barcode-host/Shared/KeyboardMouse/AggregateInputReader.cs

using Barcode.Host.Shared.KeyboardMouse.Abstract;
using Microsoft.Extensions.Logging;

namespace Barcode.Host.Shared.KeyboardMouse;

public class AggregateInputReader : IDisposable, IAggregateInputReader
{
    private readonly ILogger<InputReader> _InputReaderLogger;

    private Dictionary<string, InputReader>? _Readers = new();

    public event InputReader.RaiseKeyPress? OnKeyPress;

    public AggregateInputReader(ILogger<InputReader> inputReaderLogger)
    {
        _InputReaderLogger = inputReaderLogger;

        System.Timers.Timer timer = new()
        {
            Interval = 10 * 1000,
            Enabled = true
        };
        timer.Elapsed += (_, _) => Scan();
        timer.Start();
    }

    private void ReaderOnOnKeyPress(KeyPressEvent e) => OnKeyPress?.Invoke(e);

    private void Scan()
    {
        string[] files = Directory.GetFiles("/dev/input/", "event*");

        foreach (string file in files)
        {
            if (_Readers is not null && _Readers.ContainsKey(file))
            {
                continue;
            }

            InputReader reader = new(file, _InputReaderLogger);

            reader.OnKeyPress += ReaderOnOnKeyPress;

            _Readers?.Add(file, reader);
        }

        IEnumerable<InputReader>? deadReaders = _Readers?.Values.Where(r => r.Faulted);
        if (deadReaders is not null)
        {
            foreach (InputReader? dr in deadReaders)
            {
                _ = _Readers?.Remove(dr.Path);
                dr.OnKeyPress -= ReaderOnOnKeyPress;
                dr.Dispose();
            }
        }
    }

    public void Dispose()
    {
        if (_Readers is not null)
        {
            foreach (InputReader d in _Readers.Values)
            {
                d.OnKeyPress -= ReaderOnOnKeyPress;
                d.Dispose();
            }
        }

        _Readers = null;
    }
}