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package localchat
import (
"encoding/json"
"godo/libs"
"log"
"net"
"strings"
"time"
)
type UdpMessage struct {
Hostname string `json:"hostname"`
Type string `json:"type"`
Time time.Time `json:"time"`
IP string `json:"ip"`
Message any `json:"message"`
}
type UdpAddress struct {
Hostname string `json:"hostname"`
IP string `json:"ip"`
Time time.Time `json:"time"`
}
type Messages struct {
Messages []UdpMessage `json:"messages"`
}
type UserMessage struct {
Messages map[string]*Messages `json:"messages"`
Onlines []UdpAddress `json:"onlines"`
}
var OnlineUsers []UdpAddress
var UserMessages = make(map[string]*Messages) // 使用指针类型
func init() {
go InitBroadcast()
go ListenForBroadcast()
}
// ListenForBroadcast 监听多播消息
func ListenForBroadcast() {
broadcastAddr := GetBroadcastAddr()
addr, err := net.ResolveUDPAddr("udp4", broadcastAddr)
if err != nil {
log.Fatalf("Failed to resolve UDP address: %v", err)
}
// 使用 ListenMulticastUDP 创建多播连接
conn, err := net.ListenMulticastUDP("udp4", nil, addr)
if err != nil {
log.Fatalf("Failed to listen on UDP address: %v", err)
}
defer conn.Close()
// 获取本地 IP 地址
ips, err := libs.GetValidIPAddresses()
if err != nil {
log.Fatalf("Failed to get local IP addresses: %v", err)
}
// 开始监听多播消息
buffer := make([]byte, 1024)
for {
n, remoteAddr, err := conn.ReadFromUDP(buffer)
if err != nil {
log.Printf("Error reading from UDP: %v", err)
continue
}
var udpMsg UdpMessage
err = json.Unmarshal(buffer[:n], &udpMsg)
if err != nil {
log.Printf("Error unmarshalling JSON: %v", err)
continue
}
// 从 remoteAddr 获取 IP 地址
ip := remoteAddr.IP.String()
if containArr(ips, ip) {
continue
}
if udpMsg.Type == "online" {
if !containIp(OnlineUsers, ip) {
OnlineUsers = append(OnlineUsers, UdpAddress{Hostname: udpMsg.Hostname, IP: ip, Time: time.Now()})
log.Printf("在线用户: %v", OnlineUsers)
}
}
udpMsg.IP = ip
if udpMsg.Type == "text" {
addMessageToUserMessages(ip, udpMsg)
}
if udpMsg.Type == "file" {
addMessageToUserMessages(ip, udpMsg)
RecieveFile(udpMsg)
}
log.Printf("Received message from %s: %s", remoteAddr, udpMsg.Hostname)
}
}
func containArr(s []string, str string) bool {
for _, v := range s {
if v == str {
return true
}
}
return false
}
func containIp(slice []UdpAddress, element string) bool {
for _, v := range slice {
if v.IP == element {
return true
}
}
return false
}
// 添加消息到 UserMessages
func addMessageToUserMessages(ip string, msg UdpMessage) {
if _, ok := UserMessages[ip]; !ok {
UserMessages[ip] = &Messages{}
}
UserMessages[ip].Messages = append(UserMessages[ip].Messages, msg)
}
// 清空 UserMessages 中所有 IP 的消息列表
func ClearAllUserMessages() {
for ip, msg := range UserMessages {
msg.Messages = []UdpMessage{} // 清空切片
UserMessages[ip] = msg // 更新映射中的值
}
}
func GetMessages() UserMessage {
return UserMessage{
Messages: UserMessages,
Onlines: OnlineUsers,
}
}
func GetBroadcastAddr() string {
return libs.GetUdpAddr()
}
func GetBroadcastPort() string {
addr := GetBroadcastAddr()
return addr[strings.LastIndex(addr, ":")+1:]
}