zerokit/semaphore/build.rs

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// Adapted from semaphore-rs/build.rs
use color_eyre::eyre::{eyre, Result};
use std::{
path::{Component, Path, PathBuf},
process::Command,
};
const ZKEY_FILE: &str = "./vendor/semaphore/build/snark/semaphore_final.zkey";
const WASM_FILE: &str = "./vendor/semaphore/build/snark/semaphore.wasm";
// See <https://internals.rust-lang.org/t/path-to-lexical-absolute/14940>
fn absolute(path: &str) -> Result<PathBuf> {
let path = Path::new(path);
let mut absolute = if path.is_absolute() {
PathBuf::new()
} else {
std::env::current_dir()?
};
for component in path.components() {
match component {
Component::CurDir => {}
Component::ParentDir => {
absolute.pop();
}
component => absolute.push(component.as_os_str()),
}
}
Ok(absolute)
}
fn build_circuit() -> Result<()> {
println!("cargo:rerun-if-changed=./vendor/semaphore");
let run = |cmd: &[&str]| -> Result<()> {
// TODO: Use ExitCode::exit_ok() when stable.
Command::new(cmd[0])
.args(cmd[1..].iter())
.current_dir("./vendor/semaphore")
.status()?
.success()
.then(|| ())
.ok_or(eyre!("procees returned failure"))?;
Ok(())
};
// Compute absolute paths
let zkey_file = absolute(ZKEY_FILE)?;
let wasm_file = absolute(WASM_FILE)?;
// Build circuits if not exists
// TODO: This does not rebuild if the semaphore submodule is changed.
// NOTE: This requires npm / nodejs to be installed.
if !(zkey_file.exists() && wasm_file.exists()) {
run(&["npm", "install"])?;
run(&["npm", "exec", "ts-node", "./scripts/compile-circuits.ts"])?;
}
assert!(zkey_file.exists());
assert!(wasm_file.exists());
// Export generated paths
println!("cargo:rustc-env=BUILD_RS_ZKEY_FILE={}", zkey_file.display());
println!("cargo:rustc-env=BUILD_RS_WASM_FILE={}", wasm_file.display());
Ok(())
}
#[cfg(feature = "dylib")]
fn build_dylib() -> Result<()> {
use enumset::enum_set;
use std::{env, str::FromStr};
use wasmer::{Module, Store, Target, Triple};
use wasmer_compiler_cranelift::Cranelift;
use wasmer_engine_dylib::Dylib;
let wasm_file = absolute(WASM_FILE)?;
assert!(wasm_file.exists());
let out_dir = env::var("OUT_DIR")?;
let out_dir = Path::new(&out_dir).to_path_buf();
let dylib_file = out_dir.join("semaphore.dylib");
println!(
"cargo:rustc-env=CIRCUIT_WASM_DYLIB={}",
dylib_file.display()
);
if dylib_file.exists() {
return Ok(());
}
// Create a WASM engine for the target that can compile
let triple = Triple::from_str(&env::var("TARGET")?).map_err(|e| eyre!(e))?;
let cpu_features = enum_set!();
let target = Target::new(triple, cpu_features);
let compiler_config = Cranelift::default();
let engine = Dylib::new(compiler_config).target(target).engine();
// Compile the WASM module
let store = Store::new(&engine);
let module = Module::from_file(&store, &wasm_file)?;
module.serialize_to_file(&dylib_file)?;
assert!(dylib_file.exists());
println!("cargo:warning=Circuit dylib is in {}", dylib_file.display());
Ok(())
}
fn main() -> Result<()> {
build_circuit()?;
#[cfg(feature = "dylib")]
build_dylib()?;
Ok(())
}