109 lines
3.1 KiB
Rust
109 lines
3.1 KiB
Rust
// Copyright 2015-2017 Parity Technologies (UK) Ltd.
|
|
// This file is part of Parity.
|
|
|
|
// Parity 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.
|
|
|
|
// Parity 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
|
|
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
use bigint::prelude::U256;
|
|
use engines::Engine;
|
|
use header::BlockNumber;
|
|
use parity_machine::{Header, LiveBlock, WithBalances};
|
|
|
|
/// Params for a null engine.
|
|
#[derive(Clone, Default)]
|
|
pub struct NullEngineParams {
|
|
/// base reward for a block.
|
|
pub block_reward: U256,
|
|
}
|
|
|
|
impl From<::ethjson::spec::NullEngineParams> for NullEngineParams {
|
|
fn from(p: ::ethjson::spec::NullEngineParams) -> Self {
|
|
NullEngineParams {
|
|
block_reward: p.block_reward.map_or_else(Default::default, Into::into),
|
|
}
|
|
}
|
|
}
|
|
|
|
/// An engine which does not provide any consensus mechanism and does not seal blocks.
|
|
pub struct NullEngine<M> {
|
|
params: NullEngineParams,
|
|
machine: M,
|
|
}
|
|
|
|
impl<M> NullEngine<M> {
|
|
/// Returns new instance of NullEngine with default VM Factory
|
|
pub fn new(params: NullEngineParams, machine: M) -> Self {
|
|
NullEngine {
|
|
params: params,
|
|
machine: machine,
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<M: Default> Default for NullEngine<M> {
|
|
fn default() -> Self {
|
|
Self::new(Default::default(), Default::default())
|
|
}
|
|
}
|
|
|
|
impl<M: WithBalances> Engine<M> for NullEngine<M> {
|
|
fn name(&self) -> &str {
|
|
"NullEngine"
|
|
}
|
|
|
|
fn machine(&self) -> &M { &self.machine }
|
|
|
|
fn on_close_block(&self, block: &mut M::LiveBlock) -> Result<(), M::Error> {
|
|
use std::ops::Shr;
|
|
|
|
let author = *LiveBlock::header(&*block).author();
|
|
let number = LiveBlock::header(&*block).number();
|
|
|
|
let reward = self.params.block_reward;
|
|
if reward == U256::zero() { return Ok(()) }
|
|
|
|
let n_uncles = LiveBlock::uncles(&*block).len();
|
|
|
|
// Bestow block reward
|
|
let result_block_reward = reward + reward.shr(5) * U256::from(n_uncles);
|
|
let mut uncle_rewards = Vec::with_capacity(n_uncles);
|
|
|
|
self.machine.add_balance(block, &author, &result_block_reward)?;
|
|
|
|
// bestow uncle rewards.
|
|
for u in LiveBlock::uncles(&*block) {
|
|
let uncle_author = u.author();
|
|
let result_uncle_reward = (reward * U256::from(8 + u.number() - number)).shr(3);
|
|
|
|
uncle_rewards.push((*uncle_author, result_uncle_reward));
|
|
}
|
|
|
|
for &(ref a, ref reward) in &uncle_rewards {
|
|
self.machine.add_balance(block, a, reward)?;
|
|
}
|
|
|
|
// note and trace.
|
|
self.machine.note_rewards(block, &[(author, result_block_reward)], &uncle_rewards)
|
|
}
|
|
|
|
fn maximum_uncle_count(&self, _block: BlockNumber) -> usize { 2 }
|
|
|
|
fn verify_local_seal(&self, _header: &M::Header) -> Result<(), M::Error> {
|
|
Ok(())
|
|
}
|
|
|
|
fn snapshot_components(&self) -> Option<Box<::snapshot::SnapshotComponents>> {
|
|
Some(Box::new(::snapshot::PowSnapshot::new(10000, 10000)))
|
|
}
|
|
}
|