Websocket Flask Gevent pb affichage

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Auteur du sujet

Salut, j’ai trouvé un tuto sympa mais qui ne marche pas :( https://www.shanelynn.ie/asynchronous-updates-to-a-webpage-with-flask-and-socket-io/

l' objectif est d' afficher une valeur aléatoire dynamique sur une page web. De plus, dans l' idéal une seule valeur serait affichée (l’exemple déballe une liste chronologique là où il ne faudrait que la dernière valeur actualisée).

autre lecture tres sympa pour ceux que ça interesse : http://blog.dataroadtech.com/asynchronous-task-execution-with-flask-celery-and-socketio/

mon code rafistolé actuel: monscript.py

from flask_socketio import SocketIO, emit
from flask import Flask, render_template, url_for, copy_current_request_context
from random import random
from time import sleep
from threading import Thread, Event

import gevent
from gevent import monkey
monkey.patch_all()


__author__ = 'slynn'

app = Flask(__name__)
app.config['SECRET_KEY'] = 'secret!'
app.config['DEBUG'] = True

#turn the flask app into a socketio app
socketio = SocketIO(app, async_mode='gevent')


#random number Generator Thread
thread = Thread()
thread_stop_event = Event()

class RandomThread(Thread):
    def __init__(self):
        self.delay = 1
        super(RandomThread, self).__init__()

    def randomNumberGenerator(self):
        """
        Generate a random number every 1 second and emit to a socketio instance (broadcast)
        Ideally to be run in a separate thread?
        """
        #infinite loop of magical random numbers
        print("Making random numbers")
        while not thread_stop_event.isSet():
            number = round(random()*10, 3)
            print(number)
            socketio.emit('newnumber', {'number': number}, namespace='/test')
            sleep(self.delay)

    def run(self):
        self.randomNumberGenerator()


@app.route('/')
def index():
    #only by sending this page first will the client be connected to the socketio instance
    return render_template('index.html')

@socketio.on('connect', namespace='/test')
def test_connect():
    # need visibility of the global thread object
    global thread
    print('Client connected')

    #Start the random number generator thread only if the thread has not been started before.
    if not thread.isAlive():
        print("Starting Thread")
        thread = RandomThread()
        thread.start()

@socketio.on('disconnect', namespace='/test')
def test_disconnect():
    print('Client disconnected')


if __name__ == '__main__':
    socketio.run(app)

index.html

<!DOCTYPE html>
<html>
<head>
    <script src="//code.jquery.com/jquery-3.3.1.min.js"></script>
    <script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/socket.io/1.3.6/socket.io.min.js"></script>
    <script src="static/js/application.js"></script>

    <link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
</head>
<body>
<div class="container">
  <div class="jumbotron">
    <h1>Asynchronous Flask Communication</h1>
    <p>Random numbers generated by the Flask server will appear below, asynchronously.</p>
    <p>Details <a href='https://www.shanelynn.ie/asynchronous-updates-to-a-webpage-with-flask-and-socket-io/' target='_blank'>here.</a></p>
  </div>
</div>
    
</div>

<div class="container" id="content">
    <div class="row">
        <p>Asynchronous page updates will appear here:</p>
        <h3>Number list:</h3>
        <div id="log">
        </div> <!-- /#log -->
    </div>
</div>


</body>
</html>

application.js

$(document).ready(function(){
    //connect to the socket server.
    var socket = io.connect('http://' + document.domain + ':' + location.port + '/test');
    var numbers_received = [];

    //receive details from server
    socket.on('newnumber', function(msg) {
        console.log("Received number" + msg.number);
        //maintain a list of ten numbers
        if (numbers_received.length >= 10){
            numbers_received.shift()
        }            
        numbers_received.push(msg.number);
        numbers_string = '';
        for (var i = 0; i < numbers_received.length; i++){
            numbers_string = numbers_string + '<p>' + numbers_received[i].toString() + '</p>';
        }
        $('#log').html(numbers_string);
    });

});
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