Hands-On Microservices with Rust

Generating interfaces

Rust build scripts let you implement a function that will do some additional preparation for project compilation. In our case, we have the ring.proto file with a protocol definition and we want to convert it to Rust sources using the protoc-rust-grpc crate.

Create the build.rs file in the project and add the following content:

extern crate protoc_rust_grpc;fn main() {    protoc_rust_grpc::run(protoc_rust_grpc::Args {        out_dir: "src",        includes: &[],        input: &["ring.proto"],        rust_protobuf: true,        ..Default::default()    }).expect("protoc-rust-grpc");}

Build scripts use the main function as an entry point, in which you can implement any activities you want. We used the run function of the protoc-rust-grpc crate with Args—we set ...