error: failed to run custom build command for `graph-chain-substreams v0.28.2 (graph-node/chain/substreams)

[harshchhatbar34]

I am trying to run a cargo Build and facing this issue

error: failed to run custom build command for graph-chain-substreams v0.28.2 (/home/harsh/zeeve/GRAPH/graph-node/chain/substreams)

Caused by:
process didn't exit successfully: /home/harsh/zeeve/GRAPH/graph-node/target/debug/build/graph-chain-substreams-025de39176fcb4a4/build-script-build (exit status: 101)
--- stdout
cargo:rerun-if-changed=proto

--- stderr
thread 'main' panicked at 'Failed to compile Substreams entity proto(s): Custom { kind: Other, error: "protoc failed: codec.proto:44:12: Explicit 'optional' labels are disallowed in the Proto3 syntax. To define 'optional' fields in Proto3, simply remove the 'optional' label, as fields are 'optional' by default.\ncodec.proto:45:12: Explicit 'optional' labels are disallowed in the Proto3 syntax. To define 'optional' fields in Proto3, simply remove the 'optional' label, as fields are 'optional' by default.\n" }', chain/substreams/build.rs:6:10
note: run with RUST_BACKTRACE=1 environment variable to display a backtrace
warning: build failed, waiting for other jobs to finish...

[johnmesh]

I'm having the same issue
cargo --version
cargo 1.65.0 (4bc8f24d3 2022-10-20)
rustc --version
rustc 1.65.0 (897e37553 2022-11-02)

[johnmesh]

adding protoc_arg("--experimental_allow_proto3_optional") in the chain/substreams/build.rs file worked for me

fn main() {
    println!("cargo:rerun-if-changed=proto");
    tonic_build::configure()
        .out_dir("src/protobuf")
        .protoc_arg("--experimental_allow_proto3_optional")
        .compile(&["codec.proto"], &["proto"])
        .expect("Failed to compile Substreams entity proto(s)");
}

[ancjf]

adding protoc_arg("--experimental_allow_proto3_optional") in the chain/substreams/build.rs

The issue remains.

branch v0.29.0-rc.0
cargo 1.65.0 (4bc8f24d3 2022-10-20)
rustc 1.65.0 (897e37553 2022-11-02)

error: failed to run custom build command for graph-chain-substreams v0.29.0 (/mnt/c/src/rust/graph-node/chain/substreams)

Caused by:
process didn't exit successfully: /mnt/c/src/rust/graph-node/target/debug/build/graph-chain-substreams-0afc3a65ad2b8adf/build-script-build (exit status: 101)
--- stdout
cargo:rerun-if-changed=proto

--- stderr
thread 'main' panicked at 'Failed to compile Substreams entity proto(s): Custom { kind: Other, error: "protoc failed: Unknown flag: --experimental_allow_proto3_optional\n" }', chain/substreams/build.rs:7:10
note: run with RUST_BACKTRACE=1 environment variable to display a backtrace

[maoueh]

Seems a recent enough protoc is required.

A more "permanent" fix that we discussed but not implemented yet will be to remove automatic Protobuf codegen and turn that into a manual command.

This means no need to have protoc and all other tooling just to build the binary.

[maoueh]

@ancjf For now, update your protoc to a more recent version.

[github-actions]

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