I am made a script that opens a tcp server and listens for incoming requests and then creates a windows notification. Here is the code:
const notifier = require('node-notifier');
const path = require('path');
const net = require('net');
const port = 7070;
const host = '';
const server = net.createServer();
server.listen(port, host, () => {
console.log('TCP Server is running on port ' + port + '.');
});
let sockets = [];
server.on('connection', function(sock) {
console.log('CONNECTED: ' + sock.remoteAddress + ':' + sock.remotePort);
sockets.push(sock);
sock.on('data', function(data) {
var tryCatch = true;
try {
JSON.parse(data);
} catch (err) {
tryCatch = err;
}
if (tryCatch == true) {
var JSONdata = JSON.parse(data);
if (JSONdata["action"] == "notification") {
notifier.notify({
title: 'Recived Message',
message: JSONdata["message"],
icon: path.join(__dirname, 'icon.png'),
actions: ["OK", "Abbrechen"]
},
(err, data) => {
console.log('Waited');
console.log(JSON.stringify({ err, data }));
sock.write(JSON.stringify({ err, data }));
sock.write('\r');
sock.destroy();
}
);
} else if (JSONdata["action"] == "closeServer") {
sock.destroy();
server.close();
}
} else {
sock.write(tryCatch.message);
sock.destroy();
}
});
// Add a 'close' event handler to this instance of socket
sock.on('close', function(data) {
let index = sockets.findIndex(function(o) {
return o.remoteAddress === sock.remoteAddress && o.remotePort === sock.remotePort;
})
if (index !== -1) sockets.splice(index, 1);
console.log('CLOSED: ' + sock.remoteAddress + ' ' + sock.remotePort);
// server.close();
});
});
That script works without a problem. Now i want to connect it with my electron app. I want to access the electron app from this npm process to for example open a page. But i don't know how to access the electron process from outside and by outside i mean from another npm process. Hope someone could help me or point me in the right direction. I am thankful for every answer or info.
Simple to say. I didnt find a solution on how to access another proccess but instead you can just vorbidd or intercept and interrupt if the user tries to open another window. Then you can instead spawn your own window and use the ipcMain and ipcRender modules to send smth to the requried window.
Related
I'm using the net module to create a listener but I've experienced some issues. I'm trying to make it wait till it's done writing the "text" to the client before the client can type again. If I'm not doing this and I hold in enter it'll just make you able to write enters between text leading to weird formatting etc.
So how could I make it wait till it's written to the client?
Code:
const net = require('net');
const server = new net.Server();
server.on('connection', async function (socket) {
console.log("Client connected!");
socket.on('data', async function (data) {
socket.setEncoding('utf8');
let input = data.toString().replace(/(\r\n|\n|\r)/gm, "");
if (input == "echo")
socket.write("$ ");
else
socket.write("invalid command");
});
});
server.listen(1337, function() {
console.log("listening");
});
Picture:
https://imgur.com/a/lc21Y13
Edit:
This is on localhost, let's say I'd host it on a server so there's a higher ping it's way worse.
Edit:
Here a picture from when it's hosted on a server:
https://imgur.com/a/LIKRRr9
Edit:
I've tried using SSH instead of telnet and raw and got basically the same result now.
Picture:
https://imgur.com/a/XJmpGSa
Code:
var fs = require('fs');
var username = null;
var ssh2 = require('ssh2');
new ssh2.Server({
hostKeys: [fs.readFileSync('ssh.key')]
}, function (client) {
console.log('Client connected!');
client.on('authentication', function (ctx) {
if (ctx.method !== 'password') return ctx.reject(['password']);
if (ctx.method === 'password') {
username = ctx.username;
console.log(username);
console.log(ctx.password);
ctx.accept();
}
else {
console.log("rejected.");
ctx.reject();
}
}).on('ready', function () {
console.log('Client authenticated!');
client.on('session', function (accept, reject) {
var session = accept();
session.once('shell', function (accept, reject, info) {
var stream = accept();
stream.write("$ ");
stream.on('data', function (data) {
var args = data.toString().split(" ");
console.log(args);
switch (args[0]) {
case "echo":
args.shift();
stream.write(args.join(" ") + "\r\n");
break;
case "whoami":
stream.write(username + "\r\n");
break;
case "exit":
stream.exit(0);
stream.end();
stream = undefined;
break;
default:
stream.stderr.write(args[0] + ": No such command!\r\n");
break;
}
if (typeof stream != 'undefined') {
stream.write("$ ");
}
});
});
});
}).on('end', function () {
console.log('Client disconnected');
});
}).listen(1337, function () {
console.log('Listening on port ' + this.address().port);
});
Try This. What this code does is simply buffering until \n enter is received from a client.
const net = require("net");
const readline = require("readline");
const execCommand = (command, args, socket) => {
return new Promise((res, rej) => {
setTimeout(() => {
// to clear the terminal
socket.write("\u001B[2J\u001B[0;0f");
socket.write(
`Executed command: ${command} with args: ${args} and result was: ${Math.random()}`
);
socket.write('\n>')
res();
}, 3000);
});
};
const server = net.createServer((socket) => {
socket.write("Connected");
// nice prompt
socket.write("\n>");
const rl = readline.createInterface({
input: socket,
output: socket,
});
rl.on("line", (line) => {
if (line.length === 0) {
socket.write("No command to execute!");
socket.write('\n>')
return;
}
// destructuring command and args
// E.g. command arg1 arg2 ....
const [command, ...args] = line.split(" ");
execCommand(command, args, socket);
});
});
server.listen(1337, "127.0.0.1");
I am making the chat application using socket (which I'm new at) with multiple tenants structure and using namespaces. Here's my code:
Socket server:
index.js
class Server {
constructor() {
this.port = process.env.PORT || 3000;
this.host = process.env.HOST || `localhost`;
this.app = express();
this.http = http.Server(this.app);
this.rootSocket = socketio(this.http);
}
run() {
new socketEvents(this.rootSocket).socketConfig();
this.app.use(express.static(__dirname + '/uploads'));
this.http.listen(this.port, this.host, () => {
console.log(`Listening on ${this.host}:${this.port}`);
});
}
}
const app = new Server();
app.run();
socket.js
var redis = require('redis');
var redisConnection = {
host: process.env.REDIS_HOST,
password: process.env.REDIS_PASS
};
var sub = redis.createClient(redisConnection);
var pub = redis.createClient(redisConnection);
class Socket {
constructor(rootSocket) {
this.rootIo = rootSocket;
}
socketEvents() {
/**
* Subscribe redis channel
*/
sub.subscribe('visitorBehaviorApiResponse');
//TODO: subscribe channel..
// Listen to redis channel that published from api
sub.on('message', (channel, data) => {
data = JSON.parse(data);
console.log(data);
const io = this.rootIo.of(data.namespace);
if (channel === 'visitorBehaviorApiResponse') {
io.to(data.thread_id).emit('receiveBehavior', data);
io.to('staff_room').emit('incomingBehavior', data);
}
})
sub.on('error', function (error) {
console.log('ERROR ' + error)
})
var clients = 0;
this.rootIo.on('connection', (rootSocket) => {
clients++;
console.log('root:' + rootSocket.id + ' connected (total ' + clients + ' clients connected)');
const ns = rootSocket.handshake['query'].namespace;
// Dynamic namespace for multiple tenants
if (typeof (ns) === 'string') {
const splitedUrl = ns.split("/");
const namespace = splitedUrl[splitedUrl.length - 1];
const nsio = this.rootIo.of(namespace);
this.io = nsio;
this.io.once('connection', (socket) => {
var visitors = [];
console.log('new ' + socket.id + ' connected');
// once a client has connected, we expect to get a ping from them saying what room they want to join
socket.on('createChatRoom', function (data) {
socket.join(data.thread_id);
if (typeof data.is_staff !== 'undefined' && data.is_staff == 1) {
socket.join('staff_room');
} else {
if (visitors.some(e => e.visitor_id === data.visitor_id)) {
visitors.forEach(function (visitor) {
if (visitor.visitor_id === data.visitor_id) {
visitor.socket_ids.push(socket.id);
}
})
} else {
data.socket_ids = [];
data.socket_ids.push(socket.id);
visitors.push(data);
}
socket.join('visitor_room');
}
//TODO: push to redis to check conversation type
});
socket.on('sendMessage', function (data) {
console.log(data);
pub.publish('chatMessage', JSON.stringify(data));
this.io.in(data.thread_id).emit('receiveMessage', data);
this.io.in('staff_room').emit('incomingMessage', data);
// Notify new message in room
data.notify_type = 'default';
socket.to(data.thread_id).emit('receiveNotify', data);
}.bind(this))
socket.on('disconnect', (reason) => {
sub.quit();
console.log('client ' + socket.id + ' left, ' + reason);
});
socket.on('error', (error) => {
console.log(error);
});
});
}
// Root disconnect
rootSocket.on('disconnect', function () {
clients--;
console.log('root:' + rootSocket.id + ' disconnected (total ' + clients + ' clients connected)');
});
});
}
socketConfig() {
this.socketEvents();
}
}
module.exports = Socket;
Client:
const server = 'https://socket-server'
const connect = function (namespace) {
return io.connect(namespace, {
query: 'namespace=' + namespace,
resource: 'socket.io',
transports: ['websocket'],
upgrade: false
})
}
const url_string = window.location.href
const url = new URL(url_string)
const parameters = Object.fromEntries(url.searchParams)
const socket = connect(`${server}/${parameters.shopify_domain}`)
var handleErrors = (err) => {
console.error(err);
}
socket.on('connect_error', err => handleErrors(err))
socket.on('connect_failed', err => handleErrors(err))
socket.on('disconnect', err => handleErrors(err))
The problem that I met is when socket server got a new connection, the existing connections will be stopped working util they make a page refreshing to reconnect a new socket.id.
And when a namespace's client emit data, it sends to other namespaces, seem my code is not work correctly in a namespace.
Could you take a look at my code and point me where I'm wrong?
Thanks
1) Get UserId or accessToken while handshaking(in case of accessToken decrypt it).
and store userID: socketId(in Redis or in local hashmap) depends upon the requirement .
2) When u are going to emit to particular user fetch the socketid to that userid from redis or local hashmap
and emit to it.
**io.to(socketId).emit('hey', 'I just met you');**
3) If you are using multiple servers use sticky sessions
4) Hope this will help you
I am using kafka-node to read stream data and pass it to my web app with Web Sockets using NodeJS. This works fine if I able to define the kafka producer server and the topic I am interested in, however for my use case the end users will input the kafka producer server and the topic and my NodeJS backend will be responsible to receive that request and to create the appropriate kafka/websocket connections.
My idea was the following:
Create a rest API to which the web app could send requests to in order to create a new kafka consumer/web socket connection (/registerTopic)
Save the new kafka consumers in a global array when I create a new kafka consumer so that I can later pause or resume the stream with another rest API call (/pauseTopic and /resumeTopic)
I ran into problems trying to move the WebSocket code into /registerTopic...Whenever I do this everything acts very strangely and I suddenly get 1000x messages at once and then 40-50x messages every second even though the kafka producer is only sending 1 message per second. Any ideas on how I can get this working?
const express = require("express");
const app = express();
const cors = require('cors');
const bodyParser = require('body-parser');
const fs = require('fs');
app.use(cors());
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));
var WebSocketServer = require('websocket').server;
var http = require('http');
var https = require('https');
var kafka = require('kafka-node');
var topics = [];
var privateKey = fs.readFileSync('PATH', 'utf8');
var certificate = fs.readFileSync('PATH', 'utf8');
var credentials = { key: privateKey, cert: certificate };
var consumers = new Set();
// This was working without any issues before I tried to make this dynamic!
/* var Consumer = kafka.Consumer,
client = new kafka.KafkaClient('localhost:9092'),
consumer = new Consumer(
client, [{ topic: 'numtest', partition: 0 }], { autoCommit: false }); */
var server = http.createServer(function (request, response) {
console.log(' Request recieved : ' + request.url);
response.writeHead(404);
response.end();
});
server.listen(8080, function () {
console.log('Listening on port : 8080');
});
webSocketServer = new WebSocketServer({
httpServer: server,
autoAcceptConnections: false
});
function iSOriginAllowed(origin) {
return true;
}
// This was working without any issues before I tried to make this dynamic!
/* webSocketServer.on('request', function (request) {
if (!iSOriginAllowed(request.origin)) {
request.reject();
console.log(' Connection from : ' + request.origin + ' rejected.');
return;
}
let connection = request.accept('echo-protocol', request.origin);
console.log(' Connection accepted : ' + request.origin);
connection.on('message', function (message) {
if (message.type === 'utf8') {
console.log('Received Message: ' + message.utf8Data);
}
});
consumer.on('message', function (message) {
console.log('msg');
connection.sendUTF(message.value);
});
connection.on('close', function (reasonCode, description) {
console.log('Connection ' + connection.remoteAddress + ' disconnected.');
});
}); */
var httpsServer = http.createServer(credentials, app);
httpsServer.listen(3000, () => {
console.log("Server running on port 3000");
});
app.get("/getTopics", (req, res, next) => {
res.json(topics);
});
app.post("/registerTopic", (req, res) => {
try {
var client = new kafka.KafkaClient(req.body.host);
var Consumer = kafka.Consumer;
consumer = new Consumer(
client, [{ topic: req.body.topic, partition: 0 }], { autoCommit: false });
let consumerExists = false;
for (let c = 0; c < [...consumers].length; c++) {
if ([...consumers][c].topic == req.body.topic && [...consumers][c].sessionId == req.body.sessionId) {
consumerExists = true;
}
}
if (!consumerExists) {
consumers.add({ 'topic': req.body.topic, 'sessionId': req.body.sessionId, 'consumer': consumer });
}
client.loadMetadataForTopics([], function (error, results) {
Object.keys(results[1].metadata).forEach(function (key) {
var value = results[1].metadata[key];
if (!value['0'].topic.includes('__') && !value['0'].topic.includes('offset')) {
topics.push({ 'producer': req.body.host, 'topic': value['0'].topic });
}
});
});
webSocketServer.on('request', function (request) {
if (!iSOriginAllowed(request.origin)) {
request.reject();
console.log(' Connection from : ' + request.origin + ' rejected.');
return;
}
let connection = request.accept('echo-protocol', request.origin);
console.log(' Connection accepted : ' + request.origin);
connection.on('message', function (message) {
if (message.type === 'utf8') {
console.log('Received Message: ' + message.utf8Data);
}
});
consumer.on('message', function (message) {
console.log('msg');
connection.sendUTF(message.value);
});
connection.on('close', function (reasonCode, description) {
console.log('Connection ' + connection.remoteAddress + ' disconnected.');
});
});
res.json("Working");
} catch (error) {
console.error(error);
res.status(400).send('Unable to register new topic')
}
});
app.post("/pauseTopic", (req, res) => {
try {
console.log(req.body);
let filteredConsumer = [...consumers].filter(function (item) {
console.log(req.body.topic, item.sessionId);
if (item.topic == req.body.topic && item.sessionId == req.body.sessionId) {
return c;
}
});
console.log(filteredConsumer);
//filteredConsumer[0].consumer.pause();
res.json("Working");
} catch (error) {
console.error(error);
res.status(400).send('Unable to register new topic')
}
});
app.post("/resumeTopic", (req, res) => {
try {
let filteredConsumer = [...consumers].filter(function (item) {
if (item.topic == req.body.topic && item.sessionId == req.body.sessionId) {
return item;
}
});
filteredConsumer[0].consumer.resume();
res.json("Working");
} catch (error) {
console.error(error);
res.status(400).send('Unable to register new topic')
}
});
My app has three modules:
WebSocket Module: resides on the remote server (internet) and it acts as a Websocket
server that entertain the connection between Client Module and
Webhook module.
Webhook Module: resides on the remote server (internet) and it acts as
a webhook to answer the HTTP post request from the user. It is connected to Websocket Module via websocket as well.
Client Module: resides on my local machine and it is connected to
the
Webhook model via websocket. This client responsible to get query
from my local backend.
When a user call Webhook Module through HTTP Post request, Webhook module initiate a connection to WebSocket module via websocket. Then, the WebSocket module initiate the connection to Client module and response back with the necessary information. Actually I have to do this to eliminate the HTTP tunnel that is blocked in my company.
The problem is, when I open two browser windows to perform the HTTP Post request at the same time with different parameter, for example, param "A", I would expect to get return "A", with param "B", I expect to get "B" not "A". But There is something wrong with my codes/design. If I executed at the same time, I throw "A" then I got "B" which is wrong. How do I overcome this.
This is a simple diagram to illustrate it.
WebSocket Module:
'use strict'
//This is WebSocket Server
const clients = {};
const SocketIO = require('socket.io');
const express = require('express');
const http = require('http');
const app = express();
const server = http.createServer(app);
const ws = SocketIO(server);
const port = 3000;
var clientid;
ws.on('connection', (client) => {
clients[client.id] = client;
console.log('new connection', client.id);
clientid = client.id;
client.emit('message', { message: 'welc' })
client.on('disconnect', () => {
delete clients[client.id];
console.log('Client ' + client.id + ' disconnected. Deleted');
});
client.on('WH', function (from, msg) {
console.log('Message from Webhook', from, ' : ', msg);
client.broadcast.emit('message', { message: msg });
//console.log('send to: ' + clientid);
//ws.to(clientid).emit('hey', { message: msg });
//client.emit('message', { message: msg })
});
client.on('CL', function (from, msg) {
console.log('Message from Client', from, ' : ', msg);
client.broadcast.emit('message', 'me', msg);
//ws.to(client.id).emit('message', 'me', msg);
//client.emit('message', 'me', msg);
});
});
server.listen(process.env.PORT || port);
console.log('WebSocket Server is running on port ' + port);
Webhook Module
'use strict'
//This is WebHook Server
const express = require('express');
const bodyParser = require('body-parser');
const request = require('request');
const http = require('http');
const io = require('socket.io-client');
const app = express()
app.use(bodyParser.json())
const clients = {};
const SocketIO = require('socket.io');
const server = http.createServer(app);
const ws = SocketIO(server);
const port = 5000;
let Res;
let httpreq = false;
let nctid;
let ts;
const socket = io.connect('http://localhost:3000', {reconnect: true});
// Add a connect listener
socket.on('connect', function() {
console.log('Connected to WebSocket server!');
});
socket.on('message', function(from, msg) {
//console.log('Message from ', from, ' : ', msg);
console.log('nctid: ' + nctid + ', ts: ' + ts);
//Get the message from Client
if (httpreq) {
Res.send({
replies: [{
type: 'text',
content: msg,
}],
conversation: {
memory: {
key: msg
}
}
})
httpreq = false;
}
});
app.listen(process.env.PORT || port, () => {
console.log('Webhook server is running on port ' + port);
})
app.post('/', (req, res) => {
//console.log(req.body)
let query = req.body.nlp.entities.query[0].value;
nctid = req.body.nlp.entities.nctid[0].value;
ts = Math.floor(Date.now() / 1000);
console.log("query: " + query + '|' + nctid + '|' + ts);
//Send message to WebSocket server with parameter query and NCTID
socket.emit('WH', 'me', query + '|' + nctid);
Res = res;
httpreq = true;
})
app.post('/errors', (req, res) => {
console.log(req.body);
res.send();
})
Client Module
'use strict'
//This is client app running on client premise
const request = require('request');
const parser = require('xml2json');
const io = require('socket.io-client');
const socket = io.connect('http://localhost:3000', {reconnect: true});
// Add a connect listener
socket.on('connect', function(socket) {
console.log('Connected to WebSocket server!');
});
socket.on('message', function(from, msg) {
//console.log('MSG', from, ' : ', msg);
console.log(from);
let param = from.message.split('|');
let query = param[0];
let nctid = param[1];
if (typeof nctid != 'undefined') {
getNCTID(nctid, function(returnValue) {
//console.log(returnValue);
try {
let json = parser.toJson(returnValue);
json = JSON.parse(json);
if (query == 'title')
socket.emit('CL', 'me', 'Title is ' + json.clinical_study.brief_title);
else
socket.emit('CL', 'me', 'Status is ' + json.clinical_study.overall_status);
} catch (e) {
console.log(e);
socket.emit('CL', 'me', 'No NCTID ' + nctid);
}
});
}
});
function getNCTID(nctid, callback) {
let url = "https://clinicaltrials.gov/ct2/show/" + nctid + "?displayxml=true";
let options = {
url: url,
method: 'GET'
}
//console.log(options);
let requestWithEncoding = function(options, callback) {
let req = request.get(options);
req.on('response', function(res) {
let chunks = [];
res.on('data', function(chunk) {
chunks.push(chunk);
});
res.on('end', function() {
let buffer = Buffer.concat(chunks);
let encoding = res.headers['content-encoding'];
if (encoding == 'gzip') {
zlib.gunzip(buffer, function(err, decoded) {
callback(err, decoded && decoded.toString());
});
} else if (encoding == 'deflate') {
zlib.inflate(buffer, function(err, decoded) {
callback(err, decoded && decoded.toString());
})
} else {
callback(null, buffer.toString());
}
});
});
req.on('error', function(err) {
callback(err);
});
}
requestWithEncoding(options, function(err, data) {
if (err) {
console.log('err:' + err);
callback('error');
} else
//console.log(data);
callback(data);
})
}
I have NodeJS App and want to start use OpenVPN connection in it.
To do that I found 2 modules on npm (openvpn-client and openvpn-bin) - but any of them has no good docs and examples, but I try as I can to use them and it was unsuccessful.
I have Ipvanish account (login/password) with 540 .opvn files, which I can use. I try this:
var openvpnmanager = require('node-openvpn');
var openvpnBin = require('openvpn-bin');
var path = require('path');
var filePath = path.normalize('../geo/ipvanish/ipvanish-AU-Sydney-syd-a16.ovpn');
var opts = {
host: 'syd-a16.ipvanish.com', // normally '127.0.0.1', will default to if undefined
port: 443, //port openvpn management console
timeout: 60000, //timeout for connection - optional, will default to 1500ms if undefined
config: filePath
};
var auth = {
user: 'email#gmail.com',
pass: 'password'
};
var openvpn = openvpnmanager.connect(opts)
openvpn.on('connected', function() {
// will be emited on successful interfacing with openvpn instance
console.log('connected')
openvpnmanager.authorize(auth).then(function(res){
});
});
I use this, more effective way (with it I can handle OpenVPN connection as child process, close and reconnect on the fly).
var exec = require('child_process').exec;
var psTree = require('ps-tree');
var kill = function (pid, signal, callback) {
signal = signal || 'SIGKILL';
callback = callback || function () {};
var killTree = true;
if(killTree) {
psTree(pid, function (err, children) {
[pid].concat(
children.map(function (p) {
return p.PID;
})
).forEach(function (tpid) {
try { process.kill(tpid, signal) }
catch (ex) { }
});
callback();
});
} else {
try { process.kill(pid, signal) }
catch (ex) { }
callback();
}
};
var ovpnProcess = null;
if(ovpnProcess != null){
console.log('close connection');
var isWin = /^win/.test(ovpnProcess.platform);
if(!isWin) {
kill(ovpnProcess.pid);
} else {
var cp = require('child_process');
cp.exec('taskkill /PID ' + ovpnProcess.pid + ' /T /F', function (error, stdout, stderr) {
// more debug if you need
// console.log('stdout: ' + stdout);
// console.log('stderr: ' + stderr);
// if(error !== null) {
// console.log('exec error: ' + error);
// }
});
}
}
// to open connection I use this code:
ovpnProcess = exec('openvpn ipvanish/'+account.ip+'.ovpn');
ovpnProcess.stdout.on('data', function(data) {
console.log('stdout: ' + data);
});
ovpnProcess.stderr.on('data', function(data) {
console.log('stdout: ' + data);
});
ovpnProcess.on('close', function(code) {
console.log('closing code: ' + code);
});
you can get help from https://www.npmjs.com/package/node-openvpn or OpenVPN with node, How it works?.