Maximum uncle count transition (#7196)
* Enable delayed maximum_uncle_count activation. * Fix tests. * Defer kovan HF.
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@ -24,6 +24,7 @@
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},
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"validateScoreTransition": 1000000,
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"validateStepTransition": 1500000,
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"maximumUncleCountTransition": 10000000,
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"maximumUncleCount": 2
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}
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}
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@ -380,8 +380,13 @@ impl<'x> OpenBlock<'x> {
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/// NOTE Will check chain constraints and the uncle number but will NOT check
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/// that the header itself is actually valid.
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pub fn push_uncle(&mut self, valid_uncle_header: Header) -> Result<(), BlockError> {
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if self.block.uncles.len() + 1 > self.engine.maximum_uncle_count() {
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return Err(BlockError::TooManyUncles(OutOfBounds{min: None, max: Some(self.engine.maximum_uncle_count()), found: self.block.uncles.len() + 1}));
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let max_uncles = self.engine.maximum_uncle_count(self.block.header().number());
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if self.block.uncles.len() + 1 > max_uncles {
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return Err(BlockError::TooManyUncles(OutOfBounds{
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min: None,
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max: Some(max_uncles),
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found: self.block.uncles.len() + 1,
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}));
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}
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// TODO: check number
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// TODO: check not a direct ancestor (use last_hashes for that)
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@ -1870,7 +1870,7 @@ impl MiningBlockChainClient for Client {
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.find_uncle_headers(&h, engine.maximum_uncle_age())
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.unwrap_or_else(Vec::new)
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.into_iter()
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.take(engine.maximum_uncle_count())
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.take(engine.maximum_uncle_count(open_block.header().number()))
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.foreach(|h| {
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open_block.push_uncle(h).expect("pushing maximum_uncle_count;
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open_block was just created;
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@ -1885,7 +1885,7 @@ impl MiningBlockChainClient for Client {
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fn reopen_block(&self, block: ClosedBlock) -> OpenBlock {
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let engine = &*self.engine;
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let mut block = block.reopen(engine);
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let max_uncles = engine.maximum_uncle_count();
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let max_uncles = engine.maximum_uncle_count(block.header().number());
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if block.uncles().len() < max_uncles {
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let chain = self.chain.read();
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let h = chain.best_block_hash();
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@ -65,6 +65,8 @@ pub struct AuthorityRoundParams {
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pub immediate_transitions: bool,
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/// Block reward in base units.
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pub block_reward: U256,
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/// Number of accepted uncles transition block.
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pub maximum_uncle_count_transition: u64,
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/// Number of accepted uncles.
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pub maximum_uncle_count: usize,
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}
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@ -79,6 +81,7 @@ impl From<ethjson::spec::AuthorityRoundParams> for AuthorityRoundParams {
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validate_step_transition: p.validate_step_transition.map_or(0, Into::into),
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immediate_transitions: p.immediate_transitions.unwrap_or(false),
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block_reward: p.block_reward.map_or_else(Default::default, Into::into),
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maximum_uncle_count_transition: p.maximum_uncle_count_transition.map_or(0, Into::into),
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maximum_uncle_count: p.maximum_uncle_count.map_or(0, Into::into),
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}
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}
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@ -221,6 +224,7 @@ pub struct AuthorityRound {
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epoch_manager: Mutex<EpochManager>,
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immediate_transitions: bool,
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block_reward: U256,
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maximum_uncle_count_transition: u64,
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maximum_uncle_count: usize,
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machine: EthereumMachine,
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}
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@ -369,6 +373,7 @@ impl AuthorityRound {
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epoch_manager: Mutex::new(EpochManager::blank()),
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immediate_transitions: our_params.immediate_transitions,
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block_reward: our_params.block_reward,
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maximum_uncle_count_transition: our_params.maximum_uncle_count_transition,
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maximum_uncle_count: our_params.maximum_uncle_count,
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machine: machine,
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});
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@ -441,7 +446,14 @@ impl Engine<EthereumMachine> for AuthorityRound {
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]
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}
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fn maximum_uncle_count(&self) -> usize { self.maximum_uncle_count }
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fn maximum_uncle_count(&self, block: BlockNumber) -> usize {
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if block >= self.maximum_uncle_count_transition {
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self.maximum_uncle_count
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} else {
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// fallback to default value
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2
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}
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}
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fn populate_from_parent(&self, header: &mut Header, parent: &Header) {
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// Chain scoring: total weight is sqrt(U256::max_value())*height - step
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@ -956,6 +968,7 @@ mod tests {
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validate_score_transition: 0,
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validate_step_transition: 0,
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immediate_transitions: true,
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maximum_uncle_count_transition: 0,
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maximum_uncle_count: 0,
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block_reward: Default::default(),
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};
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@ -984,4 +997,31 @@ mod tests {
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assert!(aura.verify_block_family(&header, &parent_header).is_ok());
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assert_eq!(last_benign.load(AtomicOrdering::SeqCst), 1);
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}
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#[test]
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fn test_uncles_transition() {
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let last_benign = Arc::new(AtomicUsize::new(0));
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let params = AuthorityRoundParams {
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step_duration: Default::default(),
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start_step: Some(1),
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validators: Box::new(TestSet::new(Default::default(), last_benign.clone())),
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validate_score_transition: 0,
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validate_step_transition: 0,
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immediate_transitions: true,
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maximum_uncle_count_transition: 1,
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maximum_uncle_count: 0,
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block_reward: Default::default(),
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};
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let aura = {
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let mut c_params = ::spec::CommonParams::default();
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c_params.gas_limit_bound_divisor = 5.into();
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let machine = ::machine::EthereumMachine::regular(c_params, Default::default());
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AuthorityRound::new(params, machine).unwrap()
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};
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assert_eq!(aura.maximum_uncle_count(0), 2);
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assert_eq!(aura.maximum_uncle_count(1), 0);
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assert_eq!(aura.maximum_uncle_count(100), 0);
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}
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}
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@ -192,7 +192,8 @@ pub trait Engine<M: Machine>: Sync + Send {
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fn extra_info(&self, _header: &M::Header) -> BTreeMap<String, String> { BTreeMap::new() }
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/// Maximum number of uncles a block is allowed to declare.
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fn maximum_uncle_count(&self) -> usize { 0 }
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fn maximum_uncle_count(&self, _block: BlockNumber) -> usize { 0 }
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/// The number of generations back that uncles can be.
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fn maximum_uncle_age(&self) -> usize { 6 }
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@ -363,7 +364,7 @@ pub trait EthEngine: Engine<::machine::EthereumMachine> {
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}
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/// The nonce with which accounts begin at given block.
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fn account_start_nonce(&self, block: u64) -> U256 {
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fn account_start_nonce(&self, block: BlockNumber) -> U256 {
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self.machine().account_start_nonce(block)
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}
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@ -16,6 +16,7 @@
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use bigint::prelude::U256;
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use engines::Engine;
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use header::BlockNumber;
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use parity_machine::{Header, LiveBlock, WithBalances};
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/// Params for a null engine.
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@ -95,7 +96,7 @@ impl<M: WithBalances> Engine<M> for NullEngine<M> {
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self.machine.note_rewards(block, &[(author, result_block_reward)], &uncle_rewards)
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}
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fn maximum_uncle_count(&self) -> usize { 2 }
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fn maximum_uncle_count(&self, _block: BlockNumber) -> usize { 2 }
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fn verify_local_seal(&self, _header: &M::Header) -> Result<(), M::Error> {
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Ok(())
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@ -450,7 +450,7 @@ impl Engine<EthereumMachine> for Tendermint {
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fn machine(&self) -> &EthereumMachine { &self.machine }
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fn maximum_uncle_count(&self) -> usize { 0 }
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fn maximum_uncle_count(&self, _block: BlockNumber) -> usize { 0 }
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fn maximum_uncle_age(&self) -> usize { 0 }
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@ -26,7 +26,7 @@ use util::Address;
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use unexpected::{OutOfBounds, Mismatch};
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use block::*;
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use error::{BlockError, Error};
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use header::Header;
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use header::{Header, BlockNumber};
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use engines::{self, Engine};
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use ethjson;
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use rlp::{self, UntrustedRlp};
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@ -181,7 +181,7 @@ impl Engine<EthereumMachine> for Arc<Ethash> {
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}
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}
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fn maximum_uncle_count(&self) -> usize { 2 }
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fn maximum_uncle_count(&self, _block: BlockNumber) -> usize { 2 }
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fn populate_from_parent(&self, header: &mut Header, parent: &Header) {
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let difficulty = self.calculate_difficulty(header, parent);
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@ -137,9 +137,14 @@ pub fn verify_block_family(header: &Header, parent: &Header, engine: &EthEngine,
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fn verify_uncles(header: &Header, bytes: &[u8], bc: &BlockProvider, engine: &EthEngine) -> Result<(), Error> {
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let num_uncles = UntrustedRlp::new(bytes).at(2)?.item_count()?;
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let max_uncles = engine.maximum_uncle_count(header.number());
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if num_uncles != 0 {
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if num_uncles > engine.maximum_uncle_count() {
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return Err(From::from(BlockError::TooManyUncles(OutOfBounds { min: None, max: Some(engine.maximum_uncle_count()), found: num_uncles })));
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if num_uncles > max_uncles {
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return Err(From::from(BlockError::TooManyUncles(OutOfBounds {
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min: None,
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max: Some(max_uncles),
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found: num_uncles,
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})));
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}
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let mut excluded = HashSet::new();
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@ -653,7 +658,7 @@ mod tests {
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let mut bad_uncles = good_uncles.clone();
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bad_uncles.push(good_uncle1.clone());
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check_fail(family_test(&create_test_block_with_data(&header, &good_transactions, &bad_uncles), engine, &bc),
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TooManyUncles(OutOfBounds { max: Some(engine.maximum_uncle_count()), min: None, found: bad_uncles.len() }));
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TooManyUncles(OutOfBounds { max: Some(engine.maximum_uncle_count(header.number())), min: None, found: bad_uncles.len() }));
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header = good.clone();
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bad_uncles = vec![ good_uncle1.clone(), good_uncle1.clone() ];
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@ -43,6 +43,10 @@ pub struct AuthorityRoundParams {
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/// Reward per block in wei.
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#[serde(rename="blockReward")]
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pub block_reward: Option<Uint>,
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/// Block at which maximum uncle count should be considered.
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#[serde(rename="maximumUncleCountTransition")]
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pub maximum_uncle_count_transition: Option<Uint>,
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/// Maximum number of accepted uncles.
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#[serde(rename="maximumUncleCount")]
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pub maximum_uncle_count: Option<Uint>,
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}
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@ -73,7 +77,9 @@ mod tests {
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},
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"startStep" : 24,
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"validateStepTransition": 150,
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"blockReward": 5000000
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"blockReward": 5000000,
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"maximumUncleCountTransition": 10000000,
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"maximumUncleCount": 5
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}
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}"#;
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@ -82,6 +88,8 @@ mod tests {
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assert_eq!(deserialized.params.validators, ValidatorSet::List(vec![Address(H160::from("0xc6d9d2cd449a754c494264e1809c50e34d64562b"))]));
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assert_eq!(deserialized.params.start_step, Some(Uint(U256::from(24))));
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assert_eq!(deserialized.params.immediate_transitions, None);
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assert_eq!(deserialized.params.maximum_uncle_count_transition, Some(Uint(10_000_000.into())));
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assert_eq!(deserialized.params.maximum_uncle_count, Some(Uint(5.into())));
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}
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}
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