how to use node.js upgrade event socket outside callback?

Question

I am using node.js connect framework to listen to upgrade event. I can use the socket in callback function to write back to client. But how can I use the socket outside callback function to write to same client. In my case there is only one client connected to server.

app.on('upgrade', function(req, socket) {
    socket.write('hello');    
});

function sendEvent()
{
 // how to use socket here??
}

sendEvent();

score 1 · Accepted Answer · answered May 31 '12 at 02:14

1

Try saving the socket for later use (ie outside the app.on() function):

var socket;

app.on('upgrade', function(req, sock) {
    socket = sock;
    socket.write('hello');
});

function sendEvent() {
    socket.write('hi!');
}

sendEvent();

answered May 31 '12 at 02:14

qwertymk

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score 0 · Answer 2 · answered May 31 '12 at 03:53

If:

really only one client is ever connected to this server, OR
there are multiple clients connected, but it's ok for all of them to receive the event

Then you can use

sockets.emit("some_event")

which would broadcast to all connected clients (or 1 client in your case).

how to use node.js upgrade event socket outside callback?

2 Answers2