feat(anvil): use ContextPrecompile instead of Precompile in Anvil's precompile injection API

[alexfertel]

Component

Anvil

Describe the feature you would like

We've been using the new precompile injection API created in #7589, and it's working well.

After some use, the need for ContextPrecompile arose: we needed a way to get the code of an account, and with the params of Precompile, this can't be done. If I understand correctly the implementation in revm, ContextPrecompile does give access to account state through InnerEvmContext::code_hash.

Since ContextPrecompile is a superset of Precompile, this should be fine. I tried making an initial PoC, but the generics of ContextPrecompile<DB: Database> get a bit in the way.

Current workaround is creating a provider inside the precompile and making a get_code_at async call. This works fine, it's just that it's a bit awkward having to make an RPC call, when we are executing in the context of an EVM.

Additional context

No response

[palango]

I'm also facing the same issue, needing to create a precompile that has (write)access to state.

The workaround mentioned above unfortunately doesn't work, as I need low level access to accounts. Is there an obvious way to satisfy the DB constraint without pulling it through the whole codebase?

[pahor167]

Unfortunately this is blocking us from fully onboarding Anvil for Celo. Is there any chance that this feature will be addressed any time soon ? @gakonst

[shazarre]

hey @mattsse @onbjerg @Evalir @DaniPopes any chance this could be implemented any time soon? we're currently migrating our tests to anvil and this is blocking us as well

thanks in advance for looking into it!