Is there an ETA for Configure method with ILambdaInvokeBuilder?

[Nairda015]

Describe the feature

Hey I want to create middleware or filter pipeline for lambda function
There is note about middleware in design doc but no information when it will happen

There are old PR without CR like this and idk if I should contribute

Use Case

global error handling, extracting standard headers like trace-id

Proposed Solution

I have workaround with more generated code and castle.core for intercepting calls
For class FunctionHandler I can generate IFunctionHandler and FunctionHandlerWrapper.
Next I can call FunctionHandler from FunctionHandlerWrapper.
Also need to register FunctionHandler as TryAddSingleton<IFunctionHandler, FunctionHandler> so it is interceptable.

Maybe before full middleware pipeline implementation can we add option to generate IFunctionHandler by the annotation framework and resolve it from DI by interface in generated code?

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

AWS .NET SDK and/or Package version used

Amazon.Lambda.Annotations --version 1.2.0

Targeted .NET Platform

.NET 6

Operating System and version

AmazonLinux

[ashishdhingra]

@Nairda015 Good afternoon. Thanks for opening the issue. Please refer similar discussion started on #1688 (comment). Similar discussion #1683. Annotations doesn't leverage ASP.NET pipeline. I'm unsure if your use case is similar, could you please validate?

Thanks,
Ashish

[Nairda015]

I mean something like this
I don't need ASP pipeline like in #1688 I need a way to intercept handler calls so I can put common logic before

[ashishdhingra]

I mean something like this
I don't need ASP pipeline like in #1688 I need a way to intercept handler calls so I can put common logic before

The design document just compares the existing old approach Vs. annotations. Configure method is typically used in context with ASP.NET applications.

Needs review with the team. CC @normj

[normj]

I don't have a timeline but it is a feature I would like to get in there.

[Nairda015]

Do you have a vision of how you would implement it or my idea about resolving the handler from DI with the interface and adding interceptors from Castle.Core is good enough?

[Nairda015]

@normj will you accept PR with change to register handler with interface here?
So instead of
services.AddSingleton<<#= _model.LambdaMethod.ContainingType.Name #>>();
services.AddSingleton<I<#= _model.LambdaMethod.ContainingType.Name #>, <#= _model.LambdaMethod.ContainingType.Name #>>(); or sth like that
maybe this should be configurable from attribute idk but this will provide easy way to intercept this call