Access list API

[m-Peter]

Relevant info:

• https://www.infura.io/blog/post/optimizing-ethereum-transactions-with-eth_createaccesslist
• https://docs.infura.io/api/networks/ethereum/json-rpc-methods/eth_createaccesslist

[m-Peter]

After going through the relevant source code on Geth (https://github.com/ethereum/go-ethereum/blob/master/internal/ethapi/api.go#L1545-L1549), we will need to expose this method through the EVM contract.

Context:

// Apply the transaction with the access list tracer
tracer := logger.NewAccessListTracer(accessList, args.from(), to, precompiles)
config := vm.Config{Tracer: tracer.Hooks(), NoBaseFee: true}
vmenv := b.GetEVM(ctx, msg, statedb, header, &config, nil)
res, err := core.ApplyMessage(vmenv, msg, new(core.GasPool).AddGas(msg.GasLimit))

The EVM Gateway does not have access to the Geth VM, so I think this is something that should be exposed as a Cadence function from the EVM contract. In turn, the EVM Gateway should call this new Cadence function, through a Cadence transaction.

[sideninja]

The implementation of this optimization feature should be done in the next phase.

[sideninja]

@m-Peter after we build local state will this be doable?

[m-Peter]

@sideninja Good question, I need to do some exploration on this, and see what needs to be done in order to support this.

[m-Peter]

@sideninja After checking this again, it seems that having a StateDB in EVM Gateway won't be enough to support the eth_createAccessList endpoint. We still need an instance of *gethVM.EVM, to be able to apply the message from the given transaction arguments.