I am creating an Flask-socketio app, in which I want to send socket when an OSC message is received, in order to receive it into a web app thanks to socketio.js
from flask import Flask, render_template, copy_current_request_context, current_app
from flask_socketio import SocketIO, emit, send
from OSC import OSCClient, OSCMessage, OSCServer
import time, threading
app = Flask(__name__)
socketio = SocketIO(app)
client = OSCClient()
client.connect( ("localhost", 62345))
receive_address = ('localhost', 62346)
server = OSCServer(receive_address)
# simple callback functions
def answer_handler(addr, tags, stuff, source):
with app.app_context():
socketio.emit('tempo', 1)
# adding callback functions to listener
server.addMsgHandler("/puredata", answer_handler)
if __name__ == '__main__':
#Start OSCServer in extra thread
st = threading.Thread( target = server.serve_forever )
st.daemon = True
st.start()
print('OSC server is started')
socketio.run(app, host='0.0.0.0')
Even if I don't get error message, the socket is not receive from the javascript side, because the emit function is called in another thread, and there is conflicts with the request context.
I tried several things according to some other stackoverflow tickets :
socketio = SocketIO(app, async_mode='threading')
Adding this line before handler function
@copy_current_request_context
Or recreate a socketio instance into the callback
def answer_handler(addr, tags, stuff, source):
socketio_connection = SocketIO(app)
with app.app_context():
socketio_connection.emit('tempo', 1)
But none of these solution is working, and I need to integrate solve this 'context' problem into my thread. Note that :
socketio.emit('tempo', 1)
is working great out of this thread , and received in the javascript part
