root / trunk / Pithos.Core / Agents / NetworkAgent.cs @ 3c76f045
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// ----------------------------------------------------------------------- |
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// <copyright file="NetworkAgent.cs" company="GRNET"> |
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// Copyright 2011 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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// 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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using System; |
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using System.Collections.Concurrent; |
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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.Linq; |
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using System.Net; |
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using System.Threading.Tasks; |
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using System.Threading.Tasks.Dataflow; |
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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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//TODO: Ensure all network operations use exact casing. Pithos is case sensitive |
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[Export] |
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public class NetworkAgent |
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{ |
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private Agent<CloudAction> _agent; |
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|
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//A separate agent is used to execute delete actions immediatelly; |
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private ActionBlock<CloudDeleteAction> _deleteAgent; |
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readonly ConcurrentDictionary<string,DateTime> _deletedFiles=new ConcurrentDictionary<string, DateTime>(); |
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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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private static readonly ILog Log = LogManager.GetLogger("NetworkAgent"); |
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|
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private readonly ConcurrentBag<AccountInfo> _accounts = new ConcurrentBag<AccountInfo>(); |
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|
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public void Start() |
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{ |
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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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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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_deleteAgent = new ActionBlock<CloudDeleteAction>(message =>ProcessDelete(message),new ExecutionDataflowBlockOptions{MaxDegreeOfParallelism=4}); |
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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(ProcessDelete,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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var accountInfo = action.AccountInfo; |
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|
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using (log4net.ThreadContext.Stacks["NETWORK"].Push("PROCESS")) |
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{ |
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Log.InfoFormat("[ACTION] Start Processing {0}", action); |
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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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|
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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 (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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this.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.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("[ACTION] 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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} |
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} |
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|
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/// <summary> |
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/// Processes cloud delete actions |
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/// </summary> |
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/// <param name="action">The delete action to execute</param> |
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/// <returns></returns> |
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/// <remarks> |
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/// When a file/folder is deleted locally, we must delete it ASAP from the server and block any download |
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/// operations that may be in progress. |
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/// <para> |
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/// A separate agent is used to process deletes because the main agent may be busy with a long operation. |
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/// </para> |
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/// </remarks> |
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private async Task ProcessDelete(CloudDeleteAction 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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var accountInfo = action.AccountInfo; |
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|
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using (log4net.ThreadContext.Stacks["NETWORK"].Push("PROCESS")) |
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{ |
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Log.InfoFormat("[ACTION] Start Processing {0}", action); |
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|
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var cloudFile = action.CloudFile; |
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|
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try |
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{ |
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//Acquire a lock on the deleted file to prevent uploading/downloading operations from the normal |
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//agent |
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using (var gate = NetworkGate.Acquire(action.LocalFile.FullName, NetworkOperation.Deleting)) |
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{ |
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|
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//Add the file URL to the deleted files list |
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var key = GetFileKey(action.CloudFile); |
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_deletedFiles[key]=DateTime.Now; |
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|
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|
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// and then delete the file from the server |
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DeleteCloudFile(accountInfo, cloudFile); |
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|
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Log.InfoFormat("[ACTION] End Delete {0}:{1}->{2}", action.Action, action.LocalFile, |
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action.CloudFile.Name); |
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} |
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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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//Repost a delete action for the missing file |
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_deleteAgent.Post(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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_deleteAgent.Post(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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_deleteAgent.Post(action); |
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} |
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} |
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} |
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|
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private static string GetFileKey(ObjectInfo info) |
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{ |
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var key = String.Format("{0}/{1}/{2}", info.Account, info.Container,info.Name); |
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return key; |
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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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|
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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 localHash = action.LocalHash.Value.ToLower(); |
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var topHash = action.TopHash.Value.ToLower(); |
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|
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//Not enough to compare only the local hashes, also have to compare the tophashes |
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|
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//If any of the hashes match, we are done |
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if ((cloudHash == localHash || cloudHash == topHash)) |
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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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var lastLocalTime = localFile.LastWriteTime; |
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var lastUpTime = cloudFile.Last_Modified; |
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|
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//If the local file is newer upload it |
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if (lastUpTime <= lastLocalTime) |
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{ |
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//It probably means it was changed while the app was down |
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UploadCloudFile(action); |
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} |
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else |
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{ |
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//It the cloud file has a later date, it was modified by another user or computer. |
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//We need to check the local file's status |
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var status = StatusKeeper.GetFileStatus(downloadPath); |
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switch (status) |
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{ |
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case FileStatus.Unchanged: |
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//If the local file's status is Unchanged, we can go on and download the newer cloud file |
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await DownloadCloudFile(accountInfo,cloudFile,downloadPath); |
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break; |
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case FileStatus.Modified: |
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//If the local file is Modified, we may have a conflict. In this case we should mark the file as Conflict |
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//We can't ensure that a file modified online since the last time will appear as Modified, unless we |
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//index all files before we start listening. |
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case FileStatus.Created: |
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//If the local file is Created, it means that the local and cloud files aren't related, |
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// yet they have the same name. |
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|
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//In both cases we must mark the file as in conflict |
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ReportConflict(downloadPath); |
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break; |
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default: |
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//Other cases should never occur. Mark them as Conflict as well but log a warning |
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ReportConflict(downloadPath); |
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Log.WarnFormat("Unexcepted status {0} for file {1}->{2}", status, |
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downloadPath, action.CloudFile.Name); |
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break; |
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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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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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//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; |
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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).Result |
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.TopHash.ToHashString()); |
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else |
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{ |
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cloudAction.TopHash = new Lazy<string>(() => cloudAction.LocalHash.Value); |
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} |
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} |
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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); |
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} |
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|
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if (cloudAction is CloudDeleteAction) |
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_deleteAgent.Post((CloudDeleteAction)cloudAction); |
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else |
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_agent.Post(cloudAction); |
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} |
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|
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/* class ObjectInfoByNameComparer:IEqualityComparer<ObjectInfo> |
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{ |
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public bool Equals(ObjectInfo x, ObjectInfo y) |
406 |
{ |
407 |
return x.Name.Equals(y.Name,StringComparison.InvariantCultureIgnoreCase); |
408 |
} |
409 |
|
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public int GetHashCode(ObjectInfo obj) |
411 |
{ |
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return obj.Name.ToLower().GetHashCode(); |
413 |
} |
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}*/ |
415 |
|
416 |
|
417 |
|
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//Remote files are polled periodically. Any changes are processed |
419 |
public async Task ProcessRemoteFiles(DateTime? since = null) |
420 |
{ |
421 |
await TaskEx.Delay(TimeSpan.FromSeconds(10),_agent.CancellationToken); |
422 |
|
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using (log4net.ThreadContext.Stacks["Retrieve Remote"].Push("All accounts")) |
424 |
{ |
425 |
|
426 |
try |
427 |
{ |
428 |
//Next time we will check for all changes since the current check minus 1 second |
429 |
//This is done to ensure there are no discrepancies due to clock differences |
430 |
DateTime nextSince = DateTime.Now.AddSeconds(-1); |
431 |
|
432 |
var tasks = from accountInfo in _accounts |
433 |
select ProcessAccountFiles(accountInfo, since); |
434 |
|
435 |
await TaskEx.WhenAll(tasks.ToList()); |
436 |
|
437 |
ProcessRemoteFiles(nextSince); |
438 |
} |
439 |
catch (Exception ex) |
440 |
{ |
441 |
Log.ErrorFormat("Error while processing accounts\r\n{0}",ex); |
442 |
//In case of failure retry with the same parameter |
443 |
ProcessRemoteFiles(since); |
444 |
} |
445 |
|
446 |
|
447 |
} |
448 |
} |
449 |
|
450 |
public async Task ProcessAccountFiles(AccountInfo accountInfo,DateTime? since=null) |
451 |
{ |
452 |
if (accountInfo==null) |
453 |
throw new ArgumentNullException("accountInfo"); |
454 |
if (String.IsNullOrWhiteSpace(accountInfo.AccountPath)) |
455 |
throw new ArgumentException("The AccountInfo.AccountPath is empty","accountInfo"); |
456 |
Contract.EndContractBlock(); |
457 |
|
458 |
using (log4net.ThreadContext.Stacks["Retrieve Remote"].Push(accountInfo.UserName)) |
459 |
{ |
460 |
Log.Info("Scheduled"); |
461 |
var client=new CloudFilesClient(accountInfo); |
462 |
|
463 |
var containers = client.ListContainers(accountInfo.UserName); |
464 |
|
465 |
CreateContainerFolders(accountInfo, containers); |
466 |
|
467 |
try |
468 |
{ |
469 |
|
470 |
//Get the list of server objects changed since the last check |
471 |
//The name of the container is passed as state in order to create a dictionary of tasks in a subsequent step |
472 |
var listObjects = from container in containers |
473 |
select Task<IList<ObjectInfo>>.Factory.StartNew(_ => |
474 |
client.ListObjects(accountInfo.UserName,container.Name, since),container.Name); |
475 |
|
476 |
|
477 |
var listTasks = await Task.Factory.WhenAll(listObjects.ToArray()); |
478 |
|
479 |
using (log4net.ThreadContext.Stacks["SCHEDULE"].Push("Process Results")) |
480 |
{ |
481 |
var dict = listTasks.ToDictionary(t => t.AsyncState); |
482 |
|
483 |
//Get all non-trash objects. Remember, the container name is stored in AsyncState |
484 |
var remoteObjects = from objectList in listTasks |
485 |
where (string) objectList.AsyncState != "trash" |
486 |
from obj in objectList.Result |
487 |
select obj; |
488 |
|
489 |
var trashObjects = dict["trash"].Result; |
490 |
//var sharedObjects = ((Task<IList<ObjectInfo>>) task.Result[2]).Result; |
491 |
|
492 |
//Items with the same name, hash may be both in the container and the trash |
493 |
//Don't delete items that exist in the container |
494 |
var realTrash = from trash in trashObjects |
495 |
where |
496 |
!remoteObjects.Any( |
497 |
info => info.Name == trash.Name && info.Hash == trash.Hash) |
498 |
select trash; |
499 |
ProcessDeletedFiles(accountInfo, realTrash); |
500 |
|
501 |
|
502 |
var remote = from info in remoteObjects |
503 |
//.Union(sharedObjects) |
504 |
let name = info.Name |
505 |
where !name.EndsWith(".ignore", StringComparison.InvariantCultureIgnoreCase) && |
506 |
!name.StartsWith(FolderConstants.CacheFolder + "/", |
507 |
StringComparison.InvariantCultureIgnoreCase) |
508 |
select info; |
509 |
|
510 |
//Create a list of actions from the remote files |
511 |
var allActions = ObjectsToActions(accountInfo, remote); |
512 |
|
513 |
//And remove those that are already being processed by the agent |
514 |
var distinctActions = allActions |
515 |
.Except(_agent.GetEnumerable(), new PithosMonitor.LocalFileComparer()) |
516 |
.ToList(); |
517 |
|
518 |
//Queue all the actions |
519 |
foreach (var message in distinctActions) |
520 |
{ |
521 |
Post(message); |
522 |
} |
523 |
|
524 |
Log.Info("[LISTENER] End Processing"); |
525 |
} |
526 |
} |
527 |
catch (Exception ex) |
528 |
{ |
529 |
Log.ErrorFormat("[FAIL] ListObjects for{0} in ProcessRemoteFiles with {1}", accountInfo.UserName, ex); |
530 |
return; |
531 |
} |
532 |
|
533 |
Log.Info("[LISTENER] Finished"); |
534 |
|
535 |
} |
536 |
} |
537 |
|
538 |
private static void CreateContainerFolders(AccountInfo accountInfo, IEnumerable<ContainerInfo> containers) |
539 |
{ |
540 |
var containerPaths = from container in containers |
541 |
let containerPath = Path.Combine(accountInfo.AccountPath, container.Name) |
542 |
where container.Name != FolderConstants.TrashContainer && !Directory.Exists(containerPath) |
543 |
select containerPath; |
544 |
|
545 |
foreach (var path in containerPaths) |
546 |
{ |
547 |
Directory.CreateDirectory(path); |
548 |
} |
549 |
} |
550 |
|
551 |
//Creates an appropriate action for each server file |
552 |
private IEnumerable<CloudAction> ObjectsToActions(AccountInfo accountInfo,IEnumerable<ObjectInfo> remote) |
553 |
{ |
554 |
if (remote==null) |
555 |
throw new ArgumentNullException(); |
556 |
Contract.EndContractBlock(); |
557 |
var fileAgent = GetFileAgent(accountInfo); |
558 |
|
559 |
//In order to avoid multiple iterations over the files, we iterate only once |
560 |
//over the remote files |
561 |
foreach (var objectInfo in remote) |
562 |
{ |
563 |
var relativePath = objectInfo.RelativeUrlToFilePath(accountInfo.UserName); |
564 |
//and remove any matching objects from the list, adding them to the commonObjects list |
565 |
|
566 |
if (fileAgent.Exists(relativePath)) |
567 |
{ |
568 |
//If a directory object already exists, we don't need to perform any other action |
569 |
var localFile = fileAgent.GetFileSystemInfo(relativePath); |
570 |
if (objectInfo.Content_Type == @"application/directory" && localFile is DirectoryInfo) |
571 |
continue; |
572 |
using (new SessionScope(FlushAction.Never)) |
573 |
{ |
574 |
var state = StatusKeeper.GetStateByFilePath(localFile.FullName); |
575 |
//FileState.FindByFilePath(localFile.FullName); |
576 |
//Common files should be checked on a per-case basis to detect differences, which is newer |
577 |
|
578 |
yield return new CloudAction(accountInfo, CloudActionType.MustSynch, |
579 |
localFile, objectInfo, state, accountInfo.BlockSize, |
580 |
accountInfo.BlockHash); |
581 |
} |
582 |
} |
583 |
else |
584 |
{ |
585 |
//If there is no match we add them to the localFiles list |
586 |
//but only if the file is not marked for deletion |
587 |
var targetFile = Path.Combine(accountInfo.AccountPath, relativePath); |
588 |
var fileStatus = StatusKeeper.GetFileStatus(targetFile); |
589 |
if (fileStatus != FileStatus.Deleted) |
590 |
{ |
591 |
//Remote files should be downloaded |
592 |
yield return new CloudDownloadAction(accountInfo,objectInfo); |
593 |
} |
594 |
} |
595 |
} |
596 |
} |
597 |
|
598 |
private static FileAgent GetFileAgent(AccountInfo accountInfo) |
599 |
{ |
600 |
return AgentLocator<FileAgent>.Get(accountInfo.AccountPath); |
601 |
} |
602 |
|
603 |
private void ProcessDeletedFiles(AccountInfo accountInfo,IEnumerable<ObjectInfo> trashObjects) |
604 |
{ |
605 |
var fileAgent = GetFileAgent(accountInfo); |
606 |
foreach (var trashObject in trashObjects) |
607 |
{ |
608 |
var barePath = trashObject.RelativeUrlToFilePath(accountInfo.UserName); |
609 |
//HACK: Assume only the "pithos" container is used. Must find out what happens when |
610 |
//deleting a file from a different container |
611 |
var relativePath = Path.Combine("pithos", barePath); |
612 |
fileAgent.Delete(relativePath); |
613 |
} |
614 |
} |
615 |
|
616 |
|
617 |
private void RenameCloudFile(AccountInfo accountInfo,CloudMoveAction action) |
618 |
{ |
619 |
if (accountInfo==null) |
620 |
throw new ArgumentNullException("accountInfo"); |
621 |
if (action==null) |
622 |
throw new ArgumentNullException("action"); |
623 |
if (action.CloudFile==null) |
624 |
throw new ArgumentException("CloudFile","action"); |
625 |
if (action.LocalFile==null) |
626 |
throw new ArgumentException("LocalFile","action"); |
627 |
if (action.OldLocalFile==null) |
628 |
throw new ArgumentException("OldLocalFile","action"); |
629 |
if (action.OldCloudFile==null) |
630 |
throw new ArgumentException("OldCloudFile","action"); |
631 |
Contract.EndContractBlock(); |
632 |
|
633 |
|
634 |
var newFilePath = action.LocalFile.FullName; |
635 |
|
636 |
//How do we handle concurrent renames and deletes/uploads/downloads? |
637 |
//* A conflicting upload means that a file was renamed before it had a chance to finish uploading |
638 |
// This should never happen as the network agent executes only one action at a time |
639 |
//* A conflicting download means that the file was modified on the cloud. While we can go on and complete |
640 |
// the rename, there may be a problem if the file is downloaded in blocks, as subsequent block requests for the |
641 |
// same name will fail. |
642 |
// This should never happen as the network agent executes only one action at a time. |
643 |
//* A conflicting delete can happen if the rename was followed by a delete action that didn't have the chance |
644 |
// to remove the rename from the queue. |
645 |
// We can probably ignore this case. It will result in an error which should be ignored |
646 |
|
647 |
|
648 |
//The local file is already renamed |
649 |
StatusKeeper.SetFileOverlayStatus(newFilePath, FileOverlayStatus.Modified); |
650 |
|
651 |
|
652 |
var account = action.CloudFile.Account ?? accountInfo.UserName; |
653 |
var container = action.CloudFile.Container; |
654 |
|
655 |
var client = new CloudFilesClient(accountInfo); |
656 |
//TODO: What code is returned when the source file doesn't exist? |
657 |
client.MoveObject(account, container, action.OldCloudFile.Name, container, action.CloudFile.Name); |
658 |
|
659 |
StatusKeeper.SetFileStatus(newFilePath, FileStatus.Unchanged); |
660 |
StatusKeeper.SetFileOverlayStatus(newFilePath, FileOverlayStatus.Normal); |
661 |
NativeMethods.RaiseChangeNotification(newFilePath); |
662 |
} |
663 |
|
664 |
private void DeleteCloudFile(AccountInfo accountInfo, ObjectInfo cloudFile) |
665 |
{ |
666 |
if (accountInfo == null) |
667 |
throw new ArgumentNullException("accountInfo"); |
668 |
if (cloudFile==null) |
669 |
throw new ArgumentNullException("cloudFile"); |
670 |
|
671 |
if (String.IsNullOrWhiteSpace(cloudFile.Container)) |
672 |
throw new ArgumentException("Invalid container", "cloudFile"); |
673 |
Contract.EndContractBlock(); |
674 |
|
675 |
var fileAgent = GetFileAgent(accountInfo); |
676 |
|
677 |
using ( log4net.ThreadContext.Stacks["DeleteCloudFile"].Push("Delete")) |
678 |
{ |
679 |
var fileName= cloudFile.RelativeUrlToFilePath(accountInfo.UserName); |
680 |
var info = fileAgent.GetFileSystemInfo(fileName); |
681 |
var fullPath = info.FullName.ToLower(); |
682 |
|
683 |
StatusKeeper.SetFileOverlayStatus(fullPath, FileOverlayStatus.Modified); |
684 |
|
685 |
var account = cloudFile.Account ?? accountInfo.UserName; |
686 |
var container = cloudFile.Container ;//?? FolderConstants.PithosContainer; |
687 |
|
688 |
var client = new CloudFilesClient(accountInfo); |
689 |
client.DeleteObject(account, container, cloudFile.Name); |
690 |
|
691 |
StatusKeeper.ClearFileStatus(fullPath); |
692 |
} |
693 |
} |
694 |
|
695 |
//Download a file. |
696 |
private async Task DownloadCloudFile(AccountInfo accountInfo, ObjectInfo cloudFile , string filePath) |
697 |
{ |
698 |
if (accountInfo == null) |
699 |
throw new ArgumentNullException("accountInfo"); |
700 |
if (cloudFile == null) |
701 |
throw new ArgumentNullException("cloudFile"); |
702 |
if (String.IsNullOrWhiteSpace(cloudFile.Account)) |
703 |
throw new ArgumentNullException("cloudFile"); |
704 |
if (String.IsNullOrWhiteSpace(cloudFile.Container)) |
705 |
throw new ArgumentNullException("cloudFile"); |
706 |
if (String.IsNullOrWhiteSpace(filePath)) |
707 |
throw new ArgumentNullException("filePath"); |
708 |
if (!Path.IsPathRooted(filePath)) |
709 |
throw new ArgumentException("The filePath must be rooted", "filePath"); |
710 |
Contract.EndContractBlock(); |
711 |
|
712 |
var localPath = Interfaces.FileInfoExtensions.GetProperFilePathCapitalization(filePath); |
713 |
var relativeUrl = new Uri(cloudFile.Name, UriKind.Relative); |
714 |
|
715 |
var url = relativeUrl.ToString(); |
716 |
if (cloudFile.Name.EndsWith(".ignore", StringComparison.InvariantCultureIgnoreCase)) |
717 |
return; |
718 |
|
719 |
|
720 |
//Are we already downloading or uploading the file? |
721 |
using (var gate=NetworkGate.Acquire(localPath, NetworkOperation.Downloading)) |
722 |
{ |
723 |
if (gate.Failed) |
724 |
return; |
725 |
//The file's hashmap will be stored in the same location with the extension .hashmap |
726 |
//var hashPath = Path.Combine(FileAgent.CachePath, relativePath + ".hashmap"); |
727 |
|
728 |
var client = new CloudFilesClient(accountInfo); |
729 |
var account = cloudFile.Account; |
730 |
var container = cloudFile.Container; |
731 |
|
732 |
if (cloudFile.Content_Type == @"application/directory") |
733 |
{ |
734 |
if (!Directory.Exists(localPath)) |
735 |
Directory.CreateDirectory(localPath); |
736 |
} |
737 |
else |
738 |
{ |
739 |
//Retrieve the hashmap from the server |
740 |
var serverHash = await client.GetHashMap(account, container, url); |
741 |
//If it's a small file |
742 |
if (serverHash.Hashes.Count == 1) |
743 |
//Download it in one go |
744 |
await |
745 |
DownloadEntireFileAsync(accountInfo, client, cloudFile, relativeUrl, localPath, serverHash); |
746 |
//Otherwise download it block by block |
747 |
else |
748 |
await DownloadWithBlocks(accountInfo, client, cloudFile, relativeUrl, localPath, serverHash); |
749 |
|
750 |
if (cloudFile.AllowedTo == "read") |
751 |
{ |
752 |
var attributes = File.GetAttributes(localPath); |
753 |
File.SetAttributes(localPath, attributes | FileAttributes.ReadOnly); |
754 |
} |
755 |
} |
756 |
|
757 |
//Now we can store the object's metadata without worrying about ghost status entries |
758 |
StatusKeeper.StoreInfo(localPath, cloudFile); |
759 |
|
760 |
} |
761 |
} |
762 |
|
763 |
//Download a small file with a single GET operation |
764 |
private async Task DownloadEntireFileAsync(AccountInfo accountInfo, CloudFilesClient client, ObjectInfo cloudFile, Uri relativeUrl, string filePath,TreeHash serverHash) |
765 |
{ |
766 |
if (client == null) |
767 |
throw new ArgumentNullException("client"); |
768 |
if (cloudFile==null) |
769 |
throw new ArgumentNullException("cloudFile"); |
770 |
if (relativeUrl == null) |
771 |
throw new ArgumentNullException("relativeUrl"); |
772 |
if (String.IsNullOrWhiteSpace(filePath)) |
773 |
throw new ArgumentNullException("filePath"); |
774 |
if (!Path.IsPathRooted(filePath)) |
775 |
throw new ArgumentException("The localPath must be rooted", "filePath"); |
776 |
Contract.EndContractBlock(); |
777 |
|
778 |
var localPath = Pithos.Interfaces.FileInfoExtensions.GetProperFilePathCapitalization(filePath); |
779 |
//If the file already exists |
780 |
if (File.Exists(localPath)) |
781 |
{ |
782 |
//First check with MD5 as this is a small file |
783 |
var localMD5 = Signature.CalculateMD5(localPath); |
784 |
var cloudHash=serverHash.TopHash.ToHashString(); |
785 |
if (localMD5==cloudHash) |
786 |
return; |
787 |
//Then check with a treehash |
788 |
var localTreeHash = Signature.CalculateTreeHash(localPath, serverHash.BlockSize, serverHash.BlockHash); |
789 |
var localHash = localTreeHash.TopHash.ToHashString(); |
790 |
if (localHash==cloudHash) |
791 |
return; |
792 |
} |
793 |
|
794 |
var fileAgent = GetFileAgent(accountInfo); |
795 |
//Calculate the relative file path for the new file |
796 |
var relativePath = relativeUrl.RelativeUriToFilePath(); |
797 |
//The file will be stored in a temporary location while downloading with an extension .download |
798 |
var tempPath = Path.Combine(fileAgent.CachePath, relativePath + ".download"); |
799 |
//Make sure the target folder exists. DownloadFileTask will not create the folder |
800 |
var tempFolder = Path.GetDirectoryName(tempPath); |
801 |
if (!Directory.Exists(tempFolder)) |
802 |
Directory.CreateDirectory(tempFolder); |
803 |
|
804 |
//Download the object to the temporary location |
805 |
await client.GetObject(cloudFile.Account, cloudFile.Container, relativeUrl.ToString(), tempPath); |
806 |
|
807 |
//Create the local folder if it doesn't exist (necessary for shared objects) |
808 |
var localFolder = Path.GetDirectoryName(localPath); |
809 |
if (!Directory.Exists(localFolder)) |
810 |
Directory.CreateDirectory(localFolder); |
811 |
//And move it to its actual location once downloading is finished |
812 |
if (File.Exists(localPath)) |
813 |
File.Replace(tempPath,localPath,null,true); |
814 |
else |
815 |
File.Move(tempPath,localPath); |
816 |
//Notify listeners that a local file has changed |
817 |
StatusNotification.NotifyChangedFile(localPath); |
818 |
|
819 |
|
820 |
} |
821 |
|
822 |
//Download a file asynchronously using blocks |
823 |
public async Task DownloadWithBlocks(AccountInfo accountInfo, CloudFilesClient client, ObjectInfo cloudFile, Uri relativeUrl, string filePath, TreeHash serverHash) |
824 |
{ |
825 |
if (client == null) |
826 |
throw new ArgumentNullException("client"); |
827 |
if (cloudFile == null) |
828 |
throw new ArgumentNullException("cloudFile"); |
829 |
if (relativeUrl == null) |
830 |
throw new ArgumentNullException("relativeUrl"); |
831 |
if (String.IsNullOrWhiteSpace(filePath)) |
832 |
throw new ArgumentNullException("filePath"); |
833 |
if (!Path.IsPathRooted(filePath)) |
834 |
throw new ArgumentException("The filePath must be rooted", "filePath"); |
835 |
if (serverHash == null) |
836 |
throw new ArgumentNullException("serverHash"); |
837 |
Contract.EndContractBlock(); |
838 |
|
839 |
var fileAgent = GetFileAgent(accountInfo); |
840 |
var localPath = Interfaces.FileInfoExtensions.GetProperFilePathCapitalization(filePath); |
841 |
|
842 |
//Calculate the relative file path for the new file |
843 |
var relativePath = relativeUrl.RelativeUriToFilePath(); |
844 |
var blockUpdater = new BlockUpdater(fileAgent.CachePath, localPath, relativePath, serverHash); |
845 |
|
846 |
|
847 |
|
848 |
//Calculate the file's treehash |
849 |
var treeHash = await Signature.CalculateTreeHashAsync(localPath, serverHash.BlockSize, serverHash.BlockHash); |
850 |
|
851 |
//And compare it with the server's hash |
852 |
var upHashes = serverHash.GetHashesAsStrings(); |
853 |
var localHashes = treeHash.HashDictionary; |
854 |
for (int i = 0; i < upHashes.Length; i++) |
855 |
{ |
856 |
//For every non-matching hash |
857 |
var upHash = upHashes[i]; |
858 |
if (!localHashes.ContainsKey(upHash)) |
859 |
{ |
860 |
if (blockUpdater.UseOrphan(i, upHash)) |
861 |
{ |
862 |
Log.InfoFormat("[BLOCK GET] ORPHAN FOUND for {0} of {1} for {2}", i, upHashes.Length, localPath); |
863 |
continue; |
864 |
} |
865 |
Log.InfoFormat("[BLOCK GET] START {0} of {1} for {2}", i, upHashes.Length, localPath); |
866 |
var start = i*serverHash.BlockSize; |
867 |
//To download the last block just pass a null for the end of the range |
868 |
long? end = null; |
869 |
if (i < upHashes.Length - 1 ) |
870 |
end= ((i + 1)*serverHash.BlockSize) ; |
871 |
|
872 |
//Download the missing block |
873 |
var block = await client.GetBlock(cloudFile.Account, cloudFile.Container, relativeUrl, start, end); |
874 |
|
875 |
//and store it |
876 |
blockUpdater.StoreBlock(i, block); |
877 |
|
878 |
|
879 |
Log.InfoFormat("[BLOCK GET] FINISH {0} of {1} for {2}", i, upHashes.Length, localPath); |
880 |
} |
881 |
} |
882 |
|
883 |
//Want to avoid notifications if no changes were made |
884 |
var hasChanges = blockUpdater.HasBlocks; |
885 |
blockUpdater.Commit(); |
886 |
|
887 |
if (hasChanges) |
888 |
//Notify listeners that a local file has changed |
889 |
StatusNotification.NotifyChangedFile(localPath); |
890 |
|
891 |
Log.InfoFormat("[BLOCK GET] COMPLETE {0}", localPath); |
892 |
} |
893 |
|
894 |
|
895 |
private async Task UploadCloudFile(CloudAction action) |
896 |
{ |
897 |
if (action == null) |
898 |
throw new ArgumentNullException("action"); |
899 |
Contract.EndContractBlock(); |
900 |
|
901 |
try |
902 |
{ |
903 |
var accountInfo = action.AccountInfo; |
904 |
|
905 |
var fileInfo = action.LocalFile; |
906 |
|
907 |
if (fileInfo.Extension.Equals("ignore", StringComparison.InvariantCultureIgnoreCase)) |
908 |
return; |
909 |
|
910 |
var relativePath = fileInfo.AsRelativeTo(accountInfo.AccountPath); |
911 |
if (relativePath.StartsWith(FolderConstants.OthersFolder)) |
912 |
{ |
913 |
var parts = relativePath.Split('\\'); |
914 |
var accountName = parts[1]; |
915 |
var oldName = accountInfo.UserName; |
916 |
var absoluteUri = accountInfo.StorageUri.AbsoluteUri; |
917 |
var nameIndex = absoluteUri.IndexOf(oldName); |
918 |
var root = absoluteUri.Substring(0, nameIndex); |
919 |
|
920 |
accountInfo = new AccountInfo |
921 |
{ |
922 |
UserName = accountName, |
923 |
AccountPath = Path.Combine(accountInfo.AccountPath, parts[0], parts[1]), |
924 |
StorageUri = new Uri(root + accountName), |
925 |
BlockHash = accountInfo.BlockHash, |
926 |
BlockSize = accountInfo.BlockSize, |
927 |
Token = accountInfo.Token |
928 |
}; |
929 |
} |
930 |
|
931 |
|
932 |
var fullFileName = fileInfo.GetProperCapitalization(); |
933 |
using (var gate = NetworkGate.Acquire(fullFileName, NetworkOperation.Uploading)) |
934 |
{ |
935 |
//Abort if the file is already being uploaded or downloaded |
936 |
if (gate.Failed) |
937 |
return; |
938 |
|
939 |
var cloudFile = action.CloudFile; |
940 |
var account = cloudFile.Account ?? accountInfo.UserName; |
941 |
|
942 |
var client = new CloudFilesClient(accountInfo); |
943 |
//Even if GetObjectInfo times out, we can proceed with the upload |
944 |
var info = client.GetObjectInfo(account, cloudFile.Container, cloudFile.Name); |
945 |
|
946 |
//If this is a read-only file, do not upload changes |
947 |
if (info.AllowedTo == "read") |
948 |
return; |
949 |
|
950 |
//TODO: Check how a directory hash is calculated -> All dirs seem to have the same hash |
951 |
if (fileInfo is DirectoryInfo) |
952 |
{ |
953 |
//If the directory doesn't exist the Hash property will be empty |
954 |
if (String.IsNullOrWhiteSpace(info.Hash)) |
955 |
//Go on and create the directory |
956 |
await client.PutObject(account, cloudFile.Container, cloudFile.Name, fullFileName, String.Empty, "application/directory"); |
957 |
} |
958 |
else |
959 |
{ |
960 |
|
961 |
var cloudHash = info.Hash.ToLower(); |
962 |
|
963 |
var hash = action.LocalHash.Value; |
964 |
var topHash = action.TopHash.Value; |
965 |
|
966 |
//If the file hashes match, abort the upload |
967 |
if (hash == cloudHash || topHash == cloudHash) |
968 |
{ |
969 |
//but store any metadata changes |
970 |
StatusKeeper.StoreInfo(fullFileName, info); |
971 |
Log.InfoFormat("Skip upload of {0}, hashes match", fullFileName); |
972 |
return; |
973 |
} |
974 |
|
975 |
|
976 |
//Mark the file as modified while we upload it |
977 |
StatusKeeper.SetFileOverlayStatus(fullFileName, FileOverlayStatus.Modified); |
978 |
//And then upload it |
979 |
|
980 |
//Upload even small files using the Hashmap. The server may already contain |
981 |
//the relevant block |
982 |
|
983 |
//First, calculate the tree hash |
984 |
var treeHash = await Signature.CalculateTreeHashAsync(fullFileName, accountInfo.BlockSize, |
985 |
accountInfo.BlockHash); |
986 |
|
987 |
await UploadWithHashMap(accountInfo, cloudFile, fileInfo as FileInfo, cloudFile.Name, treeHash); |
988 |
} |
989 |
//If everything succeeds, change the file and overlay status to normal |
990 |
StatusKeeper.SetFileState(fullFileName, FileStatus.Unchanged, FileOverlayStatus.Normal); |
991 |
} |
992 |
//Notify the Shell to update the overlays |
993 |
NativeMethods.RaiseChangeNotification(fullFileName); |
994 |
StatusNotification.NotifyChangedFile(fullFileName); |
995 |
} |
996 |
catch (AggregateException ex) |
997 |
{ |
998 |
var exc = ex.InnerException as WebException; |
999 |
if (exc == null) |
1000 |
throw ex.InnerException; |
1001 |
if (HandleUploadWebException(action, exc)) |
1002 |
return; |
1003 |
throw; |
1004 |
} |
1005 |
catch (WebException ex) |
1006 |
{ |
1007 |
if (HandleUploadWebException(action, ex)) |
1008 |
return; |
1009 |
throw; |
1010 |
} |
1011 |
catch (Exception ex) |
1012 |
{ |
1013 |
Log.Error("Unexpected error while uploading file", ex); |
1014 |
throw; |
1015 |
} |
1016 |
|
1017 |
} |
1018 |
|
1019 |
private bool IsDeletedFile(CloudAction action) |
1020 |
{ |
1021 |
var key = GetFileKey(action.CloudFile); |
1022 |
DateTime entryDate; |
1023 |
if (_deletedFiles.TryGetValue(key, out entryDate)) |
1024 |
{ |
1025 |
//If the delete entry was created after this action, abort the action |
1026 |
if (entryDate > action.Created) |
1027 |
return true; |
1028 |
//Otherwise, remove the stale entry |
1029 |
_deletedFiles.TryRemove(key, out entryDate); |
1030 |
} |
1031 |
return false; |
1032 |
} |
1033 |
|
1034 |
private bool HandleUploadWebException(CloudAction action, WebException exc) |
1035 |
{ |
1036 |
var response = exc.Response as HttpWebResponse; |
1037 |
if (response == null) |
1038 |
throw exc; |
1039 |
if (response.StatusCode == HttpStatusCode.Unauthorized) |
1040 |
{ |
1041 |
Log.Error("Not allowed to upload file", exc); |
1042 |
var message = String.Format("Not allowed to uplad file {0}", action.LocalFile.FullName); |
1043 |
StatusKeeper.SetFileState(action.LocalFile.FullName, FileStatus.Unchanged, FileOverlayStatus.Normal); |
1044 |
StatusNotification.NotifyChange(message, TraceLevel.Warning); |
1045 |
return true; |
1046 |
} |
1047 |
return false; |
1048 |
} |
1049 |
|
1050 |
public async Task UploadWithHashMap(AccountInfo accountInfo,ObjectInfo cloudFile,FileInfo fileInfo,string url,TreeHash treeHash) |
1051 |
{ |
1052 |
if (accountInfo == null) |
1053 |
throw new ArgumentNullException("accountInfo"); |
1054 |
if (cloudFile==null) |
1055 |
throw new ArgumentNullException("cloudFile"); |
1056 |
if (fileInfo == null) |
1057 |
throw new ArgumentNullException("fileInfo"); |
1058 |
if (String.IsNullOrWhiteSpace(url)) |
1059 |
throw new ArgumentNullException(url); |
1060 |
if (treeHash==null) |
1061 |
throw new ArgumentNullException("treeHash"); |
1062 |
if (String.IsNullOrWhiteSpace(cloudFile.Container) ) |
1063 |
throw new ArgumentException("Invalid container","cloudFile"); |
1064 |
Contract.EndContractBlock(); |
1065 |
|
1066 |
var fullFileName = fileInfo.GetProperCapitalization(); |
1067 |
|
1068 |
var account = cloudFile.Account ?? accountInfo.UserName; |
1069 |
var container = cloudFile.Container ; |
1070 |
|
1071 |
var client = new CloudFilesClient(accountInfo); |
1072 |
//Send the hashmap to the server |
1073 |
var missingHashes = await client.PutHashMap(account, container, url, treeHash); |
1074 |
//If the server returns no missing hashes, we are done |
1075 |
while (missingHashes.Count > 0) |
1076 |
{ |
1077 |
|
1078 |
var buffer = new byte[accountInfo.BlockSize]; |
1079 |
foreach (var missingHash in missingHashes) |
1080 |
{ |
1081 |
//Find the proper block |
1082 |
var blockIndex = treeHash.HashDictionary[missingHash]; |
1083 |
var offset = blockIndex*accountInfo.BlockSize; |
1084 |
|
1085 |
var read = fileInfo.Read(buffer, offset, accountInfo.BlockSize); |
1086 |
|
1087 |
try |
1088 |
{ |
1089 |
//And upload the block |
1090 |
await client.PostBlock(account, container, buffer, 0, read); |
1091 |
Log.InfoFormat("[BLOCK] Block {0} of {1} uploaded", blockIndex, fullFileName); |
1092 |
} |
1093 |
catch (Exception exc) |
1094 |
{ |
1095 |
Log.ErrorFormat("[ERROR] uploading block {0} of {1}\n{2}", blockIndex, fullFileName, exc); |
1096 |
} |
1097 |
|
1098 |
} |
1099 |
|
1100 |
//Repeat until there are no more missing hashes |
1101 |
missingHashes = await client.PutHashMap(account, container, url, treeHash); |
1102 |
} |
1103 |
} |
1104 |
|
1105 |
|
1106 |
public void AddAccount(AccountInfo accountInfo) |
1107 |
{ |
1108 |
if (!_accounts.Contains(accountInfo)) |
1109 |
_accounts.Add(accountInfo); |
1110 |
} |
1111 |
} |
1112 |
|
1113 |
|
1114 |
|
1115 |
|
1116 |
} |