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44 lines
943 B
44 lines
943 B
package localchat
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import (
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"encoding/json"
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"fmt"
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"log"
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"net"
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)
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func StartServiceDiscovery() {
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// 解析多播地址
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addr, err := net.ResolveUDPAddr("udp4", broadcastAddr)
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if err != nil {
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fmt.Println("Error resolving multicast address:", err)
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return
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}
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// 监听本地网络接口上的多播地址
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conn, err := net.ListenMulticastUDP("udp4", nil, addr)
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if err != nil {
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fmt.Println("Error listening on multicast address:", err)
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return
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}
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defer conn.Close()
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buffer := make([]byte, 1024)
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for {
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n, addr, 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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fmt.Printf("Received message: %s from %s\n", buffer[:n], addr)
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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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fmt.Printf("Error unmarshalling JSON: %v\n", err)
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continue
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}
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log.Printf("Get message: %+v", udpMsg)
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OnlineUsers[udpMsg.IP] = udpMsg
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}
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}
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