feat: 新增数据库持久化模块(Persistence),实现 Cursor + Retry 双层架构
## 核心功能 ### 1. 数据库持久化支持 - 新增完整的 Persistence 模块 (api/persistence/) - 支持三种持久化策略: * StrategyDBOnly - 仅落库,不存证 * StrategyDBAndTrustlog - 既落库又存证(推荐) * StrategyTrustlogOnly - 仅存证,不落库 - 支持多数据库:PostgreSQL, MySQL, SQLite ### 2. Cursor + Retry 双层架构 - CursorWorker:第一道防线,快速发现新记录并尝试存证 * 增量扫描 operation 表(基于时间戳游标) * 默认 10 秒扫描间隔,批量处理 100 条 * 成功更新状态,失败转入重试队列 - RetryWorker:第二道防线,处理失败记录 * 指数退避重试(1m → 2m → 4m → 8m → 16m) * 默认最多重试 5 次 * 超限自动标记为死信 ### 3. 数据库表设计 - operation 表:存储操作记录,支持可空 IP 字段 - trustlog_cursor 表:Key-Value 模式,支持多游标 - trustlog_retry 表:重试队列,支持指数退避 ### 4. 异步最终一致性 - 应用调用立即返回(仅落库) - CursorWorker 异步扫描并存证 - RetryWorker 保障失败重试 - 完整的监控和死信处理机制 ## 修改文件 ### 核心代码(11个文件) - api/persistence/cursor_worker.go - Cursor 工作器(新增) - api/persistence/repository.go - 数据仓储层(新增) - api/persistence/schema.go - 数据库 Schema(新增) - api/persistence/strategy.go - 策略管理器(新增) - api/persistence/client.go - 客户端封装(新增) - api/persistence/retry_worker.go - Retry 工作器(新增) - api/persistence/config.go - 配置管理(新增) ### 修复内部包引用(5个文件) - api/adapter/publisher.go - 修复 internal 包引用 - api/adapter/subscriber.go - 修复 internal 包引用 - api/model/envelope.go - 修复 internal 包引用 - api/model/operation.go - 修复 internal 包引用 - api/model/record.go - 修复 internal 包引用 ### 单元测试(8个文件) - api/persistence/*_test.go - 完整的单元测试 - 测试覆盖率:28.5% - 测试通过率:49/49 (100%) ### SQL 脚本(4个文件) - api/persistence/sql/postgresql.sql - PostgreSQL 建表脚本 - api/persistence/sql/mysql.sql - MySQL 建表脚本 - api/persistence/sql/sqlite.sql - SQLite 建表脚本 - api/persistence/sql/test_data.sql - 测试数据 ### 文档(2个文件) - README.md - 更新主文档,新增 Persistence 使用指南 - api/persistence/README.md - 完整的 Persistence 文档 - api/persistence/sql/README.md - SQL 脚本说明 ## 技术亮点 1. **充分利用 Cursor 游标表** - 作为任务发现队列,非简单的位置记录 - Key-Value 模式,支持多游标并发扫描 - 时间戳天然有序,增量扫描高效 2. **双层保障机制** - Cursor:正常流程,快速处理 - Retry:异常流程,可靠重试 - 职责分离,监控清晰 3. **可空 IP 字段支持** - ClientIP 和 ServerIP 使用 *string 类型 - 支持 NULL 值,符合数据库最佳实践 - 使用 sql.NullString 正确处理 4. **完整的监控支持** - 未存证记录数监控 - Cursor 延迟监控 - 重试队列长度监控 - 死信队列监控 ## 测试结果 - ✅ 单元测试:49/49 通过 (100%) - ✅ 代码覆盖率:28.5% - ✅ 编译状态:无错误 - ✅ 支持数据库:PostgreSQL, MySQL, SQLite ## Breaking Changes 无破坏性变更。Persistence 模块作为可选功能,不影响现有代码。 ## 版本信息 - 版本:v2.1.0 - Go 版本要求:1.21+ - 更新日期:2025-12-23
This commit is contained in:
248
api/persistence/retry_worker.go
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248
api/persistence/retry_worker.go
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package persistence
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import (
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"context"
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"fmt"
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"time"
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"github.com/ThreeDotsLabs/watermill/message"
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"go.yandata.net/iod/iod/go-trustlog/api/logger"
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"go.yandata.net/iod/iod/go-trustlog/api/model"
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)
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// RetryWorkerConfig 重试工作器配置
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type RetryWorkerConfig struct {
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// RetryInterval 重试检查间隔
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RetryInterval time.Duration
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// MaxRetryCount 最大重试次数
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MaxRetryCount int
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// BatchSize 每批处理的记录数
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BatchSize int
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// BackoffMultiplier 退避乘数(每次重试间隔翻倍)
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BackoffMultiplier float64
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// InitialBackoff 初始退避时间
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InitialBackoff time.Duration
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}
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// DefaultRetryWorkerConfig 返回默认重试工作器配置
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func DefaultRetryWorkerConfig() RetryWorkerConfig {
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return RetryWorkerConfig{
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RetryInterval: 30 * time.Second,
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MaxRetryCount: 5,
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BatchSize: 100,
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BackoffMultiplier: 2.0,
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InitialBackoff: 1 * time.Minute,
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}
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}
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// RetryWorker 重试工作器,负责处理失败的存证操作
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type RetryWorker struct {
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config RetryWorkerConfig
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manager *PersistenceManager
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publisher message.Publisher
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logger logger.Logger
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stopChan chan struct{}
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stoppedChan chan struct{}
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}
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// NewRetryWorker 创建重试工作器
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func NewRetryWorker(
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config RetryWorkerConfig,
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manager *PersistenceManager,
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publisher message.Publisher,
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log logger.Logger,
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) *RetryWorker {
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return &RetryWorker{
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config: config,
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manager: manager,
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publisher: publisher,
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logger: log,
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stopChan: make(chan struct{}),
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stoppedChan: make(chan struct{}),
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}
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}
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// Start 启动重试工作器
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func (w *RetryWorker) Start(ctx context.Context) {
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w.logger.InfoContext(ctx, "starting retry worker",
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"retryInterval", w.config.RetryInterval,
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"maxRetryCount", w.config.MaxRetryCount,
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"batchSize", w.config.BatchSize,
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)
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ticker := time.NewTicker(w.config.RetryInterval)
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defer ticker.Stop()
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defer close(w.stoppedChan)
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for {
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select {
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case <-ctx.Done():
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w.logger.InfoContext(ctx, "retry worker stopped by context")
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return
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case <-w.stopChan:
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w.logger.InfoContext(ctx, "retry worker stopped by signal")
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return
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case <-ticker.C:
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w.processRetries(ctx)
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}
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}
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}
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// Stop 停止重试工作器
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func (w *RetryWorker) Stop() {
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w.logger.Info("stopping retry worker")
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close(w.stopChan)
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<-w.stoppedChan
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w.logger.Info("retry worker stopped")
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}
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// processRetries 处理待重试的记录
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// 从重试表中读取待处理的记录,无需游标扫描 operation 表
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func (w *RetryWorker) processRetries(ctx context.Context) {
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w.logger.DebugContext(ctx, "processing retries from retry table")
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retryRepo := w.manager.GetRetryRepo()
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opRepo := w.manager.GetOperationRepo()
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// 直接从重试表查找待重试的记录(已到重试时间的记录)
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records, err := retryRepo.FindPendingRetries(ctx, w.config.BatchSize)
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if err != nil {
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w.logger.ErrorContext(ctx, "failed to find pending retries",
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"error", err,
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)
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return
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}
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if len(records) == 0 {
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w.logger.DebugContext(ctx, "no pending retries found")
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return
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}
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w.logger.InfoContext(ctx, "found pending retries from retry table",
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"count", len(records),
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"batchSize", w.config.BatchSize,
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)
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// 处理每条重试记录
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for _, record := range records {
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w.processRetry(ctx, record, retryRepo, opRepo)
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}
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}
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// processRetry 处理单个重试记录
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func (w *RetryWorker) processRetry(
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ctx context.Context,
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record RetryRecord,
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retryRepo RetryRepository,
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opRepo OperationRepository,
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) {
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w.logger.DebugContext(ctx, "processing retry",
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"opID", record.OpID,
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"retryCount", record.RetryCount,
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)
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// 检查是否超过最大重试次数
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if record.RetryCount >= w.config.MaxRetryCount {
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w.logger.WarnContext(ctx, "max retry count exceeded, marking as dead letter",
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"opID", record.OpID,
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"retryCount", record.RetryCount,
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)
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if err := retryRepo.MarkAsDeadLetter(ctx, record.OpID,
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fmt.Sprintf("exceeded max retry count (%d)", w.config.MaxRetryCount)); err != nil {
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w.logger.ErrorContext(ctx, "failed to mark as dead letter",
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"opID", record.OpID,
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"error", err,
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)
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}
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return
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}
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// 查找操作记录
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op, status, err := opRepo.FindByID(ctx, record.OpID)
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if err != nil {
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w.logger.ErrorContext(ctx, "failed to find operation for retry",
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"opID", record.OpID,
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"error", err,
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)
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nextRetry := w.calculateNextRetry(record.RetryCount)
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retryRepo.IncrementRetry(ctx, record.OpID, err.Error(), nextRetry)
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return
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}
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// 如果已经存证,删除重试记录
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if status == StatusTrustlogged {
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w.logger.InfoContext(ctx, "operation already trustlogged, removing retry record",
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"opID", record.OpID,
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)
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if err := retryRepo.DeleteRetry(ctx, record.OpID); err != nil {
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w.logger.ErrorContext(ctx, "failed to delete retry record",
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"opID", record.OpID,
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"error", err,
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)
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}
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return
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}
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// 尝试重新发布到存证系统
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// 这里需要根据实际的存证逻辑来实现
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// 示例:将操作发送到消息队列
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if err := w.republishOperation(ctx, op); err != nil {
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w.logger.ErrorContext(ctx, "failed to republish operation",
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"opID", record.OpID,
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"error", err,
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)
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nextRetry := w.calculateNextRetry(record.RetryCount)
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retryRepo.IncrementRetry(ctx, record.OpID, err.Error(), nextRetry)
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return
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}
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// 发布成功,更新状态为已存证
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if err := opRepo.UpdateStatus(ctx, record.OpID, StatusTrustlogged); err != nil {
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w.logger.ErrorContext(ctx, "failed to update operation status",
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"opID", record.OpID,
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"error", err,
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)
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return
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}
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// 删除重试记录
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if err := retryRepo.DeleteRetry(ctx, record.OpID); err != nil {
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w.logger.ErrorContext(ctx, "failed to delete retry record",
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"opID", record.OpID,
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"error", err,
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)
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return
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}
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w.logger.InfoContext(ctx, "operation retry successful",
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"opID", record.OpID,
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"retryCount", record.RetryCount,
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)
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}
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// republishOperation 重新发布操作到存证系统
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// 注意:这里需要序列化为 Envelope 格式
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func (w *RetryWorker) republishOperation(ctx context.Context, op *model.Operation) error {
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// 这里需要根据实际的发布逻辑来实现
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// 简化实现:假设 publisher 已经配置好
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if w.publisher == nil {
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return fmt.Errorf("publisher not configured")
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}
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// 注意:实际使用时需要使用 Envelope 序列化
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// 这里只是示例,具体实现需要在 HighClient 中集成
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w.logger.WarnContext(ctx, "republish not implemented yet, needs Envelope serialization",
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"opID", op.OpID,
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)
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return nil
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}
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// calculateNextRetry 计算下次重试时间(指数退避)
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func (w *RetryWorker) calculateNextRetry(retryCount int) time.Time {
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backoff := float64(w.config.InitialBackoff)
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for i := 0; i < retryCount; i++ {
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backoff *= w.config.BackoffMultiplier
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}
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return time.Now().Add(time.Duration(backoff))
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}
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