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return errors from constructor

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This commit is contained in:
keorn 2016-11-15 10:21:18 +00:00
parent dd8ed42270
commit 54e4956345
2 changed files with 126 additions and 102 deletions
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226
ethcore/src/engines/tendermint/mod.rs
View File

@ -19,11 +19,11 @@
mod message;
mod timeout;
mod params;
mod vote;
mod vote_collector;
use std::sync::atomic::{AtomicUsize, Ordering as AtomicOrdering};
use util::*;
use basic_types::Seal;
use error::{Error, BlockError};
use header::Header;
use builtin::Builtin;
@ -42,16 +42,14 @@ use io::IoService;
use self::message::ConsensusMessage;
use self::timeout::{TimerHandler, NextStep};
use self::params::TendermintParams;
use self::vote::Vote;
use self::vote_collector::VoteCollector;
#[derive(Debug)]
enum Step {
#[derive(Debug, PartialEq, Eq)]
pub enum Step {
Propose,
Prevote(ProposeCollect),
/// Precommit step storing the precommit vote and accumulating seal.
Precommit(ProposeCollect, Signatures),
/// Commit step storing a complete valid seal.
Commit(BlockHash, Signatures)
Prevote,
Precommit,
Commit
}
pub type Height = usize;
@ -69,43 +67,45 @@ pub struct Tendermint {
timeout_service: IoService<NextStep>,
/// Address to be used as authority.
authority: RwLock<Address>,
/// Blockchain height.
height: AtomicUsize,
/// Consensus round.
r: AtomicUsize,
round: AtomicUsize,
/// Consensus step.
s: RwLock<Step>,
step: RwLock<Step>,
/// Current step timeout in ms.
timeout: AtomicMs,
/// Used to swith proposer.
proposer_nonce: AtomicUsize,
/// Vote accumulator.
votes: VoteCollector
}
impl Tendermint {
/// Create a new instance of Tendermint engine
pub fn new(params: CommonParams, our_params: TendermintParams, builtins: BTreeMap<Address, Builtin>) -> Arc<Self> {
pub fn new(params: CommonParams, our_params: TendermintParams, builtins: BTreeMap<Address, Builtin>) -> Result<Arc<Self>, Error> {
let engine = Arc::new(
Tendermint {
params: params,
timeout: AtomicUsize::new(our_params.timeouts.propose),
our_params: our_params,
builtins: builtins,
timeout_service: IoService::<NextStep>::start().expect("Error creating engine timeout service"),
timeout_service: try!(IoService::<NextStep>::start()),
authority: RwLock::new(Address::default()),
r: AtomicUsize::new(0),
s: RwLock::new(Step::Propose),
proposer_nonce: AtomicUsize::new(0)
height: AtomicUsize::new(0),
round: AtomicUsize::new(0),
step: RwLock::new(Step::Propose),
proposer_nonce: AtomicUsize::new(0),
votes: VoteCollector::new()
});
let handler = TimerHandler::new(Arc::downgrade(&engine));
engine.timeout_service.register_handler(Arc::new(handler)).expect("Error creating engine timeout service");
engine
}
fn is_proposer(&self, address: &Address) -> bool {
self.is_nonce_proposer(self.proposer_nonce.load(AtomicOrdering::SeqCst), address)
let handler = TimerHandler { engine: Arc::downgrade(&engine) };
try!(engine.timeout_service.register_handler(Arc::new(handler)));
Ok(engine)
}
fn nonce_proposer(&self, proposer_nonce: usize) -> &Address {
let ref p = self.our_params;
p.authorities.get(proposer_nonce%p.authority_n).unwrap()
p.authorities.get(proposer_nonce % p.authority_n).unwrap()
}
fn is_nonce_proposer(&self, proposer_nonce: usize, address: &Address) -> bool {
@ -123,12 +123,12 @@ impl Tendermint {
}
fn to_step(&self, step: Step) {
let mut guard = self.s.try_write().unwrap();
let mut guard = self.step.try_write().unwrap();
*guard = step;
}
fn to_propose(&self) {
trace!(target: "tendermint", "step: entering propose");
trace!(target: "poa", "step: entering propose");
println!("step: entering propose");
self.proposer_nonce.fetch_add(1, AtomicOrdering::Relaxed);
self.to_step(Step::Propose);
@ -136,7 +136,7 @@ impl Tendermint {
fn propose_message(&self, message: UntrustedRlp) -> Result<Bytes, Error> {
// Check if message is for correct step.
match *self.s.try_read().unwrap() {
match *self.step.try_read().unwrap() {
Step::Propose => (),
_ => try!(Err(EngineError::WrongStep)),
}
@ -146,7 +146,7 @@ impl Tendermint {
}
fn to_prevote(&self, proposal: BlockHash) {
trace!(target: "tendermint", "step: entering prevote");
trace!(target: "poa", "step: entering prevote");
println!("step: entering prevote");
// Proceed to the prevote step.
self.to_step(Step::Prevote(self.new_vote(proposal)));
@ -154,8 +154,8 @@ impl Tendermint {
fn prevote_message(&self, sender: Address, message: UntrustedRlp) -> Result<Bytes, Error> {
// Check if message is for correct step.
let hash = match *self.s.try_write().unwrap() {
Step::Prevote(ref mut vote) => {
let hash = match *self.step.try_write().unwrap() {
Step::Prevote => {
// Vote if message is about the right block.
if vote.hash == try!(message.as_val()) {
vote.vote(sender);
@ -178,43 +178,39 @@ impl Tendermint {
}
fn to_precommit(&self, proposal: BlockHash) {
trace!(target: "tendermint", "step: entering precommit");
trace!(target: "poa", "step: entering precommit");
println!("step: entering precommit");
self.to_step(Step::Precommit(self.new_vote(proposal), Vec::new()));
}
fn precommit_message(&self, sender: Address, signature: H520, message: UntrustedRlp) -> Result<Bytes, Error> {
// Check if message is for correct step.
match *self.s.try_write().unwrap() {
Step::Precommit(ref mut vote, ref mut seal) => {
// Vote and accumulate seal if message is about the right block.
if vote.hash == try!(message.as_val()) {
if vote.vote(sender) { seal.push(encode(&signature).to_vec()); }
// Commit if precommit is won.
if vote.is_won() { self.to_commit(vote.hash.clone(), seal.clone()); }
Ok(message.as_raw().to_vec())
} else {
try!(Err(EngineError::WrongVote))
}
},
_ => try!(Err(EngineError::WrongStep)),
}
}
/// Move to commit step, when valid block is known and being distributed.
pub fn to_commit(&self, block_hash: H256, seal: Vec<Bytes>) {
trace!(target: "tendermint", "step: entering commit");
trace!(target: "poa", "step: entering commit");
println!("step: entering commit");
self.to_step(Step::Commit(block_hash, seal));
}
fn threshold(&self) -> usize {
self.our_params.authority_n*2/3
self.our_params.authority_n * 2/3
}
fn next_timeout(&self) -> u64 {
self.timeout.load(AtomicOrdering::Relaxed) as u64
}
/// Round proposer switching.
fn is_proposer(&self, address: &Address) -> bool {
self.is_nonce_proposer(self.proposer_nonce.load(AtomicOrdering::SeqCst), address)
}
fn is_current(&self, message: &ConsensusMessage) -> bool {
message.is_step(self.height.load(AtomicOrdering::SeqCst), self.round.load(AtomicOrdering::SeqCst), self.step.load(AtomicOrdering::SeqCst))
}
}
/// Block hash including the consensus round.
fn block_hash(header: &Header) -> H256 {
header.rlp(Seal::WithSome(1)).sha3()
}
impl Engine for Tendermint {
@ -253,60 +249,79 @@ impl Engine for Tendermint {
}
}
/// Set author to proposer and set the correct round in the seal.
/// Set the correct round in the seal.
/// This assumes that all uncles are valid uncles (i.e. of at least one generation before the current).
fn on_close_block(&self, _block: &mut ExecutedBlock) {
fn on_close_block(&self, block: &mut ExecutedBlock) {
let round = self.round.load(AtomicOrdering::SeqCst);
vec![::rlp::encode(&round).to_vec()]
}
/// Round proposer switching.
fn is_sealer(&self, address: &Address) -> Option<bool> {
Some(self.is_proposer(address))
}
/// Attempt to seal the block internally using all available signatures.
///
/// None is returned if not enough signatures can be collected.
fn generate_seal(&self, block: &ExecutedBlock, accounts: Option<&AccountProvider>) -> Option<Vec<Bytes>> {
if let (Some(ap), Some(step)) = (accounts, self.s.try_read()) {
if let (Some(ap), Some(step)) = (accounts, self.step.try_read()) {
let header = block.header();
let author = header.author();
match *step {
Step::Commit(hash, ref seal) if hash == header.bare_hash() =>
Step::Commit => {
// Commit the block using a complete signature set.
return Some(seal.clone()),
Step::Propose if self.is_proposer(header.author()) =>
let round = self.round.load(AtomicOrdering::SeqCst);
if let Some((proposer, votes)) = self.votes.seal_signatures(header.number() as Height, round, block_hash(header)).split_first() {
if votes.len() + 1 > self.threshold() {
return Some(vec![
::rlp::encode(&round).to_vec(),
::rlp::encode(proposer).to_vec(),
::rlp::encode(&votes).to_vec()
]);
}
}
},
Step::Propose if self.is_proposer(author) =>
// Seal block with propose signature.
if let Some(proposal) = Vote::propose(header, &ap) {
return Some(vec![::rlp::encode(&proposal).to_vec(), Vec::new()])
if let Ok(signature) = ap.sign(*author, None, block_hash(header)) {
return Some(vec![
::rlp::encode(&self.round.load(AtomicOrdering::SeqCst)).to_vec(),
::rlp::encode(&signature.into()).to_vec(),
Vec::new()
])
} else {
trace!(target: "basicauthority", "generate_seal: FAIL: accounts secret key unavailable");
trace!(target: "poa", "generate_seal: FAIL: accounts secret key unavailable");
},
_ => {},
}
} else {
trace!(target: "basicauthority", "generate_seal: FAIL: accounts not provided");
trace!(target: "poa", "generate_seal: FAIL: accounts not provided");
}
None
}
fn handle_message(&self, sender: Address, signature: H520, message: UntrustedRlp) -> Result<Bytes, Error> {
let message: ConsensusMessage = try!(message.as_val());
if self.is_authority(&sender) {
//match message {
// ConsensusMessage::Prevote
//}
fn handle_message(&self, rlp: UntrustedRlp) -> Result<Bytes, Error> {
let message: ConsensusMessage = try!(rlp.as_val());
let sender = public_to_address(&try!(recover(&message.signature.into(), &try!(rlp.at(1)).as_raw().sha3())));
// TODO: Do not admit old messages.
if !self.is_authority(&sender) {
try!(Err(BlockError::InvalidSeal));
}
try!(Err(EngineError::UnknownStep))
// Check if correct round.
//if self.r.load(AtomicOrdering::Relaxed) != try!(message.val_at(0)) {
// try!(Err(EngineError::WrongRound))
//}
// Handle according to step.
// match try!(message.val_at(1)) {
// 0u8 if self.is_proposer(&sender) => self.propose_message(try!(message.at(2))),
// 1 if self.is_authority(&sender) => self.prevote_message(sender, try!(message.at(2))),
// 2 if self.is_authority(&sender) => self.precommit_message(sender, signature, try!(message.at(2))),
// _ => try!(Err(EngineError::UnknownStep)),
// }
// Check if the message affects the current step.
if self.is_current(message) {
match self.step.load(AtomicOrdering::SeqCst) {
Step::Prevote => {
let votes = aligned_signatures(message);
if votes.len() > self.threshold() {
}
},
Step::Precommit => ,
}
}
self.votes.vote(message, sender);
}
fn verify_block_basic(&self, header: &Header, _block: Option<&[u8]>) -> Result<(), Error> {
@ -322,21 +337,28 @@ impl Engine for Tendermint {
/// Also transitions to Prevote if verifying Proposal.
fn verify_block_unordered(&self, header: &Header, _block: Option<&[u8]>) -> Result<(), Error> {
let to_address = |b: &Vec<u8>| {
let sig: H520 = try!(UntrustedRlp::new(b.as_slice()).as_val());
Ok(public_to_address(&try!(recover(&sig.into(), &header.bare_hash()))))
};
let authority_set = self.our_params.authorities.iter().cloned().collect();
let seal_set = try!(header
.seal()
.iter()
.map(to_address)
.collect::<Result<HashSet<_>, Error>>());
if seal_set.intersection(&authority_set).count() <= self.threshold() {
let proposal_signature: H520 = try!(UntrustedRlp::new(header.seal()[1].as_slice()).as_val());
let proposer = public_to_address(&try!(recover(&proposal_signature.into(), &block_hash(header))));
if !self.is_proposer(&proposer) {
try!(Err(BlockError::InvalidSeal))
} else {
Ok(())
}
let proposal = ConsensusMessage {
signature: proposal_signature,
height: header.number() as usize,
round: try!(UntrustedRlp::new(header.seal()[0].as_slice()).as_val()),
step: Step::Propose,
block_hash: Some(block_hash(header))
};
self.votes.vote(proposal, proposer);
let votes_rlp = UntrustedRlp::new(&header.seal()[2]);
for rlp in votes_rlp.iter() {
let sig: H520 = try!(rlp.as_val());
let address = public_to_address(&try!(recover(&sig.into(), &block_hash(header))));
if !self.our_params.authorities.contains(a) {
try!(Err(BlockError::InvalidSeal))
}
}
Ok(())
}
fn verify_block_family(&self, header: &Header, parent: &Header, _block: Option<&[u8]>) -> Result<(), Error> {
@ -368,7 +390,9 @@ impl Engine for Tendermint {
}
fn is_new_best_block(&self, _best_total_difficulty: U256, best_header: HeaderView, _parent_details: &BlockDetails, new_header: &HeaderView) -> bool {
new_header.seal().get(1).expect("Tendermint seal should have two elements.").len() > best_header.seal().get(1).expect("Tendermint seal should have two elements.").len()
let new_signatures = new_header.seal().get(2).expect("Tendermint seal should have three elements.").len();
let best_signatures = best_header.seal().get(2).expect("Tendermint seal should have three elements.").len();
new_signatures > best_signatures
}
}
@ -377,7 +401,7 @@ mod tests {
use std::thread::sleep;
use std::time::{Duration};
use util::*;
use rlp::{UntrustedRlp, RlpStream, Stream, View, encode};
use rlp::{UntrustedRlp, RlpStream, Stream, View};
use block::*;
use error::{Error, BlockError};
use header::Header;
@ -416,11 +440,11 @@ mod tests {
let v0 = tap.insert_account("0".sha3(), "0").unwrap();
let sig0 = tap.sign(v0, Some("0".into()), header.bare_hash()).unwrap();
seal.push(encode(&(&*sig0 as &[u8])).to_vec());
seal.push(::rlp::encode(&(&*sig0 as &[u8])).to_vec());
let v1 = tap.insert_account("1".sha3(), "1").unwrap();
let sig1 = tap.sign(v1, Some("1".into()), header.bare_hash()).unwrap();
seal.push(encode(&(&*sig1 as &[u8])).to_vec());
seal.push(::rlp::encode(&(&*sig1 as &[u8])).to_vec());
seal
}
@ -475,7 +499,7 @@ mod tests {
let v1 = tap.insert_account("0".sha3(), "0").unwrap();
let sig1 = tap.sign(v1, Some("0".into()), header.bare_hash()).unwrap();
seal.push(encode(&(&*sig1 as &[u8])).to_vec());
seal.push(::rlp::encode(&(&*sig1 as &[u8])).to_vec());
header.set_seal(seal.clone());
@ -484,7 +508,7 @@ mod tests {
let v2 = tap.insert_account("101".sha3(), "101").unwrap();
let sig2 = tap.sign(v2, Some("101".into()), header.bare_hash()).unwrap();
seal.push(encode(&(&*sig2 as &[u8])).to_vec());
seal.push(::rlp::encode(&(&*sig2 as &[u8])).to_vec());
header.set_seal(seal);

2
ethcore/src/spec/spec.rs
View File

@ -144,7 +144,7 @@ impl Spec {
ethjson::spec::Engine::InstantSeal => Arc::new(InstantSeal::new(params, builtins)),
ethjson::spec::Engine::Ethash(ethash) => Arc::new(ethereum::Ethash::new(params, From::from(ethash.params), builtins)),
ethjson::spec::Engine::BasicAuthority(basic_authority) => Arc::new(BasicAuthority::new(params, From::from(basic_authority.params), builtins)),
ethjson::spec::Engine::Tendermint(tendermint) => Tendermint::new(params, From::from(tendermint.params), builtins),
ethjson::spec::Engine::Tendermint(tendermint) => Tendermint::new(params, From::from(tendermint.params), builtins).expect("Failed to start the Tendermint consensus engine."),
}
}