cardmarketbot/ConsoleApp3/CheckSevDeskPublicList.cs

using ConsoleApp3.Contracts;
using OpenQA.Selenium.DevTools;
using OpenQA.Selenium.Support.UI;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Net.Sockets;
using System.Text;
using System.Threading.Tasks;

namespace CardMarketBot
{
    internal class CheckSevDeskPublicList : ICheckSevDesk
    {
        private static readonly object _lock = new object();
        private static bool _closed;

        enum EResult
        {
            FAILED,
            AVAIBLE,
            OK,
            WRITTEN
        }
        private static void Write(TcpClient client, string str)
        {
            try
            {
                SocketShutdown reason = SocketShutdown.Send;
                lock (_lock)
                {
                    BinaryWriter writer = new BinaryWriter(client.GetStream());
                    writer.Write(str);
                    if (_closed)
                    {
                        reason = SocketShutdown.Both;
                    }
                }
                //client.Client.Shutdown(reason);
            }
            catch (IOException e)
            {
                Console.WriteLine($"IOException writing to socket: {e.Message}");
            }
        }

        private static EResult Read(TcpClient client)
        {
            try
            {
                //while(true)
                //{
                try
                {
                    if (!client.Connected)
                    {
                        lock (_lock)
                        {
                            _closed = true;
                            //break;
                        }
                    }
                    BinaryReader reader = new BinaryReader(client.GetStream());
                    string res = reader.ReadString();
                    if (res.Contains("OK"))
                        return EResult.OK;
                    return EResult.FAILED;
                }
                catch (EndOfStreamException)
                {
                    lock (_lock)
                    {
                        _closed = true;
                    }
                    return EResult.FAILED;
                }
                //client.Client.Shutdown(SocketShutdown.Receive);
                //}
            }
            catch (IOException e)
            {
                Console.WriteLine(e.Message);
                return EResult.FAILED;
            }
        }


        public bool AlreadyKnown(string verkaufsnummer)
        {
            try
            {
                TcpClient client = new TcpClient("nas.cosysda.de", 4000);
                Write(client, string.Format("#TEST#{0}", verkaufsnummer));
                EResult result = Read(client);

                client.Client.Shutdown(SocketShutdown.Both);
                client.Close();

                return result == EResult.OK;
            }
            catch(SocketException e)
            {
                throw new SocketException();
            }
        }

        public bool Write(string verkaufsnummer)
        {
            TcpClient client = new TcpClient("nas.cosysda.de", 4000);
            Write(client, string.Format("#WRITE#{0}", verkaufsnummer));
            EResult result = Read(client);
            client.Client.Shutdown(SocketShutdown.Both);
            client.Close();
            return result == EResult.OK;
        }
    }
}