lib.rs

#[macro_use] extern crate rustler;
#[macro_use] extern crate lazy_static;
extern crate ethash;
extern crate ethcore_util;

use rustler::{NifEnv, NifTerm, NifResult, NifEncoder};
use ethash::{EthashManager};
use ethcore_util::*;

mod atoms {
    rustler_atoms! {
        atom ok;
    }
}

rustler_export_nifs! {
    "Elixir.Ethash",
    [
        ("compute_light", 3, compute_light),
    ],
    None
}

static mut ethash: EthashManager = EthashManager::new();

fn compute_light<'a>(env: NifEnv<'a>, args: &[NifTerm<'a>]) -> NifResult<NifTerm<'a>> {
    let block_number: u64 = try!(args[0].decode());
    let header_hex: String = try!(args[1].decode());
    let nonce: u64 = try!(args[2].decode());

    let header_hash: H256 = H256::from_str(&header_hex).unwrap();

    unsafe {
        let result = ethash.compute_light(block_number, &header_hash.0, nonce);
        Ok((atoms::ok(), H256(result.value).hex(), H256(result.mix_hash).hex()).encode(env))
    };
}