Tsed: [AWS] TSED.io without WEB API

[amellovmware]

Information

• Version: 5.19
• Type: Story

Description

I am using TSED.io for a API that runs in container, and also I am trying to use TSED for lambda functions subscribed on SNS topics (which don't need a WEB API).

Is there a way to use TSED.io Injectables/services on a Lambda function context?

[Romakita]

Hello @amellovmware
Yes, it could be possible. @tsed/di can be used in standalone.

Declare your service:

import {Service} from "@tsed/di";
@Service() // or @Injectable
export class MyService {
   $onInit() { // fired by DI

   }

   $customEvent() {
   }

   createSomething() {}
}

```typescript
import {InjectorService} from "@tsed/di";
import {MyService} from "./MyService";

async function bootstrap() {
const injector = new InjectorService()

// Load all providers registered via @Injectable/@Service decorators. You just have to import
// your class in this same module
await injector.load() // fire $onInit event

// Get a specific service
const myService = injector.get()
myService.createSomething()

// Emit a custom event
await injector.emit("customEvent") // accept args

// And finally destroy injector and his instances (see injector hooks)
await injector.destroy()
}

bootstrap()

It also possible to use a container when you use injector.load().

```typescript
import {Container, InjectorService} from "@tsed/di";
import {MyService} from "./MyService";

const container = new Container()
container.addProvider(MyService);

async function bootstrap() {
   const injector = new InjectorService()
   await injector.load(container)
}

I hope this example will help you :)
See you
Romain

[chiqui3d]

Hey!
You could put this example in the tsed.io as serverless example with lambda, I don't know if I'll really use it, but now it's very trendy, and I'm sure it will attract more people for your project.

[Romakita]

Yes sure. I have to found an example with express and lambda expression before and write a short example page ;)

[Romakita]

Ok I see, The goal is to use the entire tsed app without running / listen server :).
It's same things as run the unit test with SuperTest. I'll try to provide a complete example and maybe a package to wrap the server into a lambda function (if it's necessary)

[Romakita]

Here a quick example with aws-serveless-express:

import awsServerlessExpress  from 'aws-serverless-express'
import  {ExpressApplication, ServerLoader} from '@tsed/common'
import {Server} from './Server'

const server = awsServerlessExpress.createServer(app)

exports.handler = async (event, context) => {
  const appServer = await ServerLoader.bootstrap(Server)
  const server = awsServerlessExpress.createServer(server.injector.get(ExpressApplication))
  awsServerlessExpress.proxy(server, event, context) 
}

This solution require Ts.ED v5.26.0.

I don't know if this code works properly. Any help would be appreciate to test this code :)

See you
Romain

[Romakita]

The tutorial about aws and tsed is up to date: http://tsed.io/tutorials/aws.html
and a dedicated example repository: https://github.com/TypedProject/tsed-example-aws

[chiqui3d]

Impressive, I'll try to test it soon.