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extended_waitgroup.go
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/
extended_waitgroup.go
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package sync
import (
"fmt"
"sync"
"time"
)
var (
TimeoutError = fmt.Errorf("group timed out")
)
type ExtendedWaitGroup struct {
group sync.WaitGroup
until time.Time
}
func (wg *ExtendedWaitGroup) Done() {
wg.group.Done()
}
func (wg *ExtendedWaitGroup) Add(delta int) {
wg.group.Add(delta)
}
func (wg *ExtendedWaitGroup) WaitWithTimeout(duration time.Duration) error {
timeout := make(chan bool, 1)
go func() {
time.Sleep(duration)
timeout <- true
}()
wait := make(chan bool, 1)
go func() {
wg.group.Wait()
wait <- true
}()
select {
case _ = <-timeout:
return TimeoutError
case _ = <-wait:
return nil
}
}
func (wg *ExtendedWaitGroup) WaitUntil(waitUntil time.Time) error {
wg.until = waitUntil
timeout := make(chan bool, 1)
go func() {
for {
time.Sleep(50 * time.Millisecond)
if time.Now().After(wg.until) {
timeout <- true
return
}
}
}()
wait := make(chan bool, 1)
go func() {
wg.group.Wait()
wait <- true
}()
select {
case _ = <-timeout:
return TimeoutError
case _ = <-wait:
return nil
}
}
func (wg *ExtendedWaitGroup) UpdateUntil(waitUntil time.Time) {
wg.until = waitUntil
}
func (wg *ExtendedWaitGroup) Wait() {
wg.group.Wait()
}