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71 lines
1.6 KiB
71 lines
1.6 KiB
package localchat
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import (
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"encoding/json"
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"log"
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"net"
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"os"
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"time"
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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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Time: time.Now(),
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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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