package sys import ( "encoding/json" "fmt" "net/http" "sync" "time" ) // 定义消息结构体 type Message struct { Type string `json:"type"` Data interface{} `json:"data"` } // 定义一个结构体来保存客户端连接 type client struct { conn http.ResponseWriter } var clients = make(map[*client]bool) var mutex sync.Mutex // 处理客户端连接 func HandleSystemEvents(w http.ResponseWriter, r *http.Request) { // 设置响应头 w.Header().Set("Content-Type", "text/event-stream") w.Header().Set("Cache-Control", "no-cache") w.Header().Set("Connection", "keep-alive") // 创建客户端连接对象 c := &client{conn: w} // 添加客户端到列表 mutex.Lock() clients[c] = true mutex.Unlock() // 发送初始消息 updateInfo, err := GetUpdateInfo() if err == nil { SendToClient(c, Message{ Type: "update", Data: updateInfo, }) } // 监听客户端关闭 defer func() { mutex.Lock() delete(clients, c) mutex.Unlock() }() // 读取客户端请求直到关闭 for { select { case <-r.Context().Done(): return } } } // 向客户端发送消息 func SendToClient(c *client, msg Message) { jsonMsg, err := json.Marshal(msg) if err != nil { fmt.Println("Error marshaling JSON:", err) return } fmt.Fprintf(c.conn, "data: %s\n\n", jsonMsg) c.conn.(http.Flusher).Flush() } // 广播消息给所有客户端 func Broadcast(msg Message) { mutex.Lock() defer mutex.Unlock() for c := range clients { SendToClient(c, msg) } } // 每隔一段时间广播一条消息 func SendMessagePeriodically(msg Message) { ticker := time.NewTicker(1 * time.Second) for range ticker.C { Broadcast(msg) } }