lawos

lawos - Lambda Worker SQS

Library to process messages from an Amazon SQS queue with an AWS Lambda worker function or your favorite other JavaScript environment. Works fine with Serverless …

Install

$ > npm install lawos

Example

See lawos-serverless for an example of Lawos using Serverless.

Usage

Promise for every message

const AWS = require('aws-sdk');
const SQS = new AWS.SQS({apiVersion: '2012-11-05'});
 
const Lawos = require('lawos');
const Q = new Lawos('https://sqs.eu-west-1.amazonaws.com …', SQS);
 
Q.item(
  item => new Promise(done => {
    done();
  })
);
 
module.exports.handler = function(event, context, callback) {
  Q.work(
    () = Promise.resolve(context.getRemainingTimeInMillis() < 500)
  ).then(
    data => {
      callback(null, data);
    }
  );
};

Promise for a batch of messages

const AWS = require('aws-sdk');
const SQS = new AWS.SQS({apiVersion: '2012-11-05'});
 
const Lawos = require('lawos');
const Q = new Lawos('https://sqs.eu-west-1.amazonaws.com …', SQS);
 
Q.list(
  list => new Promise(done => {
    done();
  })
);
 
module.exports.handler = function(event, context, callback) {
  Q.work(
    () = Promise.resolve(context.getRemainingTimeInMillis() < 500)
  ).then(
    data => {
      callback(null, data);
    }
  );
};

Use AWS Lambda instead of Promise

const AWS = require('aws-sdk');
const Lawos = require('lawos');
 
const Lambda = new AWS.Lambda({apiVersion: '2015-03-31'});
const SQS = new AWS.SQS({apiVersion: '2012-11-05'});
 
const Q = new Lawos('https://sqs.eu-west-1.amazonaws.com …', SQS, Lambda);
 
Q.item('fake-function-name');
// Q.list('fake-function-name');
 
module.exports.handler = function(event, context, callback) {
  Q.work(
    () = Promise.resolve(context.getRemainingTimeInMillis() < 500)
  ).then(
    data => {
      callback(null, data);
    }
  );
};

License

Feel free to use the code, it's released using the MIT license.

Contributors

• Sebastian Müller