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// -----------------------------------------------------------------------
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// <copyright file="NetworkAgent.cs" company="GRNET">
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// Copyright 2011 GRNET S.A. All rights reserved.
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// 
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// Redistribution and use in source and binary forms, with or
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// without modification, are permitted provided that the following
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// conditions are met:
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// 
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//   1. Redistributions of source code must retain the above
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//      copyright notice, this list of conditions and the following
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//      disclaimer.
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// 
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//   2. Redistributions in binary form must reproduce the above
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//      copyright notice, this list of conditions and the following
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//      disclaimer in the documentation and/or other materials
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//      provided with the distribution.
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// 
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// THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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// OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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// USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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// AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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// 
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// The views and conclusions contained in the software and
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// documentation are those of the authors and should not be
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// interpreted as representing official policies, either expressed
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// or implied, of GRNET S.A.
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// </copyright>
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// -----------------------------------------------------------------------
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using System;
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using System.Collections.Concurrent;
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using System.Collections.Generic;
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using System.ComponentModel.Composition;
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using System.Diagnostics;
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using System.Diagnostics.Contracts;
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using System.IO;
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using System.Linq;
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using System.Net;
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using System.Threading;
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using System.Threading.Tasks;
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using System.Threading.Tasks.Dataflow;
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using Castle.ActiveRecord;
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using Pithos.Interfaces;
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using Pithos.Network;
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using log4net;
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55
namespace Pithos.Core.Agents
56
{
57
    //TODO: Ensure all network operations use exact casing. Pithos is case sensitive
58
    [Export]
59
    public class NetworkAgent
60
    {
61
        private Agent<CloudAction> _agent;
62

    
63
        //A separate agent is used to execute delete actions immediatelly;
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        private ActionBlock<CloudDeleteAction> _deleteAgent;
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        readonly ConcurrentDictionary<string,DateTime> _deletedFiles=new ConcurrentDictionary<string, DateTime>();
66

    
67

    
68
        private readonly ManualResetEventSlim _pauseAgent = new ManualResetEventSlim(true);
69

    
70
        [System.ComponentModel.Composition.Import]
71
        public IStatusKeeper StatusKeeper { get; set; }
72
        
73
        public IStatusNotification StatusNotification { get; set; }
74

    
75
        private static readonly ILog Log = LogManager.GetLogger("NetworkAgent");
76

    
77
        private readonly ConcurrentBag<AccountInfo> _accounts = new ConcurrentBag<AccountInfo>();
78

    
79
        [System.ComponentModel.Composition.Import]
80
        public IPithosSettings Settings { get; set; }
81

    
82
        private bool _firstPoll = true;
83
        private TaskCompletionSource<bool> _tcs;
84

    
85
        public void Start()
86
        {
87
            _firstPoll = true;
88
            _agent = Agent<CloudAction>.Start(inbox =>
89
            {
90
                Action loop = null;
91
                loop = () =>
92
                {
93
                    _pauseAgent.Wait();
94
                    var message = inbox.Receive();
95
                    var process=message.Then(Process,inbox.CancellationToken);
96
                    inbox.LoopAsync(process, loop);
97
                };
98
                loop();
99
            });
100

    
101
            _deleteAgent = new ActionBlock<CloudDeleteAction>(message =>ProcessDelete(message),new ExecutionDataflowBlockOptions{MaxDegreeOfParallelism=4});
102
            /*
103
                Action loop = null;
104
                loop = () =>
105
                            {
106
                                var message = inbox.Receive();
107
                                var process = message.Then(ProcessDelete,inbox.CancellationToken);
108
                                inbox.LoopAsync(process, loop);
109
                            };
110
                loop();
111
*/
112

    
113
        }
114

    
115
        private async Task Process(CloudAction action)
116
        {
117
            if (action == null)
118
                throw new ArgumentNullException("action");
119
            if (action.AccountInfo==null)
120
                throw new ArgumentException("The action.AccountInfo is empty","action");
121
            Contract.EndContractBlock();
122

    
123
            var accountInfo = action.AccountInfo;
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

    
135
                    if (action.Action == CloudActionType.DeleteCloud)
136
                    {
137
                        //Redirect deletes to the delete agent 
138
                        _deleteAgent.Post((CloudDeleteAction)action);                        
139
                    }
140
                    if (IsDeletedFile(action))
141
                    {
142
                        //Clear the status of already deleted files to avoid reprocessing
143
                        if (action.LocalFile != null)
144
                            this.StatusKeeper.ClearFileStatus(action.LocalFile.FullName);
145
                    }
146
                    else
147
                    {
148
                        switch (action.Action)
149
                        {
150
                            case CloudActionType.UploadUnconditional:
151
                                //Abort if the file was deleted before we reached this point
152
                                await UploadCloudFile(action);
153
                                break;
154
                            case CloudActionType.DownloadUnconditional:
155
                                await DownloadCloudFile(accountInfo, cloudFile, downloadPath);
156
                                break;
157
                            case CloudActionType.RenameCloud:
158
                                var moveAction = (CloudMoveAction) action;
159
                                RenameCloudFile(accountInfo, moveAction);
160
                                break;
161
                            case CloudActionType.MustSynch:
162
                                if (!File.Exists(downloadPath) && !Directory.Exists(downloadPath))
163
                                {
164
                                    await DownloadCloudFile(accountInfo, cloudFile, downloadPath);
165
                                }
166
                                else
167
                                {
168
                                    await SyncFiles(accountInfo, action);
169
                                }
170
                                break;
171
                        }
172
                    }
173
                    Log.InfoFormat("[ACTION] End Processing {0}:{1}->{2}", action.Action, action.LocalFile,
174
                                           action.CloudFile.Name);
175
                }
176
                catch (WebException exc)
177
                {
178
                    Log.ErrorFormat("[WEB ERROR] {0} : {1} -> {2} due to exception\r\n{3}", action.Action, action.LocalFile, action.CloudFile, exc);
179
                }
180
                catch (OperationCanceledException)
181
                {
182
                    throw;
183
                }
184
                catch (DirectoryNotFoundException)
185
                {
186
                    Log.ErrorFormat("{0} : {1} -> {2}  failed because the directory was not found.\n Rescheduling a delete",
187
                        action.Action, action.LocalFile, action.CloudFile);
188
                    //Post a delete action for the missing file
189
                    Post(new CloudDeleteAction(action));                    
190
                }
191
                catch (FileNotFoundException)
192
                {
193
                    Log.ErrorFormat("{0} : {1} -> {2}  failed because the file was not found.\n Rescheduling a delete",
194
                        action.Action, action.LocalFile, action.CloudFile);
195
                    //Post a delete action for the missing file
196
                    Post(new CloudDeleteAction(action));
197
                }
198
                catch (Exception exc)
199
                {
200
                    Log.ErrorFormat("[REQUEUE] {0} : {1} -> {2} due to exception\r\n{3}",
201
                                     action.Action, action.LocalFile, action.CloudFile, exc);
202

    
203
                    _agent.Post(action);
204
                }                
205
            }
206
        }
207

    
208
        /// <summary>
209
        /// Processes cloud delete actions
210
        /// </summary>
211
        /// <param name="action">The delete action to execute</param>
212
        /// <returns></returns>
213
        /// <remarks>
214
        /// When a file/folder is deleted locally, we must delete it ASAP from the server and block any download
215
        /// operations that may be in progress.
216
        /// <para>
217
        /// A separate agent is used to process deletes because the main agent may be busy with a long operation.
218
        /// </para>
219
        /// </remarks>
220
        private async Task ProcessDelete(CloudDeleteAction action)
221
        {
222
            if (action == null)
223
                throw new ArgumentNullException("action");
224
            if (action.AccountInfo==null)
225
                throw new ArgumentException("The action.AccountInfo is empty","action");
226
            Contract.EndContractBlock();
227

    
228
            var accountInfo = action.AccountInfo;
229

    
230
            using (log4net.ThreadContext.Stacks["NETWORK"].Push("PROCESS"))
231
            {                
232
                Log.InfoFormat("[ACTION] Start Processing {0}", action);
233

    
234
                var cloudFile = action.CloudFile;
235

    
236
                try
237
                {
238
                    //Acquire a lock on the deleted file to prevent uploading/downloading operations from the normal
239
                    //agent
240
                    using (var gate = NetworkGate.Acquire(action.LocalFile.FullName, NetworkOperation.Deleting))
241
                    {
242

    
243
                        //Add the file URL to the deleted files list
244
                        var key = GetFileKey(action.CloudFile);
245
                        _deletedFiles[key] = DateTime.Now;
246

    
247
                        _pauseAgent.Reset();
248
                        // and then delete the file from the server
249
                        DeleteCloudFile(accountInfo, cloudFile);
250

    
251
                        Log.InfoFormat("[ACTION] End Delete {0}:{1}->{2}", action.Action, action.LocalFile,
252
                                       action.CloudFile.Name);
253
                    }
254
                }
255
                catch (WebException exc)
256
                {
257
                    Log.ErrorFormat("[WEB ERROR] {0} : {1} -> {2} due to exception\r\n{3}", action.Action, action.LocalFile, action.CloudFile, exc);
258
                }
259
                catch (OperationCanceledException)
260
                {
261
                    throw;
262
                }
263
                catch (DirectoryNotFoundException)
264
                {
265
                    Log.ErrorFormat("{0} : {1} -> {2}  failed because the directory was not found.\n Rescheduling a delete",
266
                        action.Action, action.LocalFile, action.CloudFile);
267
                    //Repost a delete action for the missing file
268
                    _deleteAgent.Post(action);
269
                }
270
                catch (FileNotFoundException)
271
                {
272
                    Log.ErrorFormat("{0} : {1} -> {2}  failed because the file was not found.\n Rescheduling a delete",
273
                        action.Action, action.LocalFile, action.CloudFile);
274
                    //Post a delete action for the missing file
275
                    _deleteAgent.Post(action);
276
                }
277
                catch (Exception exc)
278
                {
279
                    Log.ErrorFormat("[REQUEUE] {0} : {1} -> {2} due to exception\r\n{3}",
280
                                     action.Action, action.LocalFile, action.CloudFile, exc);
281

    
282
                    _deleteAgent.Post(action);
283
                }
284
                finally
285
                {
286
                    if (_deleteAgent.InputCount == 0)
287
                        _pauseAgent.Set();
288

    
289
                }
290
            }
291
        }
292

    
293
        private static string GetFileKey(ObjectInfo info)
294
        {
295
            var key = String.Format("{0}/{1}/{2}", info.Account, info.Container,info.Name);
296
            return key;
297
        }
298

    
299
        private async Task SyncFiles(AccountInfo accountInfo,CloudAction action)
300
        {
301
            if (accountInfo == null)
302
                throw new ArgumentNullException("accountInfo");
303
            if (action==null)
304
                throw new ArgumentNullException("action");
305
            if (action.LocalFile==null)
306
                throw new ArgumentException("The action's local file is not specified","action");
307
            if (!Path.IsPathRooted(action.LocalFile.FullName))
308
                throw new ArgumentException("The action's local file path must be absolute","action");
309
            if (action.CloudFile== null)
310
                throw new ArgumentException("The action's cloud file is not specified", "action");
311
            Contract.EndContractBlock();
312

    
313
            var localFile = action.LocalFile;
314
            var cloudFile = action.CloudFile;
315
            var downloadPath=action.LocalFile.GetProperCapitalization();
316

    
317
            var cloudHash = cloudFile.Hash.ToLower();
318
            var localHash = action.LocalHash.Value.ToLower();
319
            var topHash = action.TopHash.Value.ToLower();
320

    
321
            //Not enough to compare only the local hashes, also have to compare the tophashes
322
            
323
            //If any of the hashes match, we are done
324
            if ((cloudHash == localHash || cloudHash == topHash))
325
            {
326
                Log.InfoFormat("Skipping {0}, hashes match",downloadPath);
327
                return;
328
            }
329

    
330
            //The hashes DON'T match. We need to sync
331
            var lastLocalTime = localFile.LastWriteTime;
332
            var lastUpTime = cloudFile.Last_Modified;
333
            
334
            //If the local file is newer upload it
335
            if (lastUpTime <= lastLocalTime)
336
            {
337
                //It probably means it was changed while the app was down                        
338
                UploadCloudFile(action);
339
            }
340
            else
341
            {
342
                //It the cloud file has a later date, it was modified by another user or computer.
343
                //We need to check the local file's status                
344
                var status = StatusKeeper.GetFileStatus(downloadPath);
345
                switch (status)
346
                {
347
                    case FileStatus.Unchanged:                        
348
                        //If the local file's status is Unchanged, we can go on and download the newer cloud file
349
                        await DownloadCloudFile(accountInfo,cloudFile,downloadPath);
350
                        break;
351
                    case FileStatus.Modified:
352
                        //If the local file is Modified, we may have a conflict. In this case we should mark the file as Conflict
353
                        //We can't ensure that a file modified online since the last time will appear as Modified, unless we 
354
                        //index all files before we start listening.                       
355
                    case FileStatus.Created:
356
                        //If the local file is Created, it means that the local and cloud files aren't related,
357
                        // yet they have the same name.
358

    
359
                        //In both cases we must mark the file as in conflict
360
                        ReportConflict(downloadPath);
361
                        break;
362
                    default:
363
                        //Other cases should never occur. Mark them as Conflict as well but log a warning
364
                        ReportConflict(downloadPath);
365
                        Log.WarnFormat("Unexcepted status {0} for file {1}->{2}", status,
366
                                       downloadPath, action.CloudFile.Name);
367
                        break;
368
                }
369
            }
370
        }
371

    
372
        private void ReportConflict(string downloadPath)
373
        {
374
            if (String.IsNullOrWhiteSpace(downloadPath))
375
                throw new ArgumentNullException("downloadPath");
376
            Contract.EndContractBlock();
377

    
378
            StatusKeeper.SetFileOverlayStatus(downloadPath, FileOverlayStatus.Conflict);
379
            var message = String.Format("Conflict detected for file {0}", downloadPath);
380
            Log.Warn(message);
381
            StatusNotification.NotifyChange(message, TraceLevel.Warning);
382
        }
383

    
384
        public void Post(CloudAction cloudAction)
385
        {
386
            if (cloudAction == null)
387
                throw new ArgumentNullException("cloudAction");
388
            if (cloudAction.AccountInfo==null)
389
                throw new ArgumentException("The CloudAction.AccountInfo is empty","cloudAction");
390
            Contract.EndContractBlock();
391

    
392
            _pauseAgent.Wait();
393

    
394
            //If the action targets a local file, add a treehash calculation
395
            if (!(cloudAction is CloudDeleteAction) && cloudAction.LocalFile as FileInfo != null)
396
            {
397
                var accountInfo = cloudAction.AccountInfo;
398
                var localFile = (FileInfo) cloudAction.LocalFile;
399
                if (localFile.Length > accountInfo.BlockSize)
400
                    cloudAction.TopHash =
401
                        new Lazy<string>(() => Signature.CalculateTreeHashAsync(localFile,
402
                                                                                accountInfo.BlockSize,
403
                                                                                accountInfo.BlockHash).Result
404
                                                    .TopHash.ToHashString());
405
                else
406
                {
407
                    cloudAction.TopHash = new Lazy<string>(() => cloudAction.LocalHash.Value);
408
                }
409
            }
410
            else
411
            {
412
                //The hash for a directory is the empty string
413
                cloudAction.TopHash = new Lazy<string>(() => String.Empty);
414
            }
415
            
416
            if (cloudAction is CloudDeleteAction)
417
                _deleteAgent.Post((CloudDeleteAction)cloudAction);
418
            else
419
                _agent.Post(cloudAction);
420
        }
421

    
422
       /* class ObjectInfoByNameComparer:IEqualityComparer<ObjectInfo>
423
        {
424
            public bool Equals(ObjectInfo x, ObjectInfo y)
425
            {
426
                return x.Name.Equals(y.Name,StringComparison.InvariantCultureIgnoreCase);
427
            }
428

    
429
            public int GetHashCode(ObjectInfo obj)
430
            {
431
                return obj.Name.ToLower().GetHashCode();
432
            }
433
        }*/
434

    
435
        public void SynchNow()
436
        {             
437
            if (_tcs!=null)
438
                _tcs.SetResult(true);
439
            else
440
            {
441
                //TODO: This may be OK for testing purposes, but we have no guarantee that it will
442
                //work properly in production
443
                PollRemoteFiles(repeat:false);
444
            }
445
        }
446

    
447
        //Remote files are polled periodically. Any changes are processed
448
        public async Task PollRemoteFiles(DateTime? since = null,bool repeat=true)
449
        {
450

    
451
            _tcs = new TaskCompletionSource<bool>();
452
            var wait = TaskEx.Delay(TimeSpan.FromSeconds(Settings.PollingInterval), _agent.CancellationToken);
453
            var signaledTask=await TaskEx.WhenAny(_tcs.Task,wait);
454
            //If polling is signalled by SynchNow, ignore the since tag
455
            if (signaledTask is Task<bool>)
456
                since = null;
457

    
458
            using (log4net.ThreadContext.Stacks["Retrieve Remote"].Push("All accounts"))
459
            {
460

    
461
                try
462
                {
463
                    //Next time we will check for all changes since the current check minus 1 second
464
                    //This is done to ensure there are no discrepancies due to clock differences
465
                    DateTime nextSince = DateTime.Now.AddSeconds(-1);
466

    
467
                    var tasks = from accountInfo in _accounts
468
                                select ProcessAccountFiles(accountInfo, since);
469

    
470
                    await TaskEx.WhenAll(tasks.ToList());
471

    
472
                    _firstPoll = false;
473
                    if (repeat)
474
                        PollRemoteFiles(nextSince);
475
                }
476
                catch (Exception ex)
477
                {
478
                    Log.ErrorFormat("Error while processing accounts\r\n{0}",ex);
479
                    //In case of failure retry with the same parameter
480
                    PollRemoteFiles(since);
481
                }
482
                
483

    
484
            }
485
        }
486

    
487
        public async Task ProcessAccountFiles(AccountInfo accountInfo,DateTime? since=null)
488
        {   
489
            if (accountInfo==null)
490
                throw new ArgumentNullException("accountInfo");
491
            if (String.IsNullOrWhiteSpace(accountInfo.AccountPath))
492
                throw new ArgumentException("The AccountInfo.AccountPath is empty","accountInfo");
493
            Contract.EndContractBlock();
494

    
495
            using (log4net.ThreadContext.Stacks["Retrieve Remote"].Push(accountInfo.UserName))
496
            {
497
                Log.Info("Scheduled");
498
                var client=new CloudFilesClient(accountInfo);
499

    
500
                var containers = client.ListContainers(accountInfo.UserName);
501
                
502
                CreateContainerFolders(accountInfo, containers);
503

    
504
                try
505
                {
506
                    _pauseAgent.Wait();
507
                    //Get the poll time now. We may miss some deletions but it's better to keep a file that was deleted
508
                    //than delete a file that was created while we were executing the poll
509
                    var pollTime = DateTime.Now;
510
                    
511
                    //Get the list of server objects changed since the last check
512
                    //The name of the container is passed as state in order to create a dictionary of tasks in a subsequent step
513
                    var listObjects = from container in containers
514
                                      select  Task<IList<ObjectInfo>>.Factory.StartNew(_ =>
515
                                            client.ListObjects(accountInfo.UserName,container.Name, since),container.Name);
516

    
517

    
518
                    var listTasks = await Task.Factory.WhenAll(listObjects.ToArray());
519

    
520
                    using (log4net.ThreadContext.Stacks["SCHEDULE"].Push("Process Results"))
521
                    {
522
                        var dict = listTasks.ToDictionary(t => t.AsyncState);
523

    
524
                        //Get all non-trash objects. Remember, the container name is stored in AsyncState
525
                        var remoteObjects = from objectList in listTasks
526
                                            where (string) objectList.AsyncState != "trash"
527
                                            from obj in objectList.Result
528
                                            select obj;
529

    
530
                        //TODO: Change the way deleted objects are detected.
531
                        //The list operation returns all existing objects so we could detect deleted remote objects
532
                        //by detecting objects that exist only locally. There are several cases where this is NOT the case:
533
                        //1.    The first time the application runs, as there may be files that were added while 
534
                        //      the application was down.
535
                        //2.    An object that is currently being uploaded will not appear in the remote list
536
                        //      until the upload finishes.
537
                        //      SOLUTION 1: Check the upload/download queue for the file
538
                        //      SOLUTION 2: Check the SQLite states for the file's entry. If it is being uploaded, 
539
                        //          or its last modification was after the current poll, don't delete it. This way we don't
540
                        //          delete objects whose upload finished too late to be included in the list.
541
                        //We need to detect and protect against such situations
542
                        //TODO: Does FileState have a LastModification field?
543
                        //TODO: How do we update the LastModification field? Do we need to add SQLite triggers?
544
                        //      Do we need to use a proper SQLite schema?
545
                        //      We can create a trigger with 
546
                        // CREATE TRIGGER IF NOT EXISTS update_last_modified UPDATE ON FileState FOR EACH ROW
547
                        //  BEGIN
548
                        //      UPDATE FileState SET LastModification=datetime('now')  WHERE Id=old.Id;
549
                        //  END;
550
                        //
551
                        //NOTE: Some files may have been deleted remotely while the application was down. 
552
                        //  We DO have to delete those files. Checking the trash makes it easy to detect them,
553
                        //  Otherwise, we can't be really sure whether we need to upload or delete 
554
                        //  the local-only files.
555
                        //  SOLUTION 1: Ask the user when such a local-only file is detected during the first poll.
556
                        //  SOLUTION 2: Mark conflict and ask the user as in #1
557

    
558
                        var trashObjects = dict["trash"].Result;
559
                        //var sharedObjects = ((Task<IList<ObjectInfo>>) task.Result[2]).Result;
560

    
561
                        //Items with the same name, hash may be both in the container and the trash
562
                        //Don't delete items that exist in the container
563
                        var realTrash = from trash in trashObjects
564
                                        where
565
                                            !remoteObjects.Any(
566
                                                info => info.Name == trash.Name && info.Hash == trash.Hash)
567
                                        select trash;
568
                        ProcessTrashedFiles(accountInfo, realTrash);
569

    
570

    
571
                        var cleanRemotes = (from info in remoteObjects
572
                                     //.Union(sharedObjects)
573
                                     let name = info.Name
574
                                     where !name.EndsWith(".ignore", StringComparison.InvariantCultureIgnoreCase) &&
575
                                           !name.StartsWith(FolderConstants.CacheFolder + "/",
576
                                                            StringComparison.InvariantCultureIgnoreCase)
577
                                     select info).ToList();
578

    
579

    
580

    
581
                        ProcessDeletedFiles(accountInfo, cleanRemotes, pollTime);
582

    
583
                        //Create a list of actions from the remote files
584
                        var allActions = ObjectsToActions(accountInfo, cleanRemotes);
585

    
586
                        
587
                        //var relativePath = objectInfo.RelativeUrlToFilePath(accountInfo.UserName);
588

    
589
                        //And remove those that are already being processed by the agent
590
                        var distinctActions = allActions
591
                            .Except(_agent.GetEnumerable(), new PithosMonitor.LocalFileComparer())
592
                            .ToList();
593

    
594
                        //Queue all the actions
595
                        foreach (var message in distinctActions)
596
                        {
597
                            Post(message);
598
                        }
599

    
600
                        Log.Info("[LISTENER] End Processing");
601
                    }
602
                }
603
                catch (Exception ex)
604
                {
605
                    Log.ErrorFormat("[FAIL] ListObjects for{0} in ProcessRemoteFiles with {1}", accountInfo.UserName, ex);
606
                    return;
607
                }
608

    
609
                Log.Info("[LISTENER] Finished");
610

    
611
            }
612
        }
613

    
614
        /// <summary>
615
        /// Deletes local files that are not found in the list of cloud files
616
        /// </summary>
617
        /// <param name="accountInfo"></param>
618
        /// <param name="cloudFiles"></param>
619
        /// <param name="pollTime"></param>
620
        private void ProcessDeletedFiles(AccountInfo accountInfo, IEnumerable<ObjectInfo> cloudFiles, DateTime pollTime)
621
        {
622
            if (accountInfo == null)
623
                throw new ArgumentNullException("accountInfo");
624
            if (String.IsNullOrWhiteSpace(accountInfo.AccountPath))
625
                throw new ArgumentException("The AccountInfo.AccountPath is empty", "accountInfo");
626
            if (cloudFiles == null)
627
                throw new ArgumentNullException("cloudFiles");
628
            Contract.EndContractBlock();
629

    
630
            if (_firstPoll) return;
631

    
632
            var deleteCandidates = from state in FileState.Queryable
633
                                   where state.Modified <= pollTime && state.FilePath.StartsWith(accountInfo.AccountPath)
634
                                   select state;
635

    
636
            foreach (var deleteCandidate in deleteCandidates)
637
            {
638
                var localFile = FileInfoExtensions.FromPath(deleteCandidate.FilePath);
639
                var relativeFilePath=localFile.AsRelativeTo(accountInfo.AccountPath);
640
                if (!cloudFiles.Any(r => Path.Combine(r.Container, r.Name) == relativeFilePath))
641
                {
642
                    localFile.Delete();
643
                    StatusKeeper.ClearFileStatus(deleteCandidate.FilePath);
644
                }
645
            }
646
        }
647

    
648
        private static void CreateContainerFolders(AccountInfo accountInfo, IEnumerable<ContainerInfo> containers)
649
        {
650
            var containerPaths = from container in containers
651
                                 let containerPath = Path.Combine(accountInfo.AccountPath, container.Name)
652
                                 where container.Name != FolderConstants.TrashContainer && !Directory.Exists(containerPath)
653
                                 select containerPath;
654

    
655
            foreach (var path in containerPaths)
656
            {
657
                Directory.CreateDirectory(path);
658
            }
659
        }
660

    
661
        //Creates an appropriate action for each server file
662
        private IEnumerable<CloudAction> ObjectsToActions(AccountInfo accountInfo,IEnumerable<ObjectInfo> remote)
663
        {
664
            if (remote==null)
665
                throw new ArgumentNullException();
666
            Contract.EndContractBlock();
667
            var fileAgent = GetFileAgent(accountInfo);
668

    
669
            //In order to avoid multiple iterations over the files, we iterate only once
670
            //over the remote files
671
            foreach (var objectInfo in remote)
672
            {
673
                var relativePath = objectInfo.RelativeUrlToFilePath(accountInfo.UserName);
674
                //and remove any matching objects from the list, adding them to the commonObjects list
675
                
676
                if (fileAgent.Exists(relativePath))
677
                {
678
                    //If a directory object already exists, we don't need to perform any other action                    
679
                    var localFile = fileAgent.GetFileSystemInfo(relativePath);
680
                    if (objectInfo.Content_Type == @"application/directory" && localFile is DirectoryInfo)
681
                        continue;
682
                    using (new SessionScope(FlushAction.Never))
683
                    {
684
                        var state =  StatusKeeper.GetStateByFilePath(localFile.FullName);
685
                        //FileState.FindByFilePath(localFile.FullName);
686
                        //Common files should be checked on a per-case basis to detect differences, which is newer
687

    
688
                        yield return new CloudAction(accountInfo, CloudActionType.MustSynch,
689
                                                     localFile, objectInfo, state, accountInfo.BlockSize,
690
                                                     accountInfo.BlockHash);
691
                    }
692
                }
693
                else
694
                {
695
                    //If there is no match we add them to the localFiles list
696
                    //but only if the file is not marked for deletion
697
                    var targetFile = Path.Combine(accountInfo.AccountPath, relativePath);
698
                    var fileStatus = StatusKeeper.GetFileStatus(targetFile);
699
                    if (fileStatus != FileStatus.Deleted)
700
                    {
701
                        //Remote files should be downloaded
702
                        yield return new CloudDownloadAction(accountInfo,objectInfo);
703
                    }
704
                }
705
            }            
706
        }
707

    
708
        private static FileAgent GetFileAgent(AccountInfo accountInfo)
709
        {
710
            return AgentLocator<FileAgent>.Get(accountInfo.AccountPath);
711
        }
712

    
713
        private void ProcessTrashedFiles(AccountInfo accountInfo,IEnumerable<ObjectInfo> trashObjects)
714
        {
715
            var fileAgent = GetFileAgent(accountInfo);
716
            foreach (var trashObject in trashObjects)
717
            {
718
                var barePath = trashObject.RelativeUrlToFilePath(accountInfo.UserName);
719
                //HACK: Assume only the "pithos" container is used. Must find out what happens when
720
                //deleting a file from a different container
721
                var relativePath = Path.Combine("pithos", barePath);
722
                fileAgent.Delete(relativePath);                                
723
            }
724
        }
725

    
726

    
727
        private void RenameCloudFile(AccountInfo accountInfo,CloudMoveAction action)
728
        {
729
            if (accountInfo==null)
730
                throw new ArgumentNullException("accountInfo");
731
            if (action==null)
732
                throw new ArgumentNullException("action");
733
            if (action.CloudFile==null)
734
                throw new ArgumentException("CloudFile","action");
735
            if (action.LocalFile==null)
736
                throw new ArgumentException("LocalFile","action");
737
            if (action.OldLocalFile==null)
738
                throw new ArgumentException("OldLocalFile","action");
739
            if (action.OldCloudFile==null)
740
                throw new ArgumentException("OldCloudFile","action");
741
            Contract.EndContractBlock();
742
            
743
            
744
            var newFilePath = action.LocalFile.FullName;
745
            
746
            //How do we handle concurrent renames and deletes/uploads/downloads?
747
            //* A conflicting upload means that a file was renamed before it had a chance to finish uploading
748
            //  This should never happen as the network agent executes only one action at a time
749
            //* A conflicting download means that the file was modified on the cloud. While we can go on and complete
750
            //  the rename, there may be a problem if the file is downloaded in blocks, as subsequent block requests for the 
751
            //  same name will fail.
752
            //  This should never happen as the network agent executes only one action at a time.
753
            //* A conflicting delete can happen if the rename was followed by a delete action that didn't have the chance
754
            //  to remove the rename from the queue.
755
            //  We can probably ignore this case. It will result in an error which should be ignored            
756

    
757
            
758
            //The local file is already renamed
759
            StatusKeeper.SetFileOverlayStatus(newFilePath, FileOverlayStatus.Modified);
760

    
761

    
762
            var account = action.CloudFile.Account ?? accountInfo.UserName;
763
            var container = action.CloudFile.Container;
764
            
765
            var client = new CloudFilesClient(accountInfo);
766
            //TODO: What code is returned when the source file doesn't exist?
767
            client.MoveObject(account, container, action.OldCloudFile.Name, container, action.CloudFile.Name);
768

    
769
            StatusKeeper.SetFileStatus(newFilePath, FileStatus.Unchanged);
770
            StatusKeeper.SetFileOverlayStatus(newFilePath, FileOverlayStatus.Normal);
771
            NativeMethods.RaiseChangeNotification(newFilePath);
772
        }
773

    
774
        private void DeleteCloudFile(AccountInfo accountInfo, ObjectInfo cloudFile)
775
        {
776
            if (accountInfo == null)
777
                throw new ArgumentNullException("accountInfo");
778
            if (cloudFile==null)
779
                throw new ArgumentNullException("cloudFile");
780

    
781
            if (String.IsNullOrWhiteSpace(cloudFile.Container))
782
                throw new ArgumentException("Invalid container", "cloudFile");
783
            Contract.EndContractBlock();
784
            
785
            var fileAgent = GetFileAgent(accountInfo);
786

    
787
            using ( log4net.ThreadContext.Stacks["DeleteCloudFile"].Push("Delete"))
788
            {
789
                var fileName= cloudFile.RelativeUrlToFilePath(accountInfo.UserName);
790
                var info = fileAgent.GetFileSystemInfo(fileName);                
791
                var fullPath = info.FullName.ToLower();
792

    
793
                StatusKeeper.SetFileOverlayStatus(fullPath, FileOverlayStatus.Modified);
794

    
795
                var account = cloudFile.Account ?? accountInfo.UserName;
796
                var container = cloudFile.Container ;//?? FolderConstants.PithosContainer;
797

    
798
                var client = new CloudFilesClient(accountInfo);
799
                client.DeleteObject(account, container, cloudFile.Name);
800

    
801
                StatusKeeper.ClearFileStatus(fullPath);
802
            }
803
        }
804

    
805
        //Download a file.
806
        private async Task DownloadCloudFile(AccountInfo accountInfo, ObjectInfo cloudFile , string filePath)
807
        {
808
            if (accountInfo == null)
809
                throw new ArgumentNullException("accountInfo");
810
            if (cloudFile == null)
811
                throw new ArgumentNullException("cloudFile");
812
            if (String.IsNullOrWhiteSpace(cloudFile.Account))
813
                throw new ArgumentNullException("cloudFile");
814
            if (String.IsNullOrWhiteSpace(cloudFile.Container))
815
                throw new ArgumentNullException("cloudFile");
816
            if (String.IsNullOrWhiteSpace(filePath))
817
                throw new ArgumentNullException("filePath");
818
            if (!Path.IsPathRooted(filePath))
819
                throw new ArgumentException("The filePath must be rooted", "filePath");
820
            Contract.EndContractBlock();
821

    
822
            var localPath = Interfaces.FileInfoExtensions.GetProperFilePathCapitalization(filePath);
823
            var relativeUrl = new Uri(cloudFile.Name, UriKind.Relative);
824

    
825
            var url = relativeUrl.ToString();
826
            if (cloudFile.Name.EndsWith(".ignore", StringComparison.InvariantCultureIgnoreCase))
827
                return;
828

    
829

    
830
            //Are we already downloading or uploading the file? 
831
            using (var gate=NetworkGate.Acquire(localPath, NetworkOperation.Downloading))
832
            {
833
                if (gate.Failed)
834
                    return;
835
                //The file's hashmap will be stored in the same location with the extension .hashmap
836
                //var hashPath = Path.Combine(FileAgent.CachePath, relativePath + ".hashmap");
837
                
838
                var client = new CloudFilesClient(accountInfo);
839
                var account = cloudFile.Account;
840
                var container = cloudFile.Container;
841

    
842
                if (cloudFile.Content_Type == @"application/directory")
843
                {
844
                    if (!Directory.Exists(localPath))
845
                        Directory.CreateDirectory(localPath);
846
                }
847
                else
848
                {
849
                    //Retrieve the hashmap from the server
850
                    var serverHash = await client.GetHashMap(account, container, url);
851
                    //If it's a small file
852
                    if (serverHash.Hashes.Count == 1)
853
                        //Download it in one go
854
                        await
855
                            DownloadEntireFileAsync(accountInfo, client, cloudFile, relativeUrl, localPath, serverHash);
856
                        //Otherwise download it block by block
857
                    else
858
                        await DownloadWithBlocks(accountInfo, client, cloudFile, relativeUrl, localPath, serverHash);
859

    
860
                    if (cloudFile.AllowedTo == "read")
861
                    {
862
                        var attributes = File.GetAttributes(localPath);
863
                        File.SetAttributes(localPath, attributes | FileAttributes.ReadOnly);                        
864
                    }
865
                }
866

    
867
                //Now we can store the object's metadata without worrying about ghost status entries
868
                StatusKeeper.StoreInfo(localPath, cloudFile);
869
                
870
            }
871
        }
872

    
873
        //Download a small file with a single GET operation
874
        private async Task DownloadEntireFileAsync(AccountInfo accountInfo, CloudFilesClient client, ObjectInfo cloudFile, Uri relativeUrl, string filePath,TreeHash serverHash)
875
        {
876
            if (client == null)
877
                throw new ArgumentNullException("client");
878
            if (cloudFile==null)
879
                throw new ArgumentNullException("cloudFile");
880
            if (relativeUrl == null)
881
                throw new ArgumentNullException("relativeUrl");
882
            if (String.IsNullOrWhiteSpace(filePath))
883
                throw new ArgumentNullException("filePath");
884
            if (!Path.IsPathRooted(filePath))
885
                throw new ArgumentException("The localPath must be rooted", "filePath");
886
            Contract.EndContractBlock();
887

    
888
            var localPath = Pithos.Interfaces.FileInfoExtensions.GetProperFilePathCapitalization(filePath);
889
            //If the file already exists
890
            if (File.Exists(localPath))
891
            {
892
                //First check with MD5 as this is a small file
893
                var localMD5 = Signature.CalculateMD5(localPath);
894
                var cloudHash=serverHash.TopHash.ToHashString();
895
                if (localMD5==cloudHash)
896
                    return;
897
                //Then check with a treehash
898
                var localTreeHash = Signature.CalculateTreeHash(localPath, serverHash.BlockSize, serverHash.BlockHash);
899
                var localHash = localTreeHash.TopHash.ToHashString();
900
                if (localHash==cloudHash)
901
                    return;
902
            }
903

    
904
            var fileAgent = GetFileAgent(accountInfo);
905
            //Calculate the relative file path for the new file
906
            var relativePath = relativeUrl.RelativeUriToFilePath();
907
            //The file will be stored in a temporary location while downloading with an extension .download
908
            var tempPath = Path.Combine(fileAgent.CachePath, relativePath + ".download");
909
            //Make sure the target folder exists. DownloadFileTask will not create the folder
910
            var tempFolder = Path.GetDirectoryName(tempPath);
911
            if (!Directory.Exists(tempFolder))
912
                Directory.CreateDirectory(tempFolder);
913

    
914
            //Download the object to the temporary location
915
            await client.GetObject(cloudFile.Account, cloudFile.Container, relativeUrl.ToString(), tempPath);
916

    
917
            //Create the local folder if it doesn't exist (necessary for shared objects)
918
            var localFolder = Path.GetDirectoryName(localPath);
919
            if (!Directory.Exists(localFolder))
920
                Directory.CreateDirectory(localFolder);            
921
            //And move it to its actual location once downloading is finished
922
            if (File.Exists(localPath))
923
                File.Replace(tempPath,localPath,null,true);
924
            else
925
                File.Move(tempPath,localPath);
926
            //Notify listeners that a local file has changed
927
            StatusNotification.NotifyChangedFile(localPath);
928

    
929
                       
930
        }
931

    
932
        //Download a file asynchronously using blocks
933
        public async Task DownloadWithBlocks(AccountInfo accountInfo, CloudFilesClient client, ObjectInfo cloudFile, Uri relativeUrl, string filePath, TreeHash serverHash)
934
        {
935
            if (client == null)
936
                throw new ArgumentNullException("client");
937
            if (cloudFile == null)
938
                throw new ArgumentNullException("cloudFile");
939
            if (relativeUrl == null)
940
                throw new ArgumentNullException("relativeUrl");
941
            if (String.IsNullOrWhiteSpace(filePath))
942
                throw new ArgumentNullException("filePath");
943
            if (!Path.IsPathRooted(filePath))
944
                throw new ArgumentException("The filePath must be rooted", "filePath");
945
            if (serverHash == null)
946
                throw new ArgumentNullException("serverHash");
947
            Contract.EndContractBlock();
948
            
949
           var fileAgent = GetFileAgent(accountInfo);
950
            var localPath = Interfaces.FileInfoExtensions.GetProperFilePathCapitalization(filePath);
951
            
952
            //Calculate the relative file path for the new file
953
            var relativePath = relativeUrl.RelativeUriToFilePath();
954
            var blockUpdater = new BlockUpdater(fileAgent.CachePath, localPath, relativePath, serverHash);
955

    
956
            
957
                        
958
            //Calculate the file's treehash
959
            var treeHash = await Signature.CalculateTreeHashAsync(localPath, serverHash.BlockSize, serverHash.BlockHash);
960
                
961
            //And compare it with the server's hash
962
            var upHashes = serverHash.GetHashesAsStrings();
963
            var localHashes = treeHash.HashDictionary;
964
            for (int i = 0; i < upHashes.Length; i++)
965
            {
966
                //For every non-matching hash
967
                var upHash = upHashes[i];
968
                if (!localHashes.ContainsKey(upHash))
969
                {
970
                    if (blockUpdater.UseOrphan(i, upHash))
971
                    {
972
                        Log.InfoFormat("[BLOCK GET] ORPHAN FOUND for {0} of {1} for {2}", i, upHashes.Length, localPath);
973
                        continue;
974
                    }
975
                    Log.InfoFormat("[BLOCK GET] START {0} of {1} for {2}", i, upHashes.Length, localPath);
976
                    var start = i*serverHash.BlockSize;
977
                    //To download the last block just pass a null for the end of the range
978
                    long? end = null;
979
                    if (i < upHashes.Length - 1 )
980
                        end= ((i + 1)*serverHash.BlockSize) ;
981
                            
982
                    //Download the missing block
983
                    var block = await client.GetBlock(cloudFile.Account, cloudFile.Container, relativeUrl, start, end);
984

    
985
                    //and store it
986
                    blockUpdater.StoreBlock(i, block);
987

    
988

    
989
                    Log.InfoFormat("[BLOCK GET] FINISH {0} of {1} for {2}", i, upHashes.Length, localPath);
990
                }
991
            }
992

    
993
            //Want to avoid notifications if no changes were made
994
            var hasChanges = blockUpdater.HasBlocks;
995
            blockUpdater.Commit();
996
            
997
            if (hasChanges)
998
                //Notify listeners that a local file has changed
999
                StatusNotification.NotifyChangedFile(localPath);
1000

    
1001
            Log.InfoFormat("[BLOCK GET] COMPLETE {0}", localPath);            
1002
        }
1003

    
1004

    
1005
        private async Task UploadCloudFile(CloudAction action)
1006
        {
1007
            if (action == null)
1008
                throw new ArgumentNullException("action");           
1009
            Contract.EndContractBlock();
1010

    
1011
            try
1012
            {
1013
                var accountInfo = action.AccountInfo;
1014

    
1015
                var fileInfo = action.LocalFile;
1016

    
1017
                if (fileInfo.Extension.Equals("ignore", StringComparison.InvariantCultureIgnoreCase))
1018
                    return;
1019
                
1020
                var relativePath = fileInfo.AsRelativeTo(accountInfo.AccountPath);
1021
                if (relativePath.StartsWith(FolderConstants.OthersFolder))
1022
                {
1023
                    var parts = relativePath.Split('\\');
1024
                    var accountName = parts[1];
1025
                    var oldName = accountInfo.UserName;
1026
                    var absoluteUri = accountInfo.StorageUri.AbsoluteUri;
1027
                    var nameIndex = absoluteUri.IndexOf(oldName);
1028
                    var root = absoluteUri.Substring(0, nameIndex);
1029

    
1030
                    accountInfo = new AccountInfo
1031
                    {
1032
                        UserName = accountName,
1033
                        AccountPath = Path.Combine(accountInfo.AccountPath, parts[0], parts[1]),
1034
                        StorageUri = new Uri(root + accountName),
1035
                        BlockHash = accountInfo.BlockHash,
1036
                        BlockSize = accountInfo.BlockSize,
1037
                        Token = accountInfo.Token
1038
                    };
1039
                }
1040

    
1041

    
1042
                var fullFileName = fileInfo.GetProperCapitalization();
1043
                using (var gate = NetworkGate.Acquire(fullFileName, NetworkOperation.Uploading))
1044
                {
1045
                    //Abort if the file is already being uploaded or downloaded
1046
                    if (gate.Failed)
1047
                        return;
1048

    
1049
                    var cloudFile = action.CloudFile;
1050
                    var account = cloudFile.Account ?? accountInfo.UserName;
1051

    
1052
                    var client = new CloudFilesClient(accountInfo);                    
1053
                    //Even if GetObjectInfo times out, we can proceed with the upload            
1054
                    var info = client.GetObjectInfo(account, cloudFile.Container, cloudFile.Name);
1055

    
1056
                    //If this is a read-only file, do not upload changes
1057
                    if (info.AllowedTo == "read")
1058
                        return;
1059
                    
1060
                    //TODO: Check how a directory hash is calculated -> All dirs seem to have the same hash
1061
                    if (fileInfo is DirectoryInfo)
1062
                    {
1063
                        //If the directory doesn't exist the Hash property will be empty
1064
                        if (String.IsNullOrWhiteSpace(info.Hash))
1065
                            //Go on and create the directory
1066
                            await client.PutObject(account, cloudFile.Container, cloudFile.Name, fullFileName, String.Empty, "application/directory");
1067
                    }
1068
                    else
1069
                    {
1070

    
1071
                        var cloudHash = info.Hash.ToLower();
1072

    
1073
                        var hash = action.LocalHash.Value;
1074
                        var topHash = action.TopHash.Value;
1075

    
1076
                        //If the file hashes match, abort the upload
1077
                        if (hash == cloudHash || topHash == cloudHash)
1078
                        {
1079
                            //but store any metadata changes 
1080
                            StatusKeeper.StoreInfo(fullFileName, info);
1081
                            Log.InfoFormat("Skip upload of {0}, hashes match", fullFileName);
1082
                            return;
1083
                        }
1084

    
1085

    
1086
                        //Mark the file as modified while we upload it
1087
                        StatusKeeper.SetFileOverlayStatus(fullFileName, FileOverlayStatus.Modified);
1088
                        //And then upload it
1089

    
1090
                        //Upload even small files using the Hashmap. The server may already contain
1091
                        //the relevant block
1092

    
1093
                        //First, calculate the tree hash
1094
                        var treeHash = await Signature.CalculateTreeHashAsync(fullFileName, accountInfo.BlockSize,
1095
                                                                              accountInfo.BlockHash);
1096

    
1097
                        await UploadWithHashMap(accountInfo, cloudFile, fileInfo as FileInfo, cloudFile.Name, treeHash);
1098
                    }
1099
                    //If everything succeeds, change the file and overlay status to normal
1100
                    StatusKeeper.SetFileState(fullFileName, FileStatus.Unchanged, FileOverlayStatus.Normal);
1101
                }
1102
                //Notify the Shell to update the overlays
1103
                NativeMethods.RaiseChangeNotification(fullFileName);
1104
                StatusNotification.NotifyChangedFile(fullFileName);
1105
            }
1106
            catch (AggregateException ex)
1107
            {
1108
                var exc = ex.InnerException as WebException;
1109
                if (exc == null)
1110
                    throw ex.InnerException;
1111
                if (HandleUploadWebException(action, exc)) 
1112
                    return;
1113
                throw;
1114
            }
1115
            catch (WebException ex)
1116
            {
1117
                if (HandleUploadWebException(action, ex))
1118
                    return;
1119
                throw;
1120
            }
1121
            catch (Exception ex)
1122
            {
1123
                Log.Error("Unexpected error while uploading file", ex);
1124
                throw;
1125
            }
1126

    
1127
        }
1128

    
1129
        private bool IsDeletedFile(CloudAction action)
1130
        {            
1131
            var key = GetFileKey(action.CloudFile);
1132
            DateTime entryDate;
1133
            if (_deletedFiles.TryGetValue(key, out entryDate))
1134
            {
1135
                //If the delete entry was created after this action, abort the action
1136
                if (entryDate > action.Created)
1137
                    return true;
1138
                //Otherwise, remove the stale entry 
1139
                _deletedFiles.TryRemove(key, out entryDate);
1140
            }
1141
            return false;
1142
        }
1143

    
1144
        private bool HandleUploadWebException(CloudAction action, WebException exc)
1145
        {
1146
            var response = exc.Response as HttpWebResponse;
1147
            if (response == null)
1148
                throw exc;
1149
            if (response.StatusCode == HttpStatusCode.Unauthorized)
1150
            {
1151
                Log.Error("Not allowed to upload file", exc);
1152
                var message = String.Format("Not allowed to uplad file {0}", action.LocalFile.FullName);
1153
                StatusKeeper.SetFileState(action.LocalFile.FullName, FileStatus.Unchanged, FileOverlayStatus.Normal);
1154
                StatusNotification.NotifyChange(message, TraceLevel.Warning);
1155
                return true;
1156
            }
1157
            return false;
1158
        }
1159

    
1160
        public async Task UploadWithHashMap(AccountInfo accountInfo,ObjectInfo cloudFile,FileInfo fileInfo,string url,TreeHash treeHash)
1161
        {
1162
            if (accountInfo == null)
1163
                throw new ArgumentNullException("accountInfo");
1164
            if (cloudFile==null)
1165
                throw new ArgumentNullException("cloudFile");
1166
            if (fileInfo == null)
1167
                throw new ArgumentNullException("fileInfo");
1168
            if (String.IsNullOrWhiteSpace(url))
1169
                throw new ArgumentNullException(url);
1170
            if (treeHash==null)
1171
                throw new ArgumentNullException("treeHash");
1172
            if (String.IsNullOrWhiteSpace(cloudFile.Container) )
1173
                throw new ArgumentException("Invalid container","cloudFile");
1174
            Contract.EndContractBlock();
1175

    
1176
            var fullFileName = fileInfo.GetProperCapitalization();
1177

    
1178
            var account = cloudFile.Account ?? accountInfo.UserName;
1179
            var container = cloudFile.Container ;
1180

    
1181
            var client = new CloudFilesClient(accountInfo);
1182
            //Send the hashmap to the server            
1183
            var missingHashes =  await client.PutHashMap(account, container, url, treeHash);
1184
            //If the server returns no missing hashes, we are done
1185
            while (missingHashes.Count > 0)
1186
            {
1187

    
1188
                var buffer = new byte[accountInfo.BlockSize];
1189
                foreach (var missingHash in missingHashes)
1190
                {
1191
                    //Find the proper block
1192
                    var blockIndex = treeHash.HashDictionary[missingHash];
1193
                    var offset = blockIndex*accountInfo.BlockSize;
1194

    
1195
                    var read = fileInfo.Read(buffer, offset, accountInfo.BlockSize);
1196

    
1197
                    try
1198
                    {
1199
                        //And upload the block                
1200
                        await client.PostBlock(account, container, buffer, 0, read);
1201
                        Log.InfoFormat("[BLOCK] Block {0} of {1} uploaded", blockIndex, fullFileName);
1202
                    }
1203
                    catch (Exception exc)
1204
                    {
1205
                        Log.ErrorFormat("[ERROR] uploading block {0} of {1}\n{2}", blockIndex, fullFileName, exc);
1206
                    }
1207

    
1208
                }
1209

    
1210
                //Repeat until there are no more missing hashes                
1211
                missingHashes = await client.PutHashMap(account, container, url, treeHash);
1212
            }
1213
        }
1214

    
1215

    
1216
        public void AddAccount(AccountInfo accountInfo)
1217
        {            
1218
            if (!_accounts.Contains(accountInfo))
1219
                _accounts.Add(accountInfo);
1220
        }
1221
    }
1222

    
1223
   
1224

    
1225

    
1226
}