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wait.go
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wait.go
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// Copyright (c) 2015 Uber Technologies, Inc.
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package testutils
import (
"sync"
"time"
)
// WaitFor will retry f till it returns true for a maximum of timeout.
// It returns true if f returned true, false if timeout was hit.
func WaitFor(timeout time.Duration, f func() bool) bool {
timeoutEnd := time.Now().Add(Timeout(timeout))
const maxSleep = time.Millisecond * 50
sleepFor := time.Millisecond
for {
if f() {
return true
}
if time.Now().After(timeoutEnd) {
return false
}
time.Sleep(sleepFor)
if sleepFor < maxSleep {
sleepFor *= 2
}
}
}
// WaitWG waits for the given WaitGroup to be complete with a timeout
// and returns whether the WaitGroup completed within the timeout.
func WaitWG(wg *sync.WaitGroup, timeout time.Duration) bool {
wgC := make(chan struct{})
go func() {
wg.Wait()
wgC <- struct{}{}
}()
select {
case <-time.After(timeout):
return false
case <-wgC:
return true
}
}