118 lines
3.7 KiB
C#
118 lines
3.7 KiB
C#
using System.Diagnostics;
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using System.Net.WebSockets;
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using System.Threading.Channels;
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using DisplayCommands;
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using Microsoft.Extensions.Hosting;
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namespace TanksServer.Interactivity;
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internal sealed class ClientScreenServer(
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ILogger<ClientScreenServer> logger,
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ILoggerFactory loggerFactory
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) : IHostedLifecycleService
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{
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private readonly ConcurrentDictionary<ClientScreenServerConnection, byte> _connections = new();
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private bool _closing;
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public Task StoppingAsync(CancellationToken cancellationToken)
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{
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logger.LogInformation("closing connections");
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_closing = true;
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return Task.WhenAll(_connections.Keys.Select(c => c.CloseAsync()));
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}
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public Task HandleClient(WebSocket socket)
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{
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if (_closing)
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{
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logger.LogWarning("ignoring request because connections are closing");
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return Task.CompletedTask;
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}
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logger.LogDebug("HandleClient");
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var connection =
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new ClientScreenServerConnection(socket, loggerFactory.CreateLogger<ClientScreenServerConnection>(), this);
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var added = _connections.TryAdd(connection, 0);
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Debug.Assert(added);
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return connection.Done;
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}
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private void Remove(ClientScreenServerConnection connection)
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{
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_connections.TryRemove(connection, out _);
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}
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public IEnumerable<ClientScreenServerConnection> GetConnections() => _connections.Keys;
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public Task StartAsync(CancellationToken cancellationToken) => Task.CompletedTask;
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public Task StopAsync(CancellationToken cancellationToken) => Task.CompletedTask;
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public Task StartedAsync(CancellationToken cancellationToken) => Task.CompletedTask;
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public Task StartingAsync(CancellationToken cancellationToken) => Task.CompletedTask;
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public Task StoppedAsync(CancellationToken cancellationToken) => Task.CompletedTask;
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internal sealed class ClientScreenServerConnection : IDisposable
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{
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private readonly ByteChannelWebSocket _channel;
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private readonly ILogger<ClientScreenServerConnection> _logger;
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private readonly ClientScreenServer _server;
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private readonly SemaphoreSlim _wantedFrames = new(1);
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private PixelGrid? _lastSentPixels;
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public ClientScreenServerConnection(WebSocket webSocket,
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ILogger<ClientScreenServerConnection> logger,
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ClientScreenServer server)
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{
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_server = server;
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_logger = logger;
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_channel = new ByteChannelWebSocket(webSocket, logger, 0);
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Done = ReceiveAsync();
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}
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public Task Done { get; }
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public void Dispose()
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{
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_wantedFrames.Dispose();
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Done.Dispose();
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}
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public async Task SendAsync(PixelGrid pixels)
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{
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if (_lastSentPixels == pixels)
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return;
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if (!await _wantedFrames.WaitAsync(TimeSpan.Zero))
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{
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_logger.LogTrace("client does not want a frame yet");
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return;
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}
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_logger.LogTrace("sending");
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try
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{
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await _channel.SendAsync(pixels.Data);
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_lastSentPixels = pixels;
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}
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catch (WebSocketException ex)
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{
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_logger.LogWarning(ex, "send failed");
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}
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}
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private async Task ReceiveAsync()
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{
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await foreach (var _ in _channel.ReadAllAsync())
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_wantedFrames.Release();
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_logger.LogTrace("done receiving");
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_server.Remove(this);
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}
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public Task CloseAsync()
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{
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_logger.LogDebug("closing connection");
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return _channel.CloseAsync();
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}
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}
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}
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