144 lines
4.2 KiB
Rust
144 lines
4.2 KiB
Rust
// Copyright 2015-2019 Parity Technologies (UK) Ltd.
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// This file is part of Parity Ethereum.
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// Parity Ethereum is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity Ethereum is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity Ethereum. If not, see <http://www.gnu.org/licenses/>.
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use block::ExecutedBlock;
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use engines::{
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block_reward::{self, RewardKind},
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Engine,
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};
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use ethereum_types::U256;
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use machine::Machine;
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use types::{
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ancestry_action::AncestryAction,
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header::{ExtendedHeader, Header},
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BlockNumber,
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};
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/// Params for a null engine.
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#[derive(Clone, Default)]
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pub struct NullEngineParams {
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/// base reward for a block.
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pub block_reward: U256,
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/// Immediate finalization.
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pub immediate_finalization: bool,
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}
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impl From<::ethjson::spec::NullEngineParams> for NullEngineParams {
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fn from(p: ::ethjson::spec::NullEngineParams) -> Self {
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NullEngineParams {
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block_reward: p.block_reward.map_or_else(Default::default, Into::into),
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immediate_finalization: p.immediate_finalization.unwrap_or(false),
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}
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}
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}
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/// An engine which does not provide any consensus mechanism and does not seal blocks.
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pub struct NullEngine<M> {
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params: NullEngineParams,
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machine: M,
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}
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impl<M> NullEngine<M> {
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/// Returns new instance of NullEngine with default VM Factory
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pub fn new(params: NullEngineParams, machine: M) -> Self {
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NullEngine {
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params: params,
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machine: machine,
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}
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}
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}
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impl<M: Default> Default for NullEngine<M> {
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fn default() -> Self {
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Self::new(Default::default(), Default::default())
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}
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}
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impl<M: Machine> Engine<M> for NullEngine<M> {
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fn name(&self) -> &str {
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"NullEngine"
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}
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fn machine(&self) -> &M {
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&self.machine
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}
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fn on_close_block(&self, block: &mut ExecutedBlock) -> Result<(), M::Error> {
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use std::ops::Shr;
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let author = *block.header.author();
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let number = block.header.number();
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let reward = self.params.block_reward;
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if reward == U256::zero() {
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return Ok(());
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}
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let n_uncles = block.uncles.len();
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let mut rewards = Vec::new();
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// Bestow block reward
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let result_block_reward = reward + reward.shr(5) * U256::from(n_uncles);
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rewards.push((author, RewardKind::Author, result_block_reward));
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// bestow uncle rewards.
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for u in &block.uncles {
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let uncle_author = u.author();
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let result_uncle_reward = (reward * U256::from(8 + u.number() - number)).shr(3);
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rewards.push((
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*uncle_author,
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RewardKind::uncle(number, u.number()),
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result_uncle_reward,
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));
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}
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block_reward::apply_block_rewards(&rewards, block, &self.machine)
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}
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fn maximum_uncle_count(&self, _block: BlockNumber) -> usize {
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2
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}
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fn verify_local_seal(&self, _header: &Header) -> Result<(), M::Error> {
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Ok(())
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}
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fn snapshot_components(&self) -> Option<Box<dyn crate::snapshot::SnapshotComponents>> {
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Some(Box::new(::snapshot::PowSnapshot::new(10000, 10000)))
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}
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fn fork_choice(&self, new: &ExtendedHeader, current: &ExtendedHeader) -> super::ForkChoice {
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super::total_difficulty_fork_choice(new, current)
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}
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fn ancestry_actions(
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&self,
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_header: &Header,
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ancestry: &mut dyn Iterator<Item = ExtendedHeader>,
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) -> Vec<AncestryAction> {
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if self.params.immediate_finalization {
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// always mark parent finalized
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ancestry
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.take(1)
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.map(|e| AncestryAction::MarkFinalized(e.header.hash()))
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.collect()
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} else {
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Vec::new()
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}
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}
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}
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