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Fixed block/hashes propagation

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This commit is contained in:
arkpar
2016-05-29 00:38:10 +02:00
parent 1e8bf8c89d
commit 7f3ba85a3f
2 changed files with 20 additions and 20 deletions
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35
sync/src/chain.rs
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@@ -1165,24 +1165,23 @@ impl ChainSync {
.collect::<Vec<_>>()
}
fn select_lagging_peers(&mut self, chain_info: &BlockChainInfo, io: &mut SyncIo) -> Vec<(PeerId, BlockNumber)> {
use rand::Rng;
let mut lagging_peers = self.get_lagging_peers(chain_info, io);
// take sqrt(x) peers
let mut count = (self.peers.len() as f64).powf(0.5).round() as usize;
count = min(count, MAX_PEERS_PROPAGATION);
count = max(count, MIN_PEERS_PROPAGATION);
::rand::thread_rng().shuffle(&mut lagging_peers);
lagging_peers.into_iter().take(count).collect::<Vec<_>>()
}
/// propagates latest block to lagging peers
fn propagate_blocks(&mut self, chain_info: &BlockChainInfo, io: &mut SyncIo) -> usize {
let updated_peers = {
let lagging_peers = self.get_lagging_peers(chain_info, io);
// sqrt(x)/x scaled to max u32
let fraction = (self.peers.len() as f64).powf(-0.5).mul(u32::max_value() as f64).round() as u32;
let lucky_peers = match lagging_peers.len() {
0 ... MIN_PEERS_PROPAGATION => lagging_peers,
_ => lagging_peers.into_iter().filter(|_| ::rand::random::<u32>() < fraction).collect::<Vec<_>>()
};
// taking at max of MAX_PEERS_PROPAGATION
lucky_peers.iter().map(|&(id, _)| id.clone()).take(min(lucky_peers.len(), MAX_PEERS_PROPAGATION)).collect::<Vec<PeerId>>()
};
let lucky_peers = self.select_lagging_peers(chain_info, io);
let mut sent = 0;
for peer_id in updated_peers {
for (peer_id, _) in lucky_peers {
let rlp = ChainSync::create_latest_block_rlp(io.chain());
self.send_packet(io, peer_id, NEW_BLOCK_PACKET, rlp);
self.peers.get_mut(&peer_id).unwrap().latest_hash = chain_info.best_block_hash.clone();
@@ -1194,12 +1193,12 @@ impl ChainSync {
/// propagates new known hashes to all peers
fn propagate_new_hashes(&mut self, chain_info: &BlockChainInfo, io: &mut SyncIo) -> usize {
let updated_peers = self.get_lagging_peers(chain_info, io);
let lucky_peers = self.select_lagging_peers(chain_info, io);
let mut sent = 0;
let last_parent = HeaderView::new(&io.chain().block_header(BlockID::Hash(chain_info.best_block_hash.clone())).unwrap()).parent_hash();
for (peer_id, peer_number) in updated_peers {
for (peer_id, peer_number) in lucky_peers {
let mut peer_best = self.peers.get(&peer_id).unwrap().latest_hash.clone();
if chain_info.best_block_number - peer_number > MAX_PEERS_PROPAGATION as BlockNumber {
if chain_info.best_block_number - peer_number > MAX_PEER_LAG_PROPAGATION as BlockNumber {
// If we think peer is too far behind just send one latest hash
peer_best = last_parent.clone();
}