.NET7.0 AOT for clients and services?

[jefflill]

Investigate new .NET7.0 AOT capabilities:

https://learn.microsoft.com/en-us/dotnet/core/deploying/native-aot/

[marcusbooyah]

[System.TypeInitializationException]: A type initializer threw an exception. To determine which type, inspect the InnerException's StackTrace property. [inner:System.TypeInitializationException: A type initializer threw an exception. To determine which typ2022-09-26T23:23:36.585336762Z e, inspect the InnerException's StackTrace property.]: stacktrace:    at System.Runtime.CompilerServices.ClassConstructorRunner.EnsureClassConstructorRun(StaticClassConstructionContext*) + 0x153
   at System.Runtime.CompilerServices.ClassConstructorRunner.2022-09-26T23:23:36.585420363Z CheckStaticClassConstructionReturnNonGCStaticBase(StaticClassConstructionContext*, IntPtr) + 0x9
   at OpenTelemetry.Logs.OpenTelemetryLoggerProvider..ctor(IOptionsMonitor`1 options) + 0x14
   at bowyer-photo!<BaseAddress>+0x4974f6f
   at System.Reflection2022-09-26T23:23:36.585669214Z .DynamicInvokeInfo.Invoke(Object, IntPtr, Object[], BinderBundle, Boolean) + 0x173
   at Internal.Reflection.Execution.MethodInvokers.InstanceMethodInvoker.Invoke(Object, Object[], BinderBundle, Boolean) + 0x4f
   at Internal.Reflection.Core.Execution.Meth2022-09-26T23:23:36.585737171Z odInvoker.Invoke(Object, Object[], Binder, BindingFlags, CultureInfo) + 0x47
   at System.Reflection.Runtime.MethodInfos.RuntimePlainConstructorInfo`1.Invoke(BindingFlags, Binder, Object[], CultureInfo) + 0x96
   at Microsoft.Extensions.DependencyInjection2022-09-26T23:23:36.585823202Z .ServiceLookup.CallSiteRuntimeResolver.VisitRootCache(ServiceCallSite, RuntimeResolverContext) + 0x78
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSite(ServiceCallSite callSite, TArgument argument) + 0xcc
   at Mi2022-09-26T23:23:36.586306804Z crosoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitIEnumerable(IEnumerableCallSite, RuntimeResolverContext) + 0x65
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitRootCache(ServiceCal2022-09-26T23:23:36.586424152Z lSite, RuntimeResolverContext) + 0x78
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSite(ServiceCallSite callSite, TArgument argument) + 0xcc
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRun2022-09-26T23:23:36.586509285Z timeResolver.VisitConstructor(ConstructorCallSite, RuntimeResolverContext) + 0x83
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitRootCache(ServiceCallSite, RuntimeResolverContext) + 0x78
   at Microsoft.Extensions2022-09-26T23:23:36.586636623Z .DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSite(ServiceCallSite callSite, TArgument argument) + 0xcc
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.Resolve(ServiceCallSite, ServiceProviderEngineScope2022-09-26T23:23:36.586703429Z ) + 0x1e
   at Microsoft.Extensions.DependencyInjection.ServiceProvider.CreateServiceAccessor(Type serviceType) + 0xe5
   at System.Collections.Concurrent.ConcurrentDictionary`2.GetOrAdd(TKey key, Func`2 valueFactory) + 0x8d
   at Microsoft.Extensions.Depe2022-09-26T23:23:36.586860436Z ndencyInjection.ServiceProvider.GetService(Type, ServiceProviderEngineScope) + 0x33
   at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService(IServiceProvider provider, Type serviceType) + 0x51
   at Microsoft.Exten2022-09-26T23:23:36.587059753Z sions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService[T](IServiceProvider provider) + 0x2f
   at Microsoft.Extensions.Logging.LoggerFactory.Create(Action`1) + 0x79
   at Neon.Service.NeonService..ctor(String name, String version, Ne2022-09-26T23:23:36.587496233Z onServiceOptions options) + 0x975
[System.TypeInitializationException]: A type initializer threw an exception. To determine which type, inspect the InnerException's StackTrace property. [inner:System.TypeInitializationException: A type initializer threw an exception. To determine which typ2022-09-26T23:23:36.592535147Z e, inspect the InnerException's StackTrace property.]

[marcusbooyah]

open-telemetry/opentelemetry-dotnet#3429

[jefflill]

So AOT will probably wok fine by itself here, just don't do trimming (also because it's too freaking slow) and after a very quick look, it appears that single-file isn't compatible with reflection (I could easily be wrong about this).

I'm not entirely sure that AOT is really that important for the services. On one hand, it'll make app startup a bit faster because we'd avoid JIT, on the other hand, the generated binaries would be roughly twice the size as IL binaries.

I'm going to close this.