app.js

const createError = require('http-errors');
const express = require('express');
const path = require('path');
const cookieParser = require('cookie-parser');
const logger = require('morgan');
const AWSXRay = require('aws-xray-sdk');

const db = require('./lib/db')
const peerCounts = require('./lib/peer-counts')

const indexRouter = require('./routes/index');

module.exports = async function () {
  await db.setup()
  peerCounts.start(db)
  var app = express();

  // view engine setup
  app.set('views', path.join(__dirname, 'views'));
  app.set('view engine', 'ejs');

  app.use(AWSXRay.express.openSegment('Userlist'));
  app.use(logger('dev'));
  app.use(express.json());
  app.use(express.urlencoded({ extended: false }));
  app.use(cookieParser());
  app.use(express.static(path.join(__dirname, 'public')));

  app.use('/', indexRouter);

  // catch 404 and forward to error handler
  app.use(function(req, res, next) {
    next(createError(404));
  });

  // error handler
  app.use(function(err, req, res, next) {
    // set locals, only providing error in development
    res.locals.message = err.message;
    res.locals.error = req.app.get('env') === 'development' ? err : {};

    // render the error page
    res.status(err.status || 500);
    res.render('error');
  });

  app.use(AWSXRay.express.closeSegment());

  return app
}