迭代计划准备
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# 基础设施:站内消息(Notification)
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> 被依赖:需求 18/20/21(审批流通知)、需求 22(临期提醒)
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> 状态:待评审
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> 被依赖:需求 18/20/21(审批流通知)、需求 22(临期提醒)
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> Phase 2 扩展:企业微信推送、短信通知(预留插拔接口)
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---
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## 一、设计原则
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- **业务代码不直接写通知**:只发 Asynq 任务,异步处理
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- **业务代码不直接写通知表**:统一通过通知发布器或领域事件异步处理
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- **关键领域事件先写 Outbox**:审批、退款、充值等事务内事件由 Outbox Relay 投递 Asynq,禁止事务提交后直接入队
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- **通知消费必须幂等**:使用稳定的 `event_id` 和接收人唯一约束,Asynq 重试不得重复生成站内消息
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- **不过度抽象**:不用 interface,用具体的 `NotificationPublisher`(后续加渠道 = 在 handler 里加代码)
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- **前端轮询**:30秒一次 `/admin/notifications/unread-count`,不用 WebSocket
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- **前端轮询**:30秒一次 `/api/admin/notifications/unread-count`,不用 WebSocket
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```mermaid
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sequenceDiagram
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participant Biz as 业务事务
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participant Outbox as Outbox
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participant Relay as Relay
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participant Worker as Notification Worker
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participant DB as tb_notification
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participant Web as 后台前端
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Biz->>Outbox: 同事务写领域事件
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Relay->>Outbox: 拉取待投递事件
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Relay->>Worker: 至少一次投递
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Worker->>DB: 按 event_id + recipient 幂等插入
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Web->>DB: 经 API 轮询未读数/通知列表
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Web->>DB: 经 API 标记已读
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```
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---
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@@ -19,12 +39,13 @@
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-- 迁移文件:YYYYMMDD_create_tb_notification.sql
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CREATE TABLE tb_notification (
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id BIGSERIAL PRIMARY KEY,
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event_id VARCHAR(64) NOT NULL, -- 领域事件ID或调用方请求ID,用于幂等
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recipient_id BIGINT NOT NULL, -- 用户ID(admin user 或 agent user)
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recipient_type VARCHAR(20) NOT NULL DEFAULT 'admin', -- admin | agent
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type VARCHAR(50) NOT NULL, -- 通知类型(见常量定义)
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title VARCHAR(200) NOT NULL, -- 标题
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body TEXT NOT NULL DEFAULT '', -- 正文(支持简单 HTML)
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ref_type VARCHAR(50), -- 关联业务类型 approval | recharge | refund | package
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body TEXT NOT NULL DEFAULT '', -- 纯文本正文
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ref_type VARCHAR(50), -- 关联业务类型 approval | recharge | refund | iot_card | device
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ref_id BIGINT, -- 关联业务ID
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is_read BOOLEAN NOT NULL DEFAULT FALSE,
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read_at TIMESTAMPTZ,
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@@ -32,8 +53,11 @@ CREATE TABLE tb_notification (
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expires_at TIMESTAMPTZ -- 过期自动不展示(可选,临期提醒用)
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);
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CREATE INDEX idx_notification_recipient ON tb_notification (recipient_id, recipient_type, is_read);
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CREATE INDEX idx_notification_recipient
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ON tb_notification (recipient_id, recipient_type, is_read, created_at DESC);
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CREATE INDEX idx_notification_created ON tb_notification (created_at DESC);
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CREATE UNIQUE INDEX uq_notification_event_recipient
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ON tb_notification (event_id, recipient_id, recipient_type);
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COMMENT ON TABLE tb_notification IS '站内消息通知表';
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```
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@@ -72,8 +96,9 @@ const (
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// Notification 站内消息模型
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type Notification struct {
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ID uint `gorm:"column:id;primaryKey" json:"id"`
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RecipientID uint `gorm:"column:recipient_id;not null;index" json:"recipient_id"`
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RecipientType string `gorm:"column:recipient_type;type:varchar(20);not null;default:'admin'" json:"recipient_type"`
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EventID string `gorm:"column:event_id;type:varchar(64);not null;uniqueIndex:uq_notification_event_recipient,priority:1" json:"event_id"`
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RecipientID uint `gorm:"column:recipient_id;not null;index;uniqueIndex:uq_notification_event_recipient,priority:2" json:"recipient_id"`
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RecipientType string `gorm:"column:recipient_type;type:varchar(20);not null;default:'admin';uniqueIndex:uq_notification_event_recipient,priority:3" json:"recipient_type"`
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Type string `gorm:"column:type;type:varchar(50);not null" json:"type"`
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Title string `gorm:"column:title;type:varchar(200);not null" json:"title"`
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Body string `gorm:"column:body;type:text;not null;default:''" json:"body"`
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@@ -92,13 +117,16 @@ func (Notification) TableName() string { return "tb_notification" }
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## 五、发布侧:NotificationPublisher
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业务代码调这个发布通知,内部异步入队:
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非事务性、允许调用方直接发起的通知使用发布器异步入队。审批等领域事件不直接调用该发布器,而由 `TaskCreated`、`ProcessApproved` 等事件处理器转换为通知载荷。
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领域事件通知使用领域事件自身的 `event_id`;非领域事件调用方使用稳定的业务请求 ID。网络重试或 Asynq 重试时禁止重新生成 ID。
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```go
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// internal/service/notification/publisher.go
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// internal/infrastructure/messaging/notification_publisher.go
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// SendPayload 发送通知的参数
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type SendPayload struct {
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EventID string // 领域事件ID或调用方请求ID,同一次重试必须保持不变
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RecipientIDs []uint // 接收人ID列表
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RecipientType string // admin | agent
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Type string // 通知类型常量
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@@ -115,29 +143,37 @@ type NotificationPublisher struct {
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logger *zap.Logger
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}
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// Publish 发布通知(异步,不阻塞业务)
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// 失败只记录日志,不影响业务事务
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func (p *NotificationPublisher) Publish(ctx context.Context, payload SendPayload) {
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// Publish 发布通知(异步)
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// 返回错误供调用方或 Asynq Handler 决定重试,禁止吞掉关键通知错误。
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func (p *NotificationPublisher) Publish(ctx context.Context, payload SendPayload) error {
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if payload.EventID == "" {
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return errors.New(errors.CodeInvalidParam, "通知事件ID不能为空")
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}
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if err := p.queueClient.EnqueueTask(ctx, constants.TaskTypeNotification, payload); err != nil {
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p.logger.Error("通知入队失败", zap.Error(err), zap.String("type", payload.Type))
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return err
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}
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return nil
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}
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```
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业务代码调用示例(审批推进后通知下一审批人):
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审批事件处理器调用示例(节点激活后通知候选审批人):
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```go
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p.notifyPublisher.Publish(ctx, notification.SendPayload{
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return h.notifyPublisher.Publish(ctx, notification.SendPayload{
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EventID: event.EventID,
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RecipientIDs: []uint{nextApproverID},
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RecipientType: constants.NotifyRecipientAdmin,
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Type: constants.NotifyTypeApprovalPending,
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Title: "您有一条待审批记录",
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Body: fmt.Sprintf("代理「%s」提交了充值申请,请及时审批。", shopName),
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RefType: "approval",
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RefID: approvalFlowID,
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RefID: processInstanceID,
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})
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```
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审批事务中只写 `TaskCreated` Outbox 事件。即使 Redis/Asynq 暂时不可用,事件仍保留在数据库,由 Relay 重试;通知处理失败则由 Asynq 重试当前任务。
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---
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## 六、消费侧:Asynq Task Handler
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@@ -164,6 +200,7 @@ func (h *NotificationHandler) HandleNotification(ctx context.Context, t *asynq.T
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ref_id = &payload.RefID
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}
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records = append(records, model.Notification{
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EventID: payload.EventID,
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RecipientID: uid,
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RecipientType: payload.RecipientType,
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Type: payload.Type,
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@@ -175,7 +212,9 @@ func (h *NotificationHandler) HandleNotification(ctx context.Context, t *asynq.T
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})
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}
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if err := h.db.WithContext(ctx).CreateInBatches(records, 100).Error; err != nil {
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if err := h.db.WithContext(ctx).
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Clauses(clause.OnConflict{DoNothing: true}).
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CreateInBatches(records, 100).Error; err != nil {
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return fmt.Errorf("批量写入通知失败: %w", err)
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}
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@@ -193,7 +232,7 @@ func (h *NotificationHandler) HandleNotification(ctx context.Context, t *asynq.T
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### 7.1 未读数量(前端轮询用,30秒一次)
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```
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GET /admin/notifications/unread-count
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GET /api/admin/notifications/unread-count
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```
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响应:
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@@ -204,7 +243,7 @@ GET /admin/notifications/unread-count
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### 7.2 通知列表
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```
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GET /admin/notifications?is_read=false&type=approval.pending&page=1&page_size=20
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GET /api/admin/notifications?is_read=false&type=approval.pending&page=1&page_size=20
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```
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请求参数:
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@@ -244,13 +283,13 @@ type NotificationListRequest struct {
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### 7.3 标记已读
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```
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PUT /admin/notifications/{id}/read
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PUT /api/admin/notifications/{id}/read
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```
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### 7.4 全部标记已读
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```
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PUT /admin/notifications/read-all
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PUT /api/admin/notifications/read-all
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```
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可传 `type` 过滤(只把某类型全部已读):
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@@ -298,29 +337,32 @@ type ReadAllRequest struct {
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### 顶部导航栏铃铛
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```
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组件挂载 → 轮询 GET /admin/notifications/unread-count(30秒一次)
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组件挂载 → 轮询 GET /api/admin/notifications/unread-count(30秒一次)
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→ count > 0 时铃铛显示红点 + 数字
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→ 点击铃铛 → 弹出通知抽屉 or 跳转 /notifications 页面
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→ 打开时调 GET /admin/notifications?is_read=false
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→ 点击某条通知 → PUT /admin/notifications/{id}/read → 根据 ref_type+ref_id 跳转对应业务页
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→ 打开时调 GET /api/admin/notifications?is_read=false
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→ 点击某条通知 → PUT /api/admin/notifications/{id}/read → 根据 ref_type+ref_id 跳转对应业务页
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```
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### 跳转逻辑(ref_type)
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| ref_type | 跳转页面 |
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|----------|---------|
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| `approval` | `/approval/{ref_id}` 审批详情 |
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| `recharge` | `/recharge/{ref_id}` 充值单详情 |
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| `refund` | `/refund/{ref_id}` 退款单详情 |
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| `package` | `/assets/{ref_id}` 资产详情(临期提醒) |
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| `approval` | `/approvals/instances/{ref_id}` 审批详情 |
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| `recharge` | `/agent-recharges/{ref_id}` 充值单详情 |
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| `refund` | `/refunds/{ref_id}` 退款单详情 |
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| `iot_card` | `/iot-cards/{ref_id}` IoT卡详情(临期提醒) |
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| `device` | `/devices/{ref_id}` 设备详情(临期提醒) |
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### 通知列表页(/notifications)
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筛选:通知类型(下拉)、已读状态
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操作:全部已读按钮
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列表字段:类型、标题、时间、已读状态
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筛选:通知类型(下拉)、已读状态
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操作:全部已读按钮
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列表字段:类型、标题、时间、已读状态
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点击行:跳转关联业务详情
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前端页面不可见时暂停未读数轮询,恢复可见时立即刷新。通知正文按纯文本渲染;未来需要富文本时使用受控模板和统一净化,禁止直接渲染业务方提交的 HTML。
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---
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## 九、Phase 2 扩展预留
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Reference in New Issue
Block a user