root / trunk / Pithos.Core / Agents / FileAgent.cs @ e0f69809
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#region |
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/* ----------------------------------------------------------------------- |
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* <copyright file="FileAgent.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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using System; |
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using System.Collections.Generic; |
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using System.Diagnostics.Contracts; |
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using System.IO; |
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using System.Linq; |
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using System.Reflection; |
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using System.Threading.Tasks; |
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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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// [Export] |
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public class FileAgent |
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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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Agent<WorkflowState> _agent; |
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private FileSystemWatcher _watcher; |
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private FileSystemWatcherAdapter _adapter; |
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|
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//[Import] |
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public IStatusKeeper StatusKeeper { get; set; } |
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|
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public IStatusNotification StatusNotification { get; set; } |
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//[Import] |
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public IPithosWorkflow Workflow { get; set; } |
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//[Import] |
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public WorkflowAgent WorkflowAgent { get; set; } |
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|
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private AccountInfo AccountInfo { get; set; } |
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|
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internal string RootPath { get; set; } |
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|
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private FileEventIdleBatch _eventIdleBatch; |
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|
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public TimeSpan IdleTimeout { get; set; } |
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|
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|
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private void ProcessBatchedEvents(Dictionary<string, FileSystemEventArgs[]> fileEvents) |
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{ |
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StatusNotification.SetPithosStatus(PithosStatus.LocalSyncing,String.Format("Uploading {0} files",fileEvents.Count)); |
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foreach (var fileEvent in fileEvents) |
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{ |
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var filePath = fileEvent.Key; |
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var changes = fileEvent.Value; |
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|
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if (Ignore(filePath)) continue; |
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|
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foreach (var change in changes) |
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{ |
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if (change.ChangeType == WatcherChangeTypes.Renamed) |
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{ |
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var rename = (MovedEventArgs) change; |
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_agent.Post(new WorkflowState(change) |
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{ |
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AccountInfo = AccountInfo, |
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OldPath = rename.OldFullPath, |
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OldFileName = Path.GetFileName(rename.OldName), |
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Path = rename.FullPath, |
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FileName = Path.GetFileName(rename.Name), |
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TriggeringChange = rename.ChangeType |
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}); |
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} |
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else |
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_agent.Post(new WorkflowState(change) |
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{ |
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AccountInfo = AccountInfo, |
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Path = change.FullPath, |
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FileName = Path.GetFileName(change.Name), |
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TriggeringChange = change.ChangeType |
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}); |
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} |
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} |
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StatusNotification.SetPithosStatus(PithosStatus.LocalComplete); |
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} |
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|
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public void Start(AccountInfo accountInfo,string rootPath) |
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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(rootPath)) |
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throw new ArgumentNullException("rootPath"); |
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if (!Path.IsPathRooted(rootPath)) |
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throw new ArgumentException("rootPath must be an absolute path","rootPath"); |
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if (IdleTimeout == null) |
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throw new InvalidOperationException("IdleTimeout must have a valid value"); |
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Contract.EndContractBlock(); |
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|
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AccountInfo = accountInfo; |
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RootPath = rootPath; |
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|
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_eventIdleBatch = new FileEventIdleBatch((int)IdleTimeout.TotalMilliseconds, ProcessBatchedEvents); |
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|
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_watcher = new FileSystemWatcher(rootPath) {IncludeSubdirectories = true,InternalBufferSize=8*4096}; |
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_adapter = new FileSystemWatcherAdapter(_watcher); |
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|
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_adapter.Changed += OnFileEvent; |
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_adapter.Created += OnFileEvent; |
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_adapter.Deleted += OnFileEvent; |
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//_adapter.Renamed += OnRenameEvent; |
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_adapter.Moved += OnMoveEvent; |
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_watcher.EnableRaisingEvents = true; |
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|
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|
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_agent = Agent<WorkflowState>.Start(inbox => |
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{ |
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Action loop = null; |
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loop = () => |
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{ |
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var message = inbox.Receive(); |
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var process=message.Then(Process,inbox.CancellationToken); |
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inbox.LoopAsync(process,loop,ex=> |
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Log.ErrorFormat("[ERROR] File Event Processing:\r{0}", ex)); |
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}; |
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loop(); |
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}); |
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} |
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|
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private Task<object> Process(WorkflowState state) |
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{ |
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if (state==null) |
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throw new ArgumentNullException("state"); |
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Contract.EndContractBlock(); |
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|
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if (Ignore(state.Path)) |
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return CompletedTask<object>.Default; |
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|
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var networkState = NetworkGate.GetNetworkState(state.Path); |
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//Skip if the file is already being downloaded or uploaded and |
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//the change is create or modify |
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if (networkState != NetworkOperation.None && |
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( |
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state.TriggeringChange == WatcherChangeTypes.Created || |
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state.TriggeringChange == WatcherChangeTypes.Changed |
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)) |
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return CompletedTask<object>.Default; |
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|
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try |
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{ |
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//StatusKeeper.EnsureFileState(state.Path); |
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|
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UpdateFileStatus(state); |
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UpdateOverlayStatus(state); |
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UpdateFileChecksum(state); |
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WorkflowAgent.Post(state); |
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} |
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catch (IOException exc) |
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{ |
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if (File.Exists(state.Path)) |
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{ |
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Log.WarnFormat("File access error occured, retrying {0}\n{1}", state.Path, exc); |
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_agent.Post(state); |
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} |
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else |
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{ |
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Log.WarnFormat("File {0} does not exist. Will be ignored\n{1}", state.Path, exc); |
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} |
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} |
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catch (Exception exc) |
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{ |
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Log.WarnFormat("Error occured while indexing{0}. The file will be skipped\n{1}", |
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state.Path, exc); |
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} |
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return CompletedTask<object>.Default; |
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} |
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|
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public bool Pause |
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{ |
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get { return _watcher == null || !_watcher.EnableRaisingEvents; } |
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set |
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{ |
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if (_watcher != null) |
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_watcher.EnableRaisingEvents = !value; |
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} |
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} |
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|
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public string CachePath { get; set; } |
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|
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/*private List<string> _selectivePaths = new List<string>(); |
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public List<string> SelectivePaths |
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{ |
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get { return _selectivePaths; } |
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set { _selectivePaths = value; } |
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} |
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*/ |
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public Selectives Selectives { get; set; } |
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|
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|
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public void Post(WorkflowState workflowState) |
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{ |
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if (workflowState == null) |
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throw new ArgumentNullException("workflowState"); |
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Contract.EndContractBlock(); |
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|
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_agent.Post(workflowState); |
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} |
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|
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public void Stop() |
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{ |
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if (_watcher != null) |
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{ |
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_watcher.Dispose(); |
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} |
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_watcher = null; |
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|
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if (_agent!=null) |
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_agent.Stop(); |
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} |
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|
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// Enumerate all files in the Pithos directory except those in the Fragment folder |
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// and files with a .ignore extension |
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public IEnumerable<string> EnumerateFiles(string searchPattern="*") |
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{ |
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var monitoredFiles = from filePath in Directory.EnumerateFileSystemEntries(RootPath, searchPattern, SearchOption.AllDirectories) |
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where !Ignore(filePath) |
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select filePath; |
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return monitoredFiles; |
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} |
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|
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public IEnumerable<FileInfo> EnumerateFileInfos(string searchPattern="*") |
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{ |
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var rootDir = new DirectoryInfo(RootPath); |
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var monitoredFiles = from file in rootDir.EnumerateFiles(searchPattern, SearchOption.AllDirectories) |
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where !Ignore(file.FullName) |
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select file; |
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return monitoredFiles; |
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} |
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|
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public IEnumerable<string> EnumerateFilesAsRelativeUrls(string searchPattern="*") |
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{ |
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var rootDir = new DirectoryInfo(RootPath); |
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var monitoredFiles = from file in rootDir.EnumerateFiles(searchPattern, SearchOption.AllDirectories) |
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where !Ignore(file.FullName) |
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select file.AsRelativeUrlTo(RootPath); |
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return monitoredFiles; |
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} |
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|
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public IEnumerable<string> EnumerateFilesSystemInfosAsRelativeUrls(string searchPattern="*") |
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{ |
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var rootDir = new DirectoryInfo(RootPath); |
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var monitoredFiles = from file in rootDir.EnumerateFileSystemInfos(searchPattern, SearchOption.AllDirectories) |
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where !Ignore(file.FullName) |
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select file.AsRelativeUrlTo(RootPath); |
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return monitoredFiles; |
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} |
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|
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|
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|
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|
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private bool Ignore(string filePath) |
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{ |
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if (IgnorePaths(filePath)) return true; |
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|
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|
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//If selective sync is enabled, propagate folder events |
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if (Selectives.IsSelectiveEnabled(AccountInfo.AccountKey) && Directory.Exists(filePath)) |
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return false; |
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//Ignore if selective synchronization is defined, |
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//And the target file is not below any of the selective paths |
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return !Selectives.IsSelected(AccountInfo, filePath); |
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} |
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|
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private bool IgnorePaths(string filePath) |
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{ |
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//Ignore all first-level directories and files (ie at the container folders level) |
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if (FoundBelowRoot(filePath, RootPath, 1)) |
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return true; |
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|
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//Ignore first-level items under the "others" folder (ie at the accounts folders level). |
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var othersPath = Path.Combine(RootPath, FolderConstants.OthersFolder); |
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if (FoundBelowRoot(filePath, othersPath, 1)) |
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return true; |
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|
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//Ignore second-level (container) folders under the "others" folder (ie at the container folders level). |
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if (FoundBelowRoot(filePath, othersPath, 2)) |
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return true; |
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|
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|
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//Ignore anything happening in the cache path |
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if (filePath.StartsWith(CachePath)) |
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return true; |
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if (_ignoreFiles.ContainsKey(filePath.ToLower())) |
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return true; |
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return false; |
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} |
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|
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/* private static bool FoundInRoot(string filePath, string rootPath) |
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{ |
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//var rootDirectory = new DirectoryInfo(rootPath); |
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|
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//If the paths are equal, return true |
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if (filePath.Equals(rootPath, StringComparison.InvariantCultureIgnoreCase)) |
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return true; |
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|
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//If the filepath is below the root path |
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if (filePath.StartsWith(rootPath,StringComparison.InvariantCulture)) |
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{ |
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//Get the relative path |
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var relativePath = filePath.Substring(rootPath.Length + 1); |
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//If the relativePath does NOT contains a path separator, we found a match |
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return (!relativePath.Contains(@"\")); |
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} |
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|
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//If the filepath is not under the root path, return false |
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return false; |
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}*/ |
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|
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|
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private static bool FoundBelowRoot(string filePath, string rootPath,int level) |
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{ |
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//var rootDirectory = new DirectoryInfo(rootPath); |
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|
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//If the paths are equal, return true |
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if (filePath.Equals(rootPath, StringComparison.InvariantCultureIgnoreCase)) |
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return true; |
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|
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//If the filepath is below the root path |
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if (filePath.StartsWith(rootPath,StringComparison.InvariantCulture)) |
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{ |
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//Get the relative path |
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var relativePath = filePath.Substring(rootPath.Length + 1); |
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//If the relativePath does NOT contains a path separator, we found a match |
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var levels=relativePath.ToCharArray().Count(c=>c=='\\')+1; |
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return levels==level; |
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} |
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|
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//If the filepath is not under the root path, return false |
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return false; |
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} |
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|
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//Post a Change message for all events except rename |
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void OnFileEvent(object sender, FileSystemEventArgs e) |
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{ |
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//Ignore events that affect the cache folder |
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var filePath = e.FullPath; |
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if (Ignore(filePath)) |
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return; |
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_eventIdleBatch.Post(e); |
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} |
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|
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|
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/* |
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//Post a Change message for renames containing the old and new names |
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void OnRenameEvent(object sender, RenamedEventArgs e) |
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{ |
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var oldFullPath = e.OldFullPath; |
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var fullPath = e.FullPath; |
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if (Ignore(oldFullPath) || Ignore(fullPath)) |
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return; |
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|
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_agent.Post(new WorkflowState |
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{ |
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AccountInfo=AccountInfo, |
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OldPath = oldFullPath, |
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OldFileName = e.OldName, |
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Path = fullPath, |
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FileName = e.Name, |
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TriggeringChange = e.ChangeType |
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}); |
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} |
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*/ |
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|
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//Post a Change message for moves containing the old and new names |
407 |
void OnMoveEvent(object sender, MovedEventArgs e) |
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{ |
409 |
var oldFullPath = e.OldFullPath; |
410 |
var fullPath = e.FullPath; |
411 |
|
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//If the source path is one of the ignored folders, ignore |
413 |
if (IgnorePaths(oldFullPath)) |
414 |
return; |
415 |
|
416 |
//Ignore takes into account Selective Sync |
417 |
if (Ignore(fullPath)) |
418 |
return; |
419 |
|
420 |
_eventIdleBatch.Post(e); |
421 |
} |
422 |
|
423 |
|
424 |
|
425 |
private Dictionary<WatcherChangeTypes, FileStatus> _statusDict = new Dictionary<WatcherChangeTypes, FileStatus> |
426 |
{ |
427 |
{WatcherChangeTypes.Created,FileStatus.Created}, |
428 |
{WatcherChangeTypes.Changed,FileStatus.Modified}, |
429 |
{WatcherChangeTypes.Deleted,FileStatus.Deleted}, |
430 |
{WatcherChangeTypes.Renamed,FileStatus.Renamed} |
431 |
}; |
432 |
|
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private Dictionary<string, string> _ignoreFiles=new Dictionary<string, string>(); |
434 |
|
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private WorkflowState UpdateFileStatus(WorkflowState state) |
436 |
{ |
437 |
if (state==null) |
438 |
throw new ArgumentNullException("state"); |
439 |
if (String.IsNullOrWhiteSpace(state.Path)) |
440 |
throw new ArgumentException("The state's Path can't be empty","state"); |
441 |
Contract.EndContractBlock(); |
442 |
|
443 |
var path = state.Path; |
444 |
var status = _statusDict[state.TriggeringChange]; |
445 |
var oldStatus = Workflow.StatusKeeper.GetFileStatus(path); |
446 |
if (status == oldStatus) |
447 |
{ |
448 |
state.Status = status; |
449 |
state.Skip = true; |
450 |
return state; |
451 |
} |
452 |
if (state.Status == FileStatus.Renamed) |
453 |
Workflow.ClearFileStatus(path); |
454 |
|
455 |
state.Status = Workflow.SetFileStatus(path, status); |
456 |
return state; |
457 |
} |
458 |
|
459 |
private WorkflowState UpdateOverlayStatus(WorkflowState state) |
460 |
{ |
461 |
if (state==null) |
462 |
throw new ArgumentNullException("state"); |
463 |
Contract.EndContractBlock(); |
464 |
|
465 |
if (state.Skip) |
466 |
return state; |
467 |
|
468 |
switch (state.Status) |
469 |
{ |
470 |
case FileStatus.Created: |
471 |
this.StatusKeeper.SetFileOverlayStatus(state.Path, FileOverlayStatus.Modified,state.ShortHash); |
472 |
break; |
473 |
case FileStatus.Modified: |
474 |
this.StatusKeeper.SetFileOverlayStatus(state.Path, FileOverlayStatus.Modified,state.ShortHash); |
475 |
break; |
476 |
case FileStatus.Deleted: |
477 |
//this.StatusAgent.RemoveFileOverlayStatus(state.Path); |
478 |
break; |
479 |
case FileStatus.Renamed: |
480 |
this.StatusKeeper.ClearFileStatus(state.OldPath); |
481 |
this.StatusKeeper.SetFileOverlayStatus(state.Path, FileOverlayStatus.Modified,state.ShortHash); |
482 |
break; |
483 |
case FileStatus.Unchanged: |
484 |
this.StatusKeeper.SetFileOverlayStatus(state.Path, FileOverlayStatus.Normal,state.ShortHash); |
485 |
break; |
486 |
} |
487 |
|
488 |
if (state.Status == FileStatus.Deleted) |
489 |
NativeMethods.RaiseChangeNotification(Path.GetDirectoryName(state.Path)); |
490 |
else |
491 |
NativeMethods.RaiseChangeNotification(state.Path); |
492 |
return state; |
493 |
} |
494 |
|
495 |
|
496 |
private WorkflowState UpdateFileChecksum(WorkflowState state) |
497 |
{ |
498 |
if (state.Skip) |
499 |
return state; |
500 |
|
501 |
if (state.Status == FileStatus.Deleted) |
502 |
return state; |
503 |
|
504 |
var path = state.Path; |
505 |
//Skip calculation for folders |
506 |
if (Directory.Exists(path)) |
507 |
return state; |
508 |
|
509 |
var info = new FileInfo(path); |
510 |
|
511 |
using (StatusNotification.GetNotifier("Hashing {0}", "Finished Hashing {0}", info.Name)) |
512 |
{ |
513 |
|
514 |
var shortHash = info.ComputeShortHash(); |
515 |
|
516 |
string merkleHash = info.CalculateHash(StatusKeeper.BlockSize, StatusKeeper.BlockHash); |
517 |
StatusKeeper.UpdateFileChecksum(path, shortHash, merkleHash); |
518 |
|
519 |
state.Hash = merkleHash; |
520 |
return state; |
521 |
} |
522 |
} |
523 |
|
524 |
//Does the file exist in the container's local folder? |
525 |
public bool Exists(string relativePath) |
526 |
{ |
527 |
if (String.IsNullOrWhiteSpace(relativePath)) |
528 |
throw new ArgumentNullException("relativePath"); |
529 |
//A RootPath must be set before calling this method |
530 |
if (String.IsNullOrWhiteSpace(RootPath)) |
531 |
throw new InvalidOperationException("RootPath was not set"); |
532 |
Contract.EndContractBlock(); |
533 |
//Create the absolute path by combining the RootPath with the relativePath |
534 |
var absolutePath=Path.Combine(RootPath, relativePath); |
535 |
//Is this a valid file? |
536 |
if (File.Exists(absolutePath)) |
537 |
return true; |
538 |
//Or a directory? |
539 |
if (Directory.Exists(absolutePath)) |
540 |
return true; |
541 |
//Fail if it is neither |
542 |
return false; |
543 |
} |
544 |
|
545 |
public static FileAgent GetFileAgent(AccountInfo accountInfo) |
546 |
{ |
547 |
return GetFileAgent(accountInfo.AccountPath); |
548 |
} |
549 |
|
550 |
public static FileAgent GetFileAgent(string rootPath) |
551 |
{ |
552 |
return AgentLocator<FileAgent>.Get(rootPath.ToLower()); |
553 |
} |
554 |
|
555 |
|
556 |
public FileSystemInfo GetFileSystemInfo(string relativePath) |
557 |
{ |
558 |
if (String.IsNullOrWhiteSpace(relativePath)) |
559 |
throw new ArgumentNullException("relativePath"); |
560 |
//A RootPath must be set before calling this method |
561 |
if (String.IsNullOrWhiteSpace(RootPath)) |
562 |
throw new InvalidOperationException("RootPath was not set"); |
563 |
Contract.EndContractBlock(); |
564 |
|
565 |
var absolutePath = Path.Combine(RootPath, relativePath); |
566 |
|
567 |
if (Directory.Exists(absolutePath)) |
568 |
return new DirectoryInfo(absolutePath).WithProperCapitalization(); |
569 |
else |
570 |
return new FileInfo(absolutePath).WithProperCapitalization(); |
571 |
|
572 |
} |
573 |
|
574 |
public void Delete(string relativePath) |
575 |
{ |
576 |
var absolutePath = Path.Combine(RootPath, relativePath).ToLower(); |
577 |
if (Log.IsDebugEnabled) |
578 |
Log.DebugFormat("Deleting {0}", absolutePath); |
579 |
if (File.Exists(absolutePath)) |
580 |
{ |
581 |
try |
582 |
{ |
583 |
File.Delete(absolutePath); |
584 |
} |
585 |
//The file may have been deleted by another thread. Just ignore the relevant exception |
586 |
catch (FileNotFoundException) { } |
587 |
} |
588 |
else if (Directory.Exists(absolutePath)) |
589 |
{ |
590 |
try |
591 |
{ |
592 |
Directory.Delete(absolutePath, true); |
593 |
} |
594 |
//The directory may have been deleted by another thread. Just ignore the relevant exception |
595 |
catch (DirectoryNotFoundException){} |
596 |
} |
597 |
|
598 |
//_ignoreFiles[absolutePath] = absolutePath; |
599 |
StatusKeeper.ClearFileStatus(absolutePath); |
600 |
} |
601 |
} |
602 |
} |