server.js

//
// Main Express server for nodejs-demoapp
// ---------------------------------------------
// Ben C, Oct 2017 - Updated: Apr 2019
//

console.log(`### Node.js demo app starting...`);

// Dotenv handy for local config & debugging
require('dotenv').config()

// App Insights. Set APPINSIGHTS_INSTRUMENTATIONKEY as App Setting or env var
if(process.env.APPINSIGHTS_INSTRUMENTATIONKEY) {
  const appInsights = require("applicationinsights");
  appInsights.setup()
  .setAutoDependencyCorrelation(true)
  .setAutoCollectRequests(true)
  .setAutoCollectPerformance(true)
  .setAutoCollectExceptions(true)
  .setAutoCollectDependencies(true)
  .setAutoCollectConsole(true, true)
  .setUseDiskRetryCaching(true)
  .setSendLiveMetrics(true);

  appInsights.start();
}

// Core Express & logging stuff
const express = require('express');
const path = require('path');
const logger = require('morgan');
const bodyParser = require('body-parser');
const app = express();

// View engine setup & static content 
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');
app.use(express.static(path.join(__dirname, 'public')));

// Logging
app.use(logger('dev'));

// Parsing middleware
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));

// Initialize Passport and AAD authentication 
if(process.env.AAD_APP_ID) require('./auth/init')(app)

// Routes
app.use('/', require('./routes.js'));
if(process.env.TODO_MONGO_CONNSTR) app.use('/', require('./todo/routes'));
app.use('/', require('./auth/routes'));

// Make package app version a global var, shown in _foot.ejs
app.locals.version = require('./package.json').version;

// Catch all route, generate an error & forward to error handler
app.use(function(req, res, next) {
  var err = new Error('Not Found');
  err.status = 404;
  if(req.method != 'GET') { 
    err = new Error(`Method ${req.method} not allowed`);
    err.status = 500;
  }
  
  next(err);
});

// Error handler
app.use(function(err, req, res, next) {
  console.error(`### ERROR: ${err.message}`);
  
  // App Insights
  const appInsights = require("applicationinsights");    
  if(appInsights.defaultClient) appInsights.defaultClient.trackException({exception: err});

  // Render the error page
  res.status(err.status || 500);
  res.render('error', {
    title: 'Error', 
    message: err.message,
    error: err
  });
});

// Get values from env vars or defaults where not provided
var port = process.env.PORT || 3000;

// Start the server
app.listen(port);
console.log(`### Server listening on port ${port}`);

module.exports = app;