AWS Lambda ES module : not working

[ochaoui]

Hi folks,

I am trying to use "openapi-backend" in my lambda ES module. I did all the necessary to make it run following the tutorial. The problem is that it does not run on my lambda when I deploy it. here is my index.js code :

import {info} from './src/utils/logger.js';
import {OpenAPIBackend} from 'openapi-backend';

const headers = {
  'content-type': 'application/json',
  'access-control-allow-origin': '*', // lazy cors config
};

// create api with your definition file or object
const api = new OpenAPIBackend({definition: './spec/XXX-api-back.yml'});

// register your framework specific request handlers here
api.register({
  notFound: async (c, event, context) => ({
    statusCode: 404,
    body: JSON.stringify({err: 'not found'}),
    headers,
  }),
  validationFail: async (c, event, context) => ({
    statusCode: 400,
    body: JSON.stringify({err: c.validation.errors}),
    headers,
  }),
  getPostesRh: async (c, event, context) => ({
    statusCode: 200,
    body: JSON.stringify({operationId: c.operation.operationId}),
    headers,
  }),
  getPosteRh: async (c, event, context) => ({
    statusCode: 200,
    body: JSON.stringify({operationId: c.operation.operationId}),
    headers,
  }),
});

// initalize the backend
api.init();

/**
 *  Fonction de base attendue par le service AWS Lambda
 *
 * @param {JSON} event Event AWS Lambda trigger call
 * @param {JSON} context Context forwarded by AWS Lambda
 * @return {JSON} Dans la réponse : httpCode = 200 | 204 | 500,
 * message est non vide si erreur
 */
export async function handler(event, context) {
  info(`Start Function name - '${context.functionName}'`);
  return api.handleRequest(
      {
        method: event.httpMethod,
        path: event.path,
        query: event.queryStringParameters,
        body: event.body,
        headers: event.headers,
      },
      event,
      context,
  );
}

here is the cloudwatch log : { "level": "info", "message": "Start Function name - 'laf-XXX-api-expose'", "timestamp": "2022-07-11T15:31:33.226Z" } END RequestId: 1e7eebd5-1fd6-43ed-b2e3-fbc83ee88fbb

As we can see the lambda didn't run the controller when I called the API. Any idea why it didn't work ?

Regards,

[drodil]

You have to wait for the API to initialize. So for example:

const initedApi = api.init();
export async function handler(event, context) {
  await initedApi;
  return await api.handleRequest({...});
}

Also I suggest you set the 'quick' parameter in options as true.

[drodil]

Also note that event.queryStringParameters does not work if you have array query parameters in specification. I made a fix for that but not sure if it gets merged: https://github.com/anttiviljami/openapi-backend/pull/444