private async Task ProcessGetFileCmd(CommandHeader cmdHeader)
{
var data = await NetworkHelperSequential.Read <GetFileCommandData>(_networkStream, cmdHeader.PayloadLength);
var ret = new ServerResponse();
var session = SessionStorage.Instance.GetSession(data.SessionId);
if (session == null)
{
ret.ErrorMsg = "Session does not exist";
}
else if (session.Expired)
{
ret.ErrorMsg = "Session has expired";
//Log?.Invoke("Session has expired");
//return ret;
}
else
{
data.RelativeFilePath = PathHelpers.NormalizeRelative(data.RelativeFilePath);
Msg?.Invoke($"Sending '{data.RelativeFilePath}'");
var filePath = Path.Combine(session.BaseDir, data.RelativeFilePath);
var fileLength = new FileInfo(filePath).Length;
var fileLengthBytes = BitConverter.GetBytes(fileLength);
await NetworkHelperSequential.WriteCommandHeader(_networkStream, Commands.GetFileCmd, sizeof(long));
await NetworkHelperSequential.WriteBytes(_networkStream, fileLengthBytes);
await NetworkHelperSequential.WriteFromFileAndHashAsync(_networkStream, filePath, (int)fileLength);
}
}
private async Task <bool> SendFiles(NetworkStream networkStream, List <SyncFileInfo> dataToUpload, SyncDatabase syncDb)
{
foreach (var fileInfo in dataToUpload)
{
var filePath = Path.Combine(_baseDir, fileInfo.RelativePath);
var fileLength = new FileInfo(filePath).Length;
var data = new SendFileCommandData
{
FileLength = fileLength,
SessionId = _sessionId,
RelativeFilePath = fileInfo.RelativePath,
HashStr = syncDb.Files.First(x => x.RelativePath == fileInfo.RelativePath).HashStr,
};
var dataBytes = Serializer.Serialize(data);
await NetworkHelperSequential.WriteCommandHeader(networkStream, Commands.SendFileCmd, dataBytes.Length);
await NetworkHelperSequential.WriteBytes(networkStream, dataBytes);
await NetworkHelperSequential.WriteFromFileAndHashAsync(networkStream, filePath, (int)fileLength);
}
return(true);
}
private async Task <ServerResponse> FinishSession(Stream networkStream, Guid sessionId)
{
var cmdDataBytes = Serializer.Serialize(sessionId);
await NetworkHelperSequential.WriteCommandHeader(networkStream, Commands.FinishSessionCmd, cmdDataBytes.Length);
await NetworkHelperSequential.WriteBytes(networkStream, cmdDataBytes);
var cmdHeader = await NetworkHelperSequential.ReadCommandHeader(networkStream);
if (cmdHeader.Command != Commands.FinishSessionCmd)
{
return new ServerResponseWithData <SyncInfo> {
ErrorMsg = "Wrong command received"
}
}
;
if (cmdHeader.PayloadLength == 0)
{
return new ServerResponseWithData <SyncInfo> {
ErrorMsg = "No data received"
}
}
;
var responseBytes = await NetworkHelperSequential.ReadBytes(networkStream, cmdHeader.PayloadLength);
var response = Serializer.Deserialize <ServerResponse>(responseBytes);
return(response);
}
private async Task <ServerResponseWithData <Guid> > GetSession(Stream networkStream)
{
await NetworkHelperSequential.WriteCommandHeader(networkStream, Commands.GetSessionCmd);
var cmdHeader = await NetworkHelperSequential.ReadCommandHeader(networkStream);
if (cmdHeader.Command != Commands.GetSessionCmd)
{
return(new ServerResponseWithData <Guid> {
ErrorMsg = "Wrong command received"
});
}
if (cmdHeader.PayloadLength == 0)
{
return(new ServerResponseWithData <Guid> {
ErrorMsg = "No data received"
});
}
var responseBytes = await NetworkHelperSequential.ReadBytes(networkStream, cmdHeader.PayloadLength);
var response = Serializer.Deserialize <ServerResponseWithData <Guid> >(responseBytes);
return(response);
}
public static async Task WriteCommandResponse <T>(NetworkStream stream, byte command, T data)
{
var responseBytes = Serializer.Serialize(data);
var length = responseBytes.Length;
await NetworkHelperSequential.WriteCommandHeader(stream, command, length);
await NetworkHelperSequential.WriteBytes(stream, responseBytes);
}
private async Task <bool> ReceiveFiles(Stream networkStream, IEnumerable <SyncFileInfo> dataToDownload, SyncDatabase syncDb)
{
foreach (var fileInfo in dataToDownload)
{
var data = new GetFileCommandData
{
SessionId = _sessionId,
RelativeFilePath = fileInfo.RelativePath,
};
var dataBytes = Serializer.Serialize(data);
await NetworkHelperSequential.WriteCommandHeader(networkStream, Commands.GetFileCmd, dataBytes.Length);
await NetworkHelperSequential.WriteBytes(networkStream, dataBytes);
var cmdHeader = await NetworkHelperSequential.ReadCommandHeader(networkStream);
if (cmdHeader.Command != Commands.GetFileCmd)
{
return(false);
}
if (cmdHeader.PayloadLength == 0)
{
return(false);
}
var fileLengthBytes = await NetworkHelperSequential.ReadBytes(networkStream, cmdHeader.PayloadLength);
var fileLength = BitConverter.ToInt64(fileLengthBytes, 0);
var tmpFilePath = Path.Combine(_newDir, fileInfo.RelativePath);
var newHash = await NetworkHelperSequential.ReadToFileAndHashAsync(networkStream, tmpFilePath, (int)fileLength);
if (!string.Equals(newHash.ToHashString(), fileInfo.HashStr, StringComparison.OrdinalIgnoreCase))
{
throw new InvalidOperationException("File copy error: hash mismatch");
}
_sessionFileHelper.AddNew(fileInfo.RelativePath);
var fi = syncDb.Files.FirstOrDefault(x => x.RelativePath == fileInfo.RelativePath);
if (fi == null)
{
fi = new SyncFileInfo
{
RelativePath = fileInfo.RelativePath,
};
syncDb.Files.Add(fi);
}
fi.HashStr = newHash.ToHashString();
fi.State = SyncFileState.NotChanged;
}
return(true);
}
private async Task <ServerResponseWithData <SyncInfo> > GetSyncList(Stream networkStream, Guid sessionId, List <SyncFileInfo> syncDbFiles)
{
var cmdData = new GetSyncListCommandData
{
SessionId = sessionId,
Files = syncDbFiles,
};
var cmdDataBytes = Serializer.Serialize(cmdData);
await NetworkHelperSequential.WriteCommandHeader(networkStream, Commands.GetSyncListCmd, cmdDataBytes.Length);
await NetworkHelperSequential.WriteBytes(networkStream, cmdDataBytes);
var cmdHeader = await NetworkHelperSequential.ReadCommandHeader(networkStream);
if (cmdHeader.Command != Commands.GetSyncListCmd)
{
return new ServerResponseWithData <SyncInfo> {
ErrorMsg = "Wrong command received"
}
}
;
if (cmdHeader.PayloadLength == 0)
{
return new ServerResponseWithData <SyncInfo> {
ErrorMsg = "No data received"
}
}
;
var responseBytes = await NetworkHelperSequential.ReadBytes(networkStream, cmdHeader.PayloadLength);
var response = Serializer.Deserialize <ServerResponseWithData <SyncInfo> >(responseBytes);
return(response);
}
public async Task Sync()
{
try
{
using (var client = new TcpClient())
{
await client.ConnectAsync(IPAddress.Parse(_serverAddress), _serverPort);
using (var networkStream = client.GetStream())
{
var sessionId = await GetSession(networkStream);
if (sessionId.HasError)
{
Log?.Invoke($"Unable to create sync session. Server response was '{sessionId.ErrorMsg}'");
return;
}
_sessionId = sessionId.Data;
if (!Directory.Exists(_syncDbDir))
{
var dirInfo = Directory.CreateDirectory(_syncDbDir);
dirInfo.Attributes = dirInfo.Attributes | FileAttributes.Hidden;
}
var syncDb = GetLocalSyncDb(out var error);
if (syncDb == null)
{
Log?.Invoke(error);
return;
}
var syncList = await GetSyncList(networkStream, _sessionId, syncDb.Files);
if (syncList.HasError)
{
Log?.Invoke($"Unable to get sync list. Server response was '{syncList.ErrorMsg}'");
return;
}
PathHelpers.NormalizeRelative(syncList.Data.ToDownload, syncList.Data.ToUpload, syncList.Data.ToRemove);
PathHelpers.EnsureDirExists(_toRemoveDir);
PathHelpers.EnsureDirExists(_newDir);
foreach (var fileInfo in syncList.Data.ToRemove)
{
_sessionFileHelper.PrepareForRemove(fileInfo.RelativePath);
var fi = syncDb.Files.First(x => x.RelativePath == fileInfo.RelativePath);
syncDb.Files.Remove(fi);
}
if (syncList.Data.Conflicts.Count > 0)
{
Debugger.Break();
}
if (!await ReceiveFiles(networkStream, syncList.Data.ToDownload, syncDb))
{
return;
}
if (!await SendFiles(networkStream, syncList.Data.ToUpload, syncDb))
{
return;
}
var response = await FinishSession(networkStream, _sessionId);
if (response.HasError)
{
Log?.Invoke($"Error finishing session. Server response was '{response.ErrorMsg}'");
return;
}
_sessionFileHelper.FinishSession();
syncDb.Files.RemoveAll(x => x.State == SyncFileState.Deleted);
syncDb.Store(_syncDbDir);
File.WriteAllText(Path.Combine(_syncDbDir, $"sync-{DateTime.Now:dd-MM-yyyy_hh-mm-ss}.log"), _log.ToString());
if (new DirectoryInfo(_newDir).EnumerateFiles("*", SearchOption.AllDirectories).Any())
{
Debugger.Break(); // all files should be removed by now
}
if (new DirectoryInfo(_toRemoveDir).EnumerateFiles("*", SearchOption.AllDirectories).Any())
{
Debugger.Break(); // all files should be removed by now
}
Directory.Delete(_newDir, true);
Directory.Delete(_toRemoveDir, true);
await NetworkHelperSequential.WriteCommandHeader(networkStream, Commands.DisconnectCmd);
}
}
}
catch (Exception e)
{
Log?.Invoke($"Error during sync {e}");
}
}
