private void EvaluateLocallyAbsentFilesAndDirs(SyncedDirectory syncedDirectory)
{
//evaluate the files first (needed to evaluate the dir)
foreach (var syncedFile in syncedDirectory.Files.Where(x => x.LocallyAbsent && !x.RemoteDeleted).ToArray())
{
//if this file was present on the last sync, it's really deleted, otherwise it is new on the remote side
syncedFile.LocallyDeleted = syncedFile.TimestampOnLastSync.Local.HasValue;
if (!syncedFile.LocallyDeleted)
{
//remote new, construct local directory
syncedFile.LocalDirectory = Path.Combine(_fileRepository.StorageDirectory, syncedDirectory.GetRelativePath());
}
}
if (syncedDirectory.LocallyAbsent)
{
var shouldLive = syncedDirectory.Files.Any(x => !x.LocallyDeleted);
syncedDirectory.LocallyDeleted = !shouldLive;
}
foreach (var subDir in syncedDirectory.SubDirectories)
{
EvaluateLocallyAbsentFilesAndDirs(subDir);
}
}
private void EvaluateLocallyAbsentFilesAndDirs(SyncedDirectory syncedDirectory)
{
//evaluate the files first (needed to evaluate the dir)
foreach (var syncedFile in syncedDirectory.Files.Where(x => x.LocallyAbsent && !x.RemoteDeleted).ToArray())
{
//if this file was present on the last sync, it's really deleted, otherwise it is new on the remote side
syncedFile.LocallyDeleted = syncedFile.TimestampOnLastSync.Local.HasValue;
if (!syncedFile.LocallyDeleted)
{
//remote new, construct local directory
syncedFile.LocalDirectory = Path.Combine(_fileRepository.StorageDirectory, syncedDirectory.GetRelativePath());
}
}
if (syncedDirectory.LocallyAbsent)
{
var shouldLive = syncedDirectory.Files.Any(x => !x.LocallyDeleted);
syncedDirectory.LocallyDeleted = !shouldLive;
}
foreach (var subDir in syncedDirectory.SubDirectories)
{
EvaluateLocallyAbsentFilesAndDirs(subDir);
}
}
/// <summary>
/// merge state from local directory into the current state.
/// </summary>
private static void CopyInfoFromLocalState(SyncedDirectory localState, SyncedDirectory myState)
{
//recursively walk the subdirectories and merge
foreach (var mySubDir in myState.SubDirectories)
{
var localSubDirectory = localState.SubDirectories.FirstOrDefault(x => x.NameEquals(mySubDir.Name));
if (localSubDirectory == null)
{
//may be deleted locally, but could also be new on the remote side.
//we don't know yet, this will be re-evaluated later (in this class)
mySubDir.LocallyAbsent = true;
localSubDirectory = new SyncedDirectory();
}
CopyInfoFromLocalState(localSubDirectory, mySubDir);
}
//add directories that don't exist in myState but do exist in localState
//these don't have to be evaluated recursively, because all info is copied immediately by adding the dirs
var dirsOnlyInLocalState = localState.SubDirectories.Where(local => !myState.SubDirectories.Any(my => my.NameEquals(local.Name)));
myState.AddDir(dirsOnlyInLocalState.ToArray());
//merge the files
foreach (var myFile in myState.Files)
{
var localFile = localState.Files.FirstOrDefault(x => x.NameEquals(myFile.Name));
if (localFile == null)
{
//may be deleted locally, but could also be new on the remote side.
//we don't know yet, this will be re-evaluated later
myFile.LocallyAbsent = true;
}
else
{
myFile.CurrentSyncTimestamp.Local = localFile.CurrentSyncTimestamp.Local;
myFile.LocalDirectory = localFile.LocalDirectory;
}
}
//add local files to cloudDirState that don't exist remotely
var filesOnlyInLocalState = localState.Files.Where(local => !myState.Files.Any(my => my.NameEquals(local.Name)));
myState.AddFile(filesOnlyInLocalState.ToArray());
}
/// <summary>
/// recursively evaluate syncstate and destill sync commands
/// </summary>
private IEnumerable <SyncCommand> CreateSyncCommands(SyncedDirectory dir)
{
var result = new List <SyncCommand>();
foreach (var subDir in dir.SubDirectories)
{
result.AddRange(CreateSyncCommands(subDir));
}
foreach (var file in dir.Files)
{
if (GetSyncInfoFileName().Equals(file.Name))
{
continue;
}
var isNewLocally = !file.LocallyAbsent && !file.TimestampOnLastSync.Local.HasValue;
var isNewRemote = file.LocallyAbsent && !file.TimestampOnLastSync.Remote.HasValue;
//local changes go first: remote often has a versioning system in place
if (file.LocallyDeleted)
{
if (!file.RemoteDeleted)
{
result.Add(SyncCommand.DeleteRemote(file));
}
}
else if (file.RemoteDeleted)
{
if (file.LocalPath != null) //may already be deleted locally
{
result.Add(SyncCommand.DeleteLocal(file));
}
}
else if (isNewLocally || file.CurrentSyncTimestamp.Local > file.TimestampOnLastSync.Local)
{
result.Add(SyncCommand.Upload(file));
}
else if (isNewRemote || file.CurrentSyncTimestamp.Remote > file.TimestampOnLastSync.Remote)
{
result.Add(SyncCommand.Download(file));
}
}
return(result);
}
/// <summary>
/// merge info from previous sync into the current state (mainly 'last sync datetime')
/// </summary>
private static void CopyInfoFromPreviousSync(SyncedDirectory prevState, SyncedDirectory myState)
{
foreach (var mySubDir in myState.SubDirectories)
{
var prevSubDir = prevState.SubDirectories.FirstOrDefault(x => x.NameEquals(mySubDir.Name));
prevSubDir = prevSubDir ?? new SyncedDirectory();
CopyInfoFromPreviousSync(prevSubDir, mySubDir);
}
foreach (var myFile in myState.Files)
{
var prevFile = prevState.Files.FirstOrDefault(x => x.NameEquals(myFile.Name));
if (prevFile != null)
{
myFile.TimestampOnLastSync = prevFile.TimestampAfterLastSync;
}
}
}
/// <summary>
/// merge syncinfo from after sync to the properties in the syncinfo
/// </summary>
/// <param name="inputForSync">syncinfo before and during sync</param>
/// <param name="syncStateAfterTheFact">syncinfo after sync</param>
private void CopyCurrentTimestampsToAfterLastSyncFrom(SyncedDirectory inputForSync, SyncedDirectory syncStateAfterTheFact)
{
foreach (var inputDir in inputForSync.SubDirectories)
{
var dirAfterTheFact = syncStateAfterTheFact.SubDirectories.FirstOrDefault(x => x.NameEquals(inputDir.Name));
dirAfterTheFact = dirAfterTheFact ?? new SyncedDirectory(); //apparently removed during sync by another app or manually
CopyCurrentTimestampsToAfterLastSyncFrom(inputDir, dirAfterTheFact);
}
foreach (var inputFile in inputForSync.Files)
{
var fileAfterTheFact = syncStateAfterTheFact.Files.FirstOrDefault(x => x.NameEquals(inputFile.Name));
if (fileAfterTheFact != null)
{
inputFile.TimestampAfterLastSync = fileAfterTheFact.CurrentSyncTimestamp;
}
}
}
/// <summary>
/// merge state from local directory into the current state.
/// </summary>
private static void CopyInfoFromLocalState(SyncedDirectory localState, SyncedDirectory myState)
{
//recursively walk the subdirectories and merge
foreach (var mySubDir in myState.SubDirectories)
{
var localSubDirectory = localState.SubDirectories.FirstOrDefault(x => x.NameEquals(mySubDir.Name));
if (localSubDirectory == null)
{
//may be deleted locally, but could also be new on the remote side.
//we don't know yet, this will be re-evaluated later (in this class)
mySubDir.LocallyAbsent = true;
localSubDirectory = new SyncedDirectory();
}
CopyInfoFromLocalState(localSubDirectory, mySubDir);
}
//add directories that don't exist in myState but do exist in localState
//these don't have to be evaluated recursively, because all info is copied immediately by adding the dirs
var dirsOnlyInLocalState = localState.SubDirectories.Where(local => !myState.SubDirectories.Any(my => my.NameEquals(local.Name)));
myState.AddDir(dirsOnlyInLocalState.ToArray());
//merge the files
foreach (var myFile in myState.Files)
{
var localFile = localState.Files.FirstOrDefault(x => x.NameEquals(myFile.Name));
if (localFile == null)
{
//may be deleted locally, but could also be new on the remote side.
//we don't know yet, this will be re-evaluated later
myFile.LocallyAbsent = true;
}
else
{
myFile.CurrentSyncTimestamp.Local = localFile.CurrentSyncTimestamp.Local;
myFile.LocalDirectory = localFile.LocalDirectory;
}
}
//add local files to cloudDirState that don't exist remotely
var filesOnlyInLocalState = localState.Files.Where(local => !myState.Files.Any(my => my.NameEquals(local.Name)));
myState.AddFile(filesOnlyInLocalState.ToArray());
}
/// <summary>
/// restore sync info from previous sync from disk
/// </summary>
private SyncedDirectory GetPrevSyncInfo()
{
var prevSyncInfoText = _fileRepository.GetText(GetSyncInfoFileName());
var prevSyncInfo = new SyncedDirectory();
if (!string.IsNullOrEmpty(prevSyncInfoText))
{
try
{
prevSyncInfo = JsonConvert.DeserializeObject <SyncedDirectory>(prevSyncInfoText);
}
catch
{
//file is apparently broken: all sync information is lost.
//will be overwritten with new information.
}
}
return(prevSyncInfo);
}
/// <summary>
/// restore sync info from previous sync from disk
/// </summary>
private SyncedDirectory GetPrevSyncInfo()
{
var prevSyncInfoText = _fileRepository.GetText(GetSyncInfoFileName());
var prevSyncInfo = new SyncedDirectory();
if (!string.IsNullOrEmpty(prevSyncInfoText))
{
try
{
prevSyncInfo = JsonConvert.DeserializeObject<SyncedDirectory>(prevSyncInfoText);
}
catch
{
//file is apparently broken: all sync information is lost.
//will be overwritten with new information.
}
}
return prevSyncInfo;
}
/// <summary>
/// Synchronize all files to and from Dropbox
/// </summary>
public async Task Initialize()
{
_syncState = await BuildUpSyncState();
}
/// <summary>
/// Synchronize all files to and from Dropbox
/// </summary>
public async Task Initialize()
{
_syncState = await BuildUpSyncState();
}
/// <summary>
/// merge syncinfo from after sync to the properties in the syncinfo
/// </summary>
/// <param name="inputForSync">syncinfo before and during sync</param>
/// <param name="syncStateAfterTheFact">syncinfo after sync</param>
private void CopyCurrentTimestampsToAfterLastSyncFrom(SyncedDirectory inputForSync, SyncedDirectory syncStateAfterTheFact)
{
foreach (var inputDir in inputForSync.SubDirectories)
{
var dirAfterTheFact = syncStateAfterTheFact.SubDirectories.FirstOrDefault(x => x.NameEquals(inputDir.Name));
dirAfterTheFact = dirAfterTheFact ?? new SyncedDirectory(); //apparently removed during sync by another app or manually
CopyCurrentTimestampsToAfterLastSyncFrom(inputDir, dirAfterTheFact);
}
foreach (var inputFile in inputForSync.Files)
{
var fileAfterTheFact = syncStateAfterTheFact.Files.FirstOrDefault(x => x.NameEquals(inputFile.Name));
if (fileAfterTheFact != null)
{
inputFile.TimestampAfterLastSync = fileAfterTheFact.CurrentSyncTimestamp;
}
}
}
public void CopyInfoFromLocalState(SyncedDirectory localState)
{
CopyInfoFromLocalState(localState, this);
}
private SyncedDirectory GetLocalSyncState(DirectoryInfo dir)
{
var result = new SyncedDirectory { Name = dir.Name };
foreach (var subDir in dir.GetDirectories())
{
result.AddDir(GetLocalSyncState(subDir));
}
foreach (var file in dir.GetFiles())
{
result.AddFile(new SyncedFile
{
Name = file.Name,
LocalDirectory = file.DirectoryName,
CurrentSyncTimestamp = { Local = file.LastWriteTimeUtc }
});
}
return result;
}
public void CopyInfoFromPreviousSync(SyncedDirectory prevState)
{
CopyInfoFromPreviousSync(prevState, this);
}
public void CopyInfoFromPreviousSync(SyncedDirectory prevState)
{
CopyInfoFromPreviousSync(prevState, this);
}
/// <summary>
/// recursively evaluate syncstate and destill sync commands
/// </summary>
private IEnumerable<SyncCommand> CreateSyncCommands(SyncedDirectory dir)
{
var result = new List<SyncCommand>();
foreach (var subDir in dir.SubDirectories)
{
result.AddRange(CreateSyncCommands(subDir));
}
foreach (var file in dir.Files)
{
if (GetSyncInfoFileName().Equals(file.Name))
{
continue;
}
var isNewLocally = !file.LocallyAbsent && !file.TimestampOnLastSync.Local.HasValue;
var isNewRemote = file.LocallyAbsent && !file.TimestampOnLastSync.Remote.HasValue;
//local changes go first: remote often has a versioning system in place
if (file.LocallyDeleted)
{
if (!file.RemoteDeleted)
{
result.Add(SyncCommand.DeleteRemote(file));
}
}
else if (file.RemoteDeleted)
{
if (file.LocalPath != null) //may already be deleted locally
{
result.Add(SyncCommand.DeleteLocal(file));
}
}
else if (isNewLocally || file.CurrentSyncTimestamp.Local > file.TimestampOnLastSync.Local)
{
result.Add(SyncCommand.Upload(file));
}
else if (isNewRemote || file.CurrentSyncTimestamp.Remote > file.TimestampOnLastSync.Remote)
{
result.Add(SyncCommand.Download(file));
}
}
return result;
}
public void CopyInfoFromLocalState(SyncedDirectory localState)
{
CopyInfoFromLocalState(localState, this);
}
/// <summary>
/// merge info from previous sync into the current state (mainly 'last sync datetime')
/// </summary>
private static void CopyInfoFromPreviousSync(SyncedDirectory prevState, SyncedDirectory myState)
{
foreach (var mySubDir in myState.SubDirectories)
{
var prevSubDir = prevState.SubDirectories.FirstOrDefault(x => x.NameEquals(mySubDir.Name));
prevSubDir = prevSubDir ?? new SyncedDirectory();
CopyInfoFromPreviousSync(prevSubDir, mySubDir);
}
foreach (var myFile in myState.Files)
{
var prevFile = prevState.Files.FirstOrDefault(x => x.NameEquals(myFile.Name));
if (prevFile != null)
{
myFile.TimestampOnLastSync = prevFile.TimestampAfterLastSync;
}
}
}
