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
});
}
}
}));
}
/// <summary>
/// Processes the metadata for the given path.
/// </summary>
/// <returns><c>True</c> if the path should be submitted to more analysis, <c>false</c> if there is nothing else to do</returns>
private static async Task <bool> ProcessMetadata(string path, FileAttributes attributes, DateTime lastwrite, Options options, Snapshots.ISnapshotService snapshot, IMetahash emptymetadata, BackupDatabase database, IWriteChannel <StreamBlock> streamblockchannel)
{
if (snapshot.IsSymlink(path, attributes))
{
// Not all reparse points are symlinks.
// For example, on Windows 10 Fall Creator's Update, the OneDrive folder (and all subfolders)
// are reparse points, which allows the folder to hook into the OneDrive service and download things on-demand.
// If we can't find a symlink target for the current path, we won't treat it as a symlink.
string symlinkTarget = snapshot.GetSymlinkTarget(path);
if (!string.IsNullOrWhiteSpace(symlinkTarget))
{
if (options.SymlinkPolicy == Options.SymlinkStrategy.Ignore)
{
Logging.Log.WriteVerboseMessage(FILELOGTAG, "IgnoreSymlink", "Ignoring symlink {0}", path);
return(false);
}
if (options.SymlinkPolicy == Options.SymlinkStrategy.Store)
{
var metadata = MetadataGenerator.GenerateMetadata(path, attributes, options, snapshot);
if (!metadata.ContainsKey("CoreSymlinkTarget"))
{
metadata["CoreSymlinkTarget"] = symlinkTarget;
}
var metahash = Utility.WrapMetadata(metadata, options);
await AddSymlinkToOutputAsync(path, DateTime.UtcNow, metahash, database, streamblockchannel).ConfigureAwait(false);
Logging.Log.WriteVerboseMessage(FILELOGTAG, "StoreSymlink", "Stored symlink {0}", path);
// Don't process further
return(false);
}
}
else
{
Logging.Log.WriteVerboseMessage(FILELOGTAG, "FollowingEmptySymlink", "Treating empty symlink as regular path {0}", path);
}
}
if ((attributes & FileAttributes.Directory) == FileAttributes.Directory)
{
IMetahash metahash;
if (!options.SkipMetadata)
{
metahash = Utility.WrapMetadata(MetadataGenerator.GenerateMetadata(path, attributes, options, snapshot), options);
}
else
{
metahash = emptymetadata;
}
Logging.Log.WriteVerboseMessage(FILELOGTAG, "AddDirectory", "Adding directory {0}", path);
await AddFolderToOutputAsync(path, lastwrite, metahash, database, streamblockchannel).ConfigureAwait(false);
return(false);
}
// Regular file, keep going
return(true);
}
public static Task Run(Snapshots.ISnapshotService snapshot, Options options, BackupStatsCollector stats, BackupDatabase database)
{
return(AutomationExtensions.RunTask(
new
{
Input = Channels.ProcessedFiles.ForRead,
Output = Channels.AcceptedChangedFile.ForWrite
},
async self =>
{
var EMPTY_METADATA = Utility.WrapMetadata(new Dictionary <string, string>(), options);
var blocksize = options.Blocksize;
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 tp read size of file: {0}", e.Path);
}
await stats.AddExaminedFile(filestatsize);
e.MetaHashAndSize = options.StoreMetadata ? Utility.WrapMetadata(await MetadataGenerator.GenerateMetadataAsync(e.Path, e.Attributes, options, snapshot), options) : EMPTY_METADATA;
var timestampChanged = e.LastWrite != e.OldModified || e.LastWrite.Ticks == 0 || e.OldModified.Ticks == 0;
var filesizeChanged = filestatsize < 0 || e.LastFileSize < 0 || filestatsize != e.LastFileSize;
var tooLargeFile = options.SkipFilesLargerThan != long.MaxValue && options.SkipFilesLargerThan != 0 && filestatsize >= 0 && filestatsize > options.SkipFilesLargerThan;
e.MetadataChanged = !options.CheckFiletimeOnly && !options.SkipMetadata && (e.MetaHashAndSize.Blob.Length != e.OldMetaSize || e.MetaHashAndSize.FileHash != e.OldMetaHash);
if ((e.OldId < 0 || options.DisableFiletimeCheck || timestampChanged || filesizeChanged || e.MetadataChanged) && !tooLargeFile)
{
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, e.OldId <= 0, timestampChanged, filesizeChanged, e.MetadataChanged, e.LastWrite, e.OldModified);
await self.Output.WriteAsync(e);
}
else
{
if (tooLargeFile)
{
Logging.Log.WriteVerboseMessage(FILELOGTAG, "SkipCheckTooLarge", "Skipped checking file, because the size exceeds limit {0}", e.Path);
}
else
{
Logging.Log.WriteVerboseMessage(FILELOGTAG, "SkipCheckNoTimestampChange", "Skipped checking file, because timestamp was not updated {0}", e.Path);
}
await database.AddUnmodifiedAsync(e.OldId, e.LastWrite);
}
}
}));
}
