feat: 完善后端脚手架基础能力

modules/ws/controller.go

@@ -0,0 +1,66 @@
+package ws
+
+import (
+	"crypto/rand"
+	"encoding/hex"
+	"net/http"
+	"strings"
+	"time"
+
+	"github.com/gin-gonic/gin"
+	"github.com/gorilla/websocket"
+	"go.uber.org/zap"
+)
+
+type Controller struct {
+	hub      *Hub
+	upgrader websocket.Upgrader
+}
+
+func NewController(hub *Hub) *Controller {
+	return &Controller{
+		hub: hub,
+		upgrader: websocket.Upgrader{
+			ReadBufferSize:  1024,
+			WriteBufferSize: 1024,
+		},
+	}
+}
+
+// Connect 升级 HTTP 连接并加入指定房间。
+// 浏览器连接示例：new WebSocket("ws://localhost:8080/api/ws?room=lobby&client_id=demo")
+func (c *Controller) Connect(ctx *gin.Context) {
+	room := strings.TrimSpace(ctx.DefaultQuery("room", "lobby"))
+	clientID := strings.TrimSpace(ctx.Query("client_id"))
+	if room == "" || len(room) > 64 || len(clientID) > 64 {
+		ctx.JSON(http.StatusBadRequest, gin.H{"code": 400, "message": "room 或 client_id 不合法", "data": nil})
+		return
+	}
+	if clientID == "" {
+		clientID = randomClientID()
+	}
+
+	conn, err := c.upgrader.Upgrade(ctx.Writer, ctx.Request, nil)
+	if err != nil {
+		zap.L().Warn("WebSocket升级失败", zap.Error(err))
+		return
+	}
+	client := NewClient(c.hub, conn, room, clientID)
+	online := c.hub.Register(client)
+	client.send <- OutgoingMessage{
+		Type: EventWelcome, Room: room, ClientID: clientID,
+		Data: "connected", Online: online, Timestamp: time.Now(),
+	}
+	c.hub.Broadcast(room, presenceMessage(room, clientID, "joined", online))
+
+	go client.WritePump()
+	client.ReadPump()
+}
+
+func randomClientID() string {
+	value := make([]byte, 8)
+	if _, err := rand.Read(value); err != nil {
+		return "anonymous"
+	}
+	return hex.EncodeToString(value)
+}