protoc failed: bundle.proto: contains proto3 optional fields #57

Question

I am facing an issue when running cargo build in the jito-labs/searcher-examples project. The error message I receive is:

"called Result::unwrap() on an Err value: Custom { kind: Other, error: protoc failed: bundle.proto: This file contains proto3 optional fields, but --experimental_allow_proto3_optional was not set."

It seems to be a problem related to the proto3 optional fields. How can I resolve this issue and set the correct flag?

Thank you for your assistance.

Answer 1

It looks like you got your answer on their GitHub at https://github.com/jito-labs/searcher-examples/issues/57:

try to follow compiler hint.

in jito_protos/build.rs

use tonic_build::configure;

fn main() {
    configure()
        .protoc_arg("--experimental_allow_proto3_optional")
        .compile(
            &[
                "protos/auth.proto",
                "protos/block.proto",
                "protos/block_engine.proto",
                "protos/bundle.proto",
                "protos/packet.proto",
                "protos/relayer.proto",
                "protos/searcher.proto",
                "protos/shared.proto",
            ],
            &["protos"],
        )
        .unwrap();
}