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@vladbasin/strong-api-middleware-aws-lambda

v1.1.9

Published

Strongly typed API middleware for AWS Lambda

Downloads

261

Readme

Strong API middleware for AWS Lambda

Strongly typed API middleware for writing AWS Lambda functions

Installation

npm

npm install @vladbasin/strong-api-middleware-aws-lambda @vladbasin/strong-api-mapping @vladbasin/ts-result aws-lambda reflect-metadata joi

yarn

yarn add @vladbasin/strong-api-middleware-aws-lambda @vladbasin/ts-result @vladbasin/strong-api-mapping aws-lambda reflect-metadata joi

Usage

  1. Import reflect-metadata ONCE in your index file:
import 'reflect-metadata';
  1. Define Request model
import { body, header, path, query } from '@vladbasin/strong-api-mapping';

export class RequestPayload {
    @path()
    public userId!: number;

    @path({ key: 'userId' })
    public id!: number;

    @query()
    public name!: string;

    @query()
    public isAdmin!: boolean;

    @query({ key: 'lastname' })
    public surname!: string;

    @query({ parser: String })
    public cars!: string[];

    @query({ parser: Number })
    public cash!: number[];

    @body()
    public details!: DetailsType;

    @header({ key: 'Content-Type' })
    public contentType!: string;

    @header({ key: 'X-Info', parser: String })
    public info!: string[];
}
  1. Define Response model
import { body } from '@vladbasin/strong-api-mapping';

export class ResponsePayload {
    @body()
    public user!: UserType;
}
  1. Define validation rules with Joi
export const RequestPayloadSchema = Joi.object<RequestPayload>({
    surname: Joi.string().min(10),
    cars: Joi.array().max(3),
    // other rules for field content...
});
  1. Create AWS Lambda using IFunction interface
import { IFunction } from '@vladbasin/strong-api-middleware-aws-lambda';
import { assign } from 'lodash';

class MyFunction implements IFunction<RequestPayload, ResponseDataPayload> {
    public executeAsync(request: ApiRequestType<RequestPayload>) {
        // handle request and return Result<ApiResponseType>

        return Result
            .FromPromise(loadUserInformationAsync(request.userId)))
            .onSuccess(user => ({
                statusCode: HttpStatusCodes.Ok,
                payload: {
                    data: assign(new ResponsePayload(), { user }),
                },
            }));
    }
}
  1. Call handleStrongApiLambdaRequest() when you want to process AWS Lambda function
handleStrongApiLambdaRequest({
    // pass function to execute
    function: new MyFunction(),
    // configure request handling
    request: {
        // define request payload model which will be automapped
        payload: {
            Model: RequestPayload,
            schema: RequestPayloadSchema,
        }
    },
    // configure response handling
    response: {
        // process request handling failure
        processFailure: {
            options: {
                // output possibly sensitive information (useful for debugging)
                allowSensitive: true,
            },
            // OPTIONAL
            responseCreator: (error, options, defaultResponseCreator) => { 
                // create ApiResponseType<TSuccessModel, TErrorModel> when error happens (by default done by this library automatically)
            },
        },
    },
});

This method returns (event: APIGatewayProxyEvent): Promise<APIGatewayProxyResult> that is AWS Lambda.

In addition, you can share request/response models with your API consumers, so they don't need to repeat the same mapping & validation logic. See: @vladbasin/strong-api-client