private static string DetermineOwinServer(StartContext context)
{
StartOptions options = context.Options;
IDictionary <string, string> settings = context.Options.Settings;
string serverName = options.ServerFactory;
if (!string.IsNullOrWhiteSpace(serverName))
{
return(serverName);
}
if (settings != null &&
settings.TryGetValue(Constants.SettingsOwinServer, out serverName) &&
!string.IsNullOrWhiteSpace(serverName))
{
return(serverName);
}
serverName = Environment.GetEnvironmentVariable(Constants.EnvOwnServer, EnvironmentVariableTarget.Process);
if (!string.IsNullOrWhiteSpace(serverName))
{
return(serverName);
}
return(Constants.DefaultServer);
}
private static IDisposable EnableDisposing(StartContext context)
{
var cts = new CancellationTokenSource();
context.Builder.Properties[Constants.HostOnAppDisposing] = cts.Token;
context.EnvironmentData.Add(new KeyValuePair <string, object>(Constants.HostOnAppDisposing, cts.Token));
return(new Disposable(() => cts.Cancel(false)));
}
private void ResolveOutput(StartContext context)
{
if (context.TraceOutput == null)
{
context.Options.Settings.TryGetValue("traceoutput", out string traceoutput);
context.TraceOutput = _traceOutputFactory.Create(traceoutput);
}
context.EnvironmentData.Add(new KeyValuePair <string, object>(Constants.HostTraceOutput, context.TraceOutput));
}
private void ResolveServerFactory(StartContext context)
{
if (context.ServerFactory != null)
{
return;
}
string serverName = DetermineOwinServer(context);
context.ServerFactory = _serverFactoryLoader.Load(serverName);
}
/// <summary>
///
/// </summary>
/// <param name="appBuilderFactory"></param>
/// <param name="traceOutputFactory"></param>
/// <param name="appLoader"></param>
/// <param name="serverFactoryLoader"></param>
/// <param name="loggerFactory"></param>
public HostingEngine(
IServiceProvider serviceProvider,
IAppBuilderFactory appBuilderFactory,
ITraceOutputFactory traceOutputFactory,
IAppLoader appLoader,
IServerFactoryLoader serverFactoryLoader,
IOptions <StartOptions> options)
{
_appBuilderFactory = appBuilderFactory ?? throw new ArgumentNullException("appBuilderFactory");
_traceOutputFactory = traceOutputFactory ?? throw new ArgumentNullException("traceOutputFactory");
_appLoader = appLoader ?? throw new ArgumentNullException("appLoader");
_serverFactoryLoader = serverFactoryLoader;
_serviceProvider = serviceProvider;
this._context = new StartContext(options.Value);
}
private void EnableTracing(StartContext context)
{
// string etwGuid = "CB50EAF9-025E-4CFB-A918-ED0F7C0CD0FA";
// EventProviderTraceListener etwListener = new EventProviderTraceListener(etwGuid, "HostingEtwListener", "::");
var textListener = new TextWriterTraceListener(context.TraceOutput, "HostingTraceListener");
Trace.Listeners.Add(textListener);
// Trace.Listeners.Add(etwListener);
var source = new TraceSource("HostingTraceSource", SourceLevels.All);
source.Listeners.Add(textListener);
// source.Listeners.Add(etwListener);
context.Builder.Properties[Constants.HostTraceOutput] = context.TraceOutput;
context.Builder.Properties[Constants.HostTraceSource] = source;
}
private static string DetermineApplicationName(StartContext context)
{
StartOptions options = context.Options;
IDictionary <string, string> settings = context.Options.Settings;
if (options != null && !string.IsNullOrWhiteSpace(options.AppStartup))
{
return(options.AppStartup);
}
if (settings.TryGetValue(Constants.SettingsOwinAppStartup, out string appName) &&
!string.IsNullOrWhiteSpace(appName))
{
return(appName);
}
return(null);
}
private void ResolveApp(StartContext context)
{
context.Builder.Use(typeof(Encapsulate), context.EnvironmentData);
if (context.App == null)
{
IList <string> errors = new List <string>();
if (context.Startup == null)
{
string appName = DetermineApplicationName(context);
context.Startup = _appLoader.Load(appName, errors);
}
context.Startup(context.Builder);
}
else
{
context.Builder.Use(new Func <object, object>(_ => context.App));
}
}
private void InitializeBuilder(StartContext context)
{
if (context.Builder == null)
{
context.Builder = _appBuilderFactory.Create();
}
if (!string.IsNullOrWhiteSpace(context.Options.AppStartup))
{
context.Builder.Properties[Constants.HostAppName] = context.Options.AppStartup;
context.EnvironmentData.Add(new KeyValuePair <string, object>(Constants.HostAppName, context.Options.AppStartup));
}
// This key lets us know the app was launched from Visual Studio.
string vsVersion = Environment.GetEnvironmentVariable("VisualStudioVersion");
if (!string.IsNullOrWhiteSpace(vsVersion))
{
context.Builder.Properties[Constants.HostAppMode] = Constants.AppModeDevelopment;
context.EnvironmentData.Add(new KeyValuePair <string, object>(Constants.HostAppMode, Constants.AppModeDevelopment));
}
context.Builder.SetServiceProvider(_serviceProvider);
}
private static IDisposable StartServer(StartContext context)
{
return(context.ServerFactory.Create(context.Builder));
}
private static void InitializeServerFactory(StartContext context)
{
context.ServerFactory.Initialize(context.Builder);
}