[メモ]Cloud Functions + Node.jsでさくっとAPI開発

firebase --version 
9.1.0

https://console.firebase.google.com/u/0/

cd desktop
mkdir api
cd api

$ mkdir api 
$ cd api
$ firebase init

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You're about to initialize a Firebase project in this directory:

  /Users/user/Desktop/api

? Which Firebase CLI features do you want to set up for this folder? Press Space to select features, then Enter to confirm your choices. 
 ◯ Database: Configure Firebase Realtime Database and deploy rules
 ◯ Firestore: Deploy rules and create indexes for Firestore
❯◉ Functions: Configure and deploy Cloud Functions
 ◯ Hosting: Configure and deploy Firebase Hosting sites
 ◯ Storage: Deploy Cloud Storage security rules
 ◯ Emulators: Set up local emulators for Firebase features
 ◯ Remote Config: Get, deploy, and rollback configurations for Remote Config

=== Project Setup

First, let's associate this project directory with a Firebase project.
You can create multiple project aliases by running firebase use --add, 
but for now we'll just set up a default project.

? Please select an option: (Use arrow keys)
❯ Use an existing project 
  Create a new project 
  Add Firebase to an existing Google Cloud Platform project 
  Don't set up a default project 

? Please select an option: Use an existing project
? Select a default Firebase project for this directory: 
  xxxxxxxx (yyyy) 
❯ api-189bf (api) 
  xxxxxxxx (yyyyy) 
  xxxxxxxx (yyyyy) 

=== Functions Setup

A functions directory will be created in your project with a Node.js
package pre-configured. Functions can be deployed with firebase deploy.

? What language would you like to use to write Cloud Functions? (Use arrow keys)
❯ JavaScript 
  TypeScript 

? What language would you like to use to write Cloud Functions? JavaScript
? Do you want to use ESLint to catch probable bugs and enforce style? Yes
✔  Wrote functions/package.json
✔  Wrote functions/.eslintrc.json
✔  Wrote functions/index.js
✔  Wrote functions/.gitignore
? Do you want to install dependencies with npm now? Yes

> protobufjs@6.10.2 postinstall /Users/inoueyousuke/Desktop/api/functions/node_modules/protobufjs
> node scripts/postinstall

i  Writing configuration info to firebase.json...
i  Writing project information to .firebaserc...
i  Writing gitignore file to .gitignore...

✔  Firebase initialization complete!

constfunctions=require('firebase-functions');// // Create and Deploy Your First Cloud Functions// // https://firebase.google.com/docs/functions/write-firebase-functions//// exports.helloWorld = functions.https.onRequest((request, response) => {//   functions.logger.info("Hello logs!", {structuredData: true});//   response.send("Hello from Firebase!");// });

constfunctions=require('firebase-functions');// // Create and Deploy Your First Cloud Functions// // https://firebase.google.com/docs/functions/write-firebase-functionsexports.helloWorld=functions.https.onRequest((request,response)=>{functions.logger.info("Hello logs!",{structuredData:true});response.send("Hello from Firebase!");});

firebase deploy

=== Deploying to 'api-189bf'...

i  deploying functions
Running command: npm --prefix "$RESOURCE_DIR" run lint

> functions@ lint /Users/user/Desktop/api/functions
> eslint .

✔  functions: Finished running predeploy script.
i  functions: ensuring required API cloudfunctions.googleapis.com is enabled...
i  functions: ensuring required API cloudbuild.googleapis.com is enabled...
⚠  functions: missing required API cloudbuild.googleapis.com. Enabling now...
✔  functions: required API cloudfunctions.googleapis.com is enabled
✔  functions: required API cloudbuild.googleapis.com is enabled
i  functions: preparing functions directory for uploading...
i  functions: packaged functions (33.28 KB) for uploading
✔  functions: functions folder uploaded successfully
i  functions: creating Node.js 12 function helloWorld(us-central1)...
✔  functions[helloWorld(us-central1)]: Successful create operation. 
Function URL (helloWorld): https://us-central1-api-189bf.cloudfunctions.net/helloWorld

✔  Deploy complete!

Project Console: https://console.firebase.google.com/project/api-189bf/overview

constfunctions=require("firebase-functions");exports.post=functions.https.onRequest(async(request,response)=>{//CORS用にAccess-Control-Allow系ヘッダを追加response.set("Access-Control-Allow-Origin","https://xxxxxx.com");//DELETEだけは拒否response.set("Access-Control-Allow-Methods","GET, HEAD, OPTIONS, POST");//Content-Typeのみを許可response.set("Access-Control-Allow-Headers","Content-Type");// dataフィールドに渡したい値は入れるresponse.json({data:"hello!!"});});

npm install xxx

npm i firebase-admin --save

constfunctions=require('firebase-functions')// cloud functionでfirestoreを使うのに必要な設定は以下の２行constadmin=require('firebase-admin')admin.initializeApp(functions.config().firebase)// データベースの参照を作成varfireStore=admin.firestore()exports.helloWorld=functions.https.onRequest((request,response)=>{// 動作確認のため適当なデータをデータベースに保存varcitiesRef=fireStore.collection('cities');citiesRef.doc('SF').set({name:'San Francisco',state:'CA',country:'USA',capital:false,population:860000})varcityRef=fireStore.collection('cities').doc('SF')cityRef.get().then(doc=>{if(!doc.exists){response.send('No such document!')}else{response.send(doc.data())}}).catch(err=>{response.send('not found')})})