darwinia-shadow 0.0.1

The shadow service for relayers and verify workers to retrieve header data and generate proof. Shadow will index the data it needs from blockchain nodes, such as Ethereum and Darwinia.
Documentation 
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use std::{env, process::Command};

fn main() {
    // pre-check
    println!("cargo:rerun-if-changed=build.rs");
    println!("cargo:rerun-if-changed=path/to/Cargo.lock");

    // main
    let os = Command::new("uname").output().unwrap();
    let ext = match String::from_utf8_lossy(os.stdout.as_slice())
        .into_owned()
        .trim_end()
        .as_ref()
    {
        "Darwin" => "dylib",
        _ => "so",
    };

    let out_dir = env::var_os("OUT_DIR")
        .unwrap()
        .to_string_lossy()
        .to_string();
    let lib = format!("{}/libeth.{}", out_dir, ext);
    Command::new("go")
        .args(&[
            "build",
            "-o",
            &lib,
            "-buildmode=c-shared",
            "pkg/shadow/ffi/mod.go",
        ])
        .status()
        .unwrap();

    // post-check
    println!("cargo:rustc-link-lib=eth");
    println!("cargo:rustc-link-search={}", out_dir);
}