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  • Heather Floyd 610 posts 1033 karma points MVP 6x c-trib
    Jul 08, 2023 @ 04:24
    Heather Floyd
    1

    Dependency Injection - when one service relies on another and blows up the boot

    I'm struggling with a weird issue that is causing the dreaded "HTTP Error 500.30 - ASP.NET Core app failed to start" message. Checking the Windows Event Viewer - the specific error is "System.InvalidOperationException: Wasn't able to get an UmbracoContext"

    Description: The process was terminated due to an unhandled exception.
Exception Info: System.InvalidOperationException: Wasn't able to get an UmbracoContext
   at Umbraco.Extensions.UmbracoContextAccessorExtensions.GetRequiredUmbracoContext(IUmbracoContextAccessor umbracoContextAccessor)
   at Umbraco.Cms.Infrastructure.DependencyInjection.UmbracoBuilderExtensions.<>c.<AddCoreInitialServices>b__0_11(IServiceProvider factory)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSiteMain(ServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitRootCache(ServiceCallSite callSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitScopeCache(ServiceCallSite callSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSite(ServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitConstructor(ConstructorCallSite constructorCallSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSiteMain(ServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitRootCache(ServiceCallSite callSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitScopeCache(ServiceCallSite callSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSite(ServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitConstructor(ConstructorCallSite constructorCallSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSiteMain(ServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitRootCache(ServiceCallSite callSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitScopeCache(ServiceCallSite callSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSite(ServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitConstructor(ConstructorCallSite constructorCallSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSiteMain(ServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitRootCache(ServiceCallSite callSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSite(ServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitConstructor(ConstructorCallSite constructorCallSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSiteMain(ServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSite(ServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitIEnumerable(IEnumerableCallSite enumerableCallSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSiteMain(ServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSite(ServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.Resolve(ServiceCallSite callSite, ServiceProviderEngineScope scope)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.DynamicServiceProviderEngine.<>c__DisplayClass2_0.<RealizeService>b__0(ServiceProviderEngineScope scope)
   at Microsoft.Extensions.DependencyInjection.ServiceProvider.GetService(Type serviceType, ServiceProviderEngineScope serviceProviderEngineScope)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngineScope.GetService(Type serviceType)
   at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService(IServiceProvider provider, Type serviceType)
   at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService[T](IServiceProvider provider)
   at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetServices[T](IServiceProvider provider)
   at Umbraco.Cms.Core.Events.NotificationHandlerWrapperImpl`1.Handle(INotification notification, ServiceFactory serviceFactory, Action`2 publish)
   at Umbraco.Cms.Core.Events.EventAggregator.PublishNotification(INotification notification)
   at Umbraco.Cms.Core.Events.EventAggregator.PublishAsync[TNotification](TNotification notification, CancellationToken cancellationToken)
   at Umbraco.Cms.Infrastructure.Runtime.CoreRuntime.StartAsync(CancellationToken cancellationToken, Boolean isRestarting)
   at Umbraco.Cms.Infrastructure.Runtime.CoreRuntime.StartAsync(CancellationToken cancellationToken)
   at Microsoft.Extensions.Hosting.Internal.Host.StartAsync(CancellationToken cancellationToken)
   at Microsoft.Extensions.Hosting.HostingAbstractionsHostExtensions.RunAsync(IHost host, CancellationToken token)
   at Microsoft.Extensions.Hosting.HostingAbstractionsHostExtensions.RunAsync(IHost host, CancellationToken token)
   at Microsoft.Extensions.Hosting.HostingAbstractionsHostExtensions.Run(IHost host)
   at UmbracoProject.Program.Main(String[] args) in C:\Users\Heather\WEBS\Clients\LOYD\American Regent\sourcecode-10\src\UmbracoProject\Program.cs:line 6

    What seems to be causing the error is a DI service I am adding via the Startup.cs which relies on another injected service.

    Here is a simplified example of what I mean:

    Startup.cs

    public void ConfigureServices(IServiceCollection services)
{
        ...
        services.AddScoped<SiteHelperService>();
        ...
        services.AddScoped<IPageRenderer, BaseModelPageRenderer>();
        ...
}

    BaseModelPageRenderer relies upon SiteHelperService:

    BaseModelPageRenderer.cs

    public BaseModelPageRenderer(
            ILogger<BaseModelPageRenderer> logger,
            IUmbracoContextAccessor umbracoContextAccessor,
            IVariationContextAccessor variationContextAccessor,
            IHttpContextAccessor httpContextAccessor,
            SiteHelperService siteHelperService)
        {...}

    SiteHelperService.cs

    public SiteHelperService(
            ILogger<SiteHelperService> logger,
            IConfiguration AppSettingsConfig,
            IHttpContextAccessor ContextAccessor,
            IUmbracoContextAccessor UmbracoContextAccessor,
            IFileService fileService,
            IContentTypeService ContentTypeService)
        {...}

    If I comment-out the line in 'Startup':

    //services.AddScoped<IPageRenderer, BaseModelPageRenderer>();

    Then the site will load just fine.

    OR if I leave that in, and instead comment out this bit in 'BaseModelPageRenderer':

    public BaseModelPageRenderer(
            ILogger<BaseModelPageRenderer> logger,
            IUmbracoContextAccessor umbracoContextAccessor,
            IVariationContextAccessor variationContextAccessor,
            IHttpContextAccessor httpContextAccessor
            //SiteHelperService siteHelperService)
        {...}

    Then the site will load just fine.

    Since loading the SiteHelperService via the Startup file works fine, I just don't understand why it causes an issue when loaded into the other service.

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  • Anders Bjerner 487 posts 2996 karma points MVP 8x admin c-trib
    Jul 08, 2023 @ 17:31
    Anders Bjerner
    0

    Hi Heather

    Generally this should be a problem. I tried setting up similar services, and have no problem booting up Umbraco.

    Couldn't it be something that you're doing in one of the constructors?

    Copy Link
  • Heather Floyd 610 posts 1033 karma points MVP 6x c-trib
    Jul 14, 2023 @ 20:03
    Heather Floyd
    0

    Hi Anders!

    My constructors are pretty straightforward - basically storing those injected services to local fields...

    What I did notice, is that if I remove the interface IPageRenderer from BaseModelPageRenderer, the startup error doesn't occur.

    ex:

    public class BaseModelPageRenderer : IPageRenderer

    to:

    public class BaseModelPageRenderer

    so it seems to be something having to do with the IPageRenderer...

    This is all used in conjunction with a Full Text Search Indexer, and the new class is supposed to provide custom page rendering for the indexer to use, rather than an HTTP request. I will likely need to dig into that codebase and figure out where/when that is getting loaded, and perhaps causing the missing Context issue.

    Thanks for testing and replying!

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