Support state overrides in eth_call

[BlinkyStitt]

Geth has support for "state overrides" that make eth_call even more powerful than it already is.

Geth's docs go into detail: https://geth.ethereum.org/docs/rpc/ns-eth#3-object---state-override-set.

Ganache is likely to merge their PR before the next version: trufflesuite/ganache#2565

A similar change in hardhat would bring it to feature parity.

Brownie already supports state overrides, and I am working on a PR that uses them so that multicall is available on any block on any chain without needing to deploy anything.

[github-actions]

This issue is also being tracked on Linear.

We use Linear to manage our development process, but we keep the conversations on Github.

LINEAR-ID: a56be32e-3dd4-453e-b177-afdf5fc6bd7b

[BlinkyStitt]

As-is, if you try to set the override argument in eth_call, the error is: ValueError: {'code': -32602, 'message': 'Expected between 1 and 2 arguments and got 3'}

[github-actions]

This issue was marked as stale because it didn't have any activity in the last 30 days. If you think it's still relevant, please leave a comment indicating so. Otherwise, it will be closed in 7 days.

[fvictorio]

Still relevant, although we probably won't be able to work on this at least for some months.

[drortirosh]

Any chance state overrides in eth_call is implemented in the near future?
It is already available in ganache, foundry/anvil, and of course on production nodes (geth, erigon, bor, etc)

[fvictorio]

We'll be working on this soon.

To do:

• Add support for state overrides in eth_call. The implementation shouldn't be too hard: we should accept this parameter and then, before making the call, iterate over it and use the state manager to update those fields.
• Add tests for this. This will probably take more effort than the implementation itself. It will likely mean adding some example contracts specific for these tests. I can help with this since it's not straightforward.