feat(im): Task 4 - WS 事件处理器 + 离线消息推送
EventHandler: - im.message.send: 发送消息（解析→业务→ACK+推送） - im.message.recall: 撤回消息 - im.conversation.read: 标记已读 - im.typing: 正在输入通知（转发对方） - 所有事件通过 Hub.RegisterEvent 注册到路由表 OfflinePusher: - PushOfflineMessages: 推送未读会话摘要 + 全局未读总数 - 通过 OfflineMessagePusher 接口注入 WS Handler - WebSocket 连接建立后自动触发离线推送 Made-with: Cursor
This commit is contained in:
bujinyuan
155
backend/go-service/app/im/handler/event_handler.go
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155
backend/go-service/app/im/handler/event_handler.go
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// Package handler 提供 IM 模块的 WebSocket 事件处理器
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// 通过 Hub.RegisterEvent 注册到事件路由表，处理 im.* 系列事件
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package handler
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import (
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"context"
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"encoding/json"
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"github.com/echochat/backend/app/dto"
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"github.com/echochat/backend/app/im/service"
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"github.com/echochat/backend/pkg/logs"
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"github.com/echochat/backend/pkg/ws"
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"go.uber.org/zap"
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)
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// EventHandler IM 模块的 WS 事件处理器
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type EventHandler struct {
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imService *service.IMService
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hub *ws.Hub
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}
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// NewEventHandler 创建 EventHandler 实例并注册事件到 Hub 路由表
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func NewEventHandler(imService *service.IMService, hub *ws.Hub) *EventHandler {
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h := &EventHandler{
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imService: imService,
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hub: hub,
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}
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h.registerEvents()
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return h
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}
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// registerEvents 将 IM 事件处理函数注册到 Hub 路由表
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func (h *EventHandler) registerEvents() {
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h.hub.RegisterEvent("im.message.send", h.handleSendMessage)
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h.hub.RegisterEvent("im.message.recall", h.handleRecallMessage)
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h.hub.RegisterEvent("im.conversation.read", h.handleMarkRead)
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h.hub.RegisterEvent("im.typing", h.handleTyping)
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}
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// handleSendMessage 处理发送消息事件
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func (h *EventHandler) handleSendMessage(client *ws.Client, msg *ws.Message) {
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funcName := "handler.event_handler.handleSendMessage"
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ctx := context.Background()
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var req dto.SendMessageRequest
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if err := json.Unmarshal(msg.Data, &req); err != nil {
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logs.Warn(ctx, funcName, "解析消息请求失败",
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zap.Int64("user_id", client.UserID), zap.Error(err))
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h.sendACK(client, msg, -1, "请求参数格式错误", nil)
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return
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}
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msgDTO, err := h.imService.SendMessage(ctx, client.UserID, &req)
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if err != nil {
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if err == service.ErrDuplicateMsg && msgDTO != nil {
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h.sendACK(client, msg, 0, "ok", msgDTO)
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return
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}
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logs.Warn(ctx, funcName, "发送消息失败",
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zap.Int64("user_id", client.UserID), zap.Error(err))
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h.sendACK(client, msg, -1, err.Error(), nil)
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return
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}
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h.sendACK(client, msg, 0, "ok", msgDTO)
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}
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// handleRecallMessage 处理撤回消息事件
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func (h *EventHandler) handleRecallMessage(client *ws.Client, msg *ws.Message) {
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funcName := "handler.event_handler.handleRecallMessage"
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ctx := context.Background()
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var req dto.RecallMessageRequest
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if err := json.Unmarshal(msg.Data, &req); err != nil {
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logs.Warn(ctx, funcName, "解析撤回请求失败",
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zap.Int64("user_id", client.UserID), zap.Error(err))
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h.sendACK(client, msg, -1, "请求参数格式错误", nil)
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return
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}
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if err := h.imService.RecallMessage(ctx, client.UserID, req.MessageID); err != nil {
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logs.Warn(ctx, funcName, "撤回消息失败",
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zap.Int64("user_id", client.UserID), zap.Error(err))
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h.sendACK(client, msg, -1, err.Error(), nil)
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return
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}
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h.sendACK(client, msg, 0, "ok", nil)
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}
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// handleMarkRead 处理标记已读事件
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func (h *EventHandler) handleMarkRead(client *ws.Client, msg *ws.Message) {
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funcName := "handler.event_handler.handleMarkRead"
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ctx := context.Background()
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var req dto.MarkReadRequest
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if err := json.Unmarshal(msg.Data, &req); err != nil {
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logs.Warn(ctx, funcName, "解析已读请求失败",
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zap.Int64("user_id", client.UserID), zap.Error(err))
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h.sendACK(client, msg, -1, "请求参数格式错误", nil)
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return
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}
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if err := h.imService.MarkRead(ctx, client.UserID, req.ConversationID); err != nil {
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logs.Warn(ctx, funcName, "标记已读失败",
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zap.Int64("user_id", client.UserID), zap.Error(err))
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h.sendACK(client, msg, -1, err.Error(), nil)
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return
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}
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h.sendACK(client, msg, 0, "ok", nil)
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}
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// handleTyping 处理正在输入事件（转发给对方）
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func (h *EventHandler) handleTyping(client *ws.Client, msg *ws.Message) {
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funcName := "handler.event_handler.handleTyping"
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ctx := context.Background()
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var req dto.TypingRequest
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if err := json.Unmarshal(msg.Data, &req); err != nil {
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logs.Warn(ctx, funcName, "解析输入状态请求失败",
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zap.Int64("user_id", client.UserID), zap.Error(err))
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return
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}
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peerID, err := h.imService.GetPeerUserID(ctx, req.ConversationID, client.UserID)
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if err != nil {
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logs.Warn(ctx, funcName, "查询对方用户 ID 失败",
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zap.Int64("conversation_id", req.ConversationID), zap.Error(err))
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return
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}
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push := ws.NewPushMessage("im.typing", map[string]interface{}{
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"conversation_id": req.ConversationID,
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"user_id": client.UserID,
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})
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data, err := ws.MarshalPush(push)
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if err != nil {
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return
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}
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h.hub.SendToUser(peerID, data)
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}
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// sendACK 发送 ACK 响应给客户端
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func (h *EventHandler) sendACK(client *ws.Client, msg *ws.Message, code int, message string, data interface{}) {
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resp := ws.NewResponse(msg.Event, msg.Seq, code, message, data)
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bytes, err := ws.MarshalResponse(resp)
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if err != nil {
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logs.Error(context.Background(), "handler.event_handler.sendACK", "序列化 ACK 失败",
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zap.Error(err))
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return
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}
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client.Send(bytes)
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}
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84
backend/go-service/app/im/handler/offline_pusher.go
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84
backend/go-service/app/im/handler/offline_pusher.go
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@@ -0,0 +1,84 @@
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package handler
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import (
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"context"
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"github.com/echochat/backend/app/im/dao"
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"github.com/echochat/backend/app/im/service"
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"github.com/echochat/backend/pkg/logs"
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"github.com/echochat/backend/pkg/ws"
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"go.uber.org/zap"
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)
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// OfflinePusher 离线消息推送器
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// 在用户 WebSocket 重新连接后，主动推送未读会话摘要
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type OfflinePusher struct {
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imService *service.IMService
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convDAO *dao.ConversationDAO
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pubsub *ws.PubSub
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}
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// NewOfflinePusher 创建 OfflinePusher 实例
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func NewOfflinePusher(imService *service.IMService, convDAO *dao.ConversationDAO, pubsub *ws.PubSub) *OfflinePusher {
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return &OfflinePusher{
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imService: imService,
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convDAO: convDAO,
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pubsub: pubsub,
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}
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}
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// PushOfflineMessages 向用户推送离线消息摘要
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// 包含所有有未读消息的会话信息和全局未读总数
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func (p *OfflinePusher) PushOfflineMessages(ctx context.Context, userID int64) {
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funcName := "handler.offline_pusher.PushOfflineMessages"
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logs.Info(ctx, funcName, "推送离线消息", zap.Int64("user_id", userID))
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unreadConvs, err := p.convDAO.GetUnreadConversations(ctx, userID)
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if err != nil {
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logs.Error(ctx, funcName, "查询未读会话失败", zap.Error(err))
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return
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}
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totalUnread, err := p.imService.GetTotalUnread(ctx, userID)
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if err != nil {
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logs.Error(ctx, funcName, "查询全局未读数失败", zap.Error(err))
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totalUnread = 0
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}
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if len(unreadConvs) == 0 && totalUnread == 0 {
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return
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}
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convList := make([]map[string]interface{}, 0, len(unreadConvs))
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for _, c := range unreadConvs {
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item := map[string]interface{}{
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"conversation_id": c.ID,
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"unread_count": c.UnreadCount,
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"last_msg_content": c.LastMsgContent,
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}
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if c.LastMsgTime != nil {
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item["last_msg_time"] = c.LastMsgTime.Format("2006-01-02 15:04:05")
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}
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convList = append(convList, item)
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}
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push := ws.NewPushMessage("im.offline.sync", map[string]interface{}{
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"total_unread": totalUnread,
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"conversations": convList,
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})
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data, err := ws.MarshalPush(push)
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if err != nil {
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logs.Error(ctx, funcName, "序列化离线消息失败", zap.Error(err))
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return
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}
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if err := p.pubsub.Publish(ctx, userID, data); err != nil {
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logs.Error(ctx, funcName, "推送离线消息失败",
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zap.Int64("user_id", userID), zap.Error(err))
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}
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logs.Info(ctx, funcName, "离线消息推送完成",
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zap.Int64("user_id", userID),
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zap.Int("unread_conv_count", len(unreadConvs)),
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zap.Int64("total_unread", totalUnread))
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}
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