lotus evm deploy: output the messageCid

[wjmelements]

Checklist

• This is not brainstorming ideas. If you have an idea you'd like to discuss, please open a new discussion on the lotus forum and select the category as Ideas.
• I have a specific, actionable, and well motivated feature request to propose.

Lotus component

• lotus daemon - chain sync
• lotus fvm/fevm - Lotus FVM and FEVM interactions
• lotus miner/worker - sealing
• lotus miner - proving(WindowPoSt/WinningPoSt)
• lotus JSON-RPC API
• lotus message management (mpool)
• Other

What is the motivation behind this feature request? Is your feature request related to a problem? Please describe.

I want to measure GasUsed for contract deployment. The best ways I know how to get this are wait-msg and search-msg, which both take a messageCid parameter. I am using lotus evm deploy to deploy FEVM smart contracts, but this doesn't provide the messageCid.

Describe the solution you'd like

lotus evm deploy should report the messageCid.

Describe alternatives you've considered

Alternatively, more information could be provided in the final result reported at the end of lotus evm deploy. This would need to contain all of the information from wait-msg:

• tip set
• exit code
• gas used
• return value

I don't propose this approach because I would prefer for evm deploy to behave more like send.

Additional context

No response

[aceppaluni]

Hi, Can I take this on?

[rvagg]

Go for it @aceppaluni, this one should be fairly straightforward. What you need is here:

lotus/cli/evm.go

Lines 272 to 297 in 9400872

	wait, err := api.StateWaitMsg(ctx, smsg.Cid(), 0)
	if err != nil {
	return xerrors.Errorf("error waiting for message: %w", err)
	}
	// check it executed successfully
	if wait.Receipt.ExitCode != 0 {
	return xerrors.Errorf("actor execution failed")
	}
	var result eam.CreateReturn
	r := bytes.NewReader(wait.Receipt.Return)
	if err := result.UnmarshalCBOR(r); err != nil {
	return xerrors.Errorf("error unmarshaling return value: %w", err)
	}
	addr, err := address.NewIDAddress(result.ActorID)
	if err != nil {
	return err
	}
	afmt.Printf("Actor ID: %d\n", result.ActorID)
	afmt.Printf("ID Address: %s\n", addr)
	afmt.Printf("Robust Address: %s\n", result.RobustAddress)
	afmt.Printf("Eth Address: %s\n", "0x"+hex.EncodeToString(result.EthAddress[:]))
	ea, err := ethtypes.CastEthAddress(result.EthAddress[:])

wait is a MsgLookup that has what you need, including what's in the receipt.