-using System;
+// -----------------------------------------------------------------------
+// <copyright file="NetworkAgent.cs" company="GRNET">
+// Copyright 2011 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>
+// -----------------------------------------------------------------------
+
+using System;
+using System.Collections.Concurrent;
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.Threading;
using System.Threading.Tasks;
+using System.Threading.Tasks.Dataflow;
+using Castle.ActiveRecord;
using Pithos.Interfaces;
using Pithos.Network;
+using log4net;
namespace Pithos.Core.Agents
{
+ //TODO: Ensure all network operations use exact casing. Pithos is case sensitive
[Export]
public class NetworkAgent
{
private Agent<CloudAction> _agent;
- [Import]
+ //A separate agent is used to execute delete actions immediatelly;
+ private ActionBlock<CloudDeleteAction> _deleteAgent;
+ readonly ConcurrentDictionary<string,DateTime> _deletedFiles=new ConcurrentDictionary<string, DateTime>();
+
+
+ private readonly ManualResetEventSlim _pauseAgent = new ManualResetEventSlim(true);
+
+ [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 static readonly ILog Log = LogManager.GetLogger("NetworkAgent");
- /*
- [Import]
- public IPithosWorkflow Workflow { get; set; }
-*/
+ private readonly ConcurrentBag<AccountInfo> _accounts = new ConcurrentBag<AccountInfo>();
+ [System.ComponentModel.Composition.Import]
+ public IPithosSettings Settings { get; set; }
- public string PithosContainer { get; set; }
- public string TrashContainer { get; private set; }
+ private bool _firstPoll = true;
+ private TaskCompletionSource<bool> _tcs;
- public int BlockSize { get; set; }
- public string BlockHash { get; set; }
-
-
- public void Start(string pithosContainer, string trashContainer, int blockSize, string blockHash)
+ public void Start()
{
- if (String.IsNullOrWhiteSpace(pithosContainer))
- throw new ArgumentNullException("pithosContainer");
- if (String.IsNullOrWhiteSpace(trashContainer))
- throw new ArgumentNullException("trashContainer");
- Contract.EndContractBlock();
-
- PithosContainer = pithosContainer;
- TrashContainer = trashContainer;
- BlockSize = blockSize;
- BlockHash = blockHash;
-
-
+ _firstPoll = true;
_agent = Agent<CloudAction>.Start(inbox =>
{
Action loop = null;
loop = () =>
{
+ _pauseAgent.Wait();
var message = inbox.Receive();
-
-/*
- var process=Process(message);
+ var process=message.Then(Process,inbox.CancellationToken);
inbox.LoopAsync(process, loop);
+ };
+ loop();
+ });
+
+ _deleteAgent = new ActionBlock<CloudDeleteAction>(message =>ProcessDelete(message),new ExecutionDataflowBlockOptions{MaxDegreeOfParallelism=4});
+ /*
+ Action loop = null;
+ loop = () =>
+ {
+ var message = inbox.Receive();
+ var process = message.Then(ProcessDelete,inbox.CancellationToken);
+ inbox.LoopAsync(process, loop);
+ };
+ loop();
*/
-/*
- process1.ContinueWith(t =>
+ }
+
+ private async Task Process(CloudAction action)
+ {
+ if (action == null)
+ throw new ArgumentNullException("action");
+ if (action.AccountInfo==null)
+ throw new ArgumentException("The action.AccountInfo is empty","action");
+ Contract.EndContractBlock();
+
+ var accountInfo = action.AccountInfo;
+
+ using (log4net.ThreadContext.Stacks["NETWORK"].Push("PROCESS"))
+ {
+ Log.InfoFormat("[ACTION] Start Processing {0}", action);
+
+ var cloudFile = action.CloudFile;
+ var downloadPath = action.GetDownloadPath();
+
+ try
+ {
+
+ if (action.Action == CloudActionType.DeleteCloud)
{
- inbox.DoAsync(loop);
- if (t.IsFaulted)
+ //Redirect deletes to the delete agent
+ _deleteAgent.Post((CloudDeleteAction)action);
+ }
+ if (IsDeletedFile(action))
+ {
+ //Clear the status of already deleted files to avoid reprocessing
+ if (action.LocalFile != null)
+ this.StatusKeeper.ClearFileStatus(action.LocalFile.FullName);
+ }
+ else
+ {
+ switch (action.Action)
{
- var ex = t.Exception.InnerException;
- if (ex is OperationCanceledException)
- inbox.Stop();
+ case CloudActionType.UploadUnconditional:
+ //Abort if the file was deleted before we reached this point
+ await UploadCloudFile(action);
+ break;
+ case CloudActionType.DownloadUnconditional:
+ await DownloadCloudFile(accountInfo, cloudFile, downloadPath);
+ break;
+ case CloudActionType.RenameCloud:
+ var moveAction = (CloudMoveAction) action;
+ RenameCloudFile(accountInfo, moveAction);
+ break;
+ case CloudActionType.MustSynch:
+ if (!File.Exists(downloadPath) && !Directory.Exists(downloadPath))
+ {
+ await DownloadCloudFile(accountInfo, cloudFile, downloadPath);
+ }
+ else
+ {
+ await SyncFiles(accountInfo, action);
+ }
+ break;
}
- });
-*/
- //inbox.DoAsync(loop);
+ }
+ Log.InfoFormat("[ACTION] End Processing {0}:{1}->{2}", action.Action, action.LocalFile,
+ action.CloudFile.Name);
+ }
+ catch (WebException exc)
+ {
+ Log.ErrorFormat("[WEB ERROR] {0} : {1} -> {2} due to exception\r\n{3}", action.Action, action.LocalFile, action.CloudFile, exc);
+ }
+ catch (OperationCanceledException)
+ {
+ throw;
+ }
+ catch (DirectoryNotFoundException)
+ {
+ 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));
+ }
+ catch (FileNotFoundException)
+ {
+ 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));
+ }
+ catch (Exception exc)
+ {
+ Log.ErrorFormat("[REQUEUE] {0} : {1} -> {2} due to exception\r\n{3}",
+ action.Action, action.LocalFile, action.CloudFile, exc);
+ _agent.Post(action);
+ }
+ }
+ }
- var process = message.ContinueWith(t =>
- {
- var action = t.Result;
-
- Process(action);
- inbox.DoAsync(loop);
- });
+ /// <summary>
+ /// Processes cloud delete actions
+ /// </summary>
+ /// <param name="action">The delete action to execute</param>
+ /// <returns></returns>
+ /// <remarks>
+ /// When a file/folder is deleted locally, we must delete it ASAP from the server and block any download
+ /// operations that may be in progress.
+ /// <para>
+ /// A separate agent is used to process deletes because the main agent may be busy with a long operation.
+ /// </para>
+ /// </remarks>
+ private async Task ProcessDelete(CloudDeleteAction action)
+ {
+ if (action == null)
+ throw new ArgumentNullException("action");
+ if (action.AccountInfo==null)
+ throw new ArgumentException("The action.AccountInfo is empty","action");
+ Contract.EndContractBlock();
+
+ var accountInfo = action.AccountInfo;
- process.ContinueWith(t =>
+ using (log4net.ThreadContext.Stacks["NETWORK"].Push("PROCESS"))
+ {
+ Log.InfoFormat("[ACTION] Start Processing {0}", action);
+
+ var cloudFile = action.CloudFile;
+
+ try
+ {
+ //Acquire a lock on the deleted file to prevent uploading/downloading operations from the normal
+ //agent
+ using (var gate = NetworkGate.Acquire(action.LocalFile.FullName, NetworkOperation.Deleting))
{
- inbox.DoAsync(loop);
- if (t.IsFaulted)
- {
- var ex = t.Exception.InnerException;
- if (ex is OperationCanceledException)
- inbox.Stop();
- }
- });
+ //Add the file URL to the deleted files list
+ var key = GetFileKey(action.CloudFile);
+ _deletedFiles[key] = DateTime.Now;
- };
- loop();
- });
+ _pauseAgent.Reset();
+ // and then delete the file from the server
+ DeleteCloudFile(accountInfo, cloudFile);
+
+ Log.InfoFormat("[ACTION] End Delete {0}:{1}->{2}", action.Action, action.LocalFile,
+ action.CloudFile.Name);
+ }
+ }
+ catch (WebException exc)
+ {
+ Log.ErrorFormat("[WEB ERROR] {0} : {1} -> {2} due to exception\r\n{3}", action.Action, action.LocalFile, action.CloudFile, exc);
+ }
+ catch (OperationCanceledException)
+ {
+ throw;
+ }
+ catch (DirectoryNotFoundException)
+ {
+ Log.ErrorFormat("{0} : {1} -> {2} failed because the directory was not found.\n Rescheduling a delete",
+ action.Action, action.LocalFile, action.CloudFile);
+ //Repost a delete action for the missing file
+ _deleteAgent.Post(action);
+ }
+ catch (FileNotFoundException)
+ {
+ 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
+ _deleteAgent.Post(action);
+ }
+ catch (Exception exc)
+ {
+ Log.ErrorFormat("[REQUEUE] {0} : {1} -> {2} due to exception\r\n{3}",
+ action.Action, action.LocalFile, action.CloudFile, exc);
+
+ _deleteAgent.Post(action);
+ }
+ finally
+ {
+ if (_deleteAgent.InputCount == 0)
+ _pauseAgent.Set();
+
+ }
+ }
+ }
+
+ private static string GetFileKey(ObjectInfo info)
+ {
+ var key = String.Format("{0}/{1}/{2}", info.Account, info.Container,info.Name);
+ return key;
}
+ private async Task SyncFiles(AccountInfo accountInfo,CloudAction action)
+ {
+ 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();
+
+ var localFile = action.LocalFile;
+ var cloudFile = action.CloudFile;
+ var downloadPath=action.LocalFile.GetProperCapitalization();
+
+ var cloudHash = cloudFile.Hash.ToLower();
+ var localHash = action.LocalHash.Value.ToLower();
+ var topHash = action.TopHash.Value.ToLower();
+
+ //Not enough to compare only the local hashes, also have to compare the tophashes
+
+ //If any of the hashes match, we are done
+ if ((cloudHash == localHash || cloudHash == topHash))
+ {
+ Log.InfoFormat("Skipping {0}, hashes match",downloadPath);
+ return;
+ }
+
+ //The hashes DON'T match. We need to sync
+ var lastLocalTime = localFile.LastWriteTime;
+ var lastUpTime = cloudFile.Last_Modified;
+
+ //If the local file is newer upload it
+ if (lastUpTime <= lastLocalTime)
+ {
+ //It probably means it was changed while the app was down
+ UploadCloudFile(action);
+ }
+ else
+ {
+ //It the cloud file has a later date, it was modified by another user or computer.
+ //We need to check the local file's status
+ var status = StatusKeeper.GetFileStatus(downloadPath);
+ switch (status)
+ {
+ case FileStatus.Unchanged:
+ //If the local file's status is Unchanged, we can go on and download the newer cloud file
+ await DownloadCloudFile(accountInfo,cloudFile,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.
+ case FileStatus.Created:
+ //If the local file is Created, it means that the local and cloud files aren't related,
+ // yet they have the same name.
+
+ //In both cases we must mark the file as in conflict
+ ReportConflict(downloadPath);
+ break;
+ default:
+ //Other cases should never occur. Mark them as Conflict as well but log a warning
+ ReportConflict(downloadPath);
+ Log.WarnFormat("Unexcepted status {0} for file {1}->{2}", status,
+ downloadPath, action.CloudFile.Name);
+ break;
+ }
+ }
+ }
+
+ private void ReportConflict(string downloadPath)
+ {
+ if (String.IsNullOrWhiteSpace(downloadPath))
+ throw new ArgumentNullException("downloadPath");
+ Contract.EndContractBlock();
+
+ StatusKeeper.SetFileOverlayStatus(downloadPath, FileOverlayStatus.Conflict);
+ var message = String.Format("Conflict detected for file {0}", downloadPath);
+ Log.Warn(message);
+ StatusNotification.NotifyChange(message, TraceLevel.Warning);
+ }
public void Post(CloudAction cloudAction)
{
if (cloudAction == null)
throw new ArgumentNullException("cloudAction");
+ if (cloudAction.AccountInfo==null)
+ throw new ArgumentException("The CloudAction.AccountInfo is empty","cloudAction");
Contract.EndContractBlock();
-
+
+ _pauseAgent.Wait();
+
//If the action targets a local file, add a treehash calculation
- if (cloudAction.LocalFile != null)
+ if (!(cloudAction is CloudDeleteAction) && cloudAction.LocalFile as FileInfo != null)
{
- cloudAction.TopHash = new Lazy<string>(() => Signature.CalculateTreeHashAsync(cloudAction.LocalFile,
- BlockSize, BlockHash).Result
- .TopHash.ToHashString());
-
+ var accountInfo = cloudAction.AccountInfo;
+ var localFile = (FileInfo) cloudAction.LocalFile;
+ if (localFile.Length > accountInfo.BlockSize)
+ cloudAction.TopHash =
+ new Lazy<string>(() => Signature.CalculateTreeHashAsync(localFile,
+ accountInfo.BlockSize,
+ accountInfo.BlockHash).Result
+ .TopHash.ToHashString());
+ else
+ {
+ cloudAction.TopHash = new Lazy<string>(() => cloudAction.LocalHash.Value);
+ }
+ }
+ else
+ {
+ //The hash for a directory is the empty string
+ cloudAction.TopHash = new Lazy<string>(() => String.Empty);
}
- _agent.Post(cloudAction);
+
+ if (cloudAction is CloudDeleteAction)
+ _deleteAgent.Post((CloudDeleteAction)cloudAction);
+ else
+ _agent.Post(cloudAction);
}
- class ObjectInfoByNameComparer:IEqualityComparer<ObjectInfo>
+ /* class ObjectInfoByNameComparer:IEqualityComparer<ObjectInfo>
{
public bool Equals(ObjectInfo x, ObjectInfo y)
{
{
return obj.Name.ToLower().GetHashCode();
}
- }
+ }*/
- public Task ProcessRemoteFiles(string accountPath,DateTime? since=null)
- {
+ public void SynchNow()
+ {
+ if (_tcs!=null)
+ _tcs.SetResult(true);
+ else
+ {
+ //TODO: This may be OK for testing purposes, but we have no guarantee that it will
+ //work properly in production
+ PollRemoteFiles(repeat:false);
+ }
+ }
- Trace.CorrelationManager.StartLogicalOperation();
- Trace.TraceInformation("[LISTENER] Scheduled");
- var listObjects = Task.Factory.StartNewDelayed(10000).ContinueWith(t =>
- CloudClient.ListObjects(PithosContainer,since));
+ //Remote files are polled periodically. Any changes are processed
+ public async Task PollRemoteFiles(DateTime? since = null,bool repeat=true)
+ {
- DateTime nextSince = DateTime.Now.AddSeconds(-1);
+ _tcs = new TaskCompletionSource<bool>();
+ var wait = TaskEx.Delay(TimeSpan.FromSeconds(Settings.PollingInterval), _agent.CancellationToken);
+ var signaledTask=await TaskEx.WhenAny(_tcs.Task,wait);
+ //If polling is signalled by SynchNow, ignore the since tag
+ if (signaledTask is Task<bool>)
+ since = null;
- var enqueueFiles = listObjects.ContinueWith(task =>
+ using (log4net.ThreadContext.Stacks["Retrieve Remote"].Push("All accounts"))
{
- if (task.IsFaulted)
+
+ try
{
- //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");
+ //Next time we will check for all changes since the current check minus 1 second
+ //This is done to ensure there are no discrepancies due to clock differences
+ DateTime nextSince = DateTime.Now.AddSeconds(-1);
- var remoteObjects = task.Result;
+ var tasks = from accountInfo in _accounts
+ select ProcessAccountFiles(accountInfo, since);
- var remote=from info in remoteObjects
- let name=info.Name
- where !name.EndsWith(".ignore",StringComparison.InvariantCultureIgnoreCase) &&
- !name.StartsWith("fragments/",StringComparison.InvariantCultureIgnoreCase)
- select info;
+ await TaskEx.WhenAll(tasks.ToList());
- 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)
+ _firstPoll = false;
+ if (repeat)
+ PollRemoteFiles(nextSince);
+ }
+ catch (Exception ex)
{
- 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))
- {
- var localFile = FileAgent.GetFileInfo(relativePath);
- var state=FileState.FindByFilePath(localFile.FullName);
- commonObjects.Add(Tuple.Create(objectInfo, localFile,state));
- }
- else
- //If there is no match we add them to the localFiles list
- remoteOnly.Add(objectInfo);
+ Log.ErrorFormat("Error while processing accounts\r\n{0}",ex);
+ //In case of failure retry with the same parameter
+ PollRemoteFiles(since);
}
+
+
+ }
+ }
- //At the end of the iteration, the *remote* list will contain the files that exist
- //only on the server
+ public async Task ProcessAccountFiles(AccountInfo accountInfo,DateTime? since=null)
+ {
+ if (accountInfo==null)
+ throw new ArgumentNullException("accountInfo");
+ if (String.IsNullOrWhiteSpace(accountInfo.AccountPath))
+ throw new ArgumentException("The AccountInfo.AccountPath is empty","accountInfo");
+ Contract.EndContractBlock();
- //Remote files should be downloaded
- var actionsForRemote = from upFile in remoteOnly
- select new CloudAction(CloudActionType.DownloadUnconditional,upFile);
+ using (log4net.ThreadContext.Stacks["Retrieve Remote"].Push(accountInfo.UserName))
+ {
+ Log.Info("Scheduled");
+ var client=new CloudFilesClient(accountInfo);
- //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);
+ var containers = client.ListContainers(accountInfo.UserName);
+ CreateContainerFolders(accountInfo, containers);
+
+ try
+ {
+ _pauseAgent.Wait();
+ //Get the poll time now. We may miss some deletions but it's better to keep a file that was deleted
+ //than delete a file that was created while we were executing the poll
+ var pollTime = DateTime.Now;
+
+ //Get the list of server objects changed since the last check
+ //The name of the container is passed as state in order to create a dictionary of tasks in a subsequent step
+ var listObjects = from container in containers
+ select Task<IList<ObjectInfo>>.Factory.StartNew(_ =>
+ client.ListObjects(accountInfo.UserName,container.Name, since),container.Name);
+
- //Collect all the actions
- var allActions = actionsForRemote.Union(actionsForCommon);
+ var listTasks = await Task.Factory.WhenAll(listObjects.ToArray());
- //And remove those that are already being processed by the agent
- var distinctActions =allActions
- .Except(_agent.GetEnumerable(), new PithosMonitor.LocalFileComparer())
- .ToList();
+ using (log4net.ThreadContext.Stacks["SCHEDULE"].Push("Process Results"))
+ {
+ var dict = listTasks.ToDictionary(t => t.AsyncState);
+
+ //Get all non-trash objects. Remember, the container name is stored in AsyncState
+ var remoteObjects = from objectList in listTasks
+ where (string) objectList.AsyncState != "trash"
+ from obj in objectList.Result
+ select obj;
+
+ //TODO: Change the way deleted objects are detected.
+ //The list operation returns all existing objects so we could detect deleted remote objects
+ //by detecting objects that exist only locally. There are several cases where this is NOT the case:
+ //1. The first time the application runs, as there may be files that were added while
+ // the application was down.
+ //2. An object that is currently being uploaded will not appear in the remote list
+ // until the upload finishes.
+ // SOLUTION 1: Check the upload/download queue for the file
+ // SOLUTION 2: Check the SQLite states for the file's entry. If it is being uploaded,
+ // or its last modification was after the current poll, don't delete it. This way we don't
+ // delete objects whose upload finished too late to be included in the list.
+ //We need to detect and protect against such situations
+ //TODO: Does FileState have a LastModification field?
+ //TODO: How do we update the LastModification field? Do we need to add SQLite triggers?
+ // Do we need to use a proper SQLite schema?
+ // We can create a trigger with
+ // CREATE TRIGGER IF NOT EXISTS update_last_modified UPDATE ON FileState FOR EACH ROW
+ // BEGIN
+ // UPDATE FileState SET LastModification=datetime('now') WHERE Id=old.Id;
+ // END;
+ //
+ //NOTE: Some files may have been deleted remotely while the application was down.
+ // We DO have to delete those files. Checking the trash makes it easy to detect them,
+ // Otherwise, we can't be really sure whether we need to upload or delete
+ // the local-only files.
+ // SOLUTION 1: Ask the user when such a local-only file is detected during the first poll.
+ // SOLUTION 2: Mark conflict and ask the user as in #1
+
+ var trashObjects = dict["trash"].Result;
+ //var sharedObjects = ((Task<IList<ObjectInfo>>) task.Result[2]).Result;
+
+ //Items with the same name, hash may be both in the container and the trash
+ //Don't delete items that exist in the container
+ var realTrash = from trash in trashObjects
+ where
+ !remoteObjects.Any(
+ info => info.Name == trash.Name && info.Hash == trash.Hash)
+ select trash;
+ ProcessTrashedFiles(accountInfo, realTrash);
+
+
+ var cleanRemotes = (from info in remoteObjects
+ //.Union(sharedObjects)
+ let name = info.Name
+ where !name.EndsWith(".ignore", StringComparison.InvariantCultureIgnoreCase) &&
+ !name.StartsWith(FolderConstants.CacheFolder + "/",
+ StringComparison.InvariantCultureIgnoreCase)
+ select info).ToList();
+
+
+
+ ProcessDeletedFiles(accountInfo, cleanRemotes, pollTime);
+
+ //Create a list of actions from the remote files
+ var allActions = ObjectsToActions(accountInfo, cleanRemotes);
+
+
+ //var relativePath = objectInfo.RelativeUrlToFilePath(accountInfo.UserName);
+
+ //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)
+ {
+ Post(message);
+ }
- //Queue all the actions
- foreach (var message in distinctActions)
+ Log.Info("[LISTENER] End Processing");
+ }
+ }
+ catch (Exception ex)
{
- Post(message);
+ Log.ErrorFormat("[FAIL] ListObjects for{0} in ProcessRemoteFiles with {1}", accountInfo.UserName, ex);
+ return;
}
+ Log.Info("[LISTENER] Finished");
- if(remoteOnly.Count>0)
- StatusNotification.NotifyChange(String.Format("Processing {0} new files", remoteOnly.Count));
-
- Trace.TraceInformation("[LISTENER] End Processing");
- Trace.CorrelationManager.StopLogicalOperation();
+ }
+ }
- });
+ /// <summary>
+ /// Deletes local files that are not found in the list of cloud files
+ /// </summary>
+ /// <param name="accountInfo"></param>
+ /// <param name="cloudFiles"></param>
+ /// <param name="pollTime"></param>
+ private void ProcessDeletedFiles(AccountInfo accountInfo, IEnumerable<ObjectInfo> cloudFiles, DateTime pollTime)
+ {
+ if (accountInfo == null)
+ throw new ArgumentNullException("accountInfo");
+ if (String.IsNullOrWhiteSpace(accountInfo.AccountPath))
+ throw new ArgumentException("The AccountInfo.AccountPath is empty", "accountInfo");
+ if (cloudFiles == null)
+ throw new ArgumentNullException("cloudFiles");
+ Contract.EndContractBlock();
- var loop = enqueueFiles.ContinueWith(t =>
+ //Check the Modified date to ensure that were just created and haven't been uploaded yet
+ //NOTE: The NHibernate LINQ provider doesn't support custom functions so we need to break the query
+ //in two steps
+ //NOTE: DON'T return files that are already in conflict. The first poll would mark them as
+ //"In Conflict" but subsequent polls would delete them
+ var deleteCandidates = (from state in FileState.Queryable
+ where
+ state.Modified <= pollTime
+ && state.FilePath.StartsWith(accountInfo.AccountPath)
+ && state.FileStatus != FileStatus.Conflict
+ select state).ToList();
+
+ var filesToDelete = (from deleteCandidate in deleteCandidates
+ let localFile = FileInfoExtensions.FromPath(deleteCandidate.FilePath)
+ let relativeFilePath = localFile.AsRelativeTo(accountInfo.AccountPath)
+ where !cloudFiles.Any(r => Path.Combine(r.Container, r.Name) == relativeFilePath)
+ select localFile).ToList();
+
+ //On the first run
+ if (_firstPoll)
{
- if (t.IsFaulted)
+ //Set the status of missing files to Conflict
+ foreach (var item in filesToDelete)
{
- Trace.TraceError("[LISTENER] Exception: {0}", t.Exception);
+ StatusKeeper.SetFileState(item.FullName, FileStatus.Conflict, FileOverlayStatus.Deleted);
}
- else
+ StatusNotification.NotifyConflicts(filesToDelete, String.Format("{0} local files are missing from Pithos, possibly because they were deleted",filesToDelete.Count));
+ }
+ else
+ {
+ foreach (var item in filesToDelete)
{
- Trace.TraceInformation("[LISTENER] Finished");
+ item.Delete();
+ StatusKeeper.ClearFileStatus(item.FullName);
}
- ProcessRemoteFiles(accountPath, nextSince);
-
- });
- return loop;
+ StatusNotification.NotifyForFiles(filesToDelete, String.Format("{0} files were deleted",filesToDelete.Count),TraceLevel.Info);
+ }
+
}
-
- private Task Process(Task<CloudAction> action)
+ private static void CreateContainerFolders(AccountInfo accountInfo, IEnumerable<ContainerInfo> containers)
{
- return action.ContinueWith(t=> Process(t.Result));
- }
+ var containerPaths = from container in containers
+ let containerPath = Path.Combine(accountInfo.AccountPath, container.Name)
+ where container.Name != FolderConstants.TrashContainer && !Directory.Exists(containerPath)
+ select containerPath;
+ foreach (var path in containerPaths)
+ {
+ Directory.CreateDirectory(path);
+ }
+ }
- private void Process(CloudAction action)
+ //Creates an appropriate action for each server file
+ private IEnumerable<CloudAction> ObjectsToActions(AccountInfo accountInfo,IEnumerable<ObjectInfo> remote)
{
- if (action==null)
- throw new ArgumentNullException("action");
+ if (remote==null)
+ throw new ArgumentNullException();
Contract.EndContractBlock();
+ var fileAgent = GetFileAgent(accountInfo);
- 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
+ //In order to avoid multiple iterations over the files, we iterate only once
+ //over the remote files
+ foreach (var objectInfo in remote)
{
- switch (action.Action)
+ var relativePath = objectInfo.RelativeUrlToFilePath(accountInfo.UserName);
+ //and remove any matching objects from the list, adding them to the commonObjects list
+
+ if (fileAgent.Exists(relativePath))
{
- 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
+ //If a directory object already exists, we don't need to perform any other action
+ var localFile = fileAgent.GetFileSystemInfo(relativePath);
+ if (objectInfo.Content_Type == @"application/directory" && localFile is DirectoryInfo)
+ continue;
+ using (new SessionScope(FlushAction.Never))
+ {
+ var state = StatusKeeper.GetStateByFilePath(localFile.FullName);
+ //FileState.FindByFilePath(localFile.FullName);
+ //Common files should be checked on a per-case basis to detect differences, which is newer
- //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;
+ yield return new CloudAction(accountInfo, CloudActionType.MustSynch,
+ localFile, objectInfo, state, accountInfo.BlockSize,
+ accountInfo.BlockHash);
+ }
}
- Trace.TraceInformation("[ACTION] End Processing {0}:{1}->{2}", action.Action, action.LocalFile, action.CloudFile.Name);
- }
- catch (OperationCanceledException)
- {
- throw;
- }
- catch (Exception exc)
- {
- Trace.TraceError("[REQUEUE] {0} : {1} -> {2} due to exception\r\n{3}",
- action.Action, action.LocalFile, action.CloudFile, exc);
+ else
+ {
+ //If there is no match we add them to the localFiles list
+ //but only if the file is not marked for deletion
+ var targetFile = Path.Combine(accountInfo.AccountPath, relativePath);
+ var fileStatus = StatusKeeper.GetFileStatus(targetFile);
+ if (fileStatus != FileStatus.Deleted)
+ {
+ //Remote files should be downloaded
+ yield return new CloudDownloadAction(accountInfo,objectInfo);
+ }
+ }
+ }
+ }
- _agent.Post(action);
- }
+ private static FileAgent GetFileAgent(AccountInfo accountInfo)
+ {
+ return AgentLocator<FileAgent>.Get(accountInfo.AccountPath);
+ }
+ private void ProcessTrashedFiles(AccountInfo accountInfo,IEnumerable<ObjectInfo> trashObjects)
+ {
+ var fileAgent = GetFileAgent(accountInfo);
+ foreach (var trashObject in trashObjects)
+ {
+ var barePath = trashObject.RelativeUrlToFilePath(accountInfo.UserName);
+ //HACK: Assume only the "pithos" container is used. Must find out what happens when
+ //deleting a file from a different container
+ var relativePath = Path.Combine("pithos", barePath);
+ fileAgent.Delete(relativePath);
+ }
}
-
- private void RenameCloudFile(string oldFileName, string newPath, string newFileName)
+ private void RenameCloudFile(AccountInfo accountInfo,CloudMoveAction action)
{
- if (String.IsNullOrWhiteSpace(oldFileName))
- throw new ArgumentNullException("oldFileName");
- if (String.IsNullOrWhiteSpace(oldFileName))
- throw new ArgumentNullException("newPath");
- if (String.IsNullOrWhiteSpace(oldFileName))
- throw new ArgumentNullException("newFileName");
+ 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 newFilePath = action.LocalFile.FullName;
+
+ //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
- this.StatusKeeper.SetFileOverlayStatus(newPath, FileOverlayStatus.Modified);
+ StatusKeeper.SetFileOverlayStatus(newFilePath, FileOverlayStatus.Modified);
+
- CloudClient.MoveObject(PithosContainer, oldFileName, PithosContainer, newFileName);
+ 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);
- this.StatusKeeper.SetFileStatus(newPath, FileStatus.Unchanged);
- this.StatusKeeper.SetFileOverlayStatus(newPath, FileOverlayStatus.Normal);
- NativeMethods.RaiseChangeNotification(newPath);
+ StatusKeeper.SetFileStatus(newFilePath, FileStatus.Unchanged);
+ StatusKeeper.SetFileOverlayStatus(newFilePath, FileOverlayStatus.Normal);
+ NativeMethods.RaiseChangeNotification(newFilePath);
}
- 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");
+ private void DeleteCloudFile(AccountInfo accountInfo, ObjectInfo cloudFile)
+ {
+ if (accountInfo == null)
+ throw new ArgumentNullException("accountInfo");
+ if (cloudFile==null)
+ throw new ArgumentNullException("cloudFile");
+
+ if (String.IsNullOrWhiteSpace(cloudFile.Container))
+ throw new ArgumentException("Invalid container", "cloudFile");
Contract.EndContractBlock();
+
+ var fileAgent = GetFileAgent(accountInfo);
+
+ using ( log4net.ThreadContext.Stacks["DeleteCloudFile"].Push("Delete"))
+ {
+ var fileName= cloudFile.RelativeUrlToFilePath(accountInfo.UserName);
+ var info = fileAgent.GetFileSystemInfo(fileName);
+ var fullPath = info.FullName.ToLower();
- this.StatusKeeper.SetFileOverlayStatus(fileName, FileOverlayStatus.Modified);
+ StatusKeeper.SetFileOverlayStatus(fullPath, FileOverlayStatus.Modified);
- CloudClient.MoveObject(PithosContainer, fileName, TrashContainer, fileName);
+ var account = cloudFile.Account ?? accountInfo.UserName;
+ var container = cloudFile.Container ;//?? FolderConstants.PithosContainer;
- this.StatusKeeper.ClearFileStatus(fileName);
- this.StatusKeeper.RemoveFileOverlayStatus(fileName);
+ var client = new CloudFilesClient(accountInfo);
+ client.DeleteObject(account, container, cloudFile.Name);
+
+ StatusKeeper.ClearFileStatus(fullPath);
+ }
}
//Download a file.
- private void DownloadCloudFile(string container, Uri relativeUrl, string localPath)
+ private async Task DownloadCloudFile(AccountInfo accountInfo, ObjectInfo cloudFile , string filePath)
{
- 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 (cloudFile == null)
+ throw new ArgumentNullException("cloudFile");
+ if (String.IsNullOrWhiteSpace(cloudFile.Account))
+ throw new ArgumentNullException("cloudFile");
+ if (String.IsNullOrWhiteSpace(cloudFile.Container))
+ throw new ArgumentNullException("cloudFile");
+ if (String.IsNullOrWhiteSpace(filePath))
+ throw new ArgumentNullException("filePath");
+ if (!Path.IsPathRooted(filePath))
+ throw new ArgumentException("The filePath must be rooted", "filePath");
Contract.EndContractBlock();
+ var localPath = Interfaces.FileInfoExtensions.GetProperFilePathCapitalization(filePath);
+ var relativeUrl = new Uri(cloudFile.Name, UriKind.Relative);
+
var url = relativeUrl.ToString();
- if (url.EndsWith(".ignore",StringComparison.InvariantCultureIgnoreCase))
+ if (cloudFile.Name.EndsWith(".ignore", StringComparison.InvariantCultureIgnoreCase))
return;
+
//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");
+ //var hashPath = Path.Combine(FileAgent.CachePath, relativePath + ".hashmap");
- //Retrieve the hashmap from the server
- var getHashMap = CloudClient.GetHashMap(container,url);
- var downloadTask= getHashMap.ContinueWith(t =>
+ var client = new CloudFilesClient(accountInfo);
+ var account = cloudFile.Account;
+ var container = cloudFile.Container;
+
+ if (cloudFile.Content_Type == @"application/directory")
+ {
+ if (!Directory.Exists(localPath))
+ Directory.CreateDirectory(localPath);
+ }
+ else
{
- var serverHash=t.Result;
+ //Retrieve the hashmap from the server
+ var serverHash = await client.GetHashMap(account, container, url);
//If it's a small file
- return serverHash.Hashes.Count == 1
+ if (serverHash.Hashes.Count == 1)
//Download it in one go
- ? DownloadEntireFile(container, relativeUrl, localPath)
+ await
+ DownloadEntireFileAsync(accountInfo, client, cloudFile, relativeUrl, localPath, serverHash);
//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));
+ else
+ await DownloadWithBlocks(accountInfo, client, cloudFile, relativeUrl, localPath, serverHash);
- storeInfo.Wait();
- StatusNotification.NotifyChangedFile(localPath);
+ if (cloudFile.AllowedTo == "read")
+ {
+ var attributes = File.GetAttributes(localPath);
+ File.SetAttributes(localPath, attributes | FileAttributes.ReadOnly);
+ }
+ }
+ //Now we can store the object's metadata without worrying about ghost status entries
+ StatusKeeper.StoreInfo(localPath, cloudFile);
+
}
}
//Download a small file with a single GET operation
- private Task DownloadEntireFile(string container, Uri relativeUrl, string localPath)
+ private async Task DownloadEntireFileAsync(AccountInfo accountInfo, CloudFilesClient client, ObjectInfo cloudFile, Uri relativeUrl, string filePath,TreeHash serverHash)
{
- if (String.IsNullOrWhiteSpace(container))
- throw new ArgumentNullException("container");
+ if (client == null)
+ throw new ArgumentNullException("client");
+ if (cloudFile==null)
+ throw new ArgumentNullException("cloudFile");
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 (String.IsNullOrWhiteSpace(filePath))
+ throw new ArgumentNullException("filePath");
+ if (!Path.IsPathRooted(filePath))
+ throw new ArgumentException("The localPath must be rooted", "filePath");
Contract.EndContractBlock();
+ var localPath = Pithos.Interfaces.FileInfoExtensions.GetProperFilePathCapitalization(filePath);
+ //If the file already exists
+ if (File.Exists(localPath))
+ {
+ //First check with MD5 as this is a small file
+ var localMD5 = Signature.CalculateMD5(localPath);
+ var cloudHash=serverHash.TopHash.ToHashString();
+ if (localMD5==cloudHash)
+ return;
+ //Then check with a treehash
+ var localTreeHash = Signature.CalculateTreeHash(localPath, serverHash.BlockSize, serverHash.BlockHash);
+ var localHash = localTreeHash.TopHash.ToHashString();
+ if (localHash==cloudHash)
+ return;
+ }
+
+ var fileAgent = GetFileAgent(accountInfo);
//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 tempPath = Path.Combine(fileAgent.CachePath, 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);
+ var tempFolder = Path.GetDirectoryName(tempPath);
+ if (!Directory.Exists(tempFolder))
+ Directory.CreateDirectory(tempFolder);
//Download the object to the temporary location
- var getObject = CloudClient.GetObject(container, relativeUrl.ToString(), tempPath).ContinueWith(t =>
- {
- //And move it to its actual location once downloading is finished
- if (File.Exists(localPath))
- File.Replace(tempPath,localPath,null,true);
- else
- File.Move(tempPath,localPath);
- });
- return getObject;
+ await client.GetObject(cloudFile.Account, cloudFile.Container, relativeUrl.ToString(), tempPath);
+
+ //Create the local folder if it doesn't exist (necessary for shared objects)
+ var localFolder = Path.GetDirectoryName(localPath);
+ if (!Directory.Exists(localFolder))
+ Directory.CreateDirectory(localFolder);
+ //And move it to its actual location once downloading is finished
+ if (File.Exists(localPath))
+ File.Replace(tempPath,localPath,null,true);
+ else
+ File.Move(tempPath,localPath);
+ //Notify listeners that a local file has changed
+ StatusNotification.NotifyChangedFile(localPath);
+
+
}
- public Task DownloadWithBlocks(string container,Uri relativeUrl, string localPath,TreeHash serverHash)
+ //Download a file asynchronously using blocks
+ public async Task DownloadWithBlocks(AccountInfo accountInfo, CloudFilesClient client, ObjectInfo cloudFile, Uri relativeUrl, string filePath, TreeHash serverHash)
{
- if (String.IsNullOrWhiteSpace(container))
- throw new ArgumentNullException("container");
+ if (client == null)
+ throw new ArgumentNullException("client");
+ if (cloudFile == null)
+ throw new ArgumentNullException("cloudFile");
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)
+ if (String.IsNullOrWhiteSpace(filePath))
+ throw new ArgumentNullException("filePath");
+ if (!Path.IsPathRooted(filePath))
+ throw new ArgumentException("The filePath must be rooted", "filePath");
+ if (serverHash == null)
throw new ArgumentNullException("serverHash");
Contract.EndContractBlock();
-
+
+ var fileAgent = GetFileAgent(accountInfo);
+ var localPath = Interfaces.FileInfoExtensions.GetProperFilePathCapitalization(filePath);
+
//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 blockUpdater = new BlockUpdater(fileAgent.CachePath, localPath, relativePath, serverHash);
- //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);
-
- return Task.Factory.StartNew(() =>
- {
- //Calculate the temp file's treehash
- var treeHash = Signature.CalculateTreeHashAsync(tempPath, this.BlockSize,BlockHash).Result;
+
+
+ //Calculate the file's treehash
+ var treeHash = await Signature.CalculateTreeHashAsync(localPath, serverHash.BlockSize, serverHash.BlockHash);
- //And compare it with the server's hash
- var upHashes = serverHash.GetHashesAsStrings();
- var localHashes = treeHash.HashDictionary;
- for (int i = 0; i < upHashes.Length; i++)
+ //And compare it with the server's hash
+ var upHashes = serverHash.GetHashesAsStrings();
+ var localHashes = treeHash.HashDictionary;
+ for (int i = 0; i < upHashes.Length; i++)
+ {
+ //For every non-matching hash
+ var upHash = upHashes[i];
+ if (!localHashes.ContainsKey(upHash))
{
- //For every non-matching hash
- if (!localHashes.ContainsKey(upHashes[i]))
+ if (blockUpdater.UseOrphan(i, upHash))
{
- 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) ;
+ Log.InfoFormat("[BLOCK GET] ORPHAN FOUND for {0} of {1} for {2}", i, upHashes.Length, localPath);
+ continue;
+ }
+ Log.InfoFormat("[BLOCK GET] START {0} of {1} for {2}", i, upHashes.Length, localPath);
+ var start = i*serverHash.BlockSize;
+ //To download the last block just pass a null for the end of the range
+ long? end = null;
+ if (i < upHashes.Length - 1 )
+ end= ((i + 1)*serverHash.BlockSize) ;
- //Get its block
- var blockTask = CloudClient.GetBlock(container, relativeUrl,
- start, end);
+ //Download the missing block
+ var block = await client.GetBlock(cloudFile.Account, cloudFile.Container, relativeUrl, start, end);
+
+ //and store it
+ blockUpdater.StoreBlock(i, block);
- 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("[BLOCK GET] FINISH {0} of {1} for {2}", i, upHashes.Length, localPath);
}
-
+ }
- //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);
- });
+ //Want to avoid notifications if no changes were made
+ var hasChanges = blockUpdater.HasBlocks;
+ blockUpdater.Commit();
+
+ if (hasChanges)
+ //Notify listeners that a local file has changed
+ StatusNotification.NotifyChangedFile(localPath);
+
+ Log.InfoFormat("[BLOCK GET] COMPLETE {0}", localPath);
}
- //Change the file's size, possibly truncating or adding to it
- private static void SetFileSize(string filePath, long fileSize)
+
+ private async Task UploadCloudFile(CloudAction action)
{
- 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");
+ if (action == null)
+ throw new ArgumentNullException("action");
Contract.EndContractBlock();
- using (var stream = File.Open(filePath, FileMode.OpenOrCreate, FileAccess.Write))
+ try
{
- stream.SetLength(fileSize);
- }
- }
+ var accountInfo = action.AccountInfo;
- //Check whether we should copy the local file to a temp path
- private static bool ShouldCopy(string localPath, string tempPath)
- {
- //No need to copy if there is no file
- if (!File.Exists(localPath))
- return false;
+ var fileInfo = action.LocalFile;
- //If there is no temp file, go ahead and copy
- if (!File.Exists(tempPath))
- return true;
+ if (fileInfo.Extension.Equals("ignore", StringComparison.InvariantCultureIgnoreCase))
+ return;
+
+ var relativePath = fileInfo.AsRelativeTo(accountInfo.AccountPath);
+ if (relativePath.StartsWith(FolderConstants.OthersFolder))
+ {
+ var parts = relativePath.Split('\\');
+ var accountName = parts[1];
+ var oldName = accountInfo.UserName;
+ var absoluteUri = accountInfo.StorageUri.AbsoluteUri;
+ var nameIndex = absoluteUri.IndexOf(oldName);
+ var root = absoluteUri.Substring(0, nameIndex);
+
+ accountInfo = new AccountInfo
+ {
+ UserName = accountName,
+ AccountPath = Path.Combine(accountInfo.AccountPath, parts[0], parts[1]),
+ StorageUri = new Uri(root + accountName),
+ BlockHash = accountInfo.BlockHash,
+ BlockSize = accountInfo.BlockSize,
+ Token = accountInfo.Token
+ };
+ }
- //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);
- }
- private void UploadCloudFile(FileInfo fileInfo, string hash,string topHash)
- {
- if (fileInfo==null)
- throw new ArgumentNullException("fileInfo");
- if (String.IsNullOrWhiteSpace(hash))
- throw new ArgumentNullException("hash");
- Contract.EndContractBlock();
+ var fullFileName = fileInfo.GetProperCapitalization();
+ using (var gate = NetworkGate.Acquire(fullFileName, NetworkOperation.Uploading))
+ {
+ //Abort if the file is already being uploaded or downloaded
+ if (gate.Failed)
+ return;
- if (fileInfo.Extension.Equals("ignore", StringComparison.InvariantCultureIgnoreCase))
- return;
-
- var url = fileInfo.AsRelativeUrlTo(FileAgent.RootPath);
+ var cloudFile = action.CloudFile;
+ var account = cloudFile.Account ?? accountInfo.UserName;
- 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;
+ var client = new CloudFilesClient(accountInfo);
+ //Even if GetObjectInfo times out, we can proceed with the upload
+ var info = client.GetObjectInfo(account, cloudFile.Container, cloudFile.Name);
+ //If this is a read-only file, do not upload changes
+ if (info.AllowedTo == "read")
+ return;
+
+ //TODO: Check how a directory hash is calculated -> All dirs seem to have the same hash
+ if (fileInfo is DirectoryInfo)
+ {
+ //If the directory doesn't exist the Hash property will be empty
+ if (String.IsNullOrWhiteSpace(info.Hash))
+ //Go on and create the directory
+ await client.PutObject(account, cloudFile.Container, cloudFile.Name, fullFileName, String.Empty, "application/directory");
+ }
+ else
+ {
- //Even if GetObjectInfo times out, we can proceed with the upload
- var info = CloudClient.GetObjectInfo(PithosContainer, url);
+ var cloudHash = info.Hash.ToLower();
- //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;
- }
+ var hash = action.LocalHash.Value;
+ var topHash = action.TopHash.Value;
- //Mark the file as modified while we upload it
- var setStatus = Task.Factory.StartNew(() =>
- StatusKeeper.SetFileOverlayStatus(fullFileName, FileOverlayStatus.Modified));
- //And then upload it
+ //If the file hashes match, abort the upload
+ if (hash == cloudHash || topHash == cloudHash)
+ {
+ //but store any metadata changes
+ StatusKeeper.StoreInfo(fullFileName, info);
+ Log.InfoFormat("Skip upload of {0}, hashes match", fullFileName);
+ return;
+ }
- //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();
- }
- else
- {
- //Otherwise do a regular PUT
- var put = setStatus.ContinueWith(t =>
- CloudClient.PutObject(PithosContainer,url,fullFileName,hash));
- put.Wait();
+
+ //Mark the file as modified while we upload it
+ StatusKeeper.SetFileOverlayStatus(fullFileName, FileOverlayStatus.Modified);
+ //And then upload it
+
+ //Upload even small files using the Hashmap. The server may already contain
+ //the relevant block
+
+ //First, calculate the tree hash
+ var treeHash = await Signature.CalculateTreeHashAsync(fullFileName, accountInfo.BlockSize,
+ accountInfo.BlockHash);
+
+ await UploadWithHashMap(accountInfo, cloudFile, fileInfo as FileInfo, cloudFile.Name, treeHash);
+ }
+ //If everything succeeds, change the file and overlay status to normal
+ StatusKeeper.SetFileState(fullFileName, FileStatus.Unchanged, FileOverlayStatus.Normal);
}
- //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);
+ }
+ catch (AggregateException ex)
+ {
+ var exc = ex.InnerException as WebException;
+ if (exc == null)
+ throw ex.InnerException;
+ if (HandleUploadWebException(action, exc))
+ return;
+ throw;
+ }
+ catch (WebException ex)
+ {
+ if (HandleUploadWebException(action, ex))
+ return;
+ throw;
+ }
+ catch (Exception ex)
+ {
+ Log.Error("Unexpected error while uploading file", ex);
+ throw;
+ }
+
+ }
+
+ private bool IsDeletedFile(CloudAction action)
+ {
+ var key = GetFileKey(action.CloudFile);
+ DateTime entryDate;
+ if (_deletedFiles.TryGetValue(key, out entryDate))
+ {
+ //If the delete entry was created after this action, abort the action
+ if (entryDate > action.Created)
+ return true;
+ //Otherwise, remove the stale entry
+ _deletedFiles.TryRemove(key, out entryDate);
+ }
+ return false;
+ }
+
+ private bool HandleUploadWebException(CloudAction action, WebException exc)
+ {
+ var response = exc.Response as HttpWebResponse;
+ if (response == null)
+ throw exc;
+ if (response.StatusCode == HttpStatusCode.Unauthorized)
+ {
+ Log.Error("Not allowed to upload file", exc);
+ var message = String.Format("Not allowed to uplad file {0}", action.LocalFile.FullName);
+ StatusKeeper.SetFileState(action.LocalFile.FullName, FileStatus.Unchanged, FileOverlayStatus.Normal);
+ StatusNotification.NotifyChange(message, TraceLevel.Warning);
+ return true;
}
- //Notify the Shell to update the overlays
- NativeMethods.RaiseChangeNotification(fullFileName);
- StatusNotification.NotifyChangedFile(fullFileName);
+ return false;
}
- public void UploadWithHashMap(FileInfo fileInfo,string url,Task<TreeHash> treeHash)
+ public async Task UploadWithHashMap(AccountInfo accountInfo,ObjectInfo cloudFile,FileInfo fileInfo,string url,TreeHash treeHash)
{
- var fullFileName = fileInfo.FullName;
+ if (accountInfo == null)
+ throw new ArgumentNullException("accountInfo");
+ if (cloudFile==null)
+ throw new ArgumentNullException("cloudFile");
+ if (fileInfo == null)
+ throw new ArgumentNullException("fileInfo");
+ if (String.IsNullOrWhiteSpace(url))
+ throw new ArgumentNullException(url);
+ if (treeHash==null)
+ throw new ArgumentNullException("treeHash");
+ if (String.IsNullOrWhiteSpace(cloudFile.Container) )
+ throw new ArgumentException("Invalid container","cloudFile");
+ Contract.EndContractBlock();
- //Send the hashmap to the server
- var hashPut = CloudClient.PutHashMap(PithosContainer, url, treeHash.Result);
- var missingHashes = hashPut.Result;
- if (missingHashes.Count == 0)
- return;
+ var fullFileName = fileInfo.GetProperCapitalization();
+
+ var account = cloudFile.Account ?? accountInfo.UserName;
+ var container = cloudFile.Container ;
- var buffer = new byte[BlockSize];
- foreach (var missingHash in missingHashes)
+ var client = new CloudFilesClient(accountInfo);
+ //Send the hashmap to the server
+ var missingHashes = await client.PutHashMap(account, container, url, treeHash);
+ //If the server returns no missing hashes, we are done
+ while (missingHashes.Count > 0)
{
- int blockIndex = -1;
- try
+
+ var buffer = new byte[accountInfo.BlockSize];
+ foreach (var missingHash in missingHashes)
{
//Find the proper block
- blockIndex = treeHash.Result.HashDictionary[missingHash];
- var offset = blockIndex*BlockSize;
+ var blockIndex = treeHash.HashDictionary[missingHash];
+ var offset = blockIndex*accountInfo.BlockSize;
- var read = fileInfo.Read(buffer, offset, BlockSize);
- if (read > 0)
+ var read = fileInfo.Read(buffer, offset, accountInfo.BlockSize);
+
+ try
{
- //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);
+ //And upload the block
+ await client.PostBlock(account, container, buffer, 0, read);
+ Log.InfoFormat("[BLOCK] Block {0} of {1} uploaded", blockIndex, fullFileName);
}
+ catch (Exception exc)
+ {
+ Log.ErrorFormat("[ERROR] uploading block {0} of {1}\n{2}", blockIndex, fullFileName, exc);
+ }
+
}
- catch (Exception exc)
- {
- Trace.TraceError("[ERROR] uploading block {0} of {1}\n{2}", blockIndex, fullFileName, exc);
- }
- }
- UploadWithHashMap(fileInfo, url, treeHash);
-
+ //Repeat until there are no more missing hashes
+ missingHashes = await client.PutHashMap(account, container, url, treeHash);
+ }
}
+ public void AddAccount(AccountInfo accountInfo)
+ {
+ if (!_accounts.Contains(accountInfo))
+ _accounts.Add(accountInfo);
+ }
}
projects / pithos-ms-client / blobdiff