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serverless-nestjs

This is an example of creating a function that runs as nestjs using the serverless framework. Sample publish. https://mmjdx4zxmc.execute-api.ap-northeast-1.amazonaws.com/dev/

What is changed.

add

  • src/index.ts
  • src/swagger.ts
  • serverless.yml

change

  • package.json

How to use

Prepare

$ npm install @nestjs/cli serverless -g
$ git clone git@github.com:rdlabo/serverless-nestjs.git 【projectName】
$ cd 【projectName】
$ npm install
$ npm start

Development

use NestCLI

$ npm start

$ npm start
> serverless-nestjs@0.0.0 start /Users/sakakibara/dev/serverless-nestjs
> nest start

[Nest] 3905   - 11/29/2019, 4:40:49 PM   [NestFactory] Starting Nest application...
[Nest] 3905   - 11/29/2019, 4:40:49 PM   [InstanceLoader] AppModule dependencies initialized +20ms
[Nest] 3905   - 11/29/2019, 4:40:49 PM   [RoutesResolver] AppController {/}: +6ms
[Nest] 3905   - 11/29/2019, 4:40:49 PM   [RouterExplorer] Mapped {/, GET} route +3ms
[Nest] 3905   - 11/29/2019, 4:40:49 PM   [NestApplication] Nest application successfully started +4ms

Then browse http://localhost:3000

use serverless-offline

after also doing an: npm run build

$ sls offline
$ sls offline
Serverless: Starting Offline: dev/us-east-1.

Serverless: Routes for index:
Serverless: ANY /
Serverless: ANY /{proxy*}

Serverless: Offline listening on http://localhost:3000

Then browse http://localhost:3000

How to Deploy

$ npm run build && sls deploy

Options

Hot start

See : https://serverless.com/blog/keep-your-lambdas-warm/

These behavior can be fixed with the plugin serverless-plugin-warmup

1 Install the plugin

$ npm install serverless-plugin-warmup --save-dev

2 Enable the plugin

plugins:
  - '@hewmen/serverless-plugin-typescript'
  - serverless-plugin-optimize
  - serverless-offline
  - serverless-plugin-warmup

custom:
  # Enable warmup on all functions (only for production and staging)
  warmup:      
      - production
      - staging

Use Swagger for development

$ npx ts-node src/swagger.ts

[Nest] 6890   - 2019-03-24 15:11   [NestFactory] Starting Nest application...
[Nest] 6890   - 2019-03-24 15:11   [InstanceLoader] AppModule dependencies initialized +11ms
[Nest] 6890   - 2019-03-24 15:11   [RoutesResolver] AppController {/}: +224ms
[Nest] 6890   - 2019-03-24 15:11   [RouterExplorer] Mapped {/, GET} route +2ms
[Nest] 6890   - 2019-03-24 15:11   [NestApplication] Nest application successfully started +2ms

Then browse http://localhost:3001/api

This function is for development. If you want to use production, change package.json dependencies and serverless.yml.