beagled/IndexSynchronization.cs

   1 //
   2 // IndexSynchronization.cs
   3 //
   4 // Copyright (C) 2005 Novell, Inc.
   5 //
   6
   7 //
   8 // Permission is hereby granted, free of charge, to any person obtaining a
   9 // copy of this software and associated documentation files (the "Software"),
  10 // to deal in the Software without restriction, including without limitation
  11 // the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12 // and/or sell copies of the Software, and to permit persons to whom the
  13 // Software is furnished to do so, subject to the following conditions:
  14 //
  15 // The above copyright notice and this permission notice shall be included in
  16 // all copies or substantial portions of the Software.
  17 //
  18 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  21 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  23 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  24 // DEALINGS IN THE SOFTWARE.
  25 //
  26
  27 using System;
  28 using System.IO;
  29 using System.Collections;
  30 using System.Threading;
  31
  32 using Beagle.Util;
  33
  34 namespace Beagle.Daemon {
  35
  36         public class IndexSynchronization {
  37
  38                 // 1 hour synchronization period
  39                 static private int sync_interval_in_minutes = 60;
  40
  41                 // Synchonization lock object
  42                 static private object synchronization_lock = new object ();
  43
  44                 // Original index storage directory
  45                 static private string remote_index_dir = Path.Combine (PathFinder.StorageDir, "Indexes");
  46
  47                 ////////////////////////////////////////////////////////////////
  48
  49                 public enum SynchronizationTarget {
  50                         Local,
  51                         Remote
  52                 }
  53
  54                 static public void Initialize ()
  55                 {
  56                         Logger.Log.Debug ("Initializing index synchronization");
  57
  58                         if (! Directory.Exists (remote_index_dir))
  59                                 Directory.CreateDirectory (remote_index_dir);
  60
  61                         // Initial index synchronization
  62                         Synchronize (SynchronizationTarget.Local);
  63
  64                         Scheduler.Task task;
  65
  66                         // Add the synchronization task to the scheduler
  67                         task = Scheduler.TaskFromHook (new Scheduler.TaskHook (SynchronizeHook));
  68                         task.Tag = "Synchronize Indexes";
  69                         task.Priority = Scheduler.Priority.Delayed;
  70                         task.TriggerTime = DateTime.Now.AddMinutes (sync_interval_in_minutes);
  71                         task.Source = synchronization_lock;
  72                         Scheduler.Global.Add (task);
  73
  74                         // Set up the shutdown synchronization task
  75                         task = Scheduler.TaskFromHook (new Scheduler.TaskHook (ShutdownHook));
  76                         task.Tag = "Synchronize Indexes on Shutdown";
  77                         task.Priority = Scheduler.Priority.Shutdown;
  78                         task.Source = synchronization_lock;
  79                         Scheduler.Global.Add (task);
  80                 }
  81
  82                 ////////////////////////////////////////////////////////////////
  83
  84                 static public void Synchronize (SynchronizationTarget target)
  85                 {
  86                         Stopwatch watch = new Stopwatch ();
  87                         watch.Start ();
  88
  89                         lock (synchronization_lock) {
  90                                 Logger.Log.Debug ("Synchronizing... (target={0})", target);
  91
  92                                 DirectoryInfo source_directory, target_directory;
  93                                 source_directory = new DirectoryInfo ((target == SynchronizationTarget.Local) ? remote_index_dir : PathFinder.IndexDir);
  94                                 target_directory = new DirectoryInfo ((target == SynchronizationTarget.Local) ? PathFinder.IndexDir : remote_index_dir);
  95
  96                                 if (SynchronizeDirectory (source_directory, target_directory))
  97                                         Logger.Log.Debug ("Synchronized successfully in {0}", watch);
  98                         }
  99                 }
 100
 101                 ////////////////////////////////////////////////////////////////
 102
 103                 static private void SynchronizeHook (Scheduler.Task task)
 104                 {
 105                         try {
 106                                 Synchronize (SynchronizationTarget.Remote);
 107                         } catch (Exception ex) {
 108                                 Logger.Log.Error (ex, "Caught exception while synchronizing");
 109                         }
 110
 111                         task.Reschedule = true;
 112                         task.TriggerTime = DateTime.Now.AddMinutes (sync_interval_in_minutes);
 113                 }
 114
 115                 static private void ShutdownHook (Scheduler.Task task)
 116                 {
 117                         try {
 118                                 Synchronize (SynchronizationTarget.Remote);
 119
 120                                 // FIXME: This may not be safe to do here
 121                                 Logger.Log.Debug ("Purging locally synchronized indexes");
 122                                 Directory.Delete (PathFinder.IndexDir, true);
 123                         } catch (Exception ex) {
 124                                 Logger.Log.Error (ex, "Caught exception while doing shutdown synchronization");
 125                         }
 126                 }
 127
 128                 ////////////////////////////////////////////////////////////////
 129
 130                 // FIXME: Non-Getto synchronization
 131                 static private bool SynchronizeDirectory (DirectoryInfo source_directory,
 132                                                           DirectoryInfo target_directory)
 133                 {
 134                         if (! source_directory.Exists)
 135                                 throw new Exception ("Synchronization error: Source directory does not exist");
 136
 137                         DirectoryInfo target_directory_temp, target_directory_trash;
 138
 139                         // Setup directories for the copy/move/move/delete procedure
 140                         target_directory_temp = new DirectoryInfo (target_directory.FullName + ".tmp");
 141                         target_directory_trash = new DirectoryInfo (target_directory.FullName + ".trash");
 142
 143                         if (target_directory_temp.Exists)
 144                                 target_directory_temp.Delete (true);
 145                         target_directory_temp.Create ();
 146
 147                         try {
 148                                 // Copy the directory structure and files
 149                                 CopyDirectoryRecursively (source_directory, target_directory_temp);
 150
 151                                 if (target_directory_trash.Exists)
 152                                         target_directory_trash.Delete (true);
 153
 154                                 target_directory.MoveTo (target_directory_trash.FullName);
 155                                 target_directory_temp.MoveTo (target_directory.FullName);
 156
 157                                 target_directory_trash.Delete (true);
 158                         } catch (Exception ex) {
 159                                 Logger.Log.Error (ex, "Caught error while synchronizing directory");
 160                                 return false;
 161                         }
 162
 163                         return true;
 164                 }
 165
 166                 static private void CopyDirectoryRecursively (DirectoryInfo source_directory,
 167                                                               DirectoryInfo target_directory)
 168                 {
 169                         if (!target_directory.Exists)
 170                                 target_directory.Create ();
 171
 172                         foreach (FileInfo source_file in DirectoryWalker.GetFileInfos (source_directory)) {
 173                                 FileInfo target_file = new FileInfo (Path.Combine (target_directory.FullName, source_file.Name));
 174
 175                                 // FIXME: Don't hard code filenames - Mono.Posix.StatMode.Regular
 176                                 if (source_file.Name.IndexOf ("socket") != -1 ||
 177                                     source_file.Name.EndsWith ("-journal"))
 178                                         continue;
 179
 180                                 File.Copy (source_file.FullName, target_file.FullName, true);
 181                         }
 182
 183                         foreach (DirectoryInfo source_child_directory in DirectoryWalker.GetDirectoryInfos (source_directory)) {
 184                                 DirectoryInfo target_child_directory = new DirectoryInfo (Path.Combine (target_directory.FullName, source_child_directory.Name));
 185
 186                                 CopyDirectoryRecursively (source_child_directory,
 187                                                           target_child_directory);
 188                         }
 189                 }
 190         }
 191 }