Write to firebase database from cloud function triggered by PubSub

Question

I'm trying to use a daily trigger to alter information in my Firebase database. I have a number of other cloud functions that work properly, but I can't seem to get this function to alter the database.

const admin = require('firebase-admin');
exports.daily_job = functions.pubsub.topic('daily-tick').onPublish((event) => {
  console.log("This job is run every day!");
  const databaseRef = admin.database().ref('/accountActions/dailyDeletion');
  databaseRef.child('delete').set("Data has been deleted!");
  return "End of database clearing";
});

This is the code I've been testing to see if the trigger is working. In my console it's showing that the function starts, the console statement is logged, and execution finishes in 40-90ms. But my database is never changed. The deletion statement never appears.

Any help is greatly appreciated!

It seems that I've initialized the app correctly. I tried altering my code the way you suggested and the function now times out. Any idea what might be going on? — rharding, Sep 28 '17 at 17:34

score 1 · Accepted Answer · answered Oct 17 '17 at 17:22

I found the answer to the problem. I had initialized the app according to Firebase's documentation on push notifications:

admin.initializeApp({


  credential: admin.credential.cert({
    projectId: {projectId},
    clientEmail: {email},
    privateKey: {private key}
  }),
 databaseURL: {databaseURL}
 });

But for some reason this caused issues. I switched it out with a simple

admin.initializeApp(functions.config().firebase);

This seems to have fixed the issue, and push notifications are still working.

Bob Snyder · Answer 2 · 2017-09-28T19:11:02.303

0

The documentation explains that a function that performs asynchronous processing must return a JavaScript Promise:

Resolve functions that perform asynchronous processing by returning a JavaScript promise

Change your code to this:

exports.daily_job = functions.pubsub.topic('daily-tick').onPublish((event) => {
  console.log("This job is run every day!");
  const databaseRef = admin.database().ref('/accountActions/dailyDeletion');
  return databaseRef.child('delete').set("Data has been deleted!").then(() => {
    console.log('End of database clearing');
  }).catch(error => {
    console.error('Database clearing failed: ', error);
  });
});

edited Sep 28 '17 at 19:11

answered Sep 28 '17 at 19:01

Bob Snyder

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Strangely, I'm still getting a timeout – rharding Sep 30 '17 at 17:04
@RossHarding: Does the cloud function log output show "End of database clearing"? – Bob Snyder Sep 30 '17 at 17:09
@RossHarding: The log shows only "This job is run every day!" and then timesout? – Bob Snyder Oct 01 '17 at 03:41
Yeah the exact logs I see are "Function execution started", "This job is run every day", and "Function execution took 60002 ms, finished with status: 'timeout'" – rharding Oct 01 '17 at 23:09

score 0 · Answer 3 · answered Oct 17 '17 at 00:44

0

Insert this command somewhere before exports.daily_job..

admin.initializeApp(functions.config().firebase);

answered Oct 17 '17 at 00:44

Vitor Mori

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Write to firebase database from cloud function triggered by PubSub

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