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change udp

master
skyboy 9 months ago
parent
commit
054915be6e
  1. 54
      godo/localchat/udp.go

54
godo/localchat/udp.go

@ -20,11 +20,13 @@ type UdpMessage struct {
// 多播地址列表
var multicastAddrs = []string{"239.255.255.250:2024", "239.255.255.251:2024", "224.0.0.251:1234", "224.0.0.1:1679"}
var OnlineUsers = make(map[string]UdpMessage) // 全局map,key为IP,value为主机名
// SendMulticast 发送多播消息
func init() {
go InitMulticast()
go ListenForMulticast()
}
func InitMulticast() {
myIP, myHostname, err := GetMyIPAndHostname()
if err != nil {
@ -38,6 +40,7 @@ func InitMulticast() {
}
SendMulticast(message)
}
func SendMulticast(message UdpMessage) error {
for _, addrStr := range multicastAddrs {
addr, err := net.ResolveUDPAddr("udp4", addrStr)
@ -69,9 +72,20 @@ func SendMulticast(message UdpMessage) error {
// ListenForMulticast 监听多播消息
func ListenForMulticast() {
multicastGroup, err := net.ResolveUDPAddr("udp4", multicastAddrs[0])
// 选择一个可用的多播地址
var multicastGroup *net.UDPAddr
var err error
for _, addrStr := range multicastAddrs {
multicastGroup, err = net.ResolveUDPAddr("udp4", addrStr)
if err != nil {
fmt.Println("Error resolving UDP address:", err)
continue
}
break
}
if multicastGroup == nil {
fmt.Println("No available multicast address found")
return
}
@ -81,8 +95,40 @@ func ListenForMulticast() {
return
}
defer conn.Close()
udpConn := ipv4.NewPacketConn(conn)
if err := udpConn.JoinGroup(nil, multicastGroup); err != nil {
// 获取本地网络接口
localIfaces, err := net.Interfaces()
if err != nil {
log.Fatalf("Failed to get local interfaces: %v", err)
}
// 选择一个可用的网络接口
var localInterface *net.Interface
for _, iface := range localIfaces {
addrs, err := iface.Addrs()
if err != nil {
continue
}
for _, addr := range addrs {
if ipNet, ok := addr.(*net.IPNet); ok && !ipNet.IP.IsLoopback() {
if ipNet.IP.To4() != nil {
localInterface = &iface
break
}
}
}
if localInterface != nil {
break
}
}
if localInterface == nil {
log.Fatal("No suitable network interface found")
}
if err := udpConn.JoinGroup(localInterface, multicastGroup); err != nil {
log.Fatalf("Failed to join multicast group: %v", err)
}
@ -140,6 +186,7 @@ func SendToIP(ip string, message UdpMessage) error {
func GetOnlineUsers() map[string]UdpMessage {
return OnlineUsers
}
func HandleMessage(w http.ResponseWriter, r *http.Request) {
var msg UdpMessage
decoder := json.NewDecoder(r.Body)
@ -155,14 +202,11 @@ func HandleMessage(w http.ResponseWriter, r *http.Request) {
return
}
msg.IP = preferredIP
//msg.Type = "text"
err = SendToIP(ip, msg)
if err != nil {
http.Error(w, "Failed to send message", http.StatusInternalServerError)
return
}
//log.Printf("Received text message from %s: %s", msg.SenderInfo.IP, msg.Content)
// 这里可以添加存储文本消息到数据库或其他处理逻辑
w.WriteHeader(http.StatusOK)
fmt.Fprintln(w, "Text message send successfully")
}

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