77 lines
2.1 KiB
Dart
77 lines
2.1 KiB
Dart
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import 'dart:math';
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/// 重试处理器，支持指数退避策略
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class RetryHandler {
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static const int maxRetries = 3;
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static const Duration initialDelay = Duration(seconds: 1);
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static const double exponentialBase = 2.0;
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/// 执行带重试的异步操作
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///
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/// [operation] 要执行的异步操作
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/// [retryIf] 可选的条件函数，返回true时才重试
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/// [maxAttempts] 最大尝试次数，默认为3次
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/// [onRetry] 可选的重试回调，参数为当前尝试次数和错误
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static Future<T> retry<T>({
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required Future<T> Function() operation,
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bool Function(dynamic error)? retryIf,
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int maxAttempts = maxRetries,
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void Function(int attempt, dynamic error)? onRetry,
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}) async {
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int attempt = 0;
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dynamic lastError;
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while (true) {
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try {
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attempt++;
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return await operation();
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} catch (e) {
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lastError = e;
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// 检查是否应该重试
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if (attempt >= maxAttempts || (retryIf != null && !retryIf(e))) {
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rethrow;
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}
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// 计算延迟时间（指数退避）
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final delay = initialDelay * pow(exponentialBase, attempt - 1);
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// 调用重试回调
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if (onRetry != null) {
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onRetry(attempt, e);
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}
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// 等待后重试
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await Future.delayed(delay);
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}
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}
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}
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/// 判断错误是否应该重试（网络相关错误）
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static bool shouldRetryOnError(dynamic error) {
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// 可以根据具体错误类型判断是否应该重试
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// 例如：网络超时、连接失败等应该重试
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// 认证失败、参数错误等不应该重试
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final errorStr = error.toString().toLowerCase();
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// 应该重试的错误类型
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if (errorStr.contains('timeout') ||
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errorStr.contains('connection') ||
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errorStr.contains('network') ||
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errorStr.contains('socket')) {
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return true;
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}
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// 不应该重试的错误类型
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if (errorStr.contains('authentication') ||
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errorStr.contains('unauthorized') ||
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errorStr.contains('forbidden') ||
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errorStr.contains('invalid')) {
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return false;
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}
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// 默认重试
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return true;
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}
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}
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