private void ExecutePushRequest(FilePushRequest filePushRequest)
{
if (filePushRequest.Client.IsDisposed)
{
return;
}
Logger.Debug("Begin execute push request {0:D} of client CI-{1}", filePushRequest.Guid,
filePushRequest.Client.Id);
_activePushes.Add(filePushRequest);
new Thread(() =>
{
try
{
AcceptPushRequest(filePushRequest);
}
catch (Exception)
{
// ignored
}
finally
{
lock (_executionLock)
{
_activePushes.Remove(filePushRequest);
if (_pushRequests.Count > 0 && _activePushes.Count <= _maxActivePushes)
{
var pushRequest = _pushRequests[0];
ExecutePushRequest(pushRequest);
_pushRequests.Remove(pushRequest);
}
}
if (_activePushes.Count == 0 && Directory.Exists("temp"))
{
Directory.Delete("temp", true);
}
}
})
{
Name = $"PushRequest_{filePushRequest.Guid:N}", IsBackground = true
}.Start();
}
public void PushRequest(Guid guid, Client client)
{
Logger.Debug("Push request ({0:N}) received from client CI-{1}", guid, client.Id);
lock (_executionLock)
{
var pushRequest = new FilePushRequest {
Client = client, Guid = guid, Timestamp = DateTime.UtcNow
};
if (_activePushes.Count <= _maxActivePushes)
{
ExecutePushRequest(pushRequest);
}
else
{
_pushRequests.Add(pushRequest);
Logger.Debug("Push request ({0:N}) of CI-{1} must be delayed; active pushes = {2}", guid, client.Id, _activePushes.Count);
}
}
}
private void AcceptPushRequest(FilePushRequest filePushRequest)
{
Logger.Info("File transfer request {0:D} from client CI-{1} accepted", filePushRequest.Guid,
filePushRequest.Client.Id);
using (var autoResetEventHandler = new AutoResetEvent(false))
{
var isFinished = false;
long fileLength = 0;
byte[] fileHash = null;
Guid dataMode = Guid.Empty;
string entryName = null;
var isFile = false;
bool transferSuccessful = false;
Logger.Debug("(PushRequest {0:D}) Create temp directory", filePushRequest.Guid);
var tempDirectory = new DirectoryInfo("temp");
if (!tempDirectory.Exists)
{
tempDirectory.Create();
}
var fileName = Path.Combine(tempDirectory.FullName, filePushRequest.Guid.ToString("N"));
while (File.Exists(fileName))
{
fileName = Path.Combine(tempDirectory.FullName, Guid.NewGuid().ToString("N"));
}
Logger.Debug("(PushRequest {0:D}) Open file stream, path = {1}", filePushRequest.Guid, fileName);
using (var fileStream = new FileStream(fileName, FileMode.CreateNew, FileAccess.ReadWrite))
{
EventHandler <FilePushEventArgs> handler = (s, e) =>
{
if (e.FileTransferGuid != filePushRequest.Guid)
{
return;
}
if (e.PackageType == FilePushPackageType.Header)
{
fileLength = BitConverter.ToInt64(e.Data, 16);
fileHash = new byte[32];
Array.Copy(e.Data, 24, fileHash, 0, 32);
var tempGuid = new byte[16];
Array.Copy(e.Data, 56, tempGuid, 0, 16);
dataMode = new Guid(tempGuid);
isFile = e.Data[72] == 1;
entryName = Encoding.UTF8.GetString(e.Data, 73, e.Data.Length - 73);
Logger.Info(
"Header of file transfer {0:D} from client CI-{1} received: FileLength={2},EntryName='{3}'",
filePushRequest.Guid, filePushRequest.Client.Id, fileLength, entryName);
}
else
{
fileStream.Write(e.Data, 16, e.Data.Length - 16);
if (fileStream.Length == fileLength)
{
isFinished = true;
}
}
autoResetEventHandler.Set();
};
filePushRequest.Client.FilePush += handler;
try
{
var timeout =
int.Parse(
GlobalConfig.Current.IniFile.GetKeyValue("DATA_MANAGER", "WaitTimeout"));
filePushRequest.Client.AcceptPush(filePushRequest.Guid);
while (!isFinished)
{
if (!autoResetEventHandler.WaitOne(timeout))
{
Logger.Debug("(PushRequest {0:D}) Data transfer timed out", filePushRequest.Guid);
return;
}
}
Logger.Debug("(PushRequest {0:D}) Data transfer finished, calculating hash value", filePushRequest.Guid);
fileStream.Position = 0;
using (var sha256 = new SHA256Managed())
{
if (!sha256.ComputeHash(fileStream).SequenceEqual(fileHash))
{
fileStream.Close();
File.Delete(fileName);
Logger.Info(
"Hash comparison of file transfer {0:D} from client CI-{1} failed. Removing files...",
filePushRequest.Guid, filePushRequest.Client.Id);
return;
}
}
Logger.Debug("(PushRequest {0:D}) Hash values match, transfer succeeded", filePushRequest.Guid);
filePushRequest.Client.FileTransferCompleted(filePushRequest.Guid);
Logger.Info("File transfer {0:D} from client CI-{1} completed", filePushRequest.Guid,
filePushRequest.Client.Id);
transferSuccessful = true;
}
catch (Exception)
{
// ignored
}
finally
{
filePushRequest.Client.FilePush -= handler;
}
}
if (!transferSuccessful)
{
Logger.Debug("(PushRequest {0:D}) Remove file", filePushRequest.Guid);
File.Delete(fileName);
}
else
{
var fileNameGuid = DataSystem.StoreFile(fileName);
_databaseManager.AddDataEntry(filePushRequest.Client.Id, fileLength, fileNameGuid, dataMode,
entryName, !isFile);
}
}
}
