Unrest

Description

Request routing for AWS Lambda running Nodejs, written in Typescript

Motivation: Existing routing libraries are inefficient. This library uses a trie data structure with local caching to improve lookup and response time. (More latency data to come)

Install

npm install @pyriter/unrest

Features

1. Define routes
2. Define controllers
3. Type the request body

One Time Setup

Set the "noStrictGenericChecks" to true in your tsconfig to avoid typescript errors

{
  "compilerOptions": {
    ...
    "noStrictGenericChecks": true,
    ...
  }
}

Usage

Simple HTTP GET examples

import { StatusType, Unrest } from "@pyriter/unrest";
import { APIGatewayProxyEvent } from "aws-lambda";
import { UnrestResponse } from "./unrestResponse";
import { RequestProps } from "./route";

class ApiServiceHandler {
  private readonly unrest: Unrest;

  constructor() {
    this.unrest = Unrest.builder()
      .withRoute({
        method: MethodType.GET,
        path: "/api/v1/ping",
        handler: async (): Promise<Response> => {
          return Response.builder()
            .withStatusCode(StatusType.OK)
            .withBody({
              message: "success"
            }).build();
        }
      })
      .withRoute({
        method: MethodType.GET,
        path: "/api/v1/user/{userId}",
        handler: async (props: RequestProps<undefined>): Promise<Response> => {
          const { urlParams } = props;
          const { userId } = urlParams;

          console.log(`The user id from request is `, userId);

          return Response.builder()
            .withStatusCode(StatusType.OK)
            .withBody({
              message: "success"
            }).build();
        }
      })
      .withRoute({
        method: MethodType.POST,
        path: "/api/v1/user/{userId}",
        handler: async (props: RequestProps<User>): Promise<Response> => {
          const { urlParams, body } = props;
          const { userId } = urlParams;

          console.log(`The user id from request is `, userId);
          console.log(`The user object from the request body is `, body);

          return Response.builder()
            .withStatusCode(StatusType.OK)
            .withBody({
              message: "success"
            }).build();
        }
      })
      .withRoute({
        method: MethodType.GET,
        path: "/api/v1/quote",
        handler: async (props: RequestProps<undefined>): Promise<Response> => {

          const { queryStringParams } = props;
          console.log(`query string params from request url`, queryStringParams);

          return Response.builder()
            .withStatusCode(StatusType.OK)
            .withBody({
              message: "success"
            }).build();
        }
      })
      .build();
  }

  async handle(event: APIGatewayProxyEvent):
    Promise<UnrestResponse> {
    return await this.unrest.execute(event);
  }
}

Additional Route Examples

You can use openApi style URL params to define key value pairs like this {keyName}.

const unrest = Unrest.builder()
  .withRoute({
    method: MethodType.GET,
    path: '/api/v1/ping',
    handler: pingController.getPing,
    thisReference: pingController
  })
  .withRoute({
    method: MethodType.POST,
    path: '/api/v1/account',
    handler: accountController.postAccount,
    thisReference: accountController
  })
  .withRoute({
    method: MethodType.PUT,
    path: '/api/v1/account/{accountId}',
    handler: accountController.putAccount,
    thisReference: accountController
  })
  .withRoute({
    method: MethodType.DELETE,
    path: '/api/v1/account/{accountId}',
    handler: accountController.deleteAccount,
    thisReference: accountController
  })
  .withRoute({
    method: MethodType.GET,
    path: '/api/v1/user/{userId}/order/{orderId}',
    handler: orderController.getOrderFromUser,
    thisReference: orderController
  })
  .build();

API

Unrest

The routing library itself. It can execute an APIGatewayEvent and invoke the desired controller.

Unrest.builder()

Returns the builder for creating an instance of the unrest object.