public void TestClientIdField()
{
Span <byte> expectedAsHex = stackalloc byte[] { 0x21, 0x22, 0x23, 0x24 };
ClientId expected = ClientId.ReadFrom(expectedAsHex);
Assert.Equal(expected, ClientServerMessage.GetClientId(_bytes));
Assert.Throws <ArgumentException>(() => ClientServerMessage.GetClientId(new Span <byte>(_bytes, 0, 11)));
}
// TODO: [vermorel] Almost but not quite like other 'Iterator' in solution. Align designs.
/// <summary>
/// Provides the next unread message.
/// </summary>
/// <remarks>
/// Returned span is only valid until the next call to
/// <see cref="ReceiveNext"/>.
/// </remarks>
public Span <byte> ReceiveNext()
{
// Delete first message and copy everything else to the beginning
var length = InputMessageLength();
if (length > 0)
{
Array.Copy(_bufferIn, length, _bufferIn, 0, _endIn - length);
_endIn -= length;
}
// Try to receive more data from socket
if (IsConnected && 0 != _socket.Available() && _bufferIn.Length != _endIn)
{
_endIn += _socket.Receive(new Span <byte>(_bufferIn).Slice(_endIn));
}
length = InputMessageLength();
if (length > 0)
{
var message = new Span <byte>(_bufferIn, 0, length);
var messageStatus = PassesVerifications(message);
if (messageStatus != MessageType.EverythingOk)
{
switch (messageStatus)
{
case MessageType.ClientIdFieldNotEmpty:
new Span <byte>(_errorSpan).EmitClientIdFieldNotEmpty(message);
_socket.Send(_errorSpan);
// see whether a valid message is waiting in the inbox
return(ReceiveNext());
}
}
else // write client ID into message
{
ConnectionId.WriteTo(message.Slice(8));
}
return(new Span <byte>(_bufferIn, 0, length));
}
else
{
return(Span <byte> .Empty);
}
// TODO: [vermorel] The intent of this method must be clarified.
MessageType PassesVerifications(Span <byte> message)
{
// Maybe other verifications are going to be added over time
if (message.Length >= ClientServerMessage.PayloadStart && ClientServerMessage.GetClientId(message).IsSpecified)
{
return(MessageType.ClientIdFieldNotEmpty);
}
return(MessageType.EverythingOk);
}
}
public void SendResponses()
{
var toSend = _outbox.Peek();
while (toSend.Length != 0)
{
if (_activeConnections.TryGetValue(ClientServerMessage.GetClientId(toSend), out var client))
{
client.TryWrite(toSend);
}
_outbox.Next();
toSend = _outbox.Peek();
}
}
