[elasticloadbalancingv2] add `addAction()` to `IApplicationListener` and imported application listeners.

I’d like for the IApplicationListener interface and imported listeners to include addAction() the same as ApplicationListener.

Use Case

I’d like to add a redirect listener rule to an imported ALB listener.

Proposed Solution

Why can’t we add this method to the IApplicationListener interface and then add the missing implementation to ImportedApplicationListener?

Other

I can work around this issue by manually creating ApplicationListenerRules and an ApplicationTargetGroup, but this approach is not as convenient as listener.addTarget('name', {...}).

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

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This is a 🚀 Feature Request

[gburke-ppb]

I too am looking for this.

We have an ALB that we use for multiple applications. For the most part using elbv2.ApplicationListener.fromApplicationListenerAttributes() to return an IApplicationListener and calling addTargetGroups() on this works – this is fine for just adding a host header and a forward to a TargetGroup. (although adding the priority is a bit of a headache… but that’s not for this issue).

However we are trying to add authentication with Cognito before forwarding to the TargetGroup, and this would be done using addAction() – this isn’t available on the returned object!

So using an existing ALB, how can we add this action?

Also the documentation for ApplicationListener itself mentions using addAction() over the other methods.

So can you please expose addAction() through the IApplicationListener interface? The only Class implementing this interface is ApplicationListener itself, so it should be an easy thing to add, I would hope.

We are currently blocked on a piece of work because of this. 😢

[gburke-ppb]

@njlynch I see you closed the new issue, but nobody is assigned to this one and nothing has been done since it was opened 16 months ago. Is this issue still to be fixed? Is there an ETA? Thanks.