gf-demo/internal/logic/chat/chat.go

package chat

import (
	"context"
	"log"
	"net/http"
	"sync"

	"github.com/gogf/gf/v2/net/ghttp"
	"github.com/gorilla/websocket"

	v1 "cris/api/chat/v1"
)

// 维护 WebSocket 客户端连接池
var clients = make(map[*websocket.Conn]bool)
var broadcast = make(chan string) // 广播消息的通道
var mu sync.Mutex                 //互斥锁

type chat struct{}

func New() *chat {
	return &chat{}
}

func (s *chat) Chat(ctx context.Context, r *ghttp.Request, req *v1.ChatReq) {

	// 升级 HTTP 请求为 WebSocket
	upgrader := websocket.Upgrader{
		CheckOrigin: func(r *http.Request) bool {
			return true
		},
		ReadBufferSize:  1024,
		WriteBufferSize: 1024,
	}

	// 建立 WebSocket 连接
	conn, err := upgrader.Upgrade(r.Response.Writer, r.Request, nil)
	if err != nil {
		log.Println("WebSocket upgrade failed:", err)
		return
	}

	// 将新连接加入到连接池
	mu.Lock()
	clients[conn] = true
	mu.Unlock()

	//销毁
	defer func() {
		mu.Lock()
		delete(clients, conn)
		mu.Unlock()
		conn.Close()
	}()

	for {
		_, msg, err := conn.ReadMessage()
		if err != nil {
			log.Println("Error reading message:", err)
			break
		}
		broadcast <- string(msg)
	}

}

// 广播消息
func handleBroadcast() {
	for {
		msg := <-broadcast
		mu.Lock()
		for client := range clients {
			err := client.WriteMessage(websocket.TextMessage, []byte(msg))
			if err != nil {
				log.Println("Error writing message:", err)
				client.Close()
				delete(clients, client)
			}
		}
		mu.Unlock()
	}
}

// 启动广播处理 goroutine
func init() {
	go handleBroadcast()
}