// wait implements Wait, taking exponentialBackoff and sleeper arguments for testing.
func (op *Operation) wait(ctx context.Context, resp proto.Message, bo *gax.Backoff, sl sleeper) error {
for {
if err := op.Poll(ctx, resp); err != nil {
return err
}
if op.Done() {
return nil
}
if err := sl(ctx, bo.Pause()); err != nil {
return err
}
}
}
func retry(ctx context.Context, bo gax.Backoff, f func() (stop bool, err error),
sleep func(context.Context, time.Duration) error) error {
var lastErr error
for {
stop, err := f()
if stop {
return err
}
// Remember the last "real" error from f.
if err != nil && err != context.Canceled && err != context.DeadlineExceeded {
lastErr = err
}
p := bo.Pause()
if cerr := sleep(ctx, p); cerr != nil {
if lastErr != nil {
return fmt.Errorf("%v; last function err: %v", cerr, lastErr)
}
return cerr
}
}
}