public static CSharpKernel UseAspNetCore(this CSharpKernel kernel)
{
InteractiveHost interactiveHost = null;
var directive = new Command("#!aspnet", "Activate ASP.NET Core")
{
Handler = CommandHandler.Create(async() =>
{
if (interactiveHost is {})
{
return;
}
var interactiveLoggerProvider = new InteractiveLoggerProvider();
kernel.AddMiddleware(async(command, context, next) =>
{
// REVIEW: Is there a way to log even when there's no command in progress?
// This is currently necessary because the #!log command uses KernelInvocationContext.Current in
// its LogEvents.Subscribe callback and KernelInvocationContext.Current is backed by an AsyncLocal.
// Is there a way to log to diagnostic output without KernelInvocationContext.Current?
using (command is SubmitCode ? interactiveLoggerProvider.SubscribePocketLogerWithCurrentEC() : null)
{
await next(command, context).ConfigureAwait(false);
}
});
// The middleware doesn't cover the current command's executions so we need this to capture startup logs.
using (interactiveLoggerProvider.SubscribePocketLogerWithCurrentEC())
{
// We could try to manage the host's lifetime, but for now just stop the kernel if you want to stop the host.
interactiveHost = new InteractiveHost(interactiveLoggerProvider);
var startHostTask = interactiveHost.StartAsync();
var rDirectives = string.Join(Environment.NewLine, _references.Select(a => $"#r \"{a.Location}\""));
var usings = string.Join(Environment.NewLine, _namespaces.Select(ns => $"using {ns};"));
await kernel.SendAsync(new SubmitCode($"{rDirectives}{Environment.NewLine}{usings}"), CancellationToken.None).ConfigureAwait(false);
await startHostTask.ConfigureAwait(false);
var httpClient = HttpClientFormatter.CreateEnhancedHttpClient(interactiveHost.Address, interactiveLoggerProvider);
await kernel.SetValueAsync <IApplicationBuilder>("App", interactiveHost.App).ConfigureAwait(false);
await kernel.SetValueAsync <IEndpointRouteBuilder>("Endpoints", interactiveHost.Endpoints).ConfigureAwait(false);
await kernel.SetValueAsync <HttpClient>("HttpClient", httpClient).ConfigureAwait(false);
}
})
};
public InteractiveHost(InteractiveLoggerProvider interactiveLoggerProvider)
{
_interactiveLoggerProvider = interactiveLoggerProvider;
_startup = new Startup();
Environment.SetEnvironmentVariable($"ASPNETCORE_{WebHostDefaults.PreventHostingStartupKey}", "true");
var hostBuilder = Host.CreateDefaultBuilder()
.ConfigureWebHostDefaults(webBuilder => webBuilder
.ConfigureKestrel(kestrelOptions => kestrelOptions.Listen(IPAddress.Loopback, 0))
.UseStartup(_ => _startup))
.ConfigureLogging(loggingBuilder => loggingBuilder
.SetMinimumLevel(LogLevel.Trace)
.ClearProviders()
.AddProvider(_interactiveLoggerProvider));
_host = hostBuilder.Build();
}
public InteractiveLogger(InteractiveLoggerProvider loggerProvider, string categoryName)
{
_loggerProvider = loggerProvider;
_categoryName = categoryName;
}