Add support for debug_traceCall to EVM GW API

[franklywatson]

This endpoint is required for ERC-4337 integration

https://geth.ethereum.org/docs/interacting-with-geth/rpc/ns-debug#debugtracecall

[SeanRobb]

@franklywatson @sideninja

Can we get it estimated and prioritized as it is blocking Alchemy ERC-4337 bundler. Which then is blocking 2 integration P1 partners for us?

[sideninja]

@SeanRobb what is the expected tracer configuration they will want to use? the same one as we currently support for trace transaction?

[SeanRobb]

@franklywatson @AnukeG do we have an answer for @sideninja question?

[dancoombs]

By tracer config are you referring to the Geth TraceConfig?

If so, we currently use tracer with a javascript tracer, and timeout.

Our usage is here (Rust): https://github.com/alchemyplatform/rundler/blob/7b5097f537b25b504951584df6f3bc18fdb29d68/crates/sim/src/simulation/v0_7/tracer.rs#L155

[franklywatson]

FYI this needs to include state_overrides to meet ERC-4337 integration requirements

[m-Peter]

FYI this needs to include state_overrides to meet ERC-4337 integration requirements

@franklywatson Can we have a sample JSON-RPC request with this, so we can try it out during development?

[franklywatson]

Partner responded with:

In general, the requirement is an API the same as Geth: https://geth.ethereum.org/docs/interacting-with-geth/rpc/ns-debug#debugtracecall
We specifically use a Javascript expression in the tracer field here. https://geth.ethereum.org/docs/interacting-with-geth/rpc/ns-debug#traceconfig

Attached is a request/response payload example from another chain, however, bear in mind it won't run on Flow given it's for another network
debug_traceCall with overrides example.txt

[m-Peter]

Thanks @franklywatson , I have made some working examples of JavaScript tracer with state overrides.

[dancoombs]

FYI this needs to include state_overrides to meet ERC-4337 integration requirements

Just to make sure this isn't forgotten, ERC-4337 also requires eth_call to support the same Geth ethapi.StateOverride in the API. Not sure if that is tracked in another ticket but the the application of the state overrides can be shared between the two APIs (debug_traceCall/eth_call)

[m-Peter]

FYI this needs to include state_overrides to meet ERC-4337 integration requirements

Just to make sure this isn't forgotten, ERC-4337 also requires eth_call to support the same Geth ethapi.StateOverride in the API. Not sure if that is tracked in another ticket but the the application of the state overrides can be shared between the two APIs (debug_traceCall/eth_call)

That's a good call out 👍 Currently eth_call does not support the ethapi.StateOverride, but I'll open up a new issue for it.