public WebHostOptions(IConfiguration configuration, string applicationNameFallback)
{
if (configuration == null)
{
throw new ArgumentNullException(nameof(configuration));
}
ApplicationName = configuration[WebHostDefaults.ApplicationKey] ?? applicationNameFallback;
StartupAssembly = configuration[WebHostDefaults.StartupAssemblyKey];
DetailedErrors = WebHostUtilities.ParseBool(configuration, WebHostDefaults.DetailedErrorsKey);
CaptureStartupErrors = WebHostUtilities.ParseBool(configuration, WebHostDefaults.CaptureStartupErrorsKey);
Environment = configuration[WebHostDefaults.EnvironmentKey];
WebRoot = configuration[WebHostDefaults.WebRootKey];
ContentRootPath = configuration[WebHostDefaults.ContentRootKey];
PreventHostingStartup = WebHostUtilities.ParseBool(configuration, WebHostDefaults.PreventHostingStartupKey);
// Search the primary assembly and configured assemblies.
HostingStartupAssemblies = $"{ApplicationName};{configuration[WebHostDefaults.HostingStartupAssembliesKey]}"
.Split(new[] { ';' }, StringSplitOptions.RemoveEmptyEntries) ?? new string[0];
var timeout = configuration[WebHostDefaults.ShutdownTimeoutKey];
if (!string.IsNullOrEmpty(timeout) &&
int.TryParse(timeout, NumberStyles.None, CultureInfo.InvariantCulture, out var seconds))
{
ShutdownTimeout = TimeSpan.FromSeconds(seconds);
}
}
private void EnsureServer()
{
if (Server == null)
{
Server = _applicationServices.GetRequiredService <IServer>();
var serverAddressesFeature = Server.Features?.Get <IServerAddressesFeature>();
var addresses = serverAddressesFeature?.Addresses;
if (addresses != null && !addresses.IsReadOnly && addresses.Count == 0)
{
var urls = _config[WebHostDefaults.ServerUrlsKey] ?? _config[DeprecatedServerUrlsKey];
if (!string.IsNullOrEmpty(urls))
{
serverAddressesFeature.PreferHostingUrls = WebHostUtilities.ParseBool(_config, WebHostDefaults.PreferHostingUrlsKey);
foreach (var value in urls.Split(new[] { ';' }, StringSplitOptions.RemoveEmptyEntries))
{
addresses.Add(value);
}
}
}
}
}
public async Task StartAsync(CancellationToken cancellationToken)
{
HostingEventSource.Log.HostStart();
var serverAddressesFeature = Server.Features?.Get <IServerAddressesFeature>();
var addresses = serverAddressesFeature?.Addresses;
if (addresses != null && !addresses.IsReadOnly && addresses.Count == 0)
{
var urls = Configuration[WebHostDefaults.ServerUrlsKey];
if (!string.IsNullOrEmpty(urls))
{
serverAddressesFeature.PreferHostingUrls = WebHostUtilities.ParseBool(Configuration, WebHostDefaults.PreferHostingUrlsKey);
foreach (var value in urls.Split(new[] { ';' }, StringSplitOptions.RemoveEmptyEntries))
{
addresses.Add(value);
}
}
}
RequestDelegate application = null;
try
{
Action <IApplicationBuilder> configure = Options.ConfigureApplication;
if (configure == null)
{
throw new InvalidOperationException($"No application configured. Please specify an application via IWebHostBuilder.UseStartup, IWebHostBuilder.Configure, or specifying the startup assembly via {nameof(WebHostDefaults.StartupAssemblyKey)} in the web host configuration.");
}
var builder = ApplicationBuilderFactory.CreateBuilder(Server.Features);
foreach (var filter in StartupFilters.Reverse())
{
configure = filter.Configure(configure);
}
configure(builder);
// Build the request pipeline
application = builder.Build();
}
catch (Exception ex)
{
Logger.ApplicationError(ex);
if (!Options.WebHostOptions.CaptureStartupErrors)
{
throw;
}
application = BuildErrorPageApplication(ex);
}
var httpApplication = new HostingApplication(application, Logger, DiagnosticListener, HttpContextFactory);
await Server.StartAsync(httpApplication, cancellationToken);
if (addresses != null)
{
foreach (var address in addresses)
{
LifetimeLogger.LogInformation("Now listening on: {address}", address);
}
}
if (Logger.IsEnabled(LogLevel.Debug))
{
foreach (var assembly in Options.WebHostOptions.GetFinalHostingStartupAssemblies())
{
Logger.LogDebug("Loaded hosting startup assembly {assemblyName}", assembly);
}
}
if (Options.HostingStartupExceptions != null)
{
foreach (var exception in Options.HostingStartupExceptions.InnerExceptions)
{
Logger.HostingStartupAssemblyError(exception);
}
}
}