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Renders gadgets, provides the gadget metadata service, and serves all javascript required by the OpenSocial specification.
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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

var perfStats = null;
var currentRun = {};

function perfService(message) {
  if (perfStats.numResults++ === 0) {
    perfStats.firstMsg = message; // stored since it has "real" start time
  }
  perfStats.bytesReceived += message.length;
};

function clearPerfStats(inOrOut) {
  perfStats = {
    numResults: 0,
    bytesReceived: 0,
    firstMsg: null
  };

  document.getElementById("in_or_out").innerHTML = inOrOut;

  // hide results fields
  document.getElementById("results").style.display = "none";
};

function completePerfStats() {
  perfStats.timeEnded = new Date().getTime();

  // get time started from the first sent message
  perfStats.timeStarted = perfStats.firstMsg.substr(0, perfStats.firstMsg.indexOf(':'));

  var timeUsedMs = perfStats.timeEnded - perfStats.timeStarted;

  // fill in fields
  document.getElementById("results_num_received").innerHTML = perfStats.numResults;
  document.getElementById("results_bytes_received").innerHTML = perfStats.bytesReceived;
  document.getElementById("results_time_used").innerHTML = timeUsedMs + "ms";
  document.getElementById("results_msgs_per_sec").innerHTML = (perfStats.numResults / (timeUsedMs / 1000));
  document.getElementById("results_bytes_per_sec").innerHTML = (perfStats.bytesReceived / (timeUsedMs / 1000));
  document.getElementById("test_running").style.display = "none";
  document.getElementById("results").style.display = "";
};

function initPerfTest() {
  clearPerfStats();
  gadgets.rpc.register("perf_service", perfService);
  gadgets.rpc.register("clear_perf_stats", clearPerfStats);
  gadgets.rpc.register("complete_perf_stats", completePerfStats);
};

var alphabet = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 _-*&(){}'";

function sendPerfMessage() {
  var msgToSend = currentRun.msg;
  if (currentRun.curMsgId++ <= 1) {
    var nowString = new Date().getTime() + ':';
    msgToSend = nowString + currentRun.msg.substring(nowString.length);
  }

  gadgets.rpc.call(currentRun.targetId, "perf_service", null, msgToSend);
  if (currentRun.curMsgId < currentRun.endMsgId) {
    // loop, giving up execution in case rpc technique demands it
    window.setTimeout(sendPerfMessage, 0);
  } else {
    // send finisher
    window.setTimeout(function() { gadgets.rpc.call(currentRun.targetId, "complete_perf_stats", null); }, 0);
  }
};

function runPerfTest(targetId) {
  document.getElementById("test_running").style.display = "";

  // initialize the current run
  var num_msgs = document.getElementById("num_msgs").value;
  var msg_size = document.getElementById("msg_size").value;

  currentRun.targetId = targetId;
  currentRun.curMsgId = 0;
  currentRun.endMsgId = num_msgs;

  var msg = [];
  for (var i = 0; i < msg_size; ++i) {
    msg[i] = alphabet.charAt(Math.round(Math.random(alphabet.length)));
  }
  currentRun.msg = msg.join('');

  // clear local perf stats
  clearPerfStats("(outbound)");

  // clear target perf stats
  gadgets.rpc.call(targetId, "clear_perf_stats", null, "(inbound)");

  // kick off the send loop
  sendPerfMessage();
};