Small boilerplate for the next project using async.waterfall

pdf-soap.js

var async = require('async'),
    open  = require('open');

async.waterfall([
    async.constant({
        output: './pba.pdf'
    }),
    loadRequest,
    loadResponse,
    extractPdf,
    savePdf,
    showPdf
], function(err, result){
    if(err) console.error(err);
});

/* Load request xml from file system */
function loadRequest(options, callback) {
    console.log('Loaded request xml from file system');
    callback(null, options, '<xml/>');
}
/* Load response xml from SOAP service */
function loadResponse(options, request, callback) {
    console.log('Loaded response xml from SOAP service');
    callback(null, options, '<xml/>');
}
/* Extract pdf from response xml */
function extractPdf(options, response, callback) {
    var pdf = 'ABCDEF0123456789';
    console.log('Extracted pdf from response xml');
    callback(null, options, pdf);
}
/* Save extracted pdf to file system */
function savePdf(options, pdf, callback) {
    console.log('Saved extracted pdf to file system');
    callback(null, options);
}
/* Show extracted pdf  */
function showPdf(options, callback) {
    console.log('Showed pdf using default viewer');
    open(options.output);
    callback(null, options, 'Done!');
}