Initial commit

.gitignore

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+/.vs/
+/CardMarketServer/bin
+/CardMarketServer/obj/

CardMarketServer.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.6.33829.357
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "CardMarketServer", "CardMarketServer\CardMarketServer.csproj", "{1A5EEA3B-ED7F-4D5F-91D5-74501DD74E1E}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{1A5EEA3B-ED7F-4D5F-91D5-74501DD74E1E}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{1A5EEA3B-ED7F-4D5F-91D5-74501DD74E1E}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{1A5EEA3B-ED7F-4D5F-91D5-74501DD74E1E}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{1A5EEA3B-ED7F-4D5F-91D5-74501DD74E1E}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {66DB3E2E-EAA6-4E84-AF2B-E1C9D1CAC340}
+	EndGlobalSection
+EndGlobal

CardMarketServer/CardMarketServer.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net7.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <None Update="usedList.csv">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
+
+</Project>

CardMarketServer/IUsedRepository.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace CardMarketServer
+{
+    internal interface IUsedRepository
+    {
+        List<string> Query { get; }
+        void Insert(string bestellungid);
+    }
+}

CardMarketServer/Program.cs

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+using System.Net;
+using System.Net.Sockets;
+
+namespace CardMarketServer
+{
+    internal class Program
+    {
+        private static object _lock = new object();
+        private static readonly List<TcpClient> _clients = new List<TcpClient>();
+
+        public static TcpClient[] GetClients()
+        {
+            lock(_lock ) return _clients.ToArray();
+        }
+
+        public static int GetClientCount()
+        {
+            lock(_lock) return _clients.Count;
+        }
+
+        public static void RemoveClient(TcpClient client)
+        {
+            lock(_lock) _clients.Remove(client);
+        }
+
+        public static void AddClient(TcpClient client)
+        {
+            lock(_lock) _clients.Add(client);
+        }
+        static void Main(string[] args)
+        {
+            IPAddress ip = IPAddress.Parse("0.0.0.0");
+            TcpListener ServerSocket = new TcpListener(ip, 4000);
+            ServerSocket.Start();
+            Console.WriteLine("Server started");
+            while(true)
+            {
+                TcpClient clientSocket = ServerSocket.AcceptTcpClient();
+                Console.WriteLine($"Client connected: {clientSocket.Client.RemoteEndPoint}");
+                AddClient(clientSocket);
+                handleClient client = new handleClient();
+                client.startClient(clientSocket);
+
+                Console.WriteLine($"{GetClientCount()} clients connected");
+            }
+        }
+    }
+}

CardMarketServer/UsedRepository.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace CardMarketServer
+{
+    internal class UsedRepository : IUsedRepository
+    {
+        const string FILENAME = "usedList.csv";
+        public List<string> Query => File
+            .ReadLines(FILENAME)
+            .Select(l => l.Split(','))
+            .Select(p => new string(p[0]))
+            .ToList();
+
+        void insert(string key)
+        {
+            key += Environment.NewLine;
+            File.AppendAllText(FILENAME,key);
+        }
+
+        public void Insert(string bestellungid)
+        {
+            insert(bestellungid);
+        }
+    }
+}

CardMarketServer/handleClient.cs

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+using System.Diagnostics;
+using System.Net.Sockets;
+
+namespace CardMarketServer
+{
+    internal class handleClient
+    {
+        TcpClient clientSocket;
+        List<string> bereitsBearbeitet= new List<string>();
+        IUsedRepository repository;
+        public handleClient()
+        {
+            repository = new UsedRepository();
+            bereitsBearbeitet = repository.Query;
+        }
+
+        internal void startClient(TcpClient clientSocket)
+        {
+            this.clientSocket = clientSocket;
+            Thread ctThread = new Thread(Chat);
+            ctThread.Start();
+        }
+        enum EACTION
+        {
+            NONE,
+            TEST,
+            WRITE
+        }
+        private void Chat()
+        {
+            BinaryReader reader = new BinaryReader(clientSocket.GetStream());
+            try
+            {
+                while (true)
+                {
+                    string message = reader.ReadString();
+                    
+                    if (message != null)
+                    {
+                        EACTION action = EACTION.NONE;
+                        string[] parts = message.Split('#');
+                        if(parts.Length < 3)
+                        {
+                            Console.WriteLine("fehler");
+                        }
+                        if (parts[1].Equals("TEST")) action = EACTION.TEST;
+                        if (parts[1].Equals("WRITE")) action = EACTION.WRITE;
+
+                        BinaryWriter writer = new BinaryWriter(clientSocket.GetStream());
+                        if (action == EACTION.TEST)
+                        {
+                            Console.Write($"Test for {parts[2]} : ");
+                            if (bereitsBearbeitet.Find(x => x.Equals(parts[2])) != null)
+                            {
+                                Console.WriteLine("Eintrag bereits vorhanden");
+                                writer.Write("FAILED");
+                            }
+                            else
+                            {
+                                Console.WriteLine("Eintrag noch nicht vorhanden");
+                                writer.Write("OK");
+                            }
+                        }
+                        if(action == EACTION.WRITE)
+                        {
+                            repository.Insert(parts[2]);
+                            writer.Write("OK");
+                        }
+                        Console.WriteLine(message);
+                    }
+                    
+                }
+            }
+            catch(EndOfStreamException)
+            {
+                Console.WriteLine("Client diconnecting");
+                clientSocket.Client.Shutdown(SocketShutdown.Both);
+            }
+            catch(IOException e)
+            {
+                Console.WriteLine($"IOException reading from {clientSocket.Client.RemoteEndPoint}: {e.Message}");
+            }
+
+            clientSocket.Close();
+            Program.RemoveClient(clientSocket);
+            Console.WriteLine($"{Program.GetClientCount()} clients connected");
+        }
+    }
+}

CardMarketServer/usedList.csv

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+