How to setting up NestJS on Firebase Cloud

Option A - Point a Function to Nest

The first setup modifies the functions configuration to use the Nest **/dist** output, as opposed to the default functions directory. This option is ideal if you have an existing Nest app.

Step 1 - Create Nest App

nest generate app server

Step 2 - Add Functions

Add functions, then delete the automatically generated directory.

npm i -g firebase-tools
firebase init functions


rm -rf functions 

Now update the firebase config to point to the nest app.

 "functions": {
    "predeploy": [
      "npm --prefix \"$RESOURCE_DIR\" run build"
    ],
&nbsp; &nbsp; "source": "server" // <-- here
&nbsp; }
}

firebase.json

Step 3 - Install Dependencies

cd server
npm i firebase-functions firebase-admin express @nestjs/platform-express

Step 4 - Update the package.json

Add the following lines to your package.json.

{
  // ...
  "main": "dist/index.js",
  "engines": {
    "node": "8"
  }
}

Step 5 - Export the Server

Create a new file named **src/index.ts** that creates an exress app and wraps it with Nest.

import { NestFactory } from '@nestjs/core';
import { ExpressAdapter } from '@nestjs/platform-express';
import { AppModule } from './app.module';
import * as express from 'express';
import * as functions from 'firebase-functions';

const server = express();

export const createNestServer = async (expressInstance) => {
  const app = await NestFactory.create(
    AppModule,
    new ExpressAdapter(expressInstance),
  );


  return app.init();
};

createNestServer(server)
    .then(v => console.log('Nest Ready'))
    .catch(err => console.error('Nest broken', err));


export const api = functions.https.onRequest(server);

Step 6 - Build, Serve, Deploy

npm run build
firebase serve --only functions
firebase deploy --only functions

Option B - Add Nest to the Functions Source

In this setup, we perform a fresh install of Nest in the Functions source code. This is a good approach if you have existing background functions, but want to wrap Nest as an HTTP function.

Step 1 - Initialize Cloud Functions

Initialize Cloud Functions making sure to choose the TypeScript option.

npm i -g firebase-tools
firebase init functions

Step 2 - Install NestJS

Install Nest. If you have an existing project, also copy over the other dependencies from your Package.json.

cd functions
npm i --save @nestjs/core @nestjs/common rxjs reflect-metadata express @nestjs/platform-express

Step 3 - Add NestCLI Support

One of the best features in Nest is the CLI. Let’s add support by creating the following file:

functions/nest-cli.json

{
    "language": "ts",
    "collection": "@nestjs/schematics",
    "sourceRoot": "src"
  }
  

Step 4 - Update the TS Config

Nest uses TypeScript features that are not enabled in Cloud Functions by default. Let’s change that.

functions/tsconfig.json

{
  "compilerOptions": {
    "module": "commonjs",
    "noImplicitReturns": true,
    "noUnusedLocals": true,
    "outDir": "lib",
    "sourceMap": true,
    "strict": false,
    "target": "es2017",
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "declaration": true,
    "removeComments": true,
    "baseUrl": "./",
    "incremental": true,
    "esModuleInterop": true
  },
  "compileOnSave": true,
  "include": [
    "src"
  ]
}

Step 5 - Generate an App Module

nest generate module app --flat


nest generate controller egg

The file structure of Nest + Cloud Functions

Step 6 - Create the Server

Lastly, create the Nest server and wrap it in a Cloud Function. It’s purpose is to export an ExpressJS app and expose a function that wraps it with Nest.

functions/src/index.ts

import * as functions from 'firebase-functions';
import { NestFactory } from '@nestjs/core';
import { ExpressAdapter } from '@nestjs/platform-express';
import { AppModule } from './app.module';
import express from 'express';


const server = express();


const createNestServer = async (expressInstance) => {
  const app = await NestFactory.create(
    AppModule,
    new ExpressAdapter(expressInstance),
  );


  return app.init();
};




createNestServer(server)
    .then(v => console.log('Nest Ready'))
    .catch(err => console.error('Nest broken', err));


export const api = functions.https.onRequest(server);

Step 7 - Build, Serve, Deploy

cd functions
npm run serve


firebase deploy --only functions

The should give you a URL that looks like [**http://localhost:5000/YOUR-PROJECT/REGION/api/eggs**](http://localhost:5000/YOUR-PROJECT/REGION/api/eggs "**http://localhost:5000/YOUR-PROJECT/REGION/api/eggs**") where you can start testing the API. Happy Nesting 🥚🥚🥚!

Recommended Reading

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☞ How to Role-Based Access Control in a Node.js application

☞ How to Build Node.js Modules with Rust

☞ Node.js Tutorial for Beginners in 2020

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Given its affordability and agility, most enterprises opt for a multi-cloud approach in cloud computing now. A 2018 survey on the public cloud services market points out that 81% of the respondents use services from two or more providers. Subsequently, the cloud computing services market has reported incredible growth in recent times. The worldwide public cloud services market is all set to reach $500 billion in the next four years, according to IDC.

By choosing multi-cloud solutions strategically, enterprises can optimize the benefits of cloud computing and aim for some key competitive advantages. They can avoid the lengthy and cumbersome processes involved in buying, installing and testing high-priced systems. The IaaS and PaaS solutions have become a windfall for the enterprise’s budget as it does not incur huge up-front capital expenditure.

However, cost optimization is still a challenge while facilitating a multi-cloud environment and a large number of enterprises end up overpaying with or without realizing it. The below-mentioned tips would help you ensure the money is spent wisely on cloud computing services.

• Deactivate underused or unattached resources

Most organizations tend to get wrong with simple things which turn out to be the root cause for needless spending and resource wastage. The first step to cost optimization in your cloud strategy is to identify underutilized resources that you have been paying for.

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• Deploy monitoring mechanisms

The key to efficient cost reduction in cloud computing technology lies in proactive monitoring. A comprehensive view of the cloud usage helps enterprises to monitor and minimize unnecessary spending. You can make use of various mechanisms for monitoring computing demand.

For instance, you can use a heatmap to understand the highs and lows in computing visually. This heat map indicates the start and stop times which in turn lead to reduced costs. You can also deploy automated tools that help organizations to schedule instances to start and stop. By following a heatmap, you can understand whether it is safe to shut down servers on holidays or weekends.

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In simple terms, moving from local to the public cloud server is called cloud migration. Gartner says 17.5% revenue growth as promised in cloud migration and also has a forecast for 2022 as shown in the following image.

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For an up-to-date list of Google’s Cloud CDN cache sites, see https://cloud.google.com/cdn/docs/locations.

Task 1. Create and populate a Cloud Storage bucket

Cloud CDN content can originate from different types of backends:

• Compute Engine virtual machine (VM) instance groups
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• Internet network endpoint groups (NEGs), for endpoints that are outside of Google Cloud (also known as custom origins)
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In this lab, we will configure a Cloud Storage bucket as the backend.

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