feat(anvil): add `eth_call` block overrides (like geth)

[cruzdanilo]

Component

Anvil

Describe the feature you would like

add support for block context overrides in eth_call.

this would allow specifying parameters like block.timestamp, block.number, etc., for an eth_call's execution context, not just state overrides.

Additional context

geth implemented this in its v1.12.0 release (may 25, 2023), via an optional fourth argument to eth_call. (see "add block overrides to eth_call (#26414)" in the geth v1.12.0 release notes).

geth eth_call documentation: https://geth.ethereum.org/docs/interacting-with-geth/rpc/ns-eth#eth-call

[mablr]

Could I try working on this feature?

[mattsse]

yes please
the way this should be impl is adding another optional field for BlockOverrides here:

foundry/crates/anvil/core/src/eth/mod.rs

Line 153 in 9e5f4b9

#[serde(default)] Option<StateOverride>,

and then change this field

foundry/crates/anvil/src/eth/backend/mem/mod.rs

Line 1362 in 9e5f4b9

overrides: Option<StateOverride>,

to EvmOverrides:

https://github.com/alloy-rs/alloy/blob/833f9a22ca7c30079d64554d435561877c15267a/crates/rpc-types-eth/src/state.rs#L262-L262

which has both state and block overrides.

for actually applying block overrides, we can copy and modify:

https://github.com/paradigmxyz/reth/blob/a3c067c2b23353b0f5e78ceff1fb2ea35d32c1db/crates/rpc/rpc-eth-types/src/revm_utils.rs#L218-L261

@mablr updated instructions, ty!

[mablr]

Thank you very much @mattsse for these precise instructions!

Since this issue concerns the eth_call handler, I was wondering if it would be relevant to add BlockOverrides field for the eth_estimateGas handler as well?

[mattsse]

yeah, let's also do that