root / trunk / Pithos.Core / Agents / PollAgent.cs @ c945b450
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#region |
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/* ----------------------------------------------------------------------- |
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* <copyright file="PollAgent.cs" company="GRNet"> |
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* |
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* Copyright 2011-2012 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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* |
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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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*/ |
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#endregion |
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|
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using System.Collections.Concurrent; |
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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.Expressions; |
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using System.Reflection; |
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using System.Threading; |
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using System.Threading.Tasks; |
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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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|
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namespace Pithos.Core.Agents |
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{ |
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using System; |
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using System.Collections.Generic; |
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using System.Linq; |
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|
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[DebuggerDisplay("{FilePath} C:{C} L:{L} S:{S}")] |
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public class StateTuple |
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{ |
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public string FilePath { get; private set; } |
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|
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public string L |
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{ |
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get { return FileState==null?null:FileState.Checksum; } |
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} |
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|
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public string C { get; set; } |
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|
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public string S |
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{ |
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get { return ObjectInfo== null ? null : ObjectInfo.Hash; } |
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} |
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|
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private FileSystemInfo _fileInfo; |
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public FileSystemInfo FileInfo |
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{ |
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get { return _fileInfo; } |
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set |
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{ |
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_fileInfo = value; |
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FilePath = value.FullName; |
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} |
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} |
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|
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public FileState FileState { get; set; } |
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public ObjectInfo ObjectInfo{ get; set; } |
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|
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public StateTuple() { } |
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|
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public StateTuple(FileSystemInfo info) |
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{ |
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FileInfo = info; |
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} |
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|
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|
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} |
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|
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|
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/// <summary> |
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/// PollAgent periodically polls the server to detect object changes. The agent retrieves a listing of all |
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/// objects and compares it with a previously cached version to detect differences. |
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/// New files are downloaded, missing files are deleted from the local file system and common files are compared |
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/// to determine the appropriate action |
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/// </summary> |
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[Export] |
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public class PollAgent |
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{ |
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private static readonly ILog Log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType); |
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|
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[System.ComponentModel.Composition.Import] |
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public IStatusKeeper StatusKeeper { get; set; } |
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|
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[System.ComponentModel.Composition.Import] |
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public IPithosSettings Settings { get; set; } |
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|
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[System.ComponentModel.Composition.Import] |
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public NetworkAgent NetworkAgent { get; set; } |
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|
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[System.ComponentModel.Composition.Import] |
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public Selectives Selectives { get; set; } |
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|
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public IStatusNotification StatusNotification { get; set; } |
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|
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private CancellationTokenSource _currentOperationCancellation = new CancellationTokenSource(); |
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|
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public void CancelCurrentOperation() |
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{ |
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//What does it mean to cancel the current upload/download? |
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//Obviously, the current operation will be cancelled by throwing |
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//a cancellation exception. |
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// |
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//The default behavior is to retry any operations that throw. |
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//Obviously this is not what we want in this situation. |
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//The cancelled operation should NOT bea retried. |
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// |
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//This can be done by catching the cancellation exception |
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//and avoiding the retry. |
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// |
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|
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//Have to reset the cancellation source - it is not possible to reset the source |
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//Have to prevent a case where an operation requests a token from the old source |
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var oldSource = Interlocked.Exchange(ref _currentOperationCancellation, new CancellationTokenSource()); |
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oldSource.Cancel(); |
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|
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} |
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|
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public bool Pause |
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{ |
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get { |
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return _pause; |
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} |
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set { |
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_pause = value; |
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if (!_pause) |
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_unPauseEvent.Set(); |
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else |
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{ |
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_unPauseEvent.Reset(); |
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} |
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} |
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} |
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|
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private bool _firstPoll = true; |
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|
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//The Sync Event signals a manual synchronisation |
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private readonly AsyncManualResetEvent _syncEvent = new AsyncManualResetEvent(); |
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|
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private readonly AsyncManualResetEvent _unPauseEvent = new AsyncManualResetEvent(true); |
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|
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private readonly ConcurrentDictionary<string, DateTime> _lastSeen = new ConcurrentDictionary<string, DateTime>(); |
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private readonly ConcurrentDictionary<Uri, AccountInfo> _accounts = new ConcurrentDictionary<Uri,AccountInfo>(); |
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|
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|
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/// <summary> |
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/// Start a manual synchronization |
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/// </summary> |
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public void SynchNow() |
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{ |
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_syncEvent.Set(); |
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} |
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|
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|
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/// <summary> |
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/// Remote files are polled periodically. Any changes are processed |
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/// </summary> |
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/// <param name="since"></param> |
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/// <returns></returns> |
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public async Task PollRemoteFiles(DateTime? since = null) |
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{ |
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if (Log.IsDebugEnabled) |
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Log.DebugFormat("Polling changes after [{0}]",since); |
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|
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Debug.Assert(Thread.CurrentThread.IsBackground, "Polling Ended up in the main thread!"); |
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|
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//GC.Collect(); |
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|
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using (ThreadContext.Stacks["Retrieve Remote"].Push("All accounts")) |
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{ |
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//If this poll fails, we will retry with the same since value |
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var nextSince = since; |
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try |
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{ |
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await _unPauseEvent.WaitAsync(); |
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UpdateStatus(PithosStatus.PollSyncing); |
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|
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var tasks = from accountInfo in _accounts.Values |
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select ProcessAccountFiles(accountInfo, since); |
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|
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var nextTimes=await TaskEx.WhenAll(tasks.ToList()); |
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|
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_firstPoll = false; |
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//Reschedule the poll with the current timestamp as a "since" value |
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|
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if (nextTimes.Length>0) |
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nextSince = nextTimes.Min(); |
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if (Log.IsDebugEnabled) |
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Log.DebugFormat("Next Poll at [{0}]",nextSince); |
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} |
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catch (Exception ex) |
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{ |
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Log.ErrorFormat("Error while processing accounts\r\n{0}", ex); |
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//In case of failure retry with the same "since" value |
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} |
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|
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UpdateStatus(PithosStatus.PollComplete); |
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//The multiple try blocks are required because we can't have an await call |
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//inside a finally block |
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//TODO: Find a more elegant solution for reschedulling in the event of an exception |
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try |
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{ |
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//Wait for the polling interval to pass or the Sync event to be signalled |
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nextSince = await WaitForScheduledOrManualPoll(nextSince); |
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} |
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finally |
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{ |
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//Ensure polling is scheduled even in case of error |
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TaskEx.Run(() => PollRemoteFiles(nextSince)); |
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} |
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} |
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} |
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|
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/// <summary> |
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/// Wait for the polling period to expire or a manual sync request |
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/// </summary> |
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/// <param name="since"></param> |
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/// <returns></returns> |
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private async Task<DateTime?> WaitForScheduledOrManualPoll(DateTime? since) |
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{ |
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var sync = _syncEvent.WaitAsync(); |
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var wait = TaskEx.Delay(TimeSpan.FromSeconds(Settings.PollingInterval), NetworkAgent.CancellationToken); |
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|
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var signaledTask = await TaskEx.WhenAny(sync, wait); |
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|
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//Pausing takes precedence over manual sync or awaiting |
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_unPauseEvent.Wait(); |
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|
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//Wait for network processing to finish before polling |
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var pauseTask=NetworkAgent.ProceedEvent.WaitAsync(); |
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await TaskEx.WhenAll(signaledTask, pauseTask); |
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|
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//If polling is signalled by SynchNow, ignore the since tag |
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if (sync.IsCompleted) |
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{ |
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//TODO: Must convert to AutoReset |
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_syncEvent.Reset(); |
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return null; |
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} |
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return since; |
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} |
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|
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public async Task<DateTime?> ProcessAccountFiles(AccountInfo accountInfo, DateTime? since = null) |
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{ |
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if (accountInfo == null) |
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throw new ArgumentNullException("accountInfo"); |
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if (String.IsNullOrWhiteSpace(accountInfo.AccountPath)) |
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throw new ArgumentException("The AccountInfo.AccountPath is empty", "accountInfo"); |
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Contract.EndContractBlock(); |
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|
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|
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using (ThreadContext.Stacks["Retrieve Remote"].Push(accountInfo.UserName)) |
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{ |
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|
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await NetworkAgent.GetDeleteAwaiter(); |
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|
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Log.Info("Scheduled"); |
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var client = new CloudFilesClient(accountInfo); |
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|
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//We don't need to check the trash container |
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var containers = client.ListContainers(accountInfo.UserName) |
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.Where(c=>c.Name!="trash") |
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.ToList(); |
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|
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|
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CreateContainerFolders(accountInfo, containers); |
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|
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//The nextSince time fallback time is the same as the current. |
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//If polling succeeds, the next Since time will be the smallest of the maximum modification times |
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//of the shared and account objects |
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var nextSince = since; |
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|
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try |
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{ |
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//Wait for any deletions to finish |
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await NetworkAgent.GetDeleteAwaiter(); |
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//Get the poll time now. We may miss some deletions but it's better to keep a file that was deleted |
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//than delete a file that was created while we were executing the poll |
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|
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//Get the list of server objects changed since the last check |
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//The name of the container is passed as state in order to create a dictionary of tasks in a subsequent step |
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var listObjects = (from container in containers |
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select Task<IList<ObjectInfo>>.Factory.StartNew(_ => |
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client.ListObjects(accountInfo.UserName, container.Name, since), container.Name)).ToList(); |
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|
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var listShared = Task<IList<ObjectInfo>>.Factory.StartNew(_ => |
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client.ListSharedObjects(since), "shared"); |
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listObjects.Add(listShared); |
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var listTasks = await Task.Factory.WhenAll(listObjects.ToArray()); |
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|
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using (ThreadContext.Stacks["SCHEDULE"].Push("Process Results")) |
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{ |
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var dict = listTasks.ToDictionary(t => t.AsyncState); |
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|
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//Get all non-trash objects. Remember, the container name is stored in AsyncState |
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var remoteObjects = (from objectList in listTasks |
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where (string)objectList.AsyncState != "trash" |
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from obj in objectList.Result |
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orderby obj.Bytes ascending |
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select obj).ToList(); |
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|
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//Get the latest remote object modification date, only if it is after |
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//the original since date |
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nextSince = GetLatestDateAfter(nextSince, remoteObjects); |
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|
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var sharedObjects = dict["shared"].Result; |
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nextSince = GetLatestDateBefore(nextSince, sharedObjects); |
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|
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//DON'T process trashed files |
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//If some files are deleted and added again to a folder, they will be deleted |
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//even though they are new. |
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//We would have to check file dates and hashes to ensure that a trashed file |
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//can be deleted safely from the local hard drive. |
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/* |
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//Items with the same name, hash may be both in the container and the trash |
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//Don't delete items that exist in the container |
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var realTrash = from trash in trashObjects |
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where |
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!remoteObjects.Any( |
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info => info.Name == trash.Name && info.Hash == trash.Hash) |
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select trash; |
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ProcessTrashedFiles(accountInfo, realTrash); |
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*/ |
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|
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var cleanRemotes = (from info in remoteObjects.Union(sharedObjects) |
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let name = info.Name??"" |
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where !name.EndsWith(".ignore", StringComparison.InvariantCultureIgnoreCase) && |
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!name.StartsWith(FolderConstants.CacheFolder + "/", |
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StringComparison.InvariantCultureIgnoreCase) |
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select info).ToList(); |
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|
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if (_firstPoll) |
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StatusKeeper.CleanupOrphanStates(); |
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StatusKeeper.CleanupStaleStates(accountInfo, cleanRemotes); |
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|
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//var differencer = _differencer.PostSnapshot(accountInfo, cleanRemotes); |
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|
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var filterUris = Selectives.SelectiveUris[accountInfo.AccountKey]; |
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|
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|
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//Get the local files here |
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var agent = AgentLocator<FileAgent>.Get(accountInfo.AccountPath); |
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|
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var files = LoadLocalFileTuples(accountInfo); |
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|
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var states = FileState.Queryable.ToList(); |
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|
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var infos = (from remote in cleanRemotes |
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let path = remote.RelativeUrlToFilePath(accountInfo.UserName) |
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let info=agent.GetFileSystemInfo(path) |
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select Tuple.Create(info.FullName,remote)) |
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.ToList(); |
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|
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var token = _currentOperationCancellation.Token; |
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|
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var tuples = MergeSources(infos, files, states).ToList(); |
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|
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|
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foreach (var tuple in tuples) |
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{ |
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await _unPauseEvent.WaitAsync(); |
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|
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SyncSingleItem(accountInfo, tuple, agent, token); |
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} |
399 |
|
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|
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//On the first run |
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/* |
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if (_firstPoll) |
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{ |
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MarkSuspectedDeletes(accountInfo, cleanRemotes); |
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} |
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*/ |
408 |
|
409 |
|
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Log.Info("[LISTENER] End Processing"); |
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} |
412 |
} |
413 |
catch (Exception ex) |
414 |
{ |
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Log.ErrorFormat("[FAIL] ListObjects for{0} in ProcessRemoteFiles with {1}", accountInfo.UserName, ex); |
416 |
return nextSince; |
417 |
} |
418 |
|
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Log.Info("[LISTENER] Finished"); |
420 |
return nextSince; |
421 |
} |
422 |
} |
423 |
|
424 |
private static List<Tuple<FileSystemInfo, string>> LoadLocalFileTuples(AccountInfo accountInfo) |
425 |
{ |
426 |
using (ThreadContext.Stacks["Account Files Hashing"].Push(accountInfo.UserName)) |
427 |
{ |
428 |
|
429 |
var localInfos = AgentLocator<FileAgent>.Get(accountInfo.AccountPath).EnumerateFileSystemInfos(); |
430 |
//Use the queue to retry locked file hashing |
431 |
var fileQueue = new Queue<FileSystemInfo>(localInfos); |
432 |
|
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var results = new List<Tuple<FileSystemInfo, string>>(); |
434 |
|
435 |
while (fileQueue.Count > 0) |
436 |
{ |
437 |
var file = fileQueue.Dequeue(); |
438 |
using (ThreadContext.Stacks["File"].Push(file.FullName)) |
439 |
{ |
440 |
try |
441 |
{ |
442 |
var hash = (file is DirectoryInfo) |
443 |
? "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855" |
444 |
: Signature.CalculateTreeHash(file, accountInfo.BlockSize, |
445 |
accountInfo.BlockHash) |
446 |
. |
447 |
TopHash.ToHashString(); |
448 |
results.Add(Tuple.Create(file, hash)); |
449 |
} |
450 |
catch (IOException exc) |
451 |
{ |
452 |
Log.WarnFormat("[HASH] File in use, will retry [{0}]", exc); |
453 |
fileQueue.Enqueue(file); |
454 |
} |
455 |
} |
456 |
} |
457 |
|
458 |
return results; |
459 |
} |
460 |
} |
461 |
|
462 |
private void SyncSingleItem(AccountInfo accountInfo, StateTuple tuple, FileAgent agent, CancellationToken token) |
463 |
{ |
464 |
Log.DebugFormat("Sync [{0}] C:[{1}] L:[{2}] S:[{3}]",tuple.FilePath,tuple.C,tuple.L,tuple.S); |
465 |
|
466 |
var localFilePath = tuple.FilePath; |
467 |
//Don't use the tuple info, it may have been deleted |
468 |
var localInfo = FileInfoExtensions.FromPath(localFilePath); |
469 |
|
470 |
// Local file unchanged? If both C and L are null, make sure it's because |
471 |
//both the file is missing and the state checksum is not missing |
472 |
if (tuple.C == tuple.L && (localInfo.Exists || tuple.FileState==null)) |
473 |
{ |
474 |
//No local changes |
475 |
//Server unchanged? |
476 |
if (tuple.S == tuple.L) |
477 |
{ |
478 |
// No server changes |
479 |
; |
480 |
} |
481 |
else |
482 |
{ |
483 |
//Different from server |
484 |
if (Selectives.IsSelected(accountInfo, localFilePath)) |
485 |
{ |
486 |
//Does the server file exist? |
487 |
if (tuple.S == null) |
488 |
{ |
489 |
//Server file doesn't exist |
490 |
//deleteObjectFromLocal() |
491 |
StatusKeeper.SetFileState(localFilePath, FileStatus.Deleted, |
492 |
FileOverlayStatus.Deleted, ""); |
493 |
agent.Delete(localFilePath); |
494 |
//updateRecord(Remove C, L) |
495 |
StatusKeeper.ClearFileStatus(localFilePath); |
496 |
} |
497 |
else |
498 |
{ |
499 |
//Server file exists |
500 |
//downloadServerObject() // Result: L = S |
501 |
StatusKeeper.SetFileState(localFilePath, FileStatus.Modified, |
502 |
FileOverlayStatus.Modified, ""); |
503 |
NetworkAgent.Downloader.DownloadCloudFile(accountInfo, |
504 |
tuple.ObjectInfo, |
505 |
localFilePath, token).Wait(token); |
506 |
//updateRecord( L = S ) |
507 |
StatusKeeper.UpdateFileChecksum(localFilePath, tuple.FileState==null?"":tuple.FileState.ShortHash, |
508 |
tuple.ObjectInfo.Hash); |
509 |
|
510 |
StatusKeeper.SetFileState(localFilePath, FileStatus.Unchanged, |
511 |
FileOverlayStatus.Normal, ""); |
512 |
} |
513 |
} |
514 |
} |
515 |
} |
516 |
else |
517 |
{ |
518 |
//Local changes found |
519 |
|
520 |
//Server unchanged? |
521 |
if (tuple.S == tuple.L) |
522 |
{ |
523 |
//The FileAgent selective sync checks for new root folder files |
524 |
if (!agent.Ignore(localFilePath)) |
525 |
{ |
526 |
if ((tuple.C == null || !localInfo.Exists) && tuple.ObjectInfo != null) |
527 |
{ |
528 |
//deleteObjectFromServer() |
529 |
DeleteCloudFile(accountInfo, tuple); |
530 |
//updateRecord( Remove L, S) |
531 |
} |
532 |
else |
533 |
{ |
534 |
//uploadLocalObject() // Result: S = C, L = S |
535 |
var isUnselected = agent.IsUnselectedRootFolder(tuple.FilePath); |
536 |
|
537 |
//Debug.Assert(tuple.FileState !=null); |
538 |
var action = new CloudUploadAction(accountInfo, localInfo, tuple.FileState, |
539 |
accountInfo.BlockSize, accountInfo.BlockHash, |
540 |
"Poll", isUnselected); |
541 |
NetworkAgent.Uploader.UploadCloudFile(action, token).Wait(token); |
542 |
|
543 |
|
544 |
//updateRecord( S = C ) |
545 |
StatusKeeper.SetFileState(localFilePath, FileStatus.Unchanged, |
546 |
FileOverlayStatus.Normal, ""); |
547 |
if (isUnselected) |
548 |
{ |
549 |
ProcessChildren(accountInfo, tuple, agent, token); |
550 |
} |
551 |
} |
552 |
} |
553 |
} |
554 |
else |
555 |
{ |
556 |
if (Selectives.IsSelected(accountInfo, localFilePath)) |
557 |
{ |
558 |
if (tuple.C == tuple.S) |
559 |
{ |
560 |
// (Identical Changes) Result: L = S |
561 |
//doNothing() |
562 |
StatusKeeper.UpdateFileChecksum(localFilePath, tuple.FileState == null ? "" : tuple.FileState.ShortHash, |
563 |
tuple.ObjectInfo.Hash); |
564 |
StatusKeeper.SetFileState(localFilePath, FileStatus.Unchanged, |
565 |
FileOverlayStatus.Normal, ""); |
566 |
} |
567 |
else |
568 |
{ |
569 |
if ((tuple.C == null || !localInfo.Exists) && tuple.ObjectInfo != null ) |
570 |
{ |
571 |
//deleteObjectFromServer() |
572 |
DeleteCloudFile(accountInfo, tuple); |
573 |
//updateRecord(Remove L, S) |
574 |
} |
575 |
else |
576 |
{ |
577 |
ReportConflictForMismatch(localFilePath); |
578 |
//identifyAsConflict() // Manual action required |
579 |
} |
580 |
} |
581 |
} |
582 |
} |
583 |
} |
584 |
} |
585 |
|
586 |
private void DeleteCloudFile(AccountInfo accountInfo, StateTuple tuple) |
587 |
{ |
588 |
StatusKeeper.SetFileState(tuple.FilePath, FileStatus.Deleted, |
589 |
FileOverlayStatus.Deleted, ""); |
590 |
NetworkAgent.DeleteAgent.DeleteCloudFile(accountInfo, tuple.ObjectInfo); |
591 |
StatusKeeper.ClearFileStatus(tuple.FilePath); |
592 |
} |
593 |
|
594 |
private void ProcessChildren(AccountInfo accountInfo, StateTuple tuple, FileAgent agent, CancellationToken token) |
595 |
{ |
596 |
|
597 |
var dirInfo = tuple.FileInfo as DirectoryInfo; |
598 |
var folderTuples = from folder in dirInfo.EnumerateDirectories("*", SearchOption.AllDirectories) |
599 |
select new StateTuple(folder); |
600 |
var fileTuples = from file in dirInfo.EnumerateFiles("*", SearchOption.AllDirectories) |
601 |
select new StateTuple(file); |
602 |
|
603 |
//Process folders first, to ensure folders appear on the sever as soon as possible |
604 |
folderTuples.ApplyAction(t => SyncSingleItem(accountInfo, t, agent, token)); |
605 |
|
606 |
fileTuples.ApplyAction(t => SyncSingleItem(accountInfo, t, agent, token)); |
607 |
} |
608 |
|
609 |
private static IEnumerable<StateTuple> MergeSources( |
610 |
IEnumerable<Tuple<string, ObjectInfo>> infos, |
611 |
IEnumerable<Tuple<FileSystemInfo, string>> files, |
612 |
IEnumerable<FileState> states) |
613 |
{ |
614 |
var dct = new Dictionary<string, StateTuple>(); |
615 |
foreach (var file in files) |
616 |
{ |
617 |
var fsInfo = file.Item1; |
618 |
var fileHash = file.Item2; |
619 |
dct[fsInfo.FullName] = new StateTuple {FileInfo = fsInfo, C = fileHash}; |
620 |
} |
621 |
foreach (var state in states) |
622 |
{ |
623 |
StateTuple hashTuple; |
624 |
if (dct.TryGetValue(state.FilePath, out hashTuple)) |
625 |
{ |
626 |
hashTuple.FileState = state; |
627 |
} |
628 |
else |
629 |
{ |
630 |
var fsInfo = FileInfoExtensions.FromPath(state.FilePath); |
631 |
dct[state.FilePath] = new StateTuple {FileInfo = fsInfo, FileState = state}; |
632 |
} |
633 |
} |
634 |
foreach (var info in infos) |
635 |
{ |
636 |
StateTuple hashTuple; |
637 |
var filePath = info.Item1; |
638 |
var objectInfo = info.Item2; |
639 |
if (dct.TryGetValue(filePath, out hashTuple)) |
640 |
{ |
641 |
hashTuple.ObjectInfo = objectInfo; |
642 |
} |
643 |
else |
644 |
{ |
645 |
var fsInfo = FileInfoExtensions.FromPath(filePath); |
646 |
dct[filePath] = new StateTuple {FileInfo = fsInfo, ObjectInfo = objectInfo}; |
647 |
} |
648 |
} |
649 |
return dct.Values; |
650 |
} |
651 |
|
652 |
/// <summary> |
653 |
/// Returns the latest LastModified date from the list of objects, but only if it is before |
654 |
/// than the threshold value |
655 |
/// </summary> |
656 |
/// <param name="threshold"></param> |
657 |
/// <param name="cloudObjects"></param> |
658 |
/// <returns></returns> |
659 |
private static DateTime? GetLatestDateBefore(DateTime? threshold, IList<ObjectInfo> cloudObjects) |
660 |
{ |
661 |
DateTime? maxDate = null; |
662 |
if (cloudObjects!=null && cloudObjects.Count > 0) |
663 |
maxDate = cloudObjects.Max(obj => obj.Last_Modified); |
664 |
if (maxDate == null || maxDate == DateTime.MinValue) |
665 |
return threshold; |
666 |
if (threshold == null || threshold == DateTime.MinValue || threshold > maxDate) |
667 |
return maxDate; |
668 |
return threshold; |
669 |
} |
670 |
|
671 |
/// <summary> |
672 |
/// Returns the latest LastModified date from the list of objects, but only if it is after |
673 |
/// the threshold value |
674 |
/// </summary> |
675 |
/// <param name="threshold"></param> |
676 |
/// <param name="cloudObjects"></param> |
677 |
/// <returns></returns> |
678 |
private static DateTime? GetLatestDateAfter(DateTime? threshold, IList<ObjectInfo> cloudObjects) |
679 |
{ |
680 |
DateTime? maxDate = null; |
681 |
if (cloudObjects!=null && cloudObjects.Count > 0) |
682 |
maxDate = cloudObjects.Max(obj => obj.Last_Modified); |
683 |
if (maxDate == null || maxDate == DateTime.MinValue) |
684 |
return threshold; |
685 |
if (threshold == null || threshold == DateTime.MinValue || threshold < maxDate) |
686 |
return maxDate; |
687 |
return threshold; |
688 |
} |
689 |
|
690 |
//readonly AccountsDifferencer _differencer = new AccountsDifferencer(); |
691 |
private Dictionary<Uri, List<Uri>> _selectiveUris = new Dictionary<Uri, List<Uri>>(); |
692 |
private bool _pause; |
693 |
|
694 |
/// <summary> |
695 |
/// Deletes local files that are not found in the list of cloud files |
696 |
/// </summary> |
697 |
/// <param name="accountInfo"></param> |
698 |
/// <param name="cloudFiles"></param> |
699 |
private void ProcessDeletedFiles(AccountInfo accountInfo, IEnumerable<ObjectInfo> cloudFiles) |
700 |
{ |
701 |
if (accountInfo == null) |
702 |
throw new ArgumentNullException("accountInfo"); |
703 |
if (String.IsNullOrWhiteSpace(accountInfo.AccountPath)) |
704 |
throw new ArgumentException("The AccountInfo.AccountPath is empty", "accountInfo"); |
705 |
if (cloudFiles == null) |
706 |
throw new ArgumentNullException("cloudFiles"); |
707 |
Contract.EndContractBlock(); |
708 |
|
709 |
var deletedFiles = new List<FileSystemInfo>(); |
710 |
foreach (var objectInfo in cloudFiles) |
711 |
{ |
712 |
if (Log.IsDebugEnabled) |
713 |
Log.DebugFormat("Handle deleted [{0}]", objectInfo.Uri); |
714 |
var relativePath = objectInfo.RelativeUrlToFilePath(accountInfo.UserName); |
715 |
var item = FileAgent.GetFileAgent(accountInfo).GetFileSystemInfo(relativePath); |
716 |
if (Log.IsDebugEnabled) |
717 |
Log.DebugFormat("Will delete [{0}] for [{1}]", item.FullName, objectInfo.Uri); |
718 |
if (item.Exists) |
719 |
{ |
720 |
if ((item.Attributes & FileAttributes.ReadOnly) == FileAttributes.ReadOnly) |
721 |
{ |
722 |
item.Attributes = item.Attributes & ~FileAttributes.ReadOnly; |
723 |
|
724 |
} |
725 |
|
726 |
|
727 |
Log.DebugFormat("Deleting {0}", item.FullName); |
728 |
|
729 |
var directory = item as DirectoryInfo; |
730 |
if (directory != null) |
731 |
directory.Delete(true); |
732 |
else |
733 |
item.Delete(); |
734 |
Log.DebugFormat("Deleted [{0}] for [{1}]", item.FullName, objectInfo.Uri); |
735 |
DateTime lastDate; |
736 |
_lastSeen.TryRemove(item.FullName, out lastDate); |
737 |
deletedFiles.Add(item); |
738 |
} |
739 |
StatusKeeper.SetFileState(item.FullName, FileStatus.Deleted, FileOverlayStatus.Deleted, "File Deleted"); |
740 |
} |
741 |
Log.InfoFormat("[{0}] files were deleted", deletedFiles.Count); |
742 |
StatusNotification.NotifyForFiles(deletedFiles, String.Format("{0} files were deleted", deletedFiles.Count), |
743 |
TraceLevel.Info); |
744 |
|
745 |
} |
746 |
|
747 |
private void MarkSuspectedDeletes(AccountInfo accountInfo, IEnumerable<ObjectInfo> cloudFiles) |
748 |
{ |
749 |
//Only consider files that are not being modified, ie they are in the Unchanged state |
750 |
var deleteCandidates = FileState.Queryable.Where(state => |
751 |
state.FilePath.StartsWith(accountInfo.AccountPath) |
752 |
&& state.FileStatus == FileStatus.Unchanged).ToList(); |
753 |
|
754 |
|
755 |
//TODO: filesToDelete must take into account the Others container |
756 |
var filesToDelete = (from deleteCandidate in deleteCandidates |
757 |
let localFile = FileInfoExtensions.FromPath(deleteCandidate.FilePath) |
758 |
let relativeFilePath = localFile.AsRelativeTo(accountInfo.AccountPath) |
759 |
where |
760 |
!cloudFiles.Any(r => r.RelativeUrlToFilePath(accountInfo.UserName) == relativeFilePath) |
761 |
select localFile).ToList(); |
762 |
|
763 |
|
764 |
//Set the status of missing files to Conflict |
765 |
foreach (var item in filesToDelete) |
766 |
{ |
767 |
//Try to acquire a gate on the file, to take into account files that have been dequeued |
768 |
//and are being processed |
769 |
using (var gate = NetworkGate.Acquire(item.FullName, NetworkOperation.Deleting)) |
770 |
{ |
771 |
if (gate.Failed) |
772 |
continue; |
773 |
StatusKeeper.SetFileState(item.FullName, FileStatus.Conflict, FileOverlayStatus.Deleted, |
774 |
"Local file missing from server"); |
775 |
} |
776 |
} |
777 |
UpdateStatus(PithosStatus.HasConflicts); |
778 |
StatusNotification.NotifyConflicts(filesToDelete, |
779 |
String.Format( |
780 |
"{0} local files are missing from Pithos, possibly because they were deleted", |
781 |
filesToDelete.Count)); |
782 |
StatusNotification.NotifyForFiles(filesToDelete, String.Format("{0} files were deleted", filesToDelete.Count), |
783 |
TraceLevel.Info); |
784 |
} |
785 |
|
786 |
private void ReportConflictForMismatch(string localFilePath) |
787 |
{ |
788 |
if (String.IsNullOrWhiteSpace(localFilePath)) |
789 |
throw new ArgumentNullException("localFilePath"); |
790 |
Contract.EndContractBlock(); |
791 |
|
792 |
StatusKeeper.SetFileState(localFilePath, FileStatus.Conflict, FileOverlayStatus.Conflict, "File changed at the server"); |
793 |
UpdateStatus(PithosStatus.HasConflicts); |
794 |
var message = String.Format("Conflict detected for file {0}", localFilePath); |
795 |
Log.Warn(message); |
796 |
StatusNotification.NotifyChange(message, TraceLevel.Warning); |
797 |
} |
798 |
|
799 |
|
800 |
|
801 |
/// <summary> |
802 |
/// Creates a Sync action for each changed server file |
803 |
/// </summary> |
804 |
/// <param name="accountInfo"></param> |
805 |
/// <param name="changes"></param> |
806 |
/// <returns></returns> |
807 |
private IEnumerable<CloudAction> ChangesToActions(AccountInfo accountInfo, IEnumerable<ObjectInfo> changes) |
808 |
{ |
809 |
if (changes == null) |
810 |
throw new ArgumentNullException(); |
811 |
Contract.EndContractBlock(); |
812 |
var fileAgent = FileAgent.GetFileAgent(accountInfo); |
813 |
|
814 |
//In order to avoid multiple iterations over the files, we iterate only once |
815 |
//over the remote files |
816 |
foreach (var objectInfo in changes) |
817 |
{ |
818 |
var relativePath = objectInfo.RelativeUrlToFilePath(accountInfo.UserName); |
819 |
//If a directory object already exists, we may need to sync it |
820 |
if (fileAgent.Exists(relativePath)) |
821 |
{ |
822 |
var localFile = fileAgent.GetFileSystemInfo(relativePath); |
823 |
//We don't need to sync directories |
824 |
if (objectInfo.IsDirectory && localFile is DirectoryInfo) |
825 |
continue; |
826 |
using (new SessionScope(FlushAction.Never)) |
827 |
{ |
828 |
var state = StatusKeeper.GetStateByFilePath(localFile.FullName); |
829 |
_lastSeen[localFile.FullName] = DateTime.Now; |
830 |
//Common files should be checked on a per-case basis to detect differences, which is newer |
831 |
|
832 |
yield return new CloudAction(accountInfo, CloudActionType.MustSynch, |
833 |
localFile, objectInfo, state, accountInfo.BlockSize, |
834 |
accountInfo.BlockHash,"Poll Changes"); |
835 |
} |
836 |
} |
837 |
else |
838 |
{ |
839 |
//Remote files should be downloaded |
840 |
yield return new CloudDownloadAction(accountInfo, objectInfo,"Poll Changes"); |
841 |
} |
842 |
} |
843 |
} |
844 |
|
845 |
/// <summary> |
846 |
/// Creates a Local Move action for each moved server file |
847 |
/// </summary> |
848 |
/// <param name="accountInfo"></param> |
849 |
/// <param name="moves"></param> |
850 |
/// <returns></returns> |
851 |
private IEnumerable<CloudAction> MovesToActions(AccountInfo accountInfo, IEnumerable<ObjectInfo> moves) |
852 |
{ |
853 |
if (moves == null) |
854 |
throw new ArgumentNullException(); |
855 |
Contract.EndContractBlock(); |
856 |
var fileAgent = FileAgent.GetFileAgent(accountInfo); |
857 |
|
858 |
//In order to avoid multiple iterations over the files, we iterate only once |
859 |
//over the remote files |
860 |
foreach (var objectInfo in moves) |
861 |
{ |
862 |
var previousRelativepath = objectInfo.Previous.RelativeUrlToFilePath(accountInfo.UserName); |
863 |
//If the previous file already exists, we can execute a Move operation |
864 |
if (fileAgent.Exists(previousRelativepath)) |
865 |
{ |
866 |
var previousFile = fileAgent.GetFileSystemInfo(previousRelativepath); |
867 |
using (new SessionScope(FlushAction.Never)) |
868 |
{ |
869 |
var state = StatusKeeper.GetStateByFilePath(previousFile.FullName); |
870 |
_lastSeen[previousFile.FullName] = DateTime.Now; |
871 |
|
872 |
//For each moved object we need to move both the local file and update |
873 |
yield return new CloudAction(accountInfo, CloudActionType.RenameLocal, |
874 |
previousFile, objectInfo, state, accountInfo.BlockSize, |
875 |
accountInfo.BlockHash,"Poll Moves"); |
876 |
//For modified files, we need to download the changes as well |
877 |
if (objectInfo.Hash!=objectInfo.PreviousHash) |
878 |
yield return new CloudDownloadAction(accountInfo,objectInfo, "Poll Moves"); |
879 |
} |
880 |
} |
881 |
//If the previous file does not exist, we need to download it in the new location |
882 |
else |
883 |
{ |
884 |
//Remote files should be downloaded |
885 |
yield return new CloudDownloadAction(accountInfo, objectInfo, "Poll Moves"); |
886 |
} |
887 |
} |
888 |
} |
889 |
|
890 |
|
891 |
/// <summary> |
892 |
/// Creates a download action for each new server file |
893 |
/// </summary> |
894 |
/// <param name="accountInfo"></param> |
895 |
/// <param name="creates"></param> |
896 |
/// <returns></returns> |
897 |
private IEnumerable<CloudAction> CreatesToActions(AccountInfo accountInfo, IEnumerable<ObjectInfo> creates) |
898 |
{ |
899 |
if (creates == null) |
900 |
throw new ArgumentNullException(); |
901 |
Contract.EndContractBlock(); |
902 |
var fileAgent = FileAgent.GetFileAgent(accountInfo); |
903 |
|
904 |
//In order to avoid multiple iterations over the files, we iterate only once |
905 |
//over the remote files |
906 |
foreach (var objectInfo in creates) |
907 |
{ |
908 |
if (Log.IsDebugEnabled) |
909 |
Log.DebugFormat("[NEW INFO] {0}",objectInfo.Uri); |
910 |
|
911 |
var relativePath = objectInfo.RelativeUrlToFilePath(accountInfo.UserName); |
912 |
|
913 |
//If the object already exists, we should check before uploading or downloading |
914 |
if (fileAgent.Exists(relativePath)) |
915 |
{ |
916 |
var localFile= fileAgent.GetFileSystemInfo(relativePath); |
917 |
var state = StatusKeeper.GetStateByFilePath(localFile.WithProperCapitalization().FullName); |
918 |
yield return new CloudAction(accountInfo, CloudActionType.MustSynch, |
919 |
localFile, objectInfo, state, accountInfo.BlockSize, |
920 |
accountInfo.BlockHash,"Poll Creates"); |
921 |
} |
922 |
else |
923 |
{ |
924 |
//Remote files should be downloaded |
925 |
yield return new CloudDownloadAction(accountInfo, objectInfo,"Poll Creates"); |
926 |
} |
927 |
|
928 |
} |
929 |
} |
930 |
|
931 |
/// <summary> |
932 |
/// Notify the UI to update the visual status |
933 |
/// </summary> |
934 |
/// <param name="status"></param> |
935 |
private void UpdateStatus(PithosStatus status) |
936 |
{ |
937 |
try |
938 |
{ |
939 |
StatusNotification.SetPithosStatus(status); |
940 |
//StatusNotification.Notify(new Notification()); |
941 |
} |
942 |
catch (Exception exc) |
943 |
{ |
944 |
//Failure is not critical, just log it |
945 |
Log.Warn("Error while updating status", exc); |
946 |
} |
947 |
} |
948 |
|
949 |
private static void CreateContainerFolders(AccountInfo accountInfo, IEnumerable<ContainerInfo> containers) |
950 |
{ |
951 |
var containerPaths = from container in containers |
952 |
let containerPath = Path.Combine(accountInfo.AccountPath, container.Name) |
953 |
where container.Name != FolderConstants.TrashContainer && !Directory.Exists(containerPath) |
954 |
select containerPath; |
955 |
|
956 |
foreach (var path in containerPaths) |
957 |
{ |
958 |
Directory.CreateDirectory(path); |
959 |
} |
960 |
} |
961 |
|
962 |
public void AddAccount(AccountInfo accountInfo) |
963 |
{ |
964 |
//Avoid adding a duplicate accountInfo |
965 |
_accounts.TryAdd(accountInfo.AccountKey, accountInfo); |
966 |
} |
967 |
|
968 |
public void RemoveAccount(AccountInfo accountInfo) |
969 |
{ |
970 |
AccountInfo account; |
971 |
_accounts.TryRemove(accountInfo.AccountKey, out account); |
972 |
/* |
973 |
SnapshotDifferencer differencer; |
974 |
_differencer.Differencers.TryRemove(accountInfo.AccountKey, out differencer); |
975 |
*/ |
976 |
} |
977 |
|
978 |
public void SetSelectivePaths(AccountInfo accountInfo,Uri[] added, Uri[] removed) |
979 |
{ |
980 |
AbortRemovedPaths(accountInfo,removed); |
981 |
DownloadNewPaths(accountInfo,added); |
982 |
} |
983 |
|
984 |
private void DownloadNewPaths(AccountInfo accountInfo, Uri[] added) |
985 |
{ |
986 |
var client = new CloudFilesClient(accountInfo); |
987 |
foreach (var folderUri in added) |
988 |
{ |
989 |
try |
990 |
{ |
991 |
|
992 |
string account; |
993 |
string container; |
994 |
var segmentsCount = folderUri.Segments.Length; |
995 |
//Is this an account URL? |
996 |
if (segmentsCount < 3) |
997 |
continue; |
998 |
//Is this a container or folder URL? |
999 |
if (segmentsCount == 3) |
1000 |
{ |
1001 |
account = folderUri.Segments[1].TrimEnd('/'); |
1002 |
container = folderUri.Segments[2].TrimEnd('/'); |
1003 |
} |
1004 |
else |
1005 |
{ |
1006 |
account = folderUri.Segments[2].TrimEnd('/'); |
1007 |
container = folderUri.Segments[3].TrimEnd('/'); |
1008 |
} |
1009 |
IList<ObjectInfo> items; |
1010 |
if (segmentsCount > 3) |
1011 |
{ |
1012 |
//List folder |
1013 |
var folder = String.Join("", folderUri.Segments.Splice(4)); |
1014 |
items = client.ListObjects(account, container, folder); |
1015 |
} |
1016 |
else |
1017 |
{ |
1018 |
//List container |
1019 |
items = client.ListObjects(account, container); |
1020 |
} |
1021 |
var actions = CreatesToActions(accountInfo, items); |
1022 |
foreach (var action in actions) |
1023 |
{ |
1024 |
NetworkAgent.Post(action); |
1025 |
} |
1026 |
} |
1027 |
catch (Exception exc) |
1028 |
{ |
1029 |
Log.WarnFormat("Listing of new selective path [{0}] failed with \r\n{1}", folderUri, exc); |
1030 |
} |
1031 |
} |
1032 |
|
1033 |
//Need to get a listing of each of the URLs, then post them to the NetworkAgent |
1034 |
//CreatesToActions(accountInfo,) |
1035 |
|
1036 |
/* NetworkAgent.Post();*/ |
1037 |
} |
1038 |
|
1039 |
private void AbortRemovedPaths(AccountInfo accountInfo, Uri[] removed) |
1040 |
{ |
1041 |
/*this.NetworkAgent.*/ |
1042 |
} |
1043 |
} |
1044 |
} |