Пример #1
0
        private async Task StartSessionAsync(int millisecondsTimeout)
        {
            await OpenSocketAsync(millisecondsTimeout);

            _writeBuffer = new WriteBuffer(_awaitableSocket);
            _readBuffer  = new ReadBuffer(_awaitableSocket);

            await WriteStartupAsync();

            await _readBuffer.ReceiveAsync();

read:

            var message = _readBuffer.ReadMessage();

            switch (message.Type)
            {
            case MessageType.AuthenticationRequest:
            {
                var authenticationRequestType
                    = (AuthenticationRequestType)_readBuffer.ReadInt();

                switch (authenticationRequestType)
                {
                case AuthenticationRequestType.AuthenticationOk:
                {
                    return;
                }

                case AuthenticationRequestType.AuthenticationMD5Password:
                {
                    var salt = _readBuffer.ReadBytes(4);
                    var hash = Hashing.CreateMD5(_password, _user, salt);

                    await _writeBuffer
                    .StartMessage('p')
                    .WriteBytes(hash)
                    .EndMessage()
                    .FlushAsync();

                    await _readBuffer.ReceiveAsync();

                    goto read;
                }

                default:
                    throw new NotImplementedException(authenticationRequestType.ToString());
                }
            }

            case MessageType.ErrorResponse:
                throw new InvalidOperationException(_readBuffer.ReadErrorMessage());

            case MessageType.BackendKeyData:
            case MessageType.EmptyQueryResponse:
            case MessageType.ParameterStatus:
            case MessageType.ReadyForQuery:
                throw new NotImplementedException($"Unhandled MessageType '{message.Type}'");

            default:
                throw new InvalidOperationException($"Unexpected MessageType '{message.Type}'");
            }
        }