How to set routing in serverless framework

Question

I would like to develop sample apps and its routing by using serverless-framework . I send following command

sls create -t aws-nodejs-typescript -n sample-api-dev

It generate following directory

.
├── src
│   ├── functions               # Lambda configuration and source code folder
│   │   ├── hello
│   │   │   ├── handler.ts      # `Hello` lambda source code
│   │   │   ├── index.ts        # `Hello` lambda Serverless configuration
│   │   │   ├── mock.json       # `Hello` lambda input parameter, if any, for local invocation
│   │   │   └── schema.ts       # `Hello` lambda input event JSON-Schema
│   │   │
│   │   └── index.ts            # Import/export of all lambda configurations
│   │
│   └── libs                    # Lambda shared code
│       └── apiGateway.ts       # API Gateway specific helpers
│       └── handlerResolver.ts  # Sharable library for resolving lambda handlers
│       └── lambda.ts           # Lambda middleware
│
├── package.json
├── serverless.ts               # Serverless service file
├── tsconfig.json               # Typescript compiler configuration
├── tsconfig.paths.json         # Typescript paths
└── webpack.config.js           # Webpack configuration

handler.ts

import type { ValidatedEventAPIGatewayProxyEvent } from '@libs/api-gateway';
import { formatJSONResponse } from '@libs/api-gateway';
import { middyfy } from '@libs/lambda';

import schema from './schema';

const hello: ValidatedEventAPIGatewayProxyEvent<typeof schema> = async (event) => {
  return formatJSONResponse({
    message: `Hello ${event.body.name}, welcome to the exciting Serverless world!`,
    event,
  });
};

export const main = middyfy(hello);

after that I send following command

sls local start

MAC0157:$ sls offline start
Running "serverless" from node_modules

Starting Offline at stage dev (us-east-1)

Offline [http for lambda] listening on http://localhost:3002
Function names exposed for local invocation by aws-sdk:
           * hello: pricing-api-dev-dev-hello

   ┌─────────────────────────────────────────────────────────────────────────┐
   │                                                                         │
   │   POST | http://localhost:3000/dev/hello                                │
   │   POST | http://localhost:3000/2015-03-31/functions/hello/invocations   │
   │                                                                         │
   └─────────────────────────────────────────────────────────────────────────┘

Server ready: http://localhost:3000 🚀

My question is

① How can I set routing in each function? for example, I would like to add GET function in my project.I couldn't find how to set routing in my function.Where is POST defined in hello/handler.ts ?

② How can I change environment? it seems that offline start at stage dev ( us-east-1), how can I change this stage? Are there any setting needed?

If someone has opinion or materials will you please let me know. Thanks

Thanks

Answer 1

You can still use the same function signature for get request.

Just write it this way for get request:

const getFunc: ValidatedEventAPIGatewayProxyEvent<typeof undefined> = async (event) => {

//Your function logic goes in here

  return formatJSONResponse({
    message: `Hello, welcome to the exciting Serverless world!`,
    
  });
};

PS: When initiating a get request, there is no need for a body request property which from my understanding is validated against the schema; so you can just specify undefined for the schema type.