Failing Firebase Functions

functionsindex.js

/**
 * Copyright 2016 Google Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
"use strict";

const functions = require("firebase-functions");
const admin = require("firebase-admin");
admin.initializeApp();

/**
 * Triggers when a user gets a new follower and sends a notification.
 *
 * Followers add a flag to `/followers/{agentUid}/{clientUid}`.
 * Users save their device notification tokens to `/users/{agentUid}/notificationTokens/{notificationToken}`.
 */
exports.sendRequestNotification = exports.createUser = functions.firestore
  .document("Requests/{agentUid}")
  .onCreate((snap, context) => {
    // Get an object representing the document
    // e.g. {'name': 'Marie', 'age': 66}
    const newValue = snap.data();

    // access a particular field as you would any JS property
    const name = newValue.agent;

    // perform desired operations ...

    // Get the list of device notification tokens.
    exports.getDeviceTokensPromise = functions.firestore
      .document("/userTockens/{agentUid}")
      .then(function (doc) {
        if (doc.exists) {
          console.log("Document data:", doc.data());

          // The snapshot to the user's tokens.
          let tokensSnapshot;

          // The array containing all the user's tokens.
          let tokens = doc.data().token;

          const results = Promise.all([getDeviceTokensPromise]);
          tokensSnapshot = results[0];

          // Check if there are any device tokens.
          if (!tokensSnapshot.hasChildren()) {
            return console.log("There are no notification tokens to send to.");
          }
          console.log(
            "There are",
            tokensSnapshot.numChildren(),
            "tokens to send notifications to."
          );
          console.log("Fetched follower profile", follower);

          // Notification details.
          const payload = {
            notification: {
              title: "New Easy Ride Request",
              body: `${follower.displayName} needs help.`,
              //  icon: follower.photoURL
            },
          };

          // Listing all tokens as an array.
          tokens = Object.keys(tokensSnapshot.val());
          // Send notifications to all tokens.
          const response = admin.messaging().sendToDevice(tokens, payload);
          // For each message check if there was an error.
          const tokensToRemove = [];
          response.results.forEach((result, index) => {
            const error = result.error;
            if (error) {
              console.error(
                "Failure sending notification to",
                tokens[index],
                error
              );
              // Cleanup the tokens who are not registered anymore.
              if (
                error.code === "messaging/invalid-registration-token" ||
                error.code === "messaging/registration-token-not-registered"
              ) {
                tokensToRemove.push(
                  tokensSnapshot.ref.child(tokens[index]).remove()
                );
              }
            }
          });
          return Promise.all(tokensToRemove);
        }
      });
  });