Realtime Database Listener Crashes on Internet Disconnection

[moussamoussa911]

Description
When the internet disconnects, the Firebase Realtime Database listener crashes, even with try and except statements. The application fails to recover and reconnect the listeners, resulting in the following error:

javascript
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google.api_core.exceptions.RetryError: Deadline of 120.0s exceeded while calling target function, last exception: HTTPSConnectionPool(host='storage.googleapis.com', port=443): Max retries exceeded with url: /storage/v1/b/villaduniatest.appspot.com/o?projection=noAcl&prefix=pdfstable%2F&prettyPrint=false (Caused by NewConnectionError('<urllib3.connection.HTTPSConnection object at 0x0000017C6BBE79D0>: Failed to establish a new connection: [Errno 11001] getaddrinfo failed'))
Reconnecting...
Steps to Reproduce
Start a Firebase Realtime Database listener in a Python application.
Disconnect the internet.
Observe the application crash with the above error.
Expected Behavior
The application should handle the disconnection gracefully, retrying the connection until the internet is restored, without crashing.

Actual Behavior
The application crashes immediately upon internet disconnection, and does not recover.

Environment
Firebase Admin SDK: Python
Python Version: (your Python version)
Operating System: (your OS version)
Additional Context
Here is the relevant portion of the code:

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import firebase_admin
from firebase_admin import credentials, initialize_app, db
from requests.exceptions import ConnectionError, Timeout
import time

class DatabaseListener:
def init(self, app_instance):
self.app_instance = app_instance
self.listeners = {}

def start_listener(self, path, callback):
    ref = db.reference(path, app=self.app_instance)
    while True:
        try:
            listener = ref.listen(callback)
            self.listeners[path] = listener
            print(f"Listener started for path: {path}")
            break
        except (ConnectionError, Timeout) as e:
            print(f"Connection error starting listener for {path}: {e}")
            time.sleep(5)  # Retry after a delay

def stop_listener(self, path):
    if path in self.listeners:
        listener = self.listeners[path]
        listener.close()
        del self.listeners[path]
        print(f"Listener stopped for path: {path}")

def stop_all_listeners(self):
    for path in list(self.listeners.keys()):
        self.stop_listener(path)
    print("All listeners stopped.")

Any guidance or solutions to ensure the listener can recover from network disconnections would be greatly appreciated

[google-oss-bot]

I couldn't figure out how to label this issue, so I've labeled it for a human to triage. Hang tight.

[jonathanedey]

Duplicate of #287