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io.model.poll.go
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io.model.poll.go
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// +build linux
package elio
import (
"fmt"
"io"
"sync"
"syscall"
"golang.org/x/sys/unix"
)
// ioPoll service implementation
type ioPoll struct {
io *Io
pollAccept *Poll
pollIo *Poll
}
// NewIoPoll new io poll
func NewIoPoll() *ioPoll {
io := new(ioPoll)
return io
}
func (m *ioPoll) String() string {
return fmt.Sprintf("ioPoll::%p", m)
}
func (m *ioPoll) GetIo() *Io {
return m.io
}
func (m *ioPoll) SetIo(io *Io) {
m.io = io
io.SetIoModel(m)
}
// Listen listen
func (m *ioPoll) Listen(addr string) bool {
m.GetIo().Host.Wg.Add(1)
defer func() {
m.GetIo().Host.Wg.Done()
}()
var err error
if err = m.GetIo().Listener.Listen("tcp", addr); nil == err {
//AppInfo().Str(LogObject, m.String()).Msgf("succeed to listen with url:%s", addr)
if 1 == m.GetIo().InCount.Add(1) {
m.GetIo().InAddr.Store(addr)
}
go m.loopAccept()
return true
}
AppError().Str(LogObject, m.String()).
Err(err).Msgf("listen service url:'%s' failed", addr)
return false
}
// Run run
func (m *ioPoll) Run() bool {
m.GetIo().Host.Wg.Add(1)
go m.loopIo()
return true
}
// Shut shut listen
func (m *ioPoll) Shut() {
addr := m.GetIo().InAddr.Load()
AppDebug().Str(LogObject, m.String()).
Msgf("shut service url:'%s' poll.accept:%s", addr, m.pollAccept.String())
if nil != m.GetIo().Listener.listener {
m.GetIo().Listener.Close()
}
m.pollAccept.End()
}
// End end
func (m *ioPoll) End() {
m.CloseAll()
m.Shut()
m.pollIo.End()
}
// Read read from session
func (m *ioPoll) Read(n *Session, in []byte) (receipt int, err error) {
for {
var r int
r, err = unix.Read(n.fd, in)
if 0 < r {
receipt += r
AppTrace().Str(LogObject, m.String()).Str(LogSession, n.String()).
Msgf("succeed to read with fd:%v in:%d/%d", n.fd, r, receipt)
_ = m.GetIo().Service.OnRead(n, n.buffer[:r])
}
if 0 == r || nil != err {
if nil == err {
err = io.EOF
}
if (unix.EAGAIN == err) || (unix.EWOULDBLOCK == err) {
//AppTrace().Str(LogObject, m.String()).Str(LogSession, n.String()).
// Err(err).Msgf("unable to read fd:%v in:%d", n.fd, r)
} else {
if io.EOF == err {
AppTrace().Str(LogObject, m.String()).Str(LogSession, n.String()).
Err(err).Msgf("closed to read with fd:%d receipt:%d", n.fd, r)
} else {
AppError().Str(LogObject, m.String()).Str(LogSession, n.String()).
Err(err).Msgf("failed to read with fd:%d failed receipt:%d", n.fd, r)
}
}
break
}
}
return receipt, err
}
// Write write
func (m *ioPoll) Write(n *Session, out []byte) (written int, err error) {
l := len(out)
written, err = n.sysWriteAll(out)
if nil != err {
if (unix.EAGAIN == err) || (unix.EWOULDBLOCK == err) {
//AppTrace().Str(LogObject, m.String()).Str(LogSession, n.String()).
// Err(err).Msgf("unable to write fd:%v out:%d/%d", n.fd, written, l)
} else {
AppError().Str(LogObject, m.String()).Str(LogSession, n.String()).
Err(err).Msgf("failed to write with fd:%v written:%d/%d", n.fd, written, l)
}
}
if 0 < written {
AppTrace().Str(LogObject, m.String()).Str(LogSession, n.String()).
Msgf("succeed to write with fd:%v out:%d/%d", n.fd, written, l)
m.GetIo().Service.OnWrite(n, out[:written])
}
if nil != err {
if (unix.EAGAIN != err) && (unix.EWOULDBLOCK != err) {
n.io.Service.OnError(n, err)
n.io.ioModel.Close(n)
}
}
return written, err
}
// PostWrite post write
func (m *ioPoll) PostWrite(n *Session, out []byte) (written int, err error) {
if nil != out {
n.IncRef()
b := GetByteBuffer()
b.Write(out[written:])
n.outQueue.Append(b)
}
if 0 < n.CountOutQueue() {
AppTrace().Str(LogObject, m.String()).Str(LogSession, n.String()).
Msgf("post.write trigger out:%d count.outqueue:%d", len(out), n.CountOutQueue())
err = m.pollIo.ControlMod(n.fd, unix.EPOLLET|unix.EPOLLONESHOT|unix.EPOLLIN|unix.EPOLLOUT)
if nil != err {
AppError().Str(LogObject, m.String()).Str(LogSession, n.String()).
Err(err).Msg("failed to write")
m.Close(n)
}
}
return written, err
}
func (m *ioPoll) Trigger(j interface{}) (err error) {
return m.pollIo.Trigger(j)
}
func (m *ioPoll) Close(n *Session) (err error) {
//_ = n.writeQueue.Fetch()
//AppDebug().Str(LogObject, m.String()).Str(LogSession, n.String()).Msgf("session.event close")
err = unix.Close(n.fd)
return err
}
func (m *ioPoll) Shutdown(n *Session, how int) error {
return unix.Shutdown(n.fd, how)
}
func (m *ioPoll) CloseAll() {
c := func(key string, v interface{}) {
s := v.(*Session)
m.Close(s)
}
m.GetIo().sessionCmap.IterCb(c)
}
const waitTimeoutMsec = -1 //10
const pollAcceptCount = 1 //4
// loopAccept loop
func (m *ioPoll) loopAccept() {
m.GetIo().Host.Wg.Add(1)
addr := m.GetIo().InAddr.Load()
AppInfo().Str(LogObject, m.String()).
Msgf("succeed to listen with url:%s", addr)
// if zerolog.InfoLevel < zerolog.GlobalLevel() {
// AppDebug().Str(LogObject, m.String()).
// Msgf("succeed to listen with url:'%s'", addr.String())
// }
var err error
defer func() {
if nil != m.pollAccept {
m.pollAccept.End()
m.pollAccept = nil
}
m.GetIo().Host.Wg.Done()
}()
if m.pollAccept = NewPoll(); nil == m.pollAccept {
AppError().Str(LogObject, m.String()).
Msgf("failed to create poll.accept:%s", m.pollAccept.String())
return
}
AppDebug().Str(LogObject, m.String()).
Msgf("create poll.accept:%s", m.pollAccept.String())
if err = m.pollAccept.Begin(); nil == err {
// accepting is no need to be oneshot
if err = m.pollAccept.ControlAdd(m.GetIo().Listener.ToFd(), unix.EPOLLIN|unix.EPOLLEXCLUSIVE); nil != err {
AppError().Str(LogObject, m.String()).Err(err).
Msgf("failed to ready listen with poll.accept:%s", m.pollAccept.String())
}
//AppDebug().Str(LogObject, m.String()).
// Msgf("succeed to ready with poll.accept:%s listen.fd:%d",
// m.pollAccept.String(), m.GetIo().Listener.ToFd())
if err = unix.SetNonblock(m.GetIo().Listener.ToFd(), true); nil != err {
AppError().Str(LogObject, m.String()).Err(err).
Msgf("failed to set.nonblock poll.accept:%s", m.pollAccept.String())
}
} else {
AppError().Str(LogObject, m.String()).
Msgf("failed to begin poll:%s", m.pollAccept.String())
return
}
//m.GetIo().Service.OnListen(m.GetIo())
AppInfo().Str(LogObject, m.String()).
Msgf("poll.accept.wait with %d events", m.GetIo().Config.InWaitCount)
var wg sync.WaitGroup
wg.Add(pollAcceptCount)
for i := 0; i < pollAcceptCount; i++ {
go func(w *sync.WaitGroup) {
defer w.Done()
var events []unix.EpollEvent
events = make([]unix.EpollEvent, m.GetIo().Config.InWaitCount)
for {
var waits int
if waits, err = m.pollAccept.Wait(events, waitTimeoutMsec); nil != err {
AppError().Str(LogObject, m.String()).Err(err).
Msgf("poll.accept:%s failed to wait", m.pollAccept.String())
break
}
failed := 0
for i := 0; i < waits; i++ {
//AppDebug().Str(LogObject, m.String()).
// Msgf("poll:%s wait event:%v with fd:%d", m.poll.String(), events[i].Events, events[i].Fd)
fd := int(events[i].Fd)
if unix.EPOLLIN == events[i].Events&unix.EPOLLIN {
if false == m.handleAccept(fd) {
failed++
}
}
}
if 0 < failed {
break
}
}
}(&wg)
}
wg.Wait()
AppInfo().Str(LogObject, m.String()).
Msgf("service:%s poll:%s on.shut", m.String(), m.pollAccept.String())
//m.GetIo().Service.OnShut(m.GetIo())
AppInfo().Str(LogObject, m.String()).Msgf("service:%s close poll.accpet", m.String())
}
const pollIoCount = 1
// loopIo loop io
func (m *ioPoll) loopIo() {
//addr := m.GetIo().InAddr.Load().(*net.TCPAddr)
// AppInfo().Str(LogObject, m.String()).
// Msgf("succeed to listen with url:'%s'", addr.String())
// if zerolog.InfoLevel < zerolog.GlobalLevel() {
// AppInfo().Str(LogObject, m.String()).
// Msgf("succeed to listen with url:'%s'", addr.String())
// }
var err error
defer func() {
if nil != m.pollIo {
m.CloseAll()
m.pollIo.End()
m.pollIo = nil
}
}()
// Start epoll io
if m.pollIo = NewPoll(); nil == m.pollIo {
AppError().Str(LogObject, m.String()).Msg("failed to create poll")
return
}
AppDebug().Str(LogObject, m.String()).
Msgf("create poll.io:%s", m.pollIo.String())
if err = m.pollIo.Begin(); nil == err {
} else {
AppError().Str(LogObject, m.String()).
Msgf("failed to begin poll:%s", m.pollIo.String())
return
}
AppInfo().Str(LogObject, m.String()).
Msgf("poll.io.wait with %d events", m.GetIo().Config.InWaitCount)
var events []unix.EpollEvent
events = make([]unix.EpollEvent, m.GetIo().Config.InWaitCount)
var wg sync.WaitGroup
wg.Add(pollIoCount)
for i := 0; i < pollIoCount; i++ {
go func(w *sync.WaitGroup) {
defer w.Done()
for {
var waits int
if waits, err = m.pollIo.Wait(events, waitTimeoutMsec); nil != err {
AppError().Str(LogObject, m.String()).Err(err).
Msgf("poll.io:%s failed to wait", m.pollIo.String())
break
}
for i := 0; i < waits; i++ {
//AppDebug().Str(LogObject, m.String()).
//Msgf("poll:%s wait event:%v with fd:%d", m.poll.String(), events[i].Events, events[i].Fd)
fd := int(events[i].Fd)
if fd == m.pollIo.wfd {
AppDebug().Str(LogObject, m.String()).
Msgf("poll:%s wake up event:%v with fd:%d", m.pollIo.String(), events[i].Events, events[i].Fd)
_, _ = unix.Read(m.pollIo.wfd, m.pollIo.wfdBuf)
} else {
var n *Session
if result, ok := m.GetIo().sessionCmap.Get(fmt.Sprintf("0x%08x", fd)); true == ok {
n = result.(*Session)
} else {
AppError().Str(LogObject, m.String()).
Msgf("failed to get session by fd:%d", fd)
continue
}
if unix.EPOLLOUT == events[i].Events&unix.EPOLLOUT {
AppTrace().Str(LogObject, m.String()).
Msgf("poll:%s awake fd:%d with events.epollout:%X", m.pollIo.String(), events[i].Fd, events[i].Events)
m.handleWrite(n)
}
if unix.EPOLLIN == events[i].Events&unix.EPOLLIN {
AppTrace().Str(LogObject, m.String()).
Msgf("poll:%s awake fd:%d with events.epollin:%X", m.pollIo.String(), events[i].Fd, events[i].Events)
m.handleRead(n)
}
//if unix.EPOLLERR == events[i].Events&unix.EPOLLERR {
// m.handleError(n)
//}
}
}
}
}(&wg)
}
wg.Wait()
AppInfo().Str(LogObject, m.String()).Msgf("service:%s close poll.io", m.String())
}
// canRepost can repost?
func canRepost(err error) bool {
if (nil == err) || (unix.EAGAIN == err) || (unix.EWOULDBLOCK == err) {
return true
}
return false
}
func (m *ioPoll) handleAccept(fd int) bool {
err := m.accept(fd)
if true == canRepost(err) {
//AppDebug().Str(LogObject, m.String()).Str(LogSession, n.String()).Err(err).
//Msgf("session.event control.mod receipt:%d", receipt)
// control mod is not necessary for epoll exclusive flags
//if err = m.pollAccept.ControlMod(fd, unix.EPOLLET|unix.EPOLLONESHOT|unix.EPOLLIN); nil != err {
// AppError().Str(LogObject, m.String()).
// Msgf("failed to poll.mod with listen.fd:%d error:'%v'", fd, err)
// return false
//}
} else {
AppError().Str(LogObject, m.String()).
Msgf("failed to accept by listen.fd:%d with error:'%v'", fd, err)
}
return true
}
func (m *ioPoll) handleRead(n *Session) {
_, err := m.Read(n, n.buffer)
if true == canRepost(err) {
//AppDebug().Str(LogObject, m.String()).Str(LogSession, n.String()).
// Err(err).Msgf("handle.read canRepost count.outqueue:%d", co)
if 0 == n.CountOutQueue() {
if err = m.pollIo.ControlMod(n.fd, unix.EPOLLET|unix.EPOLLONESHOT|unix.EPOLLIN); nil != err {
AppError().Str(LogObject, m.String()).Str(LogSession, n.String()).
Err(err).Msgf("failed to poll.mod.r to fd:%d", n.fd)
}
} else {
if err = m.pollIo.ControlMod(n.fd, unix.EPOLLET|unix.EPOLLONESHOT|unix.EPOLLIN|unix.EPOLLOUT); nil != err {
AppError().Str(LogObject, m.String()).Str(LogSession, n.String()).
Err(err).Msgf("failed to poll.mod.rw to fd:%d", n.fd)
}
}
} else {
AppTrace().Str(LogObject, m.String()).Str(LogSession, n.String()).Err(err).
Msgf("handle.read release session")
// if io.EOF == err {
// AppDebug().Str(LogObject, m.String()).Str(LogSession, n.String()).
// Err(err).Msgf("succeed to close with fd:%d", n.fd)
// } else {
// AppError().Str(LogObject, m.String()).Str(LogSession, n.String()).
// Err(err).Msgf("failed to read with fd:%d", n.fd)
// }
m.releaseSession(n, err)
}
}
func (m *ioPoll) handleWrite(n *Session) {
co := n.CountOutQueue()
if 0 < co {
AppTrace().Str(LogObject, m.String()).Str(LogSession, n.String()).
Msgf("handle.write awake with fd:%d count.outqueue:%d", n.fd, co)
written, err := m.write(n)
if true == canRepost(err) {
if nil != err {
AppDebug().Str(LogObject, m.String()).Str(LogSession, n.String()).
Err(err).Msgf("handle.write can repost though error with written:%d count.outqueue:%d", written, n.CountOutQueue())
}
if 0 == n.CountOutQueue() {
if err = m.pollIo.ControlMod(n.fd, unix.EPOLLET|unix.EPOLLONESHOT|unix.EPOLLIN); nil != err {
AppError().Str(LogObject, m.String()).Str(LogSession, n.String()).
Err(err).Msgf("failed to poll.mod.r to fd:%d", n.fd)
}
} else {
if err = m.pollIo.ControlMod(n.fd, unix.EPOLLET|unix.EPOLLONESHOT|unix.EPOLLIN|unix.EPOLLOUT); nil != err {
AppError().Str(LogObject, m.String()).Str(LogSession, n.String()).
Err(err).Msgf("failed to poll.mod.rw to fd:%d", n.fd)
}
}
} else {
AppError().Str(LogObject, m.String()).Str(LogSession, n.String()).
Err(err).Msgf("failed to write with fd:%d written:%d", n.fd, written)
//m.releaseSession(n, err)
}
}
}
// func (m *ioPoll) handleError(n *Session) {
// //n, e := getsockoptIntFunc(fd, unix.SOL_SOCKET, unix.SO_ERROR)
// //if e != nil {
// // err = os.NewSyscallError("getsockopt", e)
// //}
// t := fmt.Sprintf("run.error fd:%d with EPOLLERR", n.fd)
// AppDebug().Str(LogObject, m.String()).
// Str(LogSession, n.String()).Msg(t)
// err := errors.New(t)
// m.releaseSession(n, err)
// }
// func (m *ioPoll) handleHup(n *Session) {
// //eno, enoOk := err.(syscall.Errno)
// //t := fmt.Sprintf("run.hup fd:%d with EPOLLHUP errno:%v, ok:%v", fd, eno, enoOk)
// err := fmt.Errorf("handle.hup EPOLLHUP with fd:%d", n.fd)
// AppError().Str(LogObject, m.String()).Str(LogSession, n.String()).
// Err(err).Msgf("handle.hup fd:%d", n.fd)
// m.releaseSession(n, err)
// }
// func (m *ioPoll) handleRdHup(n *Session) {
// err := fmt.Errorf("handle.rdhup EPOLLRDHUP with fd:%d", n.fd)
// AppError().Str(LogObject, m.String()).Str(LogSession, n.String()).Str(LogSession, n.String()).
// Err(err).Msgf("handle.rdhup fd:%d", n.fd)
// m.releaseSession(n, err)
// }
func (m *ioPoll) releaseSession(n *Session, err error) {
if io.EOF != err {
m.GetIo().Service.OnError(n, err)
}
m.GetIo().Service.OnClose(n, err)
m.pollIo.ControlDel(n.fd, 0)
m.Close(n)
m.GetIo().sessionCmap.Remove(fmt.Sprintf("0x%08x", n.fd))
n.DecRef()
}
// accept accept socket
func (m *ioPoll) accept(fd int) (err error) {
for {
var nfd int
var sa unix.Sockaddr // remote socket address
nfd, sa, err = unix.Accept(fd)
if nil != err {
if (unix.EAGAIN == err) || (unix.EWOULDBLOCK == err) {
//AppDebug().Str(LogObject, m.String()).
// Msgf("accepting would block with fd:%d error(EAGAIN):%v", fd, err)
break
}
AppError().Str(LogObject, m.String()).
Err(err).Msgf("accept to fd:%d failed", fd)
break
}
//if false == m.GetIo().sessionCmap.Has(fmt.Sprintf("0x%08x", nfd)) {
if err := unix.SetNonblock(nfd, true); nil != err {
AppError().Str(LogObject, m.String()).
Err(err).Msgf("accept set.nonblock to fd:%d failed", nfd)
break
}
if true == m.GetIo().Config.InNoDelay {
// This should disable Nagle's algorithm in all accepted sockets by default.
// Users may enable it with net.TCPConn.SetNoDelay(false).
if err = unix.SetsockoptInt(nfd, syscall.IPPROTO_TCP, syscall.TCP_NODELAY, 1); err != nil {
AppError().Str(LogObject, m.String()).
Err(err).Msgf("accept set.nodelay to fd:%d failed", nfd)
break
} else {
//AppDebug().Str(LogObject, m.String()).
// Msgf("succeed to accepting set.nodelay with fd:%d true'", nfd)
}
}
if 0 != m.GetIo().Config.InRcvBuff {
if err = unix.SetsockoptInt(nfd, syscall.SOL_SOCKET, syscall.SO_RCVBUF, m.GetIo().Config.InRcvBuff*1024); err != nil {
AppError().Str(LogObject, m.String()).
Err(err).Msgf("accept set.rcvbuf:%d(KB) to fd:%d failed", m.GetIo().Config.InRcvBuff, nfd)
break
} else {
//AppDebug().Str(LogObject, m.String()).
// Msgf("succeed to accepting set.nodelay with fd:%d true'", nfd)
}
}
if 0 != m.GetIo().Config.InSndBuff {
if err = unix.SetsockoptInt(nfd, syscall.SOL_SOCKET, syscall.SO_SNDBUF, m.GetIo().Config.InSndBuff*1024); err != nil {
AppError().Str(LogObject, m.String()).
Err(err).Msgf("accept set.sndbuf:%d(KB) to fd:%d failed", m.GetIo().Config.InSndBuff, nfd)
break
} else {
//AppDebug().Str(LogObject, m.String()).
// Msgf("succeed to accepting set.nodelay with fd:%d true'", nfd)
}
}
/*//
if 0 < m.GetIo().Config.InRecvTimeo {
tv := unix.NsecToTimeval(int64(m.GetIo().Config.InRecvTimeo) * int64(time.Millisecond))
if err = unix.SetsockoptTimeval(nfd, syscall.SOL_SOCKET, syscall.SO_RCVTIMEO, &tv); err != nil {
AppDebug().Str(LogObject, m.String()).
Err(err).Msgf("accept set.recvtimeout to fd:%d failed", nfd)
break
} else {
AppDebug().Str(LogObject, m.String()).
Msgf("succeed to accepting set.recvtimeout with fd:%d tv:%v", nfd, tv.Sec)
}
}
//*/
n := NewSession(nfd, nil, m.GetIo())
m.GetIo().Service.OnOpen(n)
m.GetIo().sessionCmap.Set(fmt.Sprintf("0x%08x", n.fd), n)
n.sa = sa
if err = m.pollIo.ControlAdd(n.fd, unix.EPOLLET|unix.EPOLLONESHOT|unix.EPOLLIN); nil != err {
AppError().Str(LogObject, m.String()).Str(LogSession, n.String()).
Err(err).Msgf("failed to accepting poll.add.r with fd:%d", n.fd)
} else {
//AppDebug().Str(LogObject, m.String()).Str(LogSession, n.String()).
// Msgf("fd:%d succeed to accept by listen.fd:%d", nfd, fd)
}
//} else {
// // skip accepting already logged in session
// AppWarn().Str(LogObject, m.String()).
// Msgf("skip to accepting fd:%d with already accepted", nfd)
//}
}
return err
}
// // read read
// func (m *ioPoll) read(n *Session) (err error) {
// for {
// var r int
// r, err = m.Read(n, n.buffer)
// if 0 < r {
// if nil != m.GetIo().Config.Events.OnRead {
// AppTrace().Str(LogObject, m.String()).Str(LogSession, n.String()).
// Msgf("succeed to read with fd:%v in:%d", n.fd, r)
// _ = m.GetIo().Config.Events.OnRead(n, n.buffer[:r])
// }
// }
// if 0 == r || nil != err {
// if nil == err {
// err = io.EOF
// }
// if (unix.EAGAIN == err) || (unix.EWOULDBLOCK == err) {
// AppTrace().Str(LogObject, m.String()).Str(LogSession, n.String()).
// Err(err).Msgf("unable to read fd:%v in:%d", n.fd, r)
// } else {
// if io.EOF == err {
// AppTrace().Str(LogObject, m.String()).Str(LogSession, n.String()).
// Err(err).Msgf("closed to read with fd:%d in:%d", n.fd, r)
// } else {
// AppError().Str(LogObject, m.String()).Str(LogSession, n.String()).
// Err(err).Msgf("failed to read with fd:%d failed in:%d", n.fd, r)
// }
// }
// break
// }
// }
// return err
// }
// write write
func (m *ioPoll) write(n *Session) (written int, err error) {
var out []byte
outs := n.outQueue.Fetch()
var ref int32
ref = int32(len(outs))
if 0 < ref {
for _, o := range outs {
out = append(out, o.(*ByteBuffer).Bytes()...)
PutByteBuffer(o.(*ByteBuffer))
}
l := len(out)
written, err = m.Write(n, out)
if written < l {
b := GetByteBuffer()
b.Write(out[written:])
n.outQueue.Prepend(b)
n.SubRef(ref - 1)
} else {
n.SubRef(ref)
}
} else {
AppDebug().Str(LogObject, m.String()).Str(LogSession, n.String()).
Msgf("no writable out with fd:%d", n.fd)
}
return written, err
}