root / trunk / Pithos.Core / Agents / NetworkAgent.cs @ 6f03d6e1
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#region |
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/* ----------------------------------------------------------------------- |
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* <copyright file="NetworkAgent.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; |
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using System.Collections.Generic; |
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using System.ComponentModel.Composition; |
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using System.Diagnostics; |
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using System.Diagnostics.Contracts; |
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using System.IO; |
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using System.Net; |
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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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[Export] |
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public class NetworkAgent |
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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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private Agent<CloudAction> _agent; |
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|
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[System.ComponentModel.Composition.Import] |
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private DeleteAgent _deleteAgent=new DeleteAgent(); |
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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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public IStatusNotification StatusNotification { get; set; } |
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|
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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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//The Proceed signals the poll agent that it can proceed with polling. |
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//Essentially it stops the poll agent to give priority to the network agent |
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//Initially the event is signalled because we don't need to pause |
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private readonly AsyncManualResetEvent _proceedEvent = new AsyncManualResetEvent(true); |
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|
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public AsyncManualResetEvent ProceedEvent |
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{ |
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get { return _proceedEvent; } |
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} |
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|
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|
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public void Start() |
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{ |
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if (_agent != null) |
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return; |
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|
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if (Log.IsDebugEnabled) |
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Log.Debug("Starting Network Agent"); |
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|
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_agent = Agent<CloudAction>.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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_deleteAgent.ProceedEvent.Wait(); |
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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); |
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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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|
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private async Task Process(CloudAction action) |
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{ |
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if (action == null) |
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throw new ArgumentNullException("action"); |
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if (action.AccountInfo==null) |
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throw new ArgumentException("The action.AccountInfo is empty","action"); |
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Contract.EndContractBlock(); |
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|
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|
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|
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|
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using (log4net.ThreadContext.Stacks["Operation"].Push(action.ToString())) |
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{ |
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|
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var cloudFile = action.CloudFile; |
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var downloadPath = action.GetDownloadPath(); |
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|
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try |
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{ |
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StatusNotification.SetPithosStatus(PithosStatus.LocalSyncing,"Processing"); |
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_proceedEvent.Reset(); |
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//UpdateStatus(PithosStatus.Syncing); |
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var accountInfo = action.AccountInfo; |
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|
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if (action.Action == CloudActionType.DeleteCloud) |
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{ |
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//Redirect deletes to the delete agent |
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_deleteAgent.Post((CloudDeleteAction)action); |
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} |
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if (_deleteAgent.IsDeletedFile(action)) |
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{ |
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//Clear the status of already deleted files to avoid reprocessing |
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if (action.LocalFile != null) |
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StatusKeeper.ClearFileStatus(action.LocalFile.FullName); |
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} |
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else |
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{ |
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switch (action.Action) |
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{ |
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case CloudActionType.UploadUnconditional: |
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//Abort if the file was deleted before we reached this point |
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await UploadCloudFile(action); |
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break; |
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case CloudActionType.DownloadUnconditional: |
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await DownloadCloudFile(accountInfo, cloudFile, downloadPath); |
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break; |
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case CloudActionType.RenameCloud: |
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var moveAction = (CloudMoveAction)action; |
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RenameCloudFile(accountInfo, moveAction); |
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break; |
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case CloudActionType.RenameLocal: |
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RenameLocalFile(accountInfo, action); |
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break; |
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case CloudActionType.MustSynch: |
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if (!File.Exists(downloadPath) && !Directory.Exists(downloadPath)) |
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{ |
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await DownloadCloudFile(accountInfo, cloudFile, downloadPath); |
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} |
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else |
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{ |
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await SyncFiles(accountInfo, action); |
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} |
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break; |
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} |
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} |
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Log.InfoFormat("End Processing {0}:{1}->{2}", action.Action, action.LocalFile, |
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action.CloudFile.Name); |
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} |
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catch (WebException exc) |
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{ |
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Log.ErrorFormat("[WEB ERROR] {0} : {1} -> {2} due to exception\r\n{3}", action.Action, action.LocalFile, action.CloudFile, exc); |
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} |
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catch (OperationCanceledException) |
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{ |
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throw; |
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} |
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catch (DirectoryNotFoundException) |
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{ |
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Log.ErrorFormat("{0} : {1} -> {2} failed because the directory was not found.\n Rescheduling a delete", |
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action.Action, action.LocalFile, action.CloudFile); |
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//Post a delete action for the missing file |
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Post(new CloudDeleteAction(action)); |
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} |
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catch (FileNotFoundException) |
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{ |
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Log.ErrorFormat("{0} : {1} -> {2} failed because the file was not found.\n Rescheduling a delete", |
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action.Action, action.LocalFile, action.CloudFile); |
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//Post a delete action for the missing file |
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Post(new CloudDeleteAction(action)); |
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} |
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catch (Exception exc) |
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{ |
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Log.ErrorFormat("[REQUEUE] {0} : {1} -> {2} due to exception\r\n{3}", |
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action.Action, action.LocalFile, action.CloudFile, exc); |
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|
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_agent.Post(action); |
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} |
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finally |
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{ |
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if (_agent.IsEmpty) |
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_proceedEvent.Set(); |
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UpdateStatus(PithosStatus.LocalComplete); |
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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 void UpdateStatus(PithosStatus status) |
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{ |
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StatusNotification.SetPithosStatus(status); |
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//StatusNotification.Notify(new Notification()); |
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} |
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|
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private void RenameLocalFile(AccountInfo accountInfo, CloudAction action) |
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{ |
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if (accountInfo == null) |
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throw new ArgumentNullException("accountInfo"); |
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if (action == null) |
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throw new ArgumentNullException("action"); |
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if (action.LocalFile == null) |
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throw new ArgumentException("The action's local file is not specified", "action"); |
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if (!Path.IsPathRooted(action.LocalFile.FullName)) |
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throw new ArgumentException("The action's local file path must be absolute", "action"); |
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if (action.CloudFile == null) |
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throw new ArgumentException("The action's cloud file is not specified", "action"); |
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Contract.EndContractBlock(); |
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using (ThreadContext.Stacks["Operation"].Push("RenameLocalFile")) |
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{ |
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|
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//We assume that the local file already exists, otherwise the poll agent |
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//would have issued a download request |
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|
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var currentInfo = action.CloudFile; |
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var previousInfo = action.CloudFile.Previous; |
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var fileAgent = FileAgent.GetFileAgent(accountInfo); |
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|
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var previousRelativepath = previousInfo.RelativeUrlToFilePath(accountInfo.UserName); |
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var previousFile = fileAgent.GetFileSystemInfo(previousRelativepath); |
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|
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//In every case we need to move the local file first |
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MoveLocalFile(accountInfo, previousFile, fileAgent, currentInfo); |
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} |
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} |
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|
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private void MoveLocalFile(AccountInfo accountInfo, FileSystemInfo previousFile, FileAgent fileAgent, |
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ObjectInfo currentInfo) |
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{ |
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var currentRelativepath = currentInfo.RelativeUrlToFilePath(accountInfo.UserName); |
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var newPath = Path.Combine(fileAgent.RootPath, currentRelativepath); |
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|
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var isFile= (previousFile is FileInfo); |
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var previousFullPath = isFile? |
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FileInfoExtensions.GetProperFilePathCapitalization(previousFile.FullName): |
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FileInfoExtensions.GetProperDirectoryCapitalization(previousFile.FullName); |
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|
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using (var gateOld = NetworkGate.Acquire(previousFullPath, NetworkOperation.Renaming)) |
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using (var gateNew = NetworkGate.Acquire(newPath,NetworkOperation.Renaming)) |
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using (new SessionScope(FlushAction.Auto)) |
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{ |
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if (isFile) |
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(previousFile as FileInfo).MoveTo(newPath); |
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else |
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{ |
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(previousFile as DirectoryInfo).MoveTo(newPath); |
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} |
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var state = StatusKeeper.GetStateByFilePath(previousFullPath); |
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state.FilePath = newPath; |
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state.SaveCopy(); |
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StatusKeeper.SetFileState(previousFullPath,FileStatus.Deleted,FileOverlayStatus.Deleted); |
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} |
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} |
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|
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private async Task SyncFiles(AccountInfo accountInfo,CloudAction action) |
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{ |
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if (accountInfo == null) |
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throw new ArgumentNullException("accountInfo"); |
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if (action==null) |
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throw new ArgumentNullException("action"); |
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if (action.LocalFile==null) |
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throw new ArgumentException("The action's local file is not specified","action"); |
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if (!Path.IsPathRooted(action.LocalFile.FullName)) |
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throw new ArgumentException("The action's local file path must be absolute","action"); |
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if (action.CloudFile== null) |
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throw new ArgumentException("The action's cloud file is not specified", "action"); |
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Contract.EndContractBlock(); |
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using (ThreadContext.Stacks["Operation"].Push("SyncFiles")) |
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{ |
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|
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var localFile = action.LocalFile; |
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var cloudFile = action.CloudFile; |
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var downloadPath = action.LocalFile.GetProperCapitalization(); |
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|
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var cloudHash = cloudFile.Hash.ToLower(); |
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var previousCloudHash = cloudFile.PreviousHash.ToLower(); |
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var localHash = action.TreeHash.Value.TopHash.ToHashString();// LocalHash.Value.ToLower(); |
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//var topHash = action.TopHash.Value.ToLower(); |
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|
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//At this point we know that an object has changed on the server and that a local |
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//file already exists. We need to decide whether the file has only changed on |
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//the server or there is a conflicting change on the client. |
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// |
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|
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//If the hashes match, we are done |
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if (cloudHash == localHash) |
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{ |
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Log.InfoFormat("Skipping {0}, hashes match", downloadPath); |
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return; |
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} |
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|
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//The hashes DON'T match. We need to sync |
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|
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// If the previous tophash matches the local tophash, the file was only changed on the server. |
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if (localHash == previousCloudHash) |
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{ |
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await DownloadCloudFile(accountInfo, cloudFile, downloadPath); |
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} |
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else |
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{ |
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//If the previous and local hash don't match, there was a local conflict |
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//that was not uploaded to the server. We have a conflict |
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ReportConflict(downloadPath); |
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} |
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} |
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} |
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|
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private void ReportConflict(string downloadPath) |
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{ |
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if (String.IsNullOrWhiteSpace(downloadPath)) |
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throw new ArgumentNullException("downloadPath"); |
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Contract.EndContractBlock(); |
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|
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StatusKeeper.SetFileOverlayStatus(downloadPath, FileOverlayStatus.Conflict); |
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UpdateStatus(PithosStatus.HasConflicts); |
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var message = String.Format("Conflict detected for file {0}", downloadPath); |
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Log.Warn(message); |
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StatusNotification.NotifyChange(message, TraceLevel.Warning); |
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} |
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|
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public void Post(CloudAction cloudAction) |
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{ |
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if (cloudAction == null) |
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throw new ArgumentNullException("cloudAction"); |
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if (cloudAction.AccountInfo==null) |
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throw new ArgumentException("The CloudAction.AccountInfo is empty","cloudAction"); |
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Contract.EndContractBlock(); |
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|
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_deleteAgent.ProceedEvent.Wait(); |
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/* |
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|
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//If the action targets a local file, add a treehash calculation |
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if (!(cloudAction is CloudDeleteAction) && cloudAction.LocalFile as FileInfo != null) |
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{ |
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var accountInfo = cloudAction.AccountInfo; |
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var localFile = (FileInfo) cloudAction.LocalFile; |
367 |
|
368 |
if (localFile.Length > accountInfo.BlockSize) |
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cloudAction.TopHash = |
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new Lazy<string>(() => Signature.CalculateTreeHashAsync(localFile, |
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accountInfo.BlockSize, |
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accountInfo.BlockHash, Settings.HashingParallelism).Result |
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.TopHash.ToHashString()); |
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else |
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{ |
376 |
cloudAction.TopHash = new Lazy<string>(() => cloudAction.LocalHash.Value); |
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} |
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|
379 |
} |
380 |
else |
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{ |
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//The hash for a directory is the empty string |
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cloudAction.TopHash = new Lazy<string>(() => String.Empty); |
384 |
} |
385 |
*/ |
386 |
|
387 |
if (cloudAction is CloudDeleteAction) |
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_deleteAgent.Post((CloudDeleteAction)cloudAction); |
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else |
390 |
_agent.Post(cloudAction); |
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} |
392 |
|
393 |
|
394 |
public IEnumerable<CloudAction> GetEnumerable() |
395 |
{ |
396 |
return _agent.GetEnumerable(); |
397 |
} |
398 |
|
399 |
public Task GetDeleteAwaiter() |
400 |
{ |
401 |
return _deleteAgent.ProceedEvent.WaitAsync(); |
402 |
} |
403 |
public CancellationToken CancellationToken |
404 |
{ |
405 |
get { return _agent.CancellationToken; } |
406 |
} |
407 |
|
408 |
private static FileAgent GetFileAgent(AccountInfo accountInfo) |
409 |
{ |
410 |
return AgentLocator<FileAgent>.Get(accountInfo.AccountPath); |
411 |
} |
412 |
|
413 |
|
414 |
|
415 |
private void RenameCloudFile(AccountInfo accountInfo,CloudMoveAction action) |
416 |
{ |
417 |
if (accountInfo==null) |
418 |
throw new ArgumentNullException("accountInfo"); |
419 |
if (action==null) |
420 |
throw new ArgumentNullException("action"); |
421 |
if (action.CloudFile==null) |
422 |
throw new ArgumentException("CloudFile","action"); |
423 |
if (action.LocalFile==null) |
424 |
throw new ArgumentException("LocalFile","action"); |
425 |
if (action.OldLocalFile==null) |
426 |
throw new ArgumentException("OldLocalFile","action"); |
427 |
if (action.OldCloudFile==null) |
428 |
throw new ArgumentException("OldCloudFile","action"); |
429 |
Contract.EndContractBlock(); |
430 |
|
431 |
using (ThreadContext.Stacks["Operation"].Push("RenameCloudFile")) |
432 |
{ |
433 |
|
434 |
var newFilePath = action.LocalFile.FullName; |
435 |
|
436 |
//How do we handle concurrent renames and deletes/uploads/downloads? |
437 |
//* A conflicting upload means that a file was renamed before it had a chance to finish uploading |
438 |
// This should never happen as the network agent executes only one action at a time |
439 |
//* A conflicting download means that the file was modified on the cloud. While we can go on and complete |
440 |
// the rename, there may be a problem if the file is downloaded in blocks, as subsequent block requests for the |
441 |
// same name will fail. |
442 |
// This should never happen as the network agent executes only one action at a time. |
443 |
//* A conflicting delete can happen if the rename was followed by a delete action that didn't have the chance |
444 |
// to remove the rename from the queue. |
445 |
// We can probably ignore this case. It will result in an error which should be ignored |
446 |
|
447 |
|
448 |
//The local file is already renamed |
449 |
StatusKeeper.SetFileOverlayStatus(newFilePath, FileOverlayStatus.Modified); |
450 |
|
451 |
|
452 |
var account = action.CloudFile.Account ?? accountInfo.UserName; |
453 |
var container = action.CloudFile.Container; |
454 |
|
455 |
var client = new CloudFilesClient(accountInfo); |
456 |
//TODO: What code is returned when the source file doesn't exist? |
457 |
client.MoveObject(account, container, action.OldCloudFile.Name, container, action.CloudFile.Name); |
458 |
|
459 |
StatusKeeper.SetFileStatus(newFilePath, FileStatus.Unchanged); |
460 |
StatusKeeper.SetFileOverlayStatus(newFilePath, FileOverlayStatus.Normal); |
461 |
NativeMethods.RaiseChangeNotification(newFilePath); |
462 |
} |
463 |
} |
464 |
|
465 |
//Download a file. |
466 |
private async Task DownloadCloudFile(AccountInfo accountInfo, ObjectInfo cloudFile , string filePath) |
467 |
{ |
468 |
if (accountInfo == null) |
469 |
throw new ArgumentNullException("accountInfo"); |
470 |
if (cloudFile == null) |
471 |
throw new ArgumentNullException("cloudFile"); |
472 |
if (String.IsNullOrWhiteSpace(cloudFile.Account)) |
473 |
throw new ArgumentNullException("cloudFile"); |
474 |
if (String.IsNullOrWhiteSpace(cloudFile.Container)) |
475 |
throw new ArgumentNullException("cloudFile"); |
476 |
if (String.IsNullOrWhiteSpace(filePath)) |
477 |
throw new ArgumentNullException("filePath"); |
478 |
if (!Path.IsPathRooted(filePath)) |
479 |
throw new ArgumentException("The filePath must be rooted", "filePath"); |
480 |
Contract.EndContractBlock(); |
481 |
|
482 |
using (ThreadContext.Stacks["Operation"].Push("DownloadCloudFile")) |
483 |
{ |
484 |
|
485 |
var localPath = Interfaces.FileInfoExtensions.GetProperFilePathCapitalization(filePath); |
486 |
var relativeUrl = new Uri(cloudFile.Name, UriKind.Relative); |
487 |
|
488 |
var url = relativeUrl.ToString(); |
489 |
if (cloudFile.Name.EndsWith(".ignore", StringComparison.InvariantCultureIgnoreCase)) |
490 |
return; |
491 |
|
492 |
|
493 |
//Are we already downloading or uploading the file? |
494 |
using (var gate = NetworkGate.Acquire(localPath, NetworkOperation.Downloading)) |
495 |
{ |
496 |
if (gate.Failed) |
497 |
return; |
498 |
|
499 |
var client = new CloudFilesClient(accountInfo); |
500 |
var account = cloudFile.Account; |
501 |
var container = cloudFile.Container; |
502 |
|
503 |
if (cloudFile.Content_Type == @"application/directory") |
504 |
{ |
505 |
if (!Directory.Exists(localPath)) |
506 |
try |
507 |
{ |
508 |
Directory.CreateDirectory(localPath); |
509 |
if (Log.IsDebugEnabled) |
510 |
Log.DebugFormat("Created Directory [{0}]",localPath); |
511 |
} |
512 |
catch (IOException) |
513 |
{ |
514 |
var localInfo = new FileInfo(localPath); |
515 |
if (localInfo.Exists && localInfo.Length == 0) |
516 |
{ |
517 |
Log.WarnFormat("Malformed directory object detected for [{0}]",localPath); |
518 |
localInfo.Delete(); |
519 |
Directory.CreateDirectory(localPath); |
520 |
if (Log.IsDebugEnabled) |
521 |
Log.DebugFormat("Created Directory [{0}]", localPath); |
522 |
} |
523 |
} |
524 |
} |
525 |
else |
526 |
{ |
527 |
var isChanged = IsObjectChanged(cloudFile, localPath); |
528 |
if (isChanged) |
529 |
{ |
530 |
//Retrieve the hashmap from the server |
531 |
var serverHash = await client.GetHashMap(account, container, url); |
532 |
//If it's a small file |
533 |
if (serverHash.Hashes.Count == 1) |
534 |
//Download it in one go |
535 |
await |
536 |
DownloadEntireFileAsync(accountInfo, client, cloudFile, relativeUrl, localPath, |
537 |
serverHash); |
538 |
//Otherwise download it block by block |
539 |
else |
540 |
await |
541 |
DownloadWithBlocks(accountInfo, client, cloudFile, relativeUrl, localPath, |
542 |
serverHash); |
543 |
|
544 |
if (cloudFile.AllowedTo == "read") |
545 |
{ |
546 |
var attributes = File.GetAttributes(localPath); |
547 |
File.SetAttributes(localPath, attributes | FileAttributes.ReadOnly); |
548 |
} |
549 |
} |
550 |
} |
551 |
|
552 |
//Now we can store the object's metadata without worrying about ghost status entries |
553 |
StatusKeeper.StoreInfo(localPath, cloudFile); |
554 |
|
555 |
} |
556 |
} |
557 |
} |
558 |
|
559 |
private bool IsObjectChanged(ObjectInfo cloudFile, string localPath) |
560 |
{ |
561 |
//If the target is a directory, there are no changes to download |
562 |
if (Directory.Exists(localPath)) |
563 |
return false; |
564 |
//If the file doesn't exist, we have a chagne |
565 |
if (!File.Exists(localPath)) |
566 |
return true; |
567 |
//If there is no stored state, we have a change |
568 |
var localState = StatusKeeper.GetStateByFilePath(localPath); |
569 |
if (localState == null) |
570 |
return true; |
571 |
|
572 |
var info = new FileInfo(localPath); |
573 |
var shortHash = info.ComputeShortHash(); |
574 |
//If the file is different from the stored state, we have a change |
575 |
if (localState.ShortHash != shortHash) |
576 |
return true; |
577 |
//If the top hashes differ, we have a change |
578 |
return (localState.Checksum != cloudFile.Hash); |
579 |
} |
580 |
|
581 |
//Download a small file with a single GET operation |
582 |
private async Task DownloadEntireFileAsync(AccountInfo accountInfo, CloudFilesClient client, ObjectInfo cloudFile, Uri relativeUrl, string filePath,TreeHash serverHash) |
583 |
{ |
584 |
if (client == null) |
585 |
throw new ArgumentNullException("client"); |
586 |
if (cloudFile==null) |
587 |
throw new ArgumentNullException("cloudFile"); |
588 |
if (relativeUrl == null) |
589 |
throw new ArgumentNullException("relativeUrl"); |
590 |
if (String.IsNullOrWhiteSpace(filePath)) |
591 |
throw new ArgumentNullException("filePath"); |
592 |
if (!Path.IsPathRooted(filePath)) |
593 |
throw new ArgumentException("The localPath must be rooted", "filePath"); |
594 |
Contract.EndContractBlock(); |
595 |
|
596 |
var localPath = Pithos.Interfaces.FileInfoExtensions.GetProperFilePathCapitalization(filePath); |
597 |
StatusNotification.SetPithosStatus(PithosStatus.LocalSyncing,String.Format("Downloading {0}",Path.GetFileName(localPath))); |
598 |
StatusNotification.Notify(new CloudNotification { Data = cloudFile }); |
599 |
|
600 |
var fileAgent = GetFileAgent(accountInfo); |
601 |
//Calculate the relative file path for the new file |
602 |
var relativePath = relativeUrl.RelativeUriToFilePath(); |
603 |
//The file will be stored in a temporary location while downloading with an extension .download |
604 |
var tempPath = Path.Combine(fileAgent.CachePath, relativePath + ".download"); |
605 |
//Make sure the target folder exists. DownloadFileTask will not create the folder |
606 |
var tempFolder = Path.GetDirectoryName(tempPath); |
607 |
if (!Directory.Exists(tempFolder)) |
608 |
Directory.CreateDirectory(tempFolder); |
609 |
|
610 |
//Download the object to the temporary location |
611 |
await client.GetObject(cloudFile.Account, cloudFile.Container, relativeUrl.ToString(), tempPath); |
612 |
|
613 |
//Create the local folder if it doesn't exist (necessary for shared objects) |
614 |
var localFolder = Path.GetDirectoryName(localPath); |
615 |
if (!Directory.Exists(localFolder)) |
616 |
try |
617 |
{ |
618 |
Directory.CreateDirectory(localFolder); |
619 |
} |
620 |
catch (IOException) |
621 |
{ |
622 |
//A file may already exist that has the same name as the new folder. |
623 |
//This may be an artifact of the way Pithos handles directories |
624 |
var fileInfo = new FileInfo(localFolder); |
625 |
if (fileInfo.Exists && fileInfo.Length == 0) |
626 |
{ |
627 |
fileInfo.Delete(); |
628 |
Directory.CreateDirectory(localFolder); |
629 |
} |
630 |
else |
631 |
throw; |
632 |
} |
633 |
//And move it to its actual location once downloading is finished |
634 |
if (File.Exists(localPath)) |
635 |
File.Replace(tempPath,localPath,null,true); |
636 |
else |
637 |
File.Move(tempPath,localPath); |
638 |
//Notify listeners that a local file has changed |
639 |
StatusNotification.NotifyChangedFile(localPath); |
640 |
|
641 |
|
642 |
} |
643 |
|
644 |
//Download a file asynchronously using blocks |
645 |
public async Task DownloadWithBlocks(AccountInfo accountInfo, CloudFilesClient client, ObjectInfo cloudFile, Uri relativeUrl, string filePath, TreeHash serverHash) |
646 |
{ |
647 |
if (client == null) |
648 |
throw new ArgumentNullException("client"); |
649 |
if (cloudFile == null) |
650 |
throw new ArgumentNullException("cloudFile"); |
651 |
if (relativeUrl == null) |
652 |
throw new ArgumentNullException("relativeUrl"); |
653 |
if (String.IsNullOrWhiteSpace(filePath)) |
654 |
throw new ArgumentNullException("filePath"); |
655 |
if (!Path.IsPathRooted(filePath)) |
656 |
throw new ArgumentException("The filePath must be rooted", "filePath"); |
657 |
if (serverHash == null) |
658 |
throw new ArgumentNullException("serverHash"); |
659 |
Contract.EndContractBlock(); |
660 |
|
661 |
var fileAgent = GetFileAgent(accountInfo); |
662 |
var localPath = Interfaces.FileInfoExtensions.GetProperFilePathCapitalization(filePath); |
663 |
|
664 |
//Calculate the relative file path for the new file |
665 |
var relativePath = relativeUrl.RelativeUriToFilePath(); |
666 |
var blockUpdater = new BlockUpdater(fileAgent.CachePath, localPath, relativePath, serverHash); |
667 |
|
668 |
|
669 |
StatusNotification.SetPithosStatus(PithosStatus.LocalSyncing,String.Format("Calculating hashmap for {0} before download",Path.GetFileName(localPath))); |
670 |
//Calculate the file's treehash |
671 |
var treeHash = await Signature.CalculateTreeHashAsync(localPath, serverHash.BlockSize, serverHash.BlockHash, 2); |
672 |
|
673 |
//And compare it with the server's hash |
674 |
var upHashes = serverHash.GetHashesAsStrings(); |
675 |
var localHashes = treeHash.HashDictionary; |
676 |
ReportDownloadProgress(Path.GetFileName(localPath),0,upHashes.Length,cloudFile.Bytes); |
677 |
for (int i = 0; i < upHashes.Length; i++) |
678 |
{ |
679 |
//For every non-matching hash |
680 |
var upHash = upHashes[i]; |
681 |
if (!localHashes.ContainsKey(upHash)) |
682 |
{ |
683 |
StatusNotification.Notify(new CloudNotification { Data = cloudFile }); |
684 |
|
685 |
if (blockUpdater.UseOrphan(i, upHash)) |
686 |
{ |
687 |
Log.InfoFormat("[BLOCK GET] ORPHAN FOUND for {0} of {1} for {2}", i, upHashes.Length, localPath); |
688 |
continue; |
689 |
} |
690 |
Log.InfoFormat("[BLOCK GET] START {0} of {1} for {2}", i, upHashes.Length, localPath); |
691 |
var start = i*serverHash.BlockSize; |
692 |
//To download the last block just pass a null for the end of the range |
693 |
long? end = null; |
694 |
if (i < upHashes.Length - 1 ) |
695 |
end= ((i + 1)*serverHash.BlockSize) ; |
696 |
|
697 |
//Download the missing block |
698 |
var block = await client.GetBlock(cloudFile.Account, cloudFile.Container, relativeUrl, start, end); |
699 |
|
700 |
//and store it |
701 |
blockUpdater.StoreBlock(i, block); |
702 |
|
703 |
|
704 |
Log.InfoFormat("[BLOCK GET] FINISH {0} of {1} for {2}", i, upHashes.Length, localPath); |
705 |
} |
706 |
ReportDownloadProgress(Path.GetFileName(localPath), i, upHashes.Length, cloudFile.Bytes); |
707 |
} |
708 |
|
709 |
//Want to avoid notifications if no changes were made |
710 |
var hasChanges = blockUpdater.HasBlocks; |
711 |
blockUpdater.Commit(); |
712 |
|
713 |
if (hasChanges) |
714 |
//Notify listeners that a local file has changed |
715 |
StatusNotification.NotifyChangedFile(localPath); |
716 |
|
717 |
Log.InfoFormat("[BLOCK GET] COMPLETE {0}", localPath); |
718 |
} |
719 |
|
720 |
|
721 |
private async Task UploadCloudFile(CloudAction action) |
722 |
{ |
723 |
if (action == null) |
724 |
throw new ArgumentNullException("action"); |
725 |
Contract.EndContractBlock(); |
726 |
using(ThreadContext.Stacks["Operation"].Push("UploadCloudFile")) |
727 |
{ |
728 |
try |
729 |
{ |
730 |
|
731 |
var accountInfo = action.AccountInfo; |
732 |
|
733 |
var fileInfo = action.LocalFile; |
734 |
|
735 |
if (fileInfo.Extension.Equals("ignore", StringComparison.InvariantCultureIgnoreCase)) |
736 |
return; |
737 |
|
738 |
// |
739 |
if (action.FileState == null) |
740 |
action.FileState = StatusKeeper.GetStateByFilePath(fileInfo.FullName); |
741 |
if (action.FileState == null) |
742 |
{ |
743 |
Log.WarnFormat("File [{0}] has no local state. It was probably created by a download action",fileInfo.FullName); |
744 |
return; |
745 |
} |
746 |
//Do not upload files in conflict |
747 |
if (action.FileState.FileStatus == FileStatus.Conflict ) |
748 |
{ |
749 |
Log.InfoFormat("Skipping file in conflict [{0}]",fileInfo.FullName); |
750 |
return; |
751 |
} |
752 |
if (action.FileState.FileStatus == FileStatus.Forbidden) |
753 |
{ |
754 |
Log.InfoFormat("Skipping forbidden file [{0}]",fileInfo.FullName); |
755 |
return; |
756 |
} |
757 |
|
758 |
var relativePath = fileInfo.AsRelativeTo(accountInfo.AccountPath); |
759 |
if (relativePath.StartsWith(FolderConstants.OthersFolder)) |
760 |
{ |
761 |
var parts = relativePath.Split('\\'); |
762 |
var accountName = parts[1]; |
763 |
var oldName = accountInfo.UserName; |
764 |
var absoluteUri = accountInfo.StorageUri.AbsoluteUri; |
765 |
var nameIndex = absoluteUri.IndexOf(oldName, StringComparison.Ordinal); |
766 |
var root = absoluteUri.Substring(0, nameIndex); |
767 |
|
768 |
accountInfo = new AccountInfo |
769 |
{ |
770 |
UserName = accountName, |
771 |
AccountPath = Path.Combine(accountInfo.AccountPath, parts[0], parts[1]), |
772 |
StorageUri = new Uri(root + accountName), |
773 |
BlockHash = accountInfo.BlockHash, |
774 |
BlockSize = accountInfo.BlockSize, |
775 |
Token = accountInfo.Token |
776 |
}; |
777 |
} |
778 |
|
779 |
|
780 |
var fullFileName = fileInfo.GetProperCapitalization(); |
781 |
using (var gate = NetworkGate.Acquire(fullFileName, NetworkOperation.Uploading)) |
782 |
{ |
783 |
//Abort if the file is already being uploaded or downloaded |
784 |
if (gate.Failed) |
785 |
return; |
786 |
|
787 |
var cloudFile = action.CloudFile; |
788 |
var account = cloudFile.Account ?? accountInfo.UserName; |
789 |
try |
790 |
{ |
791 |
|
792 |
var client = new CloudFilesClient(accountInfo); |
793 |
//Even if GetObjectInfo times out, we can proceed with the upload |
794 |
var cloudInfo = client.GetObjectInfo(account, cloudFile.Container, cloudFile.Name); |
795 |
|
796 |
//If this is a read-only file, do not upload changes |
797 |
if (cloudInfo.AllowedTo == "read") |
798 |
return; |
799 |
|
800 |
//TODO: Check how a directory hash is calculated -> All dirs seem to have the same hash |
801 |
if (fileInfo is DirectoryInfo) |
802 |
{ |
803 |
//If the directory doesn't exist the Hash property will be empty |
804 |
if (String.IsNullOrWhiteSpace(cloudInfo.Hash)) |
805 |
//Go on and create the directory |
806 |
await |
807 |
client.PutObject(account, cloudFile.Container, cloudFile.Name, fullFileName, |
808 |
String.Empty, "application/directory"); |
809 |
} |
810 |
else |
811 |
{ |
812 |
|
813 |
var cloudHash = cloudInfo.Hash.ToLower(); |
814 |
|
815 |
StatusNotification.Notify(new StatusNotification(String.Format("Hashing {0} for Upload",fileInfo.Name))); |
816 |
|
817 |
//TODO: This is the same as the calculation for the Local Hash! |
818 |
//First, calculate the tree hash |
819 |
/* |
820 |
var treeHash = await Signature.CalculateTreeHashAsync(fullFileName, accountInfo.BlockSize, |
821 |
accountInfo.BlockHash, 2); |
822 |
*/ |
823 |
|
824 |
|
825 |
var treeHash = action.TreeHash.Value; |
826 |
var topHash = treeHash.TopHash.ToHashString(); |
827 |
|
828 |
//var topHash = action.TopHash.Value; |
829 |
|
830 |
//If the file hashes match, abort the upload |
831 |
if (topHash == cloudHash /*|| topHash == cloudHash*/) |
832 |
{ |
833 |
//but store any metadata changes |
834 |
StatusKeeper.StoreInfo(fullFileName, cloudInfo); |
835 |
Log.InfoFormat("Skip upload of {0}, hashes match", fullFileName); |
836 |
return; |
837 |
} |
838 |
|
839 |
|
840 |
//Mark the file as modified while we upload it |
841 |
StatusKeeper.SetFileOverlayStatus(fullFileName, FileOverlayStatus.Modified); |
842 |
//And then upload it |
843 |
|
844 |
//Upload even small files using the Hashmap. The server may already contain |
845 |
//the relevant block |
846 |
|
847 |
//TODO: If the upload fails with a 403, abort it and mark conflict |
848 |
|
849 |
await |
850 |
UploadWithHashMap(accountInfo, cloudFile, fileInfo as FileInfo, cloudFile.Name, treeHash); |
851 |
} |
852 |
//If everything succeeds, change the file and overlay status to normal |
853 |
StatusKeeper.SetFileState(fullFileName, FileStatus.Unchanged, FileOverlayStatus.Normal); |
854 |
} |
855 |
catch (WebException exc) |
856 |
{ |
857 |
var response=(exc.Response as HttpWebResponse); |
858 |
if (response.StatusCode == HttpStatusCode.Forbidden) |
859 |
{ |
860 |
StatusKeeper.SetFileState(fileInfo.FullName,FileStatus.Forbidden, FileOverlayStatus.Conflict); |
861 |
} |
862 |
} |
863 |
} |
864 |
//Notify the Shell to update the overlays |
865 |
NativeMethods.RaiseChangeNotification(fullFileName); |
866 |
StatusNotification.NotifyChangedFile(fullFileName); |
867 |
} |
868 |
catch (AggregateException ex) |
869 |
{ |
870 |
var exc = ex.InnerException as WebException; |
871 |
if (exc == null) |
872 |
throw ex.InnerException; |
873 |
if (HandleUploadWebException(action, exc)) |
874 |
return; |
875 |
throw; |
876 |
} |
877 |
catch (WebException ex) |
878 |
{ |
879 |
if (HandleUploadWebException(action, ex)) |
880 |
return; |
881 |
throw; |
882 |
} |
883 |
catch (Exception ex) |
884 |
{ |
885 |
Log.Error("Unexpected error while uploading file", ex); |
886 |
throw; |
887 |
} |
888 |
} |
889 |
} |
890 |
|
891 |
|
892 |
|
893 |
private bool HandleUploadWebException(CloudAction action, WebException exc) |
894 |
{ |
895 |
var response = exc.Response as HttpWebResponse; |
896 |
if (response == null) |
897 |
throw exc; |
898 |
if (response.StatusCode == HttpStatusCode.Unauthorized) |
899 |
{ |
900 |
Log.Error("Not allowed to upload file", exc); |
901 |
var message = String.Format("Not allowed to uplad file {0}", action.LocalFile.FullName); |
902 |
StatusKeeper.SetFileState(action.LocalFile.FullName, FileStatus.Unchanged, FileOverlayStatus.Normal); |
903 |
StatusNotification.NotifyChange(message, TraceLevel.Warning); |
904 |
return true; |
905 |
} |
906 |
return false; |
907 |
} |
908 |
|
909 |
public async Task UploadWithHashMap(AccountInfo accountInfo,ObjectInfo cloudFile,FileInfo fileInfo,string url,TreeHash treeHash) |
910 |
{ |
911 |
if (accountInfo == null) |
912 |
throw new ArgumentNullException("accountInfo"); |
913 |
if (cloudFile==null) |
914 |
throw new ArgumentNullException("cloudFile"); |
915 |
if (fileInfo == null) |
916 |
throw new ArgumentNullException("fileInfo"); |
917 |
if (String.IsNullOrWhiteSpace(url)) |
918 |
throw new ArgumentNullException(url); |
919 |
if (treeHash==null) |
920 |
throw new ArgumentNullException("treeHash"); |
921 |
if (String.IsNullOrWhiteSpace(cloudFile.Container) ) |
922 |
throw new ArgumentException("Invalid container","cloudFile"); |
923 |
Contract.EndContractBlock(); |
924 |
|
925 |
StatusNotification.Notify(new StatusNotification(String.Format("Uploading {0} for Upload", fileInfo.Name))); |
926 |
|
927 |
var fullFileName = fileInfo.GetProperCapitalization(); |
928 |
|
929 |
var account = cloudFile.Account ?? accountInfo.UserName; |
930 |
var container = cloudFile.Container ; |
931 |
|
932 |
var client = new CloudFilesClient(accountInfo); |
933 |
//Send the hashmap to the server |
934 |
var missingHashes = await client.PutHashMap(account, container, url, treeHash); |
935 |
int block = 0; |
936 |
ReportUploadProgress(fileInfo.Name,block++, missingHashes.Count, fileInfo.Length); |
937 |
//If the server returns no missing hashes, we are done |
938 |
while (missingHashes.Count > 0) |
939 |
{ |
940 |
|
941 |
var buffer = new byte[accountInfo.BlockSize]; |
942 |
foreach (var missingHash in missingHashes) |
943 |
{ |
944 |
//Find the proper block |
945 |
var blockIndex = treeHash.HashDictionary[missingHash]; |
946 |
var offset = blockIndex*accountInfo.BlockSize; |
947 |
|
948 |
var read = fileInfo.Read(buffer, offset, accountInfo.BlockSize); |
949 |
|
950 |
try |
951 |
{ |
952 |
//And upload the block |
953 |
await client.PostBlock(account, container, buffer, 0, read); |
954 |
Log.InfoFormat("[BLOCK] Block {0} of {1} uploaded", blockIndex, fullFileName); |
955 |
} |
956 |
catch (Exception exc) |
957 |
{ |
958 |
Log.Error(String.Format("Uploading block {0} of {1}", blockIndex, fullFileName), exc); |
959 |
} |
960 |
ReportUploadProgress(fileInfo.Name,block++, missingHashes.Count, fileInfo.Length); |
961 |
} |
962 |
|
963 |
//Repeat until there are no more missing hashes |
964 |
missingHashes = await client.PutHashMap(account, container, url, treeHash); |
965 |
} |
966 |
|
967 |
ReportUploadProgress(fileInfo.Name, missingHashes.Count, missingHashes.Count, fileInfo.Length); |
968 |
} |
969 |
|
970 |
private void ReportUploadProgress(string fileName,int block, int totalBlocks, long fileSize) |
971 |
{ |
972 |
StatusNotification.Notify(totalBlocks == 0 |
973 |
? new ProgressNotification(fileName, "Uploading", 1, 1, fileSize) |
974 |
: new ProgressNotification(fileName, "Uploading", block, totalBlocks, fileSize)); |
975 |
} |
976 |
|
977 |
private void ReportDownloadProgress(string fileName,int block, int totalBlocks, long fileSize) |
978 |
{ |
979 |
StatusNotification.Notify(totalBlocks == 0 |
980 |
? new ProgressNotification(fileName, "Downloading", 1, 1, fileSize) |
981 |
: new ProgressNotification(fileName, "Downloading", block, totalBlocks, fileSize)); |
982 |
} |
983 |
} |
984 |
|
985 |
|
986 |
|
987 |
|
988 |
} |