Moved chromium_status to appengine/

appengine_apps/chromium_status/static/js/status_viewer/data_fetcher.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.
-
-/**
- * Helper that fetches the tree status data from a server.
- *
- * The public method it exports is:
- *   DataFetcher.GetTreeStatusEntries(timeRange, callback) method.
- */
-var DataFetcher = {};
-
-// -----------------------------------------------------------------------------
-// Private implementation
-// -----------------------------------------------------------------------------
-(function() {
-
-/**
- * Downloads a single url and calls callback(text,error) on completion.
- *
- * @param {string} url
- * @param {function} callback
- */
-function Fetch(url, callback) {
-  var r = new XMLHttpRequest();
-  r.open("GET", url, true);
-  r.setRequestHeader("pragma", "no-cache");
-  r.setRequestHeader("cache-control", "no-cache");
-  r.onreadystatechange = function() {
-    if (r.readyState == 4) {
-      var error;
-      var text = r.responseText;
-      if (r.status != 200) {
-        error = url + ": " + r.status + ": " + r.statusText;
-      } else if (! text) {
-        error = url + ": null response";
-      }
-      callback(text, error);
-    }
-  }
-
-  r.send(null);
-}
-
-/**
- * Parses response (text, error) and appends the parsed entry to |entries|.
- *
- * /allstatus returns entries as "<author>, <date>,<message>\n" lines, with
- * a header line reading "Who,When,Message\n".
- *
- */
-function ParseDataResponseAndAppend(entries, text, error) {
-  if (error) {
-    // If we failed to download the file, error.
-    Log("Failed to retrieve the data from server. Error:\n" + error);
-    return false;  // failure.
-  }
-
-  var content = JSON.parse(text);
-  if (!content.length) {
-    Log("Content seems to be invalid");
-    return false;
-  }
-
-  for (var i = 0; i < content.length; ++i) {
-    // The time has a trailing ".XXXXX" ms component we don't care for.
-    // Also append "UTC" so we are left with a string resembling:
-    // "2009-10-14 21:59:18 UTC"
-    var item = content[i];
-    dateStr = item.date.split(".")[0] + " UTC";
-    entries.push(
-      new Entry(DateUtil.ParseUTCDateTimeString(dateStr), item.username,
-        item.message, item.general_state));
-
-  }
-
-  return true;  // success.
-}
-
-/**
- * Fetches all of the tree status data relating to |range|.
- * On completion |callback(entries)| is invoked, where |entries| is a list of
- * Entry instances.
- *
- * @param {TimeRange} timeRange
- * @param {function} callback
- */
-DataFetcher.GetTreeStatusEntries = function(timeRange, callback) {
-  // Convert milliseconds to seconds, since the server is epxecting
-  // seconds.
-  var startTime = DateUtil.MillisToSeconds(timeRange.startTime);
-  var endTime = DateUtil.MillisToSeconds(timeRange.endTime);
-
-  // The peak hours view may need extra time for its day view.
-  // Lets go ahead and optimisitically ask for it, just in case...
-  startTime += DateUtil.MillisToSeconds(DateUtil.MILLIS_PER_DAY);
-  endTime -= DateUtil.MillisToSeconds(DateUtil.MILLIS_PER_DAY);
-
-  var url = "/allstatus?format=json&startTime=" + startTime + "&endTime=" +
-      endTime + "&limit=1000";
-
-  Fetch(url, OnFetchedDataComplete.bind(this, callback));
-}
-
-/**
- * Callback for when the data has been fetched.
- *
- * @param {function} callback The user's callback.
- * @param {string} text The contents of the response.
- * @param {string} error Any error message, or undefined on success.
- */
-function OnFetchedDataComplete(callback, text, error) {
-  var entries = [];
-  var ok = ParseDataResponseAndAppend(entries, text, error);
-  // TODO(eroman): Fix login situation.
-  if (!ok)
-    alert("TODO: You probably aren't logged in; try doing that first.");
-  callback(entries);
-}
-
-})();  // Private implementation.