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Programming language: C#

License: MIT License

Tags: networking

NetCoreServer alternatives and similar packages

Based on the "Networking" category.
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SharpPcap

6.3 8.9 NetCoreServer VS SharpPcap

Official repository - Fully managed, cross platform (Windows, Mac, Linux) .NET library for capturing packets

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README

NetCoreServer

Ultra fast and low latency asynchronous socket server & client C# .NET Core library with support TCP, SSL, UDP, HTTP, HTTPS, WebSocket protocols and 10K connections problem solution.

NetCoreServer documentation NetCoreServer downloads

Features
Requirements
How to build?
Examples
Performance
OpenSSL certificates

Features

Cross platform (Linux, OSX, Windows)
Asynchronous communication
Supported transport protocols: TCP, SSL, UDP, UDP multicast
Supported Web protocols: HTTP, HTTPS, WebSocket, WebSocket secure
Supported Swagger OpenAPI iterative documentation

Requirements

Linux
OSX
Windows 10
.NET 5.0
7-Zip
cmake
git
Visual Studio

Optional:

Rider

How to build?

Setup repository

git clone https://github.com/chronoxor/NetCoreServer.git
cd NetCoreServer

Linux

cd build
./unix.sh

OSX

cd build
./unix.sh

Windows (Visual Studio)

Open and build NetCoreServer.sln or run the build script:

cd build
vs.bat

The build script will create "release" directory with zip files:

NetCoreServer.zip - C# Server assembly
Benchmarks.zip - C# Server benchmarks
Examples.zip - C# Server examples

Examples

Example: TCP chat server

Here comes the example of the TCP chat server. It handles multiple TCP client sessions and multicast received message from any session to all ones. Also it is possible to send admin message directly from the server.

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using NetCoreServer;

namespace TcpChatServer
{
    class ChatSession : TcpSession
    {
        public ChatSession(TcpServer server) : base(server) {}

        protected override void OnConnected()
        {
            Console.WriteLine($"Chat TCP session with Id {Id} connected!");

            // Send invite message
            string message = "Hello from TCP chat! Please send a message or '!' to disconnect the client!";
            SendAsync(message);
        }

        protected override void OnDisconnected()
        {
            Console.WriteLine($"Chat TCP session with Id {Id} disconnected!");
        }

        protected override void OnReceived(byte[] buffer, long offset, long size)
        {
            string message = Encoding.UTF8.GetString(buffer, (int)offset, (int)size);
            Console.WriteLine("Incoming: " + message);

            // Multicast message to all connected sessions
            Server.Multicast(message);

            // If the buffer starts with '!' the disconnect the current session
            if (message == "!")
                Disconnect();
        }

        protected override void OnError(SocketError error)
        {
            Console.WriteLine($"Chat TCP session caught an error with code {error}");
        }
    }

    class ChatServer : TcpServer
    {
        public ChatServer(IPAddress address, int port) : base(address, port) {}

        protected override TcpSession CreateSession() { return new ChatSession(this); }

        protected override void OnError(SocketError error)
        {
            Console.WriteLine($"Chat TCP server caught an error with code {error}");
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            // TCP server port
            int port = 1111;
            if (args.Length > 0)
                port = int.Parse(args[0]);

            Console.WriteLine($"TCP server port: {port}");

            Console.WriteLine();

            // Create a new TCP chat server
            var server = new ChatServer(IPAddress.Any, port);

            // Start the server
            Console.Write("Server starting...");
            server.Start();
            Console.WriteLine("Done!");

            Console.WriteLine("Press Enter to stop the server or '!' to restart the server...");

            // Perform text input
            for (;;)
            {
                string line = Console.ReadLine();
                if (string.IsNullOrEmpty(line))
                    break;

                // Restart the server
                if (line == "!")
                {
                    Console.Write("Server restarting...");
                    server.Restart();
                    Console.WriteLine("Done!");
                    continue;
                }

                // Multicast admin message to all sessions
                line = "(admin) " + line;
                server.Multicast(line);
            }

            // Stop the server
            Console.Write("Server stopping...");
            server.Stop();
            Console.WriteLine("Done!");
        }
    }
}

Example: TCP chat client

Here comes the example of the TCP chat client. It connects to the TCP chat server and allows to send message to it and receive new messages.

using System;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using TcpClient = NetCoreServer.TcpClient;

namespace TcpChatClient
{
    class ChatClient : TcpClient
    {
        public ChatClient(string address, int port) : base(address, port) {}

        public void DisconnectAndStop()
        {
            _stop = true;
            DisconnectAsync();
            while (IsConnected)
                Thread.Yield();
        }

        protected override void OnConnected()
        {
            Console.WriteLine($"Chat TCP client connected a new session with Id {Id}");
        }

        protected override void OnDisconnected()
        {
            Console.WriteLine($"Chat TCP client disconnected a session with Id {Id}");

            // Wait for a while...
            Thread.Sleep(1000);

            // Try to connect again
            if (!_stop)
                ConnectAsync();
        }

        protected override void OnReceived(byte[] buffer, long offset, long size)
        {
            Console.WriteLine(Encoding.UTF8.GetString(buffer, (int)offset, (int)size));
        }

        protected override void OnError(SocketError error)
        {
            Console.WriteLine($"Chat TCP client caught an error with code {error}");
        }

        private bool _stop;
    }

    class Program
    {
        static void Main(string[] args)
        {
            // TCP server address
            string address = "127.0.0.1";
            if (args.Length > 0)
                address = args[0];

            // TCP server port
            int port = 1111;
            if (args.Length > 1)
                port = int.Parse(args[1]);

            Console.WriteLine($"TCP server address: {address}");
            Console.WriteLine($"TCP server port: {port}");

            Console.WriteLine();

            // Create a new TCP chat client
            var client = new ChatClient(address, port);

            // Connect the client
            Console.Write("Client connecting...");
            client.ConnectAsync();
            Console.WriteLine("Done!");

            Console.WriteLine("Press Enter to stop the client or '!' to reconnect the client...");

            // Perform text input
            for (;;)
            {
                string line = Console.ReadLine();
                if (string.IsNullOrEmpty(line))
                    break;

                // Disconnect the client
                if (line == "!")
                {
                    Console.Write("Client disconnecting...");
                    client.DisconnectAsync();
                    Console.WriteLine("Done!");
                    continue;
                }

                // Send the entered text to the chat server
                client.SendAsync(line);
            }

            // Disconnect the client
            Console.Write("Client disconnecting...");
            client.DisconnectAndStop();
            Console.WriteLine("Done!");
        }
    }
}

Example: SSL chat server

Here comes the example of the SSL chat server. It handles multiple SSL client sessions and multicast received message from any session to all ones. Also it is possible to send admin message directly from the server.

This example is very similar to the TCP one except the code that prepares SSL context and handshake handler.

using System;
using System.Net;
using System.Net.Sockets;
using System.Security.Authentication;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using NetCoreServer;

namespace SslChatServer
{
    class ChatSession : SslSession
    {
        public ChatSession(SslServer server) : base(server) {}

        protected override void OnConnected()
        {
            Console.WriteLine($"Chat SSL session with Id {Id} connected!");
        }

        protected override void OnHandshaked()
        {
            Console.WriteLine($"Chat SSL session with Id {Id} handshaked!");

            // Send invite message
            string message = "Hello from SSL chat! Please send a message or '!' to disconnect the client!";
            Send(message);
        }

        protected override void OnDisconnected()
        {
            Console.WriteLine($"Chat SSL session with Id {Id} disconnected!");
        }

        protected override void OnReceived(byte[] buffer, long offset, long size)
        {
            string message = Encoding.UTF8.GetString(buffer, (int)offset, (int)size);
            Console.WriteLine("Incoming: " + message);

            // Multicast message to all connected sessions
            Server.Multicast(message);

            // If the buffer starts with '!' the disconnect the current session
            if (message == "!")
                Disconnect();
        }

        protected override void OnError(SocketError error)
        {
            Console.WriteLine($"Chat SSL session caught an error with code {error}");
        }
    }

    class ChatServer : SslServer
    {
        public ChatServer(SslContext context, IPAddress address, int port) : base(context, address, port) {}

        protected override SslSession CreateSession() { return new ChatSession(this); }

        protected override void OnError(SocketError error)
        {
            Console.WriteLine($"Chat SSL server caught an error with code {error}");
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            // SSL server port
            int port = 2222;
            if (args.Length > 0)
                port = int.Parse(args[0]);

            Console.WriteLine($"SSL server port: {port}");

            Console.WriteLine();

            // Create and prepare a new SSL server context
            var context = new SslContext(SslProtocols.Tls12, new X509Certificate2("server.pfx", "qwerty"));

            // Create a new SSL chat server
            var server = new ChatServer(context, IPAddress.Any, port);

            // Start the server
            Console.Write("Server starting...");
            server.Start();
            Console.WriteLine("Done!");

            Console.WriteLine("Press Enter to stop the server or '!' to restart the server...");

            // Perform text input
            for (;;)
            {
                string line = Console.ReadLine();
                if (string.IsNullOrEmpty(line))
                    break;

                // Restart the server
                if (line == "!")
                {
                    Console.Write("Server restarting...");
                    server.Restart();
                    Console.WriteLine("Done!");
                    continue;
                }

                // Multicast admin message to all sessions
                line = "(admin) " + line;
                server.Multicast(line);
            }

            // Stop the server
            Console.Write("Server stopping...");
            server.Stop();
            Console.WriteLine("Done!");
        }
    }
}

Example: SSL chat client

Here comes the example of the SSL chat client. It connects to the SSL chat server and allows to send message to it and receive new messages.

This example is very similar to the TCP one except the code that prepares SSL context and handshake handler.

using System;
using System.Net.Sockets;
using System.Security.Authentication;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using System.Threading;
using NetCoreServer;

namespace SslChatClient
{
    class ChatClient : SslClient
    {
        public ChatClient(SslContext context, string address, int port) : base(context, address, port) {}

        public void DisconnectAndStop()
        {
            _stop = true;
            DisconnectAsync();
            while (IsConnected)
                Thread.Yield();
        }

        protected override void OnConnected()
        {
            Console.WriteLine($"Chat SSL client connected a new session with Id {Id}");
        }

        protected override void OnHandshaked()
        {
            Console.WriteLine($"Chat SSL client handshaked a new session with Id {Id}");
        }

        protected override void OnDisconnected()
        {
            Console.WriteLine($"Chat SSL client disconnected a session with Id {Id}");

            // Wait for a while...
            Thread.Sleep(1000);

            // Try to connect again
            if (!_stop)
                ConnectAsync();
        }

        protected override void OnReceived(byte[] buffer, long offset, long size)
        {
            Console.WriteLine(Encoding.UTF8.GetString(buffer, (int)offset, (int)size));
        }

        protected override void OnError(SocketError error)
        {
            Console.WriteLine($"Chat SSL client caught an error with code {error}");
        }

        private bool _stop;
    }

    class Program
    {
        static void Main(string[] args)
        {
            // SSL server address
            string address = "127.0.0.1";
            if (args.Length > 0)
                address = args[0];

            // SSL server port
            int port = 2222;
            if (args.Length > 1)
                port = int.Parse(args[1]);

            Console.WriteLine($"SSL server address: {address}");
            Console.WriteLine($"SSL server port: {port}");

            Console.WriteLine();

            // Create and prepare a new SSL client context
            var context = new SslContext(SslProtocols.Tls12, new X509Certificate2("client.pfx", "qwerty"), (sender, certificate, chain, sslPolicyErrors) => true);

            // Create a new SSL chat client
            var client = new ChatClient(context, address, port);

            // Connect the client
            Console.Write("Client connecting...");
            client.ConnectAsync();
            Console.WriteLine("Done!");

            Console.WriteLine("Press Enter to stop the client or '!' to reconnect the client...");

            // Perform text input
            for (;;)
            {
                string line = Console.ReadLine();
                if (string.IsNullOrEmpty(line))
                    break;

                // Disconnect the client
                if (line == "!")
                {
                    Console.Write("Client disconnecting...");
                    client.DisconnectAsync();
                    Console.WriteLine("Done!");
                    continue;
                }

                // Send the entered text to the chat server
                client.SendAsync(line);
            }

            // Disconnect the client
            Console.Write("Client disconnecting...");
            client.DisconnectAndStop();
            Console.WriteLine("Done!");
        }
    }
}

Example: UDP echo server

Here comes the example of the UDP echo server. It receives a datagram mesage from any UDP client and resend it back without any changes.

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using NetCoreServer;

namespace UdpEchoServer
{
    class EchoServer : UdpServer
    {
        public EchoServer(IPAddress address, int port) : base(address, port) {}

        protected override void OnStarted()
        {
            // Start receive datagrams
            ReceiveAsync();
        }

        protected override void OnReceived(EndPoint endpoint, byte[] buffer, long offset, long size)
        {
            Console.WriteLine("Incoming: " + Encoding.UTF8.GetString(buffer, (int)offset, (int)size));

            // Echo the message back to the sender
            SendAsync(endpoint, buffer, 0, size);
        }

        protected override void OnSent(EndPoint endpoint, long sent)
        {
            // Continue receive datagrams
            ReceiveAsync();
        }

        protected override void OnError(SocketError error)
        {
            Console.WriteLine($"Echo UDP server caught an error with code {error}");
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            // UDP server port
            int port = 3333;
            if (args.Length > 0)
                port = int.Parse(args[0]);

            Console.WriteLine($"UDP server port: {port}");

            Console.WriteLine();

            // Create a new UDP echo server
            var server = new EchoServer(IPAddress.Any, port);

            // Start the server
            Console.Write("Server starting...");
            server.Start();
            Console.WriteLine("Done!");

            Console.WriteLine("Press Enter to stop the server or '!' to restart the server...");

            // Perform text input
            for (;;)
            {
                string line = Console.ReadLine();
                if (string.IsNullOrEmpty(line))
                    break;

                // Restart the server
                if (line == "!")
                {
                    Console.Write("Server restarting...");
                    server.Restart();
                    Console.WriteLine("Done!");
                }
            }

            // Stop the server
            Console.Write("Server stopping...");
            server.Stop();
            Console.WriteLine("Done!");
        }
    }
}

Example: UDP echo client

Here comes the example of the UDP echo client. It sends user datagram message to UDP server and listen for response.

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using UdpClient = NetCoreServer.UdpClient;

namespace UdpEchoClient
{
    class EchoClient : UdpClient
    {
        public EchoClient(string address, int port) : base(address, port) {}

        public void DisconnectAndStop()
        {
            _stop = true;
            Disconnect();
            while (IsConnected)
                Thread.Yield();
        }

        protected override void OnConnected()
        {
            Console.WriteLine($"Echo UDP client connected a new session with Id {Id}");

            // Start receive datagrams
            ReceiveAsync();
        }

        protected override void OnDisconnected()
        {
            Console.WriteLine($"Echo UDP client disconnected a session with Id {Id}");

            // Wait for a while...
            Thread.Sleep(1000);

            // Try to connect again
            if (!_stop)
                Connect();
        }

        protected override void OnReceived(EndPoint endpoint, byte[] buffer, long offset, long size)
        {
            Console.WriteLine("Incoming: " + Encoding.UTF8.GetString(buffer, (int)offset, (int)size));

            // Continue receive datagrams
            ReceiveAsync();
        }

        protected override void OnError(SocketError error)
        {
            Console.WriteLine($"Echo UDP client caught an error with code {error}");
        }

        private bool _stop;
    }

    class Program
    {
        static void Main(string[] args)
        {
            // UDP server address
            string address = "127.0.0.1";
            if (args.Length > 0)
                address = args[0];

            // UDP server port
            int port = 3333;
            if (args.Length > 1)
                port = int.Parse(args[1]);

            Console.WriteLine($"UDP server address: {address}");
            Console.WriteLine($"UDP server port: {port}");

            Console.WriteLine();

            // Create a new TCP chat client
            var client = new EchoClient(address, port);

            // Connect the client
            Console.Write("Client connecting...");
            client.Connect();
            Console.WriteLine("Done!");

            Console.WriteLine("Press Enter to stop the client or '!' to reconnect the client...");

            // Perform text input
            for (;;)
            {
                string line = Console.ReadLine();
                if (string.IsNullOrEmpty(line))
                    break;

                // Disconnect the client
                if (line == "!")
                {
                    Console.Write("Client disconnecting...");
                    client.Disconnect();
                    Console.WriteLine("Done!");
                    continue;
                }

                // Send the entered text to the chat server
                client.Send(line);
            }

            // Disconnect the client
            Console.Write("Client disconnecting...");
            client.DisconnectAndStop();
            Console.WriteLine("Done!");
        }
    }
}

Example: UDP multicast server

Here comes the example of the UDP multicast server. It use multicast IP address to multicast datagram messages to all client that joined corresponding UDP multicast group.

using System;
using System.Net;
using System.Net.Sockets;
using NetCoreServer;

namespace UdpMulticastServer
{
    class MulticastServer : UdpServer
    {
        public MulticastServer(IPAddress address, int port) : base(address, port) {}

        protected override void OnError(SocketError error)
        {
            Console.WriteLine($"Multicast UDP server caught an error with code {error}");
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            // UDP multicast address
            string multicastAddress = "239.255.0.1";
            if (args.Length > 0)
                multicastAddress = args[0];

            // UDP multicast port
            int multicastPort = 3334;
            if (args.Length > 1)
                multicastPort = int.Parse(args[1]);

            Console.WriteLine($"UDP multicast address: {multicastAddress}");
            Console.WriteLine($"UDP multicast port: {multicastPort}");

            Console.WriteLine();

            // Create a new UDP multicast server
            var server = new MulticastServer(IPAddress.Any, 0);

            // Start the multicast server
            Console.Write("Server starting...");
            server.Start(multicastAddress, multicastPort);
            Console.WriteLine("Done!");

            Console.WriteLine("Press Enter to stop the server or '!' to restart the server...");

            // Perform text input
            for (;;)
            {
                string line = Console.ReadLine();
                if (string.IsNullOrEmpty(line))
                    break;

                // Restart the server
                if (line == "!")
                {
                    Console.Write("Server restarting...");
                    server.Restart();
                    Console.WriteLine("Done!");
                    continue;
                }

                // Multicast admin message to all sessions
                line = "(admin) " + line;
                server.Multicast(line);
            }

            // Stop the server
            Console.Write("Server stopping...");
            server.Stop();
            Console.WriteLine("Done!");
        }
    }
}

Example: UDP multicast client

Here comes the example of the UDP multicast client. It use multicast IP address and joins UDP multicast group in order to receive multicasted datagram messages from UDP server.

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using UdpClient = NetCoreServer.UdpClient;

namespace UdpMulticastClient
{
    class MulticastClient : UdpClient
    {
        public string Multicast;

        public MulticastClient(string address, int port) : base(address, port) {}

        public void DisconnectAndStop()
        {
            _stop = true;
            Disconnect();
            while (IsConnected)
                Thread.Yield();
        }

        protected override void OnConnected()
        {
            Console.WriteLine($"Multicast UDP client connected a new session with Id {Id}");

            // Join UDP multicast group
            JoinMulticastGroup(Multicast);

            // Start receive datagrams
            ReceiveAsync();
        }

        protected override void OnDisconnected()
        {
            Console.WriteLine($"Multicast UDP client disconnected a session with Id {Id}");

            // Wait for a while...
            Thread.Sleep(1000);

            // Try to connect again
            if (!_stop)
                Connect();
        }

        protected override void OnReceived(EndPoint endpoint, byte[] buffer, long offset, long size)
        {
            Console.WriteLine("Incoming: " + Encoding.UTF8.GetString(buffer, (int)offset, (int)size));

            // Continue receive datagrams
            ReceiveAsync();
        }

        protected override void OnError(SocketError error)
        {
            Console.WriteLine($"Multicast UDP client caught an error with code {error}");
        }

        private bool _stop;
    }

    class Program
    {
        static void Main(string[] args)
        {
            // UDP listen address
            string listenAddress = "0.0.0.0";
            if (args.Length > 0)
                listenAddress = args[0];

            // UDP multicast address
            string multicastAddress = "239.255.0.1";
            if (args.Length > 1)
                multicastAddress = args[1];

            // UDP multicast port
            int multicastPort = 3334;
            if (args.Length > 2)
                multicastPort = int.Parse(args[2]);

            Console.WriteLine($"UDP listen address: {listenAddress}");
            Console.WriteLine($"UDP multicast address: {multicastAddress}");
            Console.WriteLine($"UDP multicast port: {multicastPort}");

            Console.WriteLine();

            // Create a new TCP chat client
            var client = new MulticastClient(listenAddress, multicastPort);
            client.SetupMulticast(true);
            client.Multicast = multicastAddress;

            // Connect the client
            Console.Write("Client connecting...");
            client.Connect();
            Console.WriteLine("Done!");

            Console.WriteLine("Press Enter to stop the client or '!' to reconnect the client...");

            // Perform text input
            for (;;)
            {
                string line = Console.ReadLine();
                if (string.IsNullOrEmpty(line))
                    break;

                // Disconnect the client
                if (line == "!")
                {
                    Console.Write("Client disconnecting...");
                    client.Disconnect();
                    Console.WriteLine("Done!");
                    continue;
                }
            }

            // Disconnect the client
            Console.Write("Client disconnecting...");
            client.DisconnectAndStop();
            Console.WriteLine("Done!");
        }
    }
}

Example: HTTP server

Here comes the example of the HTTP cache server. It allows to manipulate cache data with HTTP methods (GET, POST, PUT and DELETE).

Use the following link to open Swagger OpenAPI iterative documentation: http://localhost:8080/api/index.html

OpenAPI-HTTP

using System;
using System.Collections.Concurrent;
using System.Net;
using System.Net.Sockets;
using System.Text;
using NetCoreServer;

namespace HttpServer
{
    class CommonCache
    {
        public static CommonCache GetInstance()
        {
            if (_instance == null)
                _instance = new CommonCache();
            return _instance;
        }

        public string GetAllCache()
        {
            var result = new StringBuilder();
            result.Append("[\n");
            foreach (var item in _cache)
            {
                result.Append("  {\n");
                result.AppendFormat($"    \"key\": \"{item.Key}\",\n");
                result.AppendFormat($"    \"value\": \"{item.Value}\",\n");
                result.Append("  },\n");
            }
            result.Append("]\n");
            return result.ToString();
        }

        public bool GetCacheValue(string key, out string value)
        {
            return _cache.TryGetValue(key, out value);
        }

        public void PutCacheValue(string key, string value)
        {
            _cache[key] = value;
        }

        public bool DeleteCacheValue(string key, out string value)
        {
            return _cache.TryRemove(key, out value);
        }

        private readonly ConcurrentDictionary<string, string> _cache = new ConcurrentDictionary<string, string>();
        private static CommonCache _instance;
    }

    class HttpCacheSession : HttpSession
    {
        public HttpCacheSession(NetCoreServer.HttpServer server) : base(server) {}

        protected override void OnReceivedRequest(HttpRequest request)
        {
            // Show HTTP request content
            Console.WriteLine(request);

            // Process HTTP request methods
            if (request.Method == "HEAD")
                SendResponseAsync(Response.MakeHeadResponse());
            else if (request.Method == "GET")
            {
                string key = request.Url;

                // Decode the key value
                key = Uri.UnescapeDataString(key);
                key = key.Replace("/api/cache", "", StringComparison.InvariantCultureIgnoreCase);
                key = key.Replace("?key=", "", StringComparison.InvariantCultureIgnoreCase);

                if (string.IsNullOrEmpty(key))
                {
                    // Response with all cache values
                    SendResponseAsync(Response.MakeGetResponse(CommonCache.GetInstance().GetAllCache(), "application/json; charset=UTF-8"));
                }
                // Get the cache value by the given key
                else if (CommonCache.GetInstance().GetCacheValue(key, out var value))
                {
                    // Response with the cache value
                    SendResponseAsync(Response.MakeGetResponse(value));
                }
                else
                    SendResponseAsync(Response.MakeErrorResponse(404, "Required cache value was not found for the key: " + key));
            }
            else if ((request.Method == "POST") || (request.Method == "PUT"))
            {
                string key = request.Url;
                string value = request.Body;

                // Decode the key value
                key = Uri.UnescapeDataString(key);
                key = key.Replace("/api/cache", "", StringComparison.InvariantCultureIgnoreCase);
                key = key.Replace("?key=", "", StringComparison.InvariantCultureIgnoreCase);

                // Put the cache value
                CommonCache.GetInstance().PutCacheValue(key, value);

                // Response with the cache value
                SendResponseAsync(Response.MakeOkResponse());
            }
            else if (request.Method == "DELETE")
            {
                string key = request.Url;

                // Decode the key value
                key = Uri.UnescapeDataString(key);
                key = key.Replace("/api/cache", "", StringComparison.InvariantCultureIgnoreCase);
                key = key.Replace("?key=", "", StringComparison.InvariantCultureIgnoreCase);

                // Delete the cache value
                if (CommonCache.GetInstance().DeleteCacheValue(key, out var value))
                {
                    // Response with the cache value
                    SendResponseAsync(Response.MakeGetResponse(value));
                }
                else
                    SendResponseAsync(Response.MakeErrorResponse(404, "Deleted cache value was not found for the key: " + key));
            }
            else if (request.Method == "OPTIONS")
                SendResponseAsync(Response.MakeOptionsResponse());
            else if (request.Method == "TRACE")
                SendResponseAsync(Response.MakeTraceResponse(request.Cache.Data));
            else
                SendResponseAsync(Response.MakeErrorResponse("Unsupported HTTP method: " + request.Method));
        }

        protected override void OnReceivedRequestError(HttpRequest request, string error)
        {
            Console.WriteLine($"Request error: {error}");
        }

        protected override void OnError(SocketError error)
        {
            Console.WriteLine($"HTTP session caught an error: {error}");
        }
    }

    class HttpCacheServer : NetCoreServer.HttpServer
    {
        public HttpCacheServer(IPAddress address, int port) : base(address, port) {}

        protected override TcpSession CreateSession() { return new HttpCacheSession(this); }

        protected override void OnError(SocketError error)
        {
            Console.WriteLine($"HTTP session caught an error: {error}");
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            // HTTP server port
            int port = 8080;
            if (args.Length > 0)
                port = int.Parse(args[0]);
            // HTTP server content path
            string www = "../../../../../www/api";
            if (args.Length > 1)
                www = args[1];

            Console.WriteLine($"HTTP server port: {port}");
            Console.WriteLine($"HTTP server static content path: {www}");
            Console.WriteLine($"HTTP server website: http://localhost:{port}/api/index.html");

            Console.WriteLine();

            // Create a new HTTP server
            var server = new HttpCacheServer(IPAddress.Any, port);
            server.AddStaticContent(www, "/api");

            // Start the server
            Console.Write("Server starting...");
            server.Start();
            Console.WriteLine("Done!");

            Console.WriteLine("Press Enter to stop the server or '!' to restart the server...");

            // Perform text input
            for (;;)
            {
                string line = Console.ReadLine();
                if (string.IsNullOrEmpty(line))
                    break;

                // Restart the server
                if (line == "!")
                {
                    Console.Write("Server restarting...");
                    server.Restart();
                    Console.WriteLine("Done!");
                }
            }

            // Stop the server
            Console.Write("Server stopping...");
            server.Stop();
            Console.WriteLine("Done!");
        }
    }
}

Example: HTTP client

Here comes the example of the HTTP client. It allows to send HTTP requests (GET, POST, PUT and DELETE) and receive HTTP responses.

using System;
using NetCoreServer;

namespace HttpClient
{
    class Program
    {
        static void Main(string[] args)
        {
            // HTTP server address
            string address = "127.0.0.1";
            if (args.Length > 0)
                address = args[0];

            // HTTP server port
            int port = 8080;
            if (args.Length > 1)
                port = int.Parse(args[1]);

            Console.WriteLine($"HTTP server address: {address}");
            Console.WriteLine($"HTTP server port: {port}");

            Console.WriteLine();

            // Create a new HTTP client
            var client = new HttpClientEx(address, port);

            Console.WriteLine("Press Enter to stop the client or '!' to reconnect the client...");

            // Perform text input
            for (;;)
            {
                string line = Console.ReadLine();
                if (string.IsNullOrEmpty(line))
                    break;

                // Reconnect the client
                if (line == "!")
                {
                    Console.Write("Client reconnecting...");
                    if (client.IsConnected)
                        client.ReconnectAsync();
                    else
                        client.ConnectAsync();
                    Console.WriteLine("Done!");
                    continue;
                }

                var commands = line.Split(' ');
                if (commands.Length < 2)
                {
                    Console.WriteLine("HTTP method and URL must be entered!");
                    continue;
                }

                if (commands[0].ToUpper() == "HEAD")
                {
                    var response = client.SendHeadRequest(commands[1]).Result;
                    Console.WriteLine(response);
                }
                else if (commands[0].ToUpper() == "GET")
                {
                    var response = client.SendGetRequest(commands[1]).Result;
                    Console.WriteLine(response);
                }
                else if (commands[0].ToUpper() == "POST")
                {
                    if (commands.Length < 3)
                    {
                        Console.WriteLine("HTTP method, URL and body must be entered!");
                        continue;
                    }

                    var response = client.SendPostRequest(commands[1], commands[2]).Result;
                    Console.WriteLine(response);
                }
                else if (commands[0].ToUpper() == "PUT")
                {
                    if (commands.Length < 3)
                    {
                        Console.WriteLine("HTTP method, URL and body must be entered!");
                        continue;
                    }

                    var response = client.SendPutRequest(commands[1], commands[2]).Result;
                    Console.WriteLine(response);
                }
                else if (commands[0].ToUpper() == "DELETE")
                {
                    var response = client.SendDeleteRequest(commands[1]).Result;
                    Console.WriteLine(response);
                }
                else if (commands[0].ToUpper() == "OPTIONS")
                {
                    var response = client.SendOptionsRequest(commands[1]).Result;
                    Console.WriteLine(response);
                }
                else if (commands[0].ToUpper() == "TRACE")
                {
                    var response = client.SendTraceRequest(commands[1]).Result;
                    Console.WriteLine(response);
                }
                else
                    Console.WriteLine("Unknown HTTP method");
            }

            // Disconnect the client
            Console.Write("Client disconnecting...");
            client.Disconnect();
            Console.WriteLine("Done!");
        }
    }
}

Example: HTTPS server

Here comes the example of the HTTPS cache server. It allows to manipulate cache data with HTTP methods (GET, POST, PUT and DELETE) with secured transport protocol.

Use the following link to open Swagger OpenAPI iterative documentation: https://localhost:8443/api/index.html

OpenAPI-HTTPS

using System;
using System.Collections.Concurrent;
using System.Net;
using System.Net.Sockets;
using System.Security.Authentication;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using NetCoreServer;

namespace HttpsServer
{
    class CommonCache
    {
        public static CommonCache GetInstance()
        {
            if (_instance == null)
                _instance = new CommonCache();
            return _instance;
        }

        public string GetAllCache()
        {
            var result = new StringBuilder();
            result.Append("[\n");
            foreach (var item in _cache)
            {
                result.Append("  {\n");
                result.AppendFormat($"    \"key\": \"{item.Key}\",\n");
                result.AppendFormat($"    \"value\": \"{item.Value}\",\n");
                result.Append("  },\n");
            }
            result.Append("]\n");
            return result.ToString();
        }

        public bool GetCacheValue(string key, out string value)
        {
            return _cache.TryGetValue(key, out value);
        }

        public void PutCacheValue(string key, string value)
        {
            _cache[key] = value;
        }

        public bool DeleteCacheValue(string key, out string value)
        {
            return _cache.TryRemove(key, out value);
        }

        private readonly ConcurrentDictionary<string, string> _cache = new ConcurrentDictionary<string, string>();
        private static CommonCache _instance;
    }

    class HttpsCacheSession : HttpsSession
    {
        public HttpsCacheSession(NetCoreServer.HttpsServer server) : base(server) { }

        protected override void OnReceivedRequest(HttpRequest request)
        {
            // Show HTTP request content
            Console.WriteLine(request);

            // Process HTTP request methods
            if (request.Method == "HEAD")
                SendResponseAsync(Response.MakeHeadResponse());
            else if (request.Method == "GET")
            {
                string key = request.Url;

                // Decode the key value
                key = Uri.UnescapeDataString(key);
                key = key.Replace("/api/cache", "", StringComparison.InvariantCultureIgnoreCase);
                key = key.Replace("?key=", "", StringComparison.InvariantCultureIgnoreCase);

                if (string.IsNullOrEmpty(key))
                {
                    // Response with all cache values
                    SendResponseAsync(Response.MakeGetResponse(CommonCache.GetInstance().GetAllCache(), "application/json; charset=UTF-8"));
                }
                // Get the cache value by the given key
                else if (CommonCache.GetInstance().GetCacheValue(key, out var value))
                {
                    // Response with the cache value
                    SendResponseAsync(Response.MakeGetResponse(value));
                }
                else
                    SendResponseAsync(Response.MakeErrorResponse(404, "Required cache value was not found for the key: " + key));
            }
            else if ((request.Method == "POST") || (request.Method == "PUT"))
            {
                string key = request.Url;
                string value = request.Body;

                // Decode the key value
                key = Uri.UnescapeDataString(key);
                key = key.Replace("/api/cache", "", StringComparison.InvariantCultureIgnoreCase);
                key = key.Replace("?key=", "", StringComparison.InvariantCultureIgnoreCase);

                // Put the cache value
                CommonCache.GetInstance().PutCacheValue(key, value);

                // Response with the cache value
                SendResponseAsync(Response.MakeOkResponse());
            }
            else if (request.Method == "DELETE")
            {
                string key = request.Url;

                // Decode the key value
                key = Uri.UnescapeDataString(key);
                key = key.Replace("/api/cache", "", StringComparison.InvariantCultureIgnoreCase);
                key = key.Replace("?key=", "", StringComparison.InvariantCultureIgnoreCase);

                // Delete the cache value
                if (CommonCache.GetInstance().DeleteCacheValue(key, out var value))
                {
                    // Response with the cache value
                    SendResponseAsync(Response.MakeGetResponse(value));
                }
                else
                    SendResponseAsync(Response.MakeErrorResponse(404, "Deleted cache value was not found for the key: " + key));
            }
            else if (request.Method == "OPTIONS")
                SendResponseAsync(Response.MakeOptionsResponse());
            else if (request.Method == "TRACE")
                SendResponseAsync(Response.MakeTraceResponse(request.Cache));
            else
                SendResponseAsync(Response.MakeErrorResponse("Unsupported HTTP method: " + request.Method));
        }

        protected override void OnReceivedRequestError(HttpRequest request, string error)
        {
            Console.WriteLine($"Request error: {error}");
        }

        protected override void OnError(SocketError error)
        {
            Console.WriteLine($"HTTPS session caught an error: {error}");
        }
    }

    class HttpsCacheServer : NetCoreServer.HttpsServer
    {
        public HttpsCacheServer(SslContext context, IPAddress address, int port) : base(context, address, port) {}

        protected override SslSession CreateSession() { return new HttpsCacheSession(this); }

        protected override void OnError(SocketError error)
        {
            Console.WriteLine($"HTTPS server caught an error: {error}");
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            // HTTPS server port
            int port = 8443;
            if (args.Length > 0)
                port = int.Parse(args[0]);
            // HTTPS server content path
            string www = "../../../../../www/api";
            if (args.Length > 1)
                www = args[1];

            Console.WriteLine($"HTTPS server port: {port}");
            Console.WriteLine($"HTTPS server static content path: {www}");
            Console.WriteLine($"HTTPS server website: https://localhost:{port}/api/index.html");

            Console.WriteLine();

            // Create and prepare a new SSL server context
            var context = new SslContext(SslProtocols.Tls12, new X509Certificate2("server.pfx", "qwerty"));

            // Create a new HTTP server
            var server = new HttpsCacheServer(context, IPAddress.Any, port);
            server.AddStaticContent(www, "/api");

            // Start the server
            Console.Write("Server starting...");
            server.Start();
            Console.WriteLine("Done!");

            Console.WriteLine("Press Enter to stop the server or '!' to restart the server...");

            // Perform text input
            for (;;)
            {
                string line = Console.ReadLine();
                if (string.IsNullOrEmpty(line))
                    break;

                // Restart the server
                if (line == "!")
                {
                    Console.Write("Server restarting...");
                    server.Restart();
                    Console.WriteLine("Done!");
                }
            }

            // Stop the server
            Console.Write("Server stopping...");
            server.Stop();
            Console.WriteLine("Done!");
        }
    }
}

Example: HTTPS client

Here comes the example of the HTTPS client. It allows to send HTTP requests (GET, POST, PUT and DELETE) and receive HTTP responses with secured transport protocol.

using System;
using System.Security.Authentication;
using System.Security.Cryptography.X509Certificates;
using NetCoreServer;

namespace HttpsClient
{
    class Program
    {
        static void Main(string[] args)
        {
            // HTTPS server address
            string address = "127.0.0.1";
            if (args.Length > 0)
                address = args[0];

            // HTTPS server port
            int port = 8443;
            if (args.Length > 1)
                port = int.Parse(args[1]);

            Console.WriteLine($"HTTPS server address: {address}");
            Console.WriteLine($"HTTPS server port: {port}");

            Console.WriteLine();

            // Create and prepare a new SSL client context
            var context = new SslContext(SslProtocols.Tls12, new X509Certificate2("client.pfx", "qwerty"), (sender, certificate, chain, sslPolicyErrors) => true);

            // Create a new HTTPS client
            var client = new HttpsClientEx(context, address, port);

            Console.WriteLine("Press Enter to stop the client or '!' to reconnect the client...");

            // Perform text input
            for (;;)
            {
                string line = Console.ReadLine();
                if (string.IsNullOrEmpty(line))
                    break;

                // Reconnect the client
                if (line == "!")
                {
                    Console.Write("Client reconnecting...");
                    if (client.IsConnected)
                        client.ReconnectAsync();
                    else
                        client.ConnectAsync();
                    Console.WriteLine("Done!");
                    continue;
                }

                var commands = line.Split(' ');
                if (commands.Length < 2)
                {
                    Console.WriteLine("HTTP method and URL must be entered!");
                    continue;
                }

                if (commands[0].ToUpper() == "HEAD")
                {
                    var response = client.SendHeadRequest(commands[1]).Result;
                    Console.WriteLine(response);
                }
                else if (commands[0].ToUpper() == "GET")
                {
                    var response = client.SendGetRequest(commands[1]).Result;
                    Console.WriteLine(response);
                }
                else if (commands[0].ToUpper() == "POST")
                {
                    if (commands.Length < 3)
                    {
                        Console.WriteLine("HTTP method, URL and body must be entered!");
                        continue;
                    }

                    var response = client.SendPostRequest(commands[1], commands[2]).Result;
                    Console.WriteLine(response);
                }
                else if (commands[0].ToUpper() == "PUT")
                {
                    if (commands.Length < 3)
                    {
                        Console.WriteLine("HTTP method, URL and body must be entered!");
                        continue;
                    }

                    var response = client.SendPutRequest(commands[1], commands[2]).Result;
                    Console.WriteLine(response);
                }
                else if (commands[0].ToUpper() == "DELETE")
                {
                    var response = client.SendDeleteRequest(commands[1]).Result;
                    Console.WriteLine(response);
                }
                else if (commands[0].ToUpper() == "OPTIONS")
                {
                    var response = client.SendOptionsRequest(commands[1]).Result;
                    Console.WriteLine(response);
                }
                else if (commands[0].ToUpper() == "TRACE")
                {
                    var response = client.SendTraceRequest(commands[1]).Result;
                    Console.WriteLine(response);
                }
                else
                    Console.WriteLine("Unknown HTTP method");
            }

            // Disconnect the client
            Console.Write("Client disconnecting...");
            client.Disconnect();
            Console.WriteLine("Done!");
        }
    }
}

Example: WebSocket chat server

Here comes the example of the WebSocket chat server. It handles multiple WebSocket client sessions and multicast received message from any session to all ones. Also it is possible to send admin message directly from the server.

Use the following link to open WebSocket chat server example: http://localhost:8080/chat/index.html

ws-chat

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using NetCoreServer;

namespace WsChatServer
{
    class ChatSession : WsSession
    {
        public ChatSession(WsServer server) : base(server) { }

        public override void OnWsConnected(HttpRequest request)
        {
            Console.WriteLine($"Chat WebSocket session with Id {Id} connected!");

            // Send invite message
            string message = "Hello from WebSocket chat! Please send a message or '!' to disconnect the client!";
            SendTextAsync(message);
        }

        public override void OnWsDisconnected()
        {
            Console.WriteLine($"Chat WebSocket session with Id {Id} disconnected!");
        }

        public override void OnWsReceived(byte[] buffer, long offset, long size)
        {
            string message = Encoding.UTF8.GetString(buffer, (int)offset, (int)size);
            Console.WriteLine("Incoming: " + message);

            // Multicast message to all connected sessions
            ((WsServer)Server).MulticastText(message);

            // If the buffer starts with '!' the disconnect the current session
            if (message == "!")
                Close(1000);
        }

        protected override void OnError(SocketError error)
        {
            Console.WriteLine($"Chat WebSocket session caught an error with code {error}");
        }
    }

    class ChatServer : WsServer
    {
        public ChatServer(IPAddress address, int port) : base(address, port) { }

        protected override TcpSession CreateSession() { return new ChatSession(this); }

        protected override void OnError(SocketError error)
        {
            Console.WriteLine($"Chat WebSocket server caught an error with code {error}");
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            // WebSocket server port
            int port = 8080;
            if (args.Length > 0)
                port = int.Parse(args[0]);
            // WebSocket server content path
            string www = "../../../../../www/ws";
            if (args.Length > 1)
                www = args[1];

            Console.WriteLine($"WebSocket server port: {port}");
            Console.WriteLine($"WebSocket server static content path: {www}");
            Console.WriteLine($"WebSocket server website: http://localhost:{port}/chat/index.html");

            Console.WriteLine();

            // Create a new WebSocket server
            var server = new ChatServer(IPAddress.Any, port);
            server.AddStaticContent(www, "/chat");

            // Start the server
            Console.Write("Server starting...");
            server.Start();
            Console.WriteLine("Done!");

            Console.WriteLine("Press Enter to stop the server or '!' to restart the server...");

            // Perform text input
            for (;;)
            {
                string line = Console.ReadLine();
                if (string.IsNullOrEmpty(line))
                    break;

                // Restart the server
                if (line == "!")
                {
                    Console.Write("Server restarting...");
                    server.Restart();
                    Console.WriteLine("Done!");
                }

                // Multicast admin message to all sessions
                line = "(admin) " + line;
                server.MulticastText(line);
            }

            // Stop the server
            Console.Write("Server stopping...");
            server.Stop();
            Console.WriteLine("Done!");
        }
    }
}

Example: WebSocket chat client

Here comes the example of the WebSocket chat client. It connects to the WebSocket chat server and allows to send message to it and receive new messages.

using System;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using NetCoreServer;

namespace WsChatClient
{
    class ChatClient : WsClient
    {
        public ChatClient(string address, int port) : base(address, port) { }

        public void DisconnectAndStop()
        {
            _stop = true;
            CloseAsync(1000);
            while (IsConnected)
                Thread.Yield();
        }

        public override void OnWsConnecting(HttpRequest request)
        {
            request.SetBegin("GET", "/");
            request.SetHeader("Host", "localhost");
            request.SetHeader("Origin", "http://localhost");
            request.SetHeader("Upgrade", "websocket");
            request.SetHeader("Connection", "Upgrade");
            request.SetHeader("Sec-WebSocket-Key", Convert.ToBase64String(WsNonce));
            request.SetHeader("Sec-WebSocket-Protocol", "chat, superchat");
            request.SetHeader("Sec-WebSocket-Version", "13");
        }

        public override void OnWsConnected(HttpResponse response)
        {
            Console.WriteLine($"Chat WebSocket client connected a new session with Id {Id}");
        }

        public override void OnWsDisconnected()
        {
            Console.WriteLine($"Chat WebSocket client disconnected a session with Id {Id}");
        }

        public override void OnWsReceived(byte[] buffer, long offset, long size)
        {
            Console.WriteLine($"Incoming: {Encoding.UTF8.GetString(buffer, (int)offset, (int)size)}");
        }

        protected override void OnDisconnected()
        {
            base.OnDisconnected();

            Console.WriteLine($"Chat WebSocket client disconnected a session with Id {Id}");

            // Wait for a while...
            Thread.Sleep(1000);

            // Try to connect again
            if (!_stop)
                ConnectAsync();
        }

        protected override void OnError(SocketError error)
        {
            Console.WriteLine($"Chat WebSocket client caught an error with code {error}");
        }

        private bool _stop;
    }

    class Program
    {
        static void Main(string[] args)
        {
            // WebSocket server address
            string address = "127.0.0.1";
            if (args.Length > 0)
                address = args[0];

            // WebSocket server port
            int port = 8080;
            if (args.Length > 1)
                port = int.Parse(args[1]);

            Console.WriteLine($"WebSocket server address: {address}");
            Console.WriteLine($"WebSocket server port: {port}");

            Console.WriteLine();

            // Create a new TCP chat client
            var client = new ChatClient(address, port);

            // Connect the client
            Console.Write("Client connecting...");
            client.ConnectAsync();
            Console.WriteLine("Done!");

            Console.WriteLine("Press Enter to stop the client or '!' to reconnect the client...");

            // Perform text input
            for (;;)
            {
                string line = Console.ReadLine();
                if (string.IsNullOrEmpty(line))
                    break;

                // Disconnect the client
                if (line == "!")
                {
                    Console.Write("Client disconnecting...");
                    client.DisconnectAsync();
                    Console.WriteLine("Done!");
                    continue;
                }

                // Send the entered text to the chat server
                client.SendTextAsync(line);
            }

            // Disconnect the client
            Console.Write("Client disconnecting...");
            client.DisconnectAndStop();
            Console.WriteLine("Done!");
        }
    }
}

Example: WebSocket secure chat server

Here comes the example of the WebSocket secure chat server. It handles multiple WebSocket secure client sessions and multicast received message from any session to all ones. Also it is possible to send admin message directly from the server.

This example is very similar to the WebSocket one except the code that prepares WebSocket secure context and handshake handler.

Use the following link to open WebSocket secure chat server example: https://localhost:8443/chat/index.html

wss-chat

using System;
using System.Net;
using System.Net.Sockets;
using System.Security.Authentication;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using NetCoreServer;

namespace WssChatServer
{
    class ChatSession : WssSession
    {
        public ChatSession(WssServer server) : base(server) { }

        public override void OnWsConnected(HttpRequest request)
        {
            Console.WriteLine($"Chat WebSocket session with Id {Id} connected!");

            // Send invite message
            string message = "Hello from WebSocket chat! Please send a message or '!' to disconnect the client!";
            SendTextAsync(message);
        }

        public override void OnWsDisconnected()
        {
            Console.WriteLine($"Chat WebSocket session with Id {Id} disconnected!");
        }

        public override void OnWsReceived(byte[] buffer, long offset, long size)
        {
            string message = Encoding.UTF8.GetString(buffer, (int)offset, (int)size);
            Console.WriteLine("Incoming: " + message);

            // Multicast message to all connected sessions
            ((WssServer)Server).MulticastText(message);

            // If the buffer starts with '!' the disconnect the current session
            if (message == "!")
                Close(1000);
        }

        protected override void OnError(SocketError error)
        {
            Console.WriteLine($"Chat WebSocket session caught an error with code {error}");
        }
    }

    class ChatServer : WssServer
    {
        public ChatServer(SslContext context, IPAddress address, int port) : base(context, address, port) { }

        protected override SslSession CreateSession() { return new ChatSession(this); }

        protected override void OnError(SocketError error)
        {
            Console.WriteLine($"Chat WebSocket server caught an error with code {error}");
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            // WebSocket server port
            int port = 8443;
            if (args.Length > 0)
                port = int.Parse(args[0]);
            // WebSocket server content path
            string www = "../../../../../www/wss";
            if (args.Length > 1)
                www = args[1];

            Console.WriteLine($"WebSocket server port: {port}");
            Console.WriteLine($"WebSocket server static content path: {www}");
            Console.WriteLine($"WebSocket server website: https://localhost:{port}/chat/index.html");

            Console.WriteLine();

            // Create and prepare a new SSL server context
            var context = new SslContext(SslProtocols.Tls12, new X509Certificate2("server.pfx", "qwerty"));

            // Create a new WebSocket server
            var server = new ChatServer(context, IPAddress.Any, port);
            server.AddStaticContent(www, "/chat");

            // Start the server
            Console.Write("Server starting...");
            server.Start();
            Console.WriteLine("Done!");

            Console.WriteLine("Press Enter to stop the server or '!' to restart the server...");

            // Perform text input
            for (;;)
            {
                string line = Console.ReadLine();
                if (string.IsNullOrEmpty(line))
                    break;

                // Restart the server
                if (line == "!")
                {
                    Console.Write("Server restarting...");
                    server.Restart();
                    Console.WriteLine("Done!");
                }

                // Multicast admin message to all sessions
                line = "(admin) " + line;
                server.MulticastText(line);
            }

            // Stop the server
            Console.Write("Server stopping...");
            server.Stop();
            Console.WriteLine("Done!");
        }
    }
}

Example: WebSocket secure chat client

Here comes the example of the WebSocket secure chat client. It connects to the WebSocket secure chat server and allows to send message to it and receive new messages.

This example is very similar to the WebSocket one except the code that prepares WebSocket secure context and handshake handler.

using System;
using System.Net.Sockets;
using System.Security.Authentication;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using System.Threading;
using NetCoreServer;

namespace WssChatClient
{
    class ChatClient : WssClient
    {
        public ChatClient(SslContext context, string address, int port) : base(context, address, port) { }

        public void DisconnectAndStop()
        {
            _stop = true;
            CloseAsync(1000);
            while (IsConnected)
                Thread.Yield();
        }

        public override void OnWsConnecting(HttpRequest request)
        {
            request.SetBegin("GET", "/");
            request.SetHeader("Host", "localhost");
            request.SetHeader("Origin", "http://localhost");
            request.SetHeader("Upgrade", "websocket");
            request.SetHeader("Connection", "Upgrade");
            request.SetHeader("Sec-WebSocket-Key", Convert.ToBase64String(WsNonce));
            request.SetHeader("Sec-WebSocket-Protocol", "chat, superchat");
            request.SetHeader("Sec-WebSocket-Version", "13");
        }

        public override void OnWsConnected(HttpResponse response)
        {
            Console.WriteLine($"Chat WebSocket client connected a new session with Id {Id}");
        }

        public override void OnWsDisconnected()
        {
            Console.WriteLine($"Chat WebSocket client disconnected a session with Id {Id}");
        }

        public override void OnWsReceived(byte[] buffer, long offset, long size)
        {
            Console.WriteLine($"Incoming: {Encoding.UTF8.GetString(buffer, (int)offset, (int)size)}");
        }

        protected override void OnDisconnected()
        {
            base.OnDisconnected();

            Console.WriteLine($"Chat WebSocket client disconnected a session with Id {Id}");

            // Wait for a while...
            Thread.Sleep(1000);

            // Try to connect again
            if (!_stop)
                ConnectAsync();
        }

        protected override void OnError(SocketError error)
        {
            Console.WriteLine($"Chat WebSocket client caught an error with code {error}");
        }

        private bool _stop;
    }

    class Program
    {
        static void Main(string[] args)
        {
            // WebSocket server address
            string address = "127.0.0.1";
            if (args.Length > 0)
                address = args[0];

            // WebSocket server port
            int port = 8443;
            if (args.Length > 1)
                port = int.Parse(args[1]);

            Console.WriteLine($"WebSocket server address: {address}");
            Console.WriteLine($"WebSocket server port: {port}");

            Console.WriteLine();

            // Create and prepare a new SSL client context
            var context = new SslContext(SslProtocols.Tls12, new X509Certificate2("client.pfx", "qwerty"), (sender, certificate, chain, sslPolicyErrors) => true);

            // Create a new TCP chat client
            var client = new ChatClient(context, address, port);

            // Connect the client
            Console.Write("Client connecting...");
            client.ConnectAsync();
            Console.WriteLine("Done!");

            Console.WriteLine("Press Enter to stop the client or '!' to reconnect the client...");

            // Perform text input
            for (;;)
            {
                string line = Console.ReadLine();
                if (string.IsNullOrEmpty(line))
                    break;

                // Reconnect the client
                if (line == "!")
                {
                    Console.Write("Client reconnecting...");
                    if (client.IsConnected)
                        client.ReconnectAsync();
                    else
                        client.ConnectAsync();
                    Console.WriteLine("Done!");
                    continue;
                }

                // Send the entered text to the chat server
                client.SendTextAsync(line);
            }

            // Disconnect the client
            Console.Write("Client disconnecting...");
            client.DisconnectAndStop();
            Console.WriteLine("Done!");
        }
    }
}

Performance

Here comes several communication scenarios with timing measurements.

Benchmark environment is the following:

CPU architecutre: Intel(R) Core(TM) i7-4790K CPU @ 4.00GHz
CPU logical cores: 8
CPU physical cores: 4
CPU clock speed: 3.998 GHz
CPU Hyper-Threading: enabled
RAM total: 31.962 GiB
RAM free: 24.011 GiB

OS version: Microsoft Windows 8 Enterprise Edition (build 9200), 64-bit
OS bits: 64-bit
Process bits: 64-bit
Process configuaraion: release

Benchmark: Round-Trip

Round-trip

This scenario sends lots of messages from several clients to a server. The server responses to each message and resend the similar response to the client. The benchmark measures total round-trip time to send all messages and receive all responses, messages & data throughput, count of errors.

TCP echo server

TcpEchoServer
TcpEchoClient -c 1

Server address: 127.0.0.1
Server port: 1111
Working clients: 1
Working messages: 1000
Message size: 32
Seconds to benchmarking: 10

Errors: 0

Total time: 10.024 s
Total data: 2.831 GiB
Total messages: 94369133
Data throughput: 287.299 MiB/s
Message latency: 106 ns
Message throughput: 9413997 msg/s

TcpEchoServer
TcpEchoClient -c 100

Server address: 127.0.0.1
Server port: 1111
Working clients: 100
Working messages: 1000
Message size: 32
Seconds to benchmarking: 10

Errors: 0

Total time: 10.189 s
Total data: 1.794 GiB
Total messages: 59585544
Data throughput: 178.463 MiB/s
Message latency: 171 ns
Message throughput: 5847523 msg/s

SSL echo server

SslEchoServer
SslEchoClient -c 1

Server address: 127.0.0.1
Server port: 2222
Working clients: 1
Working messages: 1000
Message size: 32
Seconds to benchmarking: 10

Errors: 0

Total time: 2.645 s
Total data: 373.329 MiB
Total messages: 12233021
Data throughput: 141.095 MiB/s
Message latency: 216 ns
Message throughput: 4623352 msg/s

SslEchoServer
SslEchoClient -c 100

Server address: 127.0.0.1
Server port: 2222
Working clients: 100
Working messages: 1000
Message size: 32
Seconds to benchmarking: 10

Errors: 0

Total time: 10.060 s
Total data: 1.472 GiB
Total messages: 49029133
Data throughput: 148.741 MiB/s
Message latency: 205 ns
Message throughput: 4873398 msg/s

UDP echo server

UdpEchoServer
UdpEchoClient -c 1

Server address: 127.0.0.1
Server port: 3333
Working clients: 1
Working messages: 1000
Message size: 32
Seconds to benchmarking: 10

Errors: 0

Total time: 10.032 s
Total data: 33.994 MiB
Total messages: 1113182
Data throughput: 3.395 MiB/s
Message latency: 9.012 mcs
Message throughput: 110960 msg/s

UdpEchoServer
UdpEchoClient -c 100

Server address: 127.0.0.1
Server port: 3333
Working clients: 100
Working messages: 1000
Message size: 32
Seconds to benchmarking: 10

Errors: 0

Total time: 10.635 s
Total data: 20.355 MiB
Total messages: 666791
Data throughput: 1.934 MiB/s
Message latency: 15.950 mcs
Message throughput: 62693 msg/s

WebSocket echo server

WsEchoServer
WsEchoClient -c 1

Server address: 127.0.0.1
Server port: 8080
Working clients: 1
Working messages: 1000
Message size: 32
Seconds to benchmarking: 10

Errors: 0

Total time: 3.037 s
Total data: 105.499 MiB
Total messages: 3456618
Data throughput: 34.742 MiB/s
Message latency: 878 ns
Message throughput: 1137864 msg/s

WsEchoServer
WsEchoClient -c 100

Server address: 127.0.0.1
Server port: 8080
Working clients: 100
Working messages: 1000
Message size: 32
Seconds to benchmarking: 10

Errors: 0

Total time: 10.078 s
Total data: 426.803 MiB
Total messages: 13984888
Data throughput: 42.353 MiB/s
Message latency: 720 ns
Message throughput: 1387555 msg/s

WebSocket secure echo server

WssEchoServer
WssEchoClient -c 1

Server address: 127.0.0.1
Server port: 8443
Working clients: 1
Working messages: 1000
Message size: 32
Seconds to benchmarking: 10

Errors: 0

Total time: 10.030 s
Total data: 198.103 MiB
Total messages: 6491390
Data throughput: 19.767 MiB/s
Message latency: 1.545 mcs
Message throughput: 647153 msg/s

WssEchoServer
WssEchoClient -c 100

Server address: 127.0.0.1
Server port: 8443
Working clients: 100
Working messages: 1000
Message size: 32
Seconds to benchmarking: 10

Errors: 0

Total time: 10.112 s
Total data: 405.286 MiB
Total messages: 13280221
Data throughput: 40.078 MiB/s
Message latency: 761 ns
Message throughput: 1313228 msg/s

Benchmark: Multicast

Multicast

In this scenario server multicasts messages to all connected clients. The benchmark counts total messages received by all clients for all the working time and measures messages & data throughput, count of errors.

TCP multicast server

TcpMulticastServer
TcpMulticastClient -c 1

Server address: 127.0.0.1
Server port: 1111
Working clients: 1
Message size: 32
Seconds to benchmarking: 10

Errors: 0

Total time: 10.022 s
Total data: 407.023 MiB
Total messages: 13337326
Data throughput: 40.625 MiB/s
Message latency: 751 ns
Message throughput: 1330734 msg/s

TcpMulticastServer
TcpMulticastClient -c 100

Server address: 127.0.0.1
Server port: 1111
Working clients: 100
Message size: 32
Seconds to benchmarking: 10

Errors: 0

Total time: 10.112 s
Total data: 421.348 MiB
Total messages: 13806493
Data throughput: 41.681 MiB/s
Message latency: 732 ns
Message throughput: 1365280 msg/s

SSL multicast server

SslMulticastServer
SslMulticastClient -c 1

Server address: 127.0.0.1
Server port: 2222
Working clients: 1
Message size: 32
Seconds to benchmarking: 10

Errors: 0

Total time: 10.024 s
Total data: 325.225 MiB
Total messages: 10656801
Data throughput: 32.453 MiB/s
Message latency: 940 ns
Message throughput: 1063075 msg/s

SslMulticastServer
SslMulticastClient -c 100

Server address: 127.0.0.1
Server port: 2222
Working clients: 100
Message size: 32
Seconds to benchmarking: 10

Errors: 0

Total time: 10.144 s
Total data: 343.460 MiB
Total messages: 11254173
Data throughput: 33.876 MiB/s
Message latency: 901 ns
Message throughput: 1109393 msg/s

UDP multicast server

UdpMulticastServer
UdpMulticastClient -c 1

Server address: 239.255.0.1
Server port: 3333
Working clients: 1
Message size: 32
Seconds to benchmarking: 10

Errors: 0

Total time: 10.026 s
Total data: 13.225 MiB
Total messages: 433202
Data throughput: 1.326 MiB/s
Message latency: 23.145 mcs
Message throughput: 43205 msg/s

UdpMulticastServer
UdpMulticastClient -c 100

Server address: 239.255.0.1
Server port: 3333
Working clients: 100
Message size: 32
Seconds to benchmarking: 10

Errors: 0

Total time: 10.035 s
Total data: 28.684 MiB
Total messages: 939408
Data throughput: 2.877 MiB/s
Message latency: 10.682 mcs
Message throughput: 93606 msg/s

WebSocket multicast server

WsMulticastServer
WsMulticastClient -c 1

Server address: 127.0.0.1
Server port: 8080
Working clients: 1
Message size: 32
Seconds to benchmarking: 10

Errors: 0

Total time: 10.048 s
Total data: 183.108 MiB
Total messages: 6000000
Data throughput: 18.228 MiB/s
Message latency: 1.674 mcs
Message throughput: 597121 msg/s

WsMulticastServer
WsMulticastClient -c 100

Server address: 127.0.0.1
Server port: 8080
Working clients: 100
Message size: 32
Seconds to benchmarking: 10

Errors: 0

Total time: 10.227 s
Total data: 125.957 MiB
Total messages: 4126627
Data throughput: 12.320 MiB/s
Message latency: 2.478 mcs
Message throughput: 403466 msg/s

WebSocket secure multicast server

WssMulticastServer
WssMulticastClient -c 1

Server address: 127.0.0.1
Server port: 8443
Working clients: 1
Message size: 32
Seconds to benchmarking: 10

Errors: 0

Total time: 10.034 s
Total data: 184.159 MiB
Total messages: 6034421
Data throughput: 18.359 MiB/s
Message latency: 1.662 mcs
Message throughput: 601338 msg/s

WssMulticastServer
WssMulticastClient -c 100

Server address: 127.0.0.1
Server port: 8443
Working clients: 100
Message size: 32
Seconds to benchmarking: 10

Errors: 0

Total time: 10.171 s
Total data: 315.306 MiB
Total messages: 10331721
Data throughput: 30.1022 MiB/s
Message latency: 984 ns
Message throughput: 1015763 msg/s

Benchmark: Web Server

HTTP Trace server

HttpTraceServer
HttpTraceClient -c 1

Server address: 127.0.0.1
Server port: 8080
Working clients: 1
Working messages: 1
Seconds to benchmarking: 10

Errors: 0

Total time: 10.023 s
Total data: 10.987 MiB
Total messages: 108465
Data throughput: 1.096 MiB/s
Message latency: 92.414 mcs
Message throughput: 10820 msg/s

HttpTraceServer
HttpTraceClient -c 100

Server address: 127.0.0.1
Server port: 8080
Working clients: 100
Working messages: 1
Seconds to benchmarking: 10

Errors: 0

Total time: 10.085 s
Total data: 40.382 MiB
Total messages: 401472
Data throughput: 4.003 MiB/s
Message latency: 25.120 mcs
Message throughput: 39807 msg/s

HTTPS Trace server

HttpsTraceServer
HttpsTraceClient -c 1

Server address: 127.0.0.1
Server port: 8443
Working clients: 1
Working messages: 1
Seconds to benchmarking: 10

Errors: 0

Total time: 595.214 ms
Total data: 627.842 KiB
Total messages: 6065
Data throughput: 1.030 MiB/s
Message latency: 98.139 mcs
Message throughput: 10189 msg/s

HttpsTraceServer
HttpsTraceClient -c 100

Server address: 127.0.0.1
Server port: 8443
Working clients: 100
Working messages: 1
Seconds to benchmarking: 10

Errors: 0

Total time: 3.548 s
Total data: 17.948 MiB
Total messages: 179111
Data throughput: 5.052 MiB/s
Message latency: 19.813 mcs
Message throughput: 50471 msg/s

OpenSSL certificates

In order to create OpenSSL based server and client you should prepare a set of SSL certificates.

Production

Depending on your project, you may need to purchase a traditional SSL certificate signed by a Certificate Authority. If you, for instance, want some else's web browser to talk to your WebSocket project, you'll need a traditional SSL certificate.

Development

The commands below entered in the order they are listed will generate a self-signed certificate for development or testing purposes.

Certificate Authority

Create CA private key

openssl genrsa -passout pass:qwerty -out ca-secret.key 4096

Remove passphrase

openssl rsa -passin pass:qwerty -in ca-secret.key -out ca.key

Create CA self-signed certificate

openssl req -new -x509 -days 3650 -subj '/C=BY/ST=Belarus/L=Minsk/O=Example root CA/OU=Example CA unit/CN=example.com' -key ca.key -out ca.crt

Convert CA self-signed certificate to PFX

openssl pkcs12 -export -passout pass:qwerty -inkey ca.key -in ca.crt -out ca.pfx

Convert CA self-signed certificate to PEM

openssl pkcs12 -passin pass:qwerty -passout pass:qwerty -in ca.pfx -out ca.pem

SSL Server certificate

Create private key for the server

openssl genrsa -passout pass:qwerty -out server-secret.key 4096

Remove passphrase

openssl rsa -passin pass:qwerty -in server-secret.key -out server.key

Create CSR for the server

openssl req -new -subj '/C=BY/ST=Belarus/L=Minsk/O=Example server/OU=Example server unit/CN=server.example.com' -key server.key -out server.csr

Create certificate for the server

openssl x509 -req -days 3650 -in server.csr -CA ca.crt -CAkey ca.key -set_serial 01 -out server.crt

Convert the server certificate to PFX

openssl pkcs12 -export -passout pass:qwerty -inkey server.key -in server.crt -out server.pfx

Convert the server certificate to PEM

openssl pkcs12 -passin pass:qwerty -passout pass:qwerty -in server.pfx -out server.pem

SSL Client certificate

Create private key for the client

openssl genrsa -passout pass:qwerty -out client-secret.key 4096

Remove passphrase

openssl rsa -passin pass:qwerty -in client-secret.key -out client.key

Create CSR for the client

openssl req -new -subj '/C=BY/ST=Belarus/L=Minsk/O=Example client/OU=Example client unit/CN=client.example.com' -key client.key -out client.csr

Create the client certificate

openssl x509 -req -days 3650 -in client.csr -CA ca.crt -CAkey ca.key -set_serial 01 -out client.crt

Convert the client certificate to PFX

openssl pkcs12 -export -passout pass:qwerty -inkey client.key -in client.crt -out client.pfx

Convert the client certificate to PEM

openssl pkcs12 -passin pass:qwerty -passout pass:qwerty -in client.pfx -out client.pem

Diffie-Hellman key exchange

Create DH parameters shell openssl dhparam -out dh4096.pem 4096

NetCoreServer

Ultra fast and low latency asynchronous socket server & client C# .NET Core library with support TCP, SSL, UDP, HTTP, HTTPS, WebSocket protocols and 10K connections problem solution

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README

NetCoreServer

Contents

Features

Requirements

How to build?

Setup repository

Linux

OSX

Windows (Visual Studio)

Examples

Example: TCP chat server

Example: TCP chat client

Example: SSL chat server

Example: SSL chat client

Example: UDP echo server

Example: UDP echo client

Example: UDP multicast server

Example: UDP multicast client

Example: HTTP server

Example: HTTP client

Example: HTTPS server

Example: HTTPS client

Example: WebSocket chat server

Example: WebSocket chat client

Example: WebSocket secure chat server

Example: WebSocket secure chat client

Performance

Benchmark: Round-Trip

TCP echo server

SSL echo server

UDP echo server

WebSocket echo server

WebSocket secure echo server

Benchmark: Multicast

TCP multicast server

SSL multicast server

UDP multicast server

WebSocket multicast server

WebSocket secure multicast server

Benchmark: Web Server

HTTP Trace server

HTTPS Trace server

OpenSSL certificates

Production

Development

Certificate Authority

SSL Server certificate

SSL Client certificate

Diffie-Hellman key exchange