NodeJS v.0.10.X is not backwards compatible with v0.8.X for multicast

Question

NodeJS v.0.10.X is not backwards compatible with v0.8.X for multicast.

bind seems to have changed from synchronous to async.

I'm currently working around the issue with a horrible fudge:

https://github.com/chrisdew/multicast-eventemitter/blob/master/lib/multicast-eventemitter.js#L87

Is there a mistake in how I'm using the API, or is backwards compatibility broken here?

If I use the v0.10.X code with NodeJS v0.8.X I get no messages being received (I assume the call to 'bind' is synchronous here, and doesn't call the function provided.

If I use the v0.8.X code with NodeJS v0.10.X I get an error:

dgram.js:354
    throw errnoException(process._errno, 'setMulticastTTL');
          ^
Error: setMulticastTTL EBADF
    at errnoException (dgram.js:439:11)
    at Socket.setMulticastTTL (dgram.js:354:11)
    at MulticastEventEmitter.addListener (/home/chris/Dropbox/multicast-eventemitter/lib/multicast-eventemitter.js:96:14)
    at Object.<anonymous> (/home/chris/Dropbox/multicast-eventemitter/examples/loopback.js:17:9)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Function.Module.runMain (module.js:497:10)
    at startup (node.js:119:16)

Can anyone see a way to remove this horrendous fudge?

Answer 1

Yes, it is no longer synchronous. You can check the docs too.

Important note: the behavior of dgram.Socket#bind() has changed in v0.10 and is always asynchronous now.

If you have code that looks like this:

var s = dgram.createSocket('udp4');
s.bind(1234);
s.addMembership('224.0.0.114');

You have to change it to this:

var s = dgram.createSocket('udp4');
s.bind(1234, function() {
  s.addMembership('224.0.0.114');
});

It will be like this so you would have to change your code.