openethereum/crates/concensus/miner/src/external.rs

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// Copyright 2015-2020 Parity Technologies (UK) Ltd.
// This file is part of OpenEthereum.
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// OpenEthereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
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// OpenEthereum is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
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// along with OpenEthereum. If not, see <http://www.gnu.org/licenses/>.
//! External Miner hashrate tracker.
use ethereum_types::{H256, U256};
use parking_lot::Mutex;
use std::{
collections::HashMap,
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sync::Arc,
time::{Duration, Instant},
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};
/// External miner interface.
pub trait ExternalMinerService: Send + Sync {
/// Submit hashrate for given miner.
fn submit_hashrate(&self, hashrate: U256, id: H256);
/// Total hashrate.
fn hashrate(&self) -> U256;
}
/// External Miner.
pub struct ExternalMiner {
hashrates: Arc<Mutex<HashMap<H256, (Instant, U256)>>>,
}
impl Default for ExternalMiner {
fn default() -> Self {
ExternalMiner {
hashrates: Arc::new(Mutex::new(HashMap::new())),
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}
}
}
impl ExternalMiner {
/// Creates new external miner with prefilled hashrates.
pub fn new(hashrates: Arc<Mutex<HashMap<H256, (Instant, U256)>>>) -> Self {
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ExternalMiner {
hashrates: hashrates,
}
}
}
const ENTRY_TIMEOUT: Duration = Duration::from_secs(2);
impl ExternalMinerService for ExternalMiner {
fn submit_hashrate(&self, hashrate: U256, id: H256) {
self.hashrates
.lock()
.insert(id, (Instant::now() + ENTRY_TIMEOUT, hashrate));
}
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fn hashrate(&self) -> U256 {
let mut hashrates = self.hashrates.lock();
let h = hashrates
.drain()
.filter(|&(_, (t, _))| t > Instant::now())
.collect();
*hashrates = h;
hashrates
.iter()
.fold(U256::from(0), |sum, (_, &(_, v))| sum + v)
}
}
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#[cfg(test)]
mod tests {
use super::*;
use ethereum_types::{H256, U256};
use std::{thread::sleep, time::Duration};
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fn miner() -> ExternalMiner {
ExternalMiner::default()
}
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#[test]
fn it_should_forget_old_hashrates() {
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// given
let m = miner();
assert_eq!(m.hashrate(), U256::from(0));
m.submit_hashrate(U256::from(10), H256::from_low_u64_be(1));
assert_eq!(m.hashrate(), U256::from(10));
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// when
sleep(Duration::from_secs(3));
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// then
assert_eq!(m.hashrate(), U256::from(0));
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}
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#[test]
fn should_sum_up_hashrate() {
// given
let m = miner();
assert_eq!(m.hashrate(), U256::from(0));
m.submit_hashrate(U256::from(10), H256::from_low_u64_be(1));
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assert_eq!(m.hashrate(), U256::from(10));
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// when
m.submit_hashrate(U256::from(15), H256::from_low_u64_be(1));
m.submit_hashrate(U256::from(20), H256::from_low_u64_be(2));
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// then
assert_eq!(m.hashrate(), U256::from(35));
}
}