public ServerException(DtpException exception)
: base(
$"Remote connection threw an error when executing function \"{exception.FunctionName}\": {exception.Message}", new Exception(exception.Message)
)
{
ServerMessage =
$"Function name: {exception.FunctionName}\r\nParameters: {(string.IsNullOrEmpty(exception.ParameterInformation) ? "null" : exception.ParameterInformation)}\r\n" +
exception.StackTrace + "\r\n--------- FINISH SERVER STACK TRACE ---------\r\n";
var field = typeof(Exception).GetField("_remoteStackTraceString", BindingFlags.NonPublic | BindingFlags.Instance);
field.SetValue(this, ServerMessage); //change stack trace with a small hack
}
/// <summary>
/// Process the received data from a <see cref="DtpFactory" />
/// </summary>
/// <param name="data">The data which was given using the <see cref="DtpFactory.SendDataAction" /> delegate</param>
/// <param name="start">The start position of the byte array</param>
/// <returns>Returns the response which must get processed in <see cref="DtpFactory.Receive" /></returns>
public byte[] Receive(byte[] data, int start)
{
data = LZF.Decompress(data, start);
var functionNameLength = BitConverter.ToInt32(data, 16);
var functionName = Encoding.UTF8.GetString(data, 20, functionNameLength);
if (!_procedures.ContainsKey(functionName) && !_functions.ContainsKey(functionName))
{
ExceptionOccurred?.Invoke(this,
new UnhandledExceptionEventArgs(
new InvalidOperationException($"Method with name {functionName} not found")));
var errorResponse = new byte[16 + functionNameLength];
Array.Copy(DtpFactory.FunctionNotFoundExceptionGuid.ToByteArray(), errorResponse, 16);
Array.Copy(data, 20, errorResponse, 16, functionNameLength);
return(errorResponse);
}
var parameterCount = BitConverter.ToInt32(data, 20 + functionNameLength);
var parameterLengths = new List <int>();
var parameters = new Dictionary <int, byte[]>();
for (int i = 0; i < parameterCount; i++)
{
parameterLengths.Add(BitConverter.ToInt32(data, 24 + functionNameLength + i * 4));
}
var offset = 0;
for (int i = 0; i < parameterCount; i++)
{
var parameterData = new byte[parameterLengths[i]];
Array.Copy(data, 24 + functionNameLength + parameterCount * 4 + offset, parameterData, 0,
parameterData.Length);
parameters.Add(i, parameterData);
offset += parameterData.Length;
}
var dtpParameters = new DtpParameters(parameters);
byte[] result = null;
try
{
DtpProcedure procedure;
if (_procedures.TryGetValue(functionName, out procedure))
{
procedure.Invoke(dtpParameters);
}
else
{
DtpFunction function;
if (_functions.TryGetValue(functionName, out function))
{
var returnedObject = function.Invoke(dtpParameters);
if (returnedObject != null)
{
var typeList = new List <Type> {
returnedObject.GetType()
};
Type[] specialTypes;
if (_specialTypes.TryGetValue(functionName, out specialTypes))
{
typeList.AddRange(specialTypes);
}
result = new Serializer(typeList).Serialize(returnedObject);
}
}
}
}
catch (Exception ex)
{
var exception = new DtpException
{
Message = ex.Message,
StackTrace = ex.StackTrace,
FunctionName = functionName,
ParameterInformation = string.Join(", ",
parameters.Select(x => x.Key + " - " + x.Value.Length + " B").ToArray()),
SessionGuid = new Guid(data.Take(16).ToArray())
};
var exceptionData = new Serializer(typeof(DtpException)).Serialize(exception);
var errorResponse = new byte[16 + exceptionData.Length];
Array.Copy(DtpFactory.ExceptionGuid.ToByteArray(), errorResponse, 16);
Array.Copy(exceptionData, 0, errorResponse, 16, exceptionData.Length);
ExceptionOccurred?.Invoke(this, new UnhandledExceptionEventArgs(ex));
return(LZF.Compress(errorResponse, 0));
}
var response = new byte[16 + 4 + (result?.Length ?? 0)];
//Protocol
//HEAD - 16 Bytes - Guid
//HEAD - 4 Bytes - Response Length
//DATA - result.Length - Result Length
Array.Copy(data, 0, response, 0, 16); //copy guid
Array.Copy(BitConverter.GetBytes(result?.Length ?? 0), 0, response, 16, 4);
if (result != null)
{
Array.Copy(result, 0, response, 20, result.Length);
}
return(LZF.Compress(response, 0));
}
