Core synchronous queue with an example worker

app.js

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+const dotenv = require('dotenv')
+const compression = require('compression')
+const express = require('express')
+const morgan = require('morgan')
+const bodyParser = require('body-parser')
+const path = require('path')
+const rfs = require('rotating-file-stream')
+const cors = require('cors')
+const errorhandler = require('errorhandler')
+const statusCodes = require('http-status-codes').StatusCodes
+const createError = require('http-errors')
+
+const apiRouter = require('./routes')
+
+// load .env config file
+dotenv.config()
+
+// main app file
+const app = express()
+
+// create a rotating write stream
+const accessLogStream = rfs.createStream('access.log', {
+  interval: '1d', // rotate daily
+  path: path.join(__dirname, 'log')
+})
+
+// setup the file logger
+app.use(morgan('common', { stream: accessLogStream }))
+
+// setup the console logger
+if (process.env.NODE_ENV === 'development') {
+  // [debug]
+  app.use(morgan('dev'))
+} else {
+  // [production]
+  app.use(morgan('dev', {
+    skip: function (req, res) { return res.statusCode < 400 }
+  }))
+}
+
+// be proxy aware
+app.enable('trust proxy')
+
+// cross-origin resource sharing
+app.use(cors())
+
+// json middleware
+app.use(bodyParser.json())
+
+// healthcheck (can be used for heart-beat)
+app.get('/status', (req, res) => {
+  res.status(200).end()
+});
+app.head('/status', (req, res) => {
+  res.status(200).end()
+});
+
+// routes
+app.use('/api', apiRouter)
+
+// 404 middleware
+app.use((req, res, next) => {
+  next(createError(statusCodes.NOT_FOUND))
+})
+
+// error handling
+app.use((err, req, res, next) => {
+  /* Handle 401 */
+  if (err.status === statusCodes.UNAUTHORIZED) {
+    return res
+      .status(err.status)
+      .send({ message: err.message })
+      .end()
+  }
+  return next(err)
+})
+if (process.env.NODE_ENV !== 'development') {
+  app.use((err, req, res, next) => {
+    res.status(err.status || 500)
+    res.json({
+      errors: {
+        message: err.message,
+      },
+    })
+  })
+}
+
+// start the server
+app.listen(process.env.PORT, process.env.HOST)
+
+console.log('service started on port ' process.env.HOST + ':' + process.env.PORT)