/// <summary>
/// Adds metadata to output, and returns the metadataset ID
/// </summary>
/// <returns>The metadataset ID.</returns>
/// <param name="path">The path for which metadata is processed.</param>
/// <param name="meta">The metadata entry.</param>
/// <param name="database">The database connection.</param>
/// <param name="streamblockchannel">The channel to write streams to.</param>
internal static async Task <Tuple <bool, long> > AddMetadataToOutputAsync(string path, IMetahash meta, BackupDatabase database, IWriteChannel <StreamBlock> streamblockchannel)
{
StreamProcessResult res;
using (var ms = new MemoryStream(meta.Blob))
res = await StreamBlock.ProcessStream(streamblockchannel, path, ms, true, CompressionHint.Default);
return(await database.AddMetadatasetAsync(res.Streamhash, res.Streamlength, res.Blocksetid));
}
public static async Task <StreamProcessResult> ProcessStream(IWriteChannel <StreamBlock> channel, string path, Stream stream, bool isMetadata, CompressionHint hint)
{
var tcs = new TaskCompletionSource <StreamProcessResult>();
// limit the stream length to that found now, a fixed point in time
var limitedStream = new Library.Utility.ReadLimitLengthStream(stream, stream.Length);
var streamBlock = new StreamBlock
{
Path = path,
Stream = limitedStream,
IsMetadata = isMetadata,
Hint = hint,
Result = tcs
};
await channel.WriteAsync(streamBlock);
return(await tcs.Task.ConfigureAwait(false));
}
public static Task Run(Snapshots.ISnapshotService snapshot, Options options, BackupDatabase database, BackupStatsCollector stats, ITaskReader taskreader)
{
return(AutomationExtensions.RunTask(
new
{
Input = Channels.AcceptedChangedFile.ForRead,
StreamBlockChannel = Channels.StreamBlock.ForWrite,
},
async self =>
{
var blocksize = options.Blocksize;
while (await taskreader.ProgressAsync)
{
var e = await self.Input.ReadAsync();
try
{
var hint = options.GetCompressionHintFromFilename(e.Path);
var oldHash = e.OldId < 0 ? null : await database.GetFileHashAsync(e.OldId);
StreamProcessResult filestreamdata;
// Process metadata and actual data in parallel
var metatask =
Task.Run(async() =>
{
// If we have determined that metadata has not changed, just grab the ID
if (!e.MetadataChanged)
{
var res = await database.GetMetadataIDAsync(e.MetaHashAndSize.FileHash, e.MetaHashAndSize.Blob.Length);
if (res.Item1)
{
return res.Item2;
}
Logging.Log.WriteWarningMessage(FILELOGTAG, "UnexpextedMetadataLookup", null, "Metadata was reported as not changed, but still requires being added?\nHash: {0}, Length: {1}, ID: {2}, Path: {3}", e.MetaHashAndSize.FileHash, e.MetaHashAndSize.Blob.Length, res.Item2, e.Path);
e.MetadataChanged = true;
}
return (await MetadataPreProcess.AddMetadataToOutputAsync(e.Path, e.MetaHashAndSize, database, self.StreamBlockChannel)).Item2;
});
using (var fs = snapshot.OpenRead(e.Path))
filestreamdata = await StreamBlock.ProcessStream(self.StreamBlockChannel, e.Path, fs, false, hint);
await stats.AddOpenedFile(filestreamdata.Streamlength);
var metadataid = await metatask;
var filekey = filestreamdata.Streamhash;
var filesize = filestreamdata.Streamlength;
if (oldHash != filekey)
{
if (oldHash == null)
{
Logging.Log.WriteVerboseMessage(FILELOGTAG, "NewFile", "New file {0}", e.Path);
}
else
{
Logging.Log.WriteVerboseMessage(FILELOGTAG, "ChangedFile", "File has changed {0}", e.Path);
}
if (e.OldId < 0)
{
await stats.AddAddedFile(filesize);
if (options.Dryrun)
{
Logging.Log.WriteVerboseMessage(FILELOGTAG, "WoudlAddNewFile", "Would add new file {0}, size {1}", e.Path, Library.Utility.Utility.FormatSizeString(filesize));
}
}
else
{
await stats.AddModifiedFile(filesize);
if (options.Dryrun)
{
Logging.Log.WriteVerboseMessage(FILELOGTAG, "WoudlAddChangedFile", "Would add changed file {0}, size {1}", e.Path, Library.Utility.Utility.FormatSizeString(filesize));
}
}
await database.AddFileAsync(e.Path, e.LastWrite, filestreamdata.Blocksetid, metadataid);
}
else if (e.MetadataChanged)
{
Logging.Log.WriteVerboseMessage(FILELOGTAG, "FileMetadataChanged", "File has only metadata changes {0}", e.Path);
await database.AddFileAsync(e.Path, e.LastWrite, filestreamdata.Blocksetid, metadataid);
}
else /*if (e.OldId >= 0)*/
{
// When we write the file to output, update the last modified time
Logging.Log.WriteVerboseMessage(FILELOGTAG, "NoFileChanges", "File has not changed {0}", e.Path);
try
{
await database.AddUnmodifiedAsync(e.OldId, e.LastWrite);
}
catch (Exception ex)
{
Logging.Log.WriteWarningMessage(FILELOGTAG, "FailedToAddFile", ex, "Failed while attempting to add unmodified file to database: {0}", e.Path);
}
}
}
catch (Exception ex)
{
if (ex.IsRetiredException())
{
return;
}
else
{
Logging.Log.WriteWarningMessage(FILELOGTAG, "PathProcessingFailed", ex, "Failed to process path: {0}", e.Path);
}
}
}
}
));
}
