openethereum/ethcore/src/engines/null_engine.rs

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// Copyright 2015-2017 Parity Technologies (UK) Ltd.
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// 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 std::collections::BTreeMap;
use util::Address;
use builtin::Builtin;
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use block::*;
use util::*;
use engines::{Engine, CloseOutcome};
use spec::CommonParams;
use evm::Schedule;
use header::BlockNumber;
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use error::Error;
use state::CleanupMode;
use trace::{Tracer, ExecutiveTracer};
use types::trace_types::trace::{RewardType};
/// An engine which does not provide any consensus mechanism and does not seal blocks.
pub struct NullEngine {
params: CommonParams,
builtins: BTreeMap<Address, Builtin>,
}
impl NullEngine {
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/// Returns new instance of NullEngine with default VM Factory
pub fn new(params: CommonParams, builtins: BTreeMap<Address, Builtin>) -> Self {
NullEngine{
params: params,
builtins: builtins,
}
}
}
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impl Default for NullEngine {
fn default() -> Self {
Self::new(Default::default(), Default::default())
}
}
impl Engine for NullEngine {
fn name(&self) -> &str {
"NullEngine"
}
fn params(&self) -> &CommonParams {
&self.params
}
fn builtins(&self) -> &BTreeMap<Address, Builtin> {
&self.builtins
}
fn schedule(&self, _block_number: BlockNumber) -> Schedule {
Schedule::new_homestead()
}
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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> {
if !self.params.apply_reward {
return Ok(CloseOutcome{trace: None});
}
/// Block reward
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let fields = block.fields_mut();
let mut tracer = ExecutiveTracer::default();
let result_block_reward = U256::from(1000000000);
fields.state.add_balance(
fields.header.author(),
&result_block_reward,
CleanupMode::NoEmpty
)?;
let block_miner = fields.header.author().clone();
tracer.trace_reward(block_miner, result_block_reward, RewardType::Block);
/// Uncle rewards
let result_uncle_reward = U256::from(10000000);
for u in fields.uncles.iter() {
let uncle_miner = u.author().clone();
fields.state.add_balance(
u.author(),
&(result_uncle_reward),
CleanupMode::NoEmpty
)?;
tracer.trace_reward(uncle_miner, result_uncle_reward, RewardType::Uncle);
}
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fields.state.commit()?;
match *fields.tracing_enabled {
true => Ok(CloseOutcome{trace: Some(tracer.traces())}),
false => Ok(CloseOutcome{trace: None})
}
}
}