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Don't attempt to synchronize with peers that we know have inferior chain

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catbref 2019-07-05 13:46:19 +01:00
parent 82910b6524
commit 67c245bb9d
1 changed files with 20 additions and 1 deletions
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21
src/main/java/org/qora/controller/Controller.java
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@ -103,6 +103,11 @@ public class Controller extends Thread {
private long repositoryBackupTimestamp = startTime + REPOSITORY_BACKUP_PERIOD;
private long ntpNagTimestamp = startTime + NTP_NAG_PERIOD;
/** Signature of peer's latest block when we tried to sync but peer had inferior chain. */
private byte[] inferiorChainPeerBlockSignature = null;
/** Signature of our latest block when we tried to sync but peer had inferior chain. */
private byte[] inferiorChainOurBlockSignature = null;
/**
* Map of recent requests for ARBITRARY transaction data payloads.
* <p>
@ -343,11 +348,18 @@ public class Controller extends Thread {
// Disregard peers that have no block signature or the same block signature as us
peers.removeIf(peer -> peer.getLastBlockSignature() == null || Arrays.equals(latestBlockData.getSignature(), peer.getLastBlockSignature()));
// Disregard peer we used last time, if both we and they are still on the same block and we didn't like their chain
if (inferiorChainOurBlockSignature != null && Arrays.equals(inferiorChainOurBlockSignature, latestBlockData.getSignature()))
peers.removeIf(peer -> Arrays.equals(inferiorChainPeerBlockSignature, peer.getLastBlockSignature()));
if (!peers.isEmpty()) {
// Pick random peer to sync with
int index = new SecureRandom().nextInt(peers.size());
Peer peer = peers.get(index);
inferiorChainOurBlockSignature = null;
inferiorChainPeerBlockSignature = null;
SynchronizationResult syncResult = Synchronizer.getInstance().synchronize(peer, false);
switch (syncResult) {
case GENESIS_ONLY:
@ -372,8 +384,14 @@ public class Controller extends Thread {
}
break;
case NO_REPLY:
case INFERIOR_CHAIN:
inferiorChainOurBlockSignature = latestBlockData.getSignature();
inferiorChainPeerBlockSignature = peer.getLastBlockSignature();
// These are minor failure results so fine to try again
LOGGER.debug(() -> String.format("Refused to synchronize with peer %s (%s)", peer, syncResult.name()));
break;
case NO_REPLY:
case NO_BLOCKCHAIN_LOCK:
case REPOSITORY_ISSUE:
// These are minor failure results so fine to try again
@ -382,6 +400,7 @@ public class Controller extends Thread {
case OK:
updateSysTray();
// fall-through...
case NOTHING_TO_DO:
LOGGER.debug(() -> String.format("Synchronized with peer %s (%s)", peer, syncResult.name()));
break;