gistfile1.js

// Call like wrapNamespaceInTracing(jetpac, 'jetpac');

g_callStack = [];
window.onerror = function(inputMessage, url, line) {
  if (typeof g_callStack !== 'undefined') {
    inputMessage += ' - stack=[' + g_callStack.join(' -> ') + ']';
    g_callStack = [];
  }
  var message = '**** Javascript error **** ' + inputMessage + ' at ' + url + ':' + line;
  console.log(message);
  var _p = 'none';
  if (typeof KM !== 'undefined') {
    _p = KM.i();
  }
  var errorUrl = '/jserror?';
  errorUrl += 'message=' + encodeURIComponent(inputMessage) + '&';
  errorUrl += 'script=' + encodeURIComponent(url) + '&';
  errorUrl += 'line=' + encodeURIComponent(line) + '&';
  errorUrl += '_p=' + encodeURIComponent(_p) + '&';
  errorImage = new Image(1, 1); // A deliberate global
  errorImage.src = errorUrl;
};

function logBefore(name, fn, options) {
  var fullName = options.moduleName + ':' + name + '()';
//  console.log("calling " + fullName);
  g_callStack.push(fullName);
}

function logAfter(name, fn, options) {
  var fullName = options.moduleName + ':' + name;
//  console.log("called " + fullName);
  g_callStack.pop();
}

function wrapNamespaceInTracing(object, name) {
  wrapFunctions({
    context: object,
    before: logBefore,
    after: logAfter,
    moduleName: name
  });
}

function wrapFunctions(options) {
  var context = options.context;
  var before = options.before;
  var after = options.after;
  var name, fn;
  for (name in context) {
    fn = context[name];
    if (typeof fn === 'function') {
      context[name] = (function(name, fn, options) {
        var args = arguments;
        var wrappingFunction = function() {
          if (before) {
            before.apply(this, args);
          }
          var result = fn.apply(this, arguments);
          if (after) {
            after.apply(this, args);
          }
          return result;
        };
        wrappingFunction.prototype = fn.prototype;
        for (var i in fn) {
          wrappingFunction[i] = fn[i];
        }
        return wrappingFunction;
      })(name, fn, options);
    }
  }
}