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Tendermint fixes (#5415)

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* more resilience

* refactor commit

* fix proposal broadcast

* list encoding

* address grumbles

* to into
This commit is contained in:
keorn 2017-04-10 19:03:18 +01:00 committed by Gav Wood
parent 95808f51f1
commit d3b2bcdd79
6 changed files with 141 additions and 177 deletions
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40
ethcore/src/engines/tendermint/message.rs
View File

@ -61,6 +61,11 @@ pub fn consensus_view(header: &Header) -> Result<View, ::rlp::DecoderError> {
UntrustedRlp::new(view_rlp.as_slice()).as_val()
}
/// Proposal signature.
pub fn proposal_signature(header: &Header) -> Result<H520, ::rlp::DecoderError> {
UntrustedRlp::new(header.seal().get(1).expect("seal passed basic verification; seal has 3 fields; qed").as_slice()).as_val()
}
impl Message for ConsensusMessage {
type Round = VoteStep;
@ -84,34 +89,18 @@ impl ConsensusMessage {
pub fn new_proposal(header: &Header) -> Result<Self, ::rlp::DecoderError> {
Ok(ConsensusMessage {
signature: proposal_signature(header)?,
vote_step: VoteStep::new(header.number() as Height, consensus_view(header)?, Step::Propose),
signature: UntrustedRlp::new(header.seal().get(1).expect("seal passed basic verification; seal has 3 fields; qed").as_slice()).as_val()?,
block_hash: Some(header.bare_hash()),
})
}
pub fn new_commit(proposal: &ConsensusMessage, signature: H520) -> Self {
let mut vote_step = proposal.vote_step.clone();
vote_step.step = Step::Precommit;
ConsensusMessage {
vote_step: vote_step,
block_hash: proposal.block_hash,
signature: signature,
}
}
pub fn verify(&self) -> Result<Address, Error> {
let full_rlp = ::rlp::encode(self);
let block_info = Rlp::new(&full_rlp).at(1);
let public_key = recover(&self.signature.into(), &block_info.as_raw().sha3())?;
Ok(public_to_address(&public_key))
}
pub fn precommit_hash(&self) -> H256 {
let mut vote_step = self.vote_step.clone();
vote_step.step = Step::Precommit;
message_info_rlp(&vote_step, self.block_hash).sha3()
}
}
impl Default for VoteStep {
@ -203,6 +192,10 @@ pub fn message_full_rlp(signature: &H520, vote_info: &Bytes) -> Bytes {
s.out()
}
pub fn message_hash(vote_step: VoteStep, block_hash: H256) -> H256 {
message_info_rlp(&vote_step, Some(block_hash)).sha3()
}
#[cfg(test)]
mod tests {
use util::*;
@ -294,19 +287,6 @@ mod tests {
);
}
#[test]
fn message_info_from_header() {
let header = Header::default();
let pro = ConsensusMessage {
signature: Default::default(),
vote_step: VoteStep::new(0, 0, Step::Propose),
block_hash: Some(header.bare_hash())
};
let pre = message_info_rlp(&VoteStep::new(0, 0, Step::Precommit), Some(header.bare_hash()));
assert_eq!(pro.precommit_hash(), pre.sha3());
}
#[test]
fn step_ordering() {
assert!(VoteStep::new(10, 123, Step::Precommit) < VoteStep::new(11, 123, Step::Precommit));

189
ethcore/src/engines/tendermint/mod.rs
View File

@ -97,6 +97,8 @@ pub struct Tendermint {
proposal: RwLock<Option<H256>>,
/// Hash of the proposal parent block.
proposal_parent: RwLock<H256>,
/// Last block proposed by this validator.
last_proposed: RwLock<H256>,
/// Set used to determine the current validators.
validators: Box<ValidatorSet>,
}
@ -122,6 +124,7 @@ impl Tendermint {
last_lock: AtomicUsize::new(0),
proposal: RwLock::new(None),
proposal_parent: Default::default(),
last_proposed: Default::default(),
validators: new_validator_set(our_params.validators),
});
let handler = TransitionHandler::new(Arc::downgrade(&engine) as Weak<Engine>, Box::new(our_params.timeouts));
@ -196,6 +199,7 @@ impl Tendermint {
self.height.store(new_height, AtomicOrdering::SeqCst);
self.view.store(0, AtomicOrdering::SeqCst);
*self.lock_change.write() = None;
*self.proposal.write() = None;
}
/// Use via step_service to transition steps.
@ -206,7 +210,6 @@ impl Tendermint {
*self.step.write() = step;
match step {
Step::Propose => {
*self.proposal.write() = None;
self.update_sealing()
},
Step::Prevote => {
@ -230,28 +233,6 @@ impl Tendermint {
},
Step::Commit => {
trace!(target: "engine", "to_step: Commit.");
// Commit the block using a complete signature set.
let view = self.view.load(AtomicOrdering::SeqCst);
let height = self.height.load(AtomicOrdering::SeqCst);
if let Some(block_hash) = *self.proposal.read() {
// Generate seal and remove old votes.
if self.is_signer_proposer(&*self.proposal_parent.read()) {
let proposal_step = VoteStep::new(height, view, Step::Propose);
let precommit_step = VoteStep::new(proposal_step.height, proposal_step.view, Step::Precommit);
if let Some(seal) = self.votes.seal_signatures(proposal_step, precommit_step, &block_hash) {
trace!(target: "engine", "Collected seal: {:?}", seal);
let seal = vec![
::rlp::encode(&view).to_vec(),
::rlp::encode(&seal.proposal).to_vec(),
::rlp::encode_list(&seal.votes).to_vec()
];
self.submit_seal(block_hash, seal);
self.to_next_height(height);
} else {
warn!(target: "engine", "Not enough votes found!");
}
}
}
},
}
}
@ -260,8 +241,17 @@ impl Tendermint {
self.validators.contains(&*self.proposal_parent.read(), address)
}
fn is_above_threshold(&self, n: usize) -> bool {
n > self.validators.count(&*self.proposal_parent.read()) * 2/3
fn check_above_threshold(&self, n: usize) -> Result<(), EngineError> {
let threshold = self.validators.count(&*self.proposal_parent.read()) * 2/3;
if n > threshold {
Ok(())
} else {
Err(EngineError::BadSealFieldSize(OutOfBounds {
min: Some(threshold),
max: None,
found: n
}))
}
}
/// Find the designated for the given view.
@ -272,7 +262,7 @@ impl Tendermint {
}
/// Check if address is a proposer for given view.
fn is_view_proposer(&self, bh: &H256, height: Height, view: View, address: &Address) -> Result<(), EngineError> {
fn check_view_proposer(&self, bh: &H256, height: Height, view: View, address: &Address) -> Result<(), EngineError> {
let proposer = self.view_proposer(bh, height, view);
if proposer == *address {
Ok(())
@ -308,13 +298,13 @@ impl Tendermint {
fn has_enough_any_votes(&self) -> bool {
let step_votes = self.votes.count_round_votes(&VoteStep::new(self.height.load(AtomicOrdering::SeqCst), self.view.load(AtomicOrdering::SeqCst), *self.step.read()));
self.is_above_threshold(step_votes)
self.check_above_threshold(step_votes).is_ok()
}
fn has_enough_future_step_votes(&self, vote_step: &VoteStep) -> bool {
if vote_step.view > self.view.load(AtomicOrdering::SeqCst) {
let step_votes = self.votes.count_round_votes(vote_step);
self.is_above_threshold(step_votes)
self.check_above_threshold(step_votes).is_ok()
} else {
false
}
@ -322,7 +312,7 @@ impl Tendermint {
fn has_enough_aligned_votes(&self, message: &ConsensusMessage) -> bool {
let aligned_count = self.votes.count_aligned_votes(&message);
self.is_above_threshold(aligned_count)
self.check_above_threshold(aligned_count).is_ok()
}
fn handle_valid_message(&self, message: &ConsensusMessage) {
@ -337,18 +327,32 @@ impl Tendermint {
&& self.has_enough_aligned_votes(message);
if lock_change {
trace!(target: "engine", "handle_valid_message: Lock change.");
*self.lock_change.write() = Some(message.clone());
*self.lock_change.write() = Some(message.clone());
}
// Check if it can affect the step transition.
if self.is_height(message) {
let next_step = match *self.step.read() {
Step::Precommit if message.block_hash.is_none() && self.has_enough_aligned_votes(message) => {
self.increment_view(1);
Some(Step::Propose)
},
Step::Precommit if self.has_enough_aligned_votes(message) => {
if message.block_hash.is_none() {
self.increment_view(1);
Some(Step::Propose)
} else {
Some(Step::Commit)
let bh = message.block_hash.expect("previous guard ensures is_some; qed");
if *self.last_proposed.read() == bh {
// Commit the block using a complete signature set.
// Generate seal and remove old votes.
let precommits = self.votes.round_signatures(vote_step, &bh);
trace!(target: "engine", "Collected seal: {:?}", precommits);
let seal = vec![
::rlp::encode(&vote_step.view).to_vec(),
::rlp::NULL_RLP.to_vec(),
::rlp::encode_list(&precommits).to_vec()
];
self.submit_seal(bh, seal);
self.votes.throw_out_old(&vote_step);
}
self.to_next_height(self.height.load(AtomicOrdering::SeqCst));
Some(Step::Commit)
},
Step::Precommit if self.has_enough_future_step_votes(&vote_step) => {
self.increment_view(vote_step.view - self.view.load(AtomicOrdering::SeqCst));
@ -442,6 +446,8 @@ impl Engine for Tendermint {
// Insert Propose vote.
debug!(target: "engine", "Submitting proposal {} at height {} view {}.", header.bare_hash(), height, view);
self.votes.vote(ConsensusMessage::new(signature, height, view, Step::Propose, bh), author);
// Remember the owned block.
*self.last_proposed.write() = header.bare_hash();
// Remember proposal for later seal submission.
*self.proposal.write() = bh;
*self.proposal_parent.write() = header.parent_hash().clone();
@ -462,12 +468,12 @@ impl Engine for Tendermint {
if !self.votes.is_old_or_known(&message) {
let sender = public_to_address(&recover(&message.signature.into(), &rlp.at(1)?.as_raw().sha3())?);
if !self.is_authority(&sender) {
Err(EngineError::NotAuthorized(sender))?;
return Err(EngineError::NotAuthorized(sender).into());
}
self.broadcast_message(rlp.as_raw().to_vec());
if self.votes.vote(message.clone(), &sender).is_some() {
self.validators.report_malicious(&sender);
Err(EngineError::DoubleVote(sender))?
return Err(EngineError::DoubleVote(sender).into());
}
trace!(target: "engine", "Handling a valid {:?} from {}.", message, sender);
self.handle_valid_message(&message);
@ -491,22 +497,19 @@ impl Engine for Tendermint {
fn verify_block_basic(&self, header: &Header, _block: Option<&[u8]>) -> Result<(), Error> {
let seal_length = header.seal().len();
if seal_length == self.seal_fields() {
let signatures_len = header.seal()[2].len();
if signatures_len >= 1 {
// Either proposal or commit.
if (header.seal()[1] == ::rlp::NULL_RLP.to_vec())
!= (header.seal()[2] == ::rlp::EMPTY_LIST_RLP.to_vec()) {
Ok(())
} else {
Err(From::from(EngineError::BadSealFieldSize(OutOfBounds {
min: Some(1),
max: None,
found: signatures_len
})))
warn!(target: "engine", "verify_block_basic: Block is neither a Commit nor Proposal.");
Err(BlockError::InvalidSeal.into())
}
} else {
Err(From::from(BlockError::InvalidSealArity(
Err(BlockError::InvalidSealArity(
Mismatch { expected: self.seal_fields(), found: seal_length }
)))
).into())
}
}
fn verify_block_unordered(&self, _header: &Header, _block: Option<&[u8]>) -> Result<(), Error> {
@ -515,50 +518,42 @@ impl Engine for Tendermint {
/// Verify validators and gas limit.
fn verify_block_family(&self, header: &Header, parent: &Header, _block: Option<&[u8]>) -> Result<(), Error> {
let proposal = ConsensusMessage::new_proposal(header)?;
let proposer = proposal.verify()?;
if !self.is_authority(&proposer) {
Err(EngineError::NotAuthorized(proposer))?
}
let precommit_hash = proposal.precommit_hash();
let ref signatures_field = header.seal()[2];
let mut signature_count = 0;
let mut origins = HashSet::new();
for rlp in UntrustedRlp::new(signatures_field).iter() {
let precommit: ConsensusMessage = ConsensusMessage::new_commit(&proposal, rlp.as_val()?);
let address = match self.votes.get(&precommit) {
Some(a) => a,
None => public_to_address(&recover(&precommit.signature.into(), &precommit_hash)?),
};
if !self.validators.contains(header.parent_hash(), &address) {
Err(EngineError::NotAuthorized(address.to_owned()))?
}
if origins.insert(address) {
signature_count += 1;
} else {
warn!(target: "engine", "verify_block_unordered: Duplicate signature from {} on the seal.", address);
Err(BlockError::InvalidSeal)?;
}
}
// Check if its a proposal if there is not enough precommits.
if !self.is_above_threshold(signature_count) {
let signatures_len = signatures_field.len();
// Proposal has to have an empty signature list.
if signatures_len != 1 {
Err(EngineError::BadSealFieldSize(OutOfBounds {
min: Some(1),
max: Some(1),
found: signatures_len
}))?;
}
self.is_view_proposer(header.parent_hash(), proposal.vote_step.height, proposal.vote_step.view, &proposer)?;
}
if header.number() == 0 {
Err(BlockError::RidiculousNumber(OutOfBounds { min: Some(1), max: None, found: header.number() }))?;
return Err(BlockError::RidiculousNumber(OutOfBounds { min: Some(1), max: None, found: header.number() }).into());
}
if let Ok(proposal) = ConsensusMessage::new_proposal(header) {
let proposer = proposal.verify()?;
if !self.is_authority(&proposer) {
return Err(EngineError::NotAuthorized(proposer).into());
}
self.check_view_proposer(header.parent_hash(), proposal.vote_step.height, proposal.vote_step.view, &proposer)?;
} else {
let vote_step = VoteStep::new(header.number() as usize, consensus_view(header)?, Step::Precommit);
let precommit_hash = message_hash(vote_step.clone(), header.bare_hash());
let ref signatures_field = header.seal().get(2).expect("block went through verify_block_basic; block has .seal_fields() fields; qed");
let mut origins = HashSet::new();
for rlp in UntrustedRlp::new(signatures_field).iter() {
let precommit = ConsensusMessage {
signature: rlp.as_val()?,
block_hash: Some(header.bare_hash()),
vote_step: vote_step.clone(),
};
let address = match self.votes.get(&precommit) {
Some(a) => a,
None => public_to_address(&recover(&precommit.signature.into(), &precommit_hash)?),
};
if !self.validators.contains(header.parent_hash(), &address) {
return Err(EngineError::NotAuthorized(address.to_owned()).into());
}
if !origins.insert(address) {
warn!(target: "engine", "verify_block_unordered: Duplicate signature from {} on the seal.", address);
return Err(BlockError::InvalidSeal.into());
}
}
self.check_above_threshold(origins.len())?
}
let gas_limit_divisor = self.gas_limit_bound_divisor;
@ -566,7 +561,7 @@ impl Engine for Tendermint {
let max_gas = parent.gas_limit().clone() + parent.gas_limit().clone() / gas_limit_divisor;
if header.gas_limit() <= &min_gas || header.gas_limit() >= &max_gas {
self.validators.report_malicious(header.author());
Err(BlockError::InvalidGasLimit(OutOfBounds { min: Some(min_gas), max: Some(max_gas), found: header.gas_limit().clone() }))?;
return Err(BlockError::InvalidGasLimit(OutOfBounds { min: Some(min_gas), max: Some(max_gas), found: header.gas_limit().clone() }).into());
}
Ok(())
@ -590,13 +585,14 @@ impl Engine for Tendermint {
fn is_proposal(&self, header: &Header) -> bool {
let signatures_len = header.seal()[2].len();
// Signatures have to be an empty list rlp.
let proposal = ConsensusMessage::new_proposal(header).expect("block went through full verification; this Engine verifies new_proposal creation; qed");
if signatures_len != 1 {
// New Commit received, skip to next height.
trace!(target: "engine", "Received a commit: {:?}.", proposal.vote_step);
self.to_next_height(proposal.vote_step.height);
trace!(target: "engine", "Received a commit: {:?}.", header.number());
self.to_next_height(header.number() as usize);
self.to_step(Step::Commit);
return false;
}
let proposal = ConsensusMessage::new_proposal(header).expect("block went through full verification; this Engine verifies new_proposal creation; qed");
let proposer = proposal.verify().expect("block went through full verification; this Engine tries verify; qed");
debug!(target: "engine", "Received a new proposal {:?} from {}.", proposal.vote_step, proposer);
if self.is_view(&proposal) {
@ -647,6 +643,10 @@ impl Engine for Tendermint {
}
fn register_client(&self, client: Weak<Client>) {
use client::BlockChainClient;
if let Some(c) = client.upgrade() {
self.height.store(c.chain_info().best_block_number as usize + 1, AtomicOrdering::SeqCst);
}
*self.client.write() = Some(client.clone());
self.validators.register_contract(client);
}
@ -825,6 +825,7 @@ mod tests {
let vote_info = message_info_rlp(&VoteStep::new(2, 0, Step::Precommit), Some(header.bare_hash()));
let signature1 = tap.sign(proposer, None, vote_info.sha3()).unwrap();
seal[1] = ::rlp::NULL_RLP.to_vec();
seal[2] = ::rlp::encode_list(&vec![H520::from(signature1.clone())]).to_vec();
header.set_seal(seal.clone());

40
ethcore/src/engines/vote_collector.rs
View File

@ -136,30 +136,14 @@ impl <M: Message + Default + Encodable + Debug> VoteCollector<M> {
*guard = new_collector;
}
/// Collects the signatures used to seal a block.
pub fn seal_signatures(&self, proposal_round: M::Round, commit_round: M::Round, block_hash: &H256) -> Option<SealSignatures> {
let ref bh = Some(*block_hash);
let maybe_seal = {
let guard = self.votes.read();
guard
.get(&proposal_round)
.and_then(|c| c.block_votes.get(bh))
.and_then(|proposals| proposals.keys().next())
.map(|proposal| SealSignatures {
proposal: proposal.clone(),
votes: guard
.get(&commit_round)
.and_then(|c| c.block_votes.get(bh))
.map(|precommits| precommits.keys().cloned().collect())
.unwrap_or_else(Vec::new),
})
.and_then(|seal| if seal.votes.is_empty() { None } else { Some(seal) })
};
if maybe_seal.is_some() {
// Remove messages that are no longer relevant.
self.throw_out_old(&commit_round);
}
maybe_seal
/// Collects the signatures for a given round and hash.
pub fn round_signatures(&self, round: &M::Round, block_hash: &H256) -> Vec<H520> {
let guard = self.votes.read();
guard
.get(round)
.and_then(|c| c.block_votes.get(&Some(*block_hash)))
.map(|votes| votes.keys().cloned().collect())
.unwrap_or_else(Vec::new)
}
/// Count votes which agree with the given message.
@ -275,11 +259,9 @@ mod tests {
random_vote(&collector, signatures[1].clone(), commit_round.clone(), bh.clone());
// Wrong round, same signature.
random_vote(&collector, signatures[1].clone(), 7, bh.clone());
let seal = SealSignatures {
proposal: signatures[0],
votes: signatures[1..3].to_vec()
};
assert_eq!(seal, collector.seal_signatures(propose_round, commit_round, &bh.unwrap()).unwrap());
assert_eq!(signatures[0..1].to_vec(), collector.round_signatures(&propose_round, &bh.unwrap()));
assert_eq!(signatures[1..3].iter().collect::<HashSet<_>>(), collector.round_signatures(&commit_round, &bh.unwrap()).iter().collect::<HashSet<_>>());
}
#[test]

2
sync/src/chain.rs
View File

@ -2132,7 +2132,7 @@ impl ChainSync {
let queue_info = io.chain().queue_info();
let is_syncing = self.status().is_syncing(queue_info);
if !is_syncing || !sealed.is_empty() {
if !is_syncing || !sealed.is_empty() || !proposed.is_empty() {
trace!(target: "sync", "Propagating blocks, state={:?}", self.state);
self.propagate_latest_blocks(io, sealed);
self.propagate_proposed_blocks(io, proposed);

4
sync/src/tests/consensus.rs
View File

@ -196,8 +196,8 @@ fn tendermint() {
// Propose
net.peer(0).chain.engine().step();
net.peer(1).chain.engine().step();
net.peer(0).chain.miner().import_own_transaction(&*net.peer(0).chain, new_tx(s0.secret(), 2.into())).unwrap();
net.peer(1).chain.miner().import_own_transaction(&*net.peer(1).chain, new_tx(s1.secret(), 2.into())).unwrap();
net.peer(0).chain.miner().import_own_transaction(&*net.peer(0).chain, new_tx(s0.secret(), 2.into())).unwrap();
net.peer(1).chain.miner().import_own_transaction(&*net.peer(1).chain, new_tx(s1.secret(), 2.into())).unwrap();
// Send different prevotes
net.sync();
// Prevote timeout

43
sync/src/tests/helpers.rs
View File

@ -277,31 +277,32 @@ impl TestNet<EthPeer<EthcoreClient>> {
started: false,
disconnect_events: Vec::new(),
};
for _ in 0..n {
let spec = spec_factory();
let client = EthcoreClient::new(
ClientConfig::default(),
&spec,
Arc::new(::util::kvdb::in_memory(::ethcore::db::NUM_COLUMNS.unwrap_or(0))),
Arc::new(Miner::with_spec_and_accounts(&spec, accounts.clone())),
IoChannel::disconnected(),
).unwrap();
let ss = Arc::new(TestSnapshotService::new());
let sync = ChainSync::new(config.clone(), &*client);
let peer = Arc::new(EthPeer {
sync: RwLock::new(sync),
snapshot_service: ss,
chain: client,
queue: RwLock::new(VecDeque::new()),
});
peer.chain.add_notify(peer.clone());
net.peers.push(peer);
net.add_peer(config.clone(), spec_factory(), accounts.clone());
}
net
}
pub fn add_peer(&mut self, config: SyncConfig, spec: Spec, accounts: Option<Arc<AccountProvider>>) {
let client = EthcoreClient::new(
ClientConfig::default(),
&spec,
Arc::new(::util::kvdb::in_memory(::ethcore::db::NUM_COLUMNS.unwrap_or(0))),
Arc::new(Miner::with_spec_and_accounts(&spec, accounts)),
IoChannel::disconnected(),
).unwrap();
let ss = Arc::new(TestSnapshotService::new());
let sync = ChainSync::new(config, &*client);
let peer = Arc::new(EthPeer {
sync: RwLock::new(sync),
snapshot_service: ss,
chain: client,
queue: RwLock::new(VecDeque::new()),
});
peer.chain.add_notify(peer.clone());
self.peers.push(peer);
}
}
impl<P> TestNet<P> where P: Peer {