Refactored web-app

remoting/webapp/me2mom/debug_log.js

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @fileoverview
  * Module to support logging debug messages.
  */
 
 'use strict';
 
 /** @suppress {duplicate} */
 var remoting = remoting || {};
 
 /**
  * @constructor
  * @param {Element} logElement The HTML div to which to add log messages.
+ * @param {Element} statsElement The HTML div to which to update stats.
  */
-remoting.DebugLog = function(logElement) {
-  this.debugLog = logElement;
+remoting.DebugLog = function(logElement, statsElement) {
+  this.logElement = logElement;
+  this.statsElement = statsElement;
 };
 
-/** Maximum number of lines to record in the debug log. Only the most
- *  recent <n> lines are displayed. */
+/**
+ * Maximum number of lines to record in the debug log. Only the most
+ * recent <n> lines are displayed.
+ */
 remoting.DebugLog.prototype.MAX_DEBUG_LOG_SIZE = 1000;
 
 /**
  * Add the given message to the debug log.
  *
  * @param {string} message The debug info to add to the log.
  */
 remoting.DebugLog.prototype.log = function(message) {
   // Remove lines from top if we've hit our max log size.
-  if (this.debugLog.childNodes.length == this.MAX_DEBUG_LOG_SIZE) {
-    this.debugLog.removeChild(this.debugLog.firstChild);
+  if (this.logElement.childNodes.length == this.MAX_DEBUG_LOG_SIZE) {
+    this.logElement.removeChild(this.logElement.firstChild);
   }
 
   // Add the new <p> to the end of the debug log.
   var p = document.createElement('p');
   p.appendChild(document.createTextNode(message));
-  this.debugLog.appendChild(p);
+  this.logElement.appendChild(p);
 
   // Scroll to bottom of div
-  this.debugLog.scrollTop = this.debugLog.scrollHeight;
+  this.logElement.scrollTop = this.logElement.scrollHeight;
 };
 
+/**
+ * Show or hide the debug log.
+ */
+remoting.DebugLog.prototype.toggle = function() {
+  var debugLog = /** @type {Element} */ this.logElement.parentNode;
+  if (debugLog.hidden) {
+    debugLog.hidden = false;
+  } else {
+    debugLog.hidden = true;
+  }
+};
+
+/**
+ * Update the statistics panel.
+ * @param {Object.<string, number>} stats The connection statistics.
+ */
+remoting.DebugLog.prototype.updateStatistics = function(stats) {
+  var units = '';
+  var videoBandwidth = stats['video_bandwidth'];
+  if (videoBandwidth < 1024) {
+    units = 'Bps';
+  } else if (videoBandwidth < 1048576) {
+    units = 'KiBps';
+    videoBandwidth = videoBandwidth / 1024;
+  } else if (videoBandwidth < 1073741824) {
+    units = 'MiBps';
+    videoBandwidth = videoBandwidth / 1048576;
+  } else {
+    units = 'GiBps';
+    videoBandwidth = videoBandwidth / 1073741824;
+  }
+
+  var statistics = document.getElementById('statistics');
+  this.statsElement.innerText =
+      'Bandwidth: ' + videoBandwidth.toFixed(2) + units +
+      ', Frame Rate: ' +
+          (stats['video_frame_rate'] ?
+           stats['video_frame_rate'].toFixed(2) + ' fps' : 'n/a') +
+      ', Capture: ' + stats['capture_latency'].toFixed(2) + 'ms' +
+      ', Encode: ' + stats['encode_latency'].toFixed(2) + 'ms' +
+      ', Decode: ' + stats['decode_latency'].toFixed(2) + 'ms' +
+      ', Render: ' + stats['render_latency'].toFixed(2) + 'ms' +
+      ', Latency: ' + stats['roundtrip_latency'].toFixed(2) + 'ms';
+};
+
+/**
+ * Check for the debug toggle hot-key.
+ *
+ * @param {Event} event The keyboard event.
+ * @return {void} Nothing.
+ */
+remoting.DebugLog.onKeydown = function(event) {
+  if (String.fromCharCode(event.which) == 'D') {
+    remoting.debug.toggle();
+  }
+}
+
 /** @type {remoting.DebugLog} */
 remoting.debug = null;