Flask-socketio Server communication problem #1609

Mohamad108 · 2021-05-09T15:14:10Z

Mohamad108
May 9, 2021

hi
i 'm from Iran

i run my project on the system, it works fine, send and receive messages to the server
But
When I deploy within the site. The server response is incorrect,
The server always sends the message socket.on ('connect')
Thanks for your help

requirements:

          Flask==1.1.2
          Flask-SocketIO==5.0.1
          Flask-Session==0.3.2
          gunicorn==20.1.0
          eventlet==0.31.0

app.py:

    from flask import Flask, render_template, request, redirect, url_for, session
    from flask_socketio import SocketIO, join_room, leave_room, emit
    #from flask_Sesstion import Session
    import eventlet
    eventlet.monkey_patch()
    
    app = Flask(__name__)
    app.debug = True
    app.config['SECRET_KEY'] = 'secret'
    app.config['SESSION_TYPE'] = 'filesystem'
    #Session(app)
    TempUser = []
    TempRoom = []
    
    socket = SocketIO(app, manage_session=False)
    
    @app.route('/', methods=['GET', 'POST'])
    def index():
        return render_template('index.html')
    
    @app.route('/chat', methods=['GET', 'POST'])
    def chat():
        if(request.method=='POST'):
            username = request.form['username']
            room = request.form['room']
            #Store the data in session
            session['username'] = username
            session['room'] = room
            return render_template('chat.html', session = session)
        else:
            if(session.get('username') is not None):
                return render_template('chat.html', session = session)
            else:
                return redirect(url_for('index'))
    
    @socket.on('join',namespace='/chat')
    def join(message):
        room = session.get('room')
        join_room(room)
        emit('status', {'msg': session.get('username') +' has entered the room.'}, room=room)
    
    @socket.on('text',namespace='/chat')
    def text(message):
        room = session.get('room')
        emit('message', {'msg': session.get('username') + ' : ' + message['msg']}, room=room)
    
    @socket.on('left',namespace='/chat')
    def left(message):
        room = session.get('room')
        username = session.get('username')
        leave_room(room)
        session.clear()
        emit('status', {'msg': username + ' has left the room.'}, room=room)
    
    if __name__ == '__main__':
        app.run()

chat.html:

    <!DOCTYPE html>
    <html lang="en">
      <head>
        <title>Penguin Coders Chat</title>
        <!--Link to CSS -->
        <link href="../static/bootstrap.min.css" rel="stylesheet" />
        <link href="../static/style.css" rel="stylesheet" />
        <script type="text/javascript" src="//code.jquery.com/jquery-3.2.1.slim.min.js"></script>
        <script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/socket.io/3.0.3/socket.io.min.js"></script>
        <script type="text/javascript" charset="utf-8">
            var socket;
            $(document).ready(function(){
                socket = io.connect('http://'+document.domain + ':' + location.port +'/chat');
                socket.on('connect', function() {
                    socket.emit('join', {});
                });
                socket.on('status', function(data) {
                    $('#chat').val($('#chat').val() + '<' + data.msg + '>\n');
                    $('#chat').scrollTop($('#chat')[0].scrollHeight);
                });
                socket.on('message', function(data) {
                    $('#chat').val($('#chat').val() + data.msg + '\n');
                    $('#chat').scrollTop($('#chat')[0].scrollHeight);
                });
                $('#send').click(function(e) {
                    text = $('#text').val();
                    $('#text').val('');
                    socket.emit('text',{'msg': text});
    
                });
            });
            function leave_room() {
                socket.emit('left',{},function() {
                    socket.disconnect();
                    window.location.href = "{{url_for('index')}}";
                });
            }
        </script>
      </head>
      <body class="text-center">
        <div class="chatwindow">
          <h2 >Penguin Coders Chat</h2>
          <h2>Room : {{session['room']}}</h2><br/>
          <textarea id="chat" cols="70" rows="10" placeholder="No messages yet. Start one..."></textarea><br/><br/>
          <input type="text" id="text" size="60" placeholder="Enter your message here" />
          <button type="button" id="send" class="btn btn-success">SEND</button><br/><br/>
          <center><button type="button"  class="btn btn-danger" onclick="leave_room()"> Leave this Chat </button></center>
        </div>
      </body>
    </html>

miguelgrinberg · 2021-05-09T17:45:32Z

miguelgrinberg
May 9, 2021
Maintainer

Please provide logs that show the problem. See the troubleshooting section of the documentation if you don't know how to enable the logs.

0 replies

Mohamad108 · 2021-05-09T19:19:16Z

Mohamad108
May 9, 2021
Author

logs

raise RuntimeError('You need to use the eventlet server. '
RuntimeError: You need to use the eventlet server. See the Deployment section of the documentation for more information.

Localhost:

if __name__ == '__main__':
  import eventlet
  import eventlet.wsgi
  eventlet.wsgi.server(eventlet.listen(('', 8000)), app)

but
How to use within the site??
How to set file passenger_wsgi??

0 replies

miguelgrinberg · 2021-05-09T21:58:14Z

miguelgrinberg
May 9, 2021
Maintainer

I don't know what you mean by passenger_wsgi. I assume this is a requirement of your deployment platform? You may need to ask them if they support eventlet.

0 replies

Mohamad108 · 2021-05-10T22:54:40Z

Mohamad108
May 10, 2021
Author

[ N 2021-05-10 20:24:20.8429 22254/T1 age/Cor/CoreMain.cpp:1117 ]: Checking whether to disconnect long-running connections for process 799, application /home/hironika/FlaskHironika (production)
[ N 2021-05-10 20:24:20.5406 22254/T1 age/Cor/CoreMain.cpp:1117 ]: Checking whether to disconnect long-running connections for process 799, application /home/hironika/FlaskHironika (production)
[ N 2021-05-10 17:24:18.4590 27247/T1 age/Cor/CoreMain.cpp:1117 ]: Checking whether to disconnect long-running connections for process 20640, application /home/hironika/FlaskHironika (production)
[ N 2021-05-10 17:24:18.2472 27247/T1 age/Cor/CoreMain.cpp:1117 ]: Checking whether to disconnect long-running connections for process 20640, application /home/hironika/FlaskHironika (production)

0 replies

miguelgrinberg · 2021-05-11T08:35:16Z

miguelgrinberg
May 11, 2021
Maintainer

I'm sorry, but I have no idea what you are showing me.

0 replies

bluthen · 2021-05-11T14:24:24Z

bluthen
May 11, 2021

I think those are from Apache. Perhaps apache wsgi set to have several workers, and it is checking if flask is still alive for each worker

0 replies

Mohamad108 · 2021-05-11T15:09:42Z

Mohamad108
May 11, 2021
Author

Not a problem of the program
This problem is solved when I run the program with socketio.run (app)
But when I transfer it to the host, it is executed by passenger_wsgi, which is dedicated to the host
I think the problem is with the setting of passenger_wsgi files

thank you very much

0 replies

miguelgrinberg · 2021-05-11T15:35:21Z

miguelgrinberg
May 11, 2021
Maintainer

What web server does this passenger_wsgi thing uses? You can't just use any web server, there are some requirements that many web servers (say Apache) do not have.

0 replies

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Flask-socketio Server communication problem #1609

Mohamad108 May 9, 2021

requirements:

app.py:

chat.html:

Replies: 8 comments

miguelgrinberg May 9, 2021 Maintainer

Mohamad108 May 9, 2021 Author

logs

Localhost:

miguelgrinberg May 9, 2021 Maintainer

Mohamad108 May 10, 2021 Author

miguelgrinberg May 11, 2021 Maintainer

bluthen May 11, 2021

Mohamad108 May 11, 2021 Author

miguelgrinberg May 11, 2021 Maintainer

Mohamad108
May 9, 2021

miguelgrinberg
May 9, 2021
Maintainer

Mohamad108
May 9, 2021
Author

miguelgrinberg
May 9, 2021
Maintainer

Mohamad108
May 10, 2021
Author

miguelgrinberg
May 11, 2021
Maintainer

bluthen
May 11, 2021

Mohamad108
May 11, 2021
Author

miguelgrinberg
May 11, 2021
Maintainer