Add chrome:://device-log

chrome/browser/resources/chromeos/device_log_ui/device_log_ui.js

+// Copyright 2014 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.
+
+var DeviceLogUI = (function() {
+  'use strict';
+
+  /**
+   * Creates a tag for the log level.
+   *
+   * @param {string} level A string that represents log level.
+   * @return {HTMLSpanElement} The created span element.
+   */
+  var createLevelTag = function(level) {
+    var levelClassName = 'log-level-' + level.toLowerCase();
+    var tag = document.createElement('span');
+    tag.textContent = level;
+    tag.className = 'level-tag ' + levelClassName;
+    return tag;
+  };
+
+  /**
+   * Creates a tag for the log type.
+   *
+   * @param {string} level A string that represents log type.
+   * @return {HTMLSpanElement} The created span element.
+   */
+  var createTypeTag = function(type) {
+    var typeClassName = 'log-type-' + type.toLowerCase();
+    var tag = document.createElement('span');
+    tag.textContent = type;
+    tag.className = 'type-tag ' + typeClassName;
+    return tag;
+  };
+
+  /**
+   * Creates an element that contains the time, the event, the level and
+   * the description of the given log entry.
+   *
+   * @param {Object} logEntry An object that represents a single line of log.
+   * @return {?HTMLParagraphElement} The created p element that represents
+   *     the log entry, or null if the entry should be skipped.
+   */
+  var createLogEntryText = function(logEntry) {
+    var level = logEntry['level'];
+    var levelCheckbox = 'log-level-' + level.toLowerCase();
+    if ($(levelCheckbox) && !$(levelCheckbox).checked)
+      return null;
+
+    var type = logEntry['type'];
+    var typeCheckbox = 'log-type-' + type.toLowerCase();
+    if ($(typeCheckbox) && !$(typeCheckbox).checked)
+      return null;
+
+    var res = document.createElement('p');
+    var textWrapper = document.createElement('span');
+    var fileinfo = '';
+    if ($('log-fileinfo').checked)
+      fileinfo = logEntry['file'];
+    var timestamp = '';
+    if ($('log-timedetail').checked)
+      timestamp = logEntry['timestamp'];
+    else
+      timestamp = logEntry['timestampshort'];
+    textWrapper.textContent = loadTimeData.getStringF(
+      'logEntryFormat',
+      timestamp,
+      fileinfo,
+      logEntry['event']);
+    res.appendChild(createTypeTag(type));
+    res.appendChild(createLevelTag(level));
+    res.appendChild(textWrapper);
+    return res;
+  };
+
+  /**
+   * Creates event log entries.
+   *
+   * @param {Array.<string>} logEntries An array of strings that represent log
+   *     log events in JSON format.
+   */
+  var createEventLog = function(logEntries) {
+    var container = $('log-container');
+    container.textContent = '';
+    for (var i = 0; i < logEntries.length; ++i) {
+      var entry = createLogEntryText(JSON.parse(logEntries[i]));
+      if (entry)
+        container.appendChild(entry);
+    }
+  };
+
+  /**
+   * Callback function, triggered when the log is received.
+   *
+   * @param {Object} data A JSON structure of event log entries.
+   */
+  var getLogCallback = function(data) {
+    createEventLog(JSON.parse(data));
+  };
+
+  /**
+   * Requests a log update.
+   */
+  var requestLog = function() {
+    chrome.send('DeviceLog.getLog');
+  };
+
+  /**
+   * Sets refresh rate if the interval is found in the url.
+   */
+  var setRefresh = function() {
+    var interval = parseQueryParams(window.location)['refresh'];
+    if (interval && interval != '')
+      setInterval(requestLog, parseInt(interval) * 1000);
+  };
+
+  /**
+   * Gets log information from WebUI.
+   */
+  document.addEventListener('DOMContentLoaded', function() {
+    // Show all levels except 'debug' by default.
+    $('log-level-error').checked = true;
+    $('log-level-user').checked = true;
+    $('log-level-event').checked = true;
+    $('log-level-debug').checked = false;
+
+    // Show all types by default.
+    var checkboxes = document.querySelectorAll(
+        '#log-checkbox-container input[type="checkbox"][id*="log-type"]');
+    for (var i = 0; i < checkboxes.length; ++i)
+      checkboxes[i].checked = true;
+
+    $('log-fileinfo').checked = false;
+    $('log-timedetail').checked = false;
+
+    $('log-refresh').onclick = requestLog;
+    checkboxes = document.querySelectorAll(
+        '#log-checkbox-container input[type="checkbox"]');
+    for (var i = 0; i < checkboxes.length; ++i)
+      checkboxes[i].onclick = requestLog;
+
+    setRefresh();
+    requestLog();
+  });
+
+  return {
+    getLogCallback: getLogCallback
+  };
+})();