Using NigthmareJS on AWS Lambda

index.js

'use strict';


// Code in global scope (outside of event) runs once, when container is first created


var pack = require('./lib/nightmare-lambda-pack');
var electronPath = pack.installNightmare();   // this will install the electron on the Lambda
var Xvfb    = require('./lib/xvfb');



var Snapper = require('./lib/nightmare-snapper');


exports.handler = function(event, context){
    
    // how do I know that by the time this was run, the pack was installed? 
    var url, xvfb, snapper;
    
    if ( !event.url ){
        context.done('Error please specify .url property on the event');
        return;
    }
    
    url = event.url;

    xvfb = new Xvfb({
        xvfb_executable : '/tmp/app/Xvfb' // will be part of package together with Electron
    })

    xvfb.start((err, xvfbProcess) => {

        if (err){
            console.error('Error starting xvfb', err);
            return context.done(err);
        }

        snapper = new Snapper({
            destBucket: 'rojet', 
            destBucketRegion: 'eu-west-1', // this is used to generate full screenshot url in form http://s3-region.amazonaws.com/key/screenshot-xxxx.png,
            nightmareOptions: {
                electronPath: electronPath
            }
        });
        

        snapper.snap({ url: url })
            .then((result) => {
                console.log(result);
                stopXvfbAndFinish(null, result);
            }
            , (err) => {
                console.error(err);
                stopXvfbAndFinish(err);
            });



        function stopXvfbAndFinish(err, result){
            xvfb.stop((err) => {
                context.done(err, result);
            }); 
        }


    });
    

    
    
}