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164 lines
3.7 KiB
164 lines
3.7 KiB
package localchat
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import (
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"encoding/json"
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"godo/libs"
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"log"
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"net"
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"os"
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"strings"
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"time"
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)
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type UdpMessage struct {
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Hostname string `json:"hostname"`
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Type string `json:"type"`
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Time time.Time `json:"time"`
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IP string `json:"ip"`
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Message any `json:"message"`
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}
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type UdpAddress struct {
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Hostname string `json:"hostname"`
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IP string `json:"ip"`
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}
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var OnlineUsers []UdpAddress
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func init() {
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go InitBroadcast()
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go ListenForBroadcast()
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}
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func InitBroadcast() {
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ticker := time.NewTicker(5 * time.Second) // 每 5 秒发送一次广播消息
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defer ticker.Stop()
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for range ticker.C {
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hostname, err := os.Hostname()
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if err != nil {
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log.Printf("Failed to get hostname: %v", err)
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continue
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}
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message := UdpMessage{
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Type: "online",
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Hostname: hostname,
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Message: "",
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}
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//发送多播消息
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broadcastAddr := GetBroadcastAddr()
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err = SendBroadcast(broadcastAddr, message)
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if err != nil {
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log.Println("Failed to send broadcast message:", err)
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}
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}
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}
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func SendBroadcast(broadcastAddr string, message UdpMessage) error {
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addr, err := net.ResolveUDPAddr("udp4", broadcastAddr)
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if err != nil {
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log.Printf("Failed to resolve UDP address %s: %v", broadcastAddr, err)
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return err
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}
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// 使用本地地址进行连接
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localAddr, err := net.ResolveUDPAddr("udp4", "0.0.0.0:0")
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if err != nil {
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log.Printf("Failed to resolve local UDP address: %v", err)
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return err
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}
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conn, err := net.ListenUDP("udp4", localAddr)
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if err != nil {
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log.Printf("Failed to listen on UDP address %s: %v", broadcastAddr, err)
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return err
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}
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defer conn.Close()
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data, err := json.Marshal(message)
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if err != nil {
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log.Printf("Failed to marshal JSON for %s: %v", broadcastAddr, err)
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return err
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}
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_, err = conn.WriteToUDP(data, addr)
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if err != nil {
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log.Printf("Failed to write to UDP address %s: %v", broadcastAddr, err)
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return err
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}
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log.Printf("发送消息到 %s 成功", broadcastAddr)
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return nil
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}
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// ListenForBroadcast 监听多播消息
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func ListenForBroadcast() {
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broadcastAddr := GetBroadcastAddr()
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addr, err := net.ResolveUDPAddr("udp4", broadcastAddr)
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if err != nil {
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log.Fatalf("Failed to resolve UDP address: %v", err)
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}
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// 使用 ListenMulticastUDP 创建多播连接
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conn, err := net.ListenMulticastUDP("udp4", nil, addr)
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if err != nil {
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log.Fatalf("Failed to listen on UDP address: %v", err)
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}
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defer conn.Close()
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// 获取本地 IP 地址
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ips, err := libs.GetValidIPAddresses()
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if err != nil {
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log.Fatalf("Failed to get local IP addresses: %v", err)
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}
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// 开始监听多播消息
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buffer := make([]byte, 1024)
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for {
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n, remoteAddr, err := conn.ReadFromUDP(buffer)
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if err != nil {
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log.Printf("Error reading from UDP: %v", err)
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continue
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}
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var udpMsg UdpMessage
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err = json.Unmarshal(buffer[:n], &udpMsg)
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if err != nil {
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log.Printf("Error unmarshalling JSON: %v", err)
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continue
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}
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// 从 remoteAddr 获取 IP 地址
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ip := remoteAddr.IP.String()
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if containArr(ips, ip) {
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continue
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}
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if !containIp(OnlineUsers, ip) {
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OnlineUsers = append(OnlineUsers, UdpAddress{Hostname: udpMsg.Hostname, IP: ip})
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log.Printf("在线用户: %v", OnlineUsers)
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}
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log.Printf("Received message from %s: %s", remoteAddr, udpMsg.Hostname)
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}
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}
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func containArr(s []string, str string) bool {
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for _, v := range s {
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if v == str {
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return true
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}
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}
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return false
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}
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func containIp(slice []UdpAddress, element string) bool {
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for _, v := range slice {
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if v.IP == element {
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return true
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}
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}
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return false
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}
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func GetOnlineUsers() []UdpAddress {
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return OnlineUsers
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}
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func GetBroadcastAddr() string {
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return "224.0.0.251:20249"
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}
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func GetBroadcastPort() string {
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addr := GetBroadcastAddr()
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return addr[strings.LastIndex(addr, ":")+1:]
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}
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