CODEWITHSUNDEEP
node.jsfirebasefirebase-realtime-databaseaws-lambda
mattc19
mattc19

Reputation: 718

Pushing data to firebase from AWS Lambda won't work unless there is a delay on the callback

See below code. I'm working on an AWS lambda function that will push data to a firebase database. My problem is that the only way I've been able to get it to work is to put a setTimeout on the callback function inside of my handler. I don't understand why this is required. Doesn't the request get sent off to firebase before the callback starts.

This doesn't work.

var admin = require("firebase-admin");

admin.initializeApp({
  credential: admin.credential.cert("./info.json"),
  databaseURL: "https://app.firebaseio.com"
});

exports.handler = (event, context, callback) => {
    let x = admin.database().ref(`/12851/Winners`);
    x.push(525555);
    callback(null, {Winner: true});
};

This does work though.

var admin = require("firebase-admin");

admin.initializeApp({
  credential: admin.credential.cert("./info.json"),
  databaseURL: "https://app.firebaseio.com"
});

exports.handler = (event, context, callback) => {
    let x = admin.database().ref(`/12851/Winners`);
    x.push(525555);
    setTimeout(()=>{
        callback(null, {Winner: true});
    },1500)
};

Upvotes: 0

Views: 677

Answers (1)

Mathew Berg
Mathew Berg

Reputation: 28750

Wire into a .then instead since .push returns a promise:

var admin = require("firebase-admin");

admin.initializeApp({
  credential: admin.credential.cert("./info.json"),
  databaseURL: "https://app.firebaseio.com"
});

exports.handler = (event, context, callback) => {
    let x = admin.database().ref(`/12851/Winners`);
    x.push(525555).then(function(){
        callback(null, {Winner: true});
    });
};

Upvotes: 4

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