162 lines
4.0 KiB
Go
162 lines
4.0 KiB
Go
package advice
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import (
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"ai_scheduler/internal/biz"
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"ai_scheduler/internal/config"
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"ai_scheduler/internal/pkg"
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"encoding/json"
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"sync"
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"time"
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"github.com/gofiber/fiber/v2/log"
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"github.com/gofiber/websocket/v2"
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)
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// WxWsHub WebSocket 连接中心，管理前端 WebSocket 客户端并广播实时事件
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type WxWsHub struct {
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mu sync.RWMutex
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clients map[*wsClient]struct{}
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jwtSecret string
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}
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type wsClient struct {
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conn *websocket.Conn
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appId string // 订阅的微信 appId（subscribe 消息后设置）
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mu sync.Mutex
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}
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// NewWxWsHub 创建 WebSocket Hub（实现 biz.WsBroadcaster 接口）
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func NewWxWsHub(cfg *config.Config) *WxWsHub {
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return &WxWsHub{
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clients: make(map[*wsClient]struct{}),
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jwtSecret: cfg.JwtSecret,
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}
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}
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// wsEvent WebSocket 推送的事件格式
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type wsEvent struct {
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Event string `json:"event"`
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Data interface{} `json:"data"`
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}
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// WsHandler Fiber WebSocket 升级处理函数
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// 连接流程：
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// 1. 前端通过 ws://host/api/v1/advicer/ws?token=JWT 连接
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// 2. Hub 验证 JWT token
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// 3. 前端发送 {"action":"subscribe","appId":"xxx"} 订阅特定 appId 的事件
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// 4. Hub 向该 appId 的所有已订阅客户端广播事件
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func (h *WxWsHub) WsHandler(c *websocket.Conn) {
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// 验证 JWT token（从 query 参数获取）
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token := c.Query("token")
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if token == "" {
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log.Warn("ws connect: missing token")
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_ = c.Close()
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return
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}
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claims, err := pkg.ParseToken(token, h.jwtSecret)
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if err != nil || claims == nil {
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log.Warn("ws connect: invalid token")
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_ = c.Close()
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return
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}
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client := &wsClient{conn: c}
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h.register(client)
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defer h.unregister(client)
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log.Infof("ws client connected: user=%s", claims.Username)
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// 读取循环：处理客户端发来的消息（subscribe 等）
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for {
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_, msg, err := c.ReadMessage()
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if err != nil {
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// 连接关闭或读取错误，退出循环（defer 会清理）
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break
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}
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h.handleClientMsg(client, msg)
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}
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}
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// clientMsg 客户端发送的消息格式
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type clientMsg struct {
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Action string `json:"action"`
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AppId string `json:"appId"`
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}
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func (h *WxWsHub) handleClientMsg(client *wsClient, raw []byte) {
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var msg clientMsg
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if err := json.Unmarshal(raw, &msg); err != nil {
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return
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}
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switch msg.Action {
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case "subscribe":
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if msg.AppId != "" {
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client.mu.Lock()
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client.appId = msg.AppId
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client.mu.Unlock()
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log.Infof("[WS] client subscribed appId=%s", msg.AppId)
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} else {
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log.Warn("[WS] subscribe with empty appId")
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}
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case "ping":
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// 客户端心跳，回复 pong
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client.mu.Lock()
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_ = client.conn.WriteMessage(websocket.PongMessage, []byte("pong"))
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client.mu.Unlock()
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}
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}
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func (h *WxWsHub) register(c *wsClient) {
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h.mu.Lock()
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h.clients[c] = struct{}{}
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h.mu.Unlock()
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}
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func (h *WxWsHub) unregister(c *wsClient) {
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h.mu.Lock()
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if _, ok := h.clients[c]; ok {
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delete(h.clients, c)
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_ = c.conn.Close()
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}
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h.mu.Unlock()
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log.Info("ws client disconnected")
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}
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// Broadcast 向指定 appId 的所有已订阅客户端广播 JSON 事件（异步非阻塞）
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func (h *WxWsHub) Broadcast(appId string, event string, data interface{}) {
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h.mu.RLock()
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defer h.mu.RUnlock()
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payload, err := json.Marshal(wsEvent{Event: event, Data: data})
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if err != nil {
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return
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}
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clientCount := 0
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matchedCount := 0
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for client := range h.clients {
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client.mu.Lock()
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clientCount++
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if client.appId == appId {
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matchedCount++
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// 设置写超时，避免慢客户端阻塞广播
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_ = client.conn.SetWriteDeadline(time.Now().Add(3 * time.Second))
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_ = client.conn.WriteMessage(websocket.TextMessage, payload)
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_ = client.conn.SetWriteDeadline(time.Time{})
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}
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client.mu.Unlock()
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}
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log.Infof("[WS] Broadcast event=%s appId=%s clients=%d matched=%d", event, appId, clientCount, matchedCount)
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}
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// BroadcastOnline 广播在线状态变化
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func (h *WxWsHub) BroadcastOnline(appId string, online bool) {
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h.Broadcast(appId, "online_status", map[string]interface{}{
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"appId": appId,
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"online": online,
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})
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}
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// 编译期断言：WxWsHub 实现 biz.WsBroadcaster 接口
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var _ biz.WsBroadcaster = (*WxWsHub)(nil)
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