gecko/toolkit/components/url-classifier/public/nsIUrlClassifierDBService.idl

/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (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.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Url Classifier code
 *
 * The Initial Developer of the Original Code is
 * Google Inc.
 * Portions created by the Initial Developer are Copyright (C) 2006
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Tony Chang <tony@ponderer.org> (original author)
 *   Brett Wilson <brettw@gmail.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#include "nsISupports.idl"

// Interface for JS function callbacks
[scriptable, function, uuid(4ca27b6b-a674-4b3d-ab30-d21e2da2dffb)]
interface nsIUrlClassifierCallback : nsISupports {
  void handleEvent(in ACString value);
};

/**
 * The nsIUrlClassifierUpdateObserver interface is implemented by
 * clients streaming updates to the url-classifier (usually
 * nsUrlClassifierStreamUpdater.
 */
[scriptable, uuid(113671b8-c5cc-47d9-bc57-269568c7ce29)]
interface nsIUrlClassifierUpdateObserver : nsISupports {
  /**
   * The update requested a new URL whose contents should be downloaded
   * and sent to the classifier as a new stream
   */
  void updateUrlRequested(in ACString url);

  /* A stream update has completed */
  void streamFinished();

  /* The update has encountered an error and should be cancelled */
  void updateError(in nsresult error);

  /**
   * The update has completed successfully.
   *
   * @param requestedTimeout The number of seconds that the caller should
   *                         wait before trying to update again.
   **/
  void updateSuccess(in unsigned long requestedTimeout);
};

/**
 * This is a proxy class that is instantiated and called from the JS thread.
 * It provides async methods for querying and updating the database.  As the
 * methods complete, they call the callback function.
 */
[scriptable, uuid(dc3b958e-b345-458d-83f7-77e82b42a514)]
interface nsIUrlClassifierDBService : nsISupports
{
  /**
   * Looks up a key in the database.
   *
   * @param key: The URL to search for.  This URL will be canonicalized
   *        by the service.
   * @param c: The callback will be called with a comma-separated list
   *        of tables to which the key belongs.
   * @param needsProxy: Should be true if the callback needs to be called
   *        in the main thread, false if the callback is threadsafe.
   */
  void lookup(in ACString spec,
              in nsIUrlClassifierCallback c,
              in boolean needsProxy);

  /**
   * Lists the tables along with which chunks are available in each table.
   * This list is in the format of the request body:
   *   tablename;chunkdata\n
   *   tablename2;chunkdata2\n
   *
   * For example:
   *   goog-phish-regexp;a:10,14,30-40s:56,67
   *   goog-white-regexp;a:1-3,5
   */
  void getTables(in nsIUrlClassifierCallback c);

  ////////////////////////////////////////////////////////////////////////////
  // Incremental update methods.
  //
  // An update to the database has the following steps:
  //
  // 1) The update process is started with beginUpdate().  The client
  //    passes an nsIUrlClassifierUpdateObserver object which will be
  //    notified as the update is processed by the dbservice.
  // 2) The client sends an initial update stream to the dbservice,
  //    using beginStream/updateStream/finishStream.
  // 3) While reading this initial update stream, the dbservice may
  //    request additional streams from the client as requested by the
  //    update stream.
  // 4) For each additional update stream, the client feeds the
  //    contents to the dbservice using beginStream/updateStream/endStream.
  // 5) Once all streams have been processed, the client calls
  //    finishUpdate.  When the dbservice has finished processing
  //    all streams, it will notify the observer that the update process
  //    is complete.

  /**
   * Begin an update process.  Will throw NS_ERROR_NOT_AVAILABLE if there
   * is already an update in progress.
   */
  void beginUpdate(in nsIUrlClassifierUpdateObserver updater);

  /**
   * Begin a stream update.  This should be called once per url being
   * fetched.
   */
  void beginStream();

  /**
   * Update the table incrementally.
   */
  void updateStream(in ACString updateChunk);

  // It would be nice to have an updateFromStream method to round out the
  // interface, but it's tricky because of XPCOM proxies.

  /**
   * Finish an individual stream update.  Must be called for every
   * beginStream() call, before the next beginStream() or finishUpdate().
   *
   * The update observer's streamFinished will be called once the
   * stream has been processed.
   */
  void finishStream();

  /**
   * Finish an incremental update.  This will attempt to commit any
   * pending changes and resets the update interface.
   *
   * The update observer's updateSucceeded or updateError methods
   * will be called when the update has been processed.
   */
  void finishUpdate();

  /**
   * Cancel an incremental update.  This rolls back any pending changes.
   * and resets the update interface.
   *
   * The update observer's updateError method will be called when the
   * update has been rolled back.
   */
  void cancelUpdate();

  /**
   * Reset the url-classifier database.  This call will delete the existing
   * database, emptying all tables.  Mostly intended for use in unit tests.
   */
  void resetDatabase();
};

/**
 * Interface for the actual worker thread.  Implementations of this need not
 * be thread aware and just work on the database.
 */
[scriptable, uuid(3ed0c8f9-a5d8-4186-beb1-5d828e95ea90)]
interface nsIUrlClassifierDBServiceWorker : nsIUrlClassifierDBService
{
  // Provide a way to forcibly close the db connection.
  void closeDb();
};