ersatztv/ErsatzTV/Services/RunOnce/PlatformSettingsService.cs

using System.Linq;
using System.Runtime.InteropServices;
using System.Threading;
using System.Threading.Tasks;
using ErsatzTV.Core.Interfaces.Metadata;
using ErsatzTV.Core.Interfaces.Runtime;
using ErsatzTV.Infrastructure.Data;
using Microsoft.Extensions.Caching.Memory;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;

namespace ErsatzTV.Services.RunOnce
{
    public class PlatformSettingsService : IHostedService
    {
        private readonly ILogger<PlatformSettingsService> _logger;
        private readonly IServiceScopeFactory _serviceScopeFactory;

        public PlatformSettingsService(
            IServiceScopeFactory serviceScopeFactory,
            ILogger<PlatformSettingsService> logger)
        {
            _serviceScopeFactory = serviceScopeFactory;
            _logger = logger;
        }

        public async Task StartAsync(CancellationToken cancellationToken)
        {
            using IServiceScope scope = _serviceScopeFactory.CreateScope();
            await using TvContext dbContext = scope.ServiceProvider.GetRequiredService<TvContext>();

            IRuntimeInfo runtimeInfo = scope.ServiceProvider.GetRequiredService<IRuntimeInfo>();
            if (runtimeInfo != null && runtimeInfo.IsOSPlatform(OSPlatform.Linux) &&
                System.IO.Directory.Exists("/dev/dri"))
            {
                ILocalFileSystem localFileSystem = scope.ServiceProvider.GetRequiredService<ILocalFileSystem>();
                IMemoryCache memoryCache = scope.ServiceProvider.GetRequiredService<IMemoryCache>();

                var devices = localFileSystem.ListFiles("/dev/dri")
                    .Filter(s => s.StartsWith("/dev/dri/render"))
                    .ToList();

                memoryCache.Set("ffmpeg.render_devices", devices);
            }
        }

        public Task StopAsync(CancellationToken cancellationToken) => Task.CompletedTask;
    }
}