Skip function invocation and return value with custom function filter

Question

I am wanting to share some logic between multiple functions which now seems to be partially achievable by using Function Filters within azure functions however in certain cases I don't want to continue execution of the function and be able to return a result back to the binding provider (same as returning a result from the function it's self).

Taking a look at the code the only way to short circuit the calling of the inner IFunctionInvoker within FunctionInvocationFilterInvoker is to throw an exception inside the custom invocation filter. The only problem with this approach is that the exception will bubble up to the host and cause a failure/retries etc.. somewhere else.

Also taking this approach doesn't allow me to set another return value back binding provider. I did see that we could wrap this in our own IFunctionInvoker but I was wondering if there was a better way to achieve this?

Code executing filters

Answer 1

Not possible yet, but this is something we'll definitely enable. We're tracking this capability in our repo here.