Activities of "kasem"

Not sure I got it but I already have this in appsettings in both production and dev.

"SwaggerUIEnabled": "false"

Swagger isn't accessible in prod.

Do you mean just omit the line bool.Parse(_appConfiguration["App:SwaggerUIEnabled"]) ?

Should the ON/OFF I have in appsettings enable/disable without the If statement I added?

Hi @maliming

It's enabled in dev mode but disabled in production. Not sure if it's the correct way to disable Swagger in production?

I get this error in production

Thanks

Sent to your email.

Hi

I got another type of unhandled exception. This time is about Swagger:

e.Diagnostics.ExceptionHandlerMiddleware - An unhandled exception has occurred while executing the request. System.InvalidOperationException: Unable to resolve service for type 'Swashbuckle.AspNetCore.Swagger.ISwaggerProvider' while attempting to Invoke middleware 'Swashbuckle.AspNetCore.Swagger.SwaggerMiddleware'. at Microsoft.AspNetCore.Builder.UseMiddlewareExtensions.GetService(IServiceProvider sp, Type type, Type middleware) at lambda_method(Closure , Object , HttpContext , IServiceProvider ) at Microsoft.AspNetCore.Routing.EndpointMiddleware.Invoke(HttpContext httpContext) at Microsoft.AspNetCore.Routing.EndpointRoutingMiddleware.Invoke(HttpContext httpContext) at Microsoft.AspNetCore.Builder.Extensions.MapMiddleware.Invoke(HttpContext context) at Microsoft.AspNetCore.Builder.RouterMiddleware.Invoke(HttpContext httpContext) at Microsoft.AspNetCore.Localization.RequestLocalizationMiddleware.Invoke(HttpContext context) at Microsoft.AspNetCore.StaticFiles.StaticFileMiddleware.Invoke(HttpContext context) at IdentityServer4.Hosting.IdentityServerMiddleware.Invoke(HttpContext context, IEndpointRouter router, IUserSession session, IEventService events) at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context) at IdentityServer4.Hosting.BaseUrlMiddleware.Invoke(HttpContext context) at Abp.AspNetZeroCore.Web.Authentication.JwtBearer.JwtTokenMiddleware.<>c__DisplayClass0_0.<<UseJwtTokenMiddleware>b__0>d.MoveNext() --- End of stack trace from previous location where exception was thrown --- at Abp.AspNetZeroCore.Web.Authentication.JwtBearer.JwtTokenMiddleware.<>c__DisplayClass0_0.<<UseJwtTokenMiddleware>b__0>d.MoveNext() --- End of stack trace from previous location where exception was thrown --- at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context) at Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddleware.Invoke(HttpContext context)

I researched logs already and I think I'm able to locate the 1-2 services that produce that exception. I already optimized my queries to avoid executing a query while iterating over the results from another query. Also, I stopped all background workers and jobs. All the mentioned didn't help yet and I still need to find the exact place so I better know how to fix it.

I'm still aiming for two things:

1. Background jobs and workers are handled through Hangfire. I temporarily stopped them but I still need them so I wonder if I can follow your Migrator project to do something similar for an isolated service running my background workers independently. Problem in those workers fails this particular service without affecting the whole application.
2. Gather more details about the unhandled exception. Wonder if I placed your code in the right place Startup(IHostingEnvironment env) ? please let me know how I can fix this

Thanks

Hi!

I got the expected crash again. Unfortunately I got in c:\logs exactly same message I got in windows event viewer. There's nothing that helps me idenfity source of problem!

The weird thing that I get logs only when I restart IIS. System crashed and was stucked for hours without any logs in c:\logs nor in event viewer.

Your urgent assistance is needed please since this problem has been negatively impacting the user experience of my users in production!

Thanks a lot Alper! I added your code to Startup(IHostingEnvironment env) method and deployed to production. I've created Logs folder in c:\ with IUSR permissions. I'm now waiting the next crash to check logs!

Thank you @alper and @ismcagdas

I don't have async void.

Everytime system crashes I get the following two errors in windows event viewer:

Application: MyApp.Web.Host.exe CoreCLR Version: 4.6.27817.3 Description: The process was terminated due to an unhandled exception. Exception Info: System.InvalidOperationException: There is already an open DataReader associated with this Command which must be closed first. at System.Data.SqlClient.SqlInternalConnectionTds.ValidateConnectionForExecute(SqlCommand command) at System.Data.SqlClient.SqlInternalTransaction.Rollback() at System.Data.SqlClient.SqlTransaction.Dispose(Boolean disposing) at Microsoft.EntityFrameworkCore.Storage.RelationalTransaction.Dispose() at Microsoft.EntityFrameworkCore.Storage.RelationalConnection.ClearTransactions() at Microsoft.EntityFrameworkCore.Storage.RelationalConnection.Dispose() at Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngineScope.Dispose() at Microsoft.EntityFrameworkCore.DbContext.Dispose() at Castle.MicroKernel.ComponentActivator.AbstractComponentActivator.ApplyConcerns(IEnumerable`1 steps, Object instance) at Castle.MicroKernel.ComponentActivator.AbstractComponentActivator.Destroy(Object instance) at Castle.MicroKernel.Lifestyle.AbstractLifestyleManager.Release(Object instance) at Castle.MicroKernel.Burden.Release() at Castle.MicroKernel.Releasers.LifecycledComponentsReleasePolicy.Dispose() at Castle.MicroKernel.DefaultKernel.Dispose() at Microsoft.AspNetCore.Hosting.Internal.WebHost.Dispose() at Microsoft.AspNetCore.Hosting.WebHostExtensions.RunAsync(IWebHost host, CancellationToken token, String shutdownMessage) at Microsoft.AspNetCore.Hosting.WebHostExtensions.RunAsync(IWebHost host, CancellationToken token) at Microsoft.AspNetCore.Hosting.WebHostExtensions.Run(IWebHost host) at MyApp.Web.Startup.Program.Main(String[] args) in C:\code\MyApp\aspnet-core\src\MyApp.Web.Host\Startup\Program.cs:line 11

Faulting application name: MyApp.Web.Host.exe, version: 0.0.0.0, time stamp: 0x5c414d46 Faulting module name: KERNELBASE.dll, version: 6.3.9600.19425, time stamp: 0x5d26b6e9 Exception code: 0xe0434352 Fault offset: 0x000000000000908c Faulting process id: 0x17e0 Faulting application start time: 0x01d56396ebf75622

Can you please tell me where exactly in Startup.cs I should add the code posted by @Alper ? Are you referring to Startup.cs in web.host?

Sorry another question. I feel it's hard to find unhandled exception and I really don't want the app in production to crash. I need your help in the following:

1. Is there a way to auto restart service when app crashes as a result of an unhandled exception?
2. How can I debug/find details about unhandled exceptions? Can't you log unhandled exceptions before app crashes so I get more info about the bug in order to fix it? https://docs.microsoft.com/en-us/dotnet/api/system.windows.forms.application.setunhandledexceptionmode?view=netframework-4.8

A possible fix for Open DataReader problem is enabling MARS https://docs.microsoft.com/en-us/sql/relational-databases/native-client/features/using-multiple-active-result-sets-mars?view=sql-server-2017

Do you recommend doing so?