python firebase realtime listener

Question

Hi there I\'m new in python. I would like to implement the listener on my Firebase DB. When I change one or more parameters on the DB my Python code have to do something. Ho

Answer 1

If Anybody wants to create multiple listener using same listener function and want to get more info about triggered node, One can do like this.

Normal Listener function will get a Event object it has only Data, Node Name, Event type. If you add multiple listener and You want to differentiate between the data change. You can write your own class and add some info to it while creating object.

class ListenerClass:
    def __init__(self, appname):
        self.appname = appname

    def listener(self, event):
        print(event.event_type)  # can be 'put' or 'patch'
        print(event.path)  # relative to the reference, it seems
        print(event.data)  # new data at /reference/event.path. None if deleted
        print(self.appname) # Extra data related to change add your own member variable

Creating Objects:

listenerObject = ListenerClass(my_app_name + '1')
db.reference('PatientMonitoring', app= obj).listen(listenerObject.listener)

listenerObject = ListenerClass(my_app_name + '2')
db.reference('SomeOtherPath', app= obj).listen(listenerObject.listener)

Full Code:

import firebase_admin
from firebase_admin import credentials
from firebase_admin import db

# Initialising Database with credentials
json_path = r'E:\Projectz\FYP\FreshOnes\Python\PastLocations\fyp-healthapp-project-firebase-adminsdk-40qfo-f8fc938674.json'
my_app_name = 'fyp-healthapp-project'
xyz = {'databaseURL': 'https://{}.firebaseio.com'.format(my_app_name),'storageBucket': '{}.appspot.com'.format(my_app_name)}

cred = credentials.Certificate(json_path)        
obj = firebase_admin.initialize_app(cred,xyz , name=my_app_name)

# Create Objects Here, You can use loops and create many listener, But listener will create thread per every listener, Don't create irrelevant listeners. It won't work if you are running on machine with thread constraint

listenerObject = ListenerClass(my_app_name + '1') # Decide your own parameters, How you want to differentiate. Depends on you
db.reference('PatientMonitoring', app= obj).listen(listenerObject.listener)

listenerObject = ListenerClass(my_app_name + '2')
db.reference('SomeOtherPath', app= obj).listen(listenerObject.listener)