root / trunk / Pithos.Core / Agents / PollAgent.cs @ 4b58c004
History | View | Annotate | Download (54.3 kB)
1 |
#region |
---|---|
2 |
/* ----------------------------------------------------------------------- |
3 |
* <copyright file="PollAgent.cs" company="GRNet"> |
4 |
* |
5 |
* Copyright 2011-2012 GRNET S.A. All rights reserved. |
6 |
* |
7 |
* Redistribution and use in source and binary forms, with or |
8 |
* without modification, are permitted provided that the following |
9 |
* conditions are met: |
10 |
* |
11 |
* 1. Redistributions of source code must retain the above |
12 |
* copyright notice, this list of conditions and the following |
13 |
* disclaimer. |
14 |
* |
15 |
* 2. Redistributions in binary form must reproduce the above |
16 |
* copyright notice, this list of conditions and the following |
17 |
* disclaimer in the documentation and/or other materials |
18 |
* provided with the distribution. |
19 |
* |
20 |
* |
21 |
* THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS |
22 |
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
23 |
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
24 |
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR |
25 |
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
26 |
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
27 |
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
28 |
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
29 |
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
30 |
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
31 |
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
32 |
* POSSIBILITY OF SUCH DAMAGE. |
33 |
* |
34 |
* The views and conclusions contained in the software and |
35 |
* documentation are those of the authors and should not be |
36 |
* interpreted as representing official policies, either expressed |
37 |
* or implied, of GRNET S.A. |
38 |
* </copyright> |
39 |
* ----------------------------------------------------------------------- |
40 |
*/ |
41 |
#endregion |
42 |
|
43 |
using System.Collections.Concurrent; |
44 |
using System.ComponentModel.Composition; |
45 |
using System.Diagnostics; |
46 |
using System.Diagnostics.Contracts; |
47 |
using System.IO; |
48 |
using System.Linq.Expressions; |
49 |
using System.Reflection; |
50 |
using System.Security.Cryptography; |
51 |
using System.Threading; |
52 |
using System.Threading.Tasks; |
53 |
using System.Threading.Tasks.Dataflow; |
54 |
using Castle.ActiveRecord; |
55 |
using Pithos.Interfaces; |
56 |
using Pithos.Network; |
57 |
using log4net; |
58 |
|
59 |
namespace Pithos.Core.Agents |
60 |
{ |
61 |
using System; |
62 |
using System.Collections.Generic; |
63 |
using System.Linq; |
64 |
|
65 |
public class PollRequest |
66 |
{ |
67 |
public DateTime? Since { get; set; } |
68 |
public IEnumerable<string> Batch { get; set; } |
69 |
} |
70 |
|
71 |
[DebuggerDisplay("{FilePath} C:{C} L:{L} S:{S}")] |
72 |
public class StateTuple |
73 |
{ |
74 |
public string FilePath { get; private set; } |
75 |
|
76 |
public string MD5 { get; set; } |
77 |
|
78 |
public string L |
79 |
{ |
80 |
get { return FileState==null?null:FileState.Checksum; } |
81 |
} |
82 |
|
83 |
private string _c; |
84 |
public string C |
85 |
{ |
86 |
get { return _c; } |
87 |
set { |
88 |
_c = String.IsNullOrWhiteSpace(value) ? null : value; |
89 |
} |
90 |
} |
91 |
|
92 |
public string S |
93 |
{ |
94 |
get { return ObjectInfo == null ? null : ObjectInfo.X_Object_Hash; } |
95 |
} |
96 |
|
97 |
private FileSystemInfo _fileInfo; |
98 |
private TreeHash _merkle; |
99 |
|
100 |
public FileSystemInfo FileInfo |
101 |
{ |
102 |
get { return _fileInfo; } |
103 |
set |
104 |
{ |
105 |
_fileInfo = value; |
106 |
FilePath = value.FullName; |
107 |
} |
108 |
} |
109 |
|
110 |
public FileState FileState { get; set; } |
111 |
public ObjectInfo ObjectInfo{ get; set; } |
112 |
|
113 |
|
114 |
public TreeHash Merkle |
115 |
{ |
116 |
get { |
117 |
return _merkle; |
118 |
} |
119 |
set { |
120 |
_merkle = value; |
121 |
C = _merkle.TopHash.ToHashString(); |
122 |
} |
123 |
} |
124 |
|
125 |
public StateTuple() { } |
126 |
|
127 |
public StateTuple(FileSystemInfo info) |
128 |
{ |
129 |
FileInfo = info; |
130 |
} |
131 |
|
132 |
|
133 |
} |
134 |
|
135 |
|
136 |
/// <summary> |
137 |
/// PollAgent periodically polls the server to detect object changes. The agent retrieves a listing of all |
138 |
/// objects and compares it with a previously cached version to detect differences. |
139 |
/// New files are downloaded, missing files are deleted from the local file system and common files are compared |
140 |
/// to determine the appropriate action |
141 |
/// </summary> |
142 |
[Export] |
143 |
public class PollAgent |
144 |
{ |
145 |
private static readonly ILog Log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType); |
146 |
|
147 |
[System.ComponentModel.Composition.Import] |
148 |
public IStatusKeeper StatusKeeper { get; set; } |
149 |
|
150 |
[System.ComponentModel.Composition.Import] |
151 |
public IPithosSettings Settings { get; set; } |
152 |
|
153 |
[System.ComponentModel.Composition.Import] |
154 |
public NetworkAgent NetworkAgent { get; set; } |
155 |
|
156 |
[System.ComponentModel.Composition.Import] |
157 |
public Selectives Selectives { get; set; } |
158 |
|
159 |
public IStatusNotification StatusNotification { get; set; } |
160 |
|
161 |
private CancellationTokenSource _currentOperationCancellation = new CancellationTokenSource(); |
162 |
|
163 |
public void CancelCurrentOperation() |
164 |
{ |
165 |
//What does it mean to cancel the current upload/download? |
166 |
//Obviously, the current operation will be cancelled by throwing |
167 |
//a cancellation exception. |
168 |
// |
169 |
//The default behavior is to retry any operations that throw. |
170 |
//Obviously this is not what we want in this situation. |
171 |
//The cancelled operation should NOT bea retried. |
172 |
// |
173 |
//This can be done by catching the cancellation exception |
174 |
//and avoiding the retry. |
175 |
// |
176 |
|
177 |
//Have to reset the cancellation source - it is not possible to reset the source |
178 |
//Have to prevent a case where an operation requests a token from the old source |
179 |
var oldSource = Interlocked.Exchange(ref _currentOperationCancellation, new CancellationTokenSource()); |
180 |
oldSource.Cancel(); |
181 |
|
182 |
} |
183 |
|
184 |
public bool Pause |
185 |
{ |
186 |
get { |
187 |
return _pause; |
188 |
} |
189 |
set { |
190 |
_pause = value; |
191 |
if (!_pause) |
192 |
_unPauseEvent.Set(); |
193 |
else |
194 |
{ |
195 |
_unPauseEvent.Reset(); |
196 |
} |
197 |
} |
198 |
} |
199 |
|
200 |
private bool _firstPoll = true; |
201 |
|
202 |
//The Sync Event signals a manual synchronisation |
203 |
private readonly AsyncManualResetEvent _syncEvent = new AsyncManualResetEvent(); |
204 |
|
205 |
private readonly AsyncManualResetEvent _unPauseEvent = new AsyncManualResetEvent(true); |
206 |
|
207 |
private readonly ConcurrentDictionary<string, DateTime> _lastSeen = new ConcurrentDictionary<string, DateTime>(); |
208 |
private readonly ConcurrentDictionary<Uri, AccountInfo> _accounts = new ConcurrentDictionary<Uri,AccountInfo>(); |
209 |
|
210 |
//private readonly ActionBlock<PollRequest> _pollAction; |
211 |
|
212 |
public PollAgent() |
213 |
{ |
214 |
//_pollAction=new ActionBlock<PollRequest>(p=>ProcessPollRequest(p)); |
215 |
} |
216 |
|
217 |
|
218 |
/*private void ProcessPollRequest(PollRequest request) |
219 |
{ |
220 |
|
221 |
if (request.Since == null && request.Batch != null) |
222 |
{ |
223 |
_batchQueue.Enqueue(request.Batch); |
224 |
_syncEvent.Set(); |
225 |
} |
226 |
else |
227 |
{ |
228 |
PollRemoteFiles(request.Since).Wait(); |
229 |
} |
230 |
}*/ |
231 |
/// <summary> |
232 |
/// Start a manual synchronization |
233 |
/// </summary> |
234 |
public void SynchNow(IEnumerable<string> paths=null) |
235 |
{ |
236 |
_batchQueue.Enqueue(paths); |
237 |
_syncEvent.Set(); |
238 |
|
239 |
//_pollAction.Post(new PollRequest {Batch = paths}); |
240 |
} |
241 |
|
242 |
readonly ConcurrentQueue<IEnumerable<string>> _batchQueue=new ConcurrentQueue<IEnumerable<string>>(); |
243 |
|
244 |
/// <summary> |
245 |
/// Remote files are polled periodically. Any changes are processed |
246 |
/// </summary> |
247 |
/// <param name="since"></param> |
248 |
/// <returns></returns> |
249 |
public void PollRemoteFiles(DateTime? since = null) |
250 |
{ |
251 |
if (Log.IsDebugEnabled) |
252 |
Log.DebugFormat("Polling changes after [{0}]",since); |
253 |
|
254 |
Debug.Assert(Thread.CurrentThread.IsBackground, "Polling Ended up in the main thread!"); |
255 |
|
256 |
//GC.Collect(); |
257 |
|
258 |
using (ThreadContext.Stacks["Retrieve Remote"].Push("All accounts")) |
259 |
{ |
260 |
//If this poll fails, we will retry with the same since value |
261 |
var nextSince = since; |
262 |
try |
263 |
{ |
264 |
_unPauseEvent.Wait(); |
265 |
UpdateStatus(PithosStatus.PollSyncing); |
266 |
|
267 |
var accountBatches=new Dictionary<Uri, IEnumerable<string>>(); |
268 |
IEnumerable<string> batch = null; |
269 |
if (_batchQueue.TryDequeue(out batch) && batch != null) |
270 |
foreach (var account in _accounts.Values) |
271 |
{ |
272 |
var accountBatch = batch.Where(path => path.IsAtOrBelow(account.AccountPath)); |
273 |
accountBatches[account.AccountKey] = accountBatch; |
274 |
} |
275 |
|
276 |
|
277 |
IEnumerable<Task<DateTime?>> tasks = new List<Task<DateTime?>>(); |
278 |
foreach(var accountInfo in _accounts.Values) |
279 |
{ |
280 |
IEnumerable<string> accountBatch ; |
281 |
accountBatches.TryGetValue(accountInfo.AccountKey,out accountBatch); |
282 |
ProcessAccountFiles (accountInfo, accountBatch, since).Wait(); |
283 |
} |
284 |
|
285 |
var nextTimes=TaskEx.WhenAll(tasks.ToList()).Result; |
286 |
|
287 |
_firstPoll = false; |
288 |
//Reschedule the poll with the current timestamp as a "since" value |
289 |
|
290 |
if (nextTimes.Length>0) |
291 |
nextSince = nextTimes.Min(); |
292 |
if (Log.IsDebugEnabled) |
293 |
Log.DebugFormat("Next Poll at [{0}]",nextSince); |
294 |
} |
295 |
catch (Exception ex) |
296 |
{ |
297 |
Log.ErrorFormat("Error while processing accounts\r\n{0}", ex); |
298 |
//In case of failure retry with the same "since" value |
299 |
} |
300 |
|
301 |
UpdateStatus(PithosStatus.PollComplete); |
302 |
//The multiple try blocks are required because we can't have an await call |
303 |
//inside a finally block |
304 |
//TODO: Find a more elegant solution for reschedulling in the event of an exception |
305 |
try |
306 |
{ |
307 |
//Wait for the polling interval to pass or the Sync event to be signalled |
308 |
nextSince = WaitForScheduledOrManualPoll(nextSince).Result; |
309 |
} |
310 |
finally |
311 |
{ |
312 |
//Ensure polling is scheduled even in case of error |
313 |
PollRemoteFiles(nextSince); |
314 |
//_pollAction.Post(new PollRequest {Since = nextSince}); |
315 |
} |
316 |
} |
317 |
} |
318 |
|
319 |
/// <summary> |
320 |
/// Wait for the polling period to expire or a manual sync request |
321 |
/// </summary> |
322 |
/// <param name="since"></param> |
323 |
/// <returns></returns> |
324 |
private async Task<DateTime?> WaitForScheduledOrManualPoll(DateTime? since) |
325 |
{ |
326 |
var sync = _syncEvent.WaitAsync(); |
327 |
var wait = TaskEx.Delay(TimeSpan.FromSeconds(Settings.PollingInterval)); |
328 |
|
329 |
var signaledTask = await TaskEx.WhenAny(sync, wait); |
330 |
|
331 |
//Pausing takes precedence over manual sync or awaiting |
332 |
_unPauseEvent.Wait(); |
333 |
|
334 |
//Wait for network processing to finish before polling |
335 |
var pauseTask=NetworkAgent.ProceedEvent.WaitAsync(); |
336 |
await TaskEx.WhenAll(signaledTask, pauseTask); |
337 |
|
338 |
//If polling is signalled by SynchNow, ignore the since tag |
339 |
if (sync.IsCompleted) |
340 |
{ |
341 |
//TODO: Must convert to AutoReset |
342 |
_syncEvent.Reset(); |
343 |
return null; |
344 |
} |
345 |
return since; |
346 |
} |
347 |
|
348 |
public async Task<DateTime?> ProcessAccountFiles(AccountInfo accountInfo, IEnumerable<string> accountBatch, DateTime? since = null) |
349 |
{ |
350 |
if (accountInfo == null) |
351 |
throw new ArgumentNullException("accountInfo"); |
352 |
if (String.IsNullOrWhiteSpace(accountInfo.AccountPath)) |
353 |
throw new ArgumentException("The AccountInfo.AccountPath is empty", "accountInfo"); |
354 |
Contract.EndContractBlock(); |
355 |
|
356 |
|
357 |
using (ThreadContext.Stacks["Retrieve Remote"].Push(accountInfo.UserName)) |
358 |
{ |
359 |
|
360 |
await NetworkAgent.GetDeleteAwaiter(); |
361 |
|
362 |
Log.Info("Scheduled"); |
363 |
var client = new CloudFilesClient(accountInfo); |
364 |
|
365 |
//We don't need to check the trash container |
366 |
var containers = client.ListContainers(accountInfo.UserName) |
367 |
.Where(c=>c.Name!="trash") |
368 |
.ToList(); |
369 |
|
370 |
|
371 |
CreateContainerFolders(accountInfo, containers); |
372 |
|
373 |
//The nextSince time fallback time is the same as the current. |
374 |
//If polling succeeds, the next Since time will be the smallest of the maximum modification times |
375 |
//of the shared and account objects |
376 |
var nextSince = since; |
377 |
|
378 |
try |
379 |
{ |
380 |
//Wait for any deletions to finish |
381 |
await NetworkAgent.GetDeleteAwaiter(); |
382 |
//Get the poll time now. We may miss some deletions but it's better to keep a file that was deleted |
383 |
//than delete a file that was created while we were executing the poll |
384 |
|
385 |
//Get the list of server objects changed since the last check |
386 |
//The name of the container is passed as state in order to create a dictionary of tasks in a subsequent step |
387 |
var listObjects = (from container in containers |
388 |
select Task<IList<ObjectInfo>>.Factory.StartNew(_ => |
389 |
client.ListObjects(accountInfo.UserName, container.Name, since), container.Name)).ToList(); |
390 |
|
391 |
var listShared = Task<IList<ObjectInfo>>.Factory.StartNew(_ => |
392 |
client.ListSharedObjects(since), "shared"); |
393 |
listObjects.Add(listShared); |
394 |
var listTasks = await Task.Factory.WhenAll(listObjects.ToArray()); |
395 |
|
396 |
using (ThreadContext.Stacks["SCHEDULE"].Push("Process Results")) |
397 |
{ |
398 |
var dict = listTasks.ToDictionary(t => t.AsyncState); |
399 |
|
400 |
//Get all non-trash objects. Remember, the container name is stored in AsyncState |
401 |
var remoteObjects = (from objectList in listTasks |
402 |
where (string)objectList.AsyncState != "trash" |
403 |
from obj in objectList.Result |
404 |
orderby obj.Bytes ascending |
405 |
select obj).ToList(); |
406 |
|
407 |
//Get the latest remote object modification date, only if it is after |
408 |
//the original since date |
409 |
nextSince = GetLatestDateAfter(nextSince, remoteObjects); |
410 |
|
411 |
var sharedObjects = dict["shared"].Result; |
412 |
nextSince = GetLatestDateBefore(nextSince, sharedObjects); |
413 |
|
414 |
//DON'T process trashed files |
415 |
//If some files are deleted and added again to a folder, they will be deleted |
416 |
//even though they are new. |
417 |
//We would have to check file dates and hashes to ensure that a trashed file |
418 |
//can be deleted safely from the local hard drive. |
419 |
/* |
420 |
//Items with the same name, hash may be both in the container and the trash |
421 |
//Don't delete items that exist in the container |
422 |
var realTrash = from trash in trashObjects |
423 |
where |
424 |
!remoteObjects.Any( |
425 |
info => info.Name == trash.Name && info.Hash == trash.Hash) |
426 |
8 select trash; |
427 |
ProcessTrashedFiles(accountInfo, realTrash); |
428 |
*/ |
429 |
|
430 |
var cleanRemotes = (from info in remoteObjects.Union(sharedObjects) |
431 |
let name = info.Name??"" |
432 |
where !name.EndsWith(".ignore", StringComparison.InvariantCultureIgnoreCase) && |
433 |
!name.StartsWith(FolderConstants.CacheFolder + "/", |
434 |
StringComparison.InvariantCultureIgnoreCase) |
435 |
select info).ToList(); |
436 |
|
437 |
if (_firstPoll) |
438 |
StatusKeeper.CleanupOrphanStates(); |
439 |
StatusKeeper.CleanupStaleStates(accountInfo, cleanRemotes); |
440 |
|
441 |
//var differencer = _differencer.PostSnapshot(accountInfo, cleanRemotes); |
442 |
|
443 |
//var filterUris = Selectives.SelectiveUris[accountInfo.AccountKey]; |
444 |
|
445 |
//May have to wait if the FileAgent has asked for a Pause, due to local changes |
446 |
await _unPauseEvent.WaitAsync(); |
447 |
|
448 |
//Get the local files here |
449 |
var agent = AgentLocator<FileAgent>.Get(accountInfo.AccountPath); |
450 |
//TODO: Pass the batch here as well |
451 |
var files = await LoadLocalFileTuples(accountInfo, accountBatch); |
452 |
|
453 |
var states = FileState.Queryable.ToList(); |
454 |
|
455 |
var infos = (from remote in cleanRemotes |
456 |
let path = remote.RelativeUrlToFilePath(accountInfo.UserName) |
457 |
let info=agent.GetFileSystemInfo(path) |
458 |
select Tuple.Create(info.FullName,remote)) |
459 |
.ToList(); |
460 |
|
461 |
var token = _currentOperationCancellation.Token; |
462 |
|
463 |
var tuples = MergeSources(infos, files, states).ToList(); |
464 |
|
465 |
//Process only the changes in the batch file, if one exists |
466 |
var stateTuples = accountBatch==null?tuples:tuples.Where(t => accountBatch.Contains(t.FilePath)); |
467 |
foreach (var tuple in stateTuples) |
468 |
{ |
469 |
await _unPauseEvent.WaitAsync(); |
470 |
|
471 |
//Set the Merkle Hash |
472 |
SetMerkleHash(accountInfo, tuple); |
473 |
|
474 |
SyncSingleItem(accountInfo, tuple, agent, token); |
475 |
|
476 |
} |
477 |
|
478 |
|
479 |
//On the first run |
480 |
/* |
481 |
if (_firstPoll) |
482 |
{ |
483 |
MarkSuspectedDeletes(accountInfo, cleanRemotes); |
484 |
} |
485 |
*/ |
486 |
|
487 |
|
488 |
Log.Info("[LISTENER] End Processing"); |
489 |
} |
490 |
} |
491 |
catch (Exception ex) |
492 |
{ |
493 |
Log.ErrorFormat("[FAIL] ListObjects for{0} in ProcessRemoteFiles with {1}", accountInfo.UserName, ex); |
494 |
return nextSince; |
495 |
} |
496 |
|
497 |
Log.Info("[LISTENER] Finished"); |
498 |
return nextSince; |
499 |
} |
500 |
} |
501 |
|
502 |
private static void SetMerkleHash(AccountInfo accountInfo, StateTuple tuple) |
503 |
{ |
504 |
//The Merkle hash for directories is that of an empty buffer |
505 |
if (tuple.FileInfo is DirectoryInfo) |
506 |
tuple.C = MERKLE_EMPTY; |
507 |
else if (tuple.FileState != null && tuple.MD5 == tuple.FileState.ShortHash) |
508 |
{ |
509 |
//If there is a state whose MD5 matches, load the merkle hash from the file state |
510 |
//insteaf of calculating it |
511 |
tuple.C = tuple.FileState.Checksum; |
512 |
} |
513 |
else |
514 |
{ |
515 |
tuple.Merkle = TaskEx.Run(()=> Signature.CalculateTreeHash(tuple.FileInfo, accountInfo.BlockSize, accountInfo.BlockHash)).Result; |
516 |
//tuple.C=tuple.Merkle.TopHash.ToHashString(); |
517 |
} |
518 |
} |
519 |
|
520 |
private async Task<List<Tuple<FileSystemInfo, string>>> LoadLocalFileTuples(AccountInfo accountInfo,IEnumerable<string> batch ) |
521 |
{ |
522 |
using (ThreadContext.Stacks["Account Files Hashing"].Push(accountInfo.UserName)) |
523 |
{ |
524 |
var batchPaths = (batch==null)?new List<string>():batch.ToList(); |
525 |
IEnumerable<FileSystemInfo> localInfos=AgentLocator<FileAgent>.Get(accountInfo.AccountPath) |
526 |
.EnumerateFileSystemInfos(); |
527 |
if (batchPaths.Count>0) |
528 |
localInfos= localInfos.Where(fi => batchPaths.Contains(fi.FullName)); |
529 |
|
530 |
//Use the queue to retry locked file hashing |
531 |
var fileQueue = new Queue<FileSystemInfo>(localInfos); |
532 |
var hasher = MD5.Create(); |
533 |
|
534 |
var results = new List<Tuple<FileSystemInfo, string>>(); |
535 |
var backoff = 0; |
536 |
while (fileQueue.Count > 0) |
537 |
{ |
538 |
var file = fileQueue.Dequeue(); |
539 |
using (ThreadContext.Stacks["File"].Push(file.FullName)) |
540 |
{ |
541 |
/* |
542 |
Signature.CalculateTreeHash(file, accountInfo.BlockSize, |
543 |
accountInfo.BlockHash). |
544 |
TopHash.ToHashString() |
545 |
*/ |
546 |
try |
547 |
{ |
548 |
//Replace MD5 here, do the calc while syncing individual files |
549 |
string hash ; |
550 |
if (file is DirectoryInfo) |
551 |
hash = MERKLE_EMPTY; |
552 |
else |
553 |
{ |
554 |
//Wait in case the FileAgent has requested a Pause |
555 |
await _unPauseEvent.WaitAsync(); |
556 |
|
557 |
using (StatusNotification.GetNotifier("Hashing {0}", "Finished hashing {0}", file.Name)) |
558 |
using (var stream = (file as FileInfo).OpenRead()) |
559 |
{ |
560 |
hash = hasher.ComputeHash(stream).ToHashString(); |
561 |
backoff = 0; |
562 |
} |
563 |
} |
564 |
results.Add(Tuple.Create(file, hash)); |
565 |
} |
566 |
catch (IOException exc) |
567 |
{ |
568 |
Log.WarnFormat("[HASH] File in use, will retry [{0}]", exc); |
569 |
fileQueue.Enqueue(file); |
570 |
//If this is the only enqueued file |
571 |
if (fileQueue.Count != 1) continue; |
572 |
|
573 |
|
574 |
//Increase delay |
575 |
if (backoff<60000) |
576 |
backoff += 10000; |
577 |
//Pause Polling for the specified time |
578 |
} |
579 |
if (backoff>0) |
580 |
await PauseFor(backoff); |
581 |
} |
582 |
} |
583 |
|
584 |
return results; |
585 |
} |
586 |
} |
587 |
|
588 |
/// <summary> |
589 |
/// Wait and Pause the agent while waiting |
590 |
/// </summary> |
591 |
/// <param name="backoff"></param> |
592 |
/// <returns></returns> |
593 |
private async Task PauseFor(int backoff) |
594 |
{ |
595 |
|
596 |
Pause = true; |
597 |
await TaskEx.Delay(backoff); |
598 |
Pause = false; |
599 |
} |
600 |
|
601 |
private void SyncSingleItem(AccountInfo accountInfo, StateTuple tuple, FileAgent agent, CancellationToken token) |
602 |
{ |
603 |
Log.DebugFormat("Sync [{0}] C:[{1}] L:[{2}] S:[{3}]",tuple.FilePath,tuple.C,tuple.L,tuple.S); |
604 |
|
605 |
var localFilePath = tuple.FilePath; |
606 |
//Don't use the tuple info, it may have been deleted |
607 |
var localInfo = FileInfoExtensions.FromPath(localFilePath); |
608 |
|
609 |
|
610 |
var isUnselectedRootFolder = agent.IsUnselectedRootFolder(tuple.FilePath); |
611 |
|
612 |
//Unselected root folders that have not yet been uploaded should be uploaded and added to the |
613 |
//selective folders |
614 |
|
615 |
if (!Selectives.IsSelected(accountInfo, localFilePath) && !(isUnselectedRootFolder && tuple.ObjectInfo==null) ) |
616 |
return; |
617 |
|
618 |
// Local file unchanged? If both C and L are null, make sure it's because |
619 |
//both the file is missing and the state checksum is not missing |
620 |
if (tuple.C == tuple.L /*&& (localInfo.Exists || tuple.FileState == null)*/) |
621 |
{ |
622 |
//No local changes |
623 |
//Server unchanged? |
624 |
if (tuple.S == tuple.L) |
625 |
{ |
626 |
// No server changes |
627 |
//Has the file been renamed on the server? |
628 |
MoveForServerMove(accountInfo, tuple); |
629 |
} |
630 |
else |
631 |
{ |
632 |
//Different from server |
633 |
//Does the server file exist? |
634 |
if (tuple.S == null) |
635 |
{ |
636 |
//Server file doesn't exist |
637 |
//deleteObjectFromLocal() |
638 |
StatusKeeper.SetFileState(localFilePath, FileStatus.Deleted, |
639 |
FileOverlayStatus.Deleted, ""); |
640 |
agent.Delete(localFilePath); |
641 |
//updateRecord(Remove C, L) |
642 |
StatusKeeper.ClearFileStatus(localFilePath); |
643 |
} |
644 |
else |
645 |
{ |
646 |
//Server file exists |
647 |
//downloadServerObject() // Result: L = S |
648 |
//If the file has moved on the server, move it locally before downloading |
649 |
var targetPath = MoveForServerMove(accountInfo, tuple); |
650 |
|
651 |
StatusKeeper.SetFileState(targetPath, FileStatus.Modified, |
652 |
FileOverlayStatus.Modified, ""); |
653 |
NetworkAgent.Downloader.DownloadCloudFile(accountInfo, |
654 |
tuple.ObjectInfo, |
655 |
targetPath, tuple.Merkle, token).Wait(token); |
656 |
//updateRecord( L = S ) |
657 |
StatusKeeper.UpdateFileChecksum(targetPath, tuple.ObjectInfo.ETag, |
658 |
tuple.ObjectInfo.X_Object_Hash); |
659 |
|
660 |
StatusKeeper.StoreInfo(targetPath, tuple.ObjectInfo); |
661 |
|
662 |
/* |
663 |
StatusKeeper.SetFileState(targetPath, FileStatus.Unchanged, |
664 |
FileOverlayStatus.Normal, ""); |
665 |
*/ |
666 |
} |
667 |
} |
668 |
|
669 |
} |
670 |
else |
671 |
{ |
672 |
//Local changes found |
673 |
|
674 |
//Server unchanged? |
675 |
if (tuple.S == tuple.L) |
676 |
{ |
677 |
//The FileAgent selective sync checks for new root folder files |
678 |
if (!agent.Ignore(localFilePath)) |
679 |
{ |
680 |
if ((tuple.C == null || !localInfo.Exists) && tuple.ObjectInfo != null) |
681 |
{ |
682 |
//deleteObjectFromServer() |
683 |
DeleteCloudFile(accountInfo, tuple); |
684 |
//updateRecord( Remove L, S) |
685 |
} |
686 |
else |
687 |
{ |
688 |
//uploadLocalObject() // Result: S = C, L = S |
689 |
|
690 |
//Debug.Assert(tuple.FileState !=null); |
691 |
var action = new CloudUploadAction(accountInfo, localInfo, tuple.FileState, |
692 |
accountInfo.BlockSize, accountInfo.BlockHash, |
693 |
"Poll", isUnselectedRootFolder); |
694 |
NetworkAgent.Uploader.UploadCloudFile(action, tuple.Merkle, token).Wait(token); |
695 |
|
696 |
//updateRecord( S = C ) |
697 |
//State updated by the uploader |
698 |
|
699 |
if (isUnselectedRootFolder) |
700 |
{ |
701 |
ProcessChildren(accountInfo, tuple, agent, token); |
702 |
} |
703 |
} |
704 |
} |
705 |
} |
706 |
else |
707 |
{ |
708 |
if (tuple.C == tuple.S) |
709 |
{ |
710 |
// (Identical Changes) Result: L = S |
711 |
//doNothing() |
712 |
//Detect server moves |
713 |
var targetPath = MoveForServerMove(accountInfo, tuple); |
714 |
StatusKeeper.StoreInfo(targetPath, tuple.ObjectInfo); |
715 |
} |
716 |
else |
717 |
{ |
718 |
if ((tuple.C == null || !localInfo.Exists) && tuple.ObjectInfo != null) |
719 |
{ |
720 |
//deleteObjectFromServer() |
721 |
DeleteCloudFile(accountInfo, tuple); |
722 |
//updateRecord(Remove L, S) |
723 |
} |
724 |
//If both the local and server files are missing, the state is stale |
725 |
else if (!localInfo.Exists && (tuple.S == null || tuple.ObjectInfo == null)) |
726 |
{ |
727 |
StatusKeeper.ClearFileStatus(localInfo.FullName); |
728 |
} |
729 |
else |
730 |
{ |
731 |
ReportConflictForMismatch(localFilePath); |
732 |
//identifyAsConflict() // Manual action required |
733 |
} |
734 |
} |
735 |
} |
736 |
} |
737 |
} |
738 |
|
739 |
private string MoveForServerMove(AccountInfo accountInfo, StateTuple tuple) |
740 |
{ |
741 |
if (tuple.ObjectInfo == null) |
742 |
return null; |
743 |
var relativePath = tuple.ObjectInfo.RelativeUrlToFilePath(accountInfo.UserName); |
744 |
var serverPath = Path.Combine(accountInfo.AccountPath, relativePath); |
745 |
|
746 |
//Compare Case Insensitive |
747 |
if (String.Equals(tuple.FilePath ,serverPath,StringComparison.InvariantCultureIgnoreCase)) return serverPath; |
748 |
|
749 |
if (tuple.FileInfo.Exists) |
750 |
{ |
751 |
var fi = tuple.FileInfo as FileInfo; |
752 |
if (fi != null) |
753 |
fi.MoveTo(serverPath); |
754 |
var di = tuple.FileInfo as DirectoryInfo; |
755 |
if (di != null) |
756 |
di.MoveTo(serverPath); |
757 |
StatusKeeper.StoreInfo(serverPath, tuple.ObjectInfo); |
758 |
} |
759 |
else |
760 |
{ |
761 |
Debug.Assert(false, "File does not exist"); |
762 |
} |
763 |
return serverPath; |
764 |
} |
765 |
|
766 |
private void DeleteCloudFile(AccountInfo accountInfo, StateTuple tuple) |
767 |
{ |
768 |
StatusKeeper.SetFileState(tuple.FilePath, FileStatus.Deleted, |
769 |
FileOverlayStatus.Deleted, ""); |
770 |
NetworkAgent.DeleteAgent.DeleteCloudFile(accountInfo, tuple.ObjectInfo); |
771 |
StatusKeeper.ClearFileStatus(tuple.FilePath); |
772 |
} |
773 |
|
774 |
private void ProcessChildren(AccountInfo accountInfo, StateTuple tuple, FileAgent agent, CancellationToken token) |
775 |
{ |
776 |
|
777 |
var dirInfo = tuple.FileInfo as DirectoryInfo; |
778 |
var folderTuples = from folder in dirInfo.EnumerateDirectories("*", SearchOption.AllDirectories) |
779 |
select new StateTuple(folder); |
780 |
var fileTuples = from file in dirInfo.EnumerateFiles("*", SearchOption.AllDirectories) |
781 |
select new StateTuple(file); |
782 |
|
783 |
//Process folders first, to ensure folders appear on the sever as soon as possible |
784 |
folderTuples.ApplyAction(t => SyncSingleItem(accountInfo, t, agent, token)); |
785 |
|
786 |
fileTuples.ApplyAction(t => SyncSingleItem(accountInfo, t, agent, token)); |
787 |
} |
788 |
|
789 |
private static IEnumerable<StateTuple> MergeSources( |
790 |
IEnumerable<Tuple<string, ObjectInfo>> infos, |
791 |
IEnumerable<Tuple<FileSystemInfo, string>> files, |
792 |
IEnumerable<FileState> states) |
793 |
{ |
794 |
var tuplesByPath = new Dictionary<string, StateTuple>(); |
795 |
foreach (var file in files) |
796 |
{ |
797 |
var fsInfo = file.Item1; |
798 |
var fileHash = fsInfo is DirectoryInfo? MERKLE_EMPTY:file.Item2; |
799 |
|
800 |
tuplesByPath[fsInfo.FullName] = new StateTuple {FileInfo = fsInfo, MD5 = fileHash}; |
801 |
} |
802 |
foreach (var state in states) |
803 |
{ |
804 |
StateTuple hashTuple; |
805 |
if (tuplesByPath.TryGetValue(state.FilePath, out hashTuple)) |
806 |
{ |
807 |
hashTuple.FileState = state; |
808 |
} |
809 |
else |
810 |
{ |
811 |
var fsInfo = FileInfoExtensions.FromPath(state.FilePath); |
812 |
tuplesByPath[state.FilePath] = new StateTuple {FileInfo = fsInfo, FileState = state}; |
813 |
} |
814 |
} |
815 |
|
816 |
var tuplesByID = tuplesByPath.Values |
817 |
.Where(tuple => tuple.FileState != null && tuple.FileState.ObjectID!=null) |
818 |
.ToDictionary(tuple=>tuple.FileState.ObjectID,tuple=>tuple);//new Dictionary<Guid, StateTuple>(); |
819 |
|
820 |
foreach (var info in infos) |
821 |
{ |
822 |
StateTuple hashTuple; |
823 |
var filePath = info.Item1; |
824 |
var objectInfo = info.Item2; |
825 |
var objectID = objectInfo.UUID; |
826 |
|
827 |
if (tuplesByID.TryGetValue(objectID, out hashTuple)) |
828 |
{ |
829 |
hashTuple.ObjectInfo = objectInfo; |
830 |
} |
831 |
else if (tuplesByPath.TryGetValue(filePath, out hashTuple)) |
832 |
{ |
833 |
hashTuple.ObjectInfo = objectInfo; |
834 |
} |
835 |
else |
836 |
{ |
837 |
var fsInfo = FileInfoExtensions.FromPath(filePath); |
838 |
var tuple = new StateTuple {FileInfo = fsInfo, ObjectInfo = objectInfo}; |
839 |
tuplesByPath[filePath] = tuple; |
840 |
tuplesByID[objectInfo.UUID] = tuple; |
841 |
} |
842 |
} |
843 |
return tuplesByPath.Values; |
844 |
} |
845 |
|
846 |
/// <summary> |
847 |
/// Returns the latest LastModified date from the list of objects, but only if it is before |
848 |
/// than the threshold value |
849 |
/// </summary> |
850 |
/// <param name="threshold"></param> |
851 |
/// <param name="cloudObjects"></param> |
852 |
/// <returns></returns> |
853 |
private static DateTime? GetLatestDateBefore(DateTime? threshold, IList<ObjectInfo> cloudObjects) |
854 |
{ |
855 |
DateTime? maxDate = null; |
856 |
if (cloudObjects!=null && cloudObjects.Count > 0) |
857 |
maxDate = cloudObjects.Max(obj => obj.Last_Modified); |
858 |
if (maxDate == null || maxDate == DateTime.MinValue) |
859 |
return threshold; |
860 |
if (threshold == null || threshold == DateTime.MinValue || threshold > maxDate) |
861 |
return maxDate; |
862 |
return threshold; |
863 |
} |
864 |
|
865 |
/// <summary> |
866 |
/// Returns the latest LastModified date from the list of objects, but only if it is after |
867 |
/// the threshold value |
868 |
/// </summary> |
869 |
/// <param name="threshold"></param> |
870 |
/// <param name="cloudObjects"></param> |
871 |
/// <returns></returns> |
872 |
private static DateTime? GetLatestDateAfter(DateTime? threshold, IList<ObjectInfo> cloudObjects) |
873 |
{ |
874 |
DateTime? maxDate = null; |
875 |
if (cloudObjects!=null && cloudObjects.Count > 0) |
876 |
maxDate = cloudObjects.Max(obj => obj.Last_Modified); |
877 |
if (maxDate == null || maxDate == DateTime.MinValue) |
878 |
return threshold; |
879 |
if (threshold == null || threshold == DateTime.MinValue || threshold < maxDate) |
880 |
return maxDate; |
881 |
return threshold; |
882 |
} |
883 |
|
884 |
readonly AccountsDifferencer _differencer = new AccountsDifferencer(); |
885 |
private Dictionary<Uri, List<Uri>> _selectiveUris = new Dictionary<Uri, List<Uri>>(); |
886 |
private bool _pause; |
887 |
private static string MERKLE_EMPTY = "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"; |
888 |
|
889 |
/// <summary> |
890 |
/// Deletes local files that are not found in the list of cloud files |
891 |
/// </summary> |
892 |
/// <param name="accountInfo"></param> |
893 |
/// <param name="cloudFiles"></param> |
894 |
private void ProcessDeletedFiles(AccountInfo accountInfo, IEnumerable<ObjectInfo> cloudFiles) |
895 |
{ |
896 |
if (accountInfo == null) |
897 |
throw new ArgumentNullException("accountInfo"); |
898 |
if (String.IsNullOrWhiteSpace(accountInfo.AccountPath)) |
899 |
throw new ArgumentException("The AccountInfo.AccountPath is empty", "accountInfo"); |
900 |
if (cloudFiles == null) |
901 |
throw new ArgumentNullException("cloudFiles"); |
902 |
Contract.EndContractBlock(); |
903 |
|
904 |
var deletedFiles = new List<FileSystemInfo>(); |
905 |
foreach (var objectInfo in cloudFiles) |
906 |
{ |
907 |
if (Log.IsDebugEnabled) |
908 |
Log.DebugFormat("Handle deleted [{0}]", objectInfo.Uri); |
909 |
var relativePath = objectInfo.RelativeUrlToFilePath(accountInfo.UserName); |
910 |
var item = FileAgent.GetFileAgent(accountInfo).GetFileSystemInfo(relativePath); |
911 |
if (Log.IsDebugEnabled) |
912 |
Log.DebugFormat("Will delete [{0}] for [{1}]", item.FullName, objectInfo.Uri); |
913 |
if (item.Exists) |
914 |
{ |
915 |
if ((item.Attributes & FileAttributes.ReadOnly) == FileAttributes.ReadOnly) |
916 |
{ |
917 |
item.Attributes = item.Attributes & ~FileAttributes.ReadOnly; |
918 |
|
919 |
} |
920 |
|
921 |
|
922 |
Log.DebugFormat("Deleting {0}", item.FullName); |
923 |
|
924 |
var directory = item as DirectoryInfo; |
925 |
if (directory != null) |
926 |
directory.Delete(true); |
927 |
else |
928 |
item.Delete(); |
929 |
Log.DebugFormat("Deleted [{0}] for [{1}]", item.FullName, objectInfo.Uri); |
930 |
DateTime lastDate; |
931 |
_lastSeen.TryRemove(item.FullName, out lastDate); |
932 |
deletedFiles.Add(item); |
933 |
} |
934 |
StatusKeeper.SetFileState(item.FullName, FileStatus.Deleted, FileOverlayStatus.Deleted, "File Deleted"); |
935 |
} |
936 |
Log.InfoFormat("[{0}] files were deleted", deletedFiles.Count); |
937 |
StatusNotification.NotifyForFiles(deletedFiles, String.Format("{0} files were deleted", deletedFiles.Count), |
938 |
TraceLevel.Info); |
939 |
|
940 |
} |
941 |
|
942 |
private void MarkSuspectedDeletes(AccountInfo accountInfo, IEnumerable<ObjectInfo> cloudFiles) |
943 |
{ |
944 |
//Only consider files that are not being modified, ie they are in the Unchanged state |
945 |
var deleteCandidates = FileState.Queryable.Where(state => |
946 |
state.FilePath.StartsWith(accountInfo.AccountPath) |
947 |
&& state.FileStatus == FileStatus.Unchanged).ToList(); |
948 |
|
949 |
|
950 |
//TODO: filesToDelete must take into account the Others container |
951 |
var filesToDelete = (from deleteCandidate in deleteCandidates |
952 |
let localFile = FileInfoExtensions.FromPath(deleteCandidate.FilePath) |
953 |
let relativeFilePath = localFile.AsRelativeTo(accountInfo.AccountPath) |
954 |
where |
955 |
!cloudFiles.Any(r => r.RelativeUrlToFilePath(accountInfo.UserName) == relativeFilePath) |
956 |
select localFile).ToList(); |
957 |
|
958 |
|
959 |
//Set the status of missing files to Conflict |
960 |
foreach (var item in filesToDelete) |
961 |
{ |
962 |
//Try to acquire a gate on the file, to take into account files that have been dequeued |
963 |
//and are being processed |
964 |
using (var gate = NetworkGate.Acquire(item.FullName, NetworkOperation.Deleting)) |
965 |
{ |
966 |
if (gate.Failed) |
967 |
continue; |
968 |
StatusKeeper.SetFileState(item.FullName, FileStatus.Conflict, FileOverlayStatus.Deleted, |
969 |
"Local file missing from server"); |
970 |
} |
971 |
} |
972 |
UpdateStatus(PithosStatus.HasConflicts); |
973 |
StatusNotification.NotifyConflicts(filesToDelete, |
974 |
String.Format( |
975 |
"{0} local files are missing from Pithos, possibly because they were deleted", |
976 |
filesToDelete.Count)); |
977 |
StatusNotification.NotifyForFiles(filesToDelete, String.Format("{0} files were deleted", filesToDelete.Count), |
978 |
TraceLevel.Info); |
979 |
} |
980 |
|
981 |
private void ReportConflictForMismatch(string localFilePath) |
982 |
{ |
983 |
if (String.IsNullOrWhiteSpace(localFilePath)) |
984 |
throw new ArgumentNullException("localFilePath"); |
985 |
Contract.EndContractBlock(); |
986 |
|
987 |
StatusKeeper.SetFileState(localFilePath, FileStatus.Conflict, FileOverlayStatus.Conflict, "File changed at the server"); |
988 |
UpdateStatus(PithosStatus.HasConflicts); |
989 |
var message = String.Format("Conflict detected for file {0}", localFilePath); |
990 |
Log.Warn(message); |
991 |
StatusNotification.NotifyChange(message, TraceLevel.Warning); |
992 |
} |
993 |
|
994 |
|
995 |
|
996 |
/// <summary> |
997 |
/// Creates a Sync action for each changed server file |
998 |
/// </summary> |
999 |
/// <param name="accountInfo"></param> |
1000 |
/// <param name="changes"></param> |
1001 |
/// <returns></returns> |
1002 |
private IEnumerable<CloudAction> ChangesToActions(AccountInfo accountInfo, IEnumerable<ObjectInfo> changes) |
1003 |
{ |
1004 |
if (changes == null) |
1005 |
throw new ArgumentNullException(); |
1006 |
Contract.EndContractBlock(); |
1007 |
var fileAgent = FileAgent.GetFileAgent(accountInfo); |
1008 |
|
1009 |
//In order to avoid multiple iterations over the files, we iterate only once |
1010 |
//over the remote files |
1011 |
foreach (var objectInfo in changes) |
1012 |
{ |
1013 |
var relativePath = objectInfo.RelativeUrlToFilePath(accountInfo.UserName); |
1014 |
//If a directory object already exists, we may need to sync it |
1015 |
if (fileAgent.Exists(relativePath)) |
1016 |
{ |
1017 |
var localFile = fileAgent.GetFileSystemInfo(relativePath); |
1018 |
//We don't need to sync directories |
1019 |
if (objectInfo.IsDirectory && localFile is DirectoryInfo) |
1020 |
continue; |
1021 |
using (new SessionScope(FlushAction.Never)) |
1022 |
{ |
1023 |
var state = StatusKeeper.GetStateByFilePath(localFile.FullName); |
1024 |
_lastSeen[localFile.FullName] = DateTime.Now; |
1025 |
//Common files should be checked on a per-case basis to detect differences, which is newer |
1026 |
|
1027 |
yield return new CloudAction(accountInfo, CloudActionType.MustSynch, |
1028 |
localFile, objectInfo, state, accountInfo.BlockSize, |
1029 |
accountInfo.BlockHash,"Poll Changes"); |
1030 |
} |
1031 |
} |
1032 |
else |
1033 |
{ |
1034 |
//Remote files should be downloaded |
1035 |
yield return new CloudDownloadAction(accountInfo, objectInfo,"Poll Changes"); |
1036 |
} |
1037 |
} |
1038 |
} |
1039 |
|
1040 |
/// <summary> |
1041 |
/// Creates a Local Move action for each moved server file |
1042 |
/// </summary> |
1043 |
/// <param name="accountInfo"></param> |
1044 |
/// <param name="moves"></param> |
1045 |
/// <returns></returns> |
1046 |
private IEnumerable<CloudAction> MovesToActions(AccountInfo accountInfo, IEnumerable<ObjectInfo> moves) |
1047 |
{ |
1048 |
if (moves == null) |
1049 |
throw new ArgumentNullException(); |
1050 |
Contract.EndContractBlock(); |
1051 |
var fileAgent = FileAgent.GetFileAgent(accountInfo); |
1052 |
|
1053 |
//In order to avoid multiple iterations over the files, we iterate only once |
1054 |
//over the remote files |
1055 |
foreach (var objectInfo in moves) |
1056 |
{ |
1057 |
var previousRelativepath = objectInfo.Previous.RelativeUrlToFilePath(accountInfo.UserName); |
1058 |
//If the previous file already exists, we can execute a Move operation |
1059 |
if (fileAgent.Exists(previousRelativepath)) |
1060 |
{ |
1061 |
var previousFile = fileAgent.GetFileSystemInfo(previousRelativepath); |
1062 |
using (new SessionScope(FlushAction.Never)) |
1063 |
{ |
1064 |
var state = StatusKeeper.GetStateByFilePath(previousFile.FullName); |
1065 |
_lastSeen[previousFile.FullName] = DateTime.Now; |
1066 |
|
1067 |
//For each moved object we need to move both the local file and update |
1068 |
yield return new CloudAction(accountInfo, CloudActionType.RenameLocal, |
1069 |
previousFile, objectInfo, state, accountInfo.BlockSize, |
1070 |
accountInfo.BlockHash,"Poll Moves"); |
1071 |
//For modified files, we need to download the changes as well |
1072 |
if (objectInfo.X_Object_Hash != objectInfo.PreviousHash) |
1073 |
yield return new CloudDownloadAction(accountInfo,objectInfo, "Poll Moves"); |
1074 |
} |
1075 |
} |
1076 |
//If the previous file does not exist, we need to download it in the new location |
1077 |
else |
1078 |
{ |
1079 |
//Remote files should be downloaded |
1080 |
yield return new CloudDownloadAction(accountInfo, objectInfo, "Poll Moves"); |
1081 |
} |
1082 |
} |
1083 |
} |
1084 |
|
1085 |
|
1086 |
/// <summary> |
1087 |
/// Creates a download action for each new server file |
1088 |
/// </summary> |
1089 |
/// <param name="accountInfo"></param> |
1090 |
/// <param name="creates"></param> |
1091 |
/// <returns></returns> |
1092 |
private IEnumerable<CloudAction> CreatesToActions(AccountInfo accountInfo, IEnumerable<ObjectInfo> creates) |
1093 |
{ |
1094 |
if (creates == null) |
1095 |
throw new ArgumentNullException(); |
1096 |
Contract.EndContractBlock(); |
1097 |
var fileAgent = FileAgent.GetFileAgent(accountInfo); |
1098 |
|
1099 |
//In order to avoid multiple iterations over the files, we iterate only once |
1100 |
//over the remote files |
1101 |
foreach (var objectInfo in creates) |
1102 |
{ |
1103 |
if (Log.IsDebugEnabled) |
1104 |
Log.DebugFormat("[NEW INFO] {0}",objectInfo.Uri); |
1105 |
|
1106 |
var relativePath = objectInfo.RelativeUrlToFilePath(accountInfo.UserName); |
1107 |
|
1108 |
//If the object already exists, we should check before uploading or downloading |
1109 |
if (fileAgent.Exists(relativePath)) |
1110 |
{ |
1111 |
var localFile= fileAgent.GetFileSystemInfo(relativePath); |
1112 |
var state = StatusKeeper.GetStateByFilePath(localFile.WithProperCapitalization().FullName); |
1113 |
yield return new CloudAction(accountInfo, CloudActionType.MustSynch, |
1114 |
localFile, objectInfo, state, accountInfo.BlockSize, |
1115 |
accountInfo.BlockHash,"Poll Creates"); |
1116 |
} |
1117 |
else |
1118 |
{ |
1119 |
//Remote files should be downloaded |
1120 |
yield return new CloudDownloadAction(accountInfo, objectInfo,"Poll Creates"); |
1121 |
} |
1122 |
|
1123 |
} |
1124 |
} |
1125 |
|
1126 |
/// <summary> |
1127 |
/// Notify the UI to update the visual status |
1128 |
/// </summary> |
1129 |
/// <param name="status"></param> |
1130 |
private void UpdateStatus(PithosStatus status) |
1131 |
{ |
1132 |
try |
1133 |
{ |
1134 |
StatusNotification.SetPithosStatus(status); |
1135 |
//StatusNotification.Notify(new Notification()); |
1136 |
} |
1137 |
catch (Exception exc) |
1138 |
{ |
1139 |
//Failure is not critical, just log it |
1140 |
Log.Warn("Error while updating status", exc); |
1141 |
} |
1142 |
} |
1143 |
|
1144 |
private static void CreateContainerFolders(AccountInfo accountInfo, IEnumerable<ContainerInfo> containers) |
1145 |
{ |
1146 |
var containerPaths = from container in containers |
1147 |
let containerPath = Path.Combine(accountInfo.AccountPath, container.Name) |
1148 |
where container.Name != FolderConstants.TrashContainer && !Directory.Exists(containerPath) |
1149 |
select containerPath; |
1150 |
|
1151 |
foreach (var path in containerPaths) |
1152 |
{ |
1153 |
Directory.CreateDirectory(path); |
1154 |
} |
1155 |
} |
1156 |
|
1157 |
public void AddAccount(AccountInfo accountInfo) |
1158 |
{ |
1159 |
//Avoid adding a duplicate accountInfo |
1160 |
_accounts.TryAdd(accountInfo.AccountKey, accountInfo); |
1161 |
} |
1162 |
|
1163 |
public void RemoveAccount(AccountInfo accountInfo) |
1164 |
{ |
1165 |
AccountInfo account; |
1166 |
_accounts.TryRemove(accountInfo.AccountKey, out account); |
1167 |
|
1168 |
SnapshotDifferencer differencer; |
1169 |
_differencer.Differencers.TryRemove(accountInfo.AccountKey, out differencer); |
1170 |
} |
1171 |
|
1172 |
public void SetSelectivePaths(AccountInfo accountInfo,Uri[] added, Uri[] removed) |
1173 |
{ |
1174 |
AbortRemovedPaths(accountInfo,removed); |
1175 |
//DownloadNewPaths(accountInfo,added); |
1176 |
} |
1177 |
|
1178 |
/* |
1179 |
private void DownloadNewPaths(AccountInfo accountInfo, Uri[] added) |
1180 |
{ |
1181 |
var client = new CloudFilesClient(accountInfo); |
1182 |
foreach (var folderUri in added) |
1183 |
{ |
1184 |
try |
1185 |
{ |
1186 |
|
1187 |
string account; |
1188 |
string container; |
1189 |
var segmentsCount = folderUri.Segments.Length; |
1190 |
//Is this an account URL? |
1191 |
if (segmentsCount < 3) |
1192 |
continue; |
1193 |
//Is this a container or folder URL? |
1194 |
if (segmentsCount == 3) |
1195 |
{ |
1196 |
account = folderUri.Segments[1].TrimEnd('/'); |
1197 |
container = folderUri.Segments[2].TrimEnd('/'); |
1198 |
} |
1199 |
else |
1200 |
{ |
1201 |
account = folderUri.Segments[2].TrimEnd('/'); |
1202 |
container = folderUri.Segments[3].TrimEnd('/'); |
1203 |
} |
1204 |
IList<ObjectInfo> items; |
1205 |
if (segmentsCount > 3) |
1206 |
{ |
1207 |
//List folder |
1208 |
var folder = String.Join("", folderUri.Segments.Splice(4)); |
1209 |
items = client.ListObjects(account, container, folder); |
1210 |
} |
1211 |
else |
1212 |
{ |
1213 |
//List container |
1214 |
items = client.ListObjects(account, container); |
1215 |
} |
1216 |
var actions = CreatesToActions(accountInfo, items); |
1217 |
foreach (var action in actions) |
1218 |
{ |
1219 |
NetworkAgent.Post(action); |
1220 |
} |
1221 |
} |
1222 |
catch (Exception exc) |
1223 |
{ |
1224 |
Log.WarnFormat("Listing of new selective path [{0}] failed with \r\n{1}", folderUri, exc); |
1225 |
} |
1226 |
} |
1227 |
|
1228 |
//Need to get a listing of each of the URLs, then post them to the NetworkAgent |
1229 |
//CreatesToActions(accountInfo,) |
1230 |
|
1231 |
/* NetworkAgent.Post();#1# |
1232 |
} |
1233 |
*/ |
1234 |
|
1235 |
private void AbortRemovedPaths(AccountInfo accountInfo, Uri[] removed) |
1236 |
{ |
1237 |
/*this.NetworkAgent.*/ |
1238 |
} |
1239 |
} |
1240 |
} |