55 lines
1.6 KiB
Go
55 lines
1.6 KiB
Go
package retryhelper
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import (
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"fmt"
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"math"
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"time"
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)
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// RetryOptions 定义重试的配置项
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type RetryOptions struct {
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MaxRetries int // 最大重试次数
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InitialInterval time.Duration // 初始重试间隔
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MaxInterval time.Duration // 最大重试间隔
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BackoffFactor float64 // 指数退避的增长因子
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RetryableErrFn func(error) bool // 用于判断是否为可重试错误的函数（可选）
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}
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func DefaultRetryOptions() RetryOptions {
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return RetryOptions{
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MaxRetries: 3,
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InitialInterval: 150 * time.Millisecond,
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MaxInterval: 3 * time.Second,
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BackoffFactor: 2.0,
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}
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}
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// Retry 重试通用函数（用于没有返回值的函数）
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func Retry(op func() error, opts RetryOptions) error {
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_, err := RetryWithResult(func() (struct{}, error) {
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return struct{}{}, op()
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}, opts)
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return err
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}
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// RetryWithResult 重试通用函数（用于带返回值的函数）
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func RetryWithResult[T any](op func() (T, error), opts RetryOptions) (result T, err error) {
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interval := opts.InitialInterval
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for attempt := 0; attempt <= opts.MaxRetries; attempt++ {
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result, err = op()
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if err == nil {
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return result, nil
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}
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if opts.RetryableErrFn != nil && !opts.RetryableErrFn(err) {
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return result, err
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}
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if attempt < opts.MaxRetries {
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time.Sleep(interval)
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interval = time.Duration(math.Min(float64(opts.MaxInterval), float64(interval)*opts.BackoffFactor))
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}
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}
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return result, fmt.Errorf("retry failed after %d attempts, last error: %w", opts.MaxRetries+1, err)
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}
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