Develop Reference

Using Websocket and http server together

I am using websocket and http server together, assigning each of them a different port, when a post request hits it sends a message to client using websocket and response of http request is send when client responds to the message.
My problem is I want to create multiple websockets but a single https server, I have tried some things but unable to do it.
Current code for creating websocket and httpserver is
const app = require('express')()
bodyParser = require('body-parser')
app.use(bodyParser.json())
const net = require('net');
var client;
var res1,currentReq;
//----------------------------------------------------------------------------
// http requests listener
//----------------------------------------------------------------------------
app.listen(8001, () => console.log('Http server listening on port 8001'));
//----------------------------------------------------------------------------
// http requests handling
//----------------------------------------------------------------------------
app.post('/getUser', (req, res) => {
console.log(req.body)
res1 = res;
currentReq='getUser';
client.write('{"route":"/","data":{"username":"' + req.body.username +'"}, "res": "' + res + '"}');
//res.end('{"Extension":"' +' data '+ '"}');
console.log("/getUser finished");
// res.end('{"Extension":"' +' data '+ '"}');
});
//----------------------------------------------------------------------------
// Establishing tcp connection for incoming requests
//----------------------------------------------------------------------------
var server = net.createServer(function(connection) {
console.log ('client has connected successfully!');
client = connection;
client.on('data',function(data){
switch(currentReq)
{
case 'getUser' :
console.log('send get user response');
res1.end(data);
break;
}
console.log(data.toString());
//res1.end(data);
});
connection.pipe(connection);
});
//----------------------------------------------------------------------------
// listener for tcp connections
//----------------------------------------------------------------------------
server.listen(8000, function() {
console.log('server for localhost is listening on port 8000');
console.log('server bound address is: ' + server.address ());
});

Getting a 404/405 error while making a post request from front end AJAX to a given route in node Js. The localhost URL doesn't work

I want to load data from database as soon as page loads at front end, therefore I specified the route as '/' in GET. I am able to get the records in the console but my page doesn't load at http://127.0.0.1:3000. Here is a snap of the way I am creating server through node:
Yes I actually ran my server side through node app.js before creating this server
Moreover, even if it opens, and when I try to make a POST request to '/details' route, I get http 405 error. Here is a snap of my index.html where I am making an AJAX request:
In other ways, if I specify route as '/' in node Js and then make a request to '/', it inserts the record the way I want to.
I am quite new to AJAX and node Js. Can someone tell me where am I going wrong?
Here is my entire server side code:
const fetchOptions = {
headers: {
'Content-Type': 'application/json'
},
mode: 'cors'
};
var http=require("http");
var mysql=require("mysql");
var express=require('express');
var fs=require('fs');
var bodyParser=require('body-parser');
var app=express();
app.use(express.static('public'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({extended:true}));
console.log('Creating the http server');
var con= mysql.createConnection({
host: "localhost",
user: "root",
password: "root",
database: "budget_mgmt"
});
con.connect(function(err){
if(err)
{
console.log('Error connecting to db');
return;
}
console.log('Connection established');
});
var statement= "select * FROM budget_mgmt.item_description";
app.get('/',function(request,response)
{
fs.readFile('index.html',function(err,data)
{
console.log("The home page: index.html");
});
con.query(statement,function(error,results, fields)
{
if(error) throw error;
console.log(results);
response.end(JSON.stringify(results));
}); //response.end(data);
});
app.post('/details',function(request,response)
{
console.log(request.body);
console.log(request.body.description);
console.log(request.body.category);
console.log(request.body.amount);
console.log(request.body.date);
var sql = "INSERT INTO item_description(description,category,amount,today) VALUES ('"
+request.body.description+"','"+request.body.category+"',"+request.body.amount+","+"date_format(str_to_date('"+request.body.date+
"','%m-%d-%Y'),'%Y-%m-%d'));";
con.query(sql, function (err, result) {
if (err) throw err;
console.log("1 record inserted");
});
http.createServer(app).listen(3000,"127.0.0.1");

Can't Get The Php Variable To My Node Js using npm: exec-php module

Following is the Server.js File, here I am Fetching The Details From Table which working Good. I need to Get a Variable From k.php which is in the Same Folder.Iam using npm exec-php module to get the Values From Php File. But The Variable is Showing Undefined.
var app = require('http').createServer(handler),
io = require('socket.io').listen(app),
fs = require('fs'),
express=require('express'),
session=require('express-session'),
mysql = require('mysql'),
execPhp = require('exec-php'),
connectionsArray = [],
connection = mysql.createConnection({
host: 'localhost',
user: 'root',
password: '',
database: 'test',
port: 3306
}),
POLLING_INTERVAL = 3000,
pollingTimer;
// If there is an error connecting to the database
connection.connect(function(err) {
// connected! (unless `err` is set)
if (err) {
console.log(err);
}
});
// creating the server ( localhost:8000 )
app.listen(8000);
// on server started we can load our client.html page
function handler(req, res) {
fs.readFile(__dirname + '/client.php', function(err, data) {
if (err) {
console.log(err);
res.writeHead(500);
return res.end('Error loading client.php');
}
res.writeHead(200);
res.end(data);
});
}
execPhp('k.php', function(error, php, outprint){
// Here I expected The outprint Will be 'One' but it print undefined
console.log(outprint);
php.my_function(1, 2, function(err, result, output, printed){
//this my_function is also showing Error
});
});
var pollingLoop = function() {
// Doing the database query
var query = connection.query('SELECT * FROM users where user_id=1'),
users = []; // this array will contain the result of our db query
// setting the query listeners
query
.on('error', function(err) {
// Handle error, and 'end' event will be emitted after this as well
console.log(err);
updateSockets(err);
})
.on('result', function(user) {
// it fills our array looping on each user row inside the db
users.push(user);
})
.on('end', function() {
// loop on itself only if there are sockets still connected
if (connectionsArray.length) {
pollingTimer = setTimeout(pollingLoop, POLLING_INTERVAL);
updateSockets({
users: users
});
} else {
console.log('The server timer was stopped because there are no more socket connections on the app')
}
});
};
// creating a new websocket to keep the content updated without any AJAX request
io.sockets.on('connection', function(socket) {
console.log('Number of connections:' + connectionsArray.length);
// starting the loop only if at least there is one user connected
if (!connectionsArray.length) {
pollingLoop();
}
socket.on('disconnect', function() {
var socketIndex = connectionsArray.indexOf(socket);
console.log('socketID = %s got disconnected', socketIndex);
if (~socketIndex) {
connectionsArray.splice(socketIndex, 1);
}
});
console.log('A new socket is connected!');
connectionsArray.push(socket);
});
var updateSockets = function(data) {
// adding the time of the last update
data.time = new Date();
console.log('Pushing new data to the clients connected ( connections amount = %s ) - %s', connectionsArray.length , data.time);
// sending new data to all the sockets connected
connectionsArray.forEach(function(tmpSocket) {
tmpSocket.volatile.emit('notification', data);
});
};
console.log('Please use your browser to navigate to http://localhost:8000');
the main Problem is in these Lines
execPhp('k.php', function(error, php, outprint){
// Here I expected The outprint Will be 'One' but it print undefined
console.log(outprint);
php.my_function(1, 2, function(err, result, output, printed){
//this my_function is also showing Error
});
});
The Following is k.php in the same folder
<?php
echo "One";
function my_function($arg1, $arg2){
echo "Two";
return $arg1 + $arg2;
}
?>
This is the Error

socket.io doesn't receive data

I have a simple client server web app that is using web sockets to send / receive information. The client can connect and receives properly the config file but then when I try to send a "test' message from the client using "socket.emit('message', {my: 'data'});" it doesn't display on the server. I did check with wireshark and the packets are arriving at the server.
var sIoPort = 8181;
var host = '192.168.4.111';
var fs = require('fs');
var iniMsg = fs.readFileSync('data.json','utf8');
var http = require("http").createServer(function (req, res) {
res.writeHead(200, {'Content-Type': 'text/html'});
res.end(index);
});
http.listen(sIoPort,host);
var browserServer = require('socket.io').listen(http);
browserServer.on('connection', function (socket) {
console.log('Client websocket connected');
// send the config file if available
browserServer.sockets.emit('msg',iniMsg.toString());
});
browserServer.on('message', function (message) {
console.log('received message: ' + message);
});
client side
///////////////////////////////////////////////////////////////////////////////
socket = io.connect("192.168.4.111",{"port":8181});
socket.on('connect',function() {if(DEBUG) console.log('Socket Connected');});
socket.emit('message', {my: 'data'}); // test if server receives message
socket.on('msg',function(data) {
var json = JSON.parse(data);
// add the maps to the the GUI
switch(json.type) {
case 'maps': add_maps_from_json(json, null);
break;
}
});
socket.on('disconnect',function() {if(DEBUG) console.log('Socket Disconnected');});
/////////////////////////////////////////////////////////////////////////////////

Modify the serverside listener so it's paying attention to events on a socket:
browserServer.on('connection', function (socket) {
console.log('Client websocket connected');
// send the config file if available
browserServer.sockets.emit('msg',iniMsg.toString());
socket.on('message', function (message) {
console.log('received message: ' + message);
});
});

Connecting to MS SQL DB with node.js + functions()

I am trying to connect to a MS SQL Server DB using node.js. I installed the msnodesql module to use for this task. I am able to connect to a DB with the following code:
var sql = require('msnodesql');
var util = require('util');
//
var connStr = "Driver={SQL Server Native Client 11.0};Server=myySqlDb,1433;Database=DB;UID=Henry;PWD=cat;";
var query = "SELECT * FROM GAData WHERE TestID = 17";
sql.open(connStr, function(err,conn){
if(err){
return console.error("Could not connect to sql: ", err);
}
conn.query(query,function(err,results){
if (err){
return console.error("Error running query: ", err);
}
console.log(results);
console.log(results.length);
for (var i = 0; i <= results.length; i++){
util.inspect(results[i]);
}
});
});
My goal however is to connect to the DB from various events, such as button submits, from a HTML page. From the button click I want to call a node.js function to query the DB for a particular attribute, such as the following:
From the HTML:
<br /><button type="submit" id="continue" onClick="verifyEmail($('#email').val())">Continue</button>
From the script file:
function verifyEmail(email){
var mQuery = "'EXEC WebUserRecovery '" + email + "'";
sql.open(conn_str, function (err, conn) {
if (err) {
console.log("Error opening the connection!\r\n" + err);
return;
}
connection.query(mQuery,function(err,results){
if (err){
return console.error("Error running query: ", err);
}
alert(results);
});
});
}
The code when put inside the function does not work, a DB connection is unsuccessful. Can anyone advise how to fix this issue? There is little good documentation on msnodesql out there...

Server side .js file (Node.js):
var sql = require('msnodesql');
var util = require('util');
var connStr = "Driver={SQL Server Native Client 11.0};Server=myySqlDb,1433;Database=DB;UID=Henry;PWD=cat;";
var query = "SELECT * FROM GAData WHERE TestID = 17";
// Load the http module to create an http server.
var http = require('http');
// Configure our HTTP server to respond with Hello World to all requests.
var server = http.createServer(function (request, response) {
sql.open(connStr, function(err,conn){
if(err){
return console.error("Could not connect to sql: ", err);
}
conn.query(query,function(err,results){
if (err){
return console.error("Error running query: ", err);
}
response.writeHead(200, {"Content-Length": results.length});
response.writeHead(200, {"Content-Type": "application/json"});
response.end(results);
});
});
});
// Listen on port 8000, IP defaults to 127.0.0.1
server.listen(8000);
// Put a friendly message on the terminal
console.log("Server running at http://127.0.0.1:8000/");
At Client Side .js file or in-line script should be something like following using jQuery ajax call:
var request = $.ajax({
url: "http://127.0.0.1:8000/",
type: "GET",
dataType: "json"
});
request.done(function(dataRcvd) {
alert(JSON.stringify(dataRcvd));
});