attestantio/go-eth2-client

Cannot generate SSZ object files

Closed this issue · 3 comments

gsora commented

When running go generate ./... in the spec/deneb directory, sszgen exits with the following error:

[ERR]: failed to encode SignedBeaconBlock: failed to encode BeaconBlock: failed to encode BeaconBlockBody: failed to encode ExecutionPayload: could not find struct with name 'Int'

Have you ever encountered this issue?

Thank you!

pinebit commented

Hi @mcdee this is a blocker for us. Please educate us how to properly run sszgen 🙏

  • 👀1
mcdee commented

sszgen doesn't support all types. uint256.Int is something that is kind-of supported but doesn't generate the correct code, as far as I can tell (and this seems to be supported by ferranbt/fastssz#161).

What I have done in the past to address this is to change the struct to replace the uint256.Int with [8]byte and then generate the SSZ. Then the resultant generated code needs to be tweaked to put the uint256.Int back in. The current executionpayload_ssz.go can be used as a reference.

For a more permanent fix either the marshalling and unmarshalling functions in github.com/holiman/uint256 need to be altered, or fastssz needs to have its own marshalling and unmarshalling functions for uint256.Int, but I haven't had a chance to look at either solution to date.

  • 👍3
gsora commented

Thank you!