-using System;
+#region
+/* -----------------------------------------------------------------------
+ * <copyright file="NetworkAgent.cs" company="GRNet">
+ *
+ * Copyright 2011-2012 GRNET S.A. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ *
+ * THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
+ * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * The views and conclusions contained in the software and
+ * documentation are those of the authors and should not be
+ * interpreted as representing official policies, either expressed
+ * or implied, of GRNET S.A.
+ * </copyright>
+ * -----------------------------------------------------------------------
+ */
+#endregion
+
+using System;
using System.Collections.Generic;
using System.ComponentModel.Composition;
using System.Diagnostics;
using System.Diagnostics.Contracts;
using System.IO;
using System.Linq;
-using System.Text;
+using System.Net;
+using System.Reflection;
using System.Threading;
using System.Threading.Tasks;
+using Castle.ActiveRecord;
using Pithos.Interfaces;
using Pithos.Network;
+using log4net;
namespace Pithos.Core.Agents
{
[Export]
public class NetworkAgent
{
+ private static readonly ILog Log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
+
private Agent<CloudAction> _agent;
- [Import]
+ [System.ComponentModel.Composition.Import]
+ private DeleteAgent DeleteAgent { get; set; }
+
+ [System.ComponentModel.Composition.Import]
public IStatusKeeper StatusKeeper { get; set; }
-
- public IStatusNotification StatusNotification { get; set; }
- [Import]
- public ICloudClient CloudClient { get; set; }
- [Import]
- public FileAgent FileAgent {get;set;}
+ private IStatusNotification _statusNotification;
+ public IStatusNotification StatusNotification
+ {
+ get { return _statusNotification; }
+ set
+ {
+ _statusNotification = value;
+ DeleteAgent.StatusNotification = value;
+ Uploader.StatusNotification = value;
+ Downloader.StatusNotification = value;
+ }
+ }
- /*
- [Import]
- public IPithosWorkflow Workflow { get; set; }
-*/
+ [System.ComponentModel.Composition.Import]
+ public IPithosSettings Settings { get; set; }
- public string PithosContainer { get; set; }
- public string TrashContainer { get; private set; }
+ private Uploader _uploader;
- public int BlockSize { get; set; }
- public string BlockHash { get; set; }
+ [System.ComponentModel.Composition.Import]
+ public Uploader Uploader
+ {
+ get { return _uploader; }
+ set
+ {
+ _uploader = value;
+ _uploader.UnpauseEvent = _unPauseEvent;
+ }
+ }
+ private Downloader _downloader;
- public void Start(string pithosContainer, string trashContainer, int blockSize, string blockHash)
+ [System.ComponentModel.Composition.Import]
+ public Downloader Downloader
{
- if (String.IsNullOrWhiteSpace(pithosContainer))
- throw new ArgumentNullException("pithosContainer");
- if (String.IsNullOrWhiteSpace(trashContainer))
- throw new ArgumentNullException("trashContainer");
- Contract.EndContractBlock();
+ get { return _downloader; }
+ set
+ {
+ _downloader = value;
+ _downloader.UnpauseEvent = _unPauseEvent;
+ }
+ }
+
+ [System.ComponentModel.Composition.Import]
+ public Selectives Selectives { get; set; }
+
+ //The Proceed signals the poll agent that it can proceed with polling.
+ //Essentially it stops the poll agent to give priority to the network agent
+ //Initially the event is signalled because we don't need to pause
+ private readonly AsyncManualResetEvent _proceedEvent = new AsyncManualResetEvent(true);
+ private Agents.Selectives _selectives;
+ private bool _pause;
+
+ public AsyncManualResetEvent ProceedEvent
+ {
+ get { return _proceedEvent; }
+ }
- PithosContainer = pithosContainer;
- TrashContainer = trashContainer;
- BlockSize = blockSize;
- BlockHash = blockHash;
+ private readonly AsyncManualResetEvent _unPauseEvent = new AsyncManualResetEvent(true);
+ private CancellationTokenSource _currentOperationCancellation=new CancellationTokenSource();
+
+ public void CancelCurrentOperation()
+ {
+ //What does it mean to cancel the current upload/download?
+ //Obviously, the current operation will be cancelled by throwing
+ //a cancellation exception.
+ //
+ //The default behavior is to retry any operations that throw.
+ //Obviously this is not what we want in this situation.
+ //The cancelled operation should NOT bea retried.
+ //
+ //This can be done by catching the cancellation exception
+ //and avoiding the retry.
+ //
+
+ //Have to reset the cancellation source - it is not possible to reset the source
+ //Have to prevent a case where an operation requests a token from the old source
+ var oldSource = Interlocked.Exchange(ref _currentOperationCancellation, new CancellationTokenSource());
+ oldSource.Cancel();
+
+ }
+
+ public void Start()
+ {
+ if (_agent != null)
+ return;
+
+ if (Log.IsDebugEnabled)
+ Log.Debug("Starting Network Agent");
_agent = Agent<CloudAction>.Start(inbox =>
{
Action loop = null;
loop = () =>
{
+ DeleteAgent.ProceedEvent.Wait();
+ _unPauseEvent.Wait();
var message = inbox.Receive();
-
-/*
- var process=Process(message);
+ var process=message.Then(Process,inbox.CancellationToken);
inbox.LoopAsync(process, loop);
-*/
-
-/*
- process1.ContinueWith(t =>
- {
- inbox.DoAsync(loop);
- if (t.IsFaulted)
- {
- var ex = t.Exception.InnerException;
- if (ex is OperationCanceledException)
- inbox.Stop();
- }
- });
-*/
- //inbox.DoAsync(loop);
-
-
- var process = message.ContinueWith(t =>
- {
- var action = t.Result;
-
- Process(action);
- inbox.DoAsync(loop);
- });
-
- process.ContinueWith(t =>
- {
- inbox.DoAsync(loop);
- if (t.IsFaulted)
- {
- var ex = t.Exception.InnerException;
- if (ex is OperationCanceledException)
- inbox.Stop();
- }
- });
-
-
};
loop();
});
- }
+ }
- public void Post(CloudAction cloudAction)
+ private async Task Process(CloudAction action)
{
- if (cloudAction == null)
- throw new ArgumentNullException("cloudAction");
+ if (action == null)
+ throw new ArgumentNullException("action");
+ if (action.AccountInfo==null)
+ throw new ArgumentException("The action.AccountInfo is empty","action");
Contract.EndContractBlock();
-
- //If the action targets a local file, add a treehash calculation
- if (cloudAction.LocalFile != null)
- {
- cloudAction.TopHash = new Lazy<string>(() => Signature.CalculateTreeHashAsync(cloudAction.LocalFile,
- BlockSize, BlockHash).Result
- .TopHash.ToHashString());
- }
- _agent.Post(cloudAction);
- }
- class ObjectInfoByNameComparer:IEqualityComparer<ObjectInfo>
- {
- public bool Equals(ObjectInfo x, ObjectInfo y)
- {
- return x.Name.Equals(y.Name,StringComparison.InvariantCultureIgnoreCase);
- }
- public int GetHashCode(ObjectInfo obj)
- {
- return obj.Name.ToLower().GetHashCode();
- }
- }
-
- public Task ProcessRemoteFiles(string accountPath,DateTime? since=null)
- {
- Trace.CorrelationManager.StartLogicalOperation();
- Trace.TraceInformation("[LISTENER] Scheduled");
- var listObjects = Task.Factory.StartNewDelayed(10000).ContinueWith(t =>
- CloudClient.ListObjects(PithosContainer,since));
+ using (ThreadContext.Stacks["Operation"].Push(action.ToString()))
+ {
- DateTime nextSince = DateTime.Now.AddSeconds(-1);
+ var cloudFile = action.CloudFile;
+ var downloadPath = action.GetDownloadPath();
- var enqueueFiles = listObjects.ContinueWith(task =>
- {
- if (task.IsFaulted)
- {
- //ListObjects failed at this point, need to reschedule
- Trace.TraceError("[FAIL] ListObjects in ProcessRemoteFiles with {0}", task.Exception);
- ProcessRemoteFiles(accountPath, since);
- return;
- }
- Trace.CorrelationManager.StartLogicalOperation("Listener");
- Trace.TraceInformation("[LISTENER] Start Processing");
-
- var remoteObjects = task.Result;
-
- var remote=from info in remoteObjects
- let name=info.Name
- where !name.EndsWith(".ignore",StringComparison.InvariantCultureIgnoreCase) &&
- !name.StartsWith("fragments/",StringComparison.InvariantCultureIgnoreCase)
- select info;
-
- var commonObjects = new List<Tuple<ObjectInfo, FileInfo,FileState>>();
- var remoteOnly = new List<ObjectInfo>();
-
- //In order to avoid multiple iterations over the files, we iterate only once
- //over the remote files
- foreach (var objectInfo in remote)
+ try
{
- var relativePath= objectInfo.Name.RelativeUrlToFilePath();// fileInfo.AsRelativeUrlTo(FileAgent.RootPath);
- //and remove any matching objects from the list, adding them to the commonObjects list
- if (FileAgent.Exists(relativePath))
+ StatusNotification.SetPithosStatus(PithosStatus.LocalSyncing,"Processing");
+ _proceedEvent.Reset();
+
+ var accountInfo = action.AccountInfo;
+
+ if (action.Action == CloudActionType.DeleteCloud)
+ {
+ //Redirect deletes to the delete agent
+ DeleteAgent.Post((CloudDeleteAction)action);
+ }
+ if (DeleteAgent.IsDeletedFile(action))
{
- var localFile = FileAgent.GetFileInfo(relativePath);
- var state=FileState.FindByFilePath(localFile.FullName);
- commonObjects.Add(Tuple.Create(objectInfo, localFile,state));
+ //Clear the status of already deleted files to avoid reprocessing
+ if (action.LocalFile != null)
+ StatusKeeper.ClearFileStatus(action.LocalFile.FullName);
}
else
- //If there is no match we add them to the localFiles list
- remoteOnly.Add(objectInfo);
+ {
+ switch (action.Action)
+ {
+ case CloudActionType.UploadUnconditional:
+ //Abort if the file was deleted before we reached this point
+ var uploadAction = (CloudUploadAction) action;
+ ProcessChildUploads(uploadAction);
+ await Uploader.UploadCloudFile(uploadAction ,CurrentOperationCancelToken);
+ break;
+ case CloudActionType.DownloadUnconditional:
+ await Downloader.DownloadCloudFile(accountInfo, cloudFile, downloadPath, CurrentOperationCancelToken);
+ break;
+ case CloudActionType.RenameCloud:
+ var moveAction = (CloudMoveAction)action;
+ RenameCloudFile(accountInfo, moveAction);
+ break;
+ case CloudActionType.RenameLocal:
+ RenameLocalFile(accountInfo, action);
+ break;
+ case CloudActionType.MustSynch:
+ if (!File.Exists(downloadPath) && !Directory.Exists(downloadPath))
+ {
+ await Downloader.DownloadCloudFile(accountInfo, cloudFile, downloadPath, CurrentOperationCancelToken);
+ }
+ else
+ {
+ await SyncFiles(accountInfo, action);
+ }
+ break;
+ }
+ }
+ Log.InfoFormat("End Processing {0}:{1}->{2}", action.Action, action.LocalFile,
+ action.CloudFile.Name);
}
-
- //At the end of the iteration, the *remote* list will contain the files that exist
- //only on the server
-
- //Remote files should be downloaded
- var actionsForRemote = from upFile in remoteOnly
- select new CloudAction(CloudActionType.DownloadUnconditional,upFile);
-
- //Common files should be checked on a per-case basis to detect differences, which is newer
- var actionsForCommon = from pair in commonObjects
- let objectInfo = pair.Item1
- let localFile = pair.Item2
- let state=pair.Item3
- select new CloudAction(CloudActionType.MustSynch,
- localFile, objectInfo,state);
-
-
- //Collect all the actions
- var allActions = actionsForRemote.Union(actionsForCommon);
-
- //And remove those that are already being processed by the agent
- var distinctActions =allActions
- .Except(_agent.GetEnumerable(), new PithosMonitor.LocalFileComparer())
- .ToList();
-
- //Queue all the actions
- foreach (var message in distinctActions)
+/*
+ catch (WebException exc)
+ {
+ Log.ErrorFormat("[WEB ERROR] {0} : {1} -> {2} due to exception\r\n{3}", action.Action, action.LocalFile, action.CloudFile, exc);
+
+
+ //Actions that resulted in server errors should be retried
+ var response = exc.Response as HttpWebResponse;
+ if (response != null && response.StatusCode >= HttpStatusCode.InternalServerError)
+ {
+ _agent.Post(action);
+ Log.WarnFormat("[REQUEUE] {0} : {1} -> {2}", action.Action, action.LocalFile, action.CloudFile);
+ }
+ }
+*/
+ catch (OperationCanceledException ex)
+ {
+ Log.WarnFormat("Cancelling [{0}]",ex);
+ }
+ catch (DirectoryNotFoundException)
{
- Post(message);
+ Log.ErrorFormat("{0} : {1} -> {2} failed because the directory was not found.\n Rescheduling a delete",
+ action.Action, action.LocalFile, action.CloudFile);
+ //Post a delete action for the missing file
+ Post(new CloudDeleteAction(action));
}
-
-
- if(remoteOnly.Count>0)
- StatusNotification.NotifyChange(String.Format("Processing {0} new files", remoteOnly.Count));
-
- Trace.TraceInformation("[LISTENER] End Processing");
- Trace.CorrelationManager.StopLogicalOperation();
-
- });
-
- var loop = enqueueFiles.ContinueWith(t =>
- {
- if (t.IsFaulted)
+ catch (FileNotFoundException)
{
- Trace.TraceError("[LISTENER] Exception: {0}", t.Exception);
+ Log.ErrorFormat("{0} : {1} -> {2} failed because the file was not found.\n Rescheduling a delete",
+ action.Action, action.LocalFile, action.CloudFile);
+ //Post a delete action for the missing file
+ Post(new CloudDeleteAction(action));
}
- else
+ catch (Exception exc)
{
- Trace.TraceInformation("[LISTENER] Finished");
+ Log.ErrorFormat("[REQUEUE] {0} : {1} -> {2} due to exception\r\n{3}",
+ action.Action, action.LocalFile, action.CloudFile, exc);
+
+ _agent.Post(action);
}
- ProcessRemoteFiles(accountPath, nextSince);
-
- });
- return loop;
+ finally
+ {
+ if (_agent.IsEmpty)
+ _proceedEvent.Set();
+ UpdateStatus(PithosStatus.LocalComplete);
+ }
+ }
}
-
- private Task Process(Task<CloudAction> action)
+ private void ProcessChildUploads(CloudUploadAction uploadAction)
{
- return action.ContinueWith(t=> Process(t.Result));
- }
+ if (!uploadAction.IsCreation || !(uploadAction.LocalFile is DirectoryInfo))
+ return;
+ var dirInfo = uploadAction.LocalFile as DirectoryInfo;
- private void Process(CloudAction action)
- {
- if (action==null)
- throw new ArgumentNullException("action");
- Contract.EndContractBlock();
-
- Trace.TraceInformation("[ACTION] Start Processing {0}:{1}->{2}", action.Action, action.LocalFile, action.CloudFile.Name);
- var localFile = action.LocalFile;
- var cloudFile = action.CloudFile;
- var downloadPath = (cloudFile == null) ? String.Empty
- : Path.Combine(FileAgent.RootPath, cloudFile.Name.RelativeUrlToFilePath());
-
- try
+ var account = uploadAction.AccountInfo;
+ var actions = from file in dirInfo.EnumerateFiles("*", SearchOption.AllDirectories)
+ select
+ new CloudUploadAction(account, file, null, account.BlockSize, account.BlockHash,
+ uploadAction, true);
+ foreach (var action in actions)
{
- switch (action.Action)
- {
- case CloudActionType.UploadUnconditional:
- UploadCloudFile(localFile, action.LocalHash.Value,action.TopHash.Value);
- break;
- case CloudActionType.DownloadUnconditional:
- DownloadCloudFile(PithosContainer, new Uri(cloudFile.Name,UriKind.Relative), downloadPath);
- break;
- case CloudActionType.DeleteCloud:
- DeleteCloudFile(cloudFile.Name);
- break;
- case CloudActionType.RenameCloud:
- RenameCloudFile(action.OldFileName, action.NewPath, action.NewFileName);
- break;
- case CloudActionType.MustSynch:
- if (File.Exists(downloadPath))
- {
- var cloudHash = cloudFile.Hash;
- var localHash = action.LocalHash.Value;
- var topHash = action.TopHash.Value;
- //Not enough to compare only the local hashes, also have to compare the tophashes
- if (!cloudHash.Equals(localHash, StringComparison.InvariantCultureIgnoreCase) &&
- !cloudHash.Equals(topHash, StringComparison.InvariantCultureIgnoreCase))
- {
- var lastLocalTime = localFile.LastWriteTime;
- var lastUpTime = cloudFile.Last_Modified;
- if (lastUpTime <= lastLocalTime)
- {
- //Local change while the app was down or Files in conflict
- //Maybe need to store version as well, to check who has the latest version
-
- //StatusKeeper.SetFileOverlayStatus(downloadPath, FileOverlayStatus.Conflict);
- UploadCloudFile(localFile, action.LocalHash.Value,action.TopHash.Value);
- }
- else
- {
- var status = StatusKeeper.GetFileStatus(downloadPath);
- switch (status)
- {
- case FileStatus.Unchanged:
- //It he cloud file has a later date, it was modified by another user or computer.
- //If the local file's status is Unchanged, we should go on and download the cloud file
- DownloadCloudFile(PithosContainer, new Uri(action.CloudFile.Name,UriKind.Relative), downloadPath);
- break;
- case FileStatus.Modified:
- //If the local file is Modified, we may have a conflict. In this case we should mark the file as Conflict
- //We can't ensure that a file modified online since the last time will appear as Modified, unless we
- //index all files before we start listening.
- StatusKeeper.SetFileOverlayStatus(downloadPath, FileOverlayStatus.Conflict);
- break;
- case FileStatus.Created:
- //If the local file is Created, it means that the local and cloud files aren't related yet have the same name
- //In this case we must mark the file as in conflict
- //Other cases should never occur. Mark them as Conflict as well but log a warning
- StatusKeeper.SetFileOverlayStatus(downloadPath,FileOverlayStatus.Conflict);
- break;
- default:
- //If the local file is Created, it means that the local and cloud files aren't related yet have the same name
- //In this case we must mark the file as in conflict
- //Other cases should never occur. Mark them as Conflict as well but log a warning
- StatusKeeper.SetFileOverlayStatus(downloadPath,FileOverlayStatus.Conflict);
- Trace.TraceWarning("Unexcepted status {0} for file {1}->{2}",status,downloadPath,action.CloudFile.Name);
- break;
- }
- }
- }
- }
- else
- DownloadCloudFile(PithosContainer, new Uri(action.CloudFile.Name,UriKind.Relative), downloadPath);
- break;
- }
- Trace.TraceInformation("[ACTION] End Processing {0}:{1}->{2}", action.Action, action.LocalFile, action.CloudFile.Name);
- }
- catch (OperationCanceledException)
- {
- throw;
+ var state=StatusKeeper.GetStateByFilePath(action.LocalFile.FullName);
+ if (state!=null)
+ state.Delete();
+ //StatusKeeper.SetFileState(action.LocalFile.FullName,FileStatus.Created,FileOverlayStatus.Normal,String.Empty);
+ state=FileState.CreateFor(action.LocalFile);
+ //StatusKeeper.SetFileStatus();
+ state.FileStatus = FileStatus.Created;
+ state.OverlayStatus=FileOverlayStatus.Normal;
+ state.Create();
+ action.FileState = state;
+ Post(action);
}
- catch (Exception exc)
- {
- Trace.TraceError("[REQUEUE] {0} : {1} -> {2} due to exception\r\n{3}",
- action.Action, action.LocalFile, action.CloudFile, exc);
-
- _agent.Post(action);
- }
-
}
-
-
- private void RenameCloudFile(string oldFileName, string newPath, string newFileName)
+ private CancellationToken CurrentOperationCancelToken
{
- if (String.IsNullOrWhiteSpace(oldFileName))
- throw new ArgumentNullException("oldFileName");
- if (String.IsNullOrWhiteSpace(oldFileName))
- throw new ArgumentNullException("newPath");
- if (String.IsNullOrWhiteSpace(oldFileName))
- throw new ArgumentNullException("newFileName");
- Contract.EndContractBlock();
- //The local file is already renamed
- this.StatusKeeper.SetFileOverlayStatus(newPath, FileOverlayStatus.Modified);
-
- CloudClient.MoveObject(PithosContainer, oldFileName, PithosContainer, newFileName);
-
- this.StatusKeeper.SetFileStatus(newPath, FileStatus.Unchanged);
- this.StatusKeeper.SetFileOverlayStatus(newPath, FileOverlayStatus.Normal);
- NativeMethods.RaiseChangeNotification(newPath);
+ get { return _currentOperationCancellation.Token; }
}
- private void DeleteCloudFile(string fileName)
- {
- if (String.IsNullOrWhiteSpace(fileName))
- throw new ArgumentNullException("fileName");
- if (Path.IsPathRooted(fileName))
- throw new ArgumentException("The fileName should not be rooted","fileName");
- Contract.EndContractBlock();
-
- this.StatusKeeper.SetFileOverlayStatus(fileName, FileOverlayStatus.Modified);
- CloudClient.MoveObject(PithosContainer, fileName, TrashContainer, fileName);
-
- this.StatusKeeper.ClearFileStatus(fileName);
- this.StatusKeeper.RemoveFileOverlayStatus(fileName);
+ private void UpdateStatus(PithosStatus status)
+ {
+ StatusNotification.SetPithosStatus(status);
+ //StatusNotification.Notify(new Notification());
}
- //Download a file.
- private void DownloadCloudFile(string container, Uri relativeUrl, string localPath)
+ private void RenameLocalFile(AccountInfo accountInfo, CloudAction action)
{
- if (String.IsNullOrWhiteSpace(container))
- throw new ArgumentNullException("container");
- if (relativeUrl==null)
- throw new ArgumentNullException("relativeUrl");
- if (String.IsNullOrWhiteSpace(localPath))
- throw new ArgumentNullException("localPath");
- if (!Path.IsPathRooted(localPath))
- throw new ArgumentException("The localPath must be rooted", "localPath");
+ if (accountInfo == null)
+ throw new ArgumentNullException("accountInfo");
+ if (action == null)
+ throw new ArgumentNullException("action");
+ if (action.LocalFile == null)
+ throw new ArgumentException("The action's local file is not specified", "action");
+ if (!Path.IsPathRooted(action.LocalFile.FullName))
+ throw new ArgumentException("The action's local file path must be absolute", "action");
+ if (action.CloudFile == null)
+ throw new ArgumentException("The action's cloud file is not specified", "action");
Contract.EndContractBlock();
+ using (ThreadContext.Stacks["Operation"].Push("RenameLocalFile"))
+ {
- var url = relativeUrl.ToString();
- if (url.EndsWith(".ignore",StringComparison.InvariantCultureIgnoreCase))
- return;
+ //We assume that the local file already exists, otherwise the poll agent
+ //would have issued a download request
- //Are we already downloading or uploading the file?
- using (var gate=NetworkGate.Acquire(localPath, NetworkOperation.Downloading))
- {
- if (gate.Failed)
- return;
- //The file's hashmap will be stored in the same location with the extension .hashmap
- //var hashPath = Path.Combine(FileAgent.FragmentsPath, relativePath + ".hashmap");
-
- //Retrieve the hashmap from the server
- var getHashMap = CloudClient.GetHashMap(container,url);
- var downloadTask= getHashMap.ContinueWith(t =>
- {
- var serverHash=t.Result;
- //If it's a small file
- return serverHash.Hashes.Count == 1
- //Download it in one go
- ? DownloadEntireFile(container, relativeUrl, localPath)
- //Otherwise download it block by block
- : DownloadWithBlocks(container, relativeUrl, localPath, serverHash);
- });
-
-
-
- //Retrieve the object's metadata
- var getInfo = downloadTask.ContinueWith(t =>
- CloudClient.GetObjectInfo(container, url));
- //And store it
- var storeInfo = getInfo.ContinueWith(t =>
- StatusKeeper.StoreInfo(localPath, t.Result));
-
- storeInfo.Wait();
- StatusNotification.NotifyChangedFile(localPath);
+ var currentInfo = action.CloudFile;
+ var previousInfo = action.CloudFile.Previous;
+ var fileAgent = FileAgent.GetFileAgent(accountInfo);
+
+ var previousRelativepath = previousInfo.RelativeUrlToFilePath(accountInfo.UserName);
+ var previousFile = fileAgent.GetFileSystemInfo(previousRelativepath);
+ //In every case we need to move the local file first
+ MoveLocalFile(accountInfo, previousFile, fileAgent, currentInfo);
}
}
- //Download a small file with a single GET operation
- private Task DownloadEntireFile(string container, Uri relativeUrl, string localPath)
+ private void MoveLocalFile(AccountInfo accountInfo, FileSystemInfo previousFile, FileAgent fileAgent,
+ ObjectInfo currentInfo)
{
- if (String.IsNullOrWhiteSpace(container))
- throw new ArgumentNullException("container");
- if (relativeUrl == null)
- throw new ArgumentNullException("relativeUrl");
- if (String.IsNullOrWhiteSpace(localPath))
- throw new ArgumentNullException("localPath");
- if (!Path.IsPathRooted(localPath))
- throw new ArgumentException("The localPath must be rooted", "localPath");
- Contract.EndContractBlock();
+ var currentRelativepath = currentInfo.RelativeUrlToFilePath(accountInfo.UserName);
+ var newPath = Path.Combine(fileAgent.RootPath, currentRelativepath);
- //Calculate the relative file path for the new file
- var relativePath = relativeUrl.RelativeUriToFilePath();
- //The file will be stored in a temporary location while downloading with an extension .download
- var tempPath = Path.Combine(FileAgent.FragmentsPath, relativePath + ".download");
- //Make sure the target folder exists. DownloadFileTask will not create the folder
- var directoryPath = Path.GetDirectoryName(tempPath);
- if (!Directory.Exists(directoryPath))
- Directory.CreateDirectory(directoryPath);
-
- //Download the object to the temporary location
- var getObject = CloudClient.GetObject(container, relativeUrl.ToString(), tempPath).ContinueWith(t =>
+ var isFile= (previousFile is FileInfo);
+ var previousFullPath = isFile?
+ FileInfoExtensions.GetProperFilePathCapitalization(previousFile.FullName):
+ FileInfoExtensions.GetProperDirectoryCapitalization(previousFile.FullName);
+
+ using (NetworkGate.Acquire(previousFullPath, NetworkOperation.Renaming))
+ using (NetworkGate.Acquire(newPath,NetworkOperation.Renaming))
+ using (new SessionScope(FlushAction.Auto))
{
- //And move it to its actual location once downloading is finished
- if (File.Exists(localPath))
- File.Replace(tempPath,localPath,null,true);
+ if (isFile)
+ (previousFile as FileInfo).MoveTo(newPath);
else
- File.Move(tempPath,localPath);
- });
- return getObject;
+ {
+ (previousFile as DirectoryInfo).MoveTo(newPath);
+ }
+ var state = StatusKeeper.GetStateByFilePath(previousFullPath);
+ state.FilePath = newPath;
+ state.SaveCopy();
+ StatusKeeper.SetFileState(previousFullPath,FileStatus.Deleted,FileOverlayStatus.Deleted, "Deleted");
+ }
}
- public Task DownloadWithBlocks(string container,Uri relativeUrl, string localPath,TreeHash serverHash)
+ private async Task SyncFiles(AccountInfo accountInfo,CloudAction action)
{
- if (String.IsNullOrWhiteSpace(container))
- throw new ArgumentNullException("container");
- if (relativeUrl == null)
- throw new ArgumentNullException("relativeUrl");
- if (String.IsNullOrWhiteSpace(localPath))
- throw new ArgumentNullException("localPath");
- if (!Path.IsPathRooted(localPath))
- throw new ArgumentException("The localPath must be rooted", "localPath");
- if(serverHash==null)
- throw new ArgumentNullException("serverHash");
+ if (accountInfo == null)
+ throw new ArgumentNullException("accountInfo");
+ if (action==null)
+ throw new ArgumentNullException("action");
+ if (action.LocalFile==null)
+ throw new ArgumentException("The action's local file is not specified","action");
+ if (!Path.IsPathRooted(action.LocalFile.FullName))
+ throw new ArgumentException("The action's local file path must be absolute","action");
+ if (action.CloudFile== null)
+ throw new ArgumentException("The action's cloud file is not specified", "action");
Contract.EndContractBlock();
+ using (ThreadContext.Stacks["Operation"].Push("SyncFiles"))
+ {
- //Calculate the relative file path for the new file
- var relativePath = relativeUrl.RelativeUriToFilePath();
- //The file will be stored in a temporary location while downloading with an extension .download
- var tempPath = Path.Combine(FileAgent.FragmentsPath, relativePath + ".download");
- var directoryPath = Path.GetDirectoryName(tempPath);
- if (!Directory.Exists(directoryPath))
- Directory.CreateDirectory(directoryPath);
-
- //If the local file exists we should make a copy of it to the
- //fragments folder, unless a newer temp copy already exists, which
- //means there is an interrupted download
- if (ShouldCopy(localPath, tempPath))
- File.Copy(localPath, tempPath, true);
+ //var localFile = action.LocalFile;
+ var cloudFile = action.CloudFile;
+ var downloadPath = action.LocalFile.GetProperCapitalization();
- //Set the size of the file to the size specified in the treehash
- //This will also create an empty file if the file doesn't exist
- SetFileSize(tempPath, serverHash.Bytes);
+ var cloudHash = cloudFile.Hash.ToLower();
+ var previousCloudHash = cloudFile.PreviousHash == null?null: cloudFile.PreviousHash.ToLower();
+ var localHash = action.TreeHash.Value.TopHash.ToHashString();// LocalHash.Value.ToLower();
+ //var topHash = action.TopHash.Value.ToLower();
- return Task.Factory.StartNew(() =>
- {
- //Calculate the temp file's treehash
- var treeHash = Signature.CalculateTreeHashAsync(tempPath, this.BlockSize,BlockHash).Result;
-
- //And compare it with the server's hash
- var upHashes = serverHash.GetHashesAsStrings();
- var localHashes = treeHash.HashDictionary;
- for (int i = 0; i < upHashes.Length; i++)
+ if(cloudFile.IsDirectory && action.LocalFile is DirectoryInfo)
{
- //For every non-matching hash
- if (!localHashes.ContainsKey(upHashes[i]))
- {
- Trace.TraceInformation("[BLOCK GET] START {0} of {1} for {2}",i,upHashes.Length,localPath);
- var start = i*BlockSize;
- long? end = null;
- if (i < upHashes.Length - 1 )
- end= ((i + 1)*BlockSize) ;
-
- //Get its block
- var blockTask = CloudClient.GetBlock(container, relativeUrl,
- start, end);
-
- blockTask.ContinueWith(b =>
- {
- //And apply it to the temp file
- var buffer = b.Result;
- var stream =FileAsync.OpenWrite(tempPath);
- stream.Seek(start,SeekOrigin.Begin);
- return stream.WriteAsync(buffer, 0, buffer.Length)
- .ContinueWith(s => stream.Close());
-
- }).Unwrap()
- .Wait();
- Trace.TraceInformation("[BLOCK GET] FINISH {0} of {1} for {2}", i, upHashes.Length, localPath);
- }
+ Log.InfoFormat("Skipping folder {0} , exists in server", downloadPath);
+ return;
+ }
+ //At this point we know that an object has changed on the server and that a local
+ //file already exists. We need to decide whether the file has only changed on
+ //the server or there is a conflicting change on the client.
+ //
+
+ //If the hashes match, we are done
+ if (cloudFile != ObjectInfo.Empty && cloudHash == localHash)
+ {
+ Log.InfoFormat("Skipping {0}, hashes match", downloadPath);
+ return;
}
-
- //Replace the existing file with the temp
- if (File.Exists(localPath))
- File.Replace(tempPath, localPath, null, true);
- else
- File.Move(tempPath, localPath);
- Trace.TraceInformation("[BLOCK GET] COMPLETE {0}", localPath);
- });
- }
+ //If the local and remote files have 0 length their hashes will not match
+ if (!cloudFile.IsDirectory && cloudFile.Bytes==0 && action.LocalFile is FileInfo && (action.LocalFile as FileInfo).Length==0 )
+ {
+ Log.InfoFormat("Skipping {0}, files are empty", downloadPath);
+ return;
+ }
- //Change the file's size, possibly truncating or adding to it
- private static void SetFileSize(string filePath, long fileSize)
- {
- if (String.IsNullOrWhiteSpace(filePath))
- throw new ArgumentNullException("filePath");
- if (!Path.IsPathRooted(filePath))
- throw new ArgumentException("The filePath must be rooted", "filePath");
- if (fileSize<0)
- throw new ArgumentOutOfRangeException("fileSize");
- Contract.EndContractBlock();
+ //The hashes DON'T match. We need to sync
- using (var stream = File.Open(filePath, FileMode.OpenOrCreate, FileAccess.Write))
- {
- stream.SetLength(fileSize);
+ // If the previous tophash matches the local tophash, the file was only changed on the server.
+ if (localHash == previousCloudHash)
+ {
+ await Downloader.DownloadCloudFile(accountInfo, cloudFile, downloadPath, CurrentOperationCancelToken);
+ }
+ else
+ {
+ //If the previous and local hash don't match, there was a local conflict
+ //that was not uploaded to the server. We have a conflict
+ ReportConflictForMismatch(downloadPath);
+ }
}
}
- //Check whether we should copy the local file to a temp path
- private static bool ShouldCopy(string localPath, string tempPath)
+ private void ReportConflictForMismatch(string downloadPath)
{
- //No need to copy if there is no file
- if (!File.Exists(localPath))
- return false;
-
- //If there is no temp file, go ahead and copy
- if (!File.Exists(tempPath))
- return true;
+ if (String.IsNullOrWhiteSpace(downloadPath))
+ throw new ArgumentNullException("downloadPath");
+ Contract.EndContractBlock();
- //If there is a temp file and is newer than the actual file, don't copy
- var localLastWrite = File.GetLastWriteTime(localPath);
- var tempLastWrite = File.GetLastWriteTime(tempPath);
-
- //This could mean there is an interrupted download in progress
- return (tempLastWrite < localLastWrite);
+ StatusKeeper.SetFileState(downloadPath,FileStatus.Conflict, FileOverlayStatus.Conflict,"File changed at the server");
+ UpdateStatus(PithosStatus.HasConflicts);
+ var message = String.Format("Conflict detected for file {0}", downloadPath);
+ Log.Warn(message);
+ StatusNotification.NotifyChange(message, TraceLevel.Warning);
}
- private void UploadCloudFile(FileInfo fileInfo, string hash,string topHash)
+ public void Post(CloudAction cloudAction)
{
- if (fileInfo==null)
- throw new ArgumentNullException("fileInfo");
- if (String.IsNullOrWhiteSpace(hash))
- throw new ArgumentNullException("hash");
+ if (cloudAction == null)
+ throw new ArgumentNullException("cloudAction");
+ if (cloudAction.AccountInfo==null)
+ throw new ArgumentException("The CloudAction.AccountInfo is empty","cloudAction");
Contract.EndContractBlock();
- if (fileInfo.Extension.Equals("ignore", StringComparison.InvariantCultureIgnoreCase))
- return;
+ DeleteAgent.ProceedEvent.Wait();
- var url = fileInfo.AsRelativeUrlTo(FileAgent.RootPath);
-
- var fullFileName = fileInfo.FullName;
- using(var gate=NetworkGate.Acquire(fullFileName,NetworkOperation.Uploading))
- {
- //Abort if the file is already being uploaded or downloaded
- if (gate.Failed)
- return;
-
-
- //Even if GetObjectInfo times out, we can proceed with the upload
- var info = CloudClient.GetObjectInfo(PithosContainer, url);
+ if (cloudAction is CloudDeleteAction)
+ DeleteAgent.Post((CloudDeleteAction)cloudAction);
+ else
+ _agent.Post(cloudAction);
+ }
+
- //If the file hashes match, abort the upload
- if (hash.Equals(info.Hash, StringComparison.InvariantCultureIgnoreCase) ||
- topHash.Equals(info.Hash, StringComparison.InvariantCultureIgnoreCase))
- {
- //but store any metadata changes
- this.StatusKeeper.StoreInfo(fullFileName, info);
- Trace.TraceInformation("Skip upload of {0}, hashes match", fullFileName);
- return;
- }
+ public IEnumerable<CloudAction> GetEnumerable()
+ {
+ return _agent.GetEnumerable();
+ }
- //Mark the file as modified while we upload it
- var setStatus = Task.Factory.StartNew(() =>
- StatusKeeper.SetFileOverlayStatus(fullFileName, FileOverlayStatus.Modified));
- //And then upload it
+ public Task GetDeleteAwaiter()
+ {
+ return DeleteAgent.ProceedEvent.WaitAsync();
+ }
+ public CancellationToken CancellationToken
+ {
+ get { return _agent.CancellationToken; }
+ }
- //If the file is larger than the block size, try a hashmap PUT
- if (fileInfo.Length > BlockSize )
- {
- //To upload using a hashmap
- //First, calculate the tree hash
- var treeHash = Signature.CalculateTreeHashAsync(fileInfo.FullName, BlockSize, BlockHash);
-
- var putHashMap = setStatus.ContinueWith(t=>
- UploadWithHashMap(fileInfo,url,treeHash));
-
- putHashMap.Wait();
- }
+ public bool Pause
+ {
+ get {
+ return _pause;
+ }
+ set {
+ _pause = value;
+ if (_pause)
+ _unPauseEvent.Reset();
else
{
- //Otherwise do a regular PUT
- var put = setStatus.ContinueWith(t =>
- CloudClient.PutObject(PithosContainer,url,fullFileName,hash));
- put.Wait();
+ _unPauseEvent.Set();
}
- //If everything succeeds, change the file and overlay status to normal
- this.StatusKeeper.SetFileState(fullFileName, FileStatus.Unchanged, FileOverlayStatus.Normal);
}
- //Notify the Shell to update the overlays
- NativeMethods.RaiseChangeNotification(fullFileName);
- StatusNotification.NotifyChangedFile(fullFileName);
}
- public void UploadWithHashMap(FileInfo fileInfo,string url,Task<TreeHash> treeHash)
- {
- var fullFileName = fileInfo.FullName;
- //Send the hashmap to the server
- var hashPut = CloudClient.PutHashMap(PithosContainer, url, treeHash.Result);
- var missingHashes = hashPut.Result;
- if (missingHashes.Count == 0)
- return;
+ private void RenameCloudFile(AccountInfo accountInfo,CloudMoveAction action)
+ {
+ if (accountInfo==null)
+ throw new ArgumentNullException("accountInfo");
+ if (action==null)
+ throw new ArgumentNullException("action");
+ if (action.CloudFile==null)
+ throw new ArgumentException("CloudFile","action");
+ if (action.LocalFile==null)
+ throw new ArgumentException("LocalFile","action");
+ if (action.OldLocalFile==null)
+ throw new ArgumentException("OldLocalFile","action");
+ if (action.OldCloudFile==null)
+ throw new ArgumentException("OldCloudFile","action");
+ Contract.EndContractBlock();
- var buffer = new byte[BlockSize];
- foreach (var missingHash in missingHashes)
+ using (ThreadContext.Stacks["Operation"].Push("RenameCloudFile"))
{
- int blockIndex = -1;
- try
- {
- //Find the proper block
- blockIndex = treeHash.Result.HashDictionary[missingHash];
- var offset = blockIndex*BlockSize;
- var read = fileInfo.Read(buffer, offset, BlockSize);
- if (read > 0)
- {
- //Copy the actual block data out of the buffer
- var data = new byte[read];
- Buffer.BlockCopy(buffer, 0, data, 0, read);
-
- //And POST them
- CloudClient.PostBlock(PithosContainer, data).Wait();
- Trace.TraceInformation("[BLOCK] Block {0} of {1} uploaded", blockIndex,
- fullFileName);
- }
- }
- catch (Exception exc)
- {
- Trace.TraceError("[ERROR] uploading block {0} of {1}\n{2}", blockIndex, fullFileName, exc);
- }
- }
+ var newFilePath = action.LocalFile.FullName;
- UploadWithHashMap(fileInfo, url, treeHash);
-
+ //How do we handle concurrent renames and deletes/uploads/downloads?
+ //* A conflicting upload means that a file was renamed before it had a chance to finish uploading
+ // This should never happen as the network agent executes only one action at a time
+ //* A conflicting download means that the file was modified on the cloud. While we can go on and complete
+ // the rename, there may be a problem if the file is downloaded in blocks, as subsequent block requests for the
+ // same name will fail.
+ // This should never happen as the network agent executes only one action at a time.
+ //* A conflicting delete can happen if the rename was followed by a delete action that didn't have the chance
+ // to remove the rename from the queue.
+ // We can probably ignore this case. It will result in an error which should be ignored
+
+
+ //The local file is already renamed
+ StatusKeeper.SetFileOverlayStatus(newFilePath, FileOverlayStatus.Modified).Wait();
+
+
+ var account = action.CloudFile.Account ?? accountInfo.UserName;
+ var container = action.CloudFile.Container;
+
+ var client = new CloudFilesClient(accountInfo);
+ //TODO: What code is returned when the source file doesn't exist?
+ client.MoveObject(account, container, action.OldCloudFile.Name, container, action.CloudFile.Name);
+
+ StatusKeeper.SetFileStatus(newFilePath, FileStatus.Unchanged);
+ StatusKeeper.SetFileOverlayStatus(newFilePath, FileOverlayStatus.Normal).Wait();
+ NativeMethods.RaiseChangeNotification(newFilePath);
+ }
}
+
+
}
projects / pithos-ms-client / blobdiff