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111 lines
2.4 KiB
111 lines
2.4 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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"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 Messages struct {
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Messages []UdpMessage `json:"messages"`
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}
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type UserMessage struct {
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Messages map[string]*Messages `json:"messages"`
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Onlines map[string]UserStatus `json:"onlines"`
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}
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var OnlineUsers = make(map[string]UserStatus)
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var UserMessages = make(map[string]*Messages)
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func init() {
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go UdpServer()
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go CheckOnlines()
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}
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func CheckOnlines() {
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CheckOnline()
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ticker := time.NewTicker(60 * time.Second)
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defer ticker.Stop()
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for range ticker.C {
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// 检查客户端是否已断开连接
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CheckOnline()
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}
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}
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// UDP 服务器端逻辑
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func UdpServer() {
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// 监听 UDP 端口
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listener, err := net.ListenPacket("udp", ":56780")
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if err != nil {
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log.Fatalf("error setting up listener: %v", err)
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}
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defer listener.Close()
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log.Println("UDP server started on :56780")
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// 监听 UDP 请求
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for {
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buffer := make([]byte, 1024)
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n, remoteAddr, err := listener.ReadFrom(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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log.Printf("Received UDP packet from %v: %s", remoteAddr, buffer[:n])
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// 解析 UDP 数据
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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 UDP message: %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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if udpAddr, ok := remoteAddr.(*net.UDPAddr); ok {
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ip := udpAddr.IP.String()
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udpMsg.IP = ip
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if udpMsg.Type == "heartbeat" {
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UpdateUserStatus(udpMsg.IP, udpMsg.Hostname)
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continue
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}
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if udpMsg.Type == "file" {
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ReceiveFile(udpMsg)
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continue
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}
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// 添加消息到 UserMessages
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AddMessage(udpMsg)
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} else {
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log.Printf("unexpected address type: %T", remoteAddr)
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}
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}
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}
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func ClearAllUserMessages() {
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for ip, msg := range UserMessages {
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msg.Messages = []UdpMessage{} // 清空切片
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UserMessages[ip] = msg // 更新映射中的值
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}
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}
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func GetMessages() UserMessage {
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return UserMessage{
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Messages: UserMessages,
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Onlines: OnlineUsers,
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}
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}
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func AddMessage(msg UdpMessage) {
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if _, ok := UserMessages[msg.IP]; !ok {
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UserMessages[msg.IP] = &Messages{}
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}
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UserMessages[msg.IP].Messages = append(UserMessages[msg.IP].Messages, msg)
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}
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