204 lines
8.5 KiB
C#
204 lines
8.5 KiB
C#
// Copyright (C) 2015, The Duplicati Team
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// http://www.duplicati.com, info@duplicati.com
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//
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// This library is free software; you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as
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// published by the Free Software Foundation; either version 2.1 of the
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// License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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using System;
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using System.IO;
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using System.Security.Cryptography;
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using System.Threading.Tasks;
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using Duplicati.Library.Main.Volumes;
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namespace Duplicati.Library.Main.Operation.Common
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{
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/// <summary>
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/// A collection class for keeping the temporary data required to build an index file
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/// </summary>
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internal class TemporaryIndexVolume
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{
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/// <summary>
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/// The block hashes
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/// </summary>
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private readonly Library.Utility.FileBackedStringList blockHashes = new Library.Utility.FileBackedStringList();
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/// <summary>
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/// The blocklist hashes
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/// </summary>
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private readonly Library.Utility.FileBackedStringList blockListHashes = new Library.Utility.FileBackedStringList();
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/// <summary>
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/// Cached copy of the blocklist hash size
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/// </summary>
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private readonly int m_blockhashsize;
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/// <summary>
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/// Initializes a new instance of the
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/// <see cref="T:Duplicati.Library.Main.Operation.Common.TemporaryIndexVolume"/> class.
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/// </summary>
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/// <param name="options">The options used in this run.</param>
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public TemporaryIndexVolume(Options options)
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{
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m_blockhashsize = options.BlockhashSize;
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}
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/// <summary>
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/// Creates an index volume with the temporary contents
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/// </summary>
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/// <returns>The index volume.</returns>
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/// <param name="blockfilename">The name of the block file.</param>
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/// <param name="blockHash">Hash of the volume</param>
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/// <param name="blockSize">Size of the volume</param>
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public async Task<IndexVolumeWriter> CreateVolume(string blockfilename, string blockHash, long blockSize, Options options, DatabaseCommon database)
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{
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var w = new IndexVolumeWriter(options);
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w.VolumeID = await database.RegisterRemoteVolumeAsync(w.RemoteFilename, RemoteVolumeType.Index, RemoteVolumeState.Temporary);
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w.StartVolume(blockfilename);
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foreach (var n in blockHashes)
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{
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var args = n.Split(new char[] { ':' }, 2);
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w.AddBlock(args[1], long.Parse(args[0]));
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}
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w.FinishVolume(blockHash, blockSize);
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var enumerator = blockListHashes.GetEnumerator();
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while(enumerator.MoveNext())
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{
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var hash = enumerator.Current;
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enumerator.MoveNext();
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var data = Convert.FromBase64String(enumerator.Current);
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w.WriteBlocklist(hash, data, 0, data.Length);
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}
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w.Close();
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return w;
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}
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/// <summary>
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/// Copies all entries from this temporary instance to the target
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/// </summary>
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/// <param name="target">The target volume.</param>
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/// <param name="onlyBlocklistHashes">Only copies the blocklist hashes</param>
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public void CopyTo(TemporaryIndexVolume target, bool onlyBlocklistHashes)
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{
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if (!onlyBlocklistHashes)
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foreach (var n in blockHashes)
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target.blockHashes.Add(n);
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foreach (var n in blockListHashes)
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target.blockListHashes.Add(n);
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}
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/// <summary>
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/// Adds a single block hash to the index
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/// </summary>
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/// <param name="hash">The hash of the block.</param>
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/// <param name="size">The size of the block.</param>
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public void AddBlock(string hash, long size)
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{
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blockHashes.Add(size.ToString() + ":" + hash);
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}
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/// <summary>
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/// Adds a block list hash to the index
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/// </summary>
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/// <param name="hash">The hash of the block to add.</param>
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/// <param name="size">The size of the block.</param>
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/// <param name="data">The block contents.</param>
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public void AddBlockListHash(string hash, long size, byte[] data)
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{
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if (size % m_blockhashsize != 0)
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throw new ArgumentException($"The {nameof(size)} value is {size}, but it must be evenly divisible by the blockhash size ({m_blockhashsize})", nameof(size));
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blockListHashes.Add(hash);
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blockListHashes.Add(Convert.ToBase64String(data, 0, (int)size));
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}
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}
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/// <summary>
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/// Encapsulates creating an index file from the database contents
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/// </summary>
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internal static class IndexVolumeCreator
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{
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public static async Task<IndexVolumeWriter> CreateIndexVolume(string blockname, Options options, Common.DatabaseCommon database)
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{
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using(var h = HashAlgorithm.Create(options.BlockHashAlgorithm))
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{
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var w = new IndexVolumeWriter(options);
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w.VolumeID = await database.RegisterRemoteVolumeAsync(w.RemoteFilename, RemoteVolumeType.Index, RemoteVolumeState.Temporary);
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var blockvolume = await database.GetVolumeInfoAsync(blockname);
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w.StartVolume(blockname);
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foreach(var b in await database.GetBlocksAsync(blockvolume.ID))
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w.AddBlock(b.Hash, b.Size);
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w.FinishVolume(blockvolume.Hash, blockvolume.Size);
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if (options.IndexfilePolicy == Options.IndexFileStrategy.Full)
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foreach(var b in await database.GetBlocklistsAsync(blockvolume.ID, options.Blocksize, options.BlockhashSize))
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{
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var bh = Convert.ToBase64String(h.ComputeHash(b.Item2, 0, b.Item3));
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if (bh != b.Item1)
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throw new Exception(string.Format("Internal consistency check failed, generated index block has wrong hash, {0} vs {1}", bh, b.Item1));
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w.WriteBlocklist(b.Item1, b.Item2, 0, b.Item3);
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}
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w.Close();
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// Register that the index file is tracking the block file
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await database.AddIndexBlockLinkAsync(w.VolumeID, blockvolume.ID);
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return w;
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}
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}
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/*public static async Task<IndexVolumeWriter> ReCreateIndexVolume(string selfname, Options options, Repair.RepairDatabase database)
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{
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using(var h = System.Security.Cryptography.HashAlgorithm.Create(options.BlockHashAlgorithm))
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{
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var w = new IndexVolumeWriter(options);
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w.SetRemoteFilename(selfname);
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foreach(var blockvolume in await database.GetBlockVolumesFromIndexNameAsync(selfname))
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{
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w.StartVolume(blockvolume.Name);
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var volumeid = await database.GetRemoteVolumeIDAsync(blockvolume.Name);
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foreach(var b in await database.GetBlocksAsync(volumeid))
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w.AddBlock(b.Hash, b.Size);
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w.FinishVolume(blockvolume.Hash, blockvolume.Size);
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if (options.IndexfilePolicy == Options.IndexFileStrategy.Full)
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foreach(var b in await database.GetBlocklistsAsync(volumeid, options.Blocksize, options.BlockhashSize))
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{
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var bh = Convert.ToBase64String(h.ComputeHash(b.Item2, 0, b.Item3));
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if (bh != b.Item1)
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throw new Exception(string.Format("Internal consistency check failed, generated index block has wrong hash, {0} vs {1}", bh, b.Item1));
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w.WriteBlocklist(b.Item1, b.Item2, 0, b.Item3);
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}
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}
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w.Close();
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return w;
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}
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}*/
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}
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}
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