I am using socket.io in nodejs and I am able to send data from client to server. But when I emit from server, the client does not seem to be receiving this...
What am i missing ?
server:
socket = io.listen(app);
socket.sockets.on('connection', function(client){
client.on('something-from-client', function(msg){
console.log(msg);
//do something.
client.emit('some-result',{"total":docs.length});
});
});
client:
var socket = io.connect('http://localhost:9999');
socket.on('some-result', function(data){
console.log('received from server', data);
});
socket.emit("something-from-client", {"lat":lat, "lng":lng});
Ok got it working, if express is being used, some minor changes need to be done on server side
var port = 8111;
var server = express.createServer();
io = require('socket.io').listen(server);
server.listen(port);
io.sockets.on('connection', function (socket) {
socket.emit('news', { hello: 'world' });
socket.on('my other event', function (data) {
console.log(data);
});
});
As promised - Working code - https://github.com/parj/node-websocket-demo/tree/socket_emit
CF Reference - http://socket.io/#how-to-use
Related
Okay as I said i the title when I go to my home page the socket connection works perfectly but when I use a route it doesnt work at all here is my index.js
io.of('/admin').on('connection', function(socket) {
console.log('made socket connection', socket.id);
console.log(socket.request.user);
socket.on('chat', async function(data) {
console.log(data);
client.guilds.channels.get('474951005788962846').send(data);
io.sockets.emit('chat', data);
});
});
io.on('connection', function(socket) {
console.log('made socket connection', socket.id);
console.log(socket.request.user);
socket.on('chat', async function(data) {
console.log(data);
client.guilds.channels.get('474951005788962846').send(data);
io.sockets.emit('chat', data);
});
});
and on my /admin page here is my script that it is the same but the connection isnt as I added the /admin
<script>
var socket = io.connect('https://domain/admin');
// Query DOM
var serverID = document.getElementById('add_server_id');
var serverRoles = document.getElementById('add_role_ids');
var btnServer = document.getElementById('add_server_save');
//var output = document.getElementById('output');
// Emit events
btnServer.addEventListener('click', function(){
socket.emit('chat', {
serverid: serverID.value,
serverroles: serverRoles.value
});
});
//Listen for events
socket.on('chat', function(data) {
console.log(data);
//output.innerHTML += '<p><strong>' + data.game + '</strong></p>';
});
</script>
if someone can tell me why is it not connecting I would really appreciate it
var socket = io.connect('https://domain/admin');
to
var socket = io.connect('/admin');
The namespace is an implementation detail of the Socket.IO protocol,
and is not related to the actual URL of the underlying transport,
which defaults to /socket.io/….
I have a working socket.io server up and running, and i am trying to implement a server side socket.io client. Below is the code snippet i have been using for testing. The problem with this is that the client outputs the message only once, in this case it receives 'Welcome' only. I have tried sending messages to the private channel, 'message' via browser but it doesn't show any output even though the server can receive and emit the message successfully.
Client
var io = require('socket.io-client');
var socket = io.connect('http://localhost:3000', {'force new connection': true});
socket.on('connect', function(){
socket.on('message', function (data) {
console.log(data);
});
});
Server
var io = require('socket.io').listen(server);
var i=0;
io.sockets.on('connection', function (socket) {
socket.emit('message', { 'msg': 'Welcome'});
socket.on('message', function (from, msg) {
socket.emit('message', { 'msg': 'Hello World - ' + i });
i++;
});
});
Have you tried doing this?
console.log(data.msg);
Can you try changing "socket" to "this":
this.emit('message', { 'msg': 'Hello World - ' + i });
You should emit from client side to server. So server can send the data back to client. I guess this code works fine :-)
Client
var io = require('socket.io-client');
var socket = io.connect('http://localhost:3000', {'force new connection': true});
socket.on('connect', function(){
socket.on('messageRecieved', function (data) {
console.log(data);
});
socket.emit('message','some message');
});
Server
var io = require('socket.io').listen(server);
var i=0;
io.sockets.on('connection', function (socket) {
socket.on('message', function (msg) {
console.log(msg);
socket.emit('messageRecieved', { 'msg': 'Hello World - ' + i });
i++;
});
});
I have a socket.io server running and a matching webpage with a socket.io.js client. All works fine.
But, I am wondering if it is possible, on another machine, to run a separate node.js application which would act as a client and connect to the mentioned socket.io server?
That should be possible using Socket.IO-client: https://github.com/LearnBoost/socket.io-client
Adding in example for solution given earlier. By using socket.io-client https://github.com/socketio/socket.io-client
Client Side:
//client.js
var io = require('socket.io-client');
var socket = io.connect('http://localhost:3000', {reconnect: true});
// Add a connect listener
socket.on('connect', function (socket) {
console.log('Connected!');
});
socket.emit('CH01', 'me', 'test msg');
Server Side :
//server.js
var app = require('express')();
var http = require('http').Server(app);
var io = require('socket.io')(http);
io.on('connection', function (socket){
console.log('connection');
socket.on('CH01', function (from, msg) {
console.log('MSG', from, ' saying ', msg);
});
});
http.listen(3000, function () {
console.log('listening on *:3000');
});
Run :
Open 2 console and run node server.js and node client.js
After installing socket.io-client:
npm install socket.io-client
This is how the client code looks like:
var io = require('socket.io-client'),
socket = io.connect('http://localhost', {
port: 1337,
reconnect: true
});
socket.on('connect', function () { console.log("socket connected"); });
socket.emit('private message', { user: 'me', msg: 'whazzzup?' });
Thanks alessioalex.
const io = require('socket.io-client');
const socket_url = "http://localhost:8081";
let socket = io.connect(socket_url);
socket.on('connect', function () {
socket.emit("event_name", {});
});
Yes you can use any client as long as it is supported by socket.io. No matter whether its node, java, android or swift. All you have to do is install the client package of socket.io.
Client side code: I had a requirement where my nodejs webserver should work as both server as well as client, so i added below code when i need it as client, It should work fine, i am using it and working fine for me!!!
const socket = require('socket.io-client')('http://192.168.0.8:5000', {
reconnection: true,
reconnectionDelay: 10000
});
socket.on('connect', (data) => {
console.log('Connected to Socket');
});
socket.on('event_name', (data) => {
console.log("-----------------received event data from the socket io server");
});
//either 'io server disconnect' or 'io client disconnect'
socket.on('disconnect', (reason) => {
console.log("client disconnected");
if (reason === 'io server disconnect') {
// the disconnection was initiated by the server, you need to reconnect manually
console.log("server disconnected the client, trying to reconnect");
socket.connect();
}else{
console.log("trying to reconnect again with server");
}
// else the socket will automatically try to reconnect
});
socket.on('error', (error) => {
console.log(error);
});
something like this worked for me
const WebSocket = require('ws');
const ccStreamer = new WebSocket('wss://somthing.com');
ccStreamer.on('open', function open() {
var subRequest = {
"action": "SubAdd",
"subs": [""]
};
ccStreamer.send(JSON.stringify(subRequest));
});
ccStreamer.on('message', function incoming(data) {
console.log(data);
});
Here's my problem:
I have server A, running node.js and using socket.io for communicating with clients (web browsers). This all is running fine and dandy.
However, now that I have server B, which also needs to connect to server A through websockets, I have hit a wall. None of the node.js websocket clients I've found won't work with the socket.io on the server A.
So, this is the case I'm striving for:
.--------. .----------. .----------.
| CLIENT | <--> | SERVER A | <--> | SERVER B |
'--------' '----------' '----------'
Client-server A connection is done through socket.io
Now, Server B (running node.js) should connect to server A via websocket (in order to go through port 80). But...
Even the example code in socket.io-client module doesn't work... :/
// Connect to server
var socket = new io.Socket('localhost', {port: 8080});
socket.connect();
// Add a connect listener
socket.on('connect', function(socket) {
console.log('Connected.');
});
The code just passes without any errors and execution ends after few seconds.
Update: Code samples
Server (which works just fine) looks like this:
// Load requirements
var http = require('http'),
io = require('socket.io');
// Create server & socket
var server = http.createServer(function(req, res){
// Send HTML headers and message
res.writeHead(404, {'Content-Type': 'text/html'});
res.end('<h1>Aw, snap! 404</h1>');
});
server.listen(8080);
io = io.listen(server);
// Add a connect listener
io.sockets.on('connection', function(socket) {
console.log('Client connected.');
// Disconnect listener
socket.on('disconnect', function() {
console.log('Client disconnected.');
});
});
Client looks like this
console.log('1');
// Connect to server
var io = require('socket.io-client')
var socket = new io.Socket('localhost', {port: 8080});
socket.connect();
console.log('2');
// Add a connect listener
socket.on('connect', function(socket) {
console.log('Connected!');
});
console.log('3');
1, 2 and 3 prints out just fine, no errors, and few seconds later the process just exits
Also, server A doesn't output anything to the log, even though I have the socket.io logging set on "everything".
For future people:
Here is 2 very simple Node.js apps that use socket.io to connect, send and receive messages between each other.
Required package is:
npm install socket.io
Node-App-1 server.js:
var io = require('socket.io').listen(3000);
io.on('connection', function (socket) {
console.log('connected:', socket.client.id);
socket.on('serverEvent', function (data) {
console.log('new message from client:', data);
});
setInterval(function () {
socket.emit('clientEvent', Math.random());
console.log('message sent to the clients');
}, 3000);
});
Node-App-2 client.js:
var io = require('socket.io-client');
var socket = io.connect("http://localhost:3000/", {
reconnection: true
});
socket.on('connect', function () {
console.log('connected to localhost:3000');
socket.on('clientEvent', function (data) {
console.log('message from the server:', data);
socket.emit('serverEvent', "thanks server! for sending '" + data + "'");
});
});
Turns out I was using old examples, for some reason, even though I triple checked them. Well, doh.
Also, it turned out that the socket.io-client is broken on latest Node (6.x.x). Managed to find an update from github for it, replaced the files and yay, everything's working!
Edit: Unfortunately I didn't save any links to working examples but after quickly skimming through the code it seems that the only changes were to the client code, which now looks like this:
console.log('1');
// Connect to server
var io = require('socket.io-client')
var socket = io.connect('localhost:8080', {reconnect: true});
console.log('2');
// Add a connect listener
socket.on('connect', function(socket) {
console.log('Connected!');
});
console.log('3');
Here is a snippet of code I wrote, it's using socket.io 1.0.6 and socket.io-client 1.0.6. The case is the following:
Server A (Socket.io Client) <---> Server B (Socket.io Server)
Server B (Server):
// Load requirements
var http = require('http'),
io = require('socket.io');
// Create server & socket
var server = http.createServer(function(req, res)
{
// Send HTML headers and message
res.writeHead(404, {'Content-Type': 'text/html'});
res.end('<h1>Aw, snap! 404</h1>');
});
server.listen(8080);
io = io.listen(server);
// Add a connect listener
io.sockets.on('connection', function(socket)
{
console.log('Client connected.');
// Disconnect listener
socket.on('disconnect', function() {
console.log('Client disconnected.');
});
});
Server A (Client):
console.log('1');
// Connect to server
var io = require('socket.io-client');
var socket = io.connect('http://localhost:8080', {reconnect: true});
console.log('2');
// Add a connect listener
socket.on('connect', function(socket) {
console.log('Connected!');
});
console.log('3');
If I'm using localhost:8080 only on the client server it doesn't connect.
I wrote the simple script (app.js) to subscribe redis' channel
var app = require('express').createServer()
, io = require('socket.io').listen(app);
var redis = require("redis");
app.listen(8080);
////////////// Dev environment; replace by PERL in production use.
app.get('/', function (req, res) {
res.sendfile(__dirname + '/index.html');
});
//////////////
io.sockets.on('connection', function (socket) {
socket.subscribe = redis.createClient();
socket.subscribe.subscribe('chat');
socket.subscribe.on("message", function(channel, message) {
socket.send(message);
});
socket.on('disconnect', function() {
socket.subscribe.quit();
});
socket.on('close', function() {
socket.subscribe.quit();
});
});
Now, I want to make possible to subscribe to private channel for each user.
I tried to pass extra data via socket.io.connect like this:
<script src="/socket.io/socket.io.js"></script>
<script>
var socket = io.connect('http://localhost:8080', {'PRIVATE_ROOM_HASH': 'secret_hash'});
socket.on('message', function (data) {
console.log(data);
});
</script>
and then in app.js
...
io.sockets.on('connection', function (socket, args) {
socket.subscribe = redis.createClient();
socket.subscribe.subscribe(args.PRIVATE_ROOM_HASH);
socket.subscribe.on("message", function(channel, message) {
socket.send(message);
});
but it does not work.
Any ideas how to resolve private rooms' problem?
Thanks.
I don't think you can pass extra arguments to the socket.io connect command and then get them in the server. If I'm wrong someone correct me. I can't find this anywhere in the socket.io documentation.
Anyway, socket.io has built in support for rooms. On the client side, you would for example send a join event to the server with the name of the room
var socket = io.connect('http://localhost:8080');
socket.on('connect', function() {
socket.emit('join', 'secret_hash');
});
socket.on('message', function(msg) {
// got a messae!
});
And on the server, you would use the rooms feature.
io.sockets.on('connection', function(socket) {
socket.on('join', function(room) {
socket.join(room);
socket.on('message', function(msg) {
socket.broadcast.to(room).emit('message', msg);
});
});
});
No need to do that, since you'll be duplicating functionality. With Socket.IO you can make the client join rooms, like described on their github page:
var io = require('socket.io').listen(80);
io.sockets.on('connection', function (socket) {
socket.join('justin bieber fans');
socket.broadcast.to('justin bieber fans').emit('new fan');
io.sockets.in('rammstein fans').emit('new non-fan');
});
Also if you'd like real auth, the best would be with sessions, I recommend you read the article about Express, Socket.IO and sessions.