/
main.go
70 lines (63 loc) · 1.42 KB
/
main.go
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package main
import (
"log"
"net/http"
"time"
"github.com/gorilla/websocket"
)
var clients = make(map[*websocket.Conn]bool)
var broadcast = make(chan Message)
var upgrader = websocket.Upgrader{}
type Message struct {
Message string `json:"message"`
}
func main() {
fs := http.FileServer(http.Dir("public"))
http.Handle("/", fs)
http.HandleFunc("/ws", handleConnections)
go handleMessages()
log.Println("http server started on :8000")
err := http.ListenAndServe(":8000", nil)
if err != nil {
log.Fatal("ListenAndServe: ", err)
}
}
//注册成为 websocket
func handleConnections(w http.ResponseWriter, r *http.Request) {
ws, err := upgrader.Upgrade(w, r, nil)
if err != nil {
log.Fatal(err)
}
defer ws.Close()
clients[ws] = true
//不断的从页面上获取数据 然后广播发送出去
for {
// 发送数据
time.Sleep(time.Second * 3)
msg := Message{Message: "这是向页面发送的数据 " + time.Now().Format("2006-01-02 15:04:05")}
broadcast <- msg
// 接收数据
var msgRecv Message
err := ws.ReadJSON(&msgRecv)
if err != nil {
log.Printf("error: %v", err)
delete(clients, ws)
break
}
log.Println(msgRecv)
}
}
//广播发送至页面
func handleMessages() {
for {
msg := <-broadcast
for client := range clients {
err := client.WriteJSON(msg)
if err != nil {
log.Printf("client.WriteJSON error: %v", err)
client.Close()
delete(clients, client)
}
}
}
}