server.js

// importing required packages and modules
const cors = require(`cors`);
const express = require(`express`);
const morgan = require(`morgan`);
const { logSuccess, logInfo, logWarning, logError } = require(`./dependencies/helpers/console.helpers`);
const { connectDatabase, disconnectDatabase } = require(`./dependencies/helpers/database.helpers`);

// importing required config params
const { server_MODE, NODE_PORT, MAX_FILE_SIZE_ALLOWED_BYTES, HTTP_STATUS_CODES: { SUCCESS } } = require(`./dependencies/config`);

// importing required routers
const { systemRoleRouter } = require(`./api/routers/system-role.router`);
// REMIANING ROUTERS GO HERE



// creating an instance of express server
const server = express();



// initializing server
(async () => {

  try {

    // Listening requests on the specified PORT
    server.listen(NODE_PORT, logInfo(`Initializing server in ${server_MODE} mode. Please wait.`));

    // declaring globals
    global.CONNECTED_CLIENTS = {};

    // 1-> middleware for handling cors
    // 2-> middleware to log requests to the console
    // 3-> middleware to parse json request body
    // 4-> middleware to parse urlencoded request data
    server.use(cors());
    server.use(morgan(`dev`));
    server.use(express.json({ limit: MAX_FILE_SIZE_ALLOWED_BYTES, verify: (req, res, buf) => req.rawBody = buf }));
    server.use(express.urlencoded({ extended: false }));

    // api handlers
    server.use(`/api/system-roles`, systemRoleRouter); // validation done
    // LIST OF API HANDLERS GO HERE

    // creating test route
    server.get(`/`, (req, res, next) => res.status(SUCCESS).send(`|| Service is UP & RUNNING in ${server_MODE} mode ||`));



    // making connection to database
    await connectDatabase();



    // logging message to the console
    logInfo(`Server is running @ port ${NODE_PORT}.`);

  } catch (error) {
    // this code runs in case of an ERROR @ runtime

    // logging error message to the console
    logError(`ERROR @ Server Initialization Process.`, error);

  }

})();



// disconnecting from the database instance before killing
// the process
process.on(`SIGINT`, async () => {

  // disconnecting server from database
  await disconnectDatabase();

});