how to get the current block author?

Question

I am creating a new pallet, i have a simple task, get the current block author, i want to check whether I am the current one that is proposing the block or not by comparing the current block author with my id.

Unfortunately i have been looking and asking everywhere but there is no clear straightforward way of doing it in aura. it would be great if someone show me a step by step guide on how to solve this and how to properly think about solving such problems.

Answer 1

You can do so by implementing the pallet_authorship::EventHandler. pallet-collator-selection does exactly this, which is a pretty straightforward example.

Then, in the top level runtime, any pallet who's interested in receiving these events about block authorship has to be passed to the authorship pallet:

// in your pallet
impl<T: Config> pallet_authorship::EventHandler for Pallet<T> {..}

// in `runtime/lib.rs`
impl pallet_authorship::Config {
  type EventHandler: (PalletA, PalletB, ...)
  ..
}

Example.