traefik/vendor/github.com/xenolf/lego/platform/wait/wait.go

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package wait
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import (
"fmt"
"time"
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"github.com/xenolf/lego/log"
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)
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// For polls the given function 'f', once every 'interval', up to 'timeout'.
func For(msg string, timeout, interval time.Duration, f func() (bool, error)) error {
log.Infof("Wait for %s [timeout: %s, interval: %s]", msg, timeout, interval)
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var lastErr string
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timeUp := time.After(timeout)
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for {
select {
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case <-timeUp:
return fmt.Errorf("time limit exceeded: last error: %s", lastErr)
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default:
}
stop, err := f()
if stop {
return nil
}
if err != nil {
lastErr = err.Error()
}
time.Sleep(interval)
}
}