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114 lines
2.5 KiB
114 lines
2.5 KiB
package localchat
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import (
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"encoding/json"
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"fmt"
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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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Type string `json:"type"`
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IP string `json:"ip"`
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Hostname string `json:"hostname"`
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Message interface{} `json:"message"`
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}
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var OnlineUsers = make(map[string]UdpMessage)
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// SendBroadcast 发送广播消息
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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("224.0.0.251:20249", 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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err = SendBroadcast("255.255.255.255:20249", 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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// SendToIP 向指定的 IP 地址发送 UDP 消息
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func SendToIP(message UdpMessage) error {
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toIp := message.IP
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port := GetBroadcastPort()
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addr, err := net.ResolveUDPAddr("udp4", fmt.Sprintf("%s:%s", toIp, port))
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if err != nil {
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log.Printf("Failed to resolve UDP address %s:%s: %v", toIp, port, 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", toIp, err)
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return 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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localIP, err := GetLocalIP()
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if err != nil {
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log.Printf("Failed to get local IP address: %v", err)
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return err
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}
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message.IP = localIP
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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", toIp, 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", toIp, err)
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return err
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}
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log.Printf("发送 UDP 消息到 %s 成功", toIp)
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return nil
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}
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// 获取 OnlineUsers 的最新状态
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func GetOnlineUsers() map[string]UdpMessage {
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return OnlineUsers
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}
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func GetLocalIP() (string, error) {
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return libs.GetIPAddress()
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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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