/
request_timer.go
78 lines (69 loc) · 1.9 KB
/
request_timer.go
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// Copyright 2021 Google LLC
//
// 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
//
// https://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
package wire
import (
"sync"
"time"
)
type requestTimerStatus int
const (
requestTimerNew requestTimerStatus = iota
requestTimerStopped
requestTimerTriggered
)
// requestTimer bounds the duration of a request and executes `onTimeout` if
// the timer is triggered.
type requestTimer struct {
onTimeout func()
timeoutErr error
timer *time.Timer
mu sync.Mutex
status requestTimerStatus
}
func newRequestTimer(duration time.Duration, onTimeout func(), timeoutErr error) *requestTimer {
rt := &requestTimer{
onTimeout: onTimeout,
timeoutErr: timeoutErr,
status: requestTimerNew,
}
rt.timer = time.AfterFunc(duration, rt.onTriggered)
return rt
}
func (rt *requestTimer) onTriggered() {
rt.mu.Lock()
defer rt.mu.Unlock()
if rt.status == requestTimerNew {
rt.status = requestTimerTriggered
rt.onTimeout()
}
}
// Stop should be called upon a successful request to prevent the timer from
// expiring.
func (rt *requestTimer) Stop() {
rt.mu.Lock()
defer rt.mu.Unlock()
if rt.status == requestTimerNew {
rt.status = requestTimerStopped
rt.timer.Stop()
}
}
// ResolveError returns `timeoutErr` if the timer triggered, or otherwise
// `originalErr`.
func (rt *requestTimer) ResolveError(originalErr error) error {
rt.mu.Lock()
defer rt.mu.Unlock()
if rt.status == requestTimerTriggered {
return rt.timeoutErr
}
return originalErr
}