forked from miguelgrinberg/Flask-SocketIO
/
app.py
119 lines (90 loc) · 3.33 KB
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app.py
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from threading import Lock
from flask import Flask, render_template, session, request, \
copy_current_request_context
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(10)
count += 1
socketio.emit('my_response',
{'data': 'Server generated event', 'count': count})
@app.route('/')
def index():
return render_template('index.html', async_mode=socketio.async_mode)
@socketio.event
def my_event(message):
session['receive_count'] = session.get('receive_count', 0) + 1
emit('my_response',
{'data': message['data'], 'count': session['receive_count']})
@socketio.event
def my_broadcast_event(message):
session['receive_count'] = session.get('receive_count', 0) + 1
emit('my_response',
{'data': message['data'], 'count': session['receive_count']},
broadcast=True)
@socketio.event
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.event
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')
def on_close_room(message):
session['receive_count'] = session.get('receive_count', 0) + 1
emit('my_response', {'data': 'Room ' + message['room'] + ' is closing.',
'count': session['receive_count']},
to=message['room'])
close_room(message['room'])
@socketio.event
def my_room_event(message):
session['receive_count'] = session.get('receive_count', 0) + 1
emit('my_response',
{'data': message['data'], 'count': session['receive_count']},
to=message['room'])
@socketio.event
def disconnect_request():
@copy_current_request_context
def can_disconnect():
disconnect()
session['receive_count'] = session.get('receive_count', 0) + 1
# for this emit we use a callback function
# when the callback function is invoked we know that the message has been
# received and it is safe to disconnect
emit('my_response',
{'data': 'Disconnected!', 'count': session['receive_count']},
callback=can_disconnect)
@socketio.event
def my_ping():
emit('my_pong')
@socketio.event
def connect():
global thread
with thread_lock:
if thread is None:
thread = socketio.start_background_task(background_thread)
emit('my_response', {'data': 'Connected', 'count': 0})
@socketio.on('disconnect')
def test_disconnect():
print('Client disconnected', request.sid)
if __name__ == '__main__':
socketio.run(app)