Question

我正在使用Flask开发基于房间的应用程序。通过SQL-Alchemy在Postgresql数据库中跟踪每个房间及其成员。用户是匿名的，因此是临时的：用户仅在房间里一直保留在数据库中。

在“正常”使用情况下，所有操作均按预期进行：通过url加入会议室或刷新页面一次或两次。但是，如果用户连续多次刷新页面（例如，向浏览器的刷新按钮发送垃圾邮件），则会出现问题。连接事件被正确触发，但是断开事件从未运行。结果，根据数据库仍然认为用户在房间里。这种不准确的数据会导致很多其他问题。为什么断开事件不触发，我能做些什么来解决此问题？

谢谢，迈克尔

代码在连接上运行：

@socketio.on('connect')
def add_to_room_and_sync_client():

    print('------------------------ user has connected!!!')
    print(request.sid)

    room = session['room_hash']

    # Add user to room
    join_room(room)
    RoomManager.join_room(room)

    # Broadcast connection to all users in room
    username = session['username']
    emit('statusUpdate', {'username':session['username'], 'status':'joining'}, room=room)

    # Get newly connected client up-to-date
    emit('sync', cache_manager.get_data_structures(session['room_hash']))

离开代码：

@socketio.on('disconnect')
def disconnect_user():
    print('user has disconnected!-------------------------')

    url = request.headers['Referer'] 
    room = url.split('/')[-1]

    leave_room(room)
    RoomManager.leave_room(room)

    username = session['username']
    emit('statusUpdate', {'username':session['username'], 'status':'leaving'}, room=room)

RoomManager的相关代码：

class RoomManager():
def join_room(hash_):
        room = Room.query.filter_by(id=hash_).first()

        # Add user to database if they do not exist.  Otherwise, select them from database
        user = User.query.filter_by(id=session['user_id']).first()
        if user == None:
            user = User(session['user_id'], session['username'])

        # Add user to room list. Also, if there is currently no owner, 
        # give this user ownership of the room
        room.users.append(user)

        if room.owner == None:
            room.owner = user

        db.session.commit()
def leave_room(hash_):
        room = Room.query.filter_by(id=hash_).first()
        user = User.query.filter_by(id=session['user_id']).first()


        # Remove user from room
        room.users.remove(user)

        # If this user was the owner, make someone else the owner
        if room.owner == user:
            print('he owns it')
            if len(room.users) == 0:
                room.owner = None
            else:
                room.owner = room.users[0]

        # If this is the only room the user is in, remove them from the database
        if len(user.rooms) == 0:
            db.session.delete(user)

        db.session.commit()

Socketio Rapid Refresh不会触发断开连接

0 个答案: