How To Make Get Request Firebase Cloud Functions

I am developing an app and I want to send my user coordinate from firestore to locationiq.com to get details and then write it in firestore I am using firebase cloud function to ma

Solution 1:

As explained by Doug in his comments above, you need to return a Promise.

The request library you are using supports callback interfaces natively but does not return a promise.

You can use request-promise (https://github.com/request/request-promise) and the rp() method which "returns a regular Promises/A+ compliant promise" and then adapt your code as follows:

const functions = require('firebase-functions');
const admin = require ('firebase-admin');
const rp = require('request-promise');
admin.initializeApp();

exports.geoCoder = functions.firestore
  .document('geocoder/{location}')
  .onCreate((snap, context) => {
    const latitude = snap.data().coordinate.latitude;
    const longtude = snap.data().coordinate.longtude;
    const part1 =
      'https://us1.locationiq.com/v1/reverse.php?key=XXXXXXXXXXXXXX&lat=';
    const part2 = '&lon=';
    const part3 = '&format=json';

    const options = {
      uri: part1 + latitude + part2 + longtude + part3,
      json: true// Automatically parses the JSON string in the response
    };

    returnrp(options)
      .then(parsedBody => {
        return admin
          .firestore()
          .doc('geocoder/' + context.params.location)
          .update({ city: parsedBody.address.state });
      })
      .catch(err => {
        console.log(err);
        returnnull;
      });
  });