root / trunk / Pithos.Core / Agents / NetworkAgent.cs @ 5750d7cc
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using System; |
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using System.Collections.Generic; |
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using System.ComponentModel.Composition; |
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using System.Diagnostics; |
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using System.Diagnostics.Contracts; |
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using System.IO; |
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using System.Linq; |
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using System.Net; |
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using System.Text; |
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using System.Threading; |
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using System.Threading.Tasks; |
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using Pithos.Interfaces; |
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using Pithos.Network; |
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using log4net; |
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|
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namespace Pithos.Core.Agents |
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{ |
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[Export] |
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public class NetworkAgent |
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{ |
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private Agent<CloudAction> _agent; |
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|
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[Import] |
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public IStatusKeeper StatusKeeper { get; set; } |
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|
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public IStatusNotification StatusNotification { get; set; } |
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/* |
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[Import] |
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public FileAgent FileAgent {get;set;} |
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*/ |
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|
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/* public int BlockSize { get; set; } |
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public string BlockHash { get; set; }*/ |
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|
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private static readonly ILog Log = LogManager.GetLogger("NetworkAgent"); |
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|
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private List<AccountInfo> _accounts=new List<AccountInfo>(); |
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|
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public void Start(/*int blockSize, string blockHash*/) |
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{ |
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/* |
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if (blockSize<0) |
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throw new ArgumentOutOfRangeException("blockSize"); |
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if (String.IsNullOrWhiteSpace(blockHash)) |
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throw new ArgumentOutOfRangeException("blockHash"); |
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Contract.EndContractBlock(); |
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*/ |
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|
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/* |
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BlockSize = blockSize; |
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BlockHash = blockHash; |
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*/ |
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|
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|
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_agent = Agent<CloudAction>.Start(inbox => |
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{ |
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Action loop = null; |
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loop = () => |
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{ |
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var message = inbox.Receive(); |
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var process=message.Then(Process,inbox.CancellationToken); |
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inbox.LoopAsync(process, loop); |
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}; |
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loop(); |
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}); |
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} |
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|
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private Task<object> Process(CloudAction action) |
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{ |
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if (action == null) |
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throw new ArgumentNullException("action"); |
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if (action.AccountInfo==null) |
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throw new ArgumentException("The action.AccountInfo is empty","action"); |
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Contract.EndContractBlock(); |
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|
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var accountInfo = action.AccountInfo; |
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|
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using (log4net.ThreadContext.Stacks["NETWORK"].Push("PROCESS")) |
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{ |
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Log.InfoFormat("[ACTION] Start Processing {0}:{1}->{2}", action.Action, action.LocalFile, |
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action.CloudFile.Name); |
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|
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var localFile = action.LocalFile; |
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var cloudFile = action.CloudFile; |
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var downloadPath = action.GetDownloadPath(); |
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|
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try |
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{ |
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|
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switch (action.Action) |
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{ |
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case CloudActionType.UploadUnconditional: |
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UploadCloudFile(action); |
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break; |
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case CloudActionType.DownloadUnconditional: |
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|
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DownloadCloudFile(accountInfo, cloudFile,downloadPath); |
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break; |
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case CloudActionType.DeleteCloud: |
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DeleteCloudFile(accountInfo, cloudFile, cloudFile.Name); |
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break; |
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case CloudActionType.RenameCloud: |
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var moveAction = (CloudMoveAction)action; |
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RenameCloudFile(accountInfo, cloudFile, moveAction); |
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break; |
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case CloudActionType.MustSynch: |
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|
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if (!File.Exists(downloadPath)) |
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{ |
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DownloadCloudFile(accountInfo, cloudFile, downloadPath); |
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} |
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else |
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{ |
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SyncFiles(accountInfo, action); |
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} |
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break; |
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} |
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Log.InfoFormat("[ACTION] End Processing {0}:{1}->{2}", action.Action, action.LocalFile, |
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action.CloudFile.Name); |
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} |
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catch (OperationCanceledException) |
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{ |
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throw; |
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} |
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catch (FileNotFoundException exc) |
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{ |
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Log.ErrorFormat("{0} : {1} -> {2} failed because the file was not found.\n Rescheduling a delete", |
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action.Action, action.LocalFile, action.CloudFile, exc); |
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//Post a delete action for the missing file |
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Post(new CloudDeleteAction(action)); |
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} |
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catch (Exception exc) |
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{ |
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Log.ErrorFormat("[REQUEUE] {0} : {1} -> {2} due to exception\r\n{3}", |
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action.Action, action.LocalFile, action.CloudFile, exc); |
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|
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_agent.Post(action); |
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} |
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return CompletedTask<object>.Default; |
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} |
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} |
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|
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private void SyncFiles(AccountInfo accountInfo,CloudAction action) |
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{ |
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if (accountInfo == null) |
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throw new ArgumentNullException("accountInfo"); |
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if (action==null) |
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throw new ArgumentNullException("action"); |
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if (action.LocalFile==null) |
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throw new ArgumentException("The action's local file is not specified","action"); |
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if (!Path.IsPathRooted(action.LocalFile.FullName)) |
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throw new ArgumentException("The action's local file path must be absolute","action"); |
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if (action.CloudFile== null) |
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throw new ArgumentException("The action's cloud file is not specified", "action"); |
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Contract.EndContractBlock(); |
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|
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var localFile = action.LocalFile; |
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var cloudFile = action.CloudFile; |
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var downloadPath=action.LocalFile.FullName.ToLower(); |
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|
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var cloudHash = cloudFile.Hash.ToLower(); |
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var localHash = action.LocalHash.Value.ToLower(); |
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var topHash = action.TopHash.Value.ToLower(); |
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|
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//Not enough to compare only the local hashes, also have to compare the tophashes |
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|
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//If any of the hashes match, we are done |
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if ((cloudHash == localHash || cloudHash == topHash)) |
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{ |
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Log.InfoFormat("Skipping {0}, hashes match",downloadPath); |
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return; |
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} |
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|
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//The hashes DON'T match. We need to sync |
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var lastLocalTime = localFile.LastWriteTime; |
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var lastUpTime = cloudFile.Last_Modified; |
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|
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//If the local file is newer upload it |
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if (lastUpTime <= lastLocalTime) |
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{ |
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//It probably means it was changed while the app was down |
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UploadCloudFile(action); |
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} |
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else |
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{ |
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//It the cloud file has a later date, it was modified by another user or computer. |
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//We need to check the local file's status |
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var status = StatusKeeper.GetFileStatus(downloadPath); |
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switch (status) |
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{ |
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case FileStatus.Unchanged: |
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//If the local file's status is Unchanged, we can go on and download the newer cloud file |
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DownloadCloudFile(accountInfo,cloudFile,downloadPath); |
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break; |
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case FileStatus.Modified: |
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//If the local file is Modified, we may have a conflict. In this case we should mark the file as Conflict |
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//We can't ensure that a file modified online since the last time will appear as Modified, unless we |
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//index all files before we start listening. |
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case FileStatus.Created: |
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//If the local file is Created, it means that the local and cloud files aren't related, |
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// yet they have the same name. |
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|
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//In both cases we must mark the file as in conflict |
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ReportConflict(downloadPath); |
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break; |
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default: |
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//Other cases should never occur. Mark them as Conflict as well but log a warning |
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ReportConflict(downloadPath); |
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Log.WarnFormat("Unexcepted status {0} for file {1}->{2}", status, |
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downloadPath, action.CloudFile.Name); |
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break; |
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} |
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} |
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} |
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|
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private void ReportConflict(string downloadPath) |
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{ |
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if (String.IsNullOrWhiteSpace(downloadPath)) |
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throw new ArgumentNullException("downloadPath"); |
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Contract.EndContractBlock(); |
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|
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StatusKeeper.SetFileOverlayStatus(downloadPath, FileOverlayStatus.Conflict); |
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var message = String.Format("Conflict detected for file {0}", downloadPath); |
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Log.Warn(message); |
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StatusNotification.NotifyChange(message, TraceLevel.Warning); |
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} |
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|
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public void Post(CloudAction cloudAction) |
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{ |
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if (cloudAction == null) |
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throw new ArgumentNullException("cloudAction"); |
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if (cloudAction.AccountInfo==null) |
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throw new ArgumentException("The CloudAction.AccountInfo is empty","cloudAction"); |
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Contract.EndContractBlock(); |
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|
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//If the action targets a local file, add a treehash calculation |
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if (cloudAction.LocalFile != null) |
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{ |
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var accountInfo = cloudAction.AccountInfo; |
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if (cloudAction.LocalFile.Length>accountInfo.BlockSize) |
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cloudAction.TopHash = new Lazy<string>(() => Signature.CalculateTreeHashAsync(cloudAction.LocalFile, |
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accountInfo.BlockSize, accountInfo.BlockHash).Result |
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.TopHash.ToHashString()); |
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else |
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{ |
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cloudAction.TopHash=new Lazy<string>(()=> cloudAction.LocalHash.Value); |
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} |
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|
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} |
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_agent.Post(cloudAction); |
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} |
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|
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class ObjectInfoByNameComparer:IEqualityComparer<ObjectInfo> |
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{ |
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public bool Equals(ObjectInfo x, ObjectInfo y) |
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{ |
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return x.Name.Equals(y.Name,StringComparison.InvariantCultureIgnoreCase); |
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} |
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|
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public int GetHashCode(ObjectInfo obj) |
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{ |
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return obj.Name.ToLower().GetHashCode(); |
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} |
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} |
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|
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|
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|
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//Remote files are polled periodically. Any changes are processed |
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public Task ProcessRemoteFiles(DateTime? since=null) |
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{ |
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return Task<Task>.Factory.StartNewDelayed(10000, () => |
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{ |
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using (log4net.ThreadContext.Stacks["Retrieve Remote"].Push("All accounts")) |
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{ |
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//Next time we will check for all changes since the current check minus 1 second |
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//This is done to ensure there are no discrepancies due to clock differences |
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DateTime nextSince = DateTime.Now.AddSeconds(-1); |
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|
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var tasks=from accountInfo in _accounts |
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select ProcessAccountFiles(accountInfo, since); |
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var process=Task.Factory.Iterate(tasks); |
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|
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return process.ContinueWith(t => |
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{ |
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if (t.IsFaulted) |
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{ |
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Log.Error("Error while processing accounts"); |
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t.Exception.Handle(exc=> |
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{ |
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Log.Error("Details:", exc); |
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return true; |
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}); |
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} |
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ProcessRemoteFiles(nextSince); |
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}); |
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} |
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}); |
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} |
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|
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public Task ProcessAccountFiles(AccountInfo accountInfo,DateTime? since=null) |
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{ |
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if (accountInfo==null) |
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throw new ArgumentNullException("accountInfo"); |
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if (String.IsNullOrWhiteSpace(accountInfo.AccountPath)) |
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throw new ArgumentException("The AccountInfo.AccountPath is empty","accountInfo"); |
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Contract.EndContractBlock(); |
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|
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using (log4net.ThreadContext.Stacks["Retrieve Remote"].Push(accountInfo.UserName)) |
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{ |
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Log.Info("Scheduled"); |
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var client=new CloudFilesClient(accountInfo); |
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|
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var containers = client.ListContainers(accountInfo.UserName); |
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|
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CreateContainerFolders(accountInfo, containers); |
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|
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|
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//Get the list of server objects changed since the last check |
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var listObjects = Task<IList<ObjectInfo>>.Factory.StartNew(() => |
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client.ListObjects(accountInfo.UserName, FolderConstants.PithosContainer, since)); |
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//Get the list of deleted objects since the last check |
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var listTrash = Task<IList<ObjectInfo>>.Factory.StartNew(() => |
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client.ListObjects(accountInfo.UserName, FolderConstants.TrashContainer, since)); |
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|
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var listShared = Task<IList<ObjectInfo>>.Factory.StartNew(() => |
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client.ListSharedObjects(since)); |
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|
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var listAll = Task.Factory.TrackedSequence( |
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() => listObjects, |
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() => listTrash, |
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() => listShared); |
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|
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|
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|
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var enqueueFiles = listAll.ContinueWith(task => |
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{ |
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if (task.IsFaulted) |
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{ |
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//ListObjects failed at this point, need to reschedule |
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Log.ErrorFormat("[FAIL] ListObjects for{0} in ProcessRemoteFiles with {0}", accountInfo.UserName,task.Exception); |
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return; |
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} |
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using (log4net.ThreadContext.Stacks["SCHEDULE"].Push("Process Results")) |
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{ |
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var remoteObjects = ((Task<IList<ObjectInfo>>) task.Result[0]).Result; |
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var trashObjects = ((Task<IList<ObjectInfo>>) task.Result[1]).Result; |
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var sharedObjects = ((Task<IList<ObjectInfo>>) task.Result[2]).Result; |
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|
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//Items with the same name, hash may be both in the container and the trash |
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//Don't delete items that exist in the container |
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var realTrash = from trash in trashObjects |
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where !remoteObjects.Any(info => info.Hash == trash.Hash) |
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select trash; |
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ProcessDeletedFiles(accountInfo,realTrash); |
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|
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|
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var remote = from info in remoteObjects.Union(sharedObjects) |
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let name = info.Name |
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where !name.EndsWith(".ignore", StringComparison.InvariantCultureIgnoreCase) && |
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!name.StartsWith(FolderConstants.CacheFolder +"/", StringComparison.InvariantCultureIgnoreCase) |
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select info; |
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|
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//Create a list of actions from the remote files |
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var allActions = ObjectsToActions(accountInfo,remote); |
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|
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//And remove those that are already being processed by the agent |
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var distinctActions = allActions |
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.Except(_agent.GetEnumerable(), new PithosMonitor.LocalFileComparer()) |
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.ToList(); |
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|
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//Queue all the actions |
372 |
foreach (var message in distinctActions) |
373 |
{ |
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Post(message); |
375 |
} |
376 |
|
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//Report the number of new files |
378 |
var remoteCount = distinctActions.Count(action=> |
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action.Action==CloudActionType.DownloadUnconditional); |
380 |
/* |
381 |
if ( remoteCount > 0) |
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StatusNotification.NotifyChange(String.Format("Processing {0} new files", remoteCount)); |
383 |
*/ |
384 |
|
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Log.Info("[LISTENER] End Processing"); |
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} |
387 |
}); |
388 |
|
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var log = enqueueFiles.ContinueWith(t => |
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{ |
391 |
if (t.IsFaulted) |
392 |
{ |
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Log.Error("[LISTENER] Exception", t.Exception); |
394 |
} |
395 |
else |
396 |
{ |
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Log.Info("[LISTENER] Finished"); |
398 |
} |
399 |
}); |
400 |
return log; |
401 |
} |
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} |
403 |
|
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private static void CreateContainerFolders(AccountInfo accountInfo, IList<ContainerInfo> containers) |
405 |
{ |
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var containerPaths = from container in containers |
407 |
let containerPath = Path.Combine(accountInfo.AccountPath, container.Name) |
408 |
where container.Name != FolderConstants.TrashContainer && !Directory.Exists(containerPath) |
409 |
select containerPath; |
410 |
|
411 |
foreach (var path in containerPaths) |
412 |
{ |
413 |
Directory.CreateDirectory(path); |
414 |
} |
415 |
} |
416 |
|
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//Creates an appropriate action for each server file |
418 |
private IEnumerable<CloudAction> ObjectsToActions(AccountInfo accountInfo,IEnumerable<ObjectInfo> remote) |
419 |
{ |
420 |
if (remote==null) |
421 |
throw new ArgumentNullException(); |
422 |
Contract.EndContractBlock(); |
423 |
var fileAgent = GetFileAgent(accountInfo); |
424 |
|
425 |
//In order to avoid multiple iterations over the files, we iterate only once |
426 |
//over the remote files |
427 |
foreach (var objectInfo in remote) |
428 |
{ |
429 |
var relativePath = objectInfo.RelativeUrlToFilePath(accountInfo.UserName); |
430 |
//and remove any matching objects from the list, adding them to the commonObjects list |
431 |
|
432 |
if (fileAgent.Exists(relativePath)) |
433 |
{ |
434 |
var localFile = fileAgent.GetFileInfo(relativePath); |
435 |
var state = FileState.FindByFilePath(localFile.FullName); |
436 |
//Common files should be checked on a per-case basis to detect differences, which is newer |
437 |
|
438 |
yield return new CloudAction(accountInfo,CloudActionType.MustSynch, |
439 |
localFile, objectInfo, state, accountInfo.BlockSize, |
440 |
accountInfo.BlockHash); |
441 |
} |
442 |
else |
443 |
{ |
444 |
//If there is no match we add them to the localFiles list |
445 |
//but only if the file is not marked for deletion |
446 |
var targetFile = Path.Combine(accountInfo.AccountPath, relativePath); |
447 |
var fileStatus = StatusKeeper.GetFileStatus(targetFile); |
448 |
if (fileStatus != FileStatus.Deleted) |
449 |
{ |
450 |
//Remote files should be downloaded |
451 |
yield return new CloudDownloadAction(accountInfo,objectInfo); |
452 |
} |
453 |
} |
454 |
} |
455 |
} |
456 |
|
457 |
private static FileAgent GetFileAgent(AccountInfo accountInfo) |
458 |
{ |
459 |
return AgentLocator<FileAgent>.Get(accountInfo.AccountPath); |
460 |
} |
461 |
|
462 |
private void ProcessDeletedFiles(AccountInfo accountInfo,IEnumerable<ObjectInfo> trashObjects) |
463 |
{ |
464 |
var fileAgent = GetFileAgent(accountInfo); |
465 |
foreach (var trashObject in trashObjects) |
466 |
{ |
467 |
var relativePath = trashObject.RelativeUrlToFilePath(accountInfo.UserName); |
468 |
//and remove any matching objects from the list, adding them to the commonObjects list |
469 |
fileAgent.Delete(relativePath); |
470 |
} |
471 |
} |
472 |
|
473 |
|
474 |
private void RenameCloudFile(AccountInfo accountInfo,ObjectInfo cloudFile,CloudMoveAction action) |
475 |
{ |
476 |
if (accountInfo==null) |
477 |
throw new ArgumentNullException("accountInfo"); |
478 |
if (cloudFile==null) |
479 |
throw new ArgumentNullException("cloudFile"); |
480 |
if (action==null) |
481 |
throw new ArgumentNullException("action"); |
482 |
Contract.EndContractBlock(); |
483 |
//The local file is already renamed |
484 |
this.StatusKeeper.SetFileOverlayStatus(action.NewPath, FileOverlayStatus.Modified); |
485 |
|
486 |
|
487 |
var account = action.CloudFile.Account ?? accountInfo.UserName; |
488 |
var container = action.CloudFile.Container ?? FolderConstants.PithosContainer; |
489 |
|
490 |
var client = new CloudFilesClient(accountInfo); |
491 |
client.MoveObject(account, container, action.OldFileName, container, action.NewFileName); |
492 |
|
493 |
this.StatusKeeper.SetFileStatus(action.NewPath, FileStatus.Unchanged); |
494 |
this.StatusKeeper.SetFileOverlayStatus(action.NewPath, FileOverlayStatus.Normal); |
495 |
NativeMethods.RaiseChangeNotification(action.NewPath); |
496 |
} |
497 |
|
498 |
private void DeleteCloudFile(AccountInfo accountInfo, ObjectInfo cloudFile,string fileName) |
499 |
{ |
500 |
if (accountInfo == null) |
501 |
throw new ArgumentNullException("accountInfo"); |
502 |
if (cloudFile==null) |
503 |
throw new ArgumentNullException("cloudFile"); |
504 |
|
505 |
if (String.IsNullOrWhiteSpace(fileName)) |
506 |
throw new ArgumentNullException("fileName"); |
507 |
if (Path.IsPathRooted(fileName)) |
508 |
throw new ArgumentException("The fileName should not be rooted","fileName"); |
509 |
Contract.EndContractBlock(); |
510 |
|
511 |
var fileAgent = GetFileAgent(accountInfo); |
512 |
|
513 |
using ( log4net.ThreadContext.Stacks["DeleteCloudFile"].Push("Delete")) |
514 |
{ |
515 |
var info = fileAgent.GetFileInfo(fileName); |
516 |
var fullPath = info.FullName.ToLower(); |
517 |
this.StatusKeeper.SetFileOverlayStatus(fullPath, FileOverlayStatus.Modified); |
518 |
|
519 |
var account = cloudFile.Account ?? accountInfo.UserName; |
520 |
var container = cloudFile.Container ?? FolderConstants.PithosContainer; |
521 |
|
522 |
var client = new CloudFilesClient(accountInfo); |
523 |
client.DeleteObject(account, container, fileName); |
524 |
|
525 |
this.StatusKeeper.ClearFileStatus(fullPath); |
526 |
} |
527 |
} |
528 |
|
529 |
//Download a file. |
530 |
private void DownloadCloudFile(AccountInfo accountInfo, ObjectInfo cloudFile , string localPath) |
531 |
{ |
532 |
if (accountInfo == null) |
533 |
throw new ArgumentNullException("accountInfo"); |
534 |
if (cloudFile == null) |
535 |
throw new ArgumentNullException("cloudFile"); |
536 |
if (String.IsNullOrWhiteSpace(cloudFile.Account)) |
537 |
throw new ArgumentNullException("cloudFile"); |
538 |
if (String.IsNullOrWhiteSpace(cloudFile.Container)) |
539 |
throw new ArgumentNullException("cloudFile"); |
540 |
if (String.IsNullOrWhiteSpace(localPath)) |
541 |
throw new ArgumentNullException("localPath"); |
542 |
if (!Path.IsPathRooted(localPath)) |
543 |
throw new ArgumentException("The localPath must be rooted", "localPath"); |
544 |
Contract.EndContractBlock(); |
545 |
|
546 |
var download=Task.Factory.Iterate(DownloadIterator(accountInfo,cloudFile, localPath)); |
547 |
download.Wait(); |
548 |
} |
549 |
|
550 |
private IEnumerable<Task> DownloadIterator(AccountInfo accountInfo,ObjectInfo cloudFile, string localPath) |
551 |
{ |
552 |
if (accountInfo == null) |
553 |
throw new ArgumentNullException("accountInfo"); |
554 |
if (cloudFile == null) |
555 |
throw new ArgumentNullException("cloudFile"); |
556 |
if (String.IsNullOrWhiteSpace(cloudFile.Account)) |
557 |
throw new ArgumentNullException("cloudFile"); |
558 |
if (String.IsNullOrWhiteSpace(cloudFile.Container)) |
559 |
throw new ArgumentNullException("cloudFile"); |
560 |
if (String.IsNullOrWhiteSpace(localPath)) |
561 |
throw new ArgumentNullException("localPath"); |
562 |
if (!Path.IsPathRooted(localPath)) |
563 |
throw new ArgumentException("The localPath must be rooted", "localPath"); |
564 |
Contract.EndContractBlock(); |
565 |
|
566 |
Uri relativeUrl = new Uri(cloudFile.Name, UriKind.Relative); |
567 |
|
568 |
var url = relativeUrl.ToString(); |
569 |
if (cloudFile.Name.EndsWith(".ignore", StringComparison.InvariantCultureIgnoreCase)) |
570 |
yield break; |
571 |
|
572 |
//Are we already downloading or uploading the file? |
573 |
using (var gate=NetworkGate.Acquire(localPath, NetworkOperation.Downloading)) |
574 |
{ |
575 |
if (gate.Failed) |
576 |
yield break; |
577 |
//The file's hashmap will be stored in the same location with the extension .hashmap |
578 |
//var hashPath = Path.Combine(FileAgent.CachePath, relativePath + ".hashmap"); |
579 |
|
580 |
var client = new CloudFilesClient(accountInfo); |
581 |
var account = cloudFile.Account; |
582 |
var container = cloudFile.Container; |
583 |
|
584 |
//Retrieve the hashmap from the server |
585 |
var getHashMap = client.GetHashMap(account, container, url); |
586 |
yield return getHashMap; |
587 |
|
588 |
var serverHash=getHashMap.Result; |
589 |
//If it's a small file |
590 |
var downloadTask=(serverHash.Hashes.Count == 1 ) |
591 |
//Download it in one go |
592 |
? DownloadEntireFile(accountInfo,client, cloudFile, relativeUrl, localPath, serverHash) |
593 |
//Otherwise download it block by block |
594 |
: DownloadWithBlocks(accountInfo,client, cloudFile, relativeUrl, localPath, serverHash); |
595 |
|
596 |
yield return downloadTask; |
597 |
|
598 |
if (cloudFile.AllowedTo == "read") |
599 |
{ |
600 |
var attributes=File.GetAttributes(localPath); |
601 |
File.SetAttributes(localPath,attributes|FileAttributes.ReadOnly); |
602 |
} |
603 |
|
604 |
//Now we can store the object's metadata without worrying about ghost status entries |
605 |
StatusKeeper.StoreInfo(localPath, cloudFile); |
606 |
|
607 |
} |
608 |
} |
609 |
|
610 |
//Download a small file with a single GET operation |
611 |
private Task DownloadEntireFile(AccountInfo accountInfo, CloudFilesClient client, ObjectInfo cloudFile, Uri relativeUrl, string localPath,TreeHash serverHash) |
612 |
{ |
613 |
if (client == null) |
614 |
throw new ArgumentNullException("client"); |
615 |
if (cloudFile==null) |
616 |
throw new ArgumentNullException("cloudFile"); |
617 |
if (relativeUrl == null) |
618 |
throw new ArgumentNullException("relativeUrl"); |
619 |
if (String.IsNullOrWhiteSpace(localPath)) |
620 |
throw new ArgumentNullException("localPath"); |
621 |
if (!Path.IsPathRooted(localPath)) |
622 |
throw new ArgumentException("The localPath must be rooted", "localPath"); |
623 |
Contract.EndContractBlock(); |
624 |
|
625 |
//If the file already exists |
626 |
if (File.Exists(localPath)) |
627 |
{ |
628 |
//First check with MD5 as this is a small file |
629 |
var localMD5 = Signature.CalculateMD5(localPath); |
630 |
var cloudHash=serverHash.TopHash.ToHashString(); |
631 |
if (localMD5==cloudHash) |
632 |
return CompletedTask.Default; |
633 |
//Then check with a treehash |
634 |
var localTreeHash = Signature.CalculateTreeHash(localPath, serverHash.BlockSize, serverHash.BlockHash); |
635 |
var localHash = localTreeHash.TopHash.ToHashString(); |
636 |
if (localHash==cloudHash) |
637 |
return CompletedTask.Default; |
638 |
} |
639 |
|
640 |
var fileAgent = GetFileAgent(accountInfo); |
641 |
//Calculate the relative file path for the new file |
642 |
var relativePath = relativeUrl.RelativeUriToFilePath(); |
643 |
//The file will be stored in a temporary location while downloading with an extension .download |
644 |
var tempPath = Path.Combine(fileAgent.CachePath, relativePath + ".download"); |
645 |
//Make sure the target folder exists. DownloadFileTask will not create the folder |
646 |
var tempFolder = Path.GetDirectoryName(tempPath); |
647 |
if (!Directory.Exists(tempFolder)) |
648 |
Directory.CreateDirectory(tempFolder); |
649 |
|
650 |
//Download the object to the temporary location |
651 |
var getObject = client.GetObject(cloudFile.Account, cloudFile.Container, relativeUrl.ToString(), tempPath).ContinueWith(t => |
652 |
{ |
653 |
t.PropagateExceptions(); |
654 |
//Create the local folder if it doesn't exist (necessary for shared objects) |
655 |
var localFolder = Path.GetDirectoryName(localPath); |
656 |
if (!Directory.Exists(localFolder)) |
657 |
Directory.CreateDirectory(localFolder); |
658 |
//And move it to its actual location once downloading is finished |
659 |
if (File.Exists(localPath)) |
660 |
File.Replace(tempPath,localPath,null,true); |
661 |
else |
662 |
File.Move(tempPath,localPath); |
663 |
//Notify listeners that a local file has changed |
664 |
StatusNotification.NotifyChangedFile(localPath); |
665 |
|
666 |
}); |
667 |
return getObject; |
668 |
} |
669 |
|
670 |
//Download a file asynchronously using blocks |
671 |
public Task DownloadWithBlocks(AccountInfo accountInfo, CloudFilesClient client, ObjectInfo cloudFile, Uri relativeUrl, string localPath, TreeHash serverHash) |
672 |
{ |
673 |
if (client == null) |
674 |
throw new ArgumentNullException("client"); |
675 |
if (cloudFile == null) |
676 |
throw new ArgumentNullException("cloudFile"); |
677 |
if (relativeUrl == null) |
678 |
throw new ArgumentNullException("relativeUrl"); |
679 |
if (String.IsNullOrWhiteSpace(localPath)) |
680 |
throw new ArgumentNullException("localPath"); |
681 |
if (!Path.IsPathRooted(localPath)) |
682 |
throw new ArgumentException("The localPath must be rooted", "localPath"); |
683 |
if (serverHash == null) |
684 |
throw new ArgumentNullException("serverHash"); |
685 |
Contract.EndContractBlock(); |
686 |
|
687 |
return Task.Factory.Iterate(BlockDownloadIterator(accountInfo,client,cloudFile, relativeUrl, localPath, serverHash)); |
688 |
} |
689 |
|
690 |
private IEnumerable<Task> BlockDownloadIterator(AccountInfo accountInfo,CloudFilesClient client, ObjectInfo cloudFile, Uri relativeUrl, string localPath, TreeHash serverHash) |
691 |
{ |
692 |
if (client == null) |
693 |
throw new ArgumentNullException("client"); |
694 |
if (cloudFile==null) |
695 |
throw new ArgumentNullException("cloudFile"); |
696 |
if (relativeUrl == null) |
697 |
throw new ArgumentNullException("relativeUrl"); |
698 |
if (String.IsNullOrWhiteSpace(localPath)) |
699 |
throw new ArgumentNullException("localPath"); |
700 |
if (!Path.IsPathRooted(localPath)) |
701 |
throw new ArgumentException("The localPath must be rooted", "localPath"); |
702 |
if(serverHash==null) |
703 |
throw new ArgumentNullException("serverHash"); |
704 |
Contract.EndContractBlock(); |
705 |
|
706 |
var fileAgent = GetFileAgent(accountInfo); |
707 |
|
708 |
//Calculate the relative file path for the new file |
709 |
var relativePath = relativeUrl.RelativeUriToFilePath(); |
710 |
var blockUpdater = new BlockUpdater(fileAgent.CachePath, localPath, relativePath, serverHash); |
711 |
|
712 |
|
713 |
|
714 |
//Calculate the file's treehash |
715 |
var calcHash = Signature.CalculateTreeHashAsync(localPath, serverHash.BlockSize,serverHash.BlockHash); |
716 |
yield return calcHash; |
717 |
var treeHash = calcHash.Result; |
718 |
|
719 |
//And compare it with the server's hash |
720 |
var upHashes = serverHash.GetHashesAsStrings(); |
721 |
var localHashes = treeHash.HashDictionary; |
722 |
for (int i = 0; i < upHashes.Length; i++) |
723 |
{ |
724 |
//For every non-matching hash |
725 |
var upHash = upHashes[i]; |
726 |
if (!localHashes.ContainsKey(upHash)) |
727 |
{ |
728 |
if (blockUpdater.UseOrphan(i, upHash)) |
729 |
{ |
730 |
Log.InfoFormat("[BLOCK GET] ORPHAN FOUND for {0} of {1} for {2}", i, upHashes.Length, localPath); |
731 |
continue; |
732 |
} |
733 |
Log.InfoFormat("[BLOCK GET] START {0} of {1} for {2}", i, upHashes.Length, localPath); |
734 |
var start = i*serverHash.BlockSize; |
735 |
//To download the last block just pass a null for the end of the range |
736 |
long? end = null; |
737 |
if (i < upHashes.Length - 1 ) |
738 |
end= ((i + 1)*serverHash.BlockSize) ; |
739 |
|
740 |
//Download the missing block |
741 |
var getBlock = client.GetBlock(cloudFile.Account, cloudFile.Container, relativeUrl, start, end); |
742 |
yield return getBlock; |
743 |
var block = getBlock.Result; |
744 |
|
745 |
//and store it |
746 |
yield return blockUpdater.StoreBlock(i, block); |
747 |
|
748 |
|
749 |
Log.InfoFormat("[BLOCK GET] FINISH {0} of {1} for {2}", i, upHashes.Length, localPath); |
750 |
} |
751 |
} |
752 |
|
753 |
//Want to avoid notifications if no changes were made |
754 |
var hasChanges = blockUpdater.HasBlocks; |
755 |
blockUpdater.Commit(); |
756 |
|
757 |
if (hasChanges) |
758 |
//Notify listeners that a local file has changed |
759 |
StatusNotification.NotifyChangedFile(localPath); |
760 |
|
761 |
Log.InfoFormat("[BLOCK GET] COMPLETE {0}", localPath); |
762 |
} |
763 |
|
764 |
|
765 |
private void UploadCloudFile(CloudAction action) |
766 |
{ |
767 |
if (action == null) |
768 |
throw new ArgumentNullException("action"); |
769 |
Contract.EndContractBlock(); |
770 |
|
771 |
try |
772 |
{ |
773 |
var upload = Task.Factory.Iterate(UploadIterator(action)); |
774 |
upload.Wait(); |
775 |
} |
776 |
catch (AggregateException ex) |
777 |
{ |
778 |
var exc = ex.InnerException as WebException; |
779 |
if (exc==null) |
780 |
throw ex.InnerException; |
781 |
var response = exc.Response as HttpWebResponse; |
782 |
if (response==null) |
783 |
throw exc; |
784 |
if (response.StatusCode == HttpStatusCode.Unauthorized) |
785 |
{ |
786 |
Log.Error("Not allowed to upload file", exc); |
787 |
var message = String.Format("Not allowed to uplad file {0}",action.LocalFile.FullName); |
788 |
StatusKeeper.SetFileState(action.LocalFile.FullName,FileStatus.Unchanged,FileOverlayStatus.Normal); |
789 |
StatusNotification.NotifyChange(message,TraceLevel.Warning); |
790 |
return; |
791 |
} |
792 |
throw; |
793 |
} |
794 |
} |
795 |
|
796 |
private IEnumerable<Task> UploadIterator(CloudAction action) |
797 |
{ |
798 |
if (action == null) |
799 |
throw new ArgumentNullException("action"); |
800 |
Contract.EndContractBlock(); |
801 |
|
802 |
var accountInfo=action.AccountInfo; |
803 |
|
804 |
var fileInfo=action.LocalFile; |
805 |
|
806 |
if (fileInfo.Extension.Equals("ignore", StringComparison.InvariantCultureIgnoreCase)) |
807 |
yield break; |
808 |
|
809 |
var relativePath = fileInfo.AsRelativeTo(accountInfo.AccountPath); |
810 |
if (relativePath.StartsWith(FolderConstants.OthersFolder)) |
811 |
{ |
812 |
var parts=relativePath.Split('\\'); |
813 |
var accountName = parts[1]; |
814 |
var oldName = accountInfo.UserName; |
815 |
var absoluteUri = accountInfo.StorageUri.AbsoluteUri; |
816 |
var nameIndex=absoluteUri.IndexOf(oldName); |
817 |
var root=absoluteUri.Substring(0, nameIndex); |
818 |
|
819 |
accountInfo = new AccountInfo |
820 |
{ |
821 |
UserName = accountName, |
822 |
AccountPath = Path.Combine(accountInfo.AccountPath, parts[0], parts[1]), |
823 |
StorageUri = new Uri(root + accountName), |
824 |
BlockHash=accountInfo.BlockHash, |
825 |
BlockSize=accountInfo.BlockSize, |
826 |
Token=accountInfo.Token |
827 |
}; |
828 |
} |
829 |
|
830 |
|
831 |
var url = fileInfo.AsRelativeUrlTo(accountInfo.AccountPath); |
832 |
|
833 |
|
834 |
|
835 |
var fullFileName = fileInfo.FullName; |
836 |
using(var gate=NetworkGate.Acquire(fullFileName,NetworkOperation.Uploading)) |
837 |
{ |
838 |
//Abort if the file is already being uploaded or downloaded |
839 |
if (gate.Failed) |
840 |
yield break; |
841 |
|
842 |
var cloudFile = action.CloudFile; |
843 |
var account = cloudFile.Account ?? accountInfo.UserName; |
844 |
var container = cloudFile.Container ?? FolderConstants.PithosContainer; |
845 |
|
846 |
var client = new CloudFilesClient(accountInfo); |
847 |
//Even if GetObjectInfo times out, we can proceed with the upload |
848 |
var info = client.GetObjectInfo(account, container, url); |
849 |
var cloudHash = info.Hash.ToLower(); |
850 |
|
851 |
var hash = action.LocalHash.Value; |
852 |
var topHash = action.TopHash.Value; |
853 |
|
854 |
//If the file hashes match, abort the upload |
855 |
if (hash == cloudHash || topHash ==cloudHash) |
856 |
{ |
857 |
//but store any metadata changes |
858 |
this.StatusKeeper.StoreInfo(fullFileName, info); |
859 |
Log.InfoFormat("Skip upload of {0}, hashes match", fullFileName); |
860 |
yield break; |
861 |
} |
862 |
|
863 |
if (info.AllowedTo=="read") |
864 |
yield break; |
865 |
|
866 |
//Mark the file as modified while we upload it |
867 |
StatusKeeper.SetFileOverlayStatus(fullFileName, FileOverlayStatus.Modified); |
868 |
//And then upload it |
869 |
|
870 |
//Upload even small files using the Hashmap. The server may already containt |
871 |
//the relevant folder |
872 |
|
873 |
//First, calculate the tree hash |
874 |
var treeHash = Signature.CalculateTreeHashAsync(fileInfo.FullName, accountInfo.BlockSize, |
875 |
accountInfo.BlockHash); |
876 |
yield return treeHash; |
877 |
|
878 |
yield return Task.Factory.Iterate(UploadWithHashMap(accountInfo,cloudFile,fileInfo,url,treeHash)); |
879 |
|
880 |
//If everything succeeds, change the file and overlay status to normal |
881 |
this.StatusKeeper.SetFileState(fullFileName, FileStatus.Unchanged, FileOverlayStatus.Normal); |
882 |
} |
883 |
//Notify the Shell to update the overlays |
884 |
NativeMethods.RaiseChangeNotification(fullFileName); |
885 |
StatusNotification.NotifyChangedFile(fullFileName); |
886 |
} |
887 |
|
888 |
public IEnumerable<Task> UploadWithHashMap(AccountInfo accountInfo,ObjectInfo cloudFile,FileInfo fileInfo,string url,Task<TreeHash> treeHash) |
889 |
{ |
890 |
if (accountInfo == null) |
891 |
throw new ArgumentNullException("accountInfo"); |
892 |
if (cloudFile==null) |
893 |
throw new ArgumentNullException("cloudFile"); |
894 |
if (fileInfo == null) |
895 |
throw new ArgumentNullException("fileInfo"); |
896 |
if (String.IsNullOrWhiteSpace(url)) |
897 |
throw new ArgumentNullException(url); |
898 |
if (treeHash==null) |
899 |
throw new ArgumentNullException("treeHash"); |
900 |
Contract.EndContractBlock(); |
901 |
|
902 |
var fullFileName = fileInfo.FullName; |
903 |
|
904 |
var account = cloudFile.Account ?? accountInfo.UserName; |
905 |
var container = cloudFile.Container ?? FolderConstants.PithosContainer; |
906 |
|
907 |
var client = new CloudFilesClient(accountInfo); |
908 |
//Send the hashmap to the server |
909 |
var hashPut = client.PutHashMap(account, container, url, treeHash.Result); |
910 |
yield return hashPut; |
911 |
|
912 |
var missingHashes = hashPut.Result; |
913 |
//If the server returns no missing hashes, we are done |
914 |
while (missingHashes.Count > 0) |
915 |
{ |
916 |
|
917 |
var buffer = new byte[accountInfo.BlockSize]; |
918 |
foreach (var missingHash in missingHashes) |
919 |
{ |
920 |
//Find the proper block |
921 |
var blockIndex = treeHash.Result.HashDictionary[missingHash]; |
922 |
var offset = blockIndex*accountInfo.BlockSize; |
923 |
|
924 |
var read = fileInfo.Read(buffer, offset, accountInfo.BlockSize); |
925 |
|
926 |
//And upload the block |
927 |
var postBlock = client.PostBlock(account, container, buffer, 0, read); |
928 |
|
929 |
//We have to handle possible exceptions in a continuation because |
930 |
//*yield return* can't appear inside a try block |
931 |
yield return postBlock.ContinueWith(t => |
932 |
t.ReportExceptions( |
933 |
exc => Log.ErrorFormat("[ERROR] uploading block {0} of {1}\n{2}", blockIndex, fullFileName, exc), |
934 |
()=>Log.InfoFormat("[BLOCK] Block {0} of {1} uploaded", blockIndex,fullFileName))); |
935 |
} |
936 |
|
937 |
//Repeat until there are no more missing hashes |
938 |
hashPut = client.PutHashMap(account, container, url, treeHash.Result); |
939 |
yield return hashPut; |
940 |
missingHashes = hashPut.Result; |
941 |
} |
942 |
} |
943 |
|
944 |
|
945 |
public void AddAccount(AccountInfo accountInfo) |
946 |
{ |
947 |
if (!_accounts.Contains(accountInfo)) |
948 |
_accounts.Add(accountInfo); |
949 |
} |
950 |
} |
951 |
|
952 |
|
953 |
|
954 |
|
955 |
} |