xtpor/mongo-testing.js

## mongo-testing.js
var http = require('http');
var url  = require('url');
var MongoClient = require('mongodb').MongoClient;
var assert = require('assert');
var ObjectId = require('mongodb').ObjectID;
var mongourl = 'mongodb://developer:developer123@ds131963.mlab.com:31963/fyp2018';

var server = http.createServer(async function (req, res) {
    console.log(`INCOMING REQUEST: ${req.method} ${req.url}`);

    const parsedURL = url.parse(req.url, true);
    const queryAsObject = parsedURL.query;

    const handler = (function () {
        switch(parsedURL.pathname) {
            case '/displayPeople':
                return handlerPrintAllPeople

            case '/info':
                return handlerPrintUserInfo

            default:
                return handlerNotFound
        }
    })()

    let db
    try {
        db = await MongoClient.connect(mongourl)
        const result = await handler(db, parsedURL.query)
        const contentType = result.contentType || "text/html"
        const status = result.status || 200
        const response = result.response || ""

        res.writeHead(status, contentType)
        res.end(response)
    } catch (e) {
        console.error(e)
        res.writeHead(500, {"Content-Type": "text/plain"})
        res.write("500 Server Internal Error" + "\n");
        res.write(e.message + "\n")
        res.write(e.stack + "\n")
        res.end()
    } finally {
        db.close()
    }
})

async function handlerPrintAllPeople(db){
    const people = await db.collection("fyp2018").find().toArray()

    if (people.length == 0) {
        return {status: 404, response: `
            <html>
                <body>
                    Records Not found!
                </body>
            </html>
            `}
    } else {
        let response = ""
        response += '<html><head><title>fyp2018</title></head>'
        response += '<body><H1>fyp2018</H1>'
        response += '<h2>Showing ' + people.length + ' documents </h2>'
        response += '<ol>'
        for (const person of people) {
            response += '<li><a href=/info?userid=' + person._id +'>' + person.username + '</a></li>'
        }
        response += '</ol>'
        response += '</body></html>'
        return {response}
    }
}

async function handlerPrintUserInfo(db, {userid: id}) {
    const data = await db.collection("fyp2018").findOne({_id: ObjectId(id)})

    if (data === null) {
        return {status: 404, response: `
            <html>
            <head>
                <title>Display User Information</title>
            </head>
            <body>
                User not found
            </body>
            </html>
        `}
    } else {
        return {response: `
        <html>
        <head>
            <title>Display User Information</title>
        </head>
        <body>
            <h1>Display User Information</h1>
            <h2>Showing ${data.username} information</h2>
            <p>Username: ${data.username}</p>
            <p>Sex: ${data.sex}</p>
            <p>Email: ${data.email}</p>
        </body>
        </html>
        `}
    }
}

async function handlerNotFound() {
    return {status: 404, response: "404 NOT FOUND", contentType: "text/plain"}
}

server.listen(process.env.PORT || 8099);
	var http = require('http');
	var url = require('url');
	var MongoClient = require('mongodb').MongoClient;
	var assert = require('assert');
	var ObjectId = require('mongodb').ObjectID;
	var mongourl = 'mongodb://developer:developer123@ds131963.mlab.com:31963/fyp2018';

	var server = http.createServer(async function (req, res) {
	console.log(`INCOMING REQUEST: ${req.method} ${req.url}`);

	const parsedURL = url.parse(req.url, true);
	const queryAsObject = parsedURL.query;

	const handler = (function () {
	switch(parsedURL.pathname) {
	case '/displayPeople':
	return handlerPrintAllPeople

	case '/info':
	return handlerPrintUserInfo

	default:
	return handlerNotFound
	}
	})()

	let db
	try {
	db = await MongoClient.connect(mongourl)
	const result = await handler(db, parsedURL.query)
	const contentType = result.contentType \|\| "text/html"
	const status = result.status \|\| 200
	const response = result.response \|\| ""

	res.writeHead(status, contentType)
	res.end(response)
	} catch (e) {
	console.error(e)
	res.writeHead(500, {"Content-Type": "text/plain"})
	res.write("500 Server Internal Error" + "\n");
	res.write(e.message + "\n")
	res.write(e.stack + "\n")
	res.end()
	} finally {
	db.close()
	}
	})

	async function handlerPrintAllPeople(db){
	const people = await db.collection("fyp2018").find().toArray()

	if (people.length == 0) {
	return {status: 404, response: `
	<html>
	<body>
	Records Not found!
	</body>
	</html>
	`}
	} else {
	let response = ""
	response += '<html><head><title>fyp2018</title></head>'
	response += '<body><H1>fyp2018</H1>'
	response += '<h2>Showing ' + people.length + ' documents </h2>'
	response += '<ol>'
	for (const person of people) {
	response += '<li><a href=/info?userid=' + person._id +'>' + person.username + '</a></li>'
	}
	response += '</ol>'
	response += '</body></html>'
	return {response}
	}
	}

	async function handlerPrintUserInfo(db, {userid: id}) {
	const data = await db.collection("fyp2018").findOne({_id: ObjectId(id)})

	if (data === null) {
	return {status: 404, response: `
	<html>
	<head>
	<title>Display User Information</title>
	</head>
	<body>
	User not found
	</body>
	</html>
	`}
	} else {
	return {response: `
	<html>
	<head>
	<title>Display User Information</title>
	</head>
	<body>
	<h1>Display User Information</h1>
	<h2>Showing ${data.username} information</h2>
	<p>Username: ${data.username}</p>
	<p>Sex: ${data.sex}</p>
	<p>Email: ${data.email}</p>
	</body>
	</html>
	`}
	}
	}

	async function handlerNotFound() {
	return {status: 404, response: "404 NOT FOUND", contentType: "text/plain"}
	}

	server.listen(process.env.PORT \|\| 8099);