public async Task Handle(TcpClient client, CancellationToken cancellationToken = default)
{
using var _ = client;
client.ReceiveTimeout = (int)ReceiveTimeout.TotalMilliseconds;
using var stream = client.GetStream();
// TODO: SSL 지원하기
// using var stream = new SslStream(client.GetStream(), false);
using var reader = new StreamReader(stream, Encoding.ASCII, leaveOpen: true);
await using var writer = new StreamWriter(stream, Encoding.ASCII, leaveOpen: true)
{
AutoFlush = true,
NewLine = ControlChars.CrLf,
};
using var scope = _scopeFactory.CreateScope();
var session = new Pop3Session(client, reader, writer,
scope.ServiceProvider.GetRequiredService <IMediator>(),
scope.ServiceProvider.GetService <ILogger <Pop3Session> >());
var sessionHandler = scope.ServiceProvider.GetRequiredService <Pop3SessionHandler>();
try
{
await sessionHandler.Handle(session, cancellationToken);
}
catch (Exception ex)
{
_logger.LogError(ex, "{EndPoint} - Error handling a session", session.EndPoint);
}
}
public async Task Handle(Pop3Session session, CancellationToken cancellationToken = default)
{
await session.Start();
var buffer = new char[256];
while
(
!cancellationToken.IsCancellationRequested &&
session.Client.Connected
)
{
// Socket.ReceiveTimeout 은 ReadAsync 에서는 효과 없으니까 Read 사용하자
// https://docs.microsoft.com/en-us/dotnet/api/system.net.sockets.socket.receivetimeout?view=net-5.0#remarks
var received = await Task.Run(() => session.Reader.Read(buffer), cancellationToken);
_logger.LogInformation("{EndPoint} - Read {received} bytes", session.EndPoint, received);
if (received == 0)
{
return;
}
var(command, arguments) = GetMessage(buffer[..received]);