mirror of
https://github.com/MatrixSeven/file-transfer-go.git
synced 2026-02-15 09:44:45 +08:00
398 lines
9.9 KiB
Go
398 lines
9.9 KiB
Go
package services
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import (
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"fmt"
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"log"
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"math/rand"
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"net/http"
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"sync"
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"time"
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"github.com/gorilla/websocket"
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)
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type WebRTCService struct {
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rooms map[string]*WebRTCRoom
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roomsMux sync.RWMutex
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upgrader websocket.Upgrader
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}
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type WebRTCRoom struct {
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Code string
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Sender *WebRTCClient
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Receiver *WebRTCClient
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CreatedAt time.Time
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ExpiresAt time.Time // 添加过期时间
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LastOffer *WebRTCMessage // 保存最后的offer消息
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}
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type WebRTCClient struct {
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ID string
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Role string // "sender" or "receiver"
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Connection *websocket.Conn
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Room string
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}
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func NewWebRTCService() *WebRTCService {
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service := &WebRTCService{
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rooms: make(map[string]*WebRTCRoom),
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roomsMux: sync.RWMutex{},
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upgrader: websocket.Upgrader{
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CheckOrigin: func(r *http.Request) bool {
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return true // 允许所有来源，生产环境应当限制
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},
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},
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}
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// 启动房间清理任务
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go service.cleanupExpiredRooms()
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return service
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}
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type WebRTCMessage struct {
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Type string `json:"type"`
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From string `json:"from"`
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To string `json:"to"`
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Payload interface{} `json:"payload"`
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}
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// HandleWebSocket 处理WebRTC信令WebSocket连接
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func (ws *WebRTCService) HandleWebSocket(w http.ResponseWriter, r *http.Request) {
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log.Printf("收到WebRTC WebSocket连接请求: %s", r.URL.String())
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conn, err := ws.upgrader.Upgrade(w, r, nil)
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if err != nil {
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log.Printf("WebRTC WebSocket升级失败: %v", err)
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return
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}
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defer conn.Close()
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// 获取房间码和角色
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code := r.URL.Query().Get("code")
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role := r.URL.Query().Get("role")
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log.Printf("WebRTC连接参数: code=%s, role=%s", code, role)
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if code == "" || (role != "sender" && role != "receiver") {
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log.Printf("WebRTC连接参数无效: code=%s, role=%s", code, role)
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conn.WriteJSON(map[string]interface{}{
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"type": "error",
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"message": "连接参数无效",
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})
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return
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}
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// 验证房间是否存在
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ws.roomsMux.RLock()
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room := ws.rooms[code]
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ws.roomsMux.RUnlock()
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if room == nil {
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log.Printf("房间不存在: %s", code)
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conn.WriteJSON(map[string]interface{}{
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"type": "error",
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"message": "房间不存在或已过期",
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})
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return
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}
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// 检查房间是否已过期
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if time.Now().After(room.ExpiresAt) {
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log.Printf("房间已过期: %s", code)
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conn.WriteJSON(map[string]interface{}{
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"type": "error",
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"message": "房间已过期",
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})
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return
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}
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// 生成客户端ID
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clientID := ws.generateClientID()
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client := &WebRTCClient{
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ID: clientID,
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Role: role,
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Connection: conn,
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Room: code,
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}
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log.Printf("WebRTC客户端已创建: ID=%s, Role=%s, Room=%s", clientID, role, code)
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// 添加客户端到房间
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ws.addClientToRoom(code, client)
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log.Printf("WebRTC %s连接到房间: %s (客户端ID: %s)", role, code, clientID)
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// 连接关闭时清理
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defer func() {
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ws.removeClientFromRoom(code, clientID)
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log.Printf("WebRTC客户端断开连接: %s (房间: %s)", clientID, code)
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// 通知房间内其他客户端对方已断开连接
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ws.notifyRoomDisconnection(code, clientID, client.Role)
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}()
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// 处理消息
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for {
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var msg WebRTCMessage
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err := conn.ReadJSON(&msg)
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if err != nil {
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log.Printf("读取WebRTC WebSocket消息失败: %v", err)
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break
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}
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msg.From = clientID
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log.Printf("收到WebRTC信令: 类型=%s, 来自=%s, 房间=%s", msg.Type, clientID, code)
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// 转发信令消息给对方
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ws.forwardMessage(code, clientID, &msg)
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}
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}
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// 添加客户端到房间
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func (ws *WebRTCService) addClientToRoom(code string, client *WebRTCClient) {
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ws.roomsMux.Lock()
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defer ws.roomsMux.Unlock()
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room := ws.rooms[code]
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if room == nil {
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log.Printf("尝试加入不存在的WebRTC房间: %s", code)
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return
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}
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if client.Role == "sender" {
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room.Sender = client
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// 如果发送方连接，检查是否有接收方在等待，通知接收方
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if room.Receiver != nil {
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log.Printf("通知接收方：发送方已连接")
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peerJoinedMsg := &WebRTCMessage{
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Type: "peer-joined",
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From: client.ID,
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Payload: map[string]interface{}{
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"role": "sender",
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},
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}
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room.Receiver.Connection.WriteJSON(peerJoinedMsg)
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}
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} else {
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room.Receiver = client
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// 如果接收方连接，通知发送方可以开始建立P2P连接
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if room.Sender != nil {
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log.Printf("通知发送方：接收方已连接，可以开始建立P2P连接")
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peerJoinedMsg := &WebRTCMessage{
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Type: "peer-joined",
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From: client.ID,
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Payload: map[string]interface{}{
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"role": "receiver",
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},
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}
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room.Sender.Connection.WriteJSON(peerJoinedMsg)
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}
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// 如果接收方连接，且有保存的offer，立即发送给接收方
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if room.LastOffer != nil {
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log.Printf("向新连接的接收方发送保存的offer")
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err := client.Connection.WriteJSON(room.LastOffer)
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if err != nil {
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log.Printf("发送保存的offer失败: %v", err)
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}
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}
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}
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}
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// 从房间移除客户端
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func (ws *WebRTCService) removeClientFromRoom(code string, clientID string) {
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ws.roomsMux.Lock()
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defer ws.roomsMux.Unlock()
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room := ws.rooms[code]
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if room == nil {
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return
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}
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if room.Sender != nil && room.Sender.ID == clientID {
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room.Sender = nil
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}
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if room.Receiver != nil && room.Receiver.ID == clientID {
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room.Receiver = nil
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}
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// 如果房间为空，删除房间
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if room.Sender == nil && room.Receiver == nil {
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delete(ws.rooms, code)
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log.Printf("清理WebRTC房间: %s", code)
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}
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}
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// 转发信令消息
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func (ws *WebRTCService) forwardMessage(roomCode string, fromClientID string, msg *WebRTCMessage) {
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ws.roomsMux.Lock()
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defer ws.roomsMux.Unlock()
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room := ws.rooms[roomCode]
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if room == nil {
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return
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}
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// 如果是offer消息，保存起来
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if msg.Type == "offer" {
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room.LastOffer = msg
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log.Printf("保存offer消息，等待接收方连接")
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}
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var targetClient *WebRTCClient
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if room.Sender != nil && room.Sender.ID == fromClientID {
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// 消息来自sender，转发给receiver
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targetClient = room.Receiver
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} else if room.Receiver != nil && room.Receiver.ID == fromClientID {
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// 消息来自receiver，转发给sender
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targetClient = room.Sender
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}
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if targetClient != nil && targetClient.Connection != nil {
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msg.To = targetClient.ID
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err := targetClient.Connection.WriteJSON(msg)
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if err != nil {
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log.Printf("转发WebRTC信令失败: %v", err)
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} else {
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log.Printf("转发WebRTC信令: 类型=%s, 从=%s到=%s", msg.Type, fromClientID, targetClient.ID)
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}
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} else {
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log.Printf("目标客户端不在线，消息类型=%s", msg.Type)
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}
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}
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// CreateRoom 创建或获取房间
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func (ws *WebRTCService) CreateRoom(code string) {
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ws.roomsMux.Lock()
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defer ws.roomsMux.Unlock()
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if _, exists := ws.rooms[code]; !exists {
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ws.rooms[code] = &WebRTCRoom{
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Code: code,
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CreatedAt: time.Now(),
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ExpiresAt: time.Now().Add(time.Hour), // 1小时后过期
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}
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log.Printf("创建WebRTC房间: %s", code)
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}
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}
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// CreateNewRoom 创建新房间并返回房间码 - 确保不重复
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func (ws *WebRTCService) CreateNewRoom() string {
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var code string
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// 生成唯一房间码，确保不重复
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for {
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code = ws.generatePickupCode()
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ws.roomsMux.RLock()
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_, exists := ws.rooms[code]
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ws.roomsMux.RUnlock()
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if !exists {
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break // 找到了不重复的代码
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}
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// 如果重复了，继续生成新的
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}
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ws.CreateRoom(code)
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return code
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}
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// generatePickupCode 生成6位取件码 - 统一规则：只使用大写字母和数字，排除0和O避免混淆
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func (ws *WebRTCService) generatePickupCode() string {
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// 只使用大写字母和数字，排除容易混淆的字符：数字0和字母O
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chars := "123456789ABCDEFGHIJKLMNPQRSTUVWXYZ"
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source := rand.NewSource(time.Now().UnixNano())
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rng := rand.New(source)
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result := make([]byte, 6)
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for i := 0; i < 6; i++ {
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result[i] = chars[rng.Intn(len(chars))]
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}
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return string(result)
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}
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// cleanupExpiredRooms 定期清理过期房间
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func (ws *WebRTCService) cleanupExpiredRooms() {
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ticker := time.NewTicker(5 * time.Minute)
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defer ticker.Stop()
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for range ticker.C {
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ws.roomsMux.Lock()
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now := time.Now()
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for code, room := range ws.rooms {
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// 房间过期或无客户端连接则删除
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if now.After(room.ExpiresAt) || (room.Sender == nil && room.Receiver == nil) {
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delete(ws.rooms, code)
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log.Printf("清理过期WebRTC房间: %s", code)
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}
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}
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ws.roomsMux.Unlock()
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}
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}
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// generateClientID 生成客户端ID
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func (ws *WebRTCService) generateClientID() string {
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return fmt.Sprintf("webrtc_client_%d", rand.Int63())
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}
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// 通知房间内客户端有人断开连接
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func (ws *WebRTCService) notifyRoomDisconnection(roomCode string, disconnectedClientID string, disconnectedRole string) {
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ws.roomsMux.Lock()
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defer ws.roomsMux.Unlock()
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room := ws.rooms[roomCode]
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if room == nil {
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return
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}
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// 构建断开连接通知消息
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disconnectionMsg := &WebRTCMessage{
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Type: "disconnection",
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From: disconnectedClientID,
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Payload: map[string]interface{}{
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"role": disconnectedRole,
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"message": "对方已停止传输",
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},
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}
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// 通知房间内其他客户端
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if room.Sender != nil && room.Sender.ID != disconnectedClientID {
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err := room.Sender.Connection.WriteJSON(disconnectionMsg)
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if err != nil {
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log.Printf("通知发送方断开连接失败: %v", err)
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} else {
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log.Printf("已通知发送方: 对方已断开连接")
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}
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}
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if room.Receiver != nil && room.Receiver.ID != disconnectedClientID {
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err := room.Receiver.Connection.WriteJSON(disconnectionMsg)
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if err != nil {
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log.Printf("通知接收方断开连接失败: %v", err)
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} else {
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log.Printf("已通知接收方: 对方已断开连接")
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}
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}
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}
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func (ws *WebRTCService) GetRoomStatus(code string) map[string]interface{} {
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ws.roomsMux.RLock()
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defer ws.roomsMux.RUnlock()
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room := ws.rooms[code]
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if room == nil {
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return map[string]interface{}{
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"success": false,
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"exists": false,
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"message": "房间不存在或已过期",
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}
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}
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return map[string]interface{}{
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"success": true,
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"exists": true,
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"sender_online": room.Sender != nil,
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"receiver_online": room.Receiver != nil,
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"created_at": room.CreatedAt,
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}
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}
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