72 lines
2 KiB
C#
72 lines
2 KiB
C#
using System.Net.WebSockets;
|
|
using System.Threading;
|
|
using Microsoft.Extensions.Logging;
|
|
|
|
namespace TanksServer;
|
|
|
|
internal abstract class EasyWebSocket
|
|
{
|
|
private readonly TaskCompletionSource _completionSource = new();
|
|
|
|
private readonly ILogger _logger;
|
|
private readonly WebSocket _socket;
|
|
private readonly Task _readLoop;
|
|
private readonly ArraySegment<byte> _buffer;
|
|
private int _closed;
|
|
|
|
protected EasyWebSocket(WebSocket socket, ILogger logger, ArraySegment<byte> buffer)
|
|
{
|
|
_socket = socket;
|
|
_logger = logger;
|
|
_buffer = buffer;
|
|
_readLoop = ReadLoopAsync();
|
|
}
|
|
|
|
public Task Done => _completionSource.Task;
|
|
|
|
private async Task ReadLoopAsync()
|
|
{
|
|
do
|
|
{
|
|
var response = await _socket.ReceiveAsync(_buffer, CancellationToken.None);
|
|
if (response.CloseStatus.HasValue)
|
|
break;
|
|
|
|
await ReceiveAsync(_buffer[..response.Count]);
|
|
} while (_socket.State == WebSocketState.Open);
|
|
|
|
await CloseAsync();
|
|
}
|
|
|
|
protected abstract Task ReceiveAsync(ArraySegment<byte> buffer);
|
|
protected abstract Task ClosingAsync();
|
|
|
|
protected async Task TrySendAsync(byte[] data)
|
|
{
|
|
if (_socket.State != WebSocketState.Open)
|
|
await CloseAsync();
|
|
|
|
_logger.LogTrace("sending {} bytes of data", _buffer.Count);
|
|
|
|
try
|
|
{
|
|
await _socket.SendAsync(data, WebSocketMessageType.Binary, true, CancellationToken.None);
|
|
}
|
|
catch (WebSocketException wsEx)
|
|
{
|
|
_logger.LogDebug(wsEx, "send failed");
|
|
}
|
|
}
|
|
|
|
public async Task CloseAsync()
|
|
{
|
|
if (Interlocked.Exchange(ref _closed, 1) == 1)
|
|
return;
|
|
_logger.LogDebug("closing socket");
|
|
await _socket.CloseAsync(WebSocketCloseStatus.NormalClosure, null, CancellationToken.None);
|
|
await _readLoop;
|
|
await ClosingAsync();
|
|
_completionSource.SetResult();
|
|
}
|
|
}
|