feat(`anvil`): add RPC method similar to the ERC20 `deal` cheatcode

[anajuliabit]

Component

Anvil

Describe the feature you would like

I'd like to request the creation of an RPC method similar to the ERC20 deal cheatcode for the following use case:

I need to gather enough votes in a governor to approve a proposal. If a deal equivalent RPC method exists, I could simply deal the quorum amount to any wallet, rather than having to impersonate multiple whale wallets to meet the quorum.

Thank you!

Additional context

No response

[mattsse]

I think this is a reasonable feature

[roninjin10]

+1 on this but would prefer it not be called deal

[Rubilmax]

This would be very helpful to use anvil as a backend for tests where you need to handle ERC20 tokens

[Rubilmax]

@roninjin10 had the idea to request an access list for a call to erc20.balanceOf(account) which would return the storage slot most probably as the last element of the access list returned

That should speed things up right?

[maxslimb]

can I work on this, please?

[yash-atreya]

Assigned @maxslimb

[Rubilmax]

@roninjin10 had the idea to request an access list for a call to erc20.balanceOf(account) which would return the storage slot most probably as the last element of the access list returned

That should speed things up right?

For reference, I implemented this using viem in TypeScript here

Results are much much faster, which avoid having to rely on some external cache because only a few RPC queries are made and no brute-force is required anymore

Also, it adds support for non-trivial tokens such as stETH and USD0. I highly recommend doing something similar at anvil's level: request the access list and try each slot of the access list instead of brute-forcing the balanceOf slot

[maxslimb]

@yash-atreya do you have any guidelines to contribute and for creating a pr?

[grandizzy]

@maxslimb pls see https://github.com/foundry-rs/foundry/blob/master/CONTRIBUTING.md thanks!