Skip to content

Instantly share code, notes, and snippets.

@juancarloscruzd
Created September 7, 2019 19:08
Show Gist options
  • Save juancarloscruzd/8988d08e596a1cebe7c6953bb16334db to your computer and use it in GitHub Desktop.
Save juancarloscruzd/8988d08e596a1cebe7c6953bb16334db to your computer and use it in GitHub Desktop.
Trigger Lambda function with SQS Queue as trigger
"use strict";
const AWS_REGION = process.env.AWS_REGION;
const Promise = require("bluebird");
const AWS = require("aws-sdk");
const eventUtils = require("./eventUtils.js");
AWS.config.update({ region: AWS_REGION });
AWS.config.setPromisesDependency(Promise);
class Dispatcher {
constructor() {
this.PUBLISHED_QUEUE_URL = process.env.PUBLISHED_QUEUE_URL;
this.AWS_ACCOUNTID = process.env.AWS_ACCOUNTID;
this.sns = undefined;
this.sqs = undefined;
}
init() {
this.sns = new AWS.SNS();
this.sqs = new AWS.SQS();
}
//--------------------------------------------------------
// --- Dispatches the event to the topic corresponding to it's type
//--------------------------------------------------------
dispatchEvent(event, topic) {
var params = {
TopicArn:
"arn:aws:sns:" + AWS_REGION + ":" + this.AWS_ACCOUNTID + ":" + topic,
Subject: event.eventType,
Message: eventUtils.stringify(event)
};
return this.sns.publish(params).promise();
}
//--------------------------------------------------------
// --- Dispatches all the events
//--------------------------------------------------------
dispatchAll(events) {
return Promise.all(
events.map(() => this.dispatchEvent(event, event.eventType))
);
}
}
exports.Dispatcher = Dispatcher;
//----------------------------
// --- Handles the incoming event from SQS
//----------------------------
exports.handler = function(sqsEvent, context, callback) {
let dispatcher = new Dispatcher();
dispatcher.init();
const events = sqsEvent.Records.filter(event =>
eventUtils.getOriginal(JSON.parse(event.body))
);
dispatcher
.dispatchAll(events)
.then(data => {
callback(undefined, data);
})
.catch(callback);
};
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment