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reroutine.go
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reroutine.go
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package reroutine
// Go starts the function do in a go-routine and restarts it only if it panics
// until the stop channel is closed. If the go-routine returns without panic,
// then it is not restarted. This function returns immediately.
func Go(stopChan <-chan struct{}, do func()) {
go BlockingGo(stopChan, do)
}
// BlockingGo is the same as Go but does not return until the provided function
// returns without panicking or the context is cancelled.
func BlockingGo(stopChan <-chan struct{}, do func()) {
start := make(chan struct{})
go func() {
start <- struct{}{}
}()
for {
select {
case <-stopChan:
return
case _, ok := <-start:
if !ok {
return
}
go func() {
defer HandleCrash(func(_ interface{}) {
start <- struct{}{}
})
do()
close(start)
}()
}
}
}
// Tomb is the minimum required interface to operate reroutine against a Tomb instance
type Tomb interface {
// Dying returns the channel that can be used to wait until the tomb is killed.
Dying() <-chan struct{}
// Go runs f in a new goroutine and tracks its termination.
Go(func() error)
}
// GoTomb is similar to Go except that it operates using a tomb.Tomb instance instead of
// a context.
func GoTomb(ts Tomb, do func() error) {
go BlockingGoTomb(ts, do)
}
// BlockingGoTomb is like GoTomb but does not return until the provided function
// returns without panicking or the context is cancelled.
func BlockingGoTomb(ts Tomb, do func() error) {
start := make(chan struct{})
go func() {
start <- struct{}{}
}()
for _ = range start {
select {
case <-ts.Dying():
return
default:
}
ts.Go(func() error {
defer HandleCrash(func(_ interface{}) {
start <- struct{}{}
})
err := do()
// Function completed without panic, don't restart
close(start)
return err
})
}
}