lambda-generator-handler

Run a generator function as an AWS Lambda function, when you are using lambda-proxy integration with API Gateway.

Install

$ npm install --save lambda-generator-handler

Usage

Create your AWS Lambda function as a generator and then export it wrapped by the lambda-generator-handler package. Note that this library is only for use when you have configured your endpoint in API Gateway to use lambda-proxy integration with your Lambda function.

const generatorHandler = require('lambda-generator-handler');

function* someHandler(event) {
    // The 'event' arg is the AWS Lambda event object.
    // Throw an error if something bad happens.
    // Return a result as you normally do from a generator.
    return { name: 'the result' };
}

module.exports.handler = generatorHandler(someHandler);

If your handler throws an exception, this wrapper catches it and returns an error response to AWS Lambda. It checks that the error message includes a serverless framework type of error code prefix (e.g., the [500] prefix in the message [500] Some error occurred), and adds one if none exists. It also turns a DynamoDB ConditionalCheckFailedException into a 400 Stale Data error response.

License

MIT