code.grnet.gr Git - pithos-ms-client/blob - trunk/Pithos.Core/Agents/StatusAgent.cs

   1 using System;
   2 using System.Collections.Generic;
   3 using System.ComponentModel.Composition;
   4 using System.Data.SQLite;
   5 using System.Diagnostics;
   6 using System.Diagnostics.Contracts;
   7 using System.IO;
   8 using System.Linq;
   9 using System.Threading;
  10 using System.Threading.Tasks;
  11 using Castle.ActiveRecord;
  12 using Castle.ActiveRecord.Framework.Config;
  13 using Pithos.Interfaces;
  14 using Pithos.Network;
  15 using log4net;
  16
  17 namespace Pithos.Core.Agents
  18 {
  19     [Export(typeof(IStatusChecker)),Export(typeof(IStatusKeeper))]
  20     public class StatusAgent:IStatusChecker,IStatusKeeper
  21     {
  22         [System.ComponentModel.Composition.Import]
  23         public IPithosSettings Settings { get; set; }
  24
  25         private Agent<Action> _persistenceAgent;
  26
  27
  28         private static readonly ILog Log = LogManager.GetLogger("StatusAgent");
  29
  30         public StatusAgent()
  31         {
  32             var appDataPath = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
  33             _pithosDataPath = Path.Combine(appDataPath , "Pithos");
  34
  35             if (!Directory.Exists(_pithosDataPath))
  36                 Directory.CreateDirectory(_pithosDataPath);
  37             var source = GetConfiguration(_pithosDataPath);
  38             ActiveRecordStarter.Initialize(source,typeof(FileState),typeof(FileTag));
  39             ActiveRecordStarter.UpdateSchema();
  40
  41             if (!File.Exists(Path.Combine(_pithosDataPath ,"pithos.db")))
  42                 ActiveRecordStarter.CreateSchema();
  43         }
  44
  45         private static InPlaceConfigurationSource GetConfiguration(string pithosDbPath)
  46         {
  47             if (String.IsNullOrWhiteSpace(pithosDbPath))
  48                 throw new ArgumentNullException("pithosDbPath");
  49             if (!Path.IsPathRooted(pithosDbPath))
  50                 throw new ArgumentException("path must be a rooted path", "pithosDbPath");
  51             Contract.EndContractBlock();
  52
  53             var properties = new Dictionary<string, string>
  54                                  {
  55                                      {"connection.driver_class", "NHibernate.Driver.SQLite20Driver"},
  56                                      {"dialect", "NHibernate.Dialect.SQLiteDialect"},
  57                                      {"connection.provider", "NHibernate.Connection.DriverConnectionProvider"},
  58                                      {
  59                                          "proxyfactory.factory_class",
  60                                          "NHibernate.ByteCode.Castle.ProxyFactoryFactory, NHibernate.ByteCode.Castle"
  61                                          },
  62                                  };
  63
  64             var connectionString = String.Format(@"Data Source={0}\pithos.db;Version=3", pithosDbPath);
  65             properties.Add("connection.connection_string", connectionString);
  66
  67             var source = new InPlaceConfigurationSource();
  68             source.Add(typeof (ActiveRecordBase), properties);
  69             source.SetDebugFlag(false);
  70             return source;
  71         }
  72
  73         public void StartProcessing(CancellationToken token)
  74         {
  75             _persistenceAgent = Agent<Action>.Start(queue =>
  76             {
  77                 Action loop = null;
  78                 loop = () =>
  79                 {
  80                     var job = queue.Receive();
  81                     job.ContinueWith(t =>
  82                     {
  83                         var action = job.Result;
  84                         try
  85                         {
  86                             action();
  87                         }
  88                         catch (SQLiteException ex)
  89                         {
  90                             Log.ErrorFormat("[ERROR] SQL \n{0}", ex);
  91                         }
  92                         catch (Exception ex)
  93                         {
  94                             Log.ErrorFormat("[ERROR] STATE \n{0}", ex);
  95                         }
  96 // ReSharper disable AccessToModifiedClosure
  97                         queue.DoAsync(loop);
  98 // ReSharper restore AccessToModifiedClosure
  99                     });
 100                 };
 101                 loop();
 102             });
 103
 104         }
 105
 106
 107
 108         public void Stop()
 109         {
 110             _persistenceAgent.Stop();
 111         }
 112
 113
 114         public void ProcessExistingFiles(IEnumerable<FileInfo> existingFiles)
 115         {
 116             if(existingFiles  ==null)
 117                 throw new ArgumentNullException("existingFiles");
 118             Contract.EndContractBlock();
 119
 120             //Find new or matching files with a left join to the stored states
 121             var fileStates = FileState.Queryable;
 122             var currentFiles=from file in existingFiles
 123                       join state in fileStates on file.FullName.ToLower() equals state.FilePath.ToLower() into gs
 124                       from substate in gs.DefaultIfEmpty()
 125                                select new {File = file, State = substate};
 126
 127             //To get the deleted files we must get the states that have no corresponding
 128             //files.
 129             //We can't use the File.Exists method inside a query, so we get all file paths from the states
 130             var statePaths = (from state in fileStates
 131                              select new {state.Id, state.FilePath}).ToList();
 132             //and check each one
 133             var missingStates= (from path in statePaths
 134                                 where !File.Exists(path.FilePath) && !Directory.Exists(path.FilePath)
 135                                select path.Id).ToList();
 136             //Finally, retrieve the states that correspond to the deleted files
 137             var deletedFiles = from state in fileStates
 138                         where missingStates.Contains(state.Id)
 139                         select new { File = default(FileInfo), State = state };
 140
 141             var pairs = currentFiles.Union(deletedFiles);
 142
 143             Parallel.ForEach(pairs, pair =>
 144             {
 145                 var fileState = pair.State;
 146                 var file = pair.File;
 147                 if (fileState == null)
 148                 {
 149                     //This is a new file
 150                     var fullPath = pair.File.FullName.ToLower();
 151                     var createState = FileState.CreateForAsync(fullPath, BlockSize, BlockHash);
 152                     createState.ContinueWith(state => _persistenceAgent.Post(state.Result.Create));
 153                 }
 154                 else if (file == null)
 155                 {
 156                     //This file was deleted while we were down. We should mark it as deleted
 157                     //We have to go through UpdateStatus here because the state object we are using
 158                     //was created by a different ORM session.
 159                     FileState.UpdateStatus(fileState.Id,FileStatus.Deleted);
 160                 }
 161                 else
 162                 {
 163                     //This file has a matching state. Need to check for possible changes
 164                     var hashString = file.CalculateHash(BlockSize,BlockHash);
 165                     //If the hashes don't match the file was changed
 166                     if (fileState.Checksum != hashString)
 167                     {
 168                         FileState.UpdateStatus(fileState.Id, FileStatus.Modified);
 169                     }
 170                 }
 171             });
 172
 173         }
 174
 175
 176
 177
 178         public string BlockHash { get; set; }
 179
 180         public int BlockSize { get; set; }
 181         public void ChangeRoots(string oldPath, string newPath)
 182         {
 183             if (String.IsNullOrWhiteSpace(oldPath))
 184                 throw new ArgumentNullException("oldPath");
 185             if (!Path.IsPathRooted(oldPath))
 186                 throw new ArgumentException("oldPath must be an absolute path", "oldPath");
 187             if (string.IsNullOrWhiteSpace(newPath))
 188                 throw new ArgumentNullException("newPath");
 189             if (!Path.IsPathRooted(newPath))
 190                 throw new ArgumentException("newPath must be an absolute path", "newPath");
 191             Contract.EndContractBlock();
 192
 193             FileState.ChangeRootPath(oldPath,newPath);
 194
 195         }
 196
 197         private PithosStatus _pithosStatus=PithosStatus.InSynch;
 198
 199         public void SetPithosStatus(PithosStatus status)
 200         {
 201             _pithosStatus = status;
 202         }
 203
 204         public PithosStatus GetPithosStatus()
 205         {
 206             return _pithosStatus;
 207         }
 208
 209
 210         private readonly string _pithosDataPath;
 211
 212
 213         public FileOverlayStatus GetFileOverlayStatus(string path)
 214         {
 215             if (String.IsNullOrWhiteSpace(path))
 216                 throw new ArgumentNullException("path");
 217             if (!Path.IsPathRooted(path))
 218                 throw new ArgumentException("The path must be rooted", "path");
 219             Contract.EndContractBlock();
 220
 221             try
 222             {
 223
 224                 var status = from state in  FileState.Queryable
 225                                  where state.FilePath ==path.ToLower()
 226                                  select state.OverlayStatus;
 227                 return status.Any()? status.First():FileOverlayStatus.Unversioned;
 228             }
 229             catch (Exception exc)
 230             {
 231                 Log.ErrorFormat(exc.ToString());
 232                 return FileOverlayStatus.Unversioned;
 233             }
 234         }
 235
 236         public void SetFileOverlayStatus(string path, FileOverlayStatus overlayStatus)
 237         {
 238             if (String.IsNullOrWhiteSpace(path))
 239                 throw new ArgumentNullException("path");
 240             if (!Path.IsPathRooted(path))
 241                 throw new ArgumentException("The path must be rooted","path");
 242             Contract.EndContractBlock();
 243
 244             _persistenceAgent.Post(() => FileState.StoreOverlayStatus(path.ToLower(),overlayStatus));
 245         }
 246
 247        /* public void RenameFileOverlayStatus(string oldPath, string newPath)
 248         {
 249             if (String.IsNullOrWhiteSpace(oldPath))
 250                 throw new ArgumentNullException("oldPath");
 251             if (!Path.IsPathRooted(oldPath))
 252                 throw new ArgumentException("The oldPath must be rooted", "oldPath");
 253             if (String.IsNullOrWhiteSpace(newPath))
 254                 throw new ArgumentNullException("newPath");
 255             if (!Path.IsPathRooted(newPath))
 256                 throw new ArgumentException("The newPath must be rooted", "newPath");
 257             Contract.EndContractBlock();
 258
 259             _persistenceAgent.Post(() =>FileState.RenameState(oldPath, newPath));
 260         }*/
 261
 262         public void SetFileState(string path, FileStatus fileStatus, FileOverlayStatus overlayStatus)
 263         {
 264             if (String.IsNullOrWhiteSpace(path))
 265                 throw new ArgumentNullException("path");
 266             if (!Path.IsPathRooted(path))
 267                 throw new ArgumentException("The path must be rooted", "path");
 268             Contract.EndContractBlock();
 269
 270             Debug.Assert(!path.Contains(FolderConstants.CacheFolder));
 271             Debug.Assert(!path.EndsWith(".ignore"));
 272
 273             _persistenceAgent.Post(() => FileState.UpdateStatus(path.ToLower(), fileStatus, overlayStatus));
 274         }
 275
 276         public void StoreInfo(string path,ObjectInfo objectInfo)
 277         {
 278             if (String.IsNullOrWhiteSpace(path))
 279                 throw new ArgumentNullException("path");
 280             if (!Path.IsPathRooted(path))
 281                 throw new ArgumentException("The path must be rooted", "path");
 282             if (objectInfo == null)
 283                 throw new ArgumentNullException("objectInfo", "objectInfo can't be empty");
 284             Contract.EndContractBlock();
 285
 286             _persistenceAgent.Post(() =>
 287             {
 288                 var filePath = path.ToLower();
 289                 //Load the existing files state and set its properties in one session
 290                 using (new SessionScope())
 291                 {
 292                     //Forgetting to use a sessionscope results in two sessions being created, one by
 293                     //FirstOrDefault and one by Save()
 294                     var state =FileState.FindByFilePath(filePath);
 295
 296                     //Create a new empty state object if this is a new file
 297                     state = state ?? new FileState();
 298
 299                     state.FilePath = filePath;
 300                     state.Checksum = objectInfo.Hash;
 301                     state.Version = objectInfo.Version;
 302                     state.VersionTimeStamp = objectInfo.VersionTimestamp;
 303
 304                     state.FileStatus = FileStatus.Unchanged;
 305                     state.OverlayStatus = FileOverlayStatus.Normal;
 306
 307
 308                     //Do the save
 309                     state.Save();
 310                 }
 311             });
 312
 313         }
 314
 315
 316         public void SetFileStatus(string path, FileStatus status)
 317         {
 318             if (String.IsNullOrWhiteSpace(path))
 319                 throw new ArgumentNullException("path");
 320             if (!Path.IsPathRooted(path))
 321                 throw new ArgumentException("The path must be rooted", "path");
 322             Contract.EndContractBlock();
 323
 324             _persistenceAgent.Post(() => FileState.UpdateStatus(path.ToLower(), status));
 325         }
 326
 327         public FileStatus GetFileStatus(string path)
 328         {
 329             if (String.IsNullOrWhiteSpace(path))
 330                 throw new ArgumentNullException("path");
 331             if (!Path.IsPathRooted(path))
 332                 throw new ArgumentException("The path must be rooted", "path");
 333             Contract.EndContractBlock();
 334
 335             var status = from r in FileState.Queryable
 336                      where r.FilePath == path.ToLower()
 337                      select r.FileStatus;
 338             return status.Any()?status.First(): FileStatus.Missing;
 339         }
 340
 341         public void ClearFileStatus(string path)
 342         {
 343             if (String.IsNullOrWhiteSpace(path))
 344                 throw new ArgumentNullException("path");
 345             if (!Path.IsPathRooted(path))
 346                 throw new ArgumentException("The path must be rooted", "path");
 347             Contract.EndContractBlock();
 348
 349             _persistenceAgent.Post(() => FileState.DeleteByFilePath(path));
 350         }
 351
 352         public void UpdateFileChecksum(string path, string checksum)
 353         {
 354             if (String.IsNullOrWhiteSpace(path))
 355                 throw new ArgumentNullException("path");
 356             if (!Path.IsPathRooted(path))
 357                 throw new ArgumentException("The path must be rooted", "path");
 358             Contract.EndContractBlock();
 359
 360             _persistenceAgent.Post(() => FileState.UpdateChecksum(path.ToLower(), checksum));
 361         }
 362
 363     }
 364
 365
 366 }