root / trunk / Pithos.Core / Agents / PollAgent.cs @ 1cc1e8c5
History | View | Annotate | Download (47.7 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 Castle.ActiveRecord; |
54 |
using Pithos.Interfaces; |
55 |
using Pithos.Network; |
56 |
using log4net; |
57 |
|
58 |
namespace Pithos.Core.Agents |
59 |
{ |
60 |
using System; |
61 |
using System.Collections.Generic; |
62 |
using System.Linq; |
63 |
|
64 |
[DebuggerDisplay("{FilePath} C:{C} L:{L} S:{S}")] |
65 |
public class StateTuple |
66 |
{ |
67 |
public string FilePath { get; private set; } |
68 |
|
69 |
public string MD5 { get; set; } |
70 |
|
71 |
public string L |
72 |
{ |
73 |
get { return FileState==null?null:FileState.Checksum; } |
74 |
} |
75 |
|
76 |
public string C { get; set; } |
77 |
|
78 |
public string S |
79 |
{ |
80 |
get { return ObjectInfo == null ? null : ObjectInfo.X_Object_Hash; } |
81 |
} |
82 |
|
83 |
private FileSystemInfo _fileInfo; |
84 |
public FileSystemInfo FileInfo |
85 |
{ |
86 |
get { return _fileInfo; } |
87 |
set |
88 |
{ |
89 |
_fileInfo = value; |
90 |
FilePath = value.FullName; |
91 |
} |
92 |
} |
93 |
|
94 |
public FileState FileState { get; set; } |
95 |
public ObjectInfo ObjectInfo{ get; set; } |
96 |
|
97 |
public StateTuple() { } |
98 |
|
99 |
public StateTuple(FileSystemInfo info) |
100 |
{ |
101 |
FileInfo = info; |
102 |
} |
103 |
|
104 |
|
105 |
} |
106 |
|
107 |
|
108 |
/// <summary> |
109 |
/// PollAgent periodically polls the server to detect object changes. The agent retrieves a listing of all |
110 |
/// objects and compares it with a previously cached version to detect differences. |
111 |
/// New files are downloaded, missing files are deleted from the local file system and common files are compared |
112 |
/// to determine the appropriate action |
113 |
/// </summary> |
114 |
[Export] |
115 |
public class PollAgent |
116 |
{ |
117 |
private static readonly ILog Log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType); |
118 |
|
119 |
[System.ComponentModel.Composition.Import] |
120 |
public IStatusKeeper StatusKeeper { get; set; } |
121 |
|
122 |
[System.ComponentModel.Composition.Import] |
123 |
public IPithosSettings Settings { get; set; } |
124 |
|
125 |
[System.ComponentModel.Composition.Import] |
126 |
public NetworkAgent NetworkAgent { get; set; } |
127 |
|
128 |
[System.ComponentModel.Composition.Import] |
129 |
public Selectives Selectives { get; set; } |
130 |
|
131 |
public IStatusNotification StatusNotification { get; set; } |
132 |
|
133 |
private CancellationTokenSource _currentOperationCancellation = new CancellationTokenSource(); |
134 |
|
135 |
public void CancelCurrentOperation() |
136 |
{ |
137 |
//What does it mean to cancel the current upload/download? |
138 |
//Obviously, the current operation will be cancelled by throwing |
139 |
//a cancellation exception. |
140 |
// |
141 |
//The default behavior is to retry any operations that throw. |
142 |
//Obviously this is not what we want in this situation. |
143 |
//The cancelled operation should NOT bea retried. |
144 |
// |
145 |
//This can be done by catching the cancellation exception |
146 |
//and avoiding the retry. |
147 |
// |
148 |
|
149 |
//Have to reset the cancellation source - it is not possible to reset the source |
150 |
//Have to prevent a case where an operation requests a token from the old source |
151 |
var oldSource = Interlocked.Exchange(ref _currentOperationCancellation, new CancellationTokenSource()); |
152 |
oldSource.Cancel(); |
153 |
|
154 |
} |
155 |
|
156 |
public bool Pause |
157 |
{ |
158 |
get { |
159 |
return _pause; |
160 |
} |
161 |
set { |
162 |
_pause = value; |
163 |
if (!_pause) |
164 |
_unPauseEvent.Set(); |
165 |
else |
166 |
{ |
167 |
_unPauseEvent.Reset(); |
168 |
} |
169 |
} |
170 |
} |
171 |
|
172 |
private bool _firstPoll = true; |
173 |
|
174 |
//The Sync Event signals a manual synchronisation |
175 |
private readonly AsyncManualResetEvent _syncEvent = new AsyncManualResetEvent(); |
176 |
|
177 |
private readonly AsyncManualResetEvent _unPauseEvent = new AsyncManualResetEvent(true); |
178 |
|
179 |
private readonly ConcurrentDictionary<string, DateTime> _lastSeen = new ConcurrentDictionary<string, DateTime>(); |
180 |
private readonly ConcurrentDictionary<Uri, AccountInfo> _accounts = new ConcurrentDictionary<Uri,AccountInfo>(); |
181 |
|
182 |
|
183 |
/// <summary> |
184 |
/// Start a manual synchronization |
185 |
/// </summary> |
186 |
public void SynchNow() |
187 |
{ |
188 |
_syncEvent.Set(); |
189 |
} |
190 |
|
191 |
|
192 |
/// <summary> |
193 |
/// Remote files are polled periodically. Any changes are processed |
194 |
/// </summary> |
195 |
/// <param name="since"></param> |
196 |
/// <returns></returns> |
197 |
public async Task PollRemoteFiles(DateTime? since = null) |
198 |
{ |
199 |
if (Log.IsDebugEnabled) |
200 |
Log.DebugFormat("Polling changes after [{0}]",since); |
201 |
|
202 |
Debug.Assert(Thread.CurrentThread.IsBackground, "Polling Ended up in the main thread!"); |
203 |
|
204 |
//GC.Collect(); |
205 |
|
206 |
using (ThreadContext.Stacks["Retrieve Remote"].Push("All accounts")) |
207 |
{ |
208 |
//If this poll fails, we will retry with the same since value |
209 |
var nextSince = since; |
210 |
try |
211 |
{ |
212 |
await _unPauseEvent.WaitAsync(); |
213 |
UpdateStatus(PithosStatus.PollSyncing); |
214 |
|
215 |
var tasks = from accountInfo in _accounts.Values |
216 |
select ProcessAccountFiles(accountInfo, since); |
217 |
|
218 |
var nextTimes=await TaskEx.WhenAll(tasks.ToList()); |
219 |
|
220 |
_firstPoll = false; |
221 |
//Reschedule the poll with the current timestamp as a "since" value |
222 |
|
223 |
if (nextTimes.Length>0) |
224 |
nextSince = nextTimes.Min(); |
225 |
if (Log.IsDebugEnabled) |
226 |
Log.DebugFormat("Next Poll at [{0}]",nextSince); |
227 |
} |
228 |
catch (Exception ex) |
229 |
{ |
230 |
Log.ErrorFormat("Error while processing accounts\r\n{0}", ex); |
231 |
//In case of failure retry with the same "since" value |
232 |
} |
233 |
|
234 |
UpdateStatus(PithosStatus.PollComplete); |
235 |
//The multiple try blocks are required because we can't have an await call |
236 |
//inside a finally block |
237 |
//TODO: Find a more elegant solution for reschedulling in the event of an exception |
238 |
try |
239 |
{ |
240 |
//Wait for the polling interval to pass or the Sync event to be signalled |
241 |
nextSince = await WaitForScheduledOrManualPoll(nextSince); |
242 |
} |
243 |
finally |
244 |
{ |
245 |
//Ensure polling is scheduled even in case of error |
246 |
TaskEx.Run(() => PollRemoteFiles(nextSince)); |
247 |
} |
248 |
} |
249 |
} |
250 |
|
251 |
/// <summary> |
252 |
/// Wait for the polling period to expire or a manual sync request |
253 |
/// </summary> |
254 |
/// <param name="since"></param> |
255 |
/// <returns></returns> |
256 |
private async Task<DateTime?> WaitForScheduledOrManualPoll(DateTime? since) |
257 |
{ |
258 |
var sync = _syncEvent.WaitAsync(); |
259 |
var wait = TaskEx.Delay(TimeSpan.FromSeconds(Settings.PollingInterval), NetworkAgent.CancellationToken); |
260 |
|
261 |
var signaledTask = await TaskEx.WhenAny(sync, wait); |
262 |
|
263 |
//Pausing takes precedence over manual sync or awaiting |
264 |
_unPauseEvent.Wait(); |
265 |
|
266 |
//Wait for network processing to finish before polling |
267 |
var pauseTask=NetworkAgent.ProceedEvent.WaitAsync(); |
268 |
await TaskEx.WhenAll(signaledTask, pauseTask); |
269 |
|
270 |
//If polling is signalled by SynchNow, ignore the since tag |
271 |
if (sync.IsCompleted) |
272 |
{ |
273 |
//TODO: Must convert to AutoReset |
274 |
_syncEvent.Reset(); |
275 |
return null; |
276 |
} |
277 |
return since; |
278 |
} |
279 |
|
280 |
public async Task<DateTime?> ProcessAccountFiles(AccountInfo accountInfo, DateTime? since = null) |
281 |
{ |
282 |
if (accountInfo == null) |
283 |
throw new ArgumentNullException("accountInfo"); |
284 |
if (String.IsNullOrWhiteSpace(accountInfo.AccountPath)) |
285 |
throw new ArgumentException("The AccountInfo.AccountPath is empty", "accountInfo"); |
286 |
Contract.EndContractBlock(); |
287 |
|
288 |
|
289 |
using (ThreadContext.Stacks["Retrieve Remote"].Push(accountInfo.UserName)) |
290 |
{ |
291 |
|
292 |
await NetworkAgent.GetDeleteAwaiter(); |
293 |
|
294 |
Log.Info("Scheduled"); |
295 |
var client = new CloudFilesClient(accountInfo); |
296 |
|
297 |
//We don't need to check the trash container |
298 |
var containers = client.ListContainers(accountInfo.UserName) |
299 |
.Where(c=>c.Name!="trash") |
300 |
.ToList(); |
301 |
|
302 |
|
303 |
CreateContainerFolders(accountInfo, containers); |
304 |
|
305 |
//The nextSince time fallback time is the same as the current. |
306 |
//If polling succeeds, the next Since time will be the smallest of the maximum modification times |
307 |
//of the shared and account objects |
308 |
var nextSince = since; |
309 |
|
310 |
try |
311 |
{ |
312 |
//Wait for any deletions to finish |
313 |
await NetworkAgent.GetDeleteAwaiter(); |
314 |
//Get the poll time now. We may miss some deletions but it's better to keep a file that was deleted |
315 |
//than delete a file that was created while we were executing the poll |
316 |
|
317 |
//Get the list of server objects changed since the last check |
318 |
//The name of the container is passed as state in order to create a dictionary of tasks in a subsequent step |
319 |
var listObjects = (from container in containers |
320 |
select Task<IList<ObjectInfo>>.Factory.StartNew(_ => |
321 |
client.ListObjects(accountInfo.UserName, container.Name, since), container.Name)).ToList(); |
322 |
|
323 |
var listShared = Task<IList<ObjectInfo>>.Factory.StartNew(_ => |
324 |
client.ListSharedObjects(since), "shared"); |
325 |
listObjects.Add(listShared); |
326 |
var listTasks = await Task.Factory.WhenAll(listObjects.ToArray()); |
327 |
|
328 |
using (ThreadContext.Stacks["SCHEDULE"].Push("Process Results")) |
329 |
{ |
330 |
var dict = listTasks.ToDictionary(t => t.AsyncState); |
331 |
|
332 |
//Get all non-trash objects. Remember, the container name is stored in AsyncState |
333 |
var remoteObjects = (from objectList in listTasks |
334 |
where (string)objectList.AsyncState != "trash" |
335 |
from obj in objectList.Result |
336 |
orderby obj.Bytes ascending |
337 |
select obj).ToList(); |
338 |
|
339 |
//Get the latest remote object modification date, only if it is after |
340 |
//the original since date |
341 |
nextSince = GetLatestDateAfter(nextSince, remoteObjects); |
342 |
|
343 |
var sharedObjects = dict["shared"].Result; |
344 |
nextSince = GetLatestDateBefore(nextSince, sharedObjects); |
345 |
|
346 |
//DON'T process trashed files |
347 |
//If some files are deleted and added again to a folder, they will be deleted |
348 |
//even though they are new. |
349 |
//We would have to check file dates and hashes to ensure that a trashed file |
350 |
//can be deleted safely from the local hard drive. |
351 |
/* |
352 |
//Items with the same name, hash may be both in the container and the trash |
353 |
//Don't delete items that exist in the container |
354 |
var realTrash = from trash in trashObjects |
355 |
where |
356 |
!remoteObjects.Any( |
357 |
info => info.Name == trash.Name && info.Hash == trash.Hash) |
358 |
select trash; |
359 |
ProcessTrashedFiles(accountInfo, realTrash); |
360 |
*/ |
361 |
|
362 |
var cleanRemotes = (from info in remoteObjects.Union(sharedObjects) |
363 |
let name = info.Name??"" |
364 |
where !name.EndsWith(".ignore", StringComparison.InvariantCultureIgnoreCase) && |
365 |
!name.StartsWith(FolderConstants.CacheFolder + "/", |
366 |
StringComparison.InvariantCultureIgnoreCase) |
367 |
select info).ToList(); |
368 |
|
369 |
if (_firstPoll) |
370 |
StatusKeeper.CleanupOrphanStates(); |
371 |
StatusKeeper.CleanupStaleStates(accountInfo, cleanRemotes); |
372 |
|
373 |
//var differencer = _differencer.PostSnapshot(accountInfo, cleanRemotes); |
374 |
|
375 |
var filterUris = Selectives.SelectiveUris[accountInfo.AccountKey]; |
376 |
|
377 |
|
378 |
//Get the local files here |
379 |
var agent = AgentLocator<FileAgent>.Get(accountInfo.AccountPath); |
380 |
|
381 |
var files = LoadLocalFileTuples(accountInfo); |
382 |
|
383 |
var states = FileState.Queryable.ToList(); |
384 |
|
385 |
var infos = (from remote in cleanRemotes |
386 |
let path = remote.RelativeUrlToFilePath(accountInfo.UserName) |
387 |
let info=agent.GetFileSystemInfo(path) |
388 |
select Tuple.Create(info.FullName,remote)) |
389 |
.ToList(); |
390 |
|
391 |
var token = _currentOperationCancellation.Token; |
392 |
|
393 |
var tuples = MergeSources(infos, files, states).ToList(); |
394 |
|
395 |
|
396 |
foreach (var tuple in tuples) |
397 |
{ |
398 |
await _unPauseEvent.WaitAsync(); |
399 |
|
400 |
//Set the Merkle Hash |
401 |
SetMerkleHash(accountInfo, tuple); |
402 |
|
403 |
SyncSingleItem(accountInfo, tuple, agent, token); |
404 |
|
405 |
} |
406 |
|
407 |
|
408 |
//On the first run |
409 |
/* |
410 |
if (_firstPoll) |
411 |
{ |
412 |
MarkSuspectedDeletes(accountInfo, cleanRemotes); |
413 |
} |
414 |
*/ |
415 |
|
416 |
|
417 |
Log.Info("[LISTENER] End Processing"); |
418 |
} |
419 |
} |
420 |
catch (Exception ex) |
421 |
{ |
422 |
Log.ErrorFormat("[FAIL] ListObjects for{0} in ProcessRemoteFiles with {1}", accountInfo.UserName, ex); |
423 |
return nextSince; |
424 |
} |
425 |
|
426 |
Log.Info("[LISTENER] Finished"); |
427 |
return nextSince; |
428 |
} |
429 |
} |
430 |
|
431 |
private static void SetMerkleHash(AccountInfo accountInfo, StateTuple tuple) |
432 |
{ |
433 |
//The Merkle hash for directories is that of an empty buffer |
434 |
if (tuple.FileInfo is DirectoryInfo) |
435 |
tuple.C = MERKLE_EMPTY; |
436 |
else if (tuple.FileState != null && tuple.MD5 == tuple.FileState.ShortHash) |
437 |
{ |
438 |
//If there is a state whose MD5 matches, load the merkle hash fromthe file state |
439 |
//insteaf of calculating it |
440 |
tuple.C = tuple.FileState.Checksum; |
441 |
} |
442 |
else |
443 |
{ |
444 |
tuple.C=Signature.CalculateTreeHash(tuple.FileInfo, accountInfo.BlockSize, accountInfo.BlockHash) |
445 |
.TopHash.ToHashString(); |
446 |
} |
447 |
} |
448 |
|
449 |
private static List<Tuple<FileSystemInfo, string>> LoadLocalFileTuples(AccountInfo accountInfo) |
450 |
{ |
451 |
using (ThreadContext.Stacks["Account Files Hashing"].Push(accountInfo.UserName)) |
452 |
{ |
453 |
|
454 |
var localInfos = AgentLocator<FileAgent>.Get(accountInfo.AccountPath).EnumerateFileSystemInfos(); |
455 |
//Use the queue to retry locked file hashing |
456 |
var fileQueue = new Queue<FileSystemInfo>(localInfos); |
457 |
var hasher = MD5.Create(); |
458 |
|
459 |
var results = new List<Tuple<FileSystemInfo, string>>(); |
460 |
|
461 |
while (fileQueue.Count > 0) |
462 |
{ |
463 |
var file = fileQueue.Dequeue(); |
464 |
using (ThreadContext.Stacks["File"].Push(file.FullName)) |
465 |
{ |
466 |
/* |
467 |
Signature.CalculateTreeHash(file, accountInfo.BlockSize, |
468 |
accountInfo.BlockHash). |
469 |
TopHash.ToHashString() |
470 |
*/ |
471 |
try |
472 |
{ |
473 |
//Replace MD5 here, do the calc while syncing individual files |
474 |
string hash ; |
475 |
if (file is DirectoryInfo) |
476 |
hash = MERKLE_EMPTY; |
477 |
else |
478 |
{ |
479 |
using (var stream = (file as FileInfo).OpenRead()) |
480 |
{ |
481 |
hash = hasher.ComputeHash(stream).ToHashString(); |
482 |
} |
483 |
} |
484 |
results.Add(Tuple.Create(file, hash)); |
485 |
} |
486 |
catch (IOException exc) |
487 |
{ |
488 |
Log.WarnFormat("[HASH] File in use, will retry [{0}]", exc); |
489 |
fileQueue.Enqueue(file); |
490 |
} |
491 |
} |
492 |
} |
493 |
|
494 |
return results; |
495 |
} |
496 |
} |
497 |
|
498 |
private void SyncSingleItem(AccountInfo accountInfo, StateTuple tuple, FileAgent agent, CancellationToken token) |
499 |
{ |
500 |
Log.DebugFormat("Sync [{0}] C:[{1}] L:[{2}] S:[{3}]",tuple.FilePath,tuple.C,tuple.L,tuple.S); |
501 |
|
502 |
var localFilePath = tuple.FilePath; |
503 |
//Don't use the tuple info, it may have been deleted |
504 |
var localInfo = FileInfoExtensions.FromPath(localFilePath); |
505 |
|
506 |
// Local file unchanged? If both C and L are null, make sure it's because |
507 |
//both the file is missing and the state checksum is not missing |
508 |
if (tuple.C == tuple.L && (localInfo.Exists || tuple.FileState==null)) |
509 |
{ |
510 |
//No local changes |
511 |
//Server unchanged? |
512 |
if (tuple.S == tuple.L) |
513 |
{ |
514 |
// No server changes |
515 |
; |
516 |
} |
517 |
else |
518 |
{ |
519 |
//Different from server |
520 |
if (Selectives.IsSelected(accountInfo, localFilePath)) |
521 |
{ |
522 |
//Does the server file exist? |
523 |
if (tuple.S == null) |
524 |
{ |
525 |
//Server file doesn't exist |
526 |
//deleteObjectFromLocal() |
527 |
StatusKeeper.SetFileState(localFilePath, FileStatus.Deleted, |
528 |
FileOverlayStatus.Deleted, ""); |
529 |
agent.Delete(localFilePath); |
530 |
//updateRecord(Remove C, L) |
531 |
StatusKeeper.ClearFileStatus(localFilePath); |
532 |
} |
533 |
else |
534 |
{ |
535 |
//Server file exists |
536 |
//downloadServerObject() // Result: L = S |
537 |
StatusKeeper.SetFileState(localFilePath, FileStatus.Modified, |
538 |
FileOverlayStatus.Modified, ""); |
539 |
NetworkAgent.Downloader.DownloadCloudFile(accountInfo, |
540 |
tuple.ObjectInfo, |
541 |
localFilePath, token).Wait(token); |
542 |
//updateRecord( L = S ) |
543 |
StatusKeeper.UpdateFileChecksum(localFilePath, tuple.ObjectInfo.ETag, |
544 |
tuple.ObjectInfo.X_Object_Hash); |
545 |
|
546 |
StatusKeeper.SetFileState(localFilePath, FileStatus.Unchanged, |
547 |
FileOverlayStatus.Normal, ""); |
548 |
} |
549 |
} |
550 |
} |
551 |
} |
552 |
else |
553 |
{ |
554 |
//Local changes found |
555 |
|
556 |
//Server unchanged? |
557 |
if (tuple.S == tuple.L) |
558 |
{ |
559 |
//The FileAgent selective sync checks for new root folder files |
560 |
if (!agent.Ignore(localFilePath)) |
561 |
{ |
562 |
if ((tuple.C == null || !localInfo.Exists) && tuple.ObjectInfo != null) |
563 |
{ |
564 |
//deleteObjectFromServer() |
565 |
DeleteCloudFile(accountInfo, tuple); |
566 |
//updateRecord( Remove L, S) |
567 |
} |
568 |
else |
569 |
{ |
570 |
//uploadLocalObject() // Result: S = C, L = S |
571 |
var isUnselected = agent.IsUnselectedRootFolder(tuple.FilePath); |
572 |
|
573 |
//Debug.Assert(tuple.FileState !=null); |
574 |
var action = new CloudUploadAction(accountInfo, localInfo, tuple.FileState, |
575 |
accountInfo.BlockSize, accountInfo.BlockHash, |
576 |
"Poll", isUnselected); |
577 |
NetworkAgent.Uploader.UploadCloudFile(action, token).Wait(token); |
578 |
|
579 |
|
580 |
//updateRecord( S = C ) |
581 |
StatusKeeper.SetFileState(localFilePath, FileStatus.Unchanged, |
582 |
FileOverlayStatus.Normal, ""); |
583 |
if (isUnselected) |
584 |
{ |
585 |
ProcessChildren(accountInfo, tuple, agent, token); |
586 |
} |
587 |
} |
588 |
} |
589 |
} |
590 |
else |
591 |
{ |
592 |
if (Selectives.IsSelected(accountInfo, localFilePath)) |
593 |
{ |
594 |
if (tuple.C == tuple.S) |
595 |
{ |
596 |
// (Identical Changes) Result: L = S |
597 |
//doNothing() |
598 |
StatusKeeper.UpdateFileChecksum(localFilePath, tuple.ObjectInfo.ETag, |
599 |
tuple.ObjectInfo.X_Object_Hash); |
600 |
StatusKeeper.SetFileState(localFilePath, FileStatus.Unchanged, |
601 |
FileOverlayStatus.Normal, ""); |
602 |
} |
603 |
else |
604 |
{ |
605 |
if ((tuple.C == null || !localInfo.Exists) && tuple.ObjectInfo != null ) |
606 |
{ |
607 |
//deleteObjectFromServer() |
608 |
DeleteCloudFile(accountInfo, tuple); |
609 |
//updateRecord(Remove L, S) |
610 |
} |
611 |
else |
612 |
{ |
613 |
ReportConflictForMismatch(localFilePath); |
614 |
//identifyAsConflict() // Manual action required |
615 |
} |
616 |
} |
617 |
} |
618 |
} |
619 |
} |
620 |
} |
621 |
|
622 |
private void DeleteCloudFile(AccountInfo accountInfo, StateTuple tuple) |
623 |
{ |
624 |
StatusKeeper.SetFileState(tuple.FilePath, FileStatus.Deleted, |
625 |
FileOverlayStatus.Deleted, ""); |
626 |
NetworkAgent.DeleteAgent.DeleteCloudFile(accountInfo, tuple.ObjectInfo); |
627 |
StatusKeeper.ClearFileStatus(tuple.FilePath); |
628 |
} |
629 |
|
630 |
private void ProcessChildren(AccountInfo accountInfo, StateTuple tuple, FileAgent agent, CancellationToken token) |
631 |
{ |
632 |
|
633 |
var dirInfo = tuple.FileInfo as DirectoryInfo; |
634 |
var folderTuples = from folder in dirInfo.EnumerateDirectories("*", SearchOption.AllDirectories) |
635 |
select new StateTuple(folder); |
636 |
var fileTuples = from file in dirInfo.EnumerateFiles("*", SearchOption.AllDirectories) |
637 |
select new StateTuple(file); |
638 |
|
639 |
//Process folders first, to ensure folders appear on the sever as soon as possible |
640 |
folderTuples.ApplyAction(t => SyncSingleItem(accountInfo, t, agent, token)); |
641 |
|
642 |
fileTuples.ApplyAction(t => SyncSingleItem(accountInfo, t, agent, token)); |
643 |
} |
644 |
|
645 |
private static IEnumerable<StateTuple> MergeSources( |
646 |
IEnumerable<Tuple<string, ObjectInfo>> infos, |
647 |
IEnumerable<Tuple<FileSystemInfo, string>> files, |
648 |
IEnumerable<FileState> states) |
649 |
{ |
650 |
var dct = new Dictionary<string, StateTuple>(); |
651 |
foreach (var file in files) |
652 |
{ |
653 |
var fsInfo = file.Item1; |
654 |
var fileHash = fsInfo is DirectoryInfo? MERKLE_EMPTY:file.Item2; |
655 |
|
656 |
dct[fsInfo.FullName] = new StateTuple {FileInfo = fsInfo, MD5 = fileHash}; |
657 |
} |
658 |
foreach (var state in states) |
659 |
{ |
660 |
StateTuple hashTuple; |
661 |
if (dct.TryGetValue(state.FilePath, out hashTuple)) |
662 |
{ |
663 |
hashTuple.FileState = state; |
664 |
} |
665 |
else |
666 |
{ |
667 |
var fsInfo = FileInfoExtensions.FromPath(state.FilePath); |
668 |
dct[state.FilePath] = new StateTuple {FileInfo = fsInfo, FileState = state}; |
669 |
} |
670 |
} |
671 |
foreach (var info in infos) |
672 |
{ |
673 |
StateTuple hashTuple; |
674 |
var filePath = info.Item1; |
675 |
var objectInfo = info.Item2; |
676 |
if (dct.TryGetValue(filePath, out hashTuple)) |
677 |
{ |
678 |
hashTuple.ObjectInfo = objectInfo; |
679 |
} |
680 |
else |
681 |
{ |
682 |
var fsInfo = FileInfoExtensions.FromPath(filePath); |
683 |
dct[filePath] = new StateTuple {FileInfo = fsInfo, ObjectInfo = objectInfo}; |
684 |
} |
685 |
} |
686 |
return dct.Values; |
687 |
} |
688 |
|
689 |
/// <summary> |
690 |
/// Returns the latest LastModified date from the list of objects, but only if it is before |
691 |
/// than the threshold value |
692 |
/// </summary> |
693 |
/// <param name="threshold"></param> |
694 |
/// <param name="cloudObjects"></param> |
695 |
/// <returns></returns> |
696 |
private static DateTime? GetLatestDateBefore(DateTime? threshold, IList<ObjectInfo> cloudObjects) |
697 |
{ |
698 |
DateTime? maxDate = null; |
699 |
if (cloudObjects!=null && cloudObjects.Count > 0) |
700 |
maxDate = cloudObjects.Max(obj => obj.Last_Modified); |
701 |
if (maxDate == null || maxDate == DateTime.MinValue) |
702 |
return threshold; |
703 |
if (threshold == null || threshold == DateTime.MinValue || threshold > maxDate) |
704 |
return maxDate; |
705 |
return threshold; |
706 |
} |
707 |
|
708 |
/// <summary> |
709 |
/// Returns the latest LastModified date from the list of objects, but only if it is after |
710 |
/// the threshold value |
711 |
/// </summary> |
712 |
/// <param name="threshold"></param> |
713 |
/// <param name="cloudObjects"></param> |
714 |
/// <returns></returns> |
715 |
private static DateTime? GetLatestDateAfter(DateTime? threshold, IList<ObjectInfo> cloudObjects) |
716 |
{ |
717 |
DateTime? maxDate = null; |
718 |
if (cloudObjects!=null && cloudObjects.Count > 0) |
719 |
maxDate = cloudObjects.Max(obj => obj.Last_Modified); |
720 |
if (maxDate == null || maxDate == DateTime.MinValue) |
721 |
return threshold; |
722 |
if (threshold == null || threshold == DateTime.MinValue || threshold < maxDate) |
723 |
return maxDate; |
724 |
return threshold; |
725 |
} |
726 |
|
727 |
//readonly AccountsDifferencer _differencer = new AccountsDifferencer(); |
728 |
private Dictionary<Uri, List<Uri>> _selectiveUris = new Dictionary<Uri, List<Uri>>(); |
729 |
private bool _pause; |
730 |
private static string MERKLE_EMPTY = "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"; |
731 |
|
732 |
/// <summary> |
733 |
/// Deletes local files that are not found in the list of cloud files |
734 |
/// </summary> |
735 |
/// <param name="accountInfo"></param> |
736 |
/// <param name="cloudFiles"></param> |
737 |
private void ProcessDeletedFiles(AccountInfo accountInfo, IEnumerable<ObjectInfo> cloudFiles) |
738 |
{ |
739 |
if (accountInfo == null) |
740 |
throw new ArgumentNullException("accountInfo"); |
741 |
if (String.IsNullOrWhiteSpace(accountInfo.AccountPath)) |
742 |
throw new ArgumentException("The AccountInfo.AccountPath is empty", "accountInfo"); |
743 |
if (cloudFiles == null) |
744 |
throw new ArgumentNullException("cloudFiles"); |
745 |
Contract.EndContractBlock(); |
746 |
|
747 |
var deletedFiles = new List<FileSystemInfo>(); |
748 |
foreach (var objectInfo in cloudFiles) |
749 |
{ |
750 |
if (Log.IsDebugEnabled) |
751 |
Log.DebugFormat("Handle deleted [{0}]", objectInfo.Uri); |
752 |
var relativePath = objectInfo.RelativeUrlToFilePath(accountInfo.UserName); |
753 |
var item = FileAgent.GetFileAgent(accountInfo).GetFileSystemInfo(relativePath); |
754 |
if (Log.IsDebugEnabled) |
755 |
Log.DebugFormat("Will delete [{0}] for [{1}]", item.FullName, objectInfo.Uri); |
756 |
if (item.Exists) |
757 |
{ |
758 |
if ((item.Attributes & FileAttributes.ReadOnly) == FileAttributes.ReadOnly) |
759 |
{ |
760 |
item.Attributes = item.Attributes & ~FileAttributes.ReadOnly; |
761 |
|
762 |
} |
763 |
|
764 |
|
765 |
Log.DebugFormat("Deleting {0}", item.FullName); |
766 |
|
767 |
var directory = item as DirectoryInfo; |
768 |
if (directory != null) |
769 |
directory.Delete(true); |
770 |
else |
771 |
item.Delete(); |
772 |
Log.DebugFormat("Deleted [{0}] for [{1}]", item.FullName, objectInfo.Uri); |
773 |
DateTime lastDate; |
774 |
_lastSeen.TryRemove(item.FullName, out lastDate); |
775 |
deletedFiles.Add(item); |
776 |
} |
777 |
StatusKeeper.SetFileState(item.FullName, FileStatus.Deleted, FileOverlayStatus.Deleted, "File Deleted"); |
778 |
} |
779 |
Log.InfoFormat("[{0}] files were deleted", deletedFiles.Count); |
780 |
StatusNotification.NotifyForFiles(deletedFiles, String.Format("{0} files were deleted", deletedFiles.Count), |
781 |
TraceLevel.Info); |
782 |
|
783 |
} |
784 |
|
785 |
private void MarkSuspectedDeletes(AccountInfo accountInfo, IEnumerable<ObjectInfo> cloudFiles) |
786 |
{ |
787 |
//Only consider files that are not being modified, ie they are in the Unchanged state |
788 |
var deleteCandidates = FileState.Queryable.Where(state => |
789 |
state.FilePath.StartsWith(accountInfo.AccountPath) |
790 |
&& state.FileStatus == FileStatus.Unchanged).ToList(); |
791 |
|
792 |
|
793 |
//TODO: filesToDelete must take into account the Others container |
794 |
var filesToDelete = (from deleteCandidate in deleteCandidates |
795 |
let localFile = FileInfoExtensions.FromPath(deleteCandidate.FilePath) |
796 |
let relativeFilePath = localFile.AsRelativeTo(accountInfo.AccountPath) |
797 |
where |
798 |
!cloudFiles.Any(r => r.RelativeUrlToFilePath(accountInfo.UserName) == relativeFilePath) |
799 |
select localFile).ToList(); |
800 |
|
801 |
|
802 |
//Set the status of missing files to Conflict |
803 |
foreach (var item in filesToDelete) |
804 |
{ |
805 |
//Try to acquire a gate on the file, to take into account files that have been dequeued |
806 |
//and are being processed |
807 |
using (var gate = NetworkGate.Acquire(item.FullName, NetworkOperation.Deleting)) |
808 |
{ |
809 |
if (gate.Failed) |
810 |
continue; |
811 |
StatusKeeper.SetFileState(item.FullName, FileStatus.Conflict, FileOverlayStatus.Deleted, |
812 |
"Local file missing from server"); |
813 |
} |
814 |
} |
815 |
UpdateStatus(PithosStatus.HasConflicts); |
816 |
StatusNotification.NotifyConflicts(filesToDelete, |
817 |
String.Format( |
818 |
"{0} local files are missing from Pithos, possibly because they were deleted", |
819 |
filesToDelete.Count)); |
820 |
StatusNotification.NotifyForFiles(filesToDelete, String.Format("{0} files were deleted", filesToDelete.Count), |
821 |
TraceLevel.Info); |
822 |
} |
823 |
|
824 |
private void ReportConflictForMismatch(string localFilePath) |
825 |
{ |
826 |
if (String.IsNullOrWhiteSpace(localFilePath)) |
827 |
throw new ArgumentNullException("localFilePath"); |
828 |
Contract.EndContractBlock(); |
829 |
|
830 |
StatusKeeper.SetFileState(localFilePath, FileStatus.Conflict, FileOverlayStatus.Conflict, "File changed at the server"); |
831 |
UpdateStatus(PithosStatus.HasConflicts); |
832 |
var message = String.Format("Conflict detected for file {0}", localFilePath); |
833 |
Log.Warn(message); |
834 |
StatusNotification.NotifyChange(message, TraceLevel.Warning); |
835 |
} |
836 |
|
837 |
|
838 |
|
839 |
/// <summary> |
840 |
/// Creates a Sync action for each changed server file |
841 |
/// </summary> |
842 |
/// <param name="accountInfo"></param> |
843 |
/// <param name="changes"></param> |
844 |
/// <returns></returns> |
845 |
private IEnumerable<CloudAction> ChangesToActions(AccountInfo accountInfo, IEnumerable<ObjectInfo> changes) |
846 |
{ |
847 |
if (changes == null) |
848 |
throw new ArgumentNullException(); |
849 |
Contract.EndContractBlock(); |
850 |
var fileAgent = FileAgent.GetFileAgent(accountInfo); |
851 |
|
852 |
//In order to avoid multiple iterations over the files, we iterate only once |
853 |
//over the remote files |
854 |
foreach (var objectInfo in changes) |
855 |
{ |
856 |
var relativePath = objectInfo.RelativeUrlToFilePath(accountInfo.UserName); |
857 |
//If a directory object already exists, we may need to sync it |
858 |
if (fileAgent.Exists(relativePath)) |
859 |
{ |
860 |
var localFile = fileAgent.GetFileSystemInfo(relativePath); |
861 |
//We don't need to sync directories |
862 |
if (objectInfo.IsDirectory && localFile is DirectoryInfo) |
863 |
continue; |
864 |
using (new SessionScope(FlushAction.Never)) |
865 |
{ |
866 |
var state = StatusKeeper.GetStateByFilePath(localFile.FullName); |
867 |
_lastSeen[localFile.FullName] = DateTime.Now; |
868 |
//Common files should be checked on a per-case basis to detect differences, which is newer |
869 |
|
870 |
yield return new CloudAction(accountInfo, CloudActionType.MustSynch, |
871 |
localFile, objectInfo, state, accountInfo.BlockSize, |
872 |
accountInfo.BlockHash,"Poll Changes"); |
873 |
} |
874 |
} |
875 |
else |
876 |
{ |
877 |
//Remote files should be downloaded |
878 |
yield return new CloudDownloadAction(accountInfo, objectInfo,"Poll Changes"); |
879 |
} |
880 |
} |
881 |
} |
882 |
|
883 |
/// <summary> |
884 |
/// Creates a Local Move action for each moved server file |
885 |
/// </summary> |
886 |
/// <param name="accountInfo"></param> |
887 |
/// <param name="moves"></param> |
888 |
/// <returns></returns> |
889 |
private IEnumerable<CloudAction> MovesToActions(AccountInfo accountInfo, IEnumerable<ObjectInfo> moves) |
890 |
{ |
891 |
if (moves == null) |
892 |
throw new ArgumentNullException(); |
893 |
Contract.EndContractBlock(); |
894 |
var fileAgent = FileAgent.GetFileAgent(accountInfo); |
895 |
|
896 |
//In order to avoid multiple iterations over the files, we iterate only once |
897 |
//over the remote files |
898 |
foreach (var objectInfo in moves) |
899 |
{ |
900 |
var previousRelativepath = objectInfo.Previous.RelativeUrlToFilePath(accountInfo.UserName); |
901 |
//If the previous file already exists, we can execute a Move operation |
902 |
if (fileAgent.Exists(previousRelativepath)) |
903 |
{ |
904 |
var previousFile = fileAgent.GetFileSystemInfo(previousRelativepath); |
905 |
using (new SessionScope(FlushAction.Never)) |
906 |
{ |
907 |
var state = StatusKeeper.GetStateByFilePath(previousFile.FullName); |
908 |
_lastSeen[previousFile.FullName] = DateTime.Now; |
909 |
|
910 |
//For each moved object we need to move both the local file and update |
911 |
yield return new CloudAction(accountInfo, CloudActionType.RenameLocal, |
912 |
previousFile, objectInfo, state, accountInfo.BlockSize, |
913 |
accountInfo.BlockHash,"Poll Moves"); |
914 |
//For modified files, we need to download the changes as well |
915 |
if (objectInfo.X_Object_Hash != objectInfo.PreviousHash) |
916 |
yield return new CloudDownloadAction(accountInfo,objectInfo, "Poll Moves"); |
917 |
} |
918 |
} |
919 |
//If the previous file does not exist, we need to download it in the new location |
920 |
else |
921 |
{ |
922 |
//Remote files should be downloaded |
923 |
yield return new CloudDownloadAction(accountInfo, objectInfo, "Poll Moves"); |
924 |
} |
925 |
} |
926 |
} |
927 |
|
928 |
|
929 |
/// <summary> |
930 |
/// Creates a download action for each new server file |
931 |
/// </summary> |
932 |
/// <param name="accountInfo"></param> |
933 |
/// <param name="creates"></param> |
934 |
/// <returns></returns> |
935 |
private IEnumerable<CloudAction> CreatesToActions(AccountInfo accountInfo, IEnumerable<ObjectInfo> creates) |
936 |
{ |
937 |
if (creates == null) |
938 |
throw new ArgumentNullException(); |
939 |
Contract.EndContractBlock(); |
940 |
var fileAgent = FileAgent.GetFileAgent(accountInfo); |
941 |
|
942 |
//In order to avoid multiple iterations over the files, we iterate only once |
943 |
//over the remote files |
944 |
foreach (var objectInfo in creates) |
945 |
{ |
946 |
if (Log.IsDebugEnabled) |
947 |
Log.DebugFormat("[NEW INFO] {0}",objectInfo.Uri); |
948 |
|
949 |
var relativePath = objectInfo.RelativeUrlToFilePath(accountInfo.UserName); |
950 |
|
951 |
//If the object already exists, we should check before uploading or downloading |
952 |
if (fileAgent.Exists(relativePath)) |
953 |
{ |
954 |
var localFile= fileAgent.GetFileSystemInfo(relativePath); |
955 |
var state = StatusKeeper.GetStateByFilePath(localFile.WithProperCapitalization().FullName); |
956 |
yield return new CloudAction(accountInfo, CloudActionType.MustSynch, |
957 |
localFile, objectInfo, state, accountInfo.BlockSize, |
958 |
accountInfo.BlockHash,"Poll Creates"); |
959 |
} |
960 |
else |
961 |
{ |
962 |
//Remote files should be downloaded |
963 |
yield return new CloudDownloadAction(accountInfo, objectInfo,"Poll Creates"); |
964 |
} |
965 |
|
966 |
} |
967 |
} |
968 |
|
969 |
/// <summary> |
970 |
/// Notify the UI to update the visual status |
971 |
/// </summary> |
972 |
/// <param name="status"></param> |
973 |
private void UpdateStatus(PithosStatus status) |
974 |
{ |
975 |
try |
976 |
{ |
977 |
StatusNotification.SetPithosStatus(status); |
978 |
//StatusNotification.Notify(new Notification()); |
979 |
} |
980 |
catch (Exception exc) |
981 |
{ |
982 |
//Failure is not critical, just log it |
983 |
Log.Warn("Error while updating status", exc); |
984 |
} |
985 |
} |
986 |
|
987 |
private static void CreateContainerFolders(AccountInfo accountInfo, IEnumerable<ContainerInfo> containers) |
988 |
{ |
989 |
var containerPaths = from container in containers |
990 |
let containerPath = Path.Combine(accountInfo.AccountPath, container.Name) |
991 |
where container.Name != FolderConstants.TrashContainer && !Directory.Exists(containerPath) |
992 |
select containerPath; |
993 |
|
994 |
foreach (var path in containerPaths) |
995 |
{ |
996 |
Directory.CreateDirectory(path); |
997 |
} |
998 |
} |
999 |
|
1000 |
public void AddAccount(AccountInfo accountInfo) |
1001 |
{ |
1002 |
//Avoid adding a duplicate accountInfo |
1003 |
_accounts.TryAdd(accountInfo.AccountKey, accountInfo); |
1004 |
} |
1005 |
|
1006 |
public void RemoveAccount(AccountInfo accountInfo) |
1007 |
{ |
1008 |
AccountInfo account; |
1009 |
_accounts.TryRemove(accountInfo.AccountKey, out account); |
1010 |
/* |
1011 |
SnapshotDifferencer differencer; |
1012 |
_differencer.Differencers.TryRemove(accountInfo.AccountKey, out differencer); |
1013 |
*/ |
1014 |
} |
1015 |
|
1016 |
public void SetSelectivePaths(AccountInfo accountInfo,Uri[] added, Uri[] removed) |
1017 |
{ |
1018 |
AbortRemovedPaths(accountInfo,removed); |
1019 |
DownloadNewPaths(accountInfo,added); |
1020 |
} |
1021 |
|
1022 |
private void DownloadNewPaths(AccountInfo accountInfo, Uri[] added) |
1023 |
{ |
1024 |
var client = new CloudFilesClient(accountInfo); |
1025 |
foreach (var folderUri in added) |
1026 |
{ |
1027 |
try |
1028 |
{ |
1029 |
|
1030 |
string account; |
1031 |
string container; |
1032 |
var segmentsCount = folderUri.Segments.Length; |
1033 |
//Is this an account URL? |
1034 |
if (segmentsCount < 3) |
1035 |
continue; |
1036 |
//Is this a container or folder URL? |
1037 |
if (segmentsCount == 3) |
1038 |
{ |
1039 |
account = folderUri.Segments[1].TrimEnd('/'); |
1040 |
container = folderUri.Segments[2].TrimEnd('/'); |
1041 |
} |
1042 |
else |
1043 |
{ |
1044 |
account = folderUri.Segments[2].TrimEnd('/'); |
1045 |
container = folderUri.Segments[3].TrimEnd('/'); |
1046 |
} |
1047 |
IList<ObjectInfo> items; |
1048 |
if (segmentsCount > 3) |
1049 |
{ |
1050 |
//List folder |
1051 |
var folder = String.Join("", folderUri.Segments.Splice(4)); |
1052 |
items = client.ListObjects(account, container, folder); |
1053 |
} |
1054 |
else |
1055 |
{ |
1056 |
//List container |
1057 |
items = client.ListObjects(account, container); |
1058 |
} |
1059 |
var actions = CreatesToActions(accountInfo, items); |
1060 |
foreach (var action in actions) |
1061 |
{ |
1062 |
NetworkAgent.Post(action); |
1063 |
} |
1064 |
} |
1065 |
catch (Exception exc) |
1066 |
{ |
1067 |
Log.WarnFormat("Listing of new selective path [{0}] failed with \r\n{1}", folderUri, exc); |
1068 |
} |
1069 |
} |
1070 |
|
1071 |
//Need to get a listing of each of the URLs, then post them to the NetworkAgent |
1072 |
//CreatesToActions(accountInfo,) |
1073 |
|
1074 |
/* NetworkAgent.Post();*/ |
1075 |
} |
1076 |
|
1077 |
private void AbortRemovedPaths(AccountInfo accountInfo, Uri[] removed) |
1078 |
{ |
1079 |
/*this.NetworkAgent.*/ |
1080 |
} |
1081 |
} |
1082 |
} |