Log websocket messages

wslog.js

// Dump this into your web console in a live notebook
function safeLog(type) {
  try {
    console.log.apply(console, arguments);
  } catch(err) {
    console.warn(type, 'could not print data');
  }
}
var orig1 = Jupyter.notebook.kernel.ws.onmessage;
Jupyter.notebook.kernel.ws.onmessage = function() {
  safeLog('recv', JSON.parse(arguments[0].data));
  return orig1.apply(Jupyter.notebook.kernel.ws, arguments);
};
var orig2 = Jupyter.notebook.kernel.ws.send;
Jupyter.notebook.kernel.ws.send = function() {
  safeLog('send', arguments);
  return orig2.apply(Jupyter.notebook.kernel.ws, arguments);
};