non-intrusive logging of data over a socket

[Dave Horton]

is there any way to get an event from a net.socket when data is sent?  I have an app where I want to hand off a socket to a library, but then for debugging purposes I want to log everything sent or received over the socket by the library.  I'd rather not have to change the library, and I can register a 'data' handler to get the incoming data, but what about the outoing?

[Jimb Esser]

Assuming "write" is the only function call that sends data (not sure if stream piping or anything calls something internal instead... in which case you'd want to use a "through" stream), you can hook that directly by overriding it on your instance of a socket, something like this should work:

var orig_write = socket.write;

socket.write = function(data) {

  this.emit.call(this, 'write', data);

  return orig_write.apply(this, arguments);

};

socket.on('write', function (data) {
  // yay

});

// pass socket on to library now

Hope this helps!

  Jimb