Simple database server

simple-server-recurse

/* 

Before your interview, write a program that runs a server that is accessible on http://localhost:4000/. When your server receives a request on http://localhost:4000/set?somekey=somevalue it should store the passed key and value in memory. When it receives a request on http://localhost:4000/get?key=somekey it should return the value stored at somekey.

During your interview, you will pair on saving the data to a file. You can start with simply appending each write to the file, and work on making it more efficient if you have time.

http://localhost:4000/set?name=harold
http://localhost:4000/get?key=name
*/

var http = require('http');
var url = require('url');
var fs = require('fs');

var file = './kv_store.json';
var data = require(file);

// create object and save key value pairs
var db = {
    setKeyVal: function(key, val){
        this[key] = val;
    },
    getVal: function(key){
        return this[key];
    }
}

http.createServer(function(req, res){

	// parse the url so it's returned as an object
	// and allows access to its data
	var objUrl = url.parse(req.url, true);

	// controllers
	if(objUrl.pathname === '/set' && req.method == 'GET'){
		// SET route

		// loop through objects' keys and load into memory
		Object.keys(objUrl.query).forEach(function(key){
			var value = objUrl.query[key];
			db.setKeyVal(key, value);
		});

		// take the query straight from the url
		var content = JSON.stringify(objUrl.query);
		// create a file and pass the database content into it
		fs.writeFile(file, JSON.stringify(db), null, function(err){
			console.log(db)
		});
		// append new content to file ... synchronously so as not to get multiple objects in file
		fs.appendFileSync(file, content, null);
		console.log(content);

		var resObj = {
		    success : 'Updated Successfully'
		}
		res.writeHead(200, {'Content-Type': 'application/json'});
		res.end(JSON.stringify(resObj));
	
	} else if (objUrl.pathname === '/get' && req.method == 'GET') {
		// GET route
		var k, v;
		
		Object.keys(data).forEach(function(key){
			// console.log('line 65: ', k)
			k = JSON.stringify(data[key]);
		});

		console.log('line 68: ', k)
		
		// if not the key, return an error
		if(!k){
			var resObj = {
			    status  : 'error',
			    error : 'Invalid key'
			}
			res.writeHead(200, {'Content-Type':'application/json'});
			res.end(JSON.stringify(resObj));
		}
		
		// if the value is not a string, return an error

		Object.keys(data).forEach(function(value){
			v = data[value];
		});

		console.log('line 85: ', v);

		if(typeof v !== 'string'){
			var resObj = {
			    status  : 'error',
			    error : 'Key not found',
			}
			res.writeHead(200, {'Content-Type':'application/json'});
			res.end(JSON.stringify(resObj));
		}

		// if there is a successful request
		var resObj = {
		    status  : 'success',
		    data : v,
		}
		res.writeHead(200, {'Content-Type':'application/json'});
		res.end(JSON.stringify(resObj));

	} else {
		// route not defined
		var resObj = {
			"status": 404,
			"error": "404 Not Found"
		}
		res.writeHead(404, {'Content-Type':'application/json'});
		res.end(JSON.stringify(resObj));
	}

}).listen(4000);

console.log('Magic is happening on port 4000');