Overview

This package provides an adapter that maps

See full documentation

The motivation behind this library is to help make your Node microservice code more portable, between web frameworks (such as Express or Koa) or Serverless model with cloud functions. We believe in the Hexagonal architecture where your core business logic should be loosely-coupled with the presentation interface and the underlying services.

Example

Install Hexagon via NPM

$ npm install @nedvisol/hexagon-core serverless-hexagon-plugin

Write your first controller by creating a plain-old Typescript class and annotate

// index.ts
import { RestController, RestGetMapping, RestPathParam } from '@nedvisol/hexagon-core';
@RestController()
export class UserController {  
 
  @RestGetMapping('/users/:id')
  getUser (@RestPathParam('id') id: string): IUser {
    return { id, name: 'test' };
  }
}

Then add Hexagon plugin, and the controller details to your Serverless configuration.

Note: using Typescript format for Serverless configuration is required. We use this to load the controller files at build time to able to generate the handlers.

serverless.ts:

import type { AWS } from '@serverless/typescript';

import './index'; // this is where your annotated controller class is, load all files as needed

const serverlessConfiguration: AWS = {
    //...
    plugins: ['serverless-hexagon-plugin', ...],  // put Hexagon plugin before other plugins such as module bundlers or offline plugin
    custom: {
        hexaTsPlugin: {
            controllers: [  // declare each of your controller and the file it resides in
                {
                    controllerClass: 'UserController',
                    file: './index.ts'
                }
            ]
        }
    }
}

Note: your controller names must be unique.

Then you can use Serverless life cycle as normal. The plugin is activated in the initialization of Serverless life-cycle. It automatically generates the function configuration, event mapping, and the function handler code, which will be used by all subsequent steps.

$ serverless deploy -r us-west-2 -s dev