flask_socketio 用法：

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/jacke121/article/details/83685477

socket.io不能同时建多个：

启动必须：socketio.run(app, debug=False,host = '0.0.0.0', port = 5000)

init_app不管用，不知道干嘛的：会报gevent的猴子错误

#!/usr/bin/env python
from threading import Lock
from flask import Flask, render_template, session, request
from flask_socketio import SocketIO, emit, join_room, leave_room, \
    close_room, rooms, disconnect

# Set this variable to "threading", "eventlet" or "gevent" to test the
# different async modes, or leave it set to None for the application to choose
# the best option based on installed packages.
async_mode = None

app = Flask(__name__)
app.config['SECRET_KEY'] = 'secret!'
socketio = SocketIO(app, async_mode=async_mode)
thread = None
thread_lock = Lock()


def background_thread():
    """Example of how to send server generated events to clients."""
    count = 0
    while True:
        socketio.sleep(1)
        count += 1
        socketio.emit('my_response',
                      {'data': 'Server generated event', 'count': count},
                      namespace='/test')


@app.route('/')
def index():
    return render_template('index.html', async_mode=socketio.async_mode)


@socketio.on('my_event', namespace='/test')
def test_message(message):
    session['receive_count'] = session.get('receive_count', 0) + 1
    emit('my_response',
         {'data': message['data'], 'count': session['receive_count']})

print("################################")
@socketio.on('my_broadcast_event', namespace='/test')
def test_broadcast_message(message):
    session['receive_count'] = session.get('receive_count', 0) + 1
    emit('my_response',
         {'data': message['data'], 'count': session['receive_count']},
         broadcast=True)


@socketio.on('join', namespace='/test')
def join(message):
    join_room(message['room'])
    session['receive_count'] = session.get('receive_count', 0) + 1
    emit('my_response',
         {'data': 'In rooms: ' + ', '.join(rooms()),
          'count': session['receive_count']})


@socketio.on('leave', namespace='/test')
def leave(message):
    leave_room(message['room'])
    session['receive_count'] = session.get('receive_count', 0) + 1
    emit('my_response',
         {'data': 'In rooms: ' + ', '.join(rooms()),
          'count': session['receive_count']})


@socketio.on('close_room', namespace='/test')
def close(message):
    session['receive_count'] = session.get('receive_count', 0) + 1
    emit('my_response', {'data': 'Room ' + message['room'] + ' is closing.',
                         'count': session['receive_count']},
         room=message['room'])
    close_room(message['room'])


@socketio.on('my_room_event', namespace='/test')
def send_room_message(message):
    session['receive_count'] = session.get('receive_count', 0) + 1
    emit('my_response',
         {'data': message['data'], 'count': session['receive_count']},
         room=message['room'])


@socketio.on('disconnect_request', namespace='/test')
def disconnect_request():
    session['receive_count'] = session.get('receive_count', 0) + 1
    emit('my_response',
         {'data': 'Disconnected!', 'count': session['receive_count']})
    disconnect()


@socketio.on('my_ping', namespace='/test')
def ping_pong():
    emit('my_pong')


@socketio.on('connect', namespace='/test')
def test_connect():
    print("connect")
    global thread
    with thread_lock:
        if thread is None:
            thread = socketio.start_background_task(target=background_thread)
    emit('my_response', {'data': 'Connected', 'count': 0})


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


if __name__ == '__main__':
  
    socketio.run(app, debug=False,host = '0.0.0.0', port = 5000)

// var socket = io.connect(location.origin + '/warn/',
 var socket = io.connect( 'http://127.0.0.1:9000/warn/',
    {
        'sync disconnect on unload': true
        // 'transports': ['websocket']
    });
    socket.on('connect', function() {
        alert("conn");
    socket.emit('alive', {
        data: 'ok'
    });
});
socket.on('join', function(response) {
    if (response.success) {
        displayWarningData(response);
    } else {
        socket.disconnect();
    }
});
socket.on('message', function(msg) {
    displayWarningData(msg);
});