I have the following Flask app code:

def do_binance_trading(queue): 
    print("Going to start a socket. . .")
    socket_manager = BinanceSocketManager.getInstance() 
    socket_manager.startSocket(queue) 
    print("Socket started. . .")

@app.route("/") 
def main(): 
global process
global queue
global latestQueueData print("Ping app. . .")
if process is not None and process.is_alive():
    print("App is running. Trading process id:" + str(process.pid))    
    # Retrieve all data from the queue
    queue_data = []
    while not queue.empty():
        queue_data.append(queue.get())

    if len(queue_data) > 0 and latestQueueData != queue_data[-1]:
        latestQueueData = queue_data[-1]

    # Display all data in the queue
    return latestQueueData.replace("n", "<br>"), 200
else:
    print("Starting App. . .")
    queue = multiprocessing.Queue()
    process = multiprocessing.Process(target=do_binance_trading, args=(queue,))
    process.start()
    print("Process started. . .")
    return "Trading started", 200

if name == "main": 
    app.run()

The app is deployed to Azure Web Service. The logic is pretty much simple:

1. Run the app. The Process starts
2. On root refresh – get the stats from the queue for the process.

App is in general working fine, but from time to time, without any influence or logic, the process dies and I got the following Azure log trace:

2024-04-27T09:59:19.988977259Z Process Process-14:
2024-04-27T09:59:19.990693175Z Traceback (most recent call last):
2024-04-27T09:59:19.991752385Z   File "/opt/python/3.11.7/lib/python3.11/multiprocessing/process.py", line 314, in _bootstrap
2024-04-27T09:59:19.991789786Z     self.run()
2024-04-27T09:59:19.991796086Z   File "/opt/python/3.11.7/lib/python3.11/multiprocessing/process.py", line 108, in run
2024-04-27T09:59:19.991800386Z     self._target(*self._args, **self._kwargs)
2024-04-27T09:59:19.991824686Z   File "/tmp/8dc60406808a4da/app.py", line 29, in do_binance_trading
2024-04-27T09:59:19.991829486Z     socket_manager.startSocket(queue)
2024-04-27T09:59:19.991832986Z   File "/tmp/8dc60406808a4da/data/binance_data_socket.py", line 73, in startSocket
2024-04-27T09:59:19.991837086Z     rel.dispatch()
2024-04-27T09:59:19.991840786Z   File "/tmp/8dc60406808a4da/antenv/lib/python3.11/site-packages/rel/rel.py", line 228, in dispatch
2024-04-27T09:59:19.991844886Z     registrar.dispatch()
2024-04-27T09:59:19.991849086Z   File "/tmp/8dc60406808a4da/antenv/lib/python3.11/site-packages/rel/registrar.py", line 126, in dispatch
2024-04-27T09:59:19.991852986Z     if not self.loop():
2024-04-27T09:59:19.991857186Z            ^^^^^^^^^^^
2024-04-27T09:59:19.991861086Z   File "/tmp/8dc60406808a4da/antenv/lib/python3.11/site-packages/rel/registrar.py", line 135, in loop
2024-04-27T09:59:19.991864786Z     e = self.check_events()
2024-04-27T09:59:19.991868786Z         ^^^^^^^^^^^^^^^^^^^
2024-04-27T09:59:19.991872386Z   File "/tmp/8dc60406808a4da/antenv/lib/python3.11/site-packages/rel/registrar.py", line 300, in check_events
2024-04-27T09:59:19.991876686Z     self.handle_error(fd)
2024-04-27T09:59:19.991880286Z   File "/tmp/8dc60406808a4da/antenv/lib/python3.11/site-packages/rel/registrar.py", line 185, in handle_error
2024-04-27T09:59:19.991884187Z     self.callback('read', fd)
2024-04-27T09:59:19.991888087Z   File "/tmp/8dc60406808a4da/antenv/lib/python3.11/site-packages/rel/registrar.py", line 179, in callback
2024-04-27T09:59:19.991898687Z     self.events[etype][fd].callback()
2024-04-27T09:59:19.991902887Z   File "/tmp/8dc60406808a4da/antenv/lib/python3.11/site-packages/rel/listener.py", line 127, in callback
2024-04-27T09:59:19.991907287Z     if not self.cb(*self.args) and not self.persist and self.active:
2024-04-27T09:59:19.991924987Z            ^^^^^^^^^^^^^^^^^^^
2024-04-27T09:59:19.991929087Z   File "/tmp/8dc60406808a4da/antenv/lib/python3.11/site-packages/websocket/_app.py", line 515, in read
2024-04-27T09:59:19.991933287Z     op_code, frame = self.sock.recv_data_frame(True)
2024-04-27T09:59:19.991936687Z                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2024-04-27T09:59:19.991940587Z   File "/tmp/8dc60406808a4da/antenv/lib/python3.11/site-packages/websocket/_core.py", line 461, in recv_data_frame
2024-04-27T09:59:19.991944587Z     self.pong(frame.data)
2024-04-27T09:59:19.991948187Z   File "/tmp/8dc60406808a4da/antenv/lib/python3.11/site-packages/websocket/_core.py", line 377, in pong
2024-04-27T09:59:19.991952087Z     self.send(payload, ABNF.OPCODE_PONG)
2024-04-27T09:59:19.991957087Z   File "/tmp/8dc60406808a4da/antenv/lib/python3.11/site-packages/websocket/_core.py", line 297, in send
2024-04-27T09:59:19.991960987Z     return self.send_frame(frame)
2024-04-27T09:59:19.991964487Z            ^^^^^^^^^^^^^^^^^^^^^^
2024-04-27T09:59:19.991967987Z   File "/tmp/8dc60406808a4da/antenv/lib/python3.11/site-packages/websocket/_core.py", line 337, in send_frame
2024-04-27T09:59:19.991971787Z     l = self._send(data)
2024-04-27T09:59:19.991975087Z         ^^^^^^^^^^^^^^^^
2024-04-27T09:59:19.991978787Z   File "/tmp/8dc60406808a4da/antenv/lib/python3.11/site-packages/websocket/_core.py", line 559, in _send
2024-04-27T09:59:19.992036988Z     return send(self.sock, data)
2024-04-27T09:59:19.992043088Z            ^^^^^^^^^^^^^^^^^^^^^
2024-04-27T09:59:19.992047388Z   File "/tmp/8dc60406808a4da/antenv/lib/python3.11/site-packages/websocket/_socket.py", line 176, in send
2024-04-27T09:59:19.992051988Z     return _send()
2024-04-27T09:59:19.992056188Z            ^^^^^^^
2024-04-27T09:59:19.992060688Z   File "/tmp/8dc60406808a4da/antenv/lib/python3.11/site-packages/websocket/_socket.py", line 153, in _send
2024-04-27T09:59:19.992065088Z     return sock.send(data)
2024-04-27T09:59:19.992069088Z            ^^^^^^^^^^^^^^^
2024-04-27T09:59:19.992073088Z   File "/opt/python/3.11.7/lib/python3.11/ssl.py", line 1243, in send
2024-04-27T09:59:19.998976055Z     return self._sslobj.write(data)
2024-04-27T09:59:19.998993255Z            ^^^^^^^^^^^^^^^^^^^^^^^^
2024-04-27T09:59:19.998998955Z ssl.SSLEOFError: EOF occurred in violation of protocol (_ssl.c:2427)

The process restarts and app keeps running until another exception appears. I have a feeling that i am missing some configuration in Azure. App is configured to be “Always on”

Full app configuration:
enter image description here

tryed everything i could google on this topic with no luck