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Keep a node.js network connection alive by reconnecting repeatedly
JavaScript
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README.markdown

recon

Keep your network connections alive in node.js no matter what. Recon looks like a regular tcp connection but it listens for disconnect events and tries to re-establish the connection behind the scenes. While the connection is down, write() returns false and the data gets buffered. When the connection comes back up, recon emits a drain event.

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Examples

stayin_alive.js

var recon = require('recon');
var conn = recon(4321);

conn.on('data', function (buf) {
    var msg = buf.toString().trim()
    console.log(msg);
});

then fire up stayin_alive.js: $ node stayin_alive.js

and then you can listen on port 4321 with netcat, type some stuff, kill netcat, and fire it up again to type some more stuff: $ nc -lp 4321 nc: using stream socket everybody stop ^C $ nc -lp 4321 nc: using stream socket hammertime ^C

and meanwhile stayin_alive.js didn't skip a beat: $ node stayin_alive.js everybody stop hammertime

Usage

recon(port)

recon(port, host, cb, kwargs={})

Create a connection. The arguments can be specified in kwargs or wherever in arguments list and are optional except port. cb is a function that gets the raw Stream object each time a new connection happens for tacking on methods like .setNoDelay().

write(msg)

Like stream.write, but buffers data while the module is reconnecting.

end()

end(msg)

Terminate the connection (and don't reconnect).

Events

Event: data

Event: drain

Just like stream.

Event: connect

Emitted only the first time the connection is established.

Event: reconnect

Emitted each time the module establishes a connection after the first time.

Event: error(err)

Just like stream, unless err.errno is 111 (ECONNREFUSED), in which case the error gets eaten and recon reconnects behind the scenes.

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