lego/platform/wait/wait.go
2021-05-14 17:37:45 +02:00

37 lines
688 B
Go

package wait
import (
"errors"
"fmt"
"time"
"github.com/go-acme/lego/v4/log"
)
// 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)
var lastErr error
timeUp := time.After(timeout)
for {
select {
case <-timeUp:
if lastErr == nil {
return errors.New("time limit exceeded")
}
return fmt.Errorf("time limit exceeded: last error: %w", lastErr)
default:
}
stop, err := f()
if stop {
return nil
}
if err != nil {
lastErr = err
}
time.Sleep(interval)
}
}