如何在 google 云函数中使用 geofirex

Question

我有一个用例，我需要在 Google Cloud Functions 中使用 geofirex 库。库的 init 函数需要 FirebaseApp 实例。是否可以在云函数中初始化它以便使用 firebase-admin 查询 firestore 数据库？

我试过的..

函数 > 源 > index.ts

import * as functions from 'firebase-functions';
import * as admin from 'firebase-admin';
admin.initializeApp();
admin.firestore().settings({timestampsInSnapshots: true});


// Init GeoFireX
import * as firebase from 'firebase/app';
import * as geofirex from 'geofirex';
const geoFire = geofirex.init(firebase);

exports.geofenceUserNotifications = functions.https.onRequest((req, res) => {
  if(!req || !req.body || !req.body.length || !req.body[0].latitude || !req.body[0].longitude || !req.body[0].uid || !req.body[0].userFcmToken){
    // end function with 401 status
    res.status(401).send('Authentication required.');
  }

  const uid = req.body[0].uid;
  const userFcmToken = req.body[0].userFcmToken;
  const latitude = req.body[0].latitude;
  const longitude = req.body[0].longitude;
  const field = 'position';

  geoFire.collection('users').setPoint(uid, field, latitude, longitude).then(result => {
    res.end('User geoPoint updated!');
  }).catch( err => {
      console.log(err);
      res.end('error when update user geo point!');
  });

});

函数 > package.json

{
  "name": "functions",
  "scripts": {
    "lint": "tslint --project tsconfig.json",
    "build": "tsc",
    "serve": "npm run build && firebase serve --only functions",
    "shell": "npm run build && firebase functions:shell",
    "start": "npm run shell",
    "deploy": "firebase deploy --only functions",
    "logs": "firebase functions:log"
  },
  "main": "lib/index.js",
  "dependencies": {
    "firebase-admin": "~6.0.0",
    "firebase-functions": "^2.1.0",
    "moment": "^2.23.0",
    "firebase": "^5.10.1",
    "geofirex": "0.0.6",
    "rxjs": "^6.3.3",
    "rxjs-compat": "^6.5.1"
  },
  "devDependencies": {
    "tslint": "~5.8.0",
    "typescript": "~2.8.3"
  },
  "private": true
}

部署时没有错误，但调用 geofenceUserNotifications 函数时出现此错误：

TypeError: app.firestore is not a function
    at new GeoFireCollectionRef (/user_code/node_modules/geofirex/dist/index.cjs.js:1465:24)
    at GeoFireClient.collection (/user_code/node_modules/geofirex/dist/index.cjs.js:1639:16)
    at exports.geofenceUserNotifications.functions.https.onRequest (/user_code/lib/index.js:2197:13)
    at cloudFunction (/user_code/node_modules/firebase-functions/lib/providers/https.js:57:9)
    at /var/tmp/worker/worker.js:783:7
    at /var/tmp/worker/worker.js:766:11
    at _combinedTickCallback (internal/process/next_tick.js:73:7)
    at process._tickDomainCallback (internal/process/next_tick.js:128:9)

提前致谢。

Answer 1

第二次检查，似乎Firebase Admin SDK for Node.js does have the concept of a FirebaseApp。您可能想尝试将 admin.app() 传递给 GeofireX 以对其进行初始化。

~~在 Cloud Functions 中，您使用的是 Firebase Admin SDK for Node.js，它没有 FirebaseApp.~~

~~的概念~~

~~从快速扫描来看，GeofireX 似乎只能与 Firebase 的客户端 JavaScript SDK 一起使用。您可能想要 file a feature request on its repo，甚至更好的 PR。 :)~~

Answer 2

问题解决如下：

const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp();
admin.firestore().settings({timestampsInSnapshots: true});

// Init GeoFireX
const geofirex = require('geofirex');// <-- Use require Instead of import geofirex
import { get } from 'geofirex';
const geoFire = geofirex.init(admin); // <-- admin not admin.app()

然后

exports.geofenceUserNotifications = functions.https.onRequest(async (req, res) => {

  //setPoint (id, field, lat, lng)
  geoFire.collection('users').setPoint(uid, field, latitude, longitude).then(result => {
    res.end('User geo point is updated!');
  }).catch( err => {
      res.end('error when update user geo point');
      return;
  });
});

geoFireX 工作正常。

但现在我遇到了 geoFireX 查询的其他问题。我尝试获取附近的项目，但 geoFireX returns Observable<object[]> 并且它在云功能中不起作用。

我尝试使用 geoFireX 的 get():

const query = geoFire.collection('places', queryRef).within(center, radius, field);
const nearbyPlaces = await get(query); // await query.pipe(operators.first()).toPromise();

但不幸的是它不起作用。我收到以下错误：

Error: Argument "onNext" is not a valid function. at Validator.(anonymous function).values [as isFunction] (/srv/node_modules/@google-cloud/firestore/build/src/validate.js:99:27) at Query.onSnapshot (/srv/node_modules/@google-cloud/firestore/build/src/reference.js:1524:25) at Observable._subscribe (/srv/node_modules/geofirex/dist/index.cjs.js:1597:33) at Observable._trySubscribe (/srv/node_modules/rxjs/internal/Observable.js:44:25) at Observable.subscribe (/srv/node_modules/rxjs/internal/Observable.js:30:22) at MapOperator.call (/srv/node_modules/rxjs/internal/operators/map.js:32:23) at Observable.subscribe (/srv/node_modules/rxjs/internal/Observable.js:25:31) at Object.subscribeToResult (/srv/node_modules/rxjs/internal/util/subscribeToResult.js:12:23) at CombineLatestSubscriber._complete (/srv/node_modules/rxjs/internal/observable/combineLatest.js:76:46) at CombineLatestSubscriber.Subscriber.complete (/srv/node_modules/rxjs/internal/Subscriber.js:78:18)

Answer 3

-- 也许这就是完整的解决方案--

两步：-

Adding Geopoint and Geohashes into firestore

Query with geopoint data

第 1 步解决方案： 为此，您必须添加 firebase-admin sdk 并使用 geofirex.init(admin) 配置 geofirex。例如：

const geofirex = require('geofirex');// <-- Use require Instead of import geofirex
import { get } from 'geofirex';
const geo = geofirex.init(admin); // <-- admin not admin.app()

现在您可以像这样存储您的 Geopoint 和 Geohashes：-

const point = geo.point(40.1, -119.1);

使用 firestore 将其存储到数据库中。

第 2 步解决方案： 为此，您必须使用 firebase web sdk 来配置 geofirex。否则，您将无法从您的 firestore 数据库中查询！例如：

import * as firebase from 'firebase';
var firebaseConfig = {
    apiKey: API_KEY_HERE,
    authDomain: DOMAIN_HERE,
    databaseURL: FIREBASE_REALTIME_DATABASE_URL,
    projectId: PROJECT_ID,
    storageBucket: STORAGE_BUCKET,
    messagingSenderId: MESSAGING_SENDER_ID,
    appId: FIREBASE_APP_ID,
    measurementId: MEASUREMENT_ID
  };
firebase.initializeApp(firebaseConfig);

import geofirex = require('geofirex');// <-- Now, use import Instead of require('geofirex')
const geo = geofirex.init(firebase.app()); // <-- firebase or, firebase.app()

您可以从您的 firebase 控制台 web sdk 设置中获取 firebaseConfig。只需复制并粘贴即可！ ;) 现在您可以像这样查询您的 firestore geopoint：-

router.get('/expert', (req, res, next) => {
    const radius = req.query.radius
    const lat = req.query.lat
    const lng = req.query.lng
    const field = 'position'

    geo.collection('ex-pending').within(geo.point(lat, lng), radius, field).subscribe(snap => {
        res.status(200).send(snap)
    })

})

就是这样！ :D

如何在 google 云函数中使用 geofirex

How to use geofirex inside google cloud functions

typescript

google-cloud-functions

geofirex