99 lines
2.6 KiB
Rust
99 lines
2.6 KiB
Rust
// Copyright 2015-2017 Parity Technologies (UK) Ltd.
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// This file is part of Parity.
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// Parity 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 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. If not, see <http://www.gnu.org/licenses/>.
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use std::collections::BTreeMap;
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use util::Address;
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use builtin::Builtin;
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use block::*;
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use util::*;
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use engines::{Engine, CloseOutcome};
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use spec::CommonParams;
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use evm::Schedule;
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use header::BlockNumber;
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use error::Error;
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use state::CleanupMode;
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use trace::{Tracer, ExecutiveTracer};
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use types::trace_types::trace::{RewardType};
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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 {
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params: CommonParams,
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builtins: BTreeMap<Address, Builtin>,
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}
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impl NullEngine {
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/// Returns new instance of NullEngine with default VM Factory
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pub fn new(params: CommonParams, builtins: BTreeMap<Address, Builtin>) -> Self {
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NullEngine{
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params: params,
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builtins: builtins,
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}
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}
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}
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impl Default for NullEngine {
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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 Engine for NullEngine {
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fn name(&self) -> &str {
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"NullEngine"
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}
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fn params(&self) -> &CommonParams {
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&self.params
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}
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fn builtins(&self) -> &BTreeMap<Address, Builtin> {
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&self.builtins
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}
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fn schedule(&self, _block_number: BlockNumber) -> Schedule {
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Schedule::new_homestead()
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}
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fn snapshot_components(&self) -> Option<Box<::snapshot::SnapshotComponents>> {
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Some(Box::new(::snapshot::PowSnapshot(10000)))
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}
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fn on_close_block(&self, block: &mut ExecutedBlock) -> Result<CloseOutcome, Error> {
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if !self.params.apply_reward {
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return Ok(CloseOutcome{trace: None});
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}
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let fields = block.fields_mut();
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let mut tracer = ExecutiveTracer::default();
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let result_block_reward = U256::from(1000000000);
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fields.state.add_balance(
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fields.header.author(),
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&result_block_reward,
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CleanupMode::NoEmpty
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)?;
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let block_miner = fields.header.author().clone();
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tracer.trace_reward(block_miner, result_block_reward, RewardType::Block);
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fields.state.commit()?;
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match *fields.tracing_enabled {
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true => Ok(CloseOutcome{trace: Some(tracer.traces())}),
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false => Ok(CloseOutcome{trace: None})
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}
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}
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}
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