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GeezerVison is showing github.com — netpoll/net_polldesc.go at main · stop-coding/netpoll

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net_polldesc.go

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// Copyright 2021 CloudWeGo Authors
//
// 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 netpoll
import (
"errors"
"time"
)
// TODO: recycle *pollDesc
func newPollDesc(fd int) *pollDesc {
pd, op := &pollDesc{}, &FDOperator{}
pd.writeTicker = make(chan error, 1)
op.FD = fd
op.OnWrite = func(p Poll) error {
select {
case pd.writeTicker <- nil:
default:
}
return nil
}
op.OnHup = func(p Poll) error {
select {
case pd.writeTicker <- Exception(ErrConnClosed, "by peer"):
default:
}
return nil
}
pd.operator = op
return pd
}
type pollDesc struct {
operator *FDOperator
// The write event is OneShot, then mark the writable to skip duplicate calling.
writable bool
writeTicker chan error
}
// WaitWrite
// TODO: implement - poll support timeout hung up.
func (pd *pollDesc) WaitWrite(deadline time.Time) (err error) {
// if writable, check hup by select
if pd.writable {
select {
case err = <-pd.writeTicker:
return err
default:
return nil
}
}
// calling first time
if deadline.IsZero() {
return Exception(ErrDialNoDeadline, "")
}
dur := time.Until(deadline)
if dur <= 0 {
return Exception(ErrDialTimeout, dur.String())
}
// add ET|Write|Hup
pd.operator.poll = pollmanager.Pick()
err = pd.operator.Control(PollWritable)
if err != nil {
pd.operator.Control(PollDetach)
return err
}
// add timeout trigger
cancel := time.AfterFunc(dur, func() {
select {
case pd.writeTicker <- Exception(ErrDialTimeout, dur.String()):
default:
}
})
// wait
if err = <-pd.writeTicker; err == nil {
pd.writable = true
} else {
if errors.Is(err, ErrDialTimeout) {
pd.operator.Control(PollDetach)
}
}
cancel.Stop()
return err
}
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