Go语言错误重试技巧全解析

func retry(attempts int, sleep time.Duration, fn func() error) error {
    var err error
    for i := 0; i 

err := retry(3, 2*time.Second, func() error {
    // 模拟可能失败的操作
    return someUnstableOperation()
})
if err != nil {
    log.Fatal(err)
}

func retryWithBackoff(attempts int, baseDelay time.Duration, fn func() error) error {
    var err error
    for i := 0; i     if i < attempts-1 {
        delay := baseDelay * time.Duration(1<<i) // 指数增长
        time.Sleep(delay)
    }
}
return fmt.Errorf("failed after %d attempts: %v", attempts, err)

}

func retryWithJitter(attempts int, baseDelay time.Duration, fn func() error) error {
    rand.Seed(time.Now().UnixNano())
    var err error
<pre class="brush:php;toolbar:false;">for i := 0; i < attempts; i++ {
    err = fn()
    if err == nil {
        return nil
    }

    if i < attempts-1 {
        delay := baseDelay * time.Duration(1<<i)
        jitter := time.Duration(rand.Int63n(500)) * time.Millisecond
        time.Sleep(delay + jitter)
    }
}
return err

}

type RetryConfig struct {
    MaxAttempts  int
    BaseDelay    time.Duration
    MaxDelay     time.Duration
    Jitter       bool
}
<p>func DoWithRetry(cfg RetryConfig, fn func() error) error {
rand.Seed(time.Now().UnixNano())
var err error</p><pre class="brush:php;toolbar:false;">for i := 0; i < cfg.MaxAttempts; i++ {
    err = fn()
    if err == nil {
        return nil
    }

    if i == cfg.MaxAttempts-1 {
        break
    }

    delay := cfg.BaseDelay * time.Duration(1<<i)
    if delay > cfg.MaxDelay {
        delay = cfg.MaxDelay
    }

    if cfg.Jitter {
        jitter := time.Duration(rand.Int63n(int64(delay)))
        delay += jitter / 2
    }

    time.Sleep(delay)
}
return fmt.Errorf("operation failed after %d retries: %v", cfg.MaxAttempts, err)

}

err := DoWithRetry(RetryConfig{
    MaxAttempts: 5,
    BaseDelay:   500 * time.Millisecond,
    MaxDelay:    5 * time.Second,
    Jitter:      true,
}, func() error {
    return httpCall()
})