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.RenameLocal:
 165                                 RenameLocalFile(accountInfo, action);
 166                                 break;
 167                             case CloudActionType.MustSynch:
 168                                 if (!File.Exists(downloadPath) && !Directory.Exists(downloadPath))
 169                                 {
 170                                     await DownloadCloudFile(accountInfo, cloudFile, downloadPath);
 171                                 }
 172                                 else
 173                                 {
 174                                     await SyncFiles(accountInfo, action);
 175                                 }
 176                                 break;
 177                         }
 178                     }
 179                     Log.InfoFormat("[ACTION] End Processing {0}:{1}->{2}", action.Action, action.LocalFile,
 180                                            action.CloudFile.Name);
 181                 }
 182                 catch (WebException exc)
 183                 {
 184                     Log.ErrorFormat("[WEB ERROR] {0} : {1} -> {2} due to exception\r\n{3}", action.Action, action.LocalFile, action.CloudFile, exc);
 185                 }
 186                 catch (OperationCanceledException)
 187                 {
 188                     throw;
 189                 }
 190                 catch (DirectoryNotFoundException)
 191                 {
 192                     Log.ErrorFormat("{0} : {1} -> {2}  failed because the directory 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 (FileNotFoundException)
 198                 {
 199                     Log.ErrorFormat("{0} : {1} -> {2}  failed because the file was not found.\n Rescheduling a delete",
 200                         action.Action, action.LocalFile, action.CloudFile);
 201                     //Post a delete action for the missing file
 202                     Post(new CloudDeleteAction(action));
 203                 }
 204                 catch (Exception exc)
 205                 {
 206                     Log.ErrorFormat("[REQUEUE] {0} : {1} -> {2} due to exception\r\n{3}",
 207                                      action.Action, action.LocalFile, action.CloudFile, exc);
 208
 209                     _agent.Post(action);
 210                 }
 211                 finally
 212                 {
 213                     if (_agent.IsEmpty)
 214                         _proceedEvent.Set();
 215                     UpdateStatus(PithosStatus.InSynch);
 216                 }
 217             }
 218         }
 219
 220
 221         private void UpdateStatus(PithosStatus status)
 222         {
 223             StatusKeeper.SetPithosStatus(status);
 224             StatusNotification.Notify(new Notification());
 225         }
 226
 227         private void RenameLocalFile(AccountInfo accountInfo, CloudAction action)
 228         {
 229             if (accountInfo == null)
 230                 throw new ArgumentNullException("accountInfo");
 231             if (action == null)
 232                 throw new ArgumentNullException("action");
 233             if (action.LocalFile == null)
 234                 throw new ArgumentException("The action's local file is not specified", "action");
 235             if (!Path.IsPathRooted(action.LocalFile.FullName))
 236                 throw new ArgumentException("The action's local file path must be absolute", "action");
 237             if (action.CloudFile == null)
 238                 throw new ArgumentException("The action's cloud file is not specified", "action");
 239             Contract.EndContractBlock();
 240
 241             //We assume that the local file already exists, otherwise the poll agent
 242             //would have issued a download request
 243
 244             var currentInfo = action.CloudFile;
 245             var previousInfo = action.CloudFile.Previous;
 246             var fileAgent = FileAgent.GetFileAgent(accountInfo);
 247
 248             var previousRelativepath = previousInfo.RelativeUrlToFilePath(accountInfo.UserName);
 249             var previousFile = fileAgent.GetFileSystemInfo(previousRelativepath);
 250
 251             //In every case we need to move the local file first
 252             MoveLocalFile(accountInfo, previousFile, fileAgent, currentInfo);
 253
 254         }
 255
 256         private void MoveLocalFile(AccountInfo accountInfo, FileSystemInfo previousFile, FileAgent fileAgent,
 257                                    ObjectInfo currentInfo)
 258         {
 259             var currentRelativepath = currentInfo.RelativeUrlToFilePath(accountInfo.UserName);
 260             var newPath = Path.Combine(fileAgent.RootPath, currentRelativepath);
 261
 262             var isFile= (previousFile is FileInfo);
 263             var previousFullPath = isFile?
 264                 FileInfoExtensions.GetProperFilePathCapitalization(previousFile.FullName):
 265                 FileInfoExtensions.GetProperDirectoryCapitalization(previousFile.FullName);
 266
 267             using (var gateOld = NetworkGate.Acquire(previousFullPath, NetworkOperation.Renaming))
 268             using (var gateNew = NetworkGate.Acquire(newPath,NetworkOperation.Renaming))
 269             using (new SessionScope(FlushAction.Auto))
 270             {
 271                 if (isFile)
 272                     (previousFile as FileInfo).MoveTo(newPath);
 273                 else
 274                 {
 275                     (previousFile as DirectoryInfo).MoveTo(newPath);
 276                 }
 277                 var state = StatusKeeper.GetStateByFilePath(previousFullPath);
 278                 state.FilePath = newPath;
 279                 state.SaveCopy();
 280                 StatusKeeper.SetFileState(previousFullPath,FileStatus.Deleted,FileOverlayStatus.Deleted);
 281             }
 282         }
 283
 284         private async Task SyncFiles(AccountInfo accountInfo,CloudAction action)
 285         {
 286             if (accountInfo == null)
 287                 throw new ArgumentNullException("accountInfo");
 288             if (action==null)
 289                 throw new ArgumentNullException("action");
 290             if (action.LocalFile==null)
 291                 throw new ArgumentException("The action's local file is not specified","action");
 292             if (!Path.IsPathRooted(action.LocalFile.FullName))
 293                 throw new ArgumentException("The action's local file path must be absolute","action");
 294             if (action.CloudFile== null)
 295                 throw new ArgumentException("The action's cloud file is not specified", "action");
 296             Contract.EndContractBlock();
 297
 298             var localFile = action.LocalFile;
 299             var cloudFile = action.CloudFile;
 300             var downloadPath=action.LocalFile.GetProperCapitalization();
 301
 302             var cloudHash = cloudFile.Hash.ToLower();
 303             var previousCloudHash = cloudFile.PreviousHash.ToLower();
 304             var localHash = action.LocalHash.Value.ToLower();
 305             var topHash = action.TopHash.Value.ToLower();
 306
 307             //At this point we know that an object has changed on the server and that a local
 308             //file already exists. We need to decide whether the file has only changed on
 309             //the server or there is a conflicting change on the client.
 310             //
 311
 312             //Not enough to compare only the local hashes (MD5), also have to compare the tophashes
 313             //If any of the hashes match, we are done
 314             if ((cloudHash == localHash || cloudHash == topHash))
 315             {
 316                 Log.InfoFormat("Skipping {0}, hashes match",downloadPath);
 317                 return;
 318             }
 319
 320             //The hashes DON'T match. We need to sync
 321
 322             // If the previous tophash matches the local tophash, the file was only changed on the server.
 323             if (localHash == previousCloudHash)
 324             {
 325                 await DownloadCloudFile(accountInfo, cloudFile, downloadPath);
 326             }
 327             else
 328             {
 329                 //If the previous and local hash don't match, there was a local conflict
 330                 //that was not uploaded to the server. We have a conflict
 331                 ReportConflict(downloadPath);
 332             }
 333         }
 334
 335         private void ReportConflict(string downloadPath)
 336         {
 337             if (String.IsNullOrWhiteSpace(downloadPath))
 338                 throw new ArgumentNullException("downloadPath");
 339             Contract.EndContractBlock();
 340
 341             StatusKeeper.SetFileOverlayStatus(downloadPath, FileOverlayStatus.Conflict);
 342             UpdateStatus(PithosStatus.HasConflicts);
 343             var message = String.Format("Conflict detected for file {0}", downloadPath);
 344             Log.Warn(message);
 345             StatusNotification.NotifyChange(message, TraceLevel.Warning);
 346         }
 347
 348         public void Post(CloudAction cloudAction)
 349         {
 350             if (cloudAction == null)
 351                 throw new ArgumentNullException("cloudAction");
 352             if (cloudAction.AccountInfo==null)
 353                 throw new ArgumentException("The CloudAction.AccountInfo is empty","cloudAction");
 354             Contract.EndContractBlock();
 355
 356             _deleteAgent.ProceedEvent.Wait();
 357
 358             //If the action targets a local file, add a treehash calculation
 359             if (!(cloudAction is CloudDeleteAction) && cloudAction.LocalFile as FileInfo != null)
 360             {
 361                 var accountInfo = cloudAction.AccountInfo;
 362                 var localFile = (FileInfo) cloudAction.LocalFile;
 363                 if (localFile.Length > accountInfo.BlockSize)
 364                     cloudAction.TopHash =
 365                         new Lazy<string>(() => Signature.CalculateTreeHashAsync(localFile,
 366                                                                                 accountInfo.BlockSize,
 367                                                                                 accountInfo.BlockHash, Settings.HashingParallelism).Result
 368                                                     .TopHash.ToHashString());
 369                 else
 370                 {
 371                     cloudAction.TopHash = new Lazy<string>(() => cloudAction.LocalHash.Value);
 372                 }
 373             }
 374             else
 375             {
 376                 //The hash for a directory is the empty string
 377                 cloudAction.TopHash = new Lazy<string>(() => String.Empty);
 378             }
 379
 380             if (cloudAction is CloudDeleteAction)
 381                 _deleteAgent.Post((CloudDeleteAction)cloudAction);
 382             else
 383                 _agent.Post(cloudAction);
 384         }
 385
 386
 387         public IEnumerable<CloudAction> GetEnumerable()
 388         {
 389             return _agent.GetEnumerable();
 390         }
 391
 392         public Task GetDeleteAwaiter()
 393         {
 394             return _deleteAgent.ProceedEvent.WaitAsync();
 395         }
 396         public CancellationToken CancellationToken
 397         {
 398             get { return _agent.CancellationToken; }
 399         }
 400
 401         private static FileAgent GetFileAgent(AccountInfo accountInfo)
 402         {
 403             return AgentLocator<FileAgent>.Get(accountInfo.AccountPath);
 404         }
 405
 406
 407
 408         private void RenameCloudFile(AccountInfo accountInfo,CloudMoveAction action)
 409         {
 410             if (accountInfo==null)
 411                 throw new ArgumentNullException("accountInfo");
 412             if (action==null)
 413                 throw new ArgumentNullException("action");
 414             if (action.CloudFile==null)
 415                 throw new ArgumentException("CloudFile","action");
 416             if (action.LocalFile==null)
 417                 throw new ArgumentException("LocalFile","action");
 418             if (action.OldLocalFile==null)
 419                 throw new ArgumentException("OldLocalFile","action");
 420             if (action.OldCloudFile==null)
 421                 throw new ArgumentException("OldCloudFile","action");
 422             Contract.EndContractBlock();
 423
 424
 425             var newFilePath = action.LocalFile.FullName;
 426
 427             //How do we handle concurrent renames and deletes/uploads/downloads?
 428             //* A conflicting upload means that a file was renamed before it had a chance to finish uploading
 429             //  This should never happen as the network agent executes only one action at a time
 430             //* A conflicting download means that the file was modified on the cloud. While we can go on and complete
 431             //  the rename, there may be a problem if the file is downloaded in blocks, as subsequent block requests for the
 432             //  same name will fail.
 433             //  This should never happen as the network agent executes only one action at a time.
 434             //* A conflicting delete can happen if the rename was followed by a delete action that didn't have the chance
 435             //  to remove the rename from the queue.
 436             //  We can probably ignore this case. It will result in an error which should be ignored
 437
 438
 439             //The local file is already renamed
 440             StatusKeeper.SetFileOverlayStatus(newFilePath, FileOverlayStatus.Modified);
 441
 442
 443             var account = action.CloudFile.Account ?? accountInfo.UserName;
 444             var container = action.CloudFile.Container;
 445
 446             var client = new CloudFilesClient(accountInfo);
 447             //TODO: What code is returned when the source file doesn't exist?
 448             client.MoveObject(account, container, action.OldCloudFile.Name, container, action.CloudFile.Name);
 449
 450             StatusKeeper.SetFileStatus(newFilePath, FileStatus.Unchanged);
 451             StatusKeeper.SetFileOverlayStatus(newFilePath, FileOverlayStatus.Normal);
 452             NativeMethods.RaiseChangeNotification(newFilePath);
 453         }
 454
 455         //Download a file.
 456         private async Task DownloadCloudFile(AccountInfo accountInfo, ObjectInfo cloudFile , string filePath)
 457         {
 458             if (accountInfo == null)
 459                 throw new ArgumentNullException("accountInfo");
 460             if (cloudFile == null)
 461                 throw new ArgumentNullException("cloudFile");
 462             if (String.IsNullOrWhiteSpace(cloudFile.Account))
 463                 throw new ArgumentNullException("cloudFile");
 464             if (String.IsNullOrWhiteSpace(cloudFile.Container))
 465                 throw new ArgumentNullException("cloudFile");
 466             if (String.IsNullOrWhiteSpace(filePath))
 467                 throw new ArgumentNullException("filePath");
 468             if (!Path.IsPathRooted(filePath))
 469                 throw new ArgumentException("The filePath must be rooted", "filePath");
 470             Contract.EndContractBlock();
 471
 472
 473             var localPath = Interfaces.FileInfoExtensions.GetProperFilePathCapitalization(filePath);
 474             var relativeUrl = new Uri(cloudFile.Name, UriKind.Relative);
 475
 476             var url = relativeUrl.ToString();
 477             if (cloudFile.Name.EndsWith(".ignore", StringComparison.InvariantCultureIgnoreCase))
 478                 return;
 479
 480
 481             //Are we already downloading or uploading the file?
 482             using (var gate=NetworkGate.Acquire(localPath, NetworkOperation.Downloading))
 483             {
 484                 if (gate.Failed)
 485                     return;
 486
 487                 var client = new CloudFilesClient(accountInfo);
 488                 var account = cloudFile.Account;
 489                 var container = cloudFile.Container;
 490
 491                 if (cloudFile.Content_Type == @"application/directory")
 492                 {
 493                     if (!Directory.Exists(localPath))
 494                         Directory.CreateDirectory(localPath);
 495                 }
 496                 else
 497                 {
 498                     //Retrieve the hashmap from the server
 499                     var serverHash = await client.GetHashMap(account, container, url);
 500                     //If it's a small file
 501                     if (serverHash.Hashes.Count == 1)
 502                         //Download it in one go
 503                         await
 504                             DownloadEntireFileAsync(accountInfo, client, cloudFile, relativeUrl, localPath, serverHash);
 505                         //Otherwise download it block by block
 506                     else
 507                         await DownloadWithBlocks(accountInfo, client, cloudFile, relativeUrl, localPath, serverHash);
 508
 509                     if (cloudFile.AllowedTo == "read")
 510                     {
 511                         var attributes = File.GetAttributes(localPath);
 512                         File.SetAttributes(localPath, attributes | FileAttributes.ReadOnly);
 513                     }
 514                 }
 515
 516                 //Now we can store the object's metadata without worrying about ghost status entries
 517                 StatusKeeper.StoreInfo(localPath, cloudFile);
 518
 519             }
 520         }
 521
 522         //Download a small file with a single GET operation
 523         private async Task DownloadEntireFileAsync(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 localPath must be rooted", "filePath");
 535             Contract.EndContractBlock();
 536
 537             var localPath = Pithos.Interfaces.FileInfoExtensions.GetProperFilePathCapitalization(filePath);
 538             //If the file already exists
 539             if (File.Exists(localPath))
 540             {
 541                 //First check with MD5 as this is a small file
 542                 var localMD5 = Signature.CalculateMD5(localPath);
 543                 var cloudHash=serverHash.TopHash.ToHashString();
 544                 if (localMD5==cloudHash)
 545                     return;
 546                 //Then check with a treehash
 547                 var localTreeHash = Signature.CalculateTreeHash(localPath, serverHash.BlockSize, serverHash.BlockHash);
 548                 var localHash = localTreeHash.TopHash.ToHashString();
 549                 if (localHash==cloudHash)
 550                     return;
 551             }
 552             StatusNotification.Notify(new CloudNotification { Data = cloudFile });
 553
 554             var fileAgent = GetFileAgent(accountInfo);
 555             //Calculate the relative file path for the new file
 556             var relativePath = relativeUrl.RelativeUriToFilePath();
 557             //The file will be stored in a temporary location while downloading with an extension .download
 558             var tempPath = Path.Combine(fileAgent.CachePath, relativePath + ".download");
 559             //Make sure the target folder exists. DownloadFileTask will not create the folder
 560             var tempFolder = Path.GetDirectoryName(tempPath);
 561             if (!Directory.Exists(tempFolder))
 562                 Directory.CreateDirectory(tempFolder);
 563
 564             //Download the object to the temporary location
 565             await client.GetObject(cloudFile.Account, cloudFile.Container, relativeUrl.ToString(), tempPath);
 566
 567             //Create the local folder if it doesn't exist (necessary for shared objects)
 568             var localFolder = Path.GetDirectoryName(localPath);
 569             if (!Directory.Exists(localFolder))
 570                 Directory.CreateDirectory(localFolder);
 571             //And move it to its actual location once downloading is finished
 572             if (File.Exists(localPath))
 573                 File.Replace(tempPath,localPath,null,true);
 574             else
 575                 File.Move(tempPath,localPath);
 576             //Notify listeners that a local file has changed
 577             StatusNotification.NotifyChangedFile(localPath);
 578
 579
 580         }
 581
 582         //Download a file asynchronously using blocks
 583         public async Task DownloadWithBlocks(AccountInfo accountInfo, CloudFilesClient client, ObjectInfo cloudFile, Uri relativeUrl, string filePath, TreeHash serverHash)
 584         {
 585             if (client == null)
 586                 throw new ArgumentNullException("client");
 587             if (cloudFile == null)
 588                 throw new ArgumentNullException("cloudFile");
 589             if (relativeUrl == null)
 590                 throw new ArgumentNullException("relativeUrl");
 591             if (String.IsNullOrWhiteSpace(filePath))
 592                 throw new ArgumentNullException("filePath");
 593             if (!Path.IsPathRooted(filePath))
 594                 throw new ArgumentException("The filePath must be rooted", "filePath");
 595             if (serverHash == null)
 596                 throw new ArgumentNullException("serverHash");
 597             Contract.EndContractBlock();
 598
 599            var fileAgent = GetFileAgent(accountInfo);
 600             var localPath = Interfaces.FileInfoExtensions.GetProperFilePathCapitalization(filePath);
 601
 602             //Calculate the relative file path for the new file
 603             var relativePath = relativeUrl.RelativeUriToFilePath();
 604             var blockUpdater = new BlockUpdater(fileAgent.CachePath, localPath, relativePath, serverHash);
 605
 606
 607
 608             //Calculate the file's treehash
 609             var treeHash = await Signature.CalculateTreeHashAsync(localPath, serverHash.BlockSize, serverHash.BlockHash, 2);
 610
 611             //And compare it with the server's hash
 612             var upHashes = serverHash.GetHashesAsStrings();
 613             var localHashes = treeHash.HashDictionary;
 614             for (int i = 0; i < upHashes.Length; i++)
 615             {
 616                 //For every non-matching hash
 617                 var upHash = upHashes[i];
 618                 if (!localHashes.ContainsKey(upHash))
 619                 {
 620                     StatusNotification.Notify(new CloudNotification { Data = cloudFile });
 621
 622                     if (blockUpdater.UseOrphan(i, upHash))
 623                     {
 624                         Log.InfoFormat("[BLOCK GET] ORPHAN FOUND for {0} of {1} for {2}", i, upHashes.Length, localPath);
 625                         continue;
 626                     }
 627                     Log.InfoFormat("[BLOCK GET] START {0} of {1} for {2}", i, upHashes.Length, localPath);
 628                     var start = i*serverHash.BlockSize;
 629                     //To download the last block just pass a null for the end of the range
 630                     long? end = null;
 631                     if (i < upHashes.Length - 1 )
 632                         end= ((i + 1)*serverHash.BlockSize) ;
 633
 634                     //Download the missing block
 635                     var block = await client.GetBlock(cloudFile.Account, cloudFile.Container, relativeUrl, start, end);
 636
 637                     //and store it
 638                     blockUpdater.StoreBlock(i, block);
 639
 640
 641                     Log.InfoFormat("[BLOCK GET] FINISH {0} of {1} for {2}", i, upHashes.Length, localPath);
 642                 }
 643             }
 644
 645             //Want to avoid notifications if no changes were made
 646             var hasChanges = blockUpdater.HasBlocks;
 647             blockUpdater.Commit();
 648
 649             if (hasChanges)
 650                 //Notify listeners that a local file has changed
 651                 StatusNotification.NotifyChangedFile(localPath);
 652
 653             Log.InfoFormat("[BLOCK GET] COMPLETE {0}", localPath);
 654         }
 655
 656
 657         private async Task UploadCloudFile(CloudAction action)
 658         {
 659             if (action == null)
 660                 throw new ArgumentNullException("action");
 661             Contract.EndContractBlock();
 662
 663             try
 664             {
 665                 var accountInfo = action.AccountInfo;
 666
 667                 var fileInfo = action.LocalFile;
 668
 669                 if (fileInfo.Extension.Equals("ignore", StringComparison.InvariantCultureIgnoreCase))
 670                     return;
 671
 672                 var relativePath = fileInfo.AsRelativeTo(accountInfo.AccountPath);
 673                 if (relativePath.StartsWith(FolderConstants.OthersFolder))
 674                 {
 675                     var parts = relativePath.Split('\\');
 676                     var accountName = parts[1];
 677                     var oldName = accountInfo.UserName;
 678                     var absoluteUri = accountInfo.StorageUri.AbsoluteUri;
 679                     var nameIndex = absoluteUri.IndexOf(oldName);
 680                     var root = absoluteUri.Substring(0, nameIndex);
 681
 682                     accountInfo = new AccountInfo
 683                     {
 684                         UserName = accountName,
 685                         AccountPath = Path.Combine(accountInfo.AccountPath, parts[0], parts[1]),
 686                         StorageUri = new Uri(root + accountName),
 687                         BlockHash = accountInfo.BlockHash,
 688                         BlockSize = accountInfo.BlockSize,
 689                         Token = accountInfo.Token
 690                     };
 691                 }
 692
 693
 694                 var fullFileName = fileInfo.GetProperCapitalization();
 695                 using (var gate = NetworkGate.Acquire(fullFileName, NetworkOperation.Uploading))
 696                 {
 697                     //Abort if the file is already being uploaded or downloaded
 698                     if (gate.Failed)
 699                         return;
 700
 701                     var cloudFile = action.CloudFile;
 702                     var account = cloudFile.Account ?? accountInfo.UserName;
 703
 704                     var client = new CloudFilesClient(accountInfo);
 705                     //Even if GetObjectInfo times out, we can proceed with the upload
 706                     var info = client.GetObjectInfo(account, cloudFile.Container, cloudFile.Name);
 707
 708                     //If this is a read-only file, do not upload changes
 709                     if (info.AllowedTo == "read")
 710                         return;
 711
 712                     //TODO: Check how a directory hash is calculated -> All dirs seem to have the same hash
 713                     if (fileInfo is DirectoryInfo)
 714                     {
 715                         //If the directory doesn't exist the Hash property will be empty
 716                         if (String.IsNullOrWhiteSpace(info.Hash))
 717                             //Go on and create the directory
 718                             await client.PutObject(account, cloudFile.Container, cloudFile.Name, fullFileName, String.Empty, "application/directory");
 719                     }
 720                     else
 721                     {
 722
 723                         var cloudHash = info.Hash.ToLower();
 724
 725                         var hash = action.LocalHash.Value;
 726                         var topHash = action.TopHash.Value;
 727
 728                         //If the file hashes match, abort the upload
 729                         if (hash == cloudHash || topHash == cloudHash)
 730                         {
 731                             //but store any metadata changes
 732                             StatusKeeper.StoreInfo(fullFileName, info);
 733                             Log.InfoFormat("Skip upload of {0}, hashes match", fullFileName);
 734                             return;
 735                         }
 736
 737
 738                         //Mark the file as modified while we upload it
 739                         StatusKeeper.SetFileOverlayStatus(fullFileName, FileOverlayStatus.Modified);
 740                         //And then upload it
 741
 742                         //Upload even small files using the Hashmap. The server may already contain
 743                         //the relevant block
 744
 745                         //First, calculate the tree hash
 746                         var treeHash = await Signature.CalculateTreeHashAsync(fullFileName, accountInfo.BlockSize,
 747                                                                               accountInfo.BlockHash, 2);
 748
 749                         await UploadWithHashMap(accountInfo, cloudFile, fileInfo as FileInfo, cloudFile.Name, treeHash);
 750                     }
 751                     //If everything succeeds, change the file and overlay status to normal
 752                     StatusKeeper.SetFileState(fullFileName, FileStatus.Unchanged, FileOverlayStatus.Normal);
 753                 }
 754                 //Notify the Shell to update the overlays
 755                 NativeMethods.RaiseChangeNotification(fullFileName);
 756                 StatusNotification.NotifyChangedFile(fullFileName);
 757             }
 758             catch (AggregateException ex)
 759             {
 760                 var exc = ex.InnerException as WebException;
 761                 if (exc == null)
 762                     throw ex.InnerException;
 763                 if (HandleUploadWebException(action, exc))
 764                     return;
 765                 throw;
 766             }
 767             catch (WebException ex)
 768             {
 769                 if (HandleUploadWebException(action, ex))
 770                     return;
 771                 throw;
 772             }
 773             catch (Exception ex)
 774             {
 775                 Log.Error("Unexpected error while uploading file", ex);
 776                 throw;
 777             }
 778
 779         }
 780
 781
 782
 783         private bool HandleUploadWebException(CloudAction action, WebException exc)
 784         {
 785             var response = exc.Response as HttpWebResponse;
 786             if (response == null)
 787                 throw exc;
 788             if (response.StatusCode == HttpStatusCode.Unauthorized)
 789             {
 790                 Log.Error("Not allowed to upload file", exc);
 791                 var message = String.Format("Not allowed to uplad file {0}", action.LocalFile.FullName);
 792                 StatusKeeper.SetFileState(action.LocalFile.FullName, FileStatus.Unchanged, FileOverlayStatus.Normal);
 793                 StatusNotification.NotifyChange(message, TraceLevel.Warning);
 794                 return true;
 795             }
 796             return false;
 797         }
 798
 799         public async Task UploadWithHashMap(AccountInfo accountInfo,ObjectInfo cloudFile,FileInfo fileInfo,string url,TreeHash treeHash)
 800         {
 801             if (accountInfo == null)
 802                 throw new ArgumentNullException("accountInfo");
 803             if (cloudFile==null)
 804                 throw new ArgumentNullException("cloudFile");
 805             if (fileInfo == null)
 806                 throw new ArgumentNullException("fileInfo");
 807             if (String.IsNullOrWhiteSpace(url))
 808                 throw new ArgumentNullException(url);
 809             if (treeHash==null)
 810                 throw new ArgumentNullException("treeHash");
 811             if (String.IsNullOrWhiteSpace(cloudFile.Container) )
 812                 throw new ArgumentException("Invalid container","cloudFile");
 813             Contract.EndContractBlock();
 814
 815             var fullFileName = fileInfo.GetProperCapitalization();
 816
 817             var account = cloudFile.Account ?? accountInfo.UserName;
 818             var container = cloudFile.Container ;
 819
 820             var client = new CloudFilesClient(accountInfo);
 821             //Send the hashmap to the server
 822             var missingHashes =  await client.PutHashMap(account, container, url, treeHash);
 823             //If the server returns no missing hashes, we are done
 824             while (missingHashes.Count > 0)
 825             {
 826
 827                 var buffer = new byte[accountInfo.BlockSize];
 828                 foreach (var missingHash in missingHashes)
 829                 {
 830                     //Find the proper block
 831                     var blockIndex = treeHash.HashDictionary[missingHash];
 832                     var offset = blockIndex*accountInfo.BlockSize;
 833
 834                     var read = fileInfo.Read(buffer, offset, accountInfo.BlockSize);
 835
 836                     try
 837                     {
 838                         //And upload the block
 839                         await client.PostBlock(account, container, buffer, 0, read);
 840                         Log.InfoFormat("[BLOCK] Block {0} of {1} uploaded", blockIndex, fullFileName);
 841                     }
 842                     catch (Exception exc)
 843                     {
 844                         Log.ErrorFormat("[ERROR] uploading block {0} of {1}\n{2}", blockIndex, fullFileName, exc);
 845                     }
 846
 847                 }
 848
 849                 //Repeat until there are no more missing hashes
 850                 missingHashes = await client.PutHashMap(account, container, url, treeHash);
 851             }
 852         }
 853
 854
 855         public void AddAccount(AccountInfo accountInfo)
 856         {
 857             if (!_accounts.Contains(accountInfo))
 858                 _accounts.Add(accountInfo);
 859         }
 860     }
 861
 862
 863
 864
 865 }