/// <summary>
/// Gets the <see cref="RpcResult"/> content of this message or throws an exception, if it
/// is no valid message of this type.
/// <see cref="IsRpcResult"/> can be called before to find out the type of this message.
/// </summary>
public RpcResult DecodeRpcResult()
{
if (false == IsRpcResult())
{
throw new FormatException("Header wrong");
}
try {
int pos = 2;
var ret = new RpcResult();
// ID
ret.MethodID = BitConverter.ToUInt64(Data, pos);
pos += 8;
// Success or failure
bool isSuccess = Data[pos++] == (byte)'S';
if (isSuccess)
{
// Successful
int returnValueLength = BitConverter.ToInt32(Data, pos);
pos += 4;
if (returnValueLength > 0)
{
ret.ReturnValue = new ArraySegment <byte>(Data, pos, returnValueLength).ToArray();
pos += returnValueLength;
}
}
else
{
// Failure
ret.Failure = new RpcFailure();
// Failure type
int failureTypeEnd = Array.FindIndex(Data, pos, it => it == (byte)';');
if (failureTypeEnd == -1)
{
throw new FormatException("FailureType end not found");
}
ret.Failure.Type = Enum.Parse <RpcFailureType>(
Encoding.UTF8.GetString(Data, pos, failureTypeEnd - pos));
pos = failureTypeEnd + 1;
// Message
int messageLength = BitConverter.ToInt32(Data, pos);
pos += 4;
if (messageLength > 0)
{
ret.Failure.Message = Encoding.UTF8.GetString(Data, pos, messageLength);
pos += messageLength;
}
}
return(ret);
} catch (Exception ex) {
throw new FormatException("Content wrong: " + ex.Message, ex);
}
}
/// <summary> /// Call this method as soon as a result was received for this call. /// </summary> public void Finish(RpcResult result) => completionHelper.TrySetResult(result);
/// <summary>
/// Encodes the given RPC result to a RPC message.
/// </summary>
public static RpcMessage Encode(RpcResult result)
{
int length = 2 /* Header */ + 8 /* ID */ + 1 /* Success/Failure */;
byte[]? failureType = null;
int failureMessageLength = 0;
byte[]? failureMessage = null;
int returnValueLength = result.ReturnValue?.Length ?? 0;
if (result.Failure == null)
{
// Successful
length += 4 + returnValueLength; /* Length and data */
}
else
{
// Failure
failureType = Encoding.UTF8.GetBytes("" + result.Failure.Type);
failureMessageLength = result.Failure.Message?.Length ?? 0;
if (failureMessageLength > 0)
{
failureMessage = Encoding.UTF8.GetBytes(result.Failure.Message !);
}
length += failureType.Length + 1 /* ";" */ + 4 + failureMessageLength;
}
byte[] data = new byte[length];
int pos = 0;
data[pos++] = (byte)'1'; // Header
data[pos++] = (byte)'R';
Array.Copy(BitConverter.GetBytes(result.MethodID), 0, data, pos, 8); // ID
pos += 8;
// Success or failure
if (result.Failure == null)
{
// Successful
data[pos++] = (byte)'S';
Array.Copy(BitConverter.GetBytes(returnValueLength), 0, data, pos, 4); // Return value length
pos += 4;
if (returnValueLength > 0)
{
Array.Copy(result.ReturnValue !, 0, data, pos, returnValueLength); // Return value data
pos += returnValueLength;
}
}
else
{
// Failure
data[pos++] = (byte)'F';
Array.Copy(failureType !, 0, data, pos, failureType !.Length); // Failure type
pos += failureType !.Length;
data[pos++] = (byte)';';
Array.Copy(BitConverter.GetBytes(failureMessageLength), 0, data, pos, 4); // Failure message length
pos += 4;
if (failureMessageLength > 0)
{
Array.Copy(failureMessage !, 0, data, pos, failureMessageLength); // Failure message
pos += failureMessageLength;
}
}
return(new RpcMessage {
Data = data
});
}
