How to detect changes in firebase child with python?

Question

I have some troubles with this application. What I need is that If I detect a change in the database (FIREBASE) particularly in \'sala\' and \'ventilacion\' nodes the functi

Answer 1

I was working on the same thing so according to current updates on pyrebase and learning from above posted answers, I got this running perfectly.(Please make sure your python is upgraded from python2 to python3 for running pyrebase and firebase-admin)

import firebase_admin
import pyrebase
from firebase_admin import credentials

config = {
    "apiKey": "",
    "authDomain": "",
    "databaseURL": "",
    "projectId": "",
    "storageBucket": "",
    "serviceAccount": "path to the service account json file you downloaded",
    "messagingSenderId": "",
    "appId": "",
    "measurementId": ""
}

firebase = pyrebase.initialize_app(config)
storage = firebase.storage()
cred = credentials.Certificate("path to downloaded json file")

firebase_admin.initialize_app(cred, {
    "databaseURL": "same as config",
    "databaseAuthVariableOverride": None
})
db = firebase.database()

def ignore_first_call(fn):
    called = False

    def wrapper(*args, **kwargs):
        nonlocal called
        if called:
            return fn(*args, **kwargs)
        else:
            called = True
            return None
    return wrapper

def stream_handler(message):
    ab = str(1)
    all_videos = storage.child("videos/").list_files() #node where files are

    path_on_local = "local path to save the downloads"
    print(message["event"]) # put
    print(message["path"]) # /-K7yGTTEp7O549EzTYtI
    print(message["data"]) # {'title': 'Pyrebase', "body": "etc..."}

    node = str(message["path"]).split('/')[-2] 
    property = str(message["path"]).split('/')[-1]
    value = message["data"]

    if (message["event"] == "put"):
        for videos in all_videos:
            try:
                print(videos.name)
                z = storage.child(videos.name).get_url(None)
                storage.child(videos.name).download(path_on_local + "/" + ab + ".mp4")
                x = int(ab)
                ab = str(x + 1)
            except:
                print('Download Failed')

    else:
        print("error")

my_stream = db.child("videos").stream(stream_handler)