web-sockets-5 – C# (Csharp) 프로그래밍


using Microsoft.AspNetCore.Hosting; //IWebHostBuilder
using Microsoft.AspNetCore.Builder; //IApplicationBuilder
using Microsoft.AspNetCore.Http; //WriteAsync
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Microsoft.AspNetCore;
using System;
using System.Threading;
using System.Net.WebSockets;
using System.Text;
using System.IO;
using System.Collections.Concurrent;
using System.Linq;
using System.Threading.Tasks;
using System.Collections.Generic;

namespace WebApplication1
{
    public class ConnectionManager
    {
        ConcurrentDictionary<string, (WebSocket socket, string nickname)> _sockets = new ConcurrentDictionary<string, (WebSocket, string)>();

        public string AddSocket(WebSocket socket)
        {
            var id = Guid.NewGuid().ToString();

            if (!_sockets.TryAdd(id, (socket, string.Empty)))
                throw new Exception($"Problem in adding socket with Id {id}");

            return id;
        }

        public bool SetNickName(string id, string nickname)
        {
            if (_sockets.TryGetValue(id, out var x))
            {
                _sockets[id] = (x.socket, nickname);
                return true;
            }
            else
                return false;
        }

        public (bool, string) GetNickNameById(string id)
        {
            if (_sockets.TryGetValue(id, out var x))
                return (true, x.nickname);
            else
                return (false, null);
        }

        public (bool, WebSocket socket) GetByNick(string nickname)
        {
            var found = _sockets.Where(x => x.Value.nickname.Equals(nickname, StringComparison.CurrentCultureIgnoreCase)).Take(1).ToList();

            if (found.Count == 0)
                return (false, null);
            else
                return (true, found[0].Value.socket);
        }

        public bool RemoveSocket(string id) => _sockets.TryRemove(id, out (WebSocket, string) _);

        public List<(WebSocket socket, string id, string nickname)> Other(string id) =>
            _sockets.Where(x => x.Key != id)
            .Select(x => (x.Value.socket, x.Key, x.Value.nickname))
            .ToList();
    }

    public enum CommandType
    {
        List,
        Send,
        Nick,
        Quit
    }

    public class Command
    {
        public CommandType Type { get; set; }

        public (string, string, string) Data { get; set; }
    }

    public class CommandHandler
    {
        public (bool, Command) Parse(string cmd)
        {
            try
            {
                if (cmd.StartsWith("#"))
                {
                    var segment = cmd.Split(new[] { ' ' });

                    if (segment.Length > 0)
                    {
                        switch (segment[0])
                        {
                            case "#list": return (true, new Command { Type = CommandType.List, Data = ("", "", "") });
                            case "#quit": return (true, new Command { Type = CommandType.Quit, Data = ("", "", "") });
                            case "#nick": return (true, new Command { Type = CommandType.Nick, Data = (segment[1], "", "") });
                            case "#talk": return (true, new Command { Type = CommandType.Send, Data = (segment[1], string.Join(" ", segment.Skip(2)), "") });
                            default: return (false, null);
                        }
                    }
                }

                return (false, null);
            }
            catch
            {
                return (false, null);
            }
        }
    }

    public class Startup
    {
        async Task ReceiveAsync(ConnectionManager cm, ILogger log, WebSocket socket, string socketId, Func<ConnectionManager, string, Task> responseHandlerAsync)
        {
            var bufferSize = new byte[4]; //This is especially small just to exercise the code that handles data that is larger than buffer
            var receiveBuffer = new ArraySegment<byte>(bufferSize);
            WebSocketReceiveResult result;

            while (socket.State == WebSocketState.Open)
            {
                using (var ms = new MemoryStream())
                {
                    do
                    {
                        result = await socket.ReceiveAsync(receiveBuffer, CancellationToken.None);

                        if (result.MessageType == WebSocketMessageType.Close)
                        {
                            log.LogDebug($"Socket Id {socketId} : Receive closing message.");
                            var removalStatus = cm.RemoveSocket(socketId);
                            log.LogDebug($"Socket Id {socketId} removal status {removalStatus}.");
                            break;
                        }

                        if (result.MessageType != WebSocketMessageType.Text)
                            throw new Exception("Unexpected Message");

                        ms.Write(receiveBuffer.Array, receiveBuffer.Offset, result.Count);
                    }
                    while (!result.EndOfMessage && !result.CloseStatus.HasValue);

                    if (result.MessageType == WebSocketMessageType.Text)
                    {
                        ms.Seek(0, SeekOrigin.Begin);

                        string clientRequest = string.Empty;
                        using (var reader = new StreamReader(ms, Encoding.UTF8))
                        {
                            clientRequest = reader.ReadToEnd();
                        }

                        log.LogDebug($"Socket Id {socketId} : Receive: {clientRequest}");

                        await responseHandlerAsync(cm, clientRequest);
                    }

                    if (result.CloseStatus.HasValue)
                        break;
                }
            }
        }

        public ArraySegment<byte> Reply(string content) => new ArraySegment<byte>(Encoding.UTF8.GetBytes(content));

        public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory logger)
        {
           // logger.AddConsole((str, level) => !str.Contains("Microsoft.AspNetCore") && level >= LogLevel.Trace);

            var log = logger.CreateLogger("");

            app.UseWebSockets();

            var cm = new ConnectionManager();

            app.Use(async (context, next) =>
            {
                if (!context.WebSockets.IsWebSocketRequest)
                {
                    await next();
                    return;
                }

                var socket = await context.WebSockets.AcceptWebSocketAsync();
                var socketId = cm.AddSocket(socket);

                var cmdHandler = new CommandHandler();
                await ReceiveAsync(cm, log, socket, socketId, async (connectionManager, clientRequest) =>
                {
                    var (isOK, cmd) = cmdHandler.Parse(clientRequest);

                    if (isOK)
                    {
                        switch (cmd.Type)
                        {
                            case CommandType.List:
                                {
                                    var others = connectionManager.Other(socketId).Select(x => string.IsNullOrWhiteSpace(x.nickname) ? "NoNick" : x.nickname).ToList();
                                    if (others.Count > 0)
                                        await socket.SendAsync(Reply(string.Join(",", others)), WebSocketMessageType.Text, true, CancellationToken.None);
                                    else
                                        await socket.SendAsync(Reply("No other user on this channel"), WebSocketMessageType.Text, true, CancellationToken.None);

                                    break;
                                }

                            case CommandType.Nick:
                                {
                                    var isOk = connectionManager.SetNickName(socketId, cmd.Data.Item1);
                                    if (isOK)
                                        await socket.SendAsync(Reply($"Nickname now {cmd.Data.Item1}"), WebSocketMessageType.Text, true, CancellationToken.None);
                                    else
                                        await socket.SendAsync(Reply($"#nick fails"), WebSocketMessageType.Text, true, CancellationToken.None);

                                    break;
                                }

                            case CommandType.Send:
                                {
                                    var (isFound, sck) = connectionManager.GetByNick(cmd.Data.Item1);
                                    if (isFound)
                                    {
                                        var (isOk, sender) = connectionManager.GetNickNameById(socketId);
                                        if (isOK)
                                            await sck.SendAsync(Reply($"From {sender}: {cmd.Data.Item2}"), WebSocketMessageType.Text, true, CancellationToken.None);
                                        else
                                            await sck.SendAsync(Reply($"From Unknown: {cmd.Data.Item2}"), WebSocketMessageType.Text, true, CancellationToken.None);

                                        await socket.SendAsync(Reply($"Message sent to {cmd.Data.Item1}"), WebSocketMessageType.Text, true, CancellationToken.None);
                                    }
                                    else
                                        await socket.SendAsync(Reply($"{cmd.Data.Item1} not found"), WebSocketMessageType.Text, true, CancellationToken.None);

                                    break;
                                }

                            case CommandType.Quit:
                                {
                                    connectionManager.RemoveSocket(socketId);
                                    await socket.SendAsync(Reply("Quitting chat"), WebSocketMessageType.Text, true, CancellationToken.None);
                                    await socket.CloseAsync(WebSocketCloseStatus.NormalClosure, "", CancellationToken.None);

                                    break;
                                }

                            default:
                                {
                                    await socket.SendAsync(Reply("Command not understood"), WebSocketMessageType.Text, true, CancellationToken.None);

                                    break;
                                }
                        }
                    }
                    else
                        await socket.SendAsync(Reply("Command not understood"), WebSocketMessageType.Text, true, CancellationToken.None);
                });

                if (socket.State != WebSocketState.Open)
                    log.LogDebug($"Socket Id {socketId} with status {socket.State}");
            });

            app.Run(async context =>
            {
                context.Response.Headers.Add("content-type", "text/html");
                await context.Response.WriteAsync(@"
<html>                
    <head>
        <script src=""https://code.jquery.com/jquery-3.2.1.min.js"" integrity=""sha256-hwg4gsxgFZhOsEEamdOYGBf13FyQuiTwlAQgxVSNgt4="" crossorigin=""anonymous""></script>
    </head>
    <body>
        <h1>Web Socket (please open this page at 2 tabs at least)</h1>
        <p>Commands<p>
        <ul>
            <li>#list</li> 
            <li>#nick <i>nickname</i></li>
            <li>#talk <i>nickname</i> <i>text</i></li>
            <li>#quit</li>
        </ul>
        <input type=""text"" length=""50"" id=""msg"" value=""#nick anne""/> 
        <button type=""button"" id=""send"">Send</button>
        <button type=""button"" id=""close"">Close</button>
        <br/>
        <ul id=""responses""></ul>
        <script>
            $(function(){
                var url = ""wss://localhost:44323/"";
                var socket = new WebSocket(url);
                var send = $(""#send"");
                var close = $(""#close"");
                var msg = $(""#msg"");
                var responses = $(""#responses"");

                socket.onopen = function(e){
                    responses.append('<li>Socket opened</li>');
                    send.click(function(){
                        if (socket.readyState !== WebSocket.OPEN){
                            alert('Socket is closed. Cannot send message.');
                            return;
                        }
                        socket.send(msg.val()); 
                    });
                };

                close.click(function(){
                    if (socket.readyState !== WebSocket.OPEN){
                        alert('You cannot close this connection because it is already closed');
                        return;
                    }
                    socket.close();    
                });

                socket.onmessage = function(e){
                    var response = e.data;
                    responses.append('<BR/>');
                  responses.append(response.trim());

                    //alert(response.trim());

                };

                socket.onclose = function(e){
                    responses.append('<li>Socket closed</li>');
                };
            });
        </script>
    </body>
</html>");
            });
        }
    }

    public class Program
    {
        public static void Main(string[] args)
        {
            CreateWebHostBuilder(args).Build().Run();
        }

        static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
            WebHost.CreateDefaultBuilder(args)
                .UseStartup<Startup>()
                .UseEnvironment("Development");
    }
}

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using Microsoft.AspNetCore.Hosting; //IWebHostBuilder

using Microsoft.AspNetCore.Builder; //IApplicationBuilder

using Microsoft.AspNetCore.Http; //WriteAsync

using Microsoft.Extensions.DependencyInjection;

using Microsoft.Extensions.Logging;

using Microsoft.AspNetCore;

using System;

using System.Threading;

using System.Net.WebSockets;

using System.Text;

using System.IO;

using System.Collections.Concurrent;

using System.Linq;

using System.Threading.Tasks;

using System.Collections.Generic;

namespace WebApplication1

{

public class ConnectionManager

{

ConcurrentDictionary<string, (WebSocket socket, string nickname)> _sockets = new ConcurrentDictionary<string, (WebSocket, string)>();

public string AddSocket(WebSocket socket)

{

var id = Guid.NewGuid().ToString();

if (!_sockets.TryAdd(id, (socket, string.Empty)))

throw new Exception($"Problem in adding socket with Id {id}");

return id;

}

public bool SetNickName(string id, string nickname)

{

if (_sockets.TryGetValue(id, out var x))

{

_sockets[id] = (x.socket, nickname);

return true;

}

else

return false;

}

public (bool, string) GetNickNameById(string id)

{

if (_sockets.TryGetValue(id, out var x))

return (true, x.nickname);

else

return (false, null);

}

public (bool, WebSocket socket) GetByNick(string nickname)

{

var found = _sockets.Where(x => x.Value.nickname.Equals(nickname, StringComparison.CurrentCultureIgnoreCase)).Take(1).ToList();

if (found.Count == 0)

return (false, null);

else

return (true, found[0].Value.socket);

}

public bool RemoveSocket(string id) => _sockets.TryRemove(id, out (WebSocket, string) _);

public List<(WebSocket socket, string id, string nickname)> Other(string id) =>

_sockets.Where(x => x.Key != id)

.Select(x => (x.Value.socket, x.Key, x.Value.nickname))

.ToList();

}

public enum CommandType

{

List,

Send,

Nick,

Quit

}

public class Command

{

public CommandType Type { get; set; }

public (string, string, string) Data { get; set; }

}

public class CommandHandler

{

public (bool, Command) Parse(string cmd)

{

try

{

if (cmd.StartsWith("#"))

{

var segment = cmd.Split(new[] { ' ' });

if (segment.Length > 0)

{

switch (segment[0])

{

case "#list": return (true, new Command { Type = CommandType.List, Data = ("", "", "") });

case "#quit": return (true, new Command { Type = CommandType.Quit, Data = ("", "", "") });

case "#nick": return (true, new Command { Type = CommandType.Nick, Data = (segment[1], "", "") });

case "#talk": return (true, new Command { Type = CommandType.Send, Data = (segment[1], string.Join(" ", segment.Skip(2)), "") });

default: return (false, null);

}

return (false, null);

}

catch

{

return (false, null);

}

public class Startup

{

async Task ReceiveAsync(ConnectionManager cm, ILogger log, WebSocket socket, string socketId, Func<ConnectionManager, string, Task> responseHandlerAsync)

{

var bufferSize = new byte[4]; //This is especially small just to exercise the code that handles data that is larger than buffer

var receiveBuffer = new ArraySegment<byte>(bufferSize);

WebSocketReceiveResult result;

while (socket.State == WebSocketState.Open)

{

using (var ms = new MemoryStream())

{

result = await socket.ReceiveAsync(receiveBuffer, CancellationToken.None);

if (result.MessageType == WebSocketMessageType.Close)

{

log.LogDebug($"Socket Id {socketId} : Receive closing message.");

var removalStatus = cm.RemoveSocket(socketId);

log.LogDebug($"Socket Id {socketId} removal status {removalStatus}.");

break;

}

if (result.MessageType != WebSocketMessageType.Text)

throw new Exception("Unexpected Message");

ms.Write(receiveBuffer.Array, receiveBuffer.Offset, result.Count);

}

while (!result.EndOfMessage && !result.CloseStatus.HasValue);

if (result.MessageType == WebSocketMessageType.Text)

{

ms.Seek(0, SeekOrigin.Begin);

string clientRequest = string.Empty;

using (var reader = new StreamReader(ms, Encoding.UTF8))

{

clientRequest = reader.ReadToEnd();

}

log.LogDebug($"Socket Id {socketId} : Receive: {clientRequest}");

await responseHandlerAsync(cm, clientRequest);

}

if (result.CloseStatus.HasValue)

break;

}

public ArraySegment<byte> Reply(string content) => new ArraySegment<byte>(Encoding.UTF8.GetBytes(content));

public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory logger)

{

// logger.AddConsole((str, level) => !str.Contains("Microsoft.AspNetCore") && level >= LogLevel.Trace);

var log = logger.CreateLogger("");

app.UseWebSockets();

var cm = new ConnectionManager();

app.Use(async (context, next) =>

{

if (!context.WebSockets.IsWebSocketRequest)

{

await next();

return;

}

var socket = await context.WebSockets.AcceptWebSocketAsync();

var socketId = cm.AddSocket(socket);

var cmdHandler = new CommandHandler();

await ReceiveAsync(cm, log, socket, socketId, async (connectionManager, clientRequest) =>

{

var (isOK, cmd) = cmdHandler.Parse(clientRequest);

if (isOK)

{

switch (cmd.Type)

{

case CommandType.List:

{

var others = connectionManager.Other(socketId).Select(x => string.IsNullOrWhiteSpace(x.nickname) ? "NoNick" : x.nickname).ToList();

if (others.Count > 0)

await socket.SendAsync(Reply(string.Join(",", others)), WebSocketMessageType.Text, true, CancellationToken.None);

else

await socket.SendAsync(Reply("No other user on this channel"), WebSocketMessageType.Text, true, CancellationToken.None);

break;

}

case CommandType.Nick:

{

var isOk = connectionManager.SetNickName(socketId, cmd.Data.Item1);

if (isOK)

await socket.SendAsync(Reply($"Nickname now {cmd.Data.Item1}"), WebSocketMessageType.Text, true, CancellationToken.None);

else

await socket.SendAsync(Reply($"#nick fails"), WebSocketMessageType.Text, true, CancellationToken.None);

break;

}

case CommandType.Send:

{

var (isFound, sck) = connectionManager.GetByNick(cmd.Data.Item1);

if (isFound)

{

var (isOk, sender) = connectionManager.GetNickNameById(socketId);

if (isOK)

await sck.SendAsync(Reply($"From {sender}: {cmd.Data.Item2}"), WebSocketMessageType.Text, true, CancellationToken.None);

else

await sck.SendAsync(Reply($"From Unknown: {cmd.Data.Item2}"), WebSocketMessageType.Text, true, CancellationToken.None);

await socket.SendAsync(Reply($"Message sent to {cmd.Data.Item1}"), WebSocketMessageType.Text, true, CancellationToken.None);

}

else

await socket.SendAsync(Reply($"{cmd.Data.Item1} not found"), WebSocketMessageType.Text, true, CancellationToken.None);

break;

}

case CommandType.Quit:

{

connectionManager.RemoveSocket(socketId);

await socket.SendAsync(Reply("Quitting chat"), WebSocketMessageType.Text, true, CancellationToken.None);

await socket.CloseAsync(WebSocketCloseStatus.NormalClosure, "", CancellationToken.None);

break;

}

default:

{

await socket.SendAsync(Reply("Command not understood"), WebSocketMessageType.Text, true, CancellationToken.None);

break;

}

else

await socket.SendAsync(Reply("Command not understood"), WebSocketMessageType.Text, true, CancellationToken.None);

});

if (socket.State != WebSocketState.Open)

log.LogDebug($"Socket Id {socketId} with status {socket.State}");

});

app.Run(async context =>

{

context.Response.Headers.Add("content-type", "text/html");

await context.Response.WriteAsync(@"

<html>

<head>

</head>

<body>

<h1>Web Socket (please open this page at 2 tabs at least)</h1>

<p>Commands<p>

<ul>

<li>#nick <i>nickname</i></li>

<li>#talk <i>nickname</i> <i>text</i></li>

</ul>

<button type=""button"" id=""close"">Close</button>

<br/>

$(function(){

var url = ""wss://localhost:44323/"";

var socket = new WebSocket(url);

var send = $(""#send"");

var close = $(""#close"");

var msg = $(""#msg"");

var responses = $(""#responses"");

socket.onopen = function(e){

responses.append('<li>Socket opened</li>');

send.click(function(){

if (socket.readyState !== WebSocket.OPEN){

alert('Socket is closed. Cannot send message.');

return;

}

socket.send(msg.val());

});

};

close.click(function(){

if (socket.readyState !== WebSocket.OPEN){

alert('You cannot close this connection because it is already closed');

return;

}

socket.close();

});

socket.onmessage = function(e){

var response = e.data;

responses.append('<BR/>');

responses.append(response.trim());

//alert(response.trim());

};

socket.onclose = function(e){

responses.append('<li>Socket closed</li>');

};

});

</script>

</body>

</html>");

});

}

public class Program

{

public static void Main(string[] args)

{

CreateWebHostBuilder(args).Build().Run();

}

static IWebHostBuilder CreateWebHostBuilder(string[] args) =>

WebHost.CreateDefaultBuilder(args)

.UseStartup<Startup>()

.UseEnvironment("Development");

}

결과 :
Web Socket (please open this page at 2 tabs at least)

Commands

•#list
•#nick nickname
•#talk nickname text
•#quit
[ ] Send Close

•Socket opened
Nickname now nickname2
Message sent to nickname1
From nickname1: text
Message sent to nickname
nickname1,nickname
Message sent to nickname1
•Socket closed