openethereum/ethash/src/lib.rs

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2016-01-17 12:00:34 +01:00
//! Ethash implementation
//! See https://github.com/ethereum/wiki/wiki/Ethash
extern crate tiny_keccak;
mod sizes;
mod compute;
use compute::Light;
pub use compute::{quick_get_difficulty, H256, ProofOfWork, ETHASH_EPOCH_LENGTH};
use std::collections::HashMap;
use std::sync::RwLock;
/// Lighy/Full cache manager
pub struct EthashManager {
lights: RwLock<HashMap<u64, Light>>,
}
impl EthashManager {
/// Create a new new instance of ethash manager
pub fn new() -> EthashManager {
EthashManager {
lights: RwLock::new(HashMap::new())
}
}
/// Calculate the light client data
/// `block_number` - Block number to check
/// `light` - The light client handler
/// `header_hash` - The header hash to pack into the mix
/// `nonce` - The nonce to pack into the mix
pub fn compute_light(&self, block_number: u64, header_hash: &H256, nonce: u64) -> ProofOfWork {
let epoch = block_number / ETHASH_EPOCH_LENGTH;
if !self.lights.read().unwrap().contains_key(&epoch) {
let mut lights = self.lights.write().unwrap(); // obtain write lock
if !lights.contains_key(&epoch) {
let light = Light::new(block_number);
lights.insert(epoch, light);
}
}
self.lights.read().unwrap().get(&epoch).unwrap().compute(header_hash, nonce)
}
}