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 using System;
  44 using System.Collections.Generic;
  45 using System.ComponentModel.Composition;
  46 using System.Diagnostics;
  47 using System.Diagnostics.Contracts;
  48 using System.IO;
  49 using System.Net;
  50 using System.Reflection;
  51 using System.Threading;
  52 using System.Threading.Tasks;
  53 using Castle.ActiveRecord;
  54 using Pithos.Interfaces;
  55 using Pithos.Network;
  56 using log4net;
  57
  58 namespace Pithos.Core.Agents
  59 {
  60     [Export]
  61     public class NetworkAgent
  62     {
  63         private static readonly ILog Log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
  64
  65         private Agent<CloudAction> _agent;
  66
  67         [System.ComponentModel.Composition.Import]
  68         private DeleteAgent _deleteAgent=new DeleteAgent();
  69
  70         [System.ComponentModel.Composition.Import]
  71         public IStatusKeeper StatusKeeper { get; set; }
  72
  73         public IStatusNotification StatusNotification { get; set; }
  74
  75
  76         [System.ComponentModel.Composition.Import]
  77         public IPithosSettings Settings { get; set; }
  78
  79         //The Proceed signals the poll agent that it can proceed with polling.
  80         //Essentially it stops the poll agent to give priority to the network agent
  81         //Initially the event is signalled because we don't need to pause
  82         private readonly AsyncManualResetEvent _proceedEvent = new AsyncManualResetEvent(true);
  83
  84         public AsyncManualResetEvent ProceedEvent
  85         {
  86             get { return _proceedEvent; }
  87         }
  88
  89
  90         public void Start()
  91         {
  92             _agent = Agent<CloudAction>.Start(inbox =>
  93             {
  94                 Action loop = null;
  95                 loop = () =>
  96                 {
  97                     _deleteAgent.ProceedEvent.Wait();
  98                     var message = inbox.Receive();
  99                     var process=message.Then(Process,inbox.CancellationToken);
 100                     inbox.LoopAsync(process, loop);
 101                 };
 102                 loop();
 103             });
 104
 105         }
 106
 107         private async Task Process(CloudAction action)
 108         {
 109             if (action == null)
 110                 throw new ArgumentNullException("action");
 111             if (action.AccountInfo==null)
 112                 throw new ArgumentException("The action.AccountInfo is empty","action");
 113             Contract.EndContractBlock();
 114
 115
 116
 117
 118             using (log4net.ThreadContext.Stacks["NETWORK"].Push("PROCESS"))
 119             {
 120                 Log.InfoFormat("[ACTION] Start Processing {0}", action);
 121
 122                 var cloudFile = action.CloudFile;
 123                 var downloadPath = action.GetDownloadPath();
 124
 125                 try
 126                 {
 127                     _proceedEvent.Reset();
 128                     UpdateStatus(PithosStatus.Syncing);
 129                     var accountInfo = action.AccountInfo;
 130
 131                     if (action.Action == CloudActionType.DeleteCloud)
 132                     {
 133                         //Redirect deletes to the delete agent
 134                         _deleteAgent.Post((CloudDeleteAction)action);
 135                     }
 136                     if (_deleteAgent.IsDeletedFile(action))
 137                     {
 138                         //Clear the status of already deleted files to avoid reprocessing
 139                         if (action.LocalFile != null)
 140                             StatusKeeper.ClearFileStatus(action.LocalFile.FullName);
 141                     }
 142                     else
 143                     {
 144                         switch (action.Action)
 145                         {
 146                             case CloudActionType.UploadUnconditional:
 147                                 //Abort if the file was deleted before we reached this point
 148                                 await UploadCloudFile(action);
 149                                 break;
 150                             case CloudActionType.DownloadUnconditional:
 151                                 await DownloadCloudFile(accountInfo, cloudFile, downloadPath);
 152                                 break;
 153                             case CloudActionType.RenameCloud:
 154                                 var moveAction = (CloudMoveAction)action;
 155                                 RenameCloudFile(accountInfo, moveAction);
 156                                 break;
 157                             case CloudActionType.RenameLocal:
 158                                 RenameLocalFile(accountInfo, action);
 159                                 break;
 160                             case CloudActionType.MustSynch:
 161                                 if (!File.Exists(downloadPath) && !Directory.Exists(downloadPath))
 162                                 {
 163                                     await DownloadCloudFile(accountInfo, cloudFile, downloadPath);
 164                                 }
 165                                 else
 166                                 {
 167                                     await SyncFiles(accountInfo, action);
 168                                 }
 169                                 break;
 170                         }
 171                     }
 172                     Log.InfoFormat("[ACTION] End Processing {0}:{1}->{2}", action.Action, action.LocalFile,
 173                                            action.CloudFile.Name);
 174                 }
 175                 catch (WebException exc)
 176                 {
 177                     Log.ErrorFormat("[WEB ERROR] {0} : {1} -> {2} due to exception\r\n{3}", action.Action, action.LocalFile, action.CloudFile, exc);
 178                 }
 179                 catch (OperationCanceledException)
 180                 {
 181                     throw;
 182                 }
 183                 catch (DirectoryNotFoundException)
 184                 {
 185                     Log.ErrorFormat("{0} : {1} -> {2}  failed because the directory was not found.\n Rescheduling a delete",
 186                         action.Action, action.LocalFile, action.CloudFile);
 187                     //Post a delete action for the missing file
 188                     Post(new CloudDeleteAction(action));
 189                 }
 190                 catch (FileNotFoundException)
 191                 {
 192                     Log.ErrorFormat("{0} : {1} -> {2}  failed because the file was not found.\n Rescheduling a delete",
 193                         action.Action, action.LocalFile, action.CloudFile);
 194                     //Post a delete action for the missing file
 195                     Post(new CloudDeleteAction(action));
 196                 }
 197                 catch (Exception exc)
 198                 {
 199                     Log.ErrorFormat("[REQUEUE] {0} : {1} -> {2} due to exception\r\n{3}",
 200                                      action.Action, action.LocalFile, action.CloudFile, exc);
 201
 202                     _agent.Post(action);
 203                 }
 204                 finally
 205                 {
 206                     if (_agent.IsEmpty)
 207                         _proceedEvent.Set();
 208                     UpdateStatus(PithosStatus.InSynch);
 209                 }
 210             }
 211         }
 212
 213
 214         private void UpdateStatus(PithosStatus status)
 215         {
 216             StatusKeeper.SetPithosStatus(status);
 217             StatusNotification.Notify(new Notification());
 218         }
 219
 220         private void RenameLocalFile(AccountInfo accountInfo, CloudAction action)
 221         {
 222             if (accountInfo == null)
 223                 throw new ArgumentNullException("accountInfo");
 224             if (action == null)
 225                 throw new ArgumentNullException("action");
 226             if (action.LocalFile == null)
 227                 throw new ArgumentException("The action's local file is not specified", "action");
 228             if (!Path.IsPathRooted(action.LocalFile.FullName))
 229                 throw new ArgumentException("The action's local file path must be absolute", "action");
 230             if (action.CloudFile == null)
 231                 throw new ArgumentException("The action's cloud file is not specified", "action");
 232             Contract.EndContractBlock();
 233
 234             //We assume that the local file already exists, otherwise the poll agent
 235             //would have issued a download request
 236
 237             var currentInfo = action.CloudFile;
 238             var previousInfo = action.CloudFile.Previous;
 239             var fileAgent = FileAgent.GetFileAgent(accountInfo);
 240
 241             var previousRelativepath = previousInfo.RelativeUrlToFilePath(accountInfo.UserName);
 242             var previousFile = fileAgent.GetFileSystemInfo(previousRelativepath);
 243
 244             //In every case we need to move the local file first
 245             MoveLocalFile(accountInfo, previousFile, fileAgent, currentInfo);
 246
 247         }
 248
 249         private void MoveLocalFile(AccountInfo accountInfo, FileSystemInfo previousFile, FileAgent fileAgent,
 250                                    ObjectInfo currentInfo)
 251         {
 252             var currentRelativepath = currentInfo.RelativeUrlToFilePath(accountInfo.UserName);
 253             var newPath = Path.Combine(fileAgent.RootPath, currentRelativepath);
 254
 255             var isFile= (previousFile is FileInfo);
 256             var previousFullPath = isFile?
 257                 FileInfoExtensions.GetProperFilePathCapitalization(previousFile.FullName):
 258                 FileInfoExtensions.GetProperDirectoryCapitalization(previousFile.FullName);
 259
 260             using (var gateOld = NetworkGate.Acquire(previousFullPath, NetworkOperation.Renaming))
 261             using (var gateNew = NetworkGate.Acquire(newPath,NetworkOperation.Renaming))
 262             using (new SessionScope(FlushAction.Auto))
 263             {
 264                 if (isFile)
 265                     (previousFile as FileInfo).MoveTo(newPath);
 266                 else
 267                 {
 268                     (previousFile as DirectoryInfo).MoveTo(newPath);
 269                 }
 270                 var state = StatusKeeper.GetStateByFilePath(previousFullPath);
 271                 state.FilePath = newPath;
 272                 state.SaveCopy();
 273                 StatusKeeper.SetFileState(previousFullPath,FileStatus.Deleted,FileOverlayStatus.Deleted);
 274             }
 275         }
 276
 277         private async Task SyncFiles(AccountInfo accountInfo,CloudAction action)
 278         {
 279             if (accountInfo == null)
 280                 throw new ArgumentNullException("accountInfo");
 281             if (action==null)
 282                 throw new ArgumentNullException("action");
 283             if (action.LocalFile==null)
 284                 throw new ArgumentException("The action's local file is not specified","action");
 285             if (!Path.IsPathRooted(action.LocalFile.FullName))
 286                 throw new ArgumentException("The action's local file path must be absolute","action");
 287             if (action.CloudFile== null)
 288                 throw new ArgumentException("The action's cloud file is not specified", "action");
 289             Contract.EndContractBlock();
 290
 291             var localFile = action.LocalFile;
 292             var cloudFile = action.CloudFile;
 293             var downloadPath=action.LocalFile.GetProperCapitalization();
 294
 295             var cloudHash = cloudFile.Hash.ToLower();
 296             var previousCloudHash = cloudFile.PreviousHash.ToLower();
 297             var localHash = action.LocalHash.Value.ToLower();
 298             var topHash = action.TopHash.Value.ToLower();
 299
 300             //At this point we know that an object has changed on the server and that a local
 301             //file already exists. We need to decide whether the file has only changed on
 302             //the server or there is a conflicting change on the client.
 303             //
 304
 305             //Not enough to compare only the local hashes (MD5), also have to compare the tophashes
 306             //If any of the hashes match, we are done
 307             if ((cloudHash == localHash || cloudHash == topHash))
 308             {
 309                 Log.InfoFormat("Skipping {0}, hashes match",downloadPath);
 310                 return;
 311             }
 312
 313             //The hashes DON'T match. We need to sync
 314
 315             // If the previous tophash matches the local tophash, the file was only changed on the server.
 316             if (localHash == previousCloudHash)
 317             {
 318                 await DownloadCloudFile(accountInfo, cloudFile, downloadPath);
 319             }
 320             else
 321             {
 322                 //If the previous and local hash don't match, there was a local conflict
 323                 //that was not uploaded to the server. We have a conflict
 324                 ReportConflict(downloadPath);
 325             }
 326         }
 327
 328         private void ReportConflict(string downloadPath)
 329         {
 330             if (String.IsNullOrWhiteSpace(downloadPath))
 331                 throw new ArgumentNullException("downloadPath");
 332             Contract.EndContractBlock();
 333
 334             StatusKeeper.SetFileOverlayStatus(downloadPath, FileOverlayStatus.Conflict);
 335             UpdateStatus(PithosStatus.HasConflicts);
 336             var message = String.Format("Conflict detected for file {0}", downloadPath);
 337             Log.Warn(message);
 338             StatusNotification.NotifyChange(message, TraceLevel.Warning);
 339         }
 340
 341         public void Post(CloudAction cloudAction)
 342         {
 343             if (cloudAction == null)
 344                 throw new ArgumentNullException("cloudAction");
 345             if (cloudAction.AccountInfo==null)
 346                 throw new ArgumentException("The CloudAction.AccountInfo is empty","cloudAction");
 347             Contract.EndContractBlock();
 348
 349             _deleteAgent.ProceedEvent.Wait();
 350
 351             //If the action targets a local file, add a treehash calculation
 352             if (!(cloudAction is CloudDeleteAction) && cloudAction.LocalFile as FileInfo != null)
 353             {
 354                 var accountInfo = cloudAction.AccountInfo;
 355                 var localFile = (FileInfo) cloudAction.LocalFile;
 356                 if (localFile.Length > accountInfo.BlockSize)
 357                     cloudAction.TopHash =
 358                         new Lazy<string>(() => Signature.CalculateTreeHashAsync(localFile,
 359                                                                                 accountInfo.BlockSize,
 360                                                                                 accountInfo.BlockHash, Settings.HashingParallelism).Result
 361                                                     .TopHash.ToHashString());
 362                 else
 363                 {
 364                     cloudAction.TopHash = new Lazy<string>(() => cloudAction.LocalHash.Value);
 365                 }
 366             }
 367             else
 368             {
 369                 //The hash for a directory is the empty string
 370                 cloudAction.TopHash = new Lazy<string>(() => String.Empty);
 371             }
 372
 373             if (cloudAction is CloudDeleteAction)
 374                 _deleteAgent.Post((CloudDeleteAction)cloudAction);
 375             else
 376                 _agent.Post(cloudAction);
 377         }
 378
 379
 380         public IEnumerable<CloudAction> GetEnumerable()
 381         {
 382             return _agent.GetEnumerable();
 383         }
 384
 385         public Task GetDeleteAwaiter()
 386         {
 387             return _deleteAgent.ProceedEvent.WaitAsync();
 388         }
 389         public CancellationToken CancellationToken
 390         {
 391             get { return _agent.CancellationToken; }
 392         }
 393
 394         private static FileAgent GetFileAgent(AccountInfo accountInfo)
 395         {
 396             return AgentLocator<FileAgent>.Get(accountInfo.AccountPath);
 397         }
 398
 399
 400
 401         private void RenameCloudFile(AccountInfo accountInfo,CloudMoveAction action)
 402         {
 403             if (accountInfo==null)
 404                 throw new ArgumentNullException("accountInfo");
 405             if (action==null)
 406                 throw new ArgumentNullException("action");
 407             if (action.CloudFile==null)
 408                 throw new ArgumentException("CloudFile","action");
 409             if (action.LocalFile==null)
 410                 throw new ArgumentException("LocalFile","action");
 411             if (action.OldLocalFile==null)
 412                 throw new ArgumentException("OldLocalFile","action");
 413             if (action.OldCloudFile==null)
 414                 throw new ArgumentException("OldCloudFile","action");
 415             Contract.EndContractBlock();
 416
 417
 418             var newFilePath = action.LocalFile.FullName;
 419
 420             //How do we handle concurrent renames and deletes/uploads/downloads?
 421             //* A conflicting upload means that a file was renamed before it had a chance to finish uploading
 422             //  This should never happen as the network agent executes only one action at a time
 423             //* A conflicting download means that the file was modified on the cloud. While we can go on and complete
 424             //  the rename, there may be a problem if the file is downloaded in blocks, as subsequent block requests for the
 425             //  same name will fail.
 426             //  This should never happen as the network agent executes only one action at a time.
 427             //* A conflicting delete can happen if the rename was followed by a delete action that didn't have the chance
 428             //  to remove the rename from the queue.
 429             //  We can probably ignore this case. It will result in an error which should be ignored
 430
 431
 432             //The local file is already renamed
 433             StatusKeeper.SetFileOverlayStatus(newFilePath, FileOverlayStatus.Modified);
 434
 435
 436             var account = action.CloudFile.Account ?? accountInfo.UserName;
 437             var container = action.CloudFile.Container;
 438
 439             var client = new CloudFilesClient(accountInfo);
 440             //TODO: What code is returned when the source file doesn't exist?
 441             client.MoveObject(account, container, action.OldCloudFile.Name, container, action.CloudFile.Name);
 442
 443             StatusKeeper.SetFileStatus(newFilePath, FileStatus.Unchanged);
 444             StatusKeeper.SetFileOverlayStatus(newFilePath, FileOverlayStatus.Normal);
 445             NativeMethods.RaiseChangeNotification(newFilePath);
 446         }
 447
 448         //Download a file.
 449         private async Task DownloadCloudFile(AccountInfo accountInfo, ObjectInfo cloudFile , string filePath)
 450         {
 451             if (accountInfo == null)
 452                 throw new ArgumentNullException("accountInfo");
 453             if (cloudFile == null)
 454                 throw new ArgumentNullException("cloudFile");
 455             if (String.IsNullOrWhiteSpace(cloudFile.Account))
 456                 throw new ArgumentNullException("cloudFile");
 457             if (String.IsNullOrWhiteSpace(cloudFile.Container))
 458                 throw new ArgumentNullException("cloudFile");
 459             if (String.IsNullOrWhiteSpace(filePath))
 460                 throw new ArgumentNullException("filePath");
 461             if (!Path.IsPathRooted(filePath))
 462                 throw new ArgumentException("The filePath must be rooted", "filePath");
 463             Contract.EndContractBlock();
 464
 465
 466             var localPath = Interfaces.FileInfoExtensions.GetProperFilePathCapitalization(filePath);
 467             var relativeUrl = new Uri(cloudFile.Name, UriKind.Relative);
 468
 469             var url = relativeUrl.ToString();
 470             if (cloudFile.Name.EndsWith(".ignore", StringComparison.InvariantCultureIgnoreCase))
 471                 return;
 472
 473
 474             //Are we already downloading or uploading the file?
 475             using (var gate=NetworkGate.Acquire(localPath, NetworkOperation.Downloading))
 476             {
 477                 if (gate.Failed)
 478                     return;
 479
 480                 var client = new CloudFilesClient(accountInfo);
 481                 var account = cloudFile.Account;
 482                 var container = cloudFile.Container;
 483
 484                 if (cloudFile.Content_Type == @"application/directory")
 485                 {
 486                     if (!Directory.Exists(localPath))
 487                         Directory.CreateDirectory(localPath);
 488                 }
 489                 else
 490                 {
 491                     //Retrieve the hashmap from the server
 492                     var serverHash = await client.GetHashMap(account, container, url);
 493                     //If it's a small file
 494                     if (serverHash.Hashes.Count == 1)
 495                         //Download it in one go
 496                         await
 497                             DownloadEntireFileAsync(accountInfo, client, cloudFile, relativeUrl, localPath, serverHash);
 498                         //Otherwise download it block by block
 499                     else
 500                         await DownloadWithBlocks(accountInfo, client, cloudFile, relativeUrl, localPath, serverHash);
 501
 502                     if (cloudFile.AllowedTo == "read")
 503                     {
 504                         var attributes = File.GetAttributes(localPath);
 505                         File.SetAttributes(localPath, attributes | FileAttributes.ReadOnly);
 506                     }
 507                 }
 508
 509                 //Now we can store the object's metadata without worrying about ghost status entries
 510                 StatusKeeper.StoreInfo(localPath, cloudFile);
 511
 512             }
 513         }
 514
 515         //Download a small file with a single GET operation
 516         private async Task DownloadEntireFileAsync(AccountInfo accountInfo, CloudFilesClient client, ObjectInfo cloudFile, Uri relativeUrl, string filePath,TreeHash serverHash)
 517         {
 518             if (client == null)
 519                 throw new ArgumentNullException("client");
 520             if (cloudFile==null)
 521                 throw new ArgumentNullException("cloudFile");
 522             if (relativeUrl == null)
 523                 throw new ArgumentNullException("relativeUrl");
 524             if (String.IsNullOrWhiteSpace(filePath))
 525                 throw new ArgumentNullException("filePath");
 526             if (!Path.IsPathRooted(filePath))
 527                 throw new ArgumentException("The localPath must be rooted", "filePath");
 528             Contract.EndContractBlock();
 529
 530             var localPath = Pithos.Interfaces.FileInfoExtensions.GetProperFilePathCapitalization(filePath);
 531             //If the file already exists
 532             if (File.Exists(localPath))
 533             {
 534                 //First check with MD5 as this is a small file
 535                 var localMD5 = Signature.CalculateMD5(localPath);
 536                 var cloudHash=serverHash.TopHash.ToHashString();
 537                 if (localMD5==cloudHash)
 538                     return;
 539                 //Then check with a treehash
 540                 var localTreeHash = Signature.CalculateTreeHash(localPath, serverHash.BlockSize, serverHash.BlockHash);
 541                 var localHash = localTreeHash.TopHash.ToHashString();
 542                 if (localHash==cloudHash)
 543                     return;
 544             }
 545             StatusNotification.Notify(new CloudNotification { Data = cloudFile });
 546
 547             var fileAgent = GetFileAgent(accountInfo);
 548             //Calculate the relative file path for the new file
 549             var relativePath = relativeUrl.RelativeUriToFilePath();
 550             //The file will be stored in a temporary location while downloading with an extension .download
 551             var tempPath = Path.Combine(fileAgent.CachePath, relativePath + ".download");
 552             //Make sure the target folder exists. DownloadFileTask will not create the folder
 553             var tempFolder = Path.GetDirectoryName(tempPath);
 554             if (!Directory.Exists(tempFolder))
 555                 Directory.CreateDirectory(tempFolder);
 556
 557             //Download the object to the temporary location
 558             await client.GetObject(cloudFile.Account, cloudFile.Container, relativeUrl.ToString(), tempPath);
 559
 560             //Create the local folder if it doesn't exist (necessary for shared objects)
 561             var localFolder = Path.GetDirectoryName(localPath);
 562             if (!Directory.Exists(localFolder))
 563                 Directory.CreateDirectory(localFolder);
 564             //And move it to its actual location once downloading is finished
 565             if (File.Exists(localPath))
 566                 File.Replace(tempPath,localPath,null,true);
 567             else
 568                 File.Move(tempPath,localPath);
 569             //Notify listeners that a local file has changed
 570             StatusNotification.NotifyChangedFile(localPath);
 571
 572
 573         }
 574
 575         //Download a file asynchronously using blocks
 576         public async Task DownloadWithBlocks(AccountInfo accountInfo, CloudFilesClient client, ObjectInfo cloudFile, Uri relativeUrl, string filePath, TreeHash serverHash)
 577         {
 578             if (client == null)
 579                 throw new ArgumentNullException("client");
 580             if (cloudFile == null)
 581                 throw new ArgumentNullException("cloudFile");
 582             if (relativeUrl == null)
 583                 throw new ArgumentNullException("relativeUrl");
 584             if (String.IsNullOrWhiteSpace(filePath))
 585                 throw new ArgumentNullException("filePath");
 586             if (!Path.IsPathRooted(filePath))
 587                 throw new ArgumentException("The filePath must be rooted", "filePath");
 588             if (serverHash == null)
 589                 throw new ArgumentNullException("serverHash");
 590             Contract.EndContractBlock();
 591
 592            var fileAgent = GetFileAgent(accountInfo);
 593             var localPath = Interfaces.FileInfoExtensions.GetProperFilePathCapitalization(filePath);
 594
 595             //Calculate the relative file path for the new file
 596             var relativePath = relativeUrl.RelativeUriToFilePath();
 597             var blockUpdater = new BlockUpdater(fileAgent.CachePath, localPath, relativePath, serverHash);
 598
 599
 600
 601             //Calculate the file's treehash
 602             var treeHash = await Signature.CalculateTreeHashAsync(localPath, serverHash.BlockSize, serverHash.BlockHash, 2);
 603
 604             //And compare it with the server's hash
 605             var upHashes = serverHash.GetHashesAsStrings();
 606             var localHashes = treeHash.HashDictionary;
 607             for (int i = 0; i < upHashes.Length; i++)
 608             {
 609                 //For every non-matching hash
 610                 var upHash = upHashes[i];
 611                 if (!localHashes.ContainsKey(upHash))
 612                 {
 613                     StatusNotification.Notify(new CloudNotification { Data = cloudFile });
 614
 615                     if (blockUpdater.UseOrphan(i, upHash))
 616                     {
 617                         Log.InfoFormat("[BLOCK GET] ORPHAN FOUND for {0} of {1} for {2}", i, upHashes.Length, localPath);
 618                         continue;
 619                     }
 620                     Log.InfoFormat("[BLOCK GET] START {0} of {1} for {2}", i, upHashes.Length, localPath);
 621                     var start = i*serverHash.BlockSize;
 622                     //To download the last block just pass a null for the end of the range
 623                     long? end = null;
 624                     if (i < upHashes.Length - 1 )
 625                         end= ((i + 1)*serverHash.BlockSize) ;
 626
 627                     //Download the missing block
 628                     var block = await client.GetBlock(cloudFile.Account, cloudFile.Container, relativeUrl, start, end);
 629
 630                     //and store it
 631                     blockUpdater.StoreBlock(i, block);
 632
 633
 634                     Log.InfoFormat("[BLOCK GET] FINISH {0} of {1} for {2}", i, upHashes.Length, localPath);
 635                 }
 636             }
 637
 638             //Want to avoid notifications if no changes were made
 639             var hasChanges = blockUpdater.HasBlocks;
 640             blockUpdater.Commit();
 641
 642             if (hasChanges)
 643                 //Notify listeners that a local file has changed
 644                 StatusNotification.NotifyChangedFile(localPath);
 645
 646             Log.InfoFormat("[BLOCK GET] COMPLETE {0}", localPath);
 647         }
 648
 649
 650         private async Task UploadCloudFile(CloudAction action)
 651         {
 652             if (action == null)
 653                 throw new ArgumentNullException("action");
 654             Contract.EndContractBlock();
 655
 656             try
 657             {
 658                 var accountInfo = action.AccountInfo;
 659
 660                 var fileInfo = action.LocalFile;
 661
 662                 if (fileInfo.Extension.Equals("ignore", StringComparison.InvariantCultureIgnoreCase))
 663                     return;
 664
 665                 var relativePath = fileInfo.AsRelativeTo(accountInfo.AccountPath);
 666                 if (relativePath.StartsWith(FolderConstants.OthersFolder))
 667                 {
 668                     var parts = relativePath.Split('\\');
 669                     var accountName = parts[1];
 670                     var oldName = accountInfo.UserName;
 671                     var absoluteUri = accountInfo.StorageUri.AbsoluteUri;
 672                     var nameIndex = absoluteUri.IndexOf(oldName, StringComparison.Ordinal);
 673                     var root = absoluteUri.Substring(0, nameIndex);
 674
 675                     accountInfo = new AccountInfo
 676                     {
 677                         UserName = accountName,
 678                         AccountPath = Path.Combine(accountInfo.AccountPath, parts[0], parts[1]),
 679                         StorageUri = new Uri(root + accountName),
 680                         BlockHash = accountInfo.BlockHash,
 681                         BlockSize = accountInfo.BlockSize,
 682                         Token = accountInfo.Token
 683                     };
 684                 }
 685
 686
 687                 var fullFileName = fileInfo.GetProperCapitalization();
 688                 using (var gate = NetworkGate.Acquire(fullFileName, NetworkOperation.Uploading))
 689                 {
 690                     //Abort if the file is already being uploaded or downloaded
 691                     if (gate.Failed)
 692                         return;
 693
 694                     var cloudFile = action.CloudFile;
 695                     var account = cloudFile.Account ?? accountInfo.UserName;
 696
 697                     var client = new CloudFilesClient(accountInfo);
 698                     //Even if GetObjectInfo times out, we can proceed with the upload
 699                     var info = client.GetObjectInfo(account, cloudFile.Container, cloudFile.Name);
 700
 701                     //If this is a read-only file, do not upload changes
 702                     if (info.AllowedTo == "read")
 703                         return;
 704
 705                     //TODO: Check how a directory hash is calculated -> All dirs seem to have the same hash
 706                     if (fileInfo is DirectoryInfo)
 707                     {
 708                         //If the directory doesn't exist the Hash property will be empty
 709                         if (String.IsNullOrWhiteSpace(info.Hash))
 710                             //Go on and create the directory
 711                             await client.PutObject(account, cloudFile.Container, cloudFile.Name, fullFileName, String.Empty, "application/directory");
 712                     }
 713                     else
 714                     {
 715
 716                         var cloudHash = info.Hash.ToLower();
 717
 718                         var hash = action.LocalHash.Value;
 719                         var topHash = action.TopHash.Value;
 720
 721                         //If the file hashes match, abort the upload
 722                         if (hash == cloudHash || topHash == cloudHash)
 723                         {
 724                             //but store any metadata changes
 725                             StatusKeeper.StoreInfo(fullFileName, info);
 726                             Log.InfoFormat("Skip upload of {0}, hashes match", fullFileName);
 727                             return;
 728                         }
 729
 730
 731                         //Mark the file as modified while we upload it
 732                         StatusKeeper.SetFileOverlayStatus(fullFileName, FileOverlayStatus.Modified);
 733                         //And then upload it
 734
 735                         //Upload even small files using the Hashmap. The server may already contain
 736                         //the relevant block
 737
 738                         //First, calculate the tree hash
 739                         var treeHash = await Signature.CalculateTreeHashAsync(fullFileName, accountInfo.BlockSize,
 740                                                                               accountInfo.BlockHash, 2);
 741
 742                         await UploadWithHashMap(accountInfo, cloudFile, fileInfo as FileInfo, cloudFile.Name, treeHash);
 743                     }
 744                     //If everything succeeds, change the file and overlay status to normal
 745                     StatusKeeper.SetFileState(fullFileName, FileStatus.Unchanged, FileOverlayStatus.Normal);
 746                 }
 747                 //Notify the Shell to update the overlays
 748                 NativeMethods.RaiseChangeNotification(fullFileName);
 749                 StatusNotification.NotifyChangedFile(fullFileName);
 750             }
 751             catch (AggregateException ex)
 752             {
 753                 var exc = ex.InnerException as WebException;
 754                 if (exc == null)
 755                     throw ex.InnerException;
 756                 if (HandleUploadWebException(action, exc))
 757                     return;
 758                 throw;
 759             }
 760             catch (WebException ex)
 761             {
 762                 if (HandleUploadWebException(action, ex))
 763                     return;
 764                 throw;
 765             }
 766             catch (Exception ex)
 767             {
 768                 Log.Error("Unexpected error while uploading file", ex);
 769                 throw;
 770             }
 771
 772         }
 773
 774
 775
 776         private bool HandleUploadWebException(CloudAction action, WebException exc)
 777         {
 778             var response = exc.Response as HttpWebResponse;
 779             if (response == null)
 780                 throw exc;
 781             if (response.StatusCode == HttpStatusCode.Unauthorized)
 782             {
 783                 Log.Error("Not allowed to upload file", exc);
 784                 var message = String.Format("Not allowed to uplad file {0}", action.LocalFile.FullName);
 785                 StatusKeeper.SetFileState(action.LocalFile.FullName, FileStatus.Unchanged, FileOverlayStatus.Normal);
 786                 StatusNotification.NotifyChange(message, TraceLevel.Warning);
 787                 return true;
 788             }
 789             return false;
 790         }
 791
 792         public async Task UploadWithHashMap(AccountInfo accountInfo,ObjectInfo cloudFile,FileInfo fileInfo,string url,TreeHash treeHash)
 793         {
 794             if (accountInfo == null)
 795                 throw new ArgumentNullException("accountInfo");
 796             if (cloudFile==null)
 797                 throw new ArgumentNullException("cloudFile");
 798             if (fileInfo == null)
 799                 throw new ArgumentNullException("fileInfo");
 800             if (String.IsNullOrWhiteSpace(url))
 801                 throw new ArgumentNullException(url);
 802             if (treeHash==null)
 803                 throw new ArgumentNullException("treeHash");
 804             if (String.IsNullOrWhiteSpace(cloudFile.Container) )
 805                 throw new ArgumentException("Invalid container","cloudFile");
 806             Contract.EndContractBlock();
 807
 808             var fullFileName = fileInfo.GetProperCapitalization();
 809
 810             var account = cloudFile.Account ?? accountInfo.UserName;
 811             var container = cloudFile.Container ;
 812
 813             var client = new CloudFilesClient(accountInfo);
 814             //Send the hashmap to the server
 815             var missingHashes =  await client.PutHashMap(account, container, url, treeHash);
 816             //If the server returns no missing hashes, we are done
 817             while (missingHashes.Count > 0)
 818             {
 819
 820                 var buffer = new byte[accountInfo.BlockSize];
 821                 foreach (var missingHash in missingHashes)
 822                 {
 823                     //Find the proper block
 824                     var blockIndex = treeHash.HashDictionary[missingHash];
 825                     var offset = blockIndex*accountInfo.BlockSize;
 826
 827                     var read = fileInfo.Read(buffer, offset, accountInfo.BlockSize);
 828
 829                     try
 830                     {
 831                         //And upload the block
 832                         await client.PostBlock(account, container, buffer, 0, read);
 833                         Log.InfoFormat("[BLOCK] Block {0} of {1} uploaded", blockIndex, fullFileName);
 834                     }
 835                     catch (Exception exc)
 836                     {
 837                         Log.ErrorFormat("[ERROR] uploading block {0} of {1}\n{2}", blockIndex, fullFileName, exc);
 838                     }
 839
 840                 }
 841
 842                 //Repeat until there are no more missing hashes
 843                 missingHashes = await client.PutHashMap(account, container, url, treeHash);
 844             }
 845         }
 846
 847
 848     }
 849
 850
 851
 852
 853 }