server.js

/*
 * This require() statement reads environment variable values from the file
 * called .env in the project directory.  You can set up the environment
 * variables in that file to specify connection information for your own DB
 * server.
 */
require('dotenv').config()
const express = require('express')
const morgan = require('morgan')

const api = require('./api')
const { connectToDb } = require('./lib/mongo')
const { redisClient } = require('./lib/redis')

const app = express()
const port = process.env.PORT || 8000


/*  
 *  Run mongoDB server:
 *    docker run -d --name mongo-server -p "27017:27017" -e "MONGO_INITDB_ROOT_USERNAME=root" -e "MONGO_INITDB_ROOT_PASSWORD=password" -e "MONGO_INITDB_DATABASE=Tarpaulin"  mongo:latest
 */


/*
 * Morgan is a popular request logger.
 */
app.use(morgan('dev'))

app.use(express.json())

/*
 * All routes for the API are written in modules in the api/ directory.  The
 * top-level router lives in api/index.js.  That's what we include here, and
 * it provides all of the routes.
 */
app.use('/', api)

app.use('*', function (req, res, next) {
  res.status(404).json({
    error: "Requested resource " + req.originalUrl + " does not exist"
  })
})

/*
 * This route will catch any errors thrown from our API endpoints and return
 * a response with a 500 status to the client.
 */
app.use('*', function (err, req, res, next) {
  console.error("== Error:", err)
  res.status(500).send({
      err: "Server error.  Please try again later."
  })
})

/*
 * Start the API server listening for requests after establishing a connection
 * to the MongoDB server & the redis server.
 */
connectToDb(async function () {
  redisClient.connect().then(function () {
    app.listen(port, function () {
          console.log("== Server is running on port", port)
    })
  })
})