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