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Sync to peers with confirmed fork block only (#1863)

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This commit is contained in:
Arkadiy Paronyan 2016-08-07 22:42:35 +02:00 committed by Gav Wood
parent e72fc5398a
commit 4f32a9ccc1
1 changed files with 37 additions and 18 deletions
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55
sync/src/chain.rs
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@ -199,6 +199,16 @@ enum PeerAsking {
Heads,
}
#[derive(Clone, Eq, PartialEq)]
enum ForkConfirmation {
/// Fork block confirmation pending.
Unconfirmed,
/// Peers chain is too short to confirm the fork.
TooShort,
/// Fork is confurmed.
Confirmed,
}
#[derive(Clone)]
/// Syncing peer information
struct PeerInfo {
@ -224,13 +234,17 @@ struct PeerInfo {
ask_time: f64,
/// Pending request is expird and result should be ignored
expired: bool,
/// Peer fork confirmed
confirmed: bool,
/// Peer fork confirmation status
confirmation: ForkConfirmation,
}
impl PeerInfo {
fn is_available(&self) -> bool {
self.confirmed && !self.expired
fn can_sync(&self) -> bool {
self.confirmation == ForkConfirmation::Confirmed && !self.expired
}
fn is_allowed(&self) -> bool {
self.confirmation != ForkConfirmation::Unconfirmed && !self.expired
}
}
@ -307,8 +321,8 @@ impl ChainSync {
highest_block_number: self.highest_block.map(|n| max(n, self.last_imported_block)),
blocks_received: if self.last_imported_block > self.starting_block { self.last_imported_block - self.starting_block } else { 0 },
blocks_total: match self.highest_block { Some(x) if x > self.starting_block => x - self.starting_block, _ => 0 },
num_peers: self.peers.values().filter(|p| p.confirmed).count(),
num_active_peers: self.peers.values().filter(|p| p.confirmed && p.asking != PeerAsking::Nothing).count(),
num_peers: self.peers.values().filter(|p| p.is_allowed()).count(),
num_active_peers: self.peers.values().filter(|p| p.is_allowed() && p.asking != PeerAsking::Nothing).count(),
mem_used:
self.blocks.heap_size()
+ self.peers.heap_size_of_children()
@ -330,7 +344,7 @@ impl ChainSync {
p.asking_blocks.clear();
p.asking_hash = None;
// mark any pending requests as expired
if p.asking != PeerAsking::Nothing && p.confirmed {
if p.asking != PeerAsking::Nothing && p.is_allowed() {
p.expired = true;
}
}
@ -384,7 +398,7 @@ impl ChainSync {
asking_hash: None,
ask_time: 0f64,
expired: false,
confirmed: self.fork_block.is_none(),
confirmation: if self.fork_block.is_none() { ForkConfirmation::Confirmed } else { ForkConfirmation::Unconfirmed },
};
trace!(target: "sync", "New peer {} (protocol: {}, network: {:?}, difficulty: {:?}, latest:{}, genesis:{})", peer_id, peer.protocol_version, peer.network_id, peer.difficulty, peer.latest_hash, peer.genesis);
@ -427,14 +441,19 @@ impl ChainSync {
Some(ref mut peer) if peer.asking == PeerAsking::ForkHeader => {
let item_count = r.item_count();
if item_count == 0 || (item_count == 1 && try!(r.at(0)).as_raw().sha3() == self.fork_block.unwrap().1) {
trace!(target: "sync", "{}: Confirmed peer", peer_id);
peer.asking = PeerAsking::Nothing;
peer.confirmed = true;
if item_count == 0 {
trace!(target: "sync", "{}: Chain is too short to confirm the block", peer_id);
peer.confirmation = ForkConfirmation::TooShort;
} else {
trace!(target: "sync", "{}: Confirmed peer", peer_id);
peer.confirmation = ForkConfirmation::Confirmed;
}
true
} else {
trace!(target: "sync", "{}: Fork mismatch", peer_id);
io.disconnect_peer(peer_id);
false
return Ok(());
}
},
_ => false,
@ -586,7 +605,7 @@ impl ChainSync {
/// Called by peer once it has new block bodies
#[cfg_attr(feature="dev", allow(cyclomatic_complexity))]
fn on_peer_new_block(&mut self, io: &mut SyncIo, peer_id: PeerId, r: &UntrustedRlp) -> Result<(), PacketDecodeError> {
if !self.peers.get(&peer_id).map_or(false, |p| p.confirmed) {
if !self.peers.get(&peer_id).map_or(false, |p| p.can_sync()) {
trace!(target: "sync", "Ignoring new block from unconfirmed peer {}", peer_id);
return Ok(());
}
@ -654,7 +673,7 @@ impl ChainSync {
/// Handles `NewHashes` packet. Initiates headers download for any unknown hashes.
fn on_peer_new_hashes(&mut self, io: &mut SyncIo, peer_id: PeerId, r: &UntrustedRlp) -> Result<(), PacketDecodeError> {
if !self.peers.get(&peer_id).map_or(false, |p| p.confirmed) {
if !self.peers.get(&peer_id).map_or(false, |p| p.can_sync()) {
trace!(target: "sync", "Ignoring new hashes from unconfirmed peer {}", peer_id);
return Ok(());
}
@ -741,7 +760,7 @@ impl ChainSync {
/// Resume downloading
fn continue_sync(&mut self, io: &mut SyncIo) {
let mut peers: Vec<(PeerId, U256)> = self.peers.iter().filter_map(|(k, p)|
if p.is_available() { Some((*k, p.difficulty.unwrap_or_else(U256::zero))) } else { None }).collect();
if p.can_sync() { Some((*k, p.difficulty.unwrap_or_else(U256::zero))) } else { None }).collect();
thread_rng().shuffle(&mut peers); //TODO: sort by rating
trace!(target: "sync", "Syncing with {}/{} peers", self.active_peers.len(), peers.len());
for (p, _) in peers {
@ -749,7 +768,7 @@ impl ChainSync {
self.sync_peer(io, p, false);
}
}
if self.state != SyncState::Waiting && !self.peers.values().any(|p| p.asking != PeerAsking::Nothing && p.is_available()) {
if self.state != SyncState::Waiting && !self.peers.values().any(|p| p.asking != PeerAsking::Nothing && p.can_sync()) {
self.complete_sync();
}
}
@ -775,7 +794,7 @@ impl ChainSync {
}
let (peer_latest, peer_difficulty) = {
let peer = self.peers.get_mut(&peer_id).unwrap();
if peer.asking != PeerAsking::Nothing || !peer.is_available() {
if peer.asking != PeerAsking::Nothing || !peer.can_sync() {
return;
}
if self.state == SyncState::Waiting {
@ -1037,7 +1056,7 @@ impl ChainSync {
if !io.is_chain_queue_empty() {
return Ok(());
}
if !self.peers.get(&peer_id).map_or(false, |p| p.confirmed) {
if !self.peers.get(&peer_id).map_or(false, |p| p.can_sync()) {
trace!(target: "sync", "{} Ignoring transactions from unconfirmed/unknown peer", peer_id);
}
@ -1693,7 +1712,7 @@ mod tests {
asking_hash: None,
ask_time: 0f64,
expired: false,
confirmed: true,
confirmation: super::ForkConfirmation::Confirmed,
});
sync
}