private void ExecuteHostingStartups()
{
var webHostOptions = new WebHostOptions(_config, Assembly.GetEntryAssembly()?.GetName().Name ?? string.Empty);
if (webHostOptions.PreventHostingStartup)
{
return;
}
var exceptions = new List <Exception>();
var processed = new HashSet <Assembly>();
_hostingStartupWebHostBuilder = new HostingStartupWebHostBuilder(this);
// Execute the hosting startup assemblies
foreach (var assemblyName in webHostOptions.GetFinalHostingStartupAssemblies())
{
try
{
var assembly = Assembly.Load(new AssemblyName(assemblyName));
if (!processed.Add(assembly))
{
// Already processed, skip it
continue;
}
foreach (var attribute in assembly.GetCustomAttributes <HostingStartupAttribute>())
{
var hostingStartup = (IHostingStartup)Activator.CreateInstance(attribute.HostingStartupType) !;
hostingStartup.Configure(_hostingStartupWebHostBuilder);
}
}
catch (Exception ex)
{
// Capture any errors that happen during startup
exceptions.Add(new InvalidOperationException($"Startup assembly {assemblyName} failed to execute. See the inner exception for more details.", ex));
}
}
if (exceptions.Count > 0)
{
_hostingStartupErrors = new AggregateException(exceptions);
}
}
public WebHost(
IServiceCollection appServices,
IServiceProvider hostingServiceProvider,
WebHostOptions options,
IConfiguration config,
AggregateException?hostingStartupErrors)
{
if (appServices == null)
{
throw new ArgumentNullException(nameof(appServices));
}
if (hostingServiceProvider == null)
{
throw new ArgumentNullException(nameof(hostingServiceProvider));
}
if (config == null)
{
throw new ArgumentNullException(nameof(config));
}
_config = config;
_hostingStartupErrors = hostingStartupErrors;
_options = options;
_applicationServiceCollection = appServices;
_hostingServiceProvider = hostingServiceProvider;
_applicationServiceCollection.AddSingleton <ApplicationLifetime>();
// There's no way to to register multiple service types per definition. See https://github.com/aspnet/DependencyInjection/issues/360
#pragma warning disable CS8634 // The type cannot be used as type parameter in the generic type or method. Nullability of type argument doesn't match 'class' constraint.
_applicationServiceCollection.AddSingleton(services
=> services.GetService <ApplicationLifetime>() as IHostApplicationLifetime);
#pragma warning disable CS0618 // Type or member is obsolete
_applicationServiceCollection.AddSingleton(services
=> services.GetService <ApplicationLifetime>() as AspNetCore.Hosting.IApplicationLifetime);
_applicationServiceCollection.AddSingleton(services
=> services.GetService <ApplicationLifetime>() as Extensions.Hosting.IApplicationLifetime);
#pragma warning restore CS0618 // Type or member is obsolete
#pragma warning restore CS8634 // The type cannot be used as type parameter in the generic type or method. Nullability of type argument doesn't match 'class' constraint.
_applicationServiceCollection.AddSingleton <HostedServiceExecutor>();
}
private WebHostBuilderContext GetWebHostBuilderContext(HostBuilderContext context)
{
if (!context.Properties.TryGetValue(typeof(WebHostBuilderContext), out var contextVal))
{
var options = new WebHostOptions(context.Configuration, Assembly.GetEntryAssembly()?.GetName().Name ?? string.Empty);
var webHostBuilderContext = new WebHostBuilderContext
{
Configuration = context.Configuration,
HostingEnvironment = new HostingEnvironment(),
};
webHostBuilderContext.HostingEnvironment.Initialize(context.HostingEnvironment.ContentRootPath, options);
context.Properties[typeof(WebHostBuilderContext)] = webHostBuilderContext;
context.Properties[typeof(WebHostOptions)] = options;
return(webHostBuilderContext);
}
// Refresh config, it's periodically updated/replaced
var webHostContext = (WebHostBuilderContext)contextVal;
webHostContext.Configuration = context.Configuration;
return(webHostContext);
}
internal static void Initialize(this IWebHostEnvironment hostingEnvironment, string contentRootPath, WebHostOptions options)
{
if (options == null)
{
throw new ArgumentNullException(nameof(options));
}
if (string.IsNullOrEmpty(contentRootPath))
{
throw new ArgumentException("A valid non-empty content root must be provided.", nameof(contentRootPath));
}
if (!Directory.Exists(contentRootPath))
{
throw new ArgumentException($"The content root '{contentRootPath}' does not exist.", nameof(contentRootPath));
}
hostingEnvironment.ApplicationName = options.ApplicationName;
hostingEnvironment.ContentRootPath = contentRootPath;
hostingEnvironment.ContentRootFileProvider = new PhysicalFileProvider(hostingEnvironment.ContentRootPath);
var webRoot = options.WebRoot;
if (webRoot == null)
{
// Default to /wwwroot if it exists.
var wwwroot = Path.Combine(hostingEnvironment.ContentRootPath, "wwwroot");
if (Directory.Exists(wwwroot))
{
hostingEnvironment.WebRootPath = wwwroot;
}
}
else
{
hostingEnvironment.WebRootPath = Path.Combine(hostingEnvironment.ContentRootPath, webRoot);
}
if (!string.IsNullOrEmpty(hostingEnvironment.WebRootPath))
{
hostingEnvironment.WebRootPath = Path.GetFullPath(hostingEnvironment.WebRootPath);
if (!Directory.Exists(hostingEnvironment.WebRootPath))
{
Directory.CreateDirectory(hostingEnvironment.WebRootPath);
}
hostingEnvironment.WebRootFileProvider = new PhysicalFileProvider(hostingEnvironment.WebRootPath);
}
else
{
hostingEnvironment.WebRootFileProvider = new NullFileProvider();
}
hostingEnvironment.EnvironmentName =
options.Environment ??
hostingEnvironment.EnvironmentName;
}
private IServiceCollection BuildCommonServices(out AggregateException hostingStartupErrors)
{
hostingStartupErrors = null;
_options = new WebHostOptions(_config, Assembly.GetEntryAssembly()?.GetName().Name);
if (!_options.PreventHostingStartup)
{
var exceptions = new List <Exception>();
// Execute the hosting startup assemblies
foreach (var assemblyName in _options.GetFinalHostingStartupAssemblies().Distinct(StringComparer.OrdinalIgnoreCase))
{
try
{
var assembly = Assembly.Load(new AssemblyName(assemblyName));
foreach (var attribute in assembly.GetCustomAttributes <HostingStartupAttribute>())
{
var hostingStartup = (IHostingStartup)Activator.CreateInstance(attribute.HostingStartupType);
hostingStartup.Configure(this);
}
}
catch (Exception ex)
{
// Capture any errors that happen during startup
exceptions.Add(new InvalidOperationException($"Startup assembly {assemblyName} failed to execute. See the inner exception for more details.", ex));
}
}
if (exceptions.Count > 0)
{
hostingStartupErrors = new AggregateException(exceptions);
}
}
var contentRootPath = ResolveContentRootPath(_options.ContentRootPath, AppContext.BaseDirectory);
// Initialize the hosting environment
_hostingEnvironment.Initialize(contentRootPath, _options);
_context.HostingEnvironment = _hostingEnvironment;
var services = new ServiceCollection();
services.AddSingleton(_options);
services.AddSingleton <IHostingEnvironment>(_hostingEnvironment);
services.AddSingleton <Extensions.Hosting.IHostingEnvironment>(_hostingEnvironment);
services.AddSingleton(_context);
var builder = new ConfigurationBuilder()
.SetBasePath(_hostingEnvironment.ContentRootPath)
.AddConfiguration(_config);
_configureAppConfigurationBuilder?.Invoke(_context, builder);
var configuration = builder.Build();
services.AddSingleton <IConfiguration>(configuration);
_context.Configuration = configuration;
var listener = new DiagnosticListener("Microsoft.AspNetCore");
services.AddSingleton <DiagnosticListener>(listener);
services.AddSingleton <DiagnosticSource>(listener);
services.AddTransient <IApplicationBuilderFactory, ApplicationBuilderFactory>();
services.AddTransient <IHttpContextFactory, HttpContextFactory>();
services.AddScoped <IMiddlewareFactory, MiddlewareFactory>();
services.AddOptions();
services.AddLogging();
// Conjure up a RequestServices
services.AddTransient <IStartupFilter, AutoRequestServicesStartupFilter>();
services.AddTransient <IServiceProviderFactory <IServiceCollection>, DefaultServiceProviderFactory>();
// Ensure object pooling is available everywhere.
services.AddSingleton <ObjectPoolProvider, DefaultObjectPoolProvider>();
if (!string.IsNullOrEmpty(_options.StartupAssembly))
{
try
{
var startupType = StartupLoader.FindStartupType(_options.StartupAssembly, _hostingEnvironment.EnvironmentName);
if (typeof(IStartup).GetTypeInfo().IsAssignableFrom(startupType.GetTypeInfo()))
{
services.AddSingleton(typeof(IStartup), startupType);
}
else
{
services.AddSingleton(typeof(IStartup), sp =>
{
var hostingEnvironment = sp.GetRequiredService <IHostingEnvironment>();
var methods = StartupLoader.LoadMethods(sp, startupType, hostingEnvironment.EnvironmentName);
return(new ConventionBasedStartup(methods));
});
}
}
catch (Exception ex)
{
var capture = ExceptionDispatchInfo.Capture(ex);
services.AddSingleton <IStartup>(_ =>
{
capture.Throw();
return(null);
});
}
}
_configureServices?.Invoke(_context, services);
return(services);
}
private IServiceCollection BuildHostingServices()
{
_options = new WebHostOptions(_config);
var appEnvironment = PlatformServices.Default.Application;
var contentRootPath = ResolveContentRootPath(_options.ContentRootPath, appEnvironment.ApplicationBasePath);
var applicationName = _options.ApplicationName ?? appEnvironment.ApplicationName;
// Initialize the hosting environment
_hostingEnvironment.Initialize(applicationName, contentRootPath, _options);
var services = new ServiceCollection();
services.AddSingleton(_hostingEnvironment);
if (_loggerFactory == null)
{
_loggerFactory = new LoggerFactory();
}
foreach (var configureLogging in _configureLoggingDelegates)
{
configureLogging(_loggerFactory);
}
//The configured ILoggerFactory is added as a singleton here. AddLogging below will not add an additional one.
services.AddSingleton(_loggerFactory);
//This is required to add ILogger of T.
services.AddLogging();
services.AddTransient <IApplicationBuilderFactory, ApplicationBuilderFactory>();
services.AddTransient <IHttpContextFactory, HttpContextFactory>();
services.AddOptions();
var diagnosticSource = new DiagnosticListener("Microsoft.AspNetCore");
services.AddSingleton <DiagnosticSource>(diagnosticSource);
services.AddSingleton <DiagnosticListener>(diagnosticSource);
// Conjure up a RequestServices
services.AddTransient <IStartupFilter, AutoRequestServicesStartupFilter>();
// Ensure object pooling is available everywhere.
services.AddSingleton <ObjectPoolProvider, DefaultObjectPoolProvider>();
if (!string.IsNullOrEmpty(_options.ServerAssembly))
{
// Add the server
try
{
var serverType = ServerLoader.ResolveServerType(_options.ServerAssembly);
services.AddSingleton(typeof(IServer), serverType);
}
catch (Exception ex)
{
var capture = ExceptionDispatchInfo.Capture(ex);
services.AddSingleton <IServer>(_ =>
{
capture.Throw();
return(null);
});
}
}
if (!string.IsNullOrEmpty(_options.StartupAssembly))
{
try
{
var startupType = StartupLoader.FindStartupType(_options.StartupAssembly, _hostingEnvironment.EnvironmentName);
if (typeof(IStartup).GetTypeInfo().IsAssignableFrom(startupType.GetTypeInfo()))
{
services.AddSingleton(typeof(IStartup), startupType);
}
else
{
services.AddSingleton(typeof(IStartup), sp =>
{
var hostingEnvironment = sp.GetRequiredService <IHostingEnvironment>();
var methods = StartupLoader.LoadMethods(sp, startupType, hostingEnvironment.EnvironmentName);
return(new ConventionBasedStartup(methods));
});
}
}
catch (Exception ex)
{
var capture = ExceptionDispatchInfo.Capture(ex);
services.AddSingleton <IStartup>(_ =>
{
capture.Throw();
return(null);
});
}
}
foreach (var configureServices in _configureServicesDelegates)
{
configureServices(services);
}
return(services);
}
private IServiceCollection BuildHostingServices()
{
_options = new WebHostOptions(_config);
var appEnvironment = PlatformServices.Default.Application;
var contentRootPath = ResolveContentRootPath(_options.ContentRootPath, appEnvironment.ApplicationBasePath);
var applicationName = ResolveApplicationName() ?? appEnvironment.ApplicationName;
// Initialize the hosting environment
_hostingEnvironment.Initialize(applicationName, contentRootPath, _options);
var services = new ServiceCollection();
services.AddSingleton(_hostingEnvironment);
if (_loggerFactory == null)
{
_loggerFactory = new LoggerFactory();
}
foreach (var configureLogging in _configureLoggingDelegates)
{
configureLogging(_loggerFactory);
}
//The configured ILoggerFactory is added as a singleton here. AddLogging below will not add an additional one.
services.AddSingleton(_loggerFactory);
//This is required to add ILogger of T.
services.AddLogging();
services.AddTransient <IStartupLoader, StartupLoader>();
services.AddTransient <IApplicationBuilderFactory, ApplicationBuilderFactory>();
services.AddTransient <IHttpContextFactory, HttpContextFactory>();
services.AddOptions();
var diagnosticSource = new DiagnosticListener("Microsoft.AspNetCore");
services.AddSingleton <DiagnosticSource>(diagnosticSource);
services.AddSingleton <DiagnosticListener>(diagnosticSource);
// Conjure up a RequestServices
services.AddTransient <IStartupFilter, AutoRequestServicesStartupFilter>();
// Ensure object pooling is available everywhere.
services.AddSingleton <ObjectPoolProvider, DefaultObjectPoolProvider>();
if (!string.IsNullOrEmpty(_options.ServerAssembly))
{
// Add the server
var serverType = ServerLoader.ResolveServerType(_options.ServerAssembly);
services.AddSingleton(typeof(IServer), serverType);
}
foreach (var configureServices in _configureServicesDelegates)
{
configureServices(services);
}
return(services);
}
