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io_handle_async.go
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/
io_handle_async.go
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package goev
import (
"syscall"
"time"
)
// AsyncWriteBuf x
type AsyncWriteBuf struct {
Flag int // The flag will be returned in OnAsyncWriteBufDone,
// allowing you to know the actual processing progress.
Writen int // wrote len
Len int // buf original len. readonly
Buf []byte // readonly
}
// AsyncWrite asynchronous write
func (h *IOHandle) AsyncWrite(eh EvHandler, abf AsyncWriteBuf) {
if h._fd > 0 { // NOTE fd must > 0
h._ep.push(asyncWriteItem{
fd: h._fd,
eh: eh,
abf: abf,
})
} else {
eh.OnAsyncWriteBufDone(abf.Buf, abf.Flag)
}
}
func (h *IOHandle) asyncOrderedWrite(eh EvHandler, abf AsyncWriteBuf) {
if h._fd < 1 { // closed or except
eh.OnAsyncWriteBufDone(abf.Buf, abf.Flag)
return
}
if h._asyncWriteBufQ != nil && !h._asyncWriteBufQ.IsEmpty() {
h._asyncWriteBufQ.Push(abf)
return
}
if abf.Len < 1 || abf.Writen >= abf.Len {
eh.OnAsyncWriteBufDone(abf.Buf, abf.Flag)
return
}
n, _ := syscall.Write(h._fd, abf.Buf[abf.Writen:abf.Len])
if n > 0 {
if n == (abf.Len - abf.Writen) {
h._asyncLastPartialWriteTime = 0
eh.OnAsyncWriteBufDone(abf.Buf, abf.Flag) // send completely
return
}
abf.Writen += n // Partially write, shift n
}
h._asyncLastPartialWriteTime = time.Now().UnixMilli()
// Error or Partially
if h._asyncWriteBufQ == nil {
h._asyncWriteBufQ = NewRingBuffer[AsyncWriteBuf](2)
}
h._asyncWriteBufQ.Push(abf)
if h._asyncWriteWaiting == false {
h._asyncWriteWaiting = true
h._ep.append(h._fd, EvOut) // No need to use ET mode
// eh needs to implement the OnWrite method, and the OnWrite method needs to call AsyncOrderedFlush.
}
}
// AsyncOrderedFlush only called in OnWrite
//
// For example:
//
// func (x *XX) OnWrite(fd int) {
// x.AsyncOrderedFlush(x)
// }
func (h *IOHandle) AsyncOrderedFlush(eh EvHandler) {
if h._asyncWriteBufQ == nil || h._asyncWriteBufQ.IsEmpty() {
return
}
if h._fd < 1 {
return
}
n := h._asyncWriteBufQ.Len()
// It is necessary to use n to limit the number of sending attempts.
// If there is a possibility of sending failure, the data should be saved again in _asyncWriteBufQ
for i := 0; i < n; i++ {
abf, ok := h._asyncWriteBufQ.Pop()
if !ok {
break
}
eh.asyncOrderedWrite(eh, abf)
}
if h._asyncWriteBufQ.IsEmpty() {
h._ep.subtract(h._fd, EvOut)
h._asyncWriteWaiting = false
}
}
// OnAsyncWriteBufDone callback after bf used (within the evpoll coroutine),
func (h *IOHandle) OnAsyncWriteBufDone(bf []byte, flag int) {
}
// AsyncWaitWriteQLen The length of the queue waiting to be sent asynchronously
//
// If it is too long, it indicates that the sending is slow and the receiving end is abnormal
func (h *IOHandle) AsyncWaitWriteQLen() int {
if h._asyncWriteBufQ == nil {
return 0
}
return h._asyncWriteBufQ.Len()
}
// AsyncLastPartialWriteTime indicates that the previous write was incomplete and requires 'evpoll'
// to polling for the writable state. This value helps prevent a connection from being indefinitely
// unreachable due to abnormalities or the recipient not receiving data. Millisecond
//
// e.g.
// if nowMilli - x.AsyncLastPartialWriteTime() > 10*1000 && x.AsyncWaitWriteQLen() > 0 { // 10secs
//
// x.GetReactor().RemoveEvHandler(x, x.Fd())
// x.OnClose(x.Fd())
// return // The connection lifecycle has ended
// }
func (h *IOHandle) AsyncLastPartialWriteTime() int64 {
return h._asyncLastPartialWriteTime
}