nil
}
return frame
}
// ================================= Public APIs of gnet.Conn =================================
func (c *stdConn) Read() []byte {
return c.inboundBuffer.Bytes()
}
func (c *stdConn) ResetBuffer() {
c.inboundBuffer.Reset()
}
func (c *stdConn) ShiftN(n int) (size int) {
c.inboundBuffer.Shift(n)
return n
}
func (c *stdConn) ReadN(n int) (size int, buf []byte) {
buf = c.inboundBuffer.PreBytes(n)
size = len(buf)
return
}
func (c *stdConn) BufferLength() int {
return c.inboundBuffer.Len()
}
func (c *stdConn) OutBufferLength() int {
return 0
}
func (c *stdConn) AsyncWrite(buf []byte) error {
if encodedBuf, err := c.codec.Encode(c, buf); err == nil {
if len(encodedBuf) > 0 {
c.Write(encodedBuf)
}
} else {
c.loop.ch <- func() error {
c.loop.loopError(c, err)
return nil
}
}
return nil
}
// 用于直出不编码的出口,tls调用
func (c *stdConn) Write(buf []byte) (n int, err error) {
data := byteslice.Get(len(buf))
copy(data, buf)
c.loop.outChan <- out{c, data}
return len(buf), nil
}
func (c *stdConn) WriteNoCodec(buf []byte) error {
c.Write(buf)
return nil
}
func (c *stdConn) SendTo(buf []byte) (err error) {
_, err = c.loop.srv.ln.pconn.WriteTo(buf, c.remoteAddr)
return err
}
func (c *stdConn) Context() interface{} { return c.ctx }
func (c *stdConn) SetContext(ctx interface{}) { c.ctx = ctx }
func (c *stdConn) LocalAddr() net.Addr { return c.localAddr }
func (c *stdConn) RemoteAddr() net.Addr { return c.remoteAddr }
func (c *stdConn) Wake() error {
c.loop.ch <- wakeReq{c}
return nil
}
func (c *stdConn) Close() error {
c.loop.ch <- func() error {
c.state = connStateCloseReady
c.loop.loopClose(c)
return nil
}
return nil
}
func (c *stdConn) UpgradeTls(config *tls.Config) (err error) {
c.loop.ch <- func() error {
c.tlsconn, err = tls.Server(c, &c.inboundBuffer, &c.outboundBuffer, config.Clone())
c.inboundBufferWrite = c.tlsconn.RawWrite
c.readframe = c.tlsread
//很有可能握手包在UpgradeTls之前发过来了,这里把inboundBuffer剩余数据当做握手数据处理
if c.inboundBuffer != nil && c.inboundBuffer.Len() > 0 {
c.tlsconn.RawWrite(c.inboundBuffer.Bytes())
c.inboundBuffer.Reset()
if err := c.tlsconn.Handshake(); err != nil {
return err
}
}
return err
}
return err
}
func (c *stdConn) FlushWrite(data []byte, noCodec ...bool) {
atomic.AddInt64(&c.flushWaitNum, 1)
if len(noCodec) > 0 && noCodec[0] {
c.WriteNoCodec(data)
} else {
c.AsyncWrite(data)
}
out:
for c.state == connStateOk {
select {
case buflen := <-c.flushWait:
if buflen == 0 {
break out
}
case <-time.After(time.Millisecond * 10):
if c.state == connStateOk && (c.outboundBuffer == nil || c.outboundBuffer.Len() == 0) {
break out
}
}
}
atomic.AddInt64(&c.flushWaitNum, -1)
}
func (c *stdConn) SetWriteDeadline(i int64) {
c.conn.SetWriteDeadline(time.Unix(i, 0))
}