func retry(attempts int, sleep time.Duration, fn func() error) error {
    var err error
    for i := 0; i < attempts; i++ {
        err = fn()
        if err == nil {
            return nil
        }
        // 判断是否可重试的错误（如网络超时）
        if !isRetryable(err) {
            return err
        }
        time.Sleep(sleep)
        sleep *= 2 // 可选：指数退避
    }
    return fmt.Errorf("after %d attempts, last error: %s", attempts, err)
}

baseDelay := 100 * time.Millisecond
maxDelay := 1 * time.Second
<p>for i := 0; i < maxRetries; i++ {
err := callService()
if err == nil {
break
}
if !isTransient(err) {
return err
}</p><pre class="brush:php;toolbar:false;">delay := baseDelay * time.Duration(1<<uint(i)) // 指数增长
jitter := time.Duration(rand.Int63n(int64(delay)))
delay = delay/2 + jitter%delay // 添加随机性

time.Sleep(delay)

}

operation := func() error {
    resp, err := http.Get("http://service/api")
    if err != nil {
        return err
    }
    defer resp.Body.Close()
    if resp.StatusCode != http.StatusOK {
        return fmt.Errorf("bad status: %s", resp.Status)
    }
    return nil
}
<p>err := backoff.Retry(operation, backoff.WithMaxRetries(backoff.NewExponentialBackOff(), 5))
if err != nil {
log.Fatal("Failed after retries:", err)
}