gecko/toolkit/components/places/tests/head_common.js

/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*-
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

const CURRENT_SCHEMA_VERSION = 28;
const FIRST_UPGRADABLE_SCHEMA_VERSION = 11;

const NS_APP_USER_PROFILE_50_DIR = "ProfD";
const NS_APP_PROFILE_DIR_STARTUP = "ProfDS";

// Shortcuts to transitions type.
const TRANSITION_LINK = Ci.nsINavHistoryService.TRANSITION_LINK;
const TRANSITION_TYPED = Ci.nsINavHistoryService.TRANSITION_TYPED;
const TRANSITION_BOOKMARK = Ci.nsINavHistoryService.TRANSITION_BOOKMARK;
const TRANSITION_EMBED = Ci.nsINavHistoryService.TRANSITION_EMBED;
const TRANSITION_FRAMED_LINK = Ci.nsINavHistoryService.TRANSITION_FRAMED_LINK;
const TRANSITION_REDIRECT_PERMANENT = Ci.nsINavHistoryService.TRANSITION_REDIRECT_PERMANENT;
const TRANSITION_REDIRECT_TEMPORARY = Ci.nsINavHistoryService.TRANSITION_REDIRECT_TEMPORARY;
const TRANSITION_DOWNLOAD = Ci.nsINavHistoryService.TRANSITION_DOWNLOAD;

const TITLE_LENGTH_MAX = 4096;

Cu.importGlobalProperties(["URL"]);

Cu.import("resource://gre/modules/XPCOMUtils.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "FileUtils",
                                  "resource://gre/modules/FileUtils.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "NetUtil",
                                  "resource://gre/modules/NetUtil.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "Promise",
                                  "resource://gre/modules/Promise.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "Services",
                                  "resource://gre/modules/Services.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "Task",
                                  "resource://gre/modules/Task.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "BookmarkJSONUtils",
                                  "resource://gre/modules/BookmarkJSONUtils.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "BookmarkHTMLUtils",
                                  "resource://gre/modules/BookmarkHTMLUtils.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "PlacesBackups",
                                  "resource://gre/modules/PlacesBackups.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "PlacesTestUtils",
                                  "resource://testing-common/PlacesTestUtils.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "PlacesTransactions",
                                  "resource://gre/modules/PlacesTransactions.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "OS",
                                  "resource://gre/modules/osfile.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "Sqlite",
                                  "resource://gre/modules/Sqlite.jsm");

// This imports various other objects in addition to PlacesUtils.
Cu.import("resource://gre/modules/PlacesUtils.jsm");

XPCOMUtils.defineLazyGetter(this, "SMALLPNG_DATA_URI", function() {
  return NetUtil.newURI(
         "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAA" +
         "AAAA6fptVAAAACklEQVQI12NgAAAAAgAB4iG8MwAAAABJRU5ErkJggg==");
});

let gTestDir = do_get_cwd();

// Initialize profile.
let gProfD = do_get_profile();

// Remove any old database.
clearDB();

/**
 * Shortcut to create a nsIURI.
 *
 * @param aSpec
 *        URLString of the uri.
 */
function uri(aSpec) NetUtil.newURI(aSpec);


/**
 * Gets the database connection.  If the Places connection is invalid it will
 * try to create a new connection.
 *
 * @param [optional] aForceNewConnection
 *        Forces creation of a new connection to the database.  When a
 *        connection is asyncClosed it cannot anymore schedule async statements,
 *        though connectionReady will keep returning true (Bug 726990).
 *
 * @return The database connection or null if unable to get one.
 */
let gDBConn;
function DBConn(aForceNewConnection) {
  if (!aForceNewConnection) {
    let db = PlacesUtils.history.QueryInterface(Ci.nsPIPlacesDatabase)
                                .DBConnection;
    if (db.connectionReady)
      return db;
  }

  // If the Places database connection has been closed, create a new connection.
  if (!gDBConn || aForceNewConnection) {
    let file = Services.dirsvc.get('ProfD', Ci.nsIFile);
    file.append("places.sqlite");
    let dbConn = gDBConn = Services.storage.openDatabase(file);

    // Be sure to cleanly close this connection.
    promiseTopicObserved("profile-before-change").then(() => dbConn.asyncClose());
  }

  return gDBConn.connectionReady ? gDBConn : null;
};

/**
 * Reads data from the provided inputstream.
 *
 * @return an array of bytes.
 */
function readInputStreamData(aStream) {
  let bistream = Cc["@mozilla.org/binaryinputstream;1"].
                 createInstance(Ci.nsIBinaryInputStream);
  try {
    bistream.setInputStream(aStream);
    let expectedData = [];
    let avail;
    while ((avail = bistream.available())) {
      expectedData = expectedData.concat(bistream.readByteArray(avail));
    }
    return expectedData;
  } finally {
    bistream.close();
  }
}

/**
 * Reads the data from the specified nsIFile.
 *
 * @param aFile
 *        The nsIFile to read from.
 * @return an array of bytes.
 */
function readFileData(aFile) {
  let inputStream = Cc["@mozilla.org/network/file-input-stream;1"].
                    createInstance(Ci.nsIFileInputStream);
  // init the stream as RD_ONLY, -1 == default permissions.
  inputStream.init(aFile, 0x01, -1, null);

  // Check the returned size versus the expected size.
  let size  = inputStream.available();
  let bytes = readInputStreamData(inputStream);
  if (size != bytes.length) {
    throw "Didn't read expected number of bytes";
  }
  return bytes;
}

/**
 * Reads the data from the named file, verifying the expected file length.
 *
 * @param aFileName
 *        This file should be located in the same folder as the test.
 * @param aExpectedLength
 *        Expected length of the file.
 *
 * @return The array of bytes read from the file.
 */
function readFileOfLength(aFileName, aExpectedLength) {
  let data = readFileData(do_get_file(aFileName));
  do_check_eq(data.length, aExpectedLength);
  return data;
}


/**
 * Returns the base64-encoded version of the given string.  This function is
 * similar to window.btoa, but is available to xpcshell tests also.
 *
 * @param aString
 *        Each character in this string corresponds to a byte, and must be a
 *        code point in the range 0-255.
 *
 * @return The base64-encoded string.
 */
function base64EncodeString(aString) {
  var stream = Cc["@mozilla.org/io/string-input-stream;1"]
               .createInstance(Ci.nsIStringInputStream);
  stream.setData(aString, aString.length);
  var encoder = Cc["@mozilla.org/scriptablebase64encoder;1"]
                .createInstance(Ci.nsIScriptableBase64Encoder);
  return encoder.encodeToString(stream, aString.length);
}


/**
 * Compares two arrays, and returns true if they are equal.
 *
 * @param aArray1
 *        First array to compare.
 * @param aArray2
 *        Second array to compare.
 */
function compareArrays(aArray1, aArray2) {
  if (aArray1.length != aArray2.length) {
    print("compareArrays: array lengths differ\n");
    return false;
  }

  for (let i = 0; i < aArray1.length; i++) {
    if (aArray1[i] != aArray2[i]) {
      print("compareArrays: arrays differ at index " + i + ": " +
            "(" + aArray1[i] + ") != (" + aArray2[i] +")\n");
      return false;
    }
  }

  return true;
}


/**
 * Deletes a previously created sqlite file from the profile folder.
 */
function clearDB() {
  try {
    let file = Services.dirsvc.get('ProfD', Ci.nsIFile);
    file.append("places.sqlite");
    if (file.exists())
      file.remove(false);
  } catch(ex) { dump("Exception: " + ex); }
}


/**
 * Dumps the rows of a table out to the console.
 *
 * @param aName
 *        The name of the table or view to output.
 */
function dump_table(aName)
{
  let stmt = DBConn().createStatement("SELECT * FROM " + aName);

  print("\n*** Printing data from " + aName);
  let count = 0;
  while (stmt.executeStep()) {
    let columns = stmt.numEntries;

    if (count == 0) {
      // Print the column names.
      for (let i = 0; i < columns; i++)
        dump(stmt.getColumnName(i) + "\t");
      dump("\n");
    }

    // Print the rows.
    for (let i = 0; i < columns; i++) {
      switch (stmt.getTypeOfIndex(i)) {
        case Ci.mozIStorageValueArray.VALUE_TYPE_NULL:
          dump("NULL\t");
          break;
        case Ci.mozIStorageValueArray.VALUE_TYPE_INTEGER:
          dump(stmt.getInt64(i) + "\t");
          break;
        case Ci.mozIStorageValueArray.VALUE_TYPE_FLOAT:
          dump(stmt.getDouble(i) + "\t");
          break;
        case Ci.mozIStorageValueArray.VALUE_TYPE_TEXT:
          dump(stmt.getString(i) + "\t");
          break;
      }
    }
    dump("\n");

    count++;
  }
  print("*** There were a total of " + count + " rows of data.\n");

  stmt.finalize();
}


/**
 * Checks if an address is found in the database.
 * @param aURI
 *        nsIURI or address to look for.
 * @return place id of the page or 0 if not found
 */
function page_in_database(aURI)
{
  let url = aURI instanceof Ci.nsIURI ? aURI.spec : aURI;
  let stmt = DBConn().createStatement(
    "SELECT id FROM moz_places WHERE url = :url"
  );
  stmt.params.url = url;
  try {
    if (!stmt.executeStep())
      return 0;
    return stmt.getInt64(0);
  }
  finally {
    stmt.finalize();
  }
}

/**
 * Checks how many visits exist for a specified page.
 * @param aURI
 *        nsIURI or address to look for.
 * @return number of visits found.
 */
function visits_in_database(aURI)
{
  let url = aURI instanceof Ci.nsIURI ? aURI.spec : aURI;
  let stmt = DBConn().createStatement(
    `SELECT count(*) FROM moz_historyvisits v
     JOIN moz_places h ON h.id = v.place_id
     WHERE url = :url`
  );
  stmt.params.url = url;
  try {
    if (!stmt.executeStep())
      return 0;
    return stmt.getInt64(0);
  }
  finally {
    stmt.finalize();
  }
}

/**
 * Checks that we don't have any bookmark
 */
function check_no_bookmarks() {
  let query = PlacesUtils.history.getNewQuery();
  let folders = [
    PlacesUtils.bookmarks.toolbarFolder,
    PlacesUtils.bookmarks.bookmarksMenuFolder,
    PlacesUtils.bookmarks.unfiledBookmarksFolder,
  ];
  query.setFolders(folders, 3);
  let options = PlacesUtils.history.getNewQueryOptions();
  options.queryType = Ci.nsINavHistoryQueryOptions.QUERY_TYPE_BOOKMARKS;
  let root = PlacesUtils.history.executeQuery(query, options).root;
  root.containerOpen = true;
  if (root.childCount != 0)
    do_throw("Unable to remove all bookmarks");
  root.containerOpen = false;
}

/**
 * Allows waiting for an observer notification once.
 *
 * @param aTopic
 *        Notification topic to observe.
 *
 * @return {Promise}
 * @resolves The array [aSubject, aData] from the observed notification.
 * @rejects Never.
 */
function promiseTopicObserved(aTopic)
{
  return new Promise(resolve => {
    Services.obs.addObserver(function observe(aSubject, aTopic, aData) {
      Services.obs.removeObserver(observe, aTopic);
      resolve([aSubject, aData]);
    }, aTopic, false);
  });
}

/**
 * Simulates a Places shutdown.
 */
function shutdownPlaces(aKeepAliveConnection)
{
  let hs = PlacesUtils.history.QueryInterface(Ci.nsIObserver);
  hs.observe(null, "profile-change-teardown", null);
  hs.observe(null, "profile-before-change", null);
}

const FILENAME_BOOKMARKS_HTML = "bookmarks.html";
const FILENAME_BOOKMARKS_JSON = "bookmarks-" +
  (PlacesBackups.toISODateString(new Date())) + ".json";

/**
 * Creates a bookmarks.html file in the profile folder from a given source file.
 *
 * @param aFilename
 *        Name of the file to copy to the profile folder.  This file must
 *        exist in the directory that contains the test files.
 *
 * @return nsIFile object for the file.
 */
function create_bookmarks_html(aFilename) {
  if (!aFilename)
    do_throw("you must pass a filename to create_bookmarks_html function");
  remove_bookmarks_html();
  let bookmarksHTMLFile = gTestDir.clone();
  bookmarksHTMLFile.append(aFilename);
  do_check_true(bookmarksHTMLFile.exists());
  bookmarksHTMLFile.copyTo(gProfD, FILENAME_BOOKMARKS_HTML);
  let profileBookmarksHTMLFile = gProfD.clone();
  profileBookmarksHTMLFile.append(FILENAME_BOOKMARKS_HTML);
  do_check_true(profileBookmarksHTMLFile.exists());
  return profileBookmarksHTMLFile;
}


/**
 * Remove bookmarks.html file from the profile folder.
 */
function remove_bookmarks_html() {
  let profileBookmarksHTMLFile = gProfD.clone();
  profileBookmarksHTMLFile.append(FILENAME_BOOKMARKS_HTML);
  if (profileBookmarksHTMLFile.exists()) {
    profileBookmarksHTMLFile.remove(false);
    do_check_false(profileBookmarksHTMLFile.exists());
  }
}


/**
 * Check bookmarks.html file exists in the profile folder.
 *
 * @return nsIFile object for the file.
 */
function check_bookmarks_html() {
  let profileBookmarksHTMLFile = gProfD.clone();
  profileBookmarksHTMLFile.append(FILENAME_BOOKMARKS_HTML);
  do_check_true(profileBookmarksHTMLFile.exists());
  return profileBookmarksHTMLFile;
}


/**
 * Creates a JSON backup in the profile folder folder from a given source file.
 *
 * @param aFilename
 *        Name of the file to copy to the profile folder.  This file must
 *        exist in the directory that contains the test files.
 *
 * @return nsIFile object for the file.
 */
function create_JSON_backup(aFilename) {
  if (!aFilename)
    do_throw("you must pass a filename to create_JSON_backup function");
  let bookmarksBackupDir = gProfD.clone();
  bookmarksBackupDir.append("bookmarkbackups");
  if (!bookmarksBackupDir.exists()) {
    bookmarksBackupDir.create(Ci.nsIFile.DIRECTORY_TYPE, parseInt("0755", 8));
    do_check_true(bookmarksBackupDir.exists());
  }
  let profileBookmarksJSONFile = bookmarksBackupDir.clone();
  profileBookmarksJSONFile.append(FILENAME_BOOKMARKS_JSON);
  if (profileBookmarksJSONFile.exists()) {
    profileBookmarksJSONFile.remove();
  }
  let bookmarksJSONFile = gTestDir.clone();
  bookmarksJSONFile.append(aFilename);
  do_check_true(bookmarksJSONFile.exists());
  bookmarksJSONFile.copyTo(bookmarksBackupDir, FILENAME_BOOKMARKS_JSON);
  profileBookmarksJSONFile = bookmarksBackupDir.clone();
  profileBookmarksJSONFile.append(FILENAME_BOOKMARKS_JSON);
  do_check_true(profileBookmarksJSONFile.exists());
  return profileBookmarksJSONFile;
}


/**
 * Remove bookmarksbackup dir and all backups from the profile folder.
 */
function remove_all_JSON_backups() {
  let bookmarksBackupDir = gProfD.clone();
  bookmarksBackupDir.append("bookmarkbackups");
  if (bookmarksBackupDir.exists()) {
    bookmarksBackupDir.remove(true);
    do_check_false(bookmarksBackupDir.exists());
  }
}


/**
 * Check a JSON backup file for today exists in the profile folder.
 *
 * @param aIsAutomaticBackup The boolean indicates whether it's an automatic
 *        backup.
 * @return nsIFile object for the file.
 */
function check_JSON_backup(aIsAutomaticBackup) {
  let profileBookmarksJSONFile;
  if (aIsAutomaticBackup) {
    let bookmarksBackupDir = gProfD.clone();
    bookmarksBackupDir.append("bookmarkbackups");
    let files = bookmarksBackupDir.directoryEntries;
    let backup_date = PlacesBackups.toISODateString(new Date());
    while (files.hasMoreElements()) {
      let entry = files.getNext().QueryInterface(Ci.nsIFile);
      if (PlacesBackups.filenamesRegex.test(entry.leafName)) {
        profileBookmarksJSONFile = entry;
        break;
      }
    }
  } else {
    profileBookmarksJSONFile = gProfD.clone();
    profileBookmarksJSONFile.append("bookmarkbackups");
    profileBookmarksJSONFile.append(FILENAME_BOOKMARKS_JSON);
  }
  do_check_true(profileBookmarksJSONFile.exists());
  return profileBookmarksJSONFile;
}

/**
 * Returns the frecency of a url.
 *
 * @param aURI
 *        The URI or spec to get frecency for.
 * @return the frecency value.
 */
function frecencyForUrl(aURI)
{
  let url = aURI instanceof Ci.nsIURI ? aURI.spec
                                      : aURI instanceof URL ? aURI.href
                                                            : aURI;
  let stmt = DBConn().createStatement(
    "SELECT frecency FROM moz_places WHERE url = ?1"
  );
  stmt.bindByIndex(0, url);
  try {
    if (!stmt.executeStep()) {
      throw new Error("No result for frecency.");
    }
    return stmt.getInt32(0);
  } finally {
    stmt.finalize();
  }
}

/**
 * Returns the hidden status of a url.
 *
 * @param aURI
 *        The URI or spec to get hidden for.
 * @return @return true if the url is hidden, false otherwise.
 */
function isUrlHidden(aURI)
{
  let url = aURI instanceof Ci.nsIURI ? aURI.spec : aURI;
  let stmt = DBConn().createStatement(
    "SELECT hidden FROM moz_places WHERE url = ?1"
  );
  stmt.bindByIndex(0, url);
  if (!stmt.executeStep())
    throw new Error("No result for hidden.");
  let hidden = stmt.getInt32(0);
  stmt.finalize();

  return !!hidden;
}

/**
 * Compares two times in usecs, considering eventual platform timers skews.
 *
 * @param aTimeBefore
 *        The older time in usecs.
 * @param aTimeAfter
 *        The newer time in usecs.
 * @return true if times are ordered, false otherwise.
 */
function is_time_ordered(before, after) {
  // Windows has an estimated 16ms timers precision, since Date.now() and
  // PR_Now() use different code atm, the results can be unordered by this
  // amount of time.  See bug 558745 and bug 557406.
  let isWindows = ("@mozilla.org/windows-registry-key;1" in Cc);
  // Just to be safe we consider 20ms.
  let skew = isWindows ? 20000000 : 0;
  return after - before > -skew;
}

/**
 * Shutdowns Places, invoking the callback when the connection has been closed.
 *
 * @param aCallback
 *        Function to be called when done.
 */
function waitForConnectionClosed(aCallback)
{
  promiseTopicObserved("places-connection-closed").then(aCallback);
  shutdownPlaces();
}

/**
 * Tests if a given guid is valid for use in Places or not.
 *
 * @param aGuid
 *        The guid to test.
 * @param [optional] aStack
 *        The stack frame used to report the error.
 */
function do_check_valid_places_guid(aGuid,
                                    aStack)
{
  if (!aStack) {
    aStack = Components.stack.caller;
  }
  do_check_true(/^[a-zA-Z0-9\-_]{12}$/.test(aGuid), aStack);
}

/**
 * Retrieves the guid for a given uri.
 *
 * @param aURI
 *        The uri to check.
 * @param [optional] aStack
 *        The stack frame used to report the error.
 * @return the associated the guid.
 */
function do_get_guid_for_uri(aURI,
                             aStack)
{
  if (!aStack) {
    aStack = Components.stack.caller;
  }
  let stmt = DBConn().createStatement(
    `SELECT guid
     FROM moz_places
     WHERE url = :url`
  );
  stmt.params.url = aURI.spec;
  do_check_true(stmt.executeStep(), aStack);
  let guid = stmt.row.guid;
  stmt.finalize();
  do_check_valid_places_guid(guid, aStack);
  return guid;
}

/**
 * Tests that a guid was set in moz_places for a given uri.
 *
 * @param aURI
 *        The uri to check.
 * @param [optional] aGUID
 *        The expected guid in the database.
 */
function do_check_guid_for_uri(aURI,
                               aGUID)
{
  let caller = Components.stack.caller;
  let guid = do_get_guid_for_uri(aURI, caller);
  if (aGUID) {
    do_check_valid_places_guid(aGUID, caller);
    do_check_eq(guid, aGUID, caller);
  }
}

/**
 * Retrieves the guid for a given bookmark.
 *
 * @param aId
 *        The bookmark id to check.
 * @param [optional] aStack
 *        The stack frame used to report the error.
 * @return the associated the guid.
 */
function do_get_guid_for_bookmark(aId,
                                  aStack)
{
  if (!aStack) {
    aStack = Components.stack.caller;
  }
  let stmt = DBConn().createStatement(
    `SELECT guid
     FROM moz_bookmarks
     WHERE id = :item_id`
  );
  stmt.params.item_id = aId;
  do_check_true(stmt.executeStep(), aStack);
  let guid = stmt.row.guid;
  stmt.finalize();
  do_check_valid_places_guid(guid, aStack);
  return guid;
}

/**
 * Tests that a guid was set in moz_places for a given bookmark.
 *
 * @param aId
 *        The bookmark id to check.
 * @param [optional] aGUID
 *        The expected guid in the database.
 */
function do_check_guid_for_bookmark(aId,
                                    aGUID)
{
  let caller = Components.stack.caller;
  let guid = do_get_guid_for_bookmark(aId, caller);
  if (aGUID) {
    do_check_valid_places_guid(aGUID, caller);
    do_check_eq(guid, aGUID, caller);
  }
}

/**
 * Compares 2 arrays returning whether they contains the same elements.
 *
 * @param a1
 *        First array to compare.
 * @param a2
 *        Second array to compare.
 * @param [optional] sorted
 *        Whether the comparison should take in count position of the elements.
 * @return true if the arrays contain the same elements, false otherwise.
 */
function do_compare_arrays(a1, a2, sorted)
{
  if (a1.length != a2.length)
    return false;

  if (sorted) {
    return a1.every(function (e, i) e == a2[i]);
  }
  else {
    return a1.filter(function (e) a2.indexOf(e) == -1).length == 0 &&
           a2.filter(function (e) a1.indexOf(e) == -1).length == 0;
  }
}

/**
 * Generic nsINavBookmarkObserver that doesn't implement anything, but provides
 * dummy methods to prevent errors about an object not having a certain method.
 */
function NavBookmarkObserver() {}

NavBookmarkObserver.prototype = {
  onBeginUpdateBatch: function () {},
  onEndUpdateBatch: function () {},
  onItemAdded: function () {},
  onItemRemoved: function () {},
  onItemChanged: function () {},
  onItemVisited: function () {},
  onItemMoved: function () {},
  QueryInterface: XPCOMUtils.generateQI([
    Ci.nsINavBookmarkObserver,
  ])
};

/**
 * Generic nsINavHistoryObserver that doesn't implement anything, but provides
 * dummy methods to prevent errors about an object not having a certain method.
 */
function NavHistoryObserver() {}

NavHistoryObserver.prototype = {
  onBeginUpdateBatch: function () {},
  onEndUpdateBatch: function () {},
  onVisit: function () {},
  onTitleChanged: function () {},
  onDeleteURI: function () {},
  onClearHistory: function () {},
  onPageChanged: function () {},
  onDeleteVisits: function () {},
  QueryInterface: XPCOMUtils.generateQI([
    Ci.nsINavHistoryObserver,
  ])
};

/**
 * Generic nsINavHistoryResultObserver that doesn't implement anything, but
 * provides dummy methods to prevent errors about an object not having a certain
 * method.
 */
function NavHistoryResultObserver() {}

NavHistoryResultObserver.prototype = {
  batching: function () {},
  containerStateChanged: function () {},
  invalidateContainer: function () {},
  nodeAnnotationChanged: function () {},
  nodeDateAddedChanged: function () {},
  nodeHistoryDetailsChanged: function () {},
  nodeIconChanged: function () {},
  nodeInserted: function () {},
  nodeKeywordChanged: function () {},
  nodeLastModifiedChanged: function () {},
  nodeMoved: function () {},
  nodeRemoved: function () {},
  nodeTagsChanged: function () {},
  nodeTitleChanged: function () {},
  nodeURIChanged: function () {},
  sortingChanged: function () {},
  QueryInterface: XPCOMUtils.generateQI([
    Ci.nsINavHistoryResultObserver,
  ])
};

/**
 * Asynchronously check a url is visited.
 *
 * @param aURI The URI.
 * @return {Promise}
 * @resolves When the check has been added successfully.
 * @rejects JavaScript exception.
 */
function promiseIsURIVisited(aURI) {
  let deferred = Promise.defer();

  PlacesUtils.asyncHistory.isURIVisited(aURI, function(aURI, aIsVisited) {
    deferred.resolve(aIsVisited);
  });

  return deferred.promise;
}

/**
 * Asynchronously set the favicon associated with a page.
 * @param aPageURI
 *        The page's URI
 * @param aIconURI
 *        The URI of the favicon to be set.
 */
function promiseSetIconForPage(aPageURI, aIconURI) {
  let deferred = Promise.defer();
  PlacesUtils.favicons.setAndFetchFaviconForPage(
    aPageURI, aIconURI, true,
    PlacesUtils.favicons.FAVICON_LOAD_NON_PRIVATE,
    () => { deferred.resolve(); });
  return deferred.promise;
}

function checkBookmarkObject(info) {
  do_check_valid_places_guid(info.guid);
  do_check_valid_places_guid(info.parentGuid);
  Assert.ok(typeof info.index == "number", "index should be a number");
  Assert.ok(info.dateAdded.constructor.name == "Date", "dateAdded should be a Date");
  Assert.ok(info.lastModified.constructor.name == "Date", "lastModified should be a Date");
  Assert.ok(info.lastModified >= info.dateAdded, "lastModified should never be smaller than dateAdded");
  Assert.ok(typeof info.type == "number", "type should be a number");
}

/**
 * Reads foreign_count value for a given url.
 */
function* foreign_count(url) {
  if (url instanceof Ci.nsIURI)
    url = url.spec;
  let db = yield PlacesUtils.promiseDBConnection();
  let rows = yield db.executeCached(
    `SELECT foreign_count FROM moz_places
     WHERE url = :url
    `, { url });
  return rows.length == 0 ? 0 : rows[0].getResultByName("foreign_count");
}