package localchat import ( "encoding/json" "log" "net" "os" "time" ) func InitBroadcast() { ticker := time.NewTicker(5 * time.Second) // 每 5 秒发送一次广播消息 defer ticker.Stop() for range ticker.C { hostname, err := os.Hostname() if err != nil { log.Printf("Failed to get hostname: %v", err) continue } message := UdpMessage{ Type: "online", Hostname: hostname, Message: "", Time: time.Now(), } //发送多播消息 broadcastAddr := GetBroadcastAddr() err = SendBroadcast(broadcastAddr, message) if err != nil { log.Println("Failed to send broadcast message:", err) } } } func SendBroadcast(broadcastAddr string, message UdpMessage) error { addr, err := net.ResolveUDPAddr("udp4", broadcastAddr) if err != nil { log.Printf("Failed to resolve UDP address %s: %v", broadcastAddr, err) return err } // 使用本地地址进行连接 localAddr, err := net.ResolveUDPAddr("udp4", "0.0.0.0:0") if err != nil { log.Printf("Failed to resolve local UDP address: %v", err) return err } conn, err := net.ListenUDP("udp4", localAddr) if err != nil { log.Printf("Failed to listen on UDP address %s: %v", broadcastAddr, err) return err } defer conn.Close() data, err := json.Marshal(message) if err != nil { log.Printf("Failed to marshal JSON for %s: %v", broadcastAddr, err) return err } _, err = conn.WriteToUDP(data, addr) if err != nil { log.Printf("Failed to write to UDP address %s: %v", broadcastAddr, err) return err } log.Printf("发送消息到 %s 成功", broadcastAddr) return nil }