code.grnet.gr Git - pithos-ms-client/blob - trunk/Pithos.Core/Agents/NetworkAgent.cs

   1 #region
   2 /* -----------------------------------------------------------------------
   3  * <copyright file="NetworkAgent.cs" company="GRNet">
   4  *
   5  * Copyright 2011-2012 GRNET S.A. All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or
   8  * without modification, are permitted provided that the following
   9  * conditions are met:
  10  *
  11  *   1. Redistributions of source code must retain the above
  12  *      copyright notice, this list of conditions and the following
  13  *      disclaimer.
  14  *
  15  *   2. Redistributions in binary form must reproduce the above
  16  *      copyright notice, this list of conditions and the following
  17  *      disclaimer in the documentation and/or other materials
  18  *      provided with the distribution.
  19  *
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
  22  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  23  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  24  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
  25  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  28  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  31  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  32  * POSSIBILITY OF SUCH DAMAGE.
  33  *
  34  * The views and conclusions contained in the software and
  35  * documentation are those of the authors and should not be
  36  * interpreted as representing official policies, either expressed
  37  * or implied, of GRNET S.A.
  38  * </copyright>
  39  * -----------------------------------------------------------------------
  40  */
  41 #endregion
  42
  43 //TODO: Now there is a UUID tag. This can be used for renames/moves
  44
  45
  46 using System;
  47 using System.Collections.Concurrent;
  48 using System.Collections.Generic;
  49 using System.ComponentModel.Composition;
  50 using System.Diagnostics;
  51 using System.Diagnostics.Contracts;
  52 using System.IO;
  53 using System.Linq;
  54 using System.Net;
  55 using System.Threading;
  56 using System.Threading.Tasks;
  57 using System.Threading.Tasks.Dataflow;
  58 using Castle.ActiveRecord;
  59 using Pithos.Interfaces;
  60 using Pithos.Network;
  61 using log4net;
  62
  63 namespace Pithos.Core.Agents
  64 {
  65     //TODO: Ensure all network operations use exact casing. Pithos is case sensitive
  66     [Export]
  67     public class NetworkAgent
  68     {
  69         private Agent<CloudAction> _agent;
  70
  71         [System.ComponentModel.Composition.Import]
  72         private DeleteAgent _deleteAgent=new DeleteAgent();
  73
  74         [System.ComponentModel.Composition.Import]
  75         public IStatusKeeper StatusKeeper { get; set; }
  76
  77         public IStatusNotification StatusNotification { get; set; }
  78
  79         private static readonly ILog Log = LogManager.GetLogger("NetworkAgent");
  80
  81         private readonly ConcurrentBag<AccountInfo> _accounts = new ConcurrentBag<AccountInfo>();
  82
  83         [System.ComponentModel.Composition.Import]
  84         public IPithosSettings Settings { get; set; }
  85
  86         //The Pause event stops the poll agent to give priority to the network agent
  87         //Initially the event is signalled because we don't need to pause
  88         private readonly AsyncManualResetEvent _pauseEvent = new AsyncManualResetEvent(true);
  89
  90         public AsyncManualResetEvent PauseEvent
  91         {
  92             get { return _pauseEvent; }
  93         }
  94
  95
  96         public void Start()
  97         {
  98             _agent = Agent<CloudAction>.Start(inbox =>
  99             {
 100                 Action loop = null;
 101                 loop = () =>
 102                 {
 103                     _deleteAgent.PauseEvent.Wait();
 104                     var message = inbox.Receive();
 105                     var process=message.Then(Process,inbox.CancellationToken);
 106                     inbox.LoopAsync(process, loop);
 107                 };
 108                 loop();
 109             });
 110
 111         }
 112
 113         private async Task Process(CloudAction action)
 114         {
 115             if (action == null)
 116                 throw new ArgumentNullException("action");
 117             if (action.AccountInfo==null)
 118                 throw new ArgumentException("The action.AccountInfo is empty","action");
 119             Contract.EndContractBlock();
 120
 121
 122
 123
 124             using (log4net.ThreadContext.Stacks["NETWORK"].Push("PROCESS"))
 125             {
 126                 Log.InfoFormat("[ACTION] Start Processing {0}", action);
 127
 128                 var cloudFile = action.CloudFile;
 129                 var downloadPath = action.GetDownloadPath();
 130
 131                 try
 132                 {
 133                     _pauseEvent.Reset();
 134                     UpdateStatus(PithosStatus.Syncing);
 135                     var accountInfo = action.AccountInfo;
 136
 137                     if (action.Action == CloudActionType.DeleteCloud)
 138                     {
 139                         //Redirect deletes to the delete agent
 140                         _deleteAgent.Post((CloudDeleteAction)action);
 141                     }
 142                     if (_deleteAgent.IsDeletedFile(action))
 143                     {
 144                         //Clear the status of already deleted files to avoid reprocessing
 145                         if (action.LocalFile != null)
 146                             this.StatusKeeper.ClearFileStatus(action.LocalFile.FullName);
 147                     }
 148                     else
 149                     {
 150                         switch (action.Action)
 151                         {
 152                             case CloudActionType.UploadUnconditional:
 153                                 //Abort if the file was deleted before we reached this point
 154                                 await UploadCloudFile(action);
 155                                 break;
 156                             case CloudActionType.DownloadUnconditional:
 157                                 await DownloadCloudFile(accountInfo, cloudFile, downloadPath);
 158                                 break;
 159                             case CloudActionType.RenameCloud:
 160                                 var moveAction = (CloudMoveAction)action;
 161                                 RenameCloudFile(accountInfo, moveAction);
 162                                 break;
 163                             case CloudActionType.MustSynch:
 164                                 if (!File.Exists(downloadPath) && !Directory.Exists(downloadPath))
 165                                 {
 166                                     await DownloadCloudFile(accountInfo, cloudFile, downloadPath);
 167                                 }
 168                                 else
 169                                 {
 170                                     await SyncFiles(accountInfo, action);
 171                                 }
 172                                 break;
 173                         }
 174                     }
 175                     Log.InfoFormat("[ACTION] End Processing {0}:{1}->{2}", action.Action, action.LocalFile,
 176                                            action.CloudFile.Name);
 177                 }
 178                 catch (WebException exc)
 179                 {
 180                     Log.ErrorFormat("[WEB ERROR] {0} : {1} -> {2} due to exception\r\n{3}", action.Action, action.LocalFile, action.CloudFile, exc);
 181                 }
 182                 catch (OperationCanceledException)
 183                 {
 184                     throw;
 185                 }
 186                 catch (DirectoryNotFoundException)
 187                 {
 188                     Log.ErrorFormat("{0} : {1} -> {2}  failed because the directory was not found.\n Rescheduling a delete",
 189                         action.Action, action.LocalFile, action.CloudFile);
 190                     //Post a delete action for the missing file
 191                     Post(new CloudDeleteAction(action));
 192                 }
 193                 catch (FileNotFoundException)
 194                 {
 195                     Log.ErrorFormat("{0} : {1} -> {2}  failed because the file was not found.\n Rescheduling a delete",
 196                         action.Action, action.LocalFile, action.CloudFile);
 197                     //Post a delete action for the missing file
 198                     Post(new CloudDeleteAction(action));
 199                 }
 200                 catch (Exception exc)
 201                 {
 202                     Log.ErrorFormat("[REQUEUE] {0} : {1} -> {2} due to exception\r\n{3}",
 203                                      action.Action, action.LocalFile, action.CloudFile, exc);
 204
 205                     _agent.Post(action);
 206                 }
 207                 finally
 208                 {
 209                     if (_agent.IsEmpty)
 210                         _pauseEvent.Set();
 211                     UpdateStatus(PithosStatus.InSynch);
 212                 }
 213             }
 214         }
 215
 216         private void UpdateStatus(PithosStatus status)
 217         {
 218             StatusKeeper.SetPithosStatus(status);
 219             StatusNotification.Notify(new Notification());
 220         }
 221
 222
 223         private async Task SyncFiles(AccountInfo accountInfo,CloudAction action)
 224         {
 225             if (accountInfo == null)
 226                 throw new ArgumentNullException("accountInfo");
 227             if (action==null)
 228                 throw new ArgumentNullException("action");
 229             if (action.LocalFile==null)
 230                 throw new ArgumentException("The action's local file is not specified","action");
 231             if (!Path.IsPathRooted(action.LocalFile.FullName))
 232                 throw new ArgumentException("The action's local file path must be absolute","action");
 233             if (action.CloudFile== null)
 234                 throw new ArgumentException("The action's cloud file is not specified", "action");
 235             Contract.EndContractBlock();
 236
 237             var localFile = action.LocalFile;
 238             var cloudFile = action.CloudFile;
 239             var downloadPath=action.LocalFile.GetProperCapitalization();
 240
 241             var cloudHash = cloudFile.Hash.ToLower();
 242             var localHash = action.LocalHash.Value.ToLower();
 243             var topHash = action.TopHash.Value.ToLower();
 244
 245             //Not enough to compare only the local hashes, also have to compare the tophashes
 246
 247             //If any of the hashes match, we are done
 248             if ((cloudHash == localHash || cloudHash == topHash))
 249             {
 250                 Log.InfoFormat("Skipping {0}, hashes match",downloadPath);
 251                 return;
 252             }
 253
 254             //The hashes DON'T match. We need to sync
 255             var lastLocalTime = localFile.LastWriteTime;
 256             var lastUpTime = cloudFile.Last_Modified;
 257
 258             //If the local file is newer upload it
 259             if (lastUpTime <= lastLocalTime)
 260             {
 261                 //It probably means it was changed while the app was down
 262                 UploadCloudFile(action);
 263             }
 264             else
 265             {
 266                 //It the cloud file has a later date, it was modified by another user or computer.
 267                 //We need to check the local file's status
 268                 var status = StatusKeeper.GetFileStatus(downloadPath);
 269                 switch (status)
 270                 {
 271                     case FileStatus.Unchanged:
 272                         //If the local file's status is Unchanged, we can go on and download the newer cloud file
 273                         await DownloadCloudFile(accountInfo,cloudFile,downloadPath);
 274                         break;
 275                     case FileStatus.Modified:
 276                         //If the local file is Modified, we may have a conflict. In this case we should mark the file as Conflict
 277                         //We can't ensure that a file modified online since the last time will appear as Modified, unless we
 278                         //index all files before we start listening.
 279                     case FileStatus.Created:
 280                         //If the local file is Created, it means that the local and cloud files aren't related,
 281                         // yet they have the same name.
 282
 283                         //In both cases we must mark the file as in conflict
 284                         ReportConflict(downloadPath);
 285                         break;
 286                     default:
 287                         //Other cases should never occur. Mark them as Conflict as well but log a warning
 288                         ReportConflict(downloadPath);
 289                         Log.WarnFormat("Unexcepted status {0} for file {1}->{2}", status,
 290                                        downloadPath, action.CloudFile.Name);
 291                         break;
 292                 }
 293             }
 294         }
 295
 296         private void ReportConflict(string downloadPath)
 297         {
 298             if (String.IsNullOrWhiteSpace(downloadPath))
 299                 throw new ArgumentNullException("downloadPath");
 300             Contract.EndContractBlock();
 301
 302             StatusKeeper.SetFileOverlayStatus(downloadPath, FileOverlayStatus.Conflict);
 303             UpdateStatus(PithosStatus.HasConflicts);
 304             var message = String.Format("Conflict detected for file {0}", downloadPath);
 305             Log.Warn(message);
 306             StatusNotification.NotifyChange(message, TraceLevel.Warning);
 307         }
 308
 309         public void Post(CloudAction cloudAction)
 310         {
 311             if (cloudAction == null)
 312                 throw new ArgumentNullException("cloudAction");
 313             if (cloudAction.AccountInfo==null)
 314                 throw new ArgumentException("The CloudAction.AccountInfo is empty","cloudAction");
 315             Contract.EndContractBlock();
 316
 317             _deleteAgent.PauseEvent.Wait();
 318
 319             //If the action targets a local file, add a treehash calculation
 320             if (!(cloudAction is CloudDeleteAction) && cloudAction.LocalFile as FileInfo != null)
 321             {
 322                 var accountInfo = cloudAction.AccountInfo;
 323                 var localFile = (FileInfo) cloudAction.LocalFile;
 324                 if (localFile.Length > accountInfo.BlockSize)
 325                     cloudAction.TopHash =
 326                         new Lazy<string>(() => Signature.CalculateTreeHashAsync(localFile,
 327                                                                                 accountInfo.BlockSize,
 328                                                                                 accountInfo.BlockHash, Settings.HashingParallelism).Result
 329                                                     .TopHash.ToHashString());
 330                 else
 331                 {
 332                     cloudAction.TopHash = new Lazy<string>(() => cloudAction.LocalHash.Value);
 333                 }
 334             }
 335             else
 336             {
 337                 //The hash for a directory is the empty string
 338                 cloudAction.TopHash = new Lazy<string>(() => String.Empty);
 339             }
 340
 341             if (cloudAction is CloudDeleteAction)
 342                 _deleteAgent.Post((CloudDeleteAction)cloudAction);
 343             else
 344                 _agent.Post(cloudAction);
 345         }
 346
 347
 348         public IEnumerable<CloudAction> GetEnumerable()
 349         {
 350             return _agent.GetEnumerable();
 351         }
 352
 353         public Task GetDeleteAwaiter()
 354         {
 355             return _deleteAgent.PauseEvent.WaitAsync();
 356         }
 357         public CancellationToken CancellationToken
 358         {
 359             get { return _agent.CancellationToken; }
 360         }
 361
 362         private static FileAgent GetFileAgent(AccountInfo accountInfo)
 363         {
 364             return AgentLocator<FileAgent>.Get(accountInfo.AccountPath);
 365         }
 366
 367
 368
 369         private void RenameCloudFile(AccountInfo accountInfo,CloudMoveAction action)
 370         {
 371             if (accountInfo==null)
 372                 throw new ArgumentNullException("accountInfo");
 373             if (action==null)
 374                 throw new ArgumentNullException("action");
 375             if (action.CloudFile==null)
 376                 throw new ArgumentException("CloudFile","action");
 377             if (action.LocalFile==null)
 378                 throw new ArgumentException("LocalFile","action");
 379             if (action.OldLocalFile==null)
 380                 throw new ArgumentException("OldLocalFile","action");
 381             if (action.OldCloudFile==null)
 382                 throw new ArgumentException("OldCloudFile","action");
 383             Contract.EndContractBlock();
 384
 385
 386             var newFilePath = action.LocalFile.FullName;
 387
 388             //How do we handle concurrent renames and deletes/uploads/downloads?
 389             //* A conflicting upload means that a file was renamed before it had a chance to finish uploading
 390             //  This should never happen as the network agent executes only one action at a time
 391             //* A conflicting download means that the file was modified on the cloud. While we can go on and complete
 392             //  the rename, there may be a problem if the file is downloaded in blocks, as subsequent block requests for the
 393             //  same name will fail.
 394             //  This should never happen as the network agent executes only one action at a time.
 395             //* A conflicting delete can happen if the rename was followed by a delete action that didn't have the chance
 396             //  to remove the rename from the queue.
 397             //  We can probably ignore this case. It will result in an error which should be ignored
 398
 399
 400             //The local file is already renamed
 401             StatusKeeper.SetFileOverlayStatus(newFilePath, FileOverlayStatus.Modified);
 402
 403
 404             var account = action.CloudFile.Account ?? accountInfo.UserName;
 405             var container = action.CloudFile.Container;
 406
 407             var client = new CloudFilesClient(accountInfo);
 408             //TODO: What code is returned when the source file doesn't exist?
 409             client.MoveObject(account, container, action.OldCloudFile.Name, container, action.CloudFile.Name);
 410
 411             StatusKeeper.SetFileStatus(newFilePath, FileStatus.Unchanged);
 412             StatusKeeper.SetFileOverlayStatus(newFilePath, FileOverlayStatus.Normal);
 413             NativeMethods.RaiseChangeNotification(newFilePath);
 414         }
 415
 416         //Download a file.
 417         private async Task DownloadCloudFile(AccountInfo accountInfo, ObjectInfo cloudFile , string filePath)
 418         {
 419             if (accountInfo == null)
 420                 throw new ArgumentNullException("accountInfo");
 421             if (cloudFile == null)
 422                 throw new ArgumentNullException("cloudFile");
 423             if (String.IsNullOrWhiteSpace(cloudFile.Account))
 424                 throw new ArgumentNullException("cloudFile");
 425             if (String.IsNullOrWhiteSpace(cloudFile.Container))
 426                 throw new ArgumentNullException("cloudFile");
 427             if (String.IsNullOrWhiteSpace(filePath))
 428                 throw new ArgumentNullException("filePath");
 429             if (!Path.IsPathRooted(filePath))
 430                 throw new ArgumentException("The filePath must be rooted", "filePath");
 431             Contract.EndContractBlock();
 432
 433
 434             var localPath = Interfaces.FileInfoExtensions.GetProperFilePathCapitalization(filePath);
 435             var relativeUrl = new Uri(cloudFile.Name, UriKind.Relative);
 436
 437             var url = relativeUrl.ToString();
 438             if (cloudFile.Name.EndsWith(".ignore", StringComparison.InvariantCultureIgnoreCase))
 439                 return;
 440
 441
 442             //Are we already downloading or uploading the file?
 443             using (var gate=NetworkGate.Acquire(localPath, NetworkOperation.Downloading))
 444             {
 445                 if (gate.Failed)
 446                     return;
 447
 448                 var client = new CloudFilesClient(accountInfo);
 449                 var account = cloudFile.Account;
 450                 var container = cloudFile.Container;
 451
 452                 if (cloudFile.Content_Type == @"application/directory")
 453                 {
 454                     if (!Directory.Exists(localPath))
 455                         Directory.CreateDirectory(localPath);
 456                 }
 457                 else
 458                 {
 459                     //Retrieve the hashmap from the server
 460                     var serverHash = await client.GetHashMap(account, container, url);
 461                     //If it's a small file
 462                     if (serverHash.Hashes.Count == 1)
 463                         //Download it in one go
 464                         await
 465                             DownloadEntireFileAsync(accountInfo, client, cloudFile, relativeUrl, localPath, serverHash);
 466                         //Otherwise download it block by block
 467                     else
 468                         await DownloadWithBlocks(accountInfo, client, cloudFile, relativeUrl, localPath, serverHash);
 469
 470                     if (cloudFile.AllowedTo == "read")
 471                     {
 472                         var attributes = File.GetAttributes(localPath);
 473                         File.SetAttributes(localPath, attributes | FileAttributes.ReadOnly);
 474                     }
 475                 }
 476
 477                 //Now we can store the object's metadata without worrying about ghost status entries
 478                 StatusKeeper.StoreInfo(localPath, cloudFile);
 479
 480             }
 481         }
 482
 483         //Download a small file with a single GET operation
 484         private async Task DownloadEntireFileAsync(AccountInfo accountInfo, CloudFilesClient client, ObjectInfo cloudFile, Uri relativeUrl, string filePath,TreeHash serverHash)
 485         {
 486             if (client == null)
 487                 throw new ArgumentNullException("client");
 488             if (cloudFile==null)
 489                 throw new ArgumentNullException("cloudFile");
 490             if (relativeUrl == null)
 491                 throw new ArgumentNullException("relativeUrl");
 492             if (String.IsNullOrWhiteSpace(filePath))
 493                 throw new ArgumentNullException("filePath");
 494             if (!Path.IsPathRooted(filePath))
 495                 throw new ArgumentException("The localPath must be rooted", "filePath");
 496             Contract.EndContractBlock();
 497
 498             var localPath = Pithos.Interfaces.FileInfoExtensions.GetProperFilePathCapitalization(filePath);
 499             //If the file already exists
 500             if (File.Exists(localPath))
 501             {
 502                 //First check with MD5 as this is a small file
 503                 var localMD5 = Signature.CalculateMD5(localPath);
 504                 var cloudHash=serverHash.TopHash.ToHashString();
 505                 if (localMD5==cloudHash)
 506                     return;
 507                 //Then check with a treehash
 508                 var localTreeHash = Signature.CalculateTreeHash(localPath, serverHash.BlockSize, serverHash.BlockHash);
 509                 var localHash = localTreeHash.TopHash.ToHashString();
 510                 if (localHash==cloudHash)
 511                     return;
 512             }
 513             StatusNotification.Notify(new CloudNotification { Data = cloudFile });
 514
 515             var fileAgent = GetFileAgent(accountInfo);
 516             //Calculate the relative file path for the new file
 517             var relativePath = relativeUrl.RelativeUriToFilePath();
 518             //The file will be stored in a temporary location while downloading with an extension .download
 519             var tempPath = Path.Combine(fileAgent.CachePath, relativePath + ".download");
 520             //Make sure the target folder exists. DownloadFileTask will not create the folder
 521             var tempFolder = Path.GetDirectoryName(tempPath);
 522             if (!Directory.Exists(tempFolder))
 523                 Directory.CreateDirectory(tempFolder);
 524
 525             //Download the object to the temporary location
 526             await client.GetObject(cloudFile.Account, cloudFile.Container, relativeUrl.ToString(), tempPath);
 527
 528             //Create the local folder if it doesn't exist (necessary for shared objects)
 529             var localFolder = Path.GetDirectoryName(localPath);
 530             if (!Directory.Exists(localFolder))
 531                 Directory.CreateDirectory(localFolder);
 532             //And move it to its actual location once downloading is finished
 533             if (File.Exists(localPath))
 534                 File.Replace(tempPath,localPath,null,true);
 535             else
 536                 File.Move(tempPath,localPath);
 537             //Notify listeners that a local file has changed
 538             StatusNotification.NotifyChangedFile(localPath);
 539
 540
 541         }
 542
 543         //Download a file asynchronously using blocks
 544         public async Task DownloadWithBlocks(AccountInfo accountInfo, CloudFilesClient client, ObjectInfo cloudFile, Uri relativeUrl, string filePath, TreeHash serverHash)
 545         {
 546             if (client == null)
 547                 throw new ArgumentNullException("client");
 548             if (cloudFile == null)
 549                 throw new ArgumentNullException("cloudFile");
 550             if (relativeUrl == null)
 551                 throw new ArgumentNullException("relativeUrl");
 552             if (String.IsNullOrWhiteSpace(filePath))
 553                 throw new ArgumentNullException("filePath");
 554             if (!Path.IsPathRooted(filePath))
 555                 throw new ArgumentException("The filePath must be rooted", "filePath");
 556             if (serverHash == null)
 557                 throw new ArgumentNullException("serverHash");
 558             Contract.EndContractBlock();
 559
 560            var fileAgent = GetFileAgent(accountInfo);
 561             var localPath = Interfaces.FileInfoExtensions.GetProperFilePathCapitalization(filePath);
 562
 563             //Calculate the relative file path for the new file
 564             var relativePath = relativeUrl.RelativeUriToFilePath();
 565             var blockUpdater = new BlockUpdater(fileAgent.CachePath, localPath, relativePath, serverHash);
 566
 567
 568
 569             //Calculate the file's treehash
 570             var treeHash = await Signature.CalculateTreeHashAsync(localPath, serverHash.BlockSize, serverHash.BlockHash, 2);
 571
 572             //And compare it with the server's hash
 573             var upHashes = serverHash.GetHashesAsStrings();
 574             var localHashes = treeHash.HashDictionary;
 575             for (int i = 0; i < upHashes.Length; i++)
 576             {
 577                 //For every non-matching hash
 578                 var upHash = upHashes[i];
 579                 if (!localHashes.ContainsKey(upHash))
 580                 {
 581                     StatusNotification.Notify(new CloudNotification { Data = cloudFile });
 582
 583                     if (blockUpdater.UseOrphan(i, upHash))
 584                     {
 585                         Log.InfoFormat("[BLOCK GET] ORPHAN FOUND for {0} of {1} for {2}", i, upHashes.Length, localPath);
 586                         continue;
 587                     }
 588                     Log.InfoFormat("[BLOCK GET] START {0} of {1} for {2}", i, upHashes.Length, localPath);
 589                     var start = i*serverHash.BlockSize;
 590                     //To download the last block just pass a null for the end of the range
 591                     long? end = null;
 592                     if (i < upHashes.Length - 1 )
 593                         end= ((i + 1)*serverHash.BlockSize) ;
 594
 595                     //Download the missing block
 596                     var block = await client.GetBlock(cloudFile.Account, cloudFile.Container, relativeUrl, start, end);
 597
 598                     //and store it
 599                     blockUpdater.StoreBlock(i, block);
 600
 601
 602                     Log.InfoFormat("[BLOCK GET] FINISH {0} of {1} for {2}", i, upHashes.Length, localPath);
 603                 }
 604             }
 605
 606             //Want to avoid notifications if no changes were made
 607             var hasChanges = blockUpdater.HasBlocks;
 608             blockUpdater.Commit();
 609
 610             if (hasChanges)
 611                 //Notify listeners that a local file has changed
 612                 StatusNotification.NotifyChangedFile(localPath);
 613
 614             Log.InfoFormat("[BLOCK GET] COMPLETE {0}", localPath);
 615         }
 616
 617
 618         private async Task UploadCloudFile(CloudAction action)
 619         {
 620             if (action == null)
 621                 throw new ArgumentNullException("action");
 622             Contract.EndContractBlock();
 623
 624             try
 625             {
 626                 var accountInfo = action.AccountInfo;
 627
 628                 var fileInfo = action.LocalFile;
 629
 630                 if (fileInfo.Extension.Equals("ignore", StringComparison.InvariantCultureIgnoreCase))
 631                     return;
 632
 633                 var relativePath = fileInfo.AsRelativeTo(accountInfo.AccountPath);
 634                 if (relativePath.StartsWith(FolderConstants.OthersFolder))
 635                 {
 636                     var parts = relativePath.Split('\\');
 637                     var accountName = parts[1];
 638                     var oldName = accountInfo.UserName;
 639                     var absoluteUri = accountInfo.StorageUri.AbsoluteUri;
 640                     var nameIndex = absoluteUri.IndexOf(oldName);
 641                     var root = absoluteUri.Substring(0, nameIndex);
 642
 643                     accountInfo = new AccountInfo
 644                     {
 645                         UserName = accountName,
 646                         AccountPath = Path.Combine(accountInfo.AccountPath, parts[0], parts[1]),
 647                         StorageUri = new Uri(root + accountName),
 648                         BlockHash = accountInfo.BlockHash,
 649                         BlockSize = accountInfo.BlockSize,
 650                         Token = accountInfo.Token
 651                     };
 652                 }
 653
 654
 655                 var fullFileName = fileInfo.GetProperCapitalization();
 656                 using (var gate = NetworkGate.Acquire(fullFileName, NetworkOperation.Uploading))
 657                 {
 658                     //Abort if the file is already being uploaded or downloaded
 659                     if (gate.Failed)
 660                         return;
 661
 662                     var cloudFile = action.CloudFile;
 663                     var account = cloudFile.Account ?? accountInfo.UserName;
 664
 665                     var client = new CloudFilesClient(accountInfo);
 666                     //Even if GetObjectInfo times out, we can proceed with the upload
 667                     var info = client.GetObjectInfo(account, cloudFile.Container, cloudFile.Name);
 668
 669                     //If this is a read-only file, do not upload changes
 670                     if (info.AllowedTo == "read")
 671                         return;
 672
 673                     //TODO: Check how a directory hash is calculated -> All dirs seem to have the same hash
 674                     if (fileInfo is DirectoryInfo)
 675                     {
 676                         //If the directory doesn't exist the Hash property will be empty
 677                         if (String.IsNullOrWhiteSpace(info.Hash))
 678                             //Go on and create the directory
 679                             await client.PutObject(account, cloudFile.Container, cloudFile.Name, fullFileName, String.Empty, "application/directory");
 680                     }
 681                     else
 682                     {
 683
 684                         var cloudHash = info.Hash.ToLower();
 685
 686                         var hash = action.LocalHash.Value;
 687                         var topHash = action.TopHash.Value;
 688
 689                         //If the file hashes match, abort the upload
 690                         if (hash == cloudHash || topHash == cloudHash)
 691                         {
 692                             //but store any metadata changes
 693                             StatusKeeper.StoreInfo(fullFileName, info);
 694                             Log.InfoFormat("Skip upload of {0}, hashes match", fullFileName);
 695                             return;
 696                         }
 697
 698
 699                         //Mark the file as modified while we upload it
 700                         StatusKeeper.SetFileOverlayStatus(fullFileName, FileOverlayStatus.Modified);
 701                         //And then upload it
 702
 703                         //Upload even small files using the Hashmap. The server may already contain
 704                         //the relevant block
 705
 706                         //First, calculate the tree hash
 707                         var treeHash = await Signature.CalculateTreeHashAsync(fullFileName, accountInfo.BlockSize,
 708                                                                               accountInfo.BlockHash, 2);
 709
 710                         await UploadWithHashMap(accountInfo, cloudFile, fileInfo as FileInfo, cloudFile.Name, treeHash);
 711                     }
 712                     //If everything succeeds, change the file and overlay status to normal
 713                     StatusKeeper.SetFileState(fullFileName, FileStatus.Unchanged, FileOverlayStatus.Normal);
 714                 }
 715                 //Notify the Shell to update the overlays
 716                 NativeMethods.RaiseChangeNotification(fullFileName);
 717                 StatusNotification.NotifyChangedFile(fullFileName);
 718             }
 719             catch (AggregateException ex)
 720             {
 721                 var exc = ex.InnerException as WebException;
 722                 if (exc == null)
 723                     throw ex.InnerException;
 724                 if (HandleUploadWebException(action, exc))
 725                     return;
 726                 throw;
 727             }
 728             catch (WebException ex)
 729             {
 730                 if (HandleUploadWebException(action, ex))
 731                     return;
 732                 throw;
 733             }
 734             catch (Exception ex)
 735             {
 736                 Log.Error("Unexpected error while uploading file", ex);
 737                 throw;
 738             }
 739
 740         }
 741
 742
 743
 744         private bool HandleUploadWebException(CloudAction action, WebException exc)
 745         {
 746             var response = exc.Response as HttpWebResponse;
 747             if (response == null)
 748                 throw exc;
 749             if (response.StatusCode == HttpStatusCode.Unauthorized)
 750             {
 751                 Log.Error("Not allowed to upload file", exc);
 752                 var message = String.Format("Not allowed to uplad file {0}", action.LocalFile.FullName);
 753                 StatusKeeper.SetFileState(action.LocalFile.FullName, FileStatus.Unchanged, FileOverlayStatus.Normal);
 754                 StatusNotification.NotifyChange(message, TraceLevel.Warning);
 755                 return true;
 756             }
 757             return false;
 758         }
 759
 760         public async Task UploadWithHashMap(AccountInfo accountInfo,ObjectInfo cloudFile,FileInfo fileInfo,string url,TreeHash treeHash)
 761         {
 762             if (accountInfo == null)
 763                 throw new ArgumentNullException("accountInfo");
 764             if (cloudFile==null)
 765                 throw new ArgumentNullException("cloudFile");
 766             if (fileInfo == null)
 767                 throw new ArgumentNullException("fileInfo");
 768             if (String.IsNullOrWhiteSpace(url))
 769                 throw new ArgumentNullException(url);
 770             if (treeHash==null)
 771                 throw new ArgumentNullException("treeHash");
 772             if (String.IsNullOrWhiteSpace(cloudFile.Container) )
 773                 throw new ArgumentException("Invalid container","cloudFile");
 774             Contract.EndContractBlock();
 775
 776             var fullFileName = fileInfo.GetProperCapitalization();
 777
 778             var account = cloudFile.Account ?? accountInfo.UserName;
 779             var container = cloudFile.Container ;
 780
 781             var client = new CloudFilesClient(accountInfo);
 782             //Send the hashmap to the server
 783             var missingHashes =  await client.PutHashMap(account, container, url, treeHash);
 784             //If the server returns no missing hashes, we are done
 785             while (missingHashes.Count > 0)
 786             {
 787
 788                 var buffer = new byte[accountInfo.BlockSize];
 789                 foreach (var missingHash in missingHashes)
 790                 {
 791                     //Find the proper block
 792                     var blockIndex = treeHash.HashDictionary[missingHash];
 793                     var offset = blockIndex*accountInfo.BlockSize;
 794
 795                     var read = fileInfo.Read(buffer, offset, accountInfo.BlockSize);
 796
 797                     try
 798                     {
 799                         //And upload the block
 800                         await client.PostBlock(account, container, buffer, 0, read);
 801                         Log.InfoFormat("[BLOCK] Block {0} of {1} uploaded", blockIndex, fullFileName);
 802                     }
 803                     catch (Exception exc)
 804                     {
 805                         Log.ErrorFormat("[ERROR] uploading block {0} of {1}\n{2}", blockIndex, fullFileName, exc);
 806                     }
 807
 808                 }
 809
 810                 //Repeat until there are no more missing hashes
 811                 missingHashes = await client.PutHashMap(account, container, url, treeHash);
 812             }
 813         }
 814
 815
 816         public void AddAccount(AccountInfo accountInfo)
 817         {
 818             if (!_accounts.Contains(accountInfo))
 819                 _accounts.Add(accountInfo);
 820         }
 821     }
 822
 823
 824
 825
 826 }