public static Task Run(Snapshots.ISnapshotService snapshot, Options options, BackupStatsCollector stats, BackupDatabase database)
{
return(AutomationExtensions.RunTask(
new
{
Input = Channels.ProcessedFiles.ForRead,
ProgressChannel = Channels.ProgressEvents.ForWrite,
Output = Channels.AcceptedChangedFile.ForWrite
},
async self =>
{
var EMPTY_METADATA = Utility.WrapMetadata(new Dictionary <string, string>(), options);
// Pre-cache the option variables here to simplify and
// speed up repeated option access below
var SKIPFILESLARGERTHAN = options.SkipFilesLargerThan;
// Zero and max both indicate no size limit
if (SKIPFILESLARGERTHAN == long.MaxValue)
{
SKIPFILESLARGERTHAN = 0;
}
var DISABLEFILETIMECHECK = options.DisableFiletimeCheck;
var CHECKFILETIMEONLY = options.CheckFiletimeOnly;
var SKIPMETADATA = options.SkipMetadata;
while (true)
{
var e = await self.Input.ReadAsync();
long filestatsize = -1;
try
{
filestatsize = snapshot.GetFileSize(e.Path);
}
catch (Exception ex)
{
Logging.Log.WriteExplicitMessage(FILELOGTAG, "FailedToReadSize", ex, "Failed to read size of file: {0}", e.Path);
}
await stats.AddExaminedFile(filestatsize);
// Stop now if the file is too large
var tooLargeFile = SKIPFILESLARGERTHAN != 0 && filestatsize >= 0 && filestatsize > SKIPFILESLARGERTHAN;
if (tooLargeFile)
{
Logging.Log.WriteVerboseMessage(FILELOGTAG, "SkipCheckTooLarge", "Skipped checking file, because the size exceeds limit {0}", e.Path);
await self.ProgressChannel.WriteAsync(new ProgressEvent()
{
Filepath = e.Path, Length = filestatsize, Type = EventType.FileSkipped
});
continue;
}
// Invalid ID indicates a new file
var isNewFile = e.OldId < 0;
// If we disable the filetime check, we always assume that the file has changed
// Otherwise we check that the timestamps are different or if any of them are empty
var timestampChanged = DISABLEFILETIMECHECK || e.LastWrite != e.OldModified || e.LastWrite.Ticks == 0 || e.OldModified.Ticks == 0;
// Avoid generating a new matadata blob if timestamp has not changed
// and we only check for timestamp changes
if (CHECKFILETIMEONLY && !timestampChanged && !isNewFile)
{
Logging.Log.WriteVerboseMessage(FILELOGTAG, "SkipCheckNoTimestampChange", "Skipped checking file, because timestamp was not updated {0}", e.Path);
try
{
await database.AddUnmodifiedAsync(e.OldId, e.LastWrite);
}
catch (Exception ex)
{
if (ex.IsRetiredException())
{
throw;
}
Logging.Log.WriteWarningMessage(FILELOGTAG, "FailedToAddFile", ex, "Failed while attempting to add unmodified file to database: {0}", e.Path);
}
await self.ProgressChannel.WriteAsync(new ProgressEvent()
{
Filepath = e.Path, Length = filestatsize, Type = EventType.FileSkipped
});
continue;
}
// If we have have disabled the filetime check, we do not have the metadata info
// but we want to know if the metadata is potentially changed
if (!isNewFile && DISABLEFILETIMECHECK)
{
var tp = await database.GetMetadataHashAndSizeForFileAsync(e.OldId);
if (tp != null)
{
e.OldMetaSize = tp.Item1;
e.OldMetaHash = tp.Item2;
}
}
// Compute current metadata
e.MetaHashAndSize = SKIPMETADATA ? EMPTY_METADATA : Utility.WrapMetadata(MetadataGenerator.GenerateMetadata(e.Path, e.Attributes, options, snapshot), options);
e.MetadataChanged = !SKIPMETADATA && (e.MetaHashAndSize.Blob.Length != e.OldMetaSize || e.MetaHashAndSize.FileHash != e.OldMetaHash);
// Check if the file is new, or something indicates a change
var filesizeChanged = filestatsize < 0 || e.LastFileSize < 0 || filestatsize != e.LastFileSize;
if (isNewFile || timestampChanged || filesizeChanged || e.MetadataChanged)
{
Logging.Log.WriteVerboseMessage(FILELOGTAG, "CheckFileForChanges", "Checking file for changes {0}, new: {1}, timestamp changed: {2}, size changed: {3}, metadatachanged: {4}, {5} vs {6}", e.Path, isNewFile, timestampChanged, filesizeChanged, e.MetadataChanged, e.LastWrite, e.OldModified);
await self.Output.WriteAsync(e);
}
else
{
Logging.Log.WriteVerboseMessage(FILELOGTAG, "SkipCheckNoMetadataChange", "Skipped checking file, because no metadata was updated {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);
}
await self.ProgressChannel.WriteAsync(new ProgressEvent()
{
Filepath = e.Path, Length = filestatsize, Type = EventType.FileSkipped
});
}
}
}));
}