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package sys
import (
"encoding/json"
"fmt"
"godo/localchat"
"net/http"
"sync"
"time"
)
// 定义消息结构体
type Message struct {
Type string `json:"type"`
Data interface{} `json:"data"`
}
// 定义一个结构体来保存客户端连接
type client struct {
conn http.ResponseWriter
}
var clients = make(map[*client]bool)
var mutex sync.Mutex
// 处理客户端连接
func HandleSystemEvents(w http.ResponseWriter, r *http.Request) {
// 设置响应头
w.Header().Set("Content-Type", "text/event-stream")
w.Header().Set("Cache-Control", "no-cache")
w.Header().Set("Connection", "keep-alive")
// 创建客户端连接对象
c := &client{conn: w}
// 添加客户端到列表
mutex.Lock()
clients[c] = true
mutex.Unlock()
// 发送初始消息
updateInfo, err := GetUpdateInfo()
if err == nil {
SendToClient(c, Message{
Type: "update",
Data: updateInfo,
})
}
// 监听客户端关闭
defer func() {
mutex.Lock()
delete(clients, c)
mutex.Unlock()
}()
// 使用定时器轮询客户端请求
ticker := time.NewTicker(1 * time.Second)
defer ticker.Stop()
for range ticker.C {
// 检查客户端是否已断开连接
if r.Context().Err() != nil {
return
}
onlineUsers := localchat.GetOnlineUsers()
msg := Message{
Type: "localchat",
Data: onlineUsers,
}
Broadcast(msg)
}
}
// 向客户端发送消息
func SendToClient(c *client, msg Message) {
jsonMsg, err := json.Marshal(msg)
if err != nil {
fmt.Println("Error marshaling JSON:", err)
return
}
fmt.Fprintf(c.conn, "data: %s\n\n", jsonMsg)
c.conn.(http.Flusher).Flush()
}
// 广播消息给所有客户端
func Broadcast(msg Message) {
mutex.Lock()
defer mutex.Unlock()
for c := range clients {
SendToClient(c, msg)
}
}
// 每隔一段时间广播一条消息
func SendMessagePeriodically(msg Message) {
ticker := time.NewTicker(1 * time.Second)
for range ticker.C {
Broadcast(msg)
}
}