code.grnet.gr Git - pithos-ms-client/blob - trunk/Pithos.Network/BlockHashAlgorithms.cs

   1 #region\r
   2 /* -----------------------------------------------------------------------\r
   3  * <copyright file="BlockHashAlgorithms.cs" company="GRNet">\r
   4  * \r
   5  * Copyright 2011-2012 GRNET S.A. All rights reserved.\r
   6  *\r
   7  * Redistribution and use in source and binary forms, with or\r
   8  * without modification, are permitted provided that the following\r
   9  * conditions are met:\r
  10  *\r
  11  *   1. Redistributions of source code must retain the above\r
  12  *      copyright notice, this list of conditions and the following\r
  13  *      disclaimer.\r
  14  *\r
  15  *   2. Redistributions in binary form must reproduce the above\r
  16  *      copyright notice, this list of conditions and the following\r
  17  *      disclaimer in the documentation and/or other materials\r
  18  *      provided with the distribution.\r
  19  *\r
  20  *\r
  21  * THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS\r
  22  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED\r
  23  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR\r
  24  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR\r
  25  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,\r
  26  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT\r
  27  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF\r
  28  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED\r
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT\r
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN\r
  31  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE\r
  32  * POSSIBILITY OF SUCH DAMAGE.\r
  33  *\r
  34  * The views and conclusions contained in the software and\r
  35  * documentation are those of the authors and should not be\r
  36  * interpreted as representing official policies, either expressed\r
  37  * or implied, of GRNET S.A.\r
  38  * </copyright>\r
  39  * -----------------------------------------------------------------------\r
  40  */\r
  41 #endregion\r
  42 using System.Collections.Concurrent;\r
  43 using System.Diagnostics.Contracts;\r
  44 using System.IO;\r
  45 using System.Reflection;\r
  46 using System.Security.Cryptography;\r
  47 using System.ServiceModel.Channels;\r
  48 using System.Threading;\r
  49 using System.Threading.Tasks;\r
  50 using System.Threading.Tasks.Dataflow;\r
  51 \r
  52 namespace Pithos.Network\r
  53 {\r
  54     using System;\r
  55 \r
  56     /// <summary>\r
  57     /// TODO: Update summary.\r
  58     /// </summary>\r
  59     public static class BlockHashAlgorithms\r
  60     {\r
  61         private static readonly log4net.ILog Log = log4net.LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);\r
  62 \r
  63 /*\r
  64         public static Func<FileStream, int, string, ConcurrentDictionary<int, byte[]>, int, Task<ConcurrentDictionary<int, byte[]>>> CalculateBlockHash;\r
  65 \r
  66         public static Task<ConcurrentDictionary<int, byte[]>> CalculateBlockHashesRecursiveAsync(FileStream stream, int blockSize, string algorithm, ConcurrentDictionary<int, byte[]> hashes = null, int index = 0)\r
  67         {\r
  68             if (stream == null)\r
  69                 throw new ArgumentNullException("stream");\r
  70             if (String.IsNullOrWhiteSpace(algorithm))\r
  71                 throw new ArgumentNullException("algorithm");\r
  72             if (blockSize <= 0)\r
  73                 throw new ArgumentOutOfRangeException("blockSize", "blockSize must be a value greater than zero ");\r
  74             if (index < 0)\r
  75                 throw new ArgumentOutOfRangeException("index", "index must be a non-negative value");\r
  76             Contract.EndContractBlock();\r
  77 \r
  78 \r
  79             if (hashes == null)\r
  80                 hashes = new ConcurrentDictionary<int, byte[]>();\r
  81 \r
  82             var buffer = new byte[blockSize];\r
  83             return stream.ReadAsync(buffer, 0, blockSize).ContinueWith(t =>\r
  84             {\r
  85                 var read = t.Result;\r
  86 \r
  87                 var nextTask = read == blockSize\r
  88                                     ? CalculateBlockHashesRecursiveAsync(stream, blockSize, algorithm, hashes, index + 1)\r
  89                                     : Task.Factory.StartNew(() => hashes);\r
  90                 if (read > 0)\r
  91                     using (var hasher = HashAlgorithm.Create(algorithm))\r
  92                     {\r
  93                         //This code was added for compatibility with the way Pithos calculates the last hash\r
  94                         //We calculate the hash only up to the last non-null byte\r
  95                         var lastByteIndex = Array.FindLastIndex(buffer, read - 1, aByte => aByte != 0);\r
  96 \r
  97                         var hash = hasher.ComputeHash(buffer, 0, lastByteIndex + 1);\r
  98                         hashes[index] = hash;\r
  99                     }\r
 100                 return nextTask;\r
 101             }).Unwrap();\r
 102         }\r
 103         public static async Task<ConcurrentDictionary<int, byte[]>> CalculateBlockHashesAsync(FileStream stream, int blockSize, string algorithm, ConcurrentDictionary<int, byte[]> hashes = null, int index = 0)\r
 104         {\r
 105             if (stream == null)\r
 106                 throw new ArgumentNullException("stream");\r
 107             if (String.IsNullOrWhiteSpace(algorithm))\r
 108                 throw new ArgumentNullException("algorithm");\r
 109             if (blockSize <= 0)\r
 110                 throw new ArgumentOutOfRangeException("blockSize", "blockSize must be a value greater than zero ");\r
 111             Contract.EndContractBlock();\r
 112 \r
 113 \r
 114             if (hashes == null)\r
 115                 hashes = new ConcurrentDictionary<int, byte[]>();\r
 116 \r
 117             var buffer = new byte[blockSize];\r
 118             int read;\r
 119             while ((read = await stream.ReadAsync(buffer, 0, blockSize)) > 0)\r
 120             {\r
 121                 using (var hasher = HashAlgorithm.Create(algorithm))\r
 122                 {\r
 123                     //This code was added for compatibility with the way Pithos calculates the last hash\r
 124                     //We calculate the hash only up to the last non-null byte\r
 125                     var lastByteIndex = Array.FindLastIndex(buffer, read - 1, aByte => aByte != 0);\r
 126 \r
 127                     var hash = hasher.ComputeHash(buffer, 0, lastByteIndex + 1);\r
 128                     hashes[index] = hash;\r
 129                 }\r
 130                 index += read;\r
 131             }\r
 132             return hashes;\r
 133         }\r
 134         \r
 135         public static async Task<ConcurrentDictionary<int, byte[]>> CalculateBlockHashesAgentAsync(FileStream stream, int blockSize, string algorithm, int parallelism)\r
 136         {\r
 137             if (stream == null)\r
 138                 throw new ArgumentNullException("stream");\r
 139             if (String.IsNullOrWhiteSpace(algorithm))\r
 140                 throw new ArgumentNullException("algorithm");\r
 141             if (blockSize <= 0)\r
 142                 throw new ArgumentOutOfRangeException("blockSize", "blockSize must be a value greater than zero ");\r
 143             Contract.EndContractBlock();\r
 144 \r
 145             var hashes = new ConcurrentDictionary<int, byte[]>();\r
 146 \r
 147             var path = stream.Name;\r
 148             var size = stream.Length;\r
 149             Log.DebugFormat("Hashing [{0}] size [{1}]",path,size);\r
 150             \r
 151             var options = new ExecutionDataflowBlockOptions {BoundedCapacity = parallelism,MaxDegreeOfParallelism=parallelism};\r
 152             var hashBlock=new ActionBlock<Tuple<int,byte[]>>(input=>\r
 153                               {\r
 154                                   int idx = input.Item1;\r
 155                                   byte[] block = input.Item2;\r
 156                                   using (var hasher = HashAlgorithm.Create(algorithm))\r
 157                                   {\r
 158                                       //This code was added for compatibility with the way Pithos calculates the last hash\r
 159                                       //We calculate the hash only up to the last non-null byte\r
 160                                       var lastByteIndex = Array.FindLastIndex(block, block.Length-1, aByte => aByte != 0);\r
 161 \r
 162                                       var hash = hasher.ComputeHash(block, 0, lastByteIndex + 1);\r
 163                                       hashes[idx] = hash;\r
 164                                   }                                  \r
 165                               },options);\r
 166 \r
 167             var buffer = new byte[blockSize];\r
 168             int read;\r
 169             int index = 0;\r
 170             while ((read = await stream.ReadAsync(buffer, 0, blockSize)) > 0)\r
 171             {\r
 172                 var block = new byte[read];\r
 173                 Buffer.BlockCopy(buffer, 0, block, 0, read);\r
 174                 await hashBlock.SendAsync(Tuple.Create(index, block));\r
 175                 index += read;\r
 176             }\r
 177             \r
 178 \r
 179             hashBlock.Complete();\r
 180             await hashBlock.Completion;\r
 181 \r
 182             return hashes;\r
 183         } \r
 184         \r
 185         public static async Task<ConcurrentDictionary<int, byte[]>> CalculateBlockHashesInPlace(FileStream stream, int blockSize, string algorithm, int parallelism)\r
 186         {\r
 187             if (stream == null)\r
 188                 throw new ArgumentNullException("stream");\r
 189             if (String.IsNullOrWhiteSpace(algorithm))\r
 190                 throw new ArgumentNullException("algorithm");\r
 191             if (blockSize <= 0)\r
 192                 throw new ArgumentOutOfRangeException("blockSize", "blockSize must be a value greater than zero ");\r
 193             Contract.EndContractBlock();\r
 194 \r
 195             var hashes = new ConcurrentDictionary<int, byte[]>();\r
 196 \r
 197             var path = stream.Name;\r
 198             var size = stream.Length;\r
 199             Log.DebugFormat("Hashing [{0}] size [{1}]",path,size);\r
 200             \r
 201 \r
 202             var buffer = new byte[blockSize];\r
 203             var index = 0;\r
 204             using (var hasher = HashAlgorithm.Create(algorithm))\r
 205             {\r
 206                 int read;\r
 207                 while ((read = await stream.ReadAsync(buffer, 0, blockSize)) > 0)\r
 208                 {\r
 209                     //This code was added for compatibility with the way Pithos calculates the last hash\r
 210                     //We calculate the hash only up to the last non-null byte\r
 211                     var lastByteIndex = Array.FindLastIndex(buffer, read - 1, aByte => aByte != 0);\r
 212 \r
 213                     var hash = hasher.ComputeHash(buffer, 0, lastByteIndex + 1);\r
 214                     Log.DebugFormat("Hashed [{0}] [{1}/{2}] [{3:p}]", path, index,size,(double)index/size);\r
 215                     hashes[index] = hash;\r
 216                     index += read;\r
 217                 }\r
 218             }\r
 219             return hashes;\r
 220         }\r
 221 */\r
 222 \r
 223         private static BufferManager _bufferMgr;\r
 224 \r
 225         private static BufferManager GetBufferManager(int blockSize,int parallelism)\r
 226         {\r
 227             Interlocked.CompareExchange(ref _bufferMgr,\r
 228                                         BufferManager.CreateBufferManager(parallelism*blockSize, blockSize),\r
 229                                         null);\r
 230             return _bufferMgr;\r
 231         }\r
 232 \r
 233         public static async Task<ConcurrentDictionary<long, byte[]>> CalculateBlockHashesInPlacePFor(FileStream stream, int blockSize, string algorithm, int parallelism,IProgress<double> progress )\r
 234         {\r
 235             if (stream == null)\r
 236                 throw new ArgumentNullException("stream");\r
 237             if (String.IsNullOrWhiteSpace(algorithm))\r
 238                 throw new ArgumentNullException("algorithm");\r
 239             if (blockSize <= 0)\r
 240                 throw new ArgumentOutOfRangeException("blockSize", "blockSize must be a value greater than zero ");\r
 241             Contract.EndContractBlock();\r
 242 \r
 243             var hashes = new ConcurrentDictionary<long, byte[]>();\r
 244 \r
 245             var path = stream.Name;\r
 246             var size = stream.Length;\r
 247             Log.DebugFormat("Hashing [{0}] size [{1}]", path, size);\r
 248 \r
 249             //TODO: Handle zero-length files\r
 250             if (size == 0)\r
 251             {\r
 252                 var buf = new byte[0];\r
 253                 var hasher=HashAlgorithm.Create(algorithm);                \r
 254                 hashes[0]=hasher.ComputeHash(buf);\r
 255                 return hashes;\r
 256             }\r
 257 \r
 258 \r
 259             var buffer = new byte[parallelism][];\r
 260             var hashers = new HashAlgorithm[parallelism];\r
 261             var bufferManager = GetBufferManager(blockSize, parallelism);\r
 262             for (var i = 0; i < parallelism; i++)\r
 263             {\r
 264                 buffer[i] = bufferManager.TakeBuffer(blockSize);// new byte[blockSize];\r
 265                 hashers[i] = HashAlgorithm.Create(algorithm);\r
 266             }\r
 267             try\r
 268             {\r
 269                 var indices = new long[parallelism];\r
 270                 var bufferCount = new int[parallelism];\r
 271 \r
 272                 int read;\r
 273                 int bufIdx = 0;\r
 274                 long index = 0;\r
 275 \r
 276 \r
 277                 while ((read = await stream.ReadAsync(buffer[bufIdx], 0, blockSize).ConfigureAwait(false)) > 0)\r
 278                 {\r
 279                     index += read;\r
 280                     indices[bufIdx] = index;\r
 281                     bufferCount[bufIdx] = read;\r
 282                     //If we have filled the last buffer or if we have read from the last block,\r
 283                     //we can calculate the clocks in parallel\r
 284                     if (bufIdx == parallelism - 1 || read < blockSize)\r
 285                     {\r
 286                         //var options = new ParallelOptions {MaxDegreeOfParallelism = parallelism};\r
 287                         Parallel.For(0, bufIdx + 1, idx =>\r
 288                                                         {\r
 289                                                             //This code was added for compatibility with the way Pithos calculates the last hash\r
 290                                                             //We calculate the hash only up to the last non-null byte\r
 291                                                             var lastByteIndex = Array.FindLastIndex(buffer[idx],\r
 292                                                                                                     bufferCount[idx] - 1,\r
 293                                                                                                     aByte => aByte != 0);\r
 294 \r
 295                                                             var hasher = hashers[idx];\r
 296                                                             var hash = hasher.ComputeHash(buffer[idx], 0,\r
 297                                                                                           lastByteIndex + 1);\r
 298                                                             var filePosition = indices[idx];\r
 299                                                             /*\r
 300                                                         Trace.TraceInformation("Hashed [{0}] [{1}/{2}] [{3:p}]", path,\r
 301                                                                                 filePosition, size,\r
 302                                                                                 (double)filePosition / size);\r
 303                             */\r
 304                                                             hashes[filePosition] = hash;\r
 305                                                             progress.Report((long)hashes.Count*blockSize*1.0/stream.Length);\r
 306                                                         });\r
 307                     }\r
 308                     bufIdx = (bufIdx + 1)%parallelism;\r
 309                 }\r
 310             }\r
 311             finally\r
 312             {\r
 313                 for (var i = 0; i < parallelism; i++)\r
 314                 {\r
 315                     if (hashers[i] != null)\r
 316                         hashers[i].Dispose();\r
 317                     bufferManager.ReturnBuffer(buffer[i]);\r
 318                 }\r
 319 \r
 320             }\r
 321 \r
 322             return hashes;\r
 323         }\r
 324 \r
 325         static BlockHashAlgorithms()\r
 326         {\r
 327 /*\r
 328             CalculateBlockHash = CalculateBlockHashesRecursiveAsync;\r
 329 */\r
 330         }\r
 331     }\r
 332 }\r