internal static void RegisterVirtualPathProviderInternal(System.Web.Hosting.VirtualPathProvider virtualPathProvider)
 {
     System.Web.Hosting.VirtualPathProvider previous = _theHostingEnvironment._virtualPathProvider;
     _theHostingEnvironment._virtualPathProvider = virtualPathProvider;
     virtualPathProvider.Initialize(previous);
 }
Example #2
0
        private static void ScanForExistingTargetBlocks(LocalRestoreDatabase database, byte[] blockbuffer, System.Security.Cryptography.HashAlgorithm blockhasher, System.Security.Cryptography.HashAlgorithm filehasher, Options options, RestoreResults result)
        {
            // Scan existing files for existing BLOCKS
            using(var blockmarker = database.CreateBlockMarker())
            {
                var updateCount = 0L;
                foreach(var restorelist in database.GetExistingFilesWithBlocks())
                {
                    var rename = !options.Overwrite;
                    var targetpath = restorelist.TargetPath;
                    var targetfileid = restorelist.TargetFileID;
                    var targetfilehash = restorelist.TargetHash;
                    if (m_systemIO.FileExists(targetpath))
                    {
                        try
                        {
                            if (result.TaskControlRendevouz() == TaskControlState.Stop)
                                return;
                            
                            if (rename)
                                filehasher.Initialize();

                            using(var file = m_systemIO.FileOpenReadWrite(targetpath))
                            using(var block = new Blockprocessor(file, blockbuffer))
                                foreach(var targetblock in restorelist.Blocks)
                                {
                                    var size = block.Readblock();
                                    if (size <= 0)
                                        break;
    
                                    if (size == targetblock.Size)
                                    {
                                        var key = Convert.ToBase64String(blockhasher.ComputeHash(blockbuffer, 0, size));
                                        if (key == targetblock.Hash)
                                        {
                                            blockmarker.SetBlockRestored(targetfileid, targetblock.Index, key, size);
                                        }
                                    }
                                    
                                    if (rename)
                                        filehasher.TransformBlock(blockbuffer, 0, size, blockbuffer, 0);
                                }
                                
                            if (rename)
                            {
                                filehasher.TransformFinalBlock(blockbuffer, 0, 0);
                                var filekey = Convert.ToBase64String(filehasher.Hash);
                                if (filekey == targetfilehash)
                                {
                                    result.AddVerboseMessage("Target file exists and is correct version: {0}", targetpath);
                                    rename = false;
                                }
                                else
                                {
                                    // The new file will have none of the correct blocks,
                                    // even if the scanned file had some
                                    blockmarker.SetAllBlocksMissing(targetfileid);
                                }
                            }
                            
                            if (updateCount++ % 20 == 0)
                            {
                                blockmarker.UpdateProcessed(result.OperationProgressUpdater);
                                if (result.TaskControlRendevouz() == TaskControlState.Stop)
                                    return;
                            }
                        }
                        catch (Exception ex)
                        {
                            result.AddWarning(string.Format("Failed to read target file: \"{0}\", message: {1}", targetpath, ex.Message), ex);
                            if (ex is System.Threading.ThreadAbortException)
                                throw;
                        }                        
                    }
                    else
                    {
                        result.AddVerboseMessage("Target file does not exist: {0}", targetpath);
                        rename = false;
                    }
                    
                    if (rename)
                    {
                        //Select a new filename
                        var ext = m_systemIO.PathGetExtension(targetpath) ?? "";
                        if (!string.IsNullOrEmpty(ext) && !ext.StartsWith("."))
                            ext = "." + ext;
                        
                        // First we try with a simple date append, assuming that there are not many conflicts there
                        var newname = m_systemIO.PathChangeExtension(targetpath, null) + "." + database.RestoreTime.ToLocalTime().ToString("yyyy-MM-dd");
                        var tr = newname + ext;
                        var c = 0;
                        while (m_systemIO.FileExists(tr) && c < 1000)
                        {
                            try
                            {
                                // If we have a file with the correct name, 
                                // it is most likely the file we want
                                filehasher.Initialize();
                                
                                string key;
                                using(var file = m_systemIO.FileOpenReadWrite(tr))
                                    key = Convert.ToBase64String(filehasher.ComputeHash(file));
                                    
                                if (key == targetfilehash)
                                {
                                    blockmarker.SetAllBlocksRestored(targetfileid);
                                    break;
                                }
                            }
                            catch(Exception ex)
                            {
                                result.AddWarning(string.Format("Failed to read candidate restore target {0}", tr), ex);
                            }
                            tr = newname + " (" + (c++).ToString() + ")" + ext;
                        }
                        
                        newname = tr;
                        
                        result.AddVerboseMessage("Target file exists and will be restored to: {0}", newname);
                        database.UpdateTargetPath(targetfileid, newname); 
                    }                        
                    
                }

                blockmarker.UpdateProcessed(result.OperationProgressUpdater);
                blockmarker.Commit(result);
            }
        }
Example #3
0
        private static void ScanForExistingTargetBlocks(LocalRestoreDatabase database, byte[] blockbuffer, System.Security.Cryptography.HashAlgorithm blockhasher, System.Security.Cryptography.HashAlgorithm filehasher, Options options, RestoreResults result)
        {
            // Scan existing files for existing BLOCKS
            using(var blockmarker = database.CreateBlockMarker())
            {
                var updateCount = 0L;
                foreach(var restorelist in database.GetExistingFilesWithBlocks())
                {
                    var rename = !options.Overwrite;
                    var targetpath = restorelist.TargetPath;
                    var targetfileid = restorelist.TargetFileID;
                    var targetfilehash = restorelist.TargetHash;
                    var targetfilelength = restorelist.Length;
                    if (m_systemIO.FileExists(targetpath))
                    {
                        try
                        {
                            if (result.TaskControlRendevouz() == TaskControlState.Stop)
                                return;

                            var currentfilelength = m_systemIO.FileLength(targetpath);
                            var wasTruncated = false;

                            // Adjust file length in overwrite mode if necessary (smaller is ok, will be extended during restore)
                            // We do it before scanning for blocks. This allows full verification on files that only needs to
                            // be truncated (i.e. forthwritten log files).
                            if (!rename && currentfilelength > targetfilelength)
                            {
                                var currentAttr = m_systemIO.GetFileAttributes(targetpath);
                                if ((currentAttr & System.IO.FileAttributes.ReadOnly) != 0) // clear readonly attribute
                                {
                                    if (options.Dryrun) result.AddDryrunMessage(string.Format("Would reset read-only attribute on file: {0}", targetpath));
                                    else m_systemIO.SetFileAttributes(targetpath, currentAttr & ~System.IO.FileAttributes.ReadOnly);
                                }
                                if (options.Dryrun)
                                    result.AddDryrunMessage(string.Format("Would truncate file '{0}' to length of {1:N0} bytes", targetpath, targetfilelength));
                                else
                                {
                                    using (var file = m_systemIO.FileOpenWrite(targetpath))
                                        file.SetLength(targetfilelength);
                                    currentfilelength = targetfilelength;
                                }
                                wasTruncated = true;
                            }

                            // If file size does not match and we have to rename on conflict,
                            // the whole scan can be skipped here because all blocks have to be restored anyway.
                            // For the other cases, we will check block and and file hashes and look for blocks
                            // to be restored and files that can already be verified.
                            if (!rename || currentfilelength == targetfilelength)
                            {
                                // a file hash for verification will only be necessary if the file has exactly
                                // the wanted size so we have a chance to already mark the file as data-verified.
                                bool calcFileHash = (currentfilelength == targetfilelength);
                                if (calcFileHash) filehasher.Initialize();

                                using (var file = m_systemIO.FileOpenRead(targetpath))
                                using (var block = new Blockprocessor(file, blockbuffer))
                                    foreach (var targetblock in restorelist.Blocks)
                                    {
                                        var size = block.Readblock();
                                        if (size <= 0)
                                            break;

                                        //TODO: Handle Metadata

                                        bool blockhashmatch = false;
                                        if (size == targetblock.Size)
                                        {
                                            // Parallelize file hash calculation on rename. Running read-only on same array should not cause conflicts or races.
                                            // Actually, in future always calculate the file hash and mark the file data as already verified.

                                            System.Threading.Tasks.Task calcFileHashTask = null;
                                            if (calcFileHash)
                                                calcFileHashTask = System.Threading.Tasks.Task.Run(
                                                    () => filehasher.TransformBlock(blockbuffer, 0, size, blockbuffer, 0));

                                            var key = Convert.ToBase64String(blockhasher.ComputeHash(blockbuffer, 0, size));

                                            if (calcFileHashTask != null) calcFileHashTask.Wait(); // wait because blockbuffer will be overwritten.

                                            if (key == targetblock.Hash)
                                            {
                                                blockmarker.SetBlockRestored(targetfileid, targetblock.Index, key, size, false);
                                                blockhashmatch = true;
                                            }
                                        }
                                        if (calcFileHash && !blockhashmatch) // will not be necessary anymore
                                        {
                                            filehasher.TransformFinalBlock(blockbuffer, 0, 0); // So a new initialize will not throw
                                            calcFileHash = false;
                                            if (rename) // file does not match. So break.
                                                break;
                                        }
                                    }

                                bool fullfilehashmatch = false;
                                if (calcFileHash) // now check if files are identical
                                {
                                    filehasher.TransformFinalBlock(blockbuffer, 0, 0);
                                    var filekey = Convert.ToBase64String(filehasher.Hash);
                                    fullfilehashmatch = (filekey == targetfilehash);
                                }

                                if (!rename && !fullfilehashmatch && !wasTruncated) // Reset read-only attribute (if set) to overwrite
                                {
                                    var currentAttr = m_systemIO.GetFileAttributes(targetpath);
                                    if ((currentAttr & System.IO.FileAttributes.ReadOnly) != 0)
                                    {
                                        if (options.Dryrun) result.AddDryrunMessage(string.Format("Would reset read-only attribute on file: {0}", targetpath));
                                        else m_systemIO.SetFileAttributes(targetpath, currentAttr & ~System.IO.FileAttributes.ReadOnly);
                                    }
                                }

                                if (fullfilehashmatch)
                                {
                                    //TODO: Check metadata to trigger rename? If metadata changed, it will still be restored for the file in-place.
                                    blockmarker.SetFileDataVerified(targetfileid);
                                    result.AddVerboseMessage("Target file exists{1} and is correct version: {0}", targetpath, wasTruncated ? " (but was truncated)" : "");
                                    rename = false;
                                }
                                else if (rename)
                                {
                                    // The new file will have none of the correct blocks,
                                    // even if the scanned file had some
                                    blockmarker.SetAllBlocksMissing(targetfileid);
                                }
                            }

                            if ((++updateCount) % 20 == 0)
                            {
                                blockmarker.UpdateProcessed(result.OperationProgressUpdater);
                                if (result.TaskControlRendevouz() == TaskControlState.Stop)
                                    return;
                            }
                        }
                        catch (Exception ex)
                        {
                            result.AddWarning(string.Format("Failed to read target file: \"{0}\", message: {1}", targetpath, ex.Message), ex);
                            if (ex is System.Threading.ThreadAbortException)
                                throw;
                        }
                    }
                    else
                    {
                        result.AddVerboseMessage("Target file does not exist: {0}", targetpath);
                        rename = false;
                    }

                    if (rename)
                    {
                        //Select a new filename
                        var ext = m_systemIO.PathGetExtension(targetpath) ?? "";
                        if (!string.IsNullOrEmpty(ext) && !ext.StartsWith("."))
                            ext = "." + ext;

                        // First we try with a simple date append, assuming that there are not many conflicts there
                        var newname = m_systemIO.PathChangeExtension(targetpath, null) + "." + database.RestoreTime.ToLocalTime().ToString("yyyy-MM-dd", System.Globalization.CultureInfo.InvariantCulture);
                        var tr = newname + ext;
                        var c = 0;
                        while (m_systemIO.FileExists(tr) && c < 1000)
                        {
                            try
                            {
                                // If we have a file with the correct name,
                                // it is most likely the file we want
                                filehasher.Initialize();

                                string key;
                                using(var file = m_systemIO.FileOpenRead(tr))
                                    key = Convert.ToBase64String(filehasher.ComputeHash(file));

                                if (key == targetfilehash)
                                {
                                    //TODO: Also needs metadata check to make correct decision.
                                    //      We stick to the policy to restore metadata in place, if data ok. So, metadata block may be restored.
                                    blockmarker.SetAllBlocksRestored(targetfileid, false);
                                    blockmarker.SetFileDataVerified(targetfileid);
                                    break;
                                }
                            }
                            catch(Exception ex)
                            {
                                result.AddWarning(string.Format("Failed to read candidate restore target {0}", tr), ex);
                            }
                            tr = newname + " (" + (c++).ToString() + ")" + ext;
                        }

                        newname = tr;

                        result.AddVerboseMessage("Target file exists and will be restored to: {0}", newname);
                        database.UpdateTargetPath(targetfileid, newname);
                    }

                }

                blockmarker.UpdateProcessed(result.OperationProgressUpdater);
                blockmarker.Commit(result);
            }
        }