Moving crawler first call to a startup code

Kyoo.Common/Controllers/ICrawler.cs

@@ -5,8 +5,6 @@ namespace Kyoo.Controllers
 {
     public interface ICrawler
     {
-        void Start();
-
-        void Cancel();
+	    Task StartAsync(CancellationToken cancellationToken);
     }
 }

Kyoo/ClientApp

@@ -1 +1 @@
-Subproject commit 1a7094979c79dd3e50760afbc6bf5b2286e7ab9d
+Subproject commit 1831074c9d21ccc238409b6c21520780ca666bea

Kyoo/Controllers/Crawler.cs

@@ -13,9 +13,6 @@ namespace Kyoo.Controllers
 {
     public class Crawler : ICrawler
     {
-        private bool _isRunning;
-        private readonly CancellationTokenSource _cancellation;
-
         private readonly ILibraryManager _libraryManager;
         private readonly IProviderManager _metadataProvider;
         private readonly ITranscoder _transcoder;
@@ -27,26 +24,9 @@ namespace Kyoo.Controllers
             _metadataProvider = metadataProvider;
             _transcoder = transcoder;
             _config = configuration;
-            _cancellation = new CancellationTokenSource();
         }
 
-        public void Start()
-        {
-            if (_isRunning)
-                return;
-            _isRunning = true;
-            StartAsync(_cancellation.Token);
-        }
-
-        public void Cancel()
-        {
-            if (!_isRunning)
-                return;
-            _isRunning = false;
-            _cancellation.Cancel();
-        }
-
-        private async void StartAsync(CancellationToken cancellationToken)
+        public async Task StartAsync(CancellationToken cancellationToken)
         {
             try
             {
@@ -66,7 +46,6 @@ namespace Kyoo.Controllers
             {
                 Console.Error.WriteLine($"Unknown exception thrown durring libraries scan.\nException: {ex.Message}");
             }
-            _isRunning = false;
             Console.WriteLine("Scan finished!");
         }
 
@@ -204,12 +183,5 @@ namespace Kyoo.Controllers
         {
             return VideoExtensions.Contains(Path.GetExtension(filePath));
         }
-
-
-        public Task StopAsync()
-        {
-            _cancellation.Cancel();
-            return null;
-        }
     }
 }

Kyoo/Controllers/StartupCode.cs

@@ -0,0 +1,34 @@
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+
+namespace Kyoo.Controllers
+{
+	public class StartupCode : BackgroundService
+	{
+		private readonly IServiceProvider _serviceProvider;
+
+		public StartupCode(IServiceProvider serviceProvider)
+		{
+			_serviceProvider = serviceProvider;
+		}
+
+		protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+		{
+			using (IServiceScope serviceScope = _serviceProvider.CreateScope())
+			{
+				serviceScope.ServiceProvider.GetService<DatabaseContext>().Database.EnsureCreated();
+				// Use the next line if the database is not SQLite (SQLite doesn't support complexe migrations).
+				// serviceScope.ServiceProvider.GetService<DatabaseContext>().Database.Migrate();;
+	            
+				IPluginManager pluginManager = serviceScope.ServiceProvider.GetService<IPluginManager>();
+				pluginManager.ReloadPlugins();
+
+				ICrawler crawler = serviceScope.ServiceProvider.GetService<ICrawler>();
+				await crawler.StartAsync(stoppingToken);
+			}
+		}
+	}
+}

Kyoo/HtmlAPI/AdminAPI.cs

@@ -3,6 +3,7 @@ using Microsoft.AspNetCore.Mvc;
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Threading;
 using System.Threading.Tasks;
 
 namespace Kyoo.Controllers
@@ -21,7 +22,7 @@ namespace Kyoo.Controllers
         [HttpGet("scan")]
         public IActionResult ScanLibrary()
         {
-            crawler.Start();
+            crawler.StartAsync(new CancellationToken());
             return Ok("Scanning");
         }
     }

Kyoo/Program.cs

@@ -11,22 +11,8 @@ namespace Kyoo
     {
         public static async Task Main(string[] args)
         {
-            IWebHost host = CreateWebHostBuilder(args).Build();
-
             Console.WriteLine($"Running as: {Environment.UserName}");
-            using (IServiceScope serviceScope = host.Services.CreateScope())
-            {
-	            serviceScope.ServiceProvider.GetService<DatabaseContext>().Database.EnsureCreated();;
-	            // Use the next line if the database is not SQLite (SQLite doesn't support complexe migrations).
-	            // serviceScope.ServiceProvider.GetService<DatabaseContext>().Database.Migrate();;
-	            
-                IPluginManager pluginManager = serviceScope.ServiceProvider.GetService<IPluginManager>();
-                pluginManager.ReloadPlugins();
-
-                ICrawler crawler = serviceScope.ServiceProvider.GetService<ICrawler>();
-                crawler.Start();
-            }
-            await host.RunAsync();
+            await CreateWebHostBuilder(args).Build().RunAsync();
         }
 
         public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>

Kyoo/Startup.cs

@@ -45,6 +45,8 @@ namespace Kyoo
             services.AddSingleton<IProviderManager, ProviderManager>();
             services.AddScoped<ICrawler, Crawler>();
             services.AddSingleton<IPluginManager, PluginManager>();
+            
+            services.AddHostedService<StartupCode>();
         }
 
         // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.