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Generalize engine trait (#6591)

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* move common forks and parameters to common params

* port specs over to new format

* fix RPC tests

* parity-machine skeleton

* remove block type

* extract out ethereum-specific methods into EthereumMachine

* beginning to integrate Machine into engines. dealing with stale transitions in Ethash

* initial porting to machine

* move block reward back into engine

* abstract block reward logic

* move last hash and DAO HF logic into machine

* begin making engine function parameters generic

* abstract epoch verifier and ethash block reward logic

* instantiate special ethereummachine for ethash in spec

* optional full verification in verify_block_family

* re-instate tx_filter in a way that works for all engines

* fix warnings

* fix most tests, further generalize engine trait

* uncomment nullengine, get ethcore tests compiling

* fix warnings

* update a bunch of specs

* re-enable engine signer, validator set, and transition handler

* migrate basic_authority engine

* move last hashes into executedblock

* port tendermint

* make all ethcore tests pass

* json-tests compilation

* fix RPC tests: change in gas limit for new block changed PoW hash

* fix minor grumbles

* validate chainspecs

* fix broken import

* fix transaction verification for pre-homestead
This commit is contained in:
Robert Habermeier
2017-09-26 14:19:08 +02:00
committed by Gav Wood
parent d8af9f4e7b
commit bc167a211b
85 changed files with 2233 additions and 1923 deletions
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137
ethcore/src/engines/null_engine.rs
View File

@@ -14,103 +14,92 @@
// 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;
use block::{ExecutedBlock, IsBlock};
use bigint::prelude::U256;
use engines::Engine;
use spec::CommonParams;
use evm::Schedule;
use header::BlockNumber;
use error::Error;
use state::CleanupMode;
use trace::{Tracer, ExecutiveTracer, RewardType};
use parity_machine::{Header, LiveBlock, WithBalances};
/// An engine which does not provide any consensus mechanism and does not seal blocks.
pub struct NullEngine {
params: CommonParams,
builtins: BTreeMap<Address, Builtin>,
/// Params for a null engine.
#[derive(Clone, Default)]
pub struct NullEngineParams {
/// base reward for a block.
pub block_reward: U256,
}
impl NullEngine {
/// Returns new instance of NullEngine with default VM Factory
pub fn new(params: CommonParams, builtins: BTreeMap<Address, Builtin>) -> Self {
NullEngine{
params: params,
builtins: builtins,
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),
}
}
}
impl Default for NullEngine {
/// 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 Engine for NullEngine {
impl<M: WithBalances> Engine<M> for NullEngine<M> {
fn name(&self) -> &str {
"NullEngine"
}
fn params(&self) -> &CommonParams {
&self.params
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 builtins(&self) -> &BTreeMap<Address, Builtin> {
&self.builtins
}
fn schedule(&self, _block_number: BlockNumber) -> Schedule {
Schedule::new_homestead()
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)))
}
fn on_close_block(&self, block: &mut ExecutedBlock) -> Result<(), Error> {
if self.params.block_reward == U256::zero() {
// we don't have to apply reward in this case
return Ok(())
}
/// Block reward
let tracing_enabled = block.tracing_enabled();
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
)?;
if tracing_enabled {
let block_author = fields.header.author().clone();
tracer.trace_reward(block_author, result_block_reward, RewardType::Block);
}
/// Uncle rewards
let result_uncle_reward = U256::from(10000000);
for u in fields.uncles.iter() {
let uncle_author = u.author().clone();
fields.state.add_balance(
u.author(),
&(result_uncle_reward),
CleanupMode::NoEmpty
)?;
if tracing_enabled {
tracer.trace_reward(uncle_author, result_uncle_reward, RewardType::Uncle);
}
}
fields.state.commit()?;
if tracing_enabled {
fields.traces.as_mut().map(|mut traces| traces.push(tracer.drain()));
}
Ok(())
}
}