private async Task SendResponse(byte[] messageBuilder, CancellationToken cancellationToken)
{
cancellationToken.ThrowIfCancellationRequested();
var s = _encoding.GetString(messageBuilder);
var message = new Hl7Message(s, _client.Client.RemoteEndPoint.ToString());
var result = await _middleware.Handle(message).ConfigureAwait(false);
await WriteToStream(result, cancellationToken).ConfigureAwait(false);
}
/// <summary>
/// Handles the passed <see cref="Hl7Message"/> message.
/// </summary>
/// <param name="message">The <see cref="Hl7Message"/> to handle.</param>
/// <param name="cancellation"></param>
/// <returns>An HL7 response as a <see cref="string"/>.</returns>
public async Task <IMessage> Handle(
Hl7Message message,
CancellationToken cancellation = default)
{
cancellation.ThrowIfCancellationRequested();
var structureName = message.Message.GetStructureName();
var handler = _handlers[message.Message.Version + structureName];
var response = await handler.Handle(message.Message, cancellation).ConfigureAwait(false);
return(response);
}
/// <summary>
/// Reads the stream and returns the received message.
/// </summary>
/// <param name="cancellationToken">The cancellation token.</param>
/// <exception cref="Exception">When none expected characters are received.</exception>
private void ReadStream(CancellationToken cancellationToken)
{
try
{
byte previous = 0;
this.readingStream = true;
var messageBuilder = new List <byte>();
while (this.IsConnectionEstablished())
{
cancellationToken.ThrowIfCancellationRequested();
var current = (byte)this.stream.ReadByte();
if (Constants.EndBlock.SequenceEqual(new[] { previous, current }))
{
messageBuilder.RemoveAt(messageBuilder.Count - 1);
var responseAsString = this.connectionDetails.Encoding.GetString(messageBuilder.ToArray());
var message = new Hl7Message(responseAsString, this.tcpClient.Client.RemoteEndPoint.ToString());
this.completionSource.SetResult(message);
this.readingStream = false;
break;
}
if (previous == 0 && current == 11)
{
if (messageBuilder.Count > 0)
{
throw new Exception($"Unexpected character: {current:x2}");
}
}
else
{
messageBuilder.Add(current);
previous = current;
}
}
}
catch (IOException io)
{
this.completionSource.SetException(io);
this.readingStream = false;
}
}
private async Task SendResponse(
byte[] messageBuilder,
CancellationToken cancellationToken)
{
cancellationToken.ThrowIfCancellationRequested();
var s = _encoding.GetString(messageBuilder);
var received = _parser.Parse(s);
var message = new Hl7Message(
received,
_client.Client.RemoteEndPoint.ToString());
await _messageLog.Write(s).ConfigureAwait(false);
var result = await _middleware.Handle(message, cancellationToken)
.ConfigureAwait(false);
cancellationToken.ThrowIfCancellationRequested();
string resultMsg = _parser.Encode(result);
await WriteToStream(resultMsg, cancellationToken)
.ConfigureAwait(false);
await _messageLog.Write(resultMsg);
}
private async Task ReadStream(CancellationToken cancellationToken)
{
await Task.Yield();
try
{
byte previous = 0;
var messageBuilder = new List <byte>();
while (!cancellationToken.IsCancellationRequested)
{
var current = (byte)_stream.ReadByte();
cancellationToken.ThrowIfCancellationRequested();
if (Constants.EndBlock.SequenceEqual(
new[] { previous, current }))
{
messageBuilder.RemoveAt(messageBuilder.Count - 1);
var s = _encoding.GetString(messageBuilder.ToArray());
messageBuilder.Clear();
previous = 0;
var msg = _parser.Parse(s);
var message = new Hl7Message(msg, _remoteAddress);
var controlId = msg.GetMessageControlId();
var completionSource = _messages[controlId];
_messages.Remove(controlId);
completionSource.SetResult(message);
continue;
}
if (previous == 0 && current == 11)
{
if (messageBuilder.Count > 0)
{
foreach (var completionSource in _messages.Values)
{
completionSource.SetException(
new Exception(
$"Unexpected character: {current:x2}"));
}
_messages.Clear();
}
}
else
{
messageBuilder.Add(current);
previous = current;
}
}
}
catch (IOException io)
{
Trace.TraceInformation(io.Message);
if (!cancellationToken.IsCancellationRequested)
{
foreach (var completionSource in _messages.Values)
{
completionSource.SetException(io);
}
_messages.Clear();
}
}
}
