Synnefo » Pithos MS Client

using log4net;

        public IList<string> Containers { get; private set; }

        private static readonly ILog Log = LogManager.GetLogger(typeof(NetworkAgent));

            using (log4net.LogicalThreadContext.Stacks["NETWORK"].Push("PROCESS"))

            {                

                Log.InfoFormat("[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.RelativeUrlToFilePath(CloudClient.UserName));

                try

                {

                    var account = action.CloudFile.Account ?? CloudClient.UserName;

                    var container = action.CloudFile.Container ?? PithosContainer;

                    switch (action.Action)

                    {

                        case CloudActionType.UploadUnconditional:

                            UploadCloudFile(account, container, localFile, action.LocalHash.Value, action.TopHash.Value);

                            break;

                        case CloudActionType.DownloadUnconditional:

                            DownloadCloudFile(account, container, new Uri(cloudFile.Name, UriKind.Relative),

                                              downloadPath);

                            break;

                        case CloudActionType.DeleteCloud:

                            DeleteCloudFile(account, container, cloudFile.Name);

                            break;

                        case CloudActionType.RenameCloud:

                            var moveAction = (CloudMoveAction)action;

                            RenameCloudFile(account, container, moveAction.OldFileName, moveAction.NewPath,

                                            moveAction.NewFileName);

                            break;

                        case CloudActionType.MustSynch:

                            if (!File.Exists(downloadPath))

                            {

                                var cloudUri = new Uri(action.CloudFile.Name, UriKind.Relative);

                                DownloadCloudFile(account, container, cloudUri, downloadPath);

                            }

                            else

                            {

                                SyncFiles(action);

                            }

                            break;

                    }

                    Log.InfoFormat("[ACTION] End Processing {0}:{1}->{2}", action.Action, action.LocalFile,

                                           action.CloudFile.Name);

                }

                catch (OperationCanceledException)

                {

                    throw;

                }

                catch (System.IO.FileNotFoundException exc)

                {

                    Log.ErrorFormat("{0} : {1} -> {2}  failed because the file was not found.\n Rescheduling a delete",

                        action.Action, action.LocalFile, action.CloudFile, exc);

                    Post(new CloudAction(CloudActionType.DeleteCloud,action.CloudFile));

                }

                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);

                }

                return CompletedTask<object>.Default;

            }

        }

        private void SyncFiles(CloudAction action)

        {

            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 downloadPath=action.LocalFile.FullName.ToLower();

            var account = cloudFile.Account;

            //Use "pithos" by default if no container is specified

            var container = cloudFile.Container ?? PithosContainer;

            var cloudUri = new Uri(cloudFile.Name, UriKind.Relative);

            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(account, container, localFile, action.LocalHash.Value,

                                action.TopHash.Value);

            }

            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

                        DownloadCloudFile(account, container,cloudUri,downloadPath);

                    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);

                    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);

            }

        }

        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);

        }

/*

        private Task<object> Process(CloudMoveAction 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);

            try

            {

                RenameCloudFile(action.OldFileName, action.NewPath, action.NewFileName);

                                action.Action, action.OldFileName, action.NewFileName, exc);

*/

                if (cloudAction.LocalFile.Length>BlockSize)

                    cloudAction.TopHash = new Lazy<string>(() => Signature.CalculateTreeHashAsync(cloudAction.LocalFile, 

                else

                {

                    cloudAction.TopHash=new Lazy<string>(()=> cloudAction.LocalHash.Value);

                }

            using (log4net.LogicalThreadContext.Stacks["SCHEDULE"].Push("Retrieve Remote"))

            {

                Log.Info("[LISTENER] Scheduled");

                //Get the list of server objects changed since the last check

                var listObjects = Task<IList<ObjectInfo>>.Factory.StartNewDelayed(10000, () =>

                                CloudClient.ListObjects(CloudClient.UserName, PithosContainer, since));

                //Get the list of deleted objects since the last check

                var listTrash = Task<IList<ObjectInfo>>.Factory.StartNewDelayed(10000, () =>

                                CloudClient.ListObjects(CloudClient.UserName, TrashContainer, since));                

                var listShared = Task<IList<ObjectInfo>>.Factory.StartNewDelayed(10000, () =>

                                CloudClient.ListSharedObjects(since));

                var listAll = Task.Factory.TrackedSequence(

                    () => listObjects,

                    () => listTrash,

                    () => listShared);

                //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 enqueueFiles = listAll.ContinueWith(task =>

                    if (task.IsFaulted)

                    {

                        //ListObjects failed at this point, need to reschedule

                        Log.ErrorFormat("[FAIL] ListObjects in ProcessRemoteFiles with {0}", task.Exception);

                        ProcessRemoteFiles(accountPath, since);

                        return;

                    }

                    using (log4net.LogicalThreadContext.Stacks["SCHEDULE"].Push("Process Results"))

                    {

                        var remoteObjects = ((Task<IList<ObjectInfo>>) task.Result[0]).Result;

                        var trashObjects = ((Task<IList<ObjectInfo>>) task.Result[1]).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.Hash == trash.Hash)

                                        select trash;

                        ProcessDeletedFiles(realTrash);                        

                        var remote = from info in remoteObjects.Union(sharedObjects)

                                     let name = info.Name

                                     where !name.EndsWith(".ignore", StringComparison.InvariantCultureIgnoreCase) &&

                                           !name.StartsWith("fragments/", StringComparison.InvariantCultureIgnoreCase)

                                     select info;

                        //Create a list of actions from the remote files

                        var allActions = ObjectsToActions(remote);

                        //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);

                        }

                        //Report the number of new files

                        var remoteCount = distinctActions.Count(action=>

                            action.Action==CloudActionType.DownloadUnconditional);

                        if ( remoteCount > 0)

                            StatusNotification.NotifyChange(String.Format("Processing {0} new files", remoteCount));

                        Log.Info("[LISTENER] End Processing");                        

                    }

                });

                var loop = enqueueFiles.ContinueWith(t =>

                {                    

                    if (t.IsFaulted)

                        Log.Error("[LISTENER] Exception", t.Exception);

                        Log.Info("[LISTENER] Finished");

                    ProcessRemoteFiles(accountPath, nextSince);

                });

                return loop;

            }

        }

        //Creates an appropriate action for each server file

        private IEnumerable<CloudAction> ObjectsToActions(IEnumerable<ObjectInfo> remote)

        {

            if (remote==null)

                throw new ArgumentNullException();

            Contract.EndContractBlock();

            //In order to avoid multiple iterations over the files, we iterate only once

            //over the remote files

            foreach (var objectInfo in remote)

                var relativePath = objectInfo.RelativeUrlToFilePath(CloudClient.UserName);

                //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);

                    //Common files should be checked on a per-case basis to detect differences, which is newer

                    yield return new CloudAction(CloudActionType.MustSynch,

                                                   localFile, objectInfo, state, BlockSize, BlockHash);

                    //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(FileAgent.RootPath, relativePath);

                    var fileStatus = StatusKeeper.GetFileStatus(targetFile);

                    if (fileStatus != FileStatus.Deleted)

                    {

                        //Remote files should be downloaded

                        yield return new CloudAction(CloudActionType.DownloadUnconditional, objectInfo);

                    }

            }            

                var relativePath = trashObject.RelativeUrlToFilePath(CloudClient.UserName);

        private void RenameCloudFile(string account, string container,string oldFileName, string newPath, string newFileName)

            if (String.IsNullOrWhiteSpace(account))

                throw new ArgumentNullException("account");

            if (String.IsNullOrWhiteSpace(container))

                throw new ArgumentNullException("container");

            CloudClient.MoveObject(account, container, oldFileName, container, newFileName);

        private void DeleteCloudFile(string account,string container, string fileName)

        {

            if (String.IsNullOrWhiteSpace(account))

                throw new ArgumentNullException("account");

            if (String.IsNullOrWhiteSpace(container))

                throw new ArgumentNullException("container");

            if (String.IsNullOrWhiteSpace(container))

                throw new ArgumentNullException("container");

            using ( log4net.LogicalThreadContext.Stacks["DeleteCloudFile"].Push("Delete"))

            {

                var info = FileAgent.GetFileInfo(fileName);

                var path = info.FullName.ToLower();

                this.StatusKeeper.SetFileOverlayStatus(path, FileOverlayStatus.Modified);

                CloudClient.DeleteObject(account, container, fileName, TrashContainer);

                this.StatusKeeper.ClearFileStatus(path);

            }

        private void DownloadCloudFile(string account,string container, Uri relativeUrl, string localPath)

            if (String.IsNullOrWhiteSpace(account))

                throw new ArgumentNullException("account");

            var download=Task.Factory.Iterate(DownloadIterator(account,container, relativeUrl, localPath));

        private IEnumerable<Task> DownloadIterator(string account,string container, Uri relativeUrl, string localPath)

            if (String.IsNullOrWhiteSpace(account))

                throw new ArgumentNullException("account");

                var getHashMap = CloudClient.GetHashMap(account, container, url);

                    ? DownloadEntireFile(account,container, relativeUrl, localPath) 

                    : DownloadWithBlocks(account,container, relativeUrl, localPath, serverHash);

                var info=CloudClient.GetObjectInfo(account, container, url);

        private Task DownloadEntireFile(string account,string container, Uri relativeUrl, string localPath)

            if (String.IsNullOrWhiteSpace(account))

                throw new ArgumentNullException("account");

            var getObject = CloudClient.GetObject(account, container, relativeUrl.ToString(), tempPath).ContinueWith(t =>

        public Task DownloadWithBlocks(string account,string container, Uri relativeUrl, string localPath, TreeHash serverHash)

            if (String.IsNullOrWhiteSpace(account))

                throw new ArgumentNullException("account");

            return Task.Factory.Iterate(BlockDownloadIterator(account,container, relativeUrl, localPath, serverHash));

        private IEnumerable<Task> BlockDownloadIterator(string account,string container,Uri relativeUrl, string localPath,TreeHash serverHash)

            if (String.IsNullOrWhiteSpace(account))

                throw new ArgumentNullException("account");

                        Log.InfoFormat("[BLOCK GET] ORPHAN FOUND for {0} of {1} for {2}", i, upHashes.Length, localPath);

                    Log.InfoFormat("[BLOCK GET] START {0} of {1} for {2}", i, upHashes.Length, localPath);

                    var getBlock = CloudClient.GetBlock(account, container, relativeUrl, start, end);

                    Log.InfoFormat("[BLOCK GET] FINISH {0} of {1} for {2}", i, upHashes.Length, localPath);

            Log.InfoFormat("[BLOCK GET] COMPLETE {0}", localPath);            

        private void UploadCloudFile(string account,string container,FileInfo fileInfo, string hash,string topHash)

            if (String.IsNullOrWhiteSpace(account))

                throw new ArgumentNullException("account");

            if (String.IsNullOrWhiteSpace(container))

                throw new ArgumentNullException("container");

            var upload = Task.Factory.Iterate(UploadIterator(account,container,fileInfo, hash, topHash));

        private IEnumerable<Task> UploadIterator(string account,string container,FileInfo fileInfo, string hash,string topHash)

            if (String.IsNullOrWhiteSpace(account))

                throw new ArgumentNullException("account");

            if (String.IsNullOrWhiteSpace(container))

                throw new ArgumentNullException("container");

            if (fileInfo == null)

                var info = CloudClient.GetObjectInfo(account, container, url);

                    Log.InfoFormat("Skip upload of {0}, hashes match", fullFileName);

                    yield return Task.Factory.Iterate(UploadWithHashMap(account,container,fileInfo,url,treeHash));

                    yield return CloudClient.PutObject(account, container, url, fullFileName, hash);                    

        public IEnumerable<Task> UploadWithHashMap(string account,string container,FileInfo fileInfo,string url,Task<TreeHash> treeHash)

            if (String.IsNullOrWhiteSpace(account))

                throw new ArgumentNullException("account");

            if (String.IsNullOrWhiteSpace(container))

                throw new ArgumentNullException("container");

            if (fileInfo == null)

            var hashPut = CloudClient.PutHashMap(account, container, url, treeHash.Result);

                    var postBlock = CloudClient.PostBlock(account, container, buffer, 0, read);

                            exc => Log.ErrorFormat("[ERROR] uploading block {0} of {1}\n{2}", blockIndex, fullFileName, exc),

                            ()=>Log.InfoFormat("[BLOCK] Block {0} of {1} uploaded", blockIndex,fullFileName)));

                hashPut = CloudClient.PutHashMap(account, container, url, treeHash.Result);