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package acme
import (
"fmt"
"time"
)
// WaitFor polls the given function 'f', once every 'interval', up to 'timeout'.
func WaitFor(timeout, interval time.Duration, f func() (bool, error)) error {
var lastErr string
timeup := time.After(timeout)
for {
select {
case <-timeup:
return fmt.Errorf("Time limit exceeded. Last error: %s", lastErr)
default:
}
stop, err := f()
if stop {
return nil
}
if err != nil {
lastErr = err.Error()
}
time.Sleep(interval)
}
}
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