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AbstractBitcoinNetParams.checkDifficultyTransitions: More useful exception message when a way back to the last transition point cannot be found.

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Andreas Schildbach 2016-08-24 13:48:43 +02:00 committed by Andreas Schildbach
parent 7b0641e271
commit eccf14adeb
1 changed files with 9 additions and 5 deletions
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14
core/src/main/java/org/bitcoinj/params/AbstractBitcoinNetParams.java
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@ -23,6 +23,7 @@ import java.util.concurrent.TimeUnit;
import org.bitcoinj.core.Block;
import org.bitcoinj.core.Coin;
import org.bitcoinj.core.NetworkParameters;
import org.bitcoinj.core.Sha256Hash;
import org.bitcoinj.core.StoredBlock;
import org.bitcoinj.core.Transaction;
import org.bitcoinj.core.Utils;
@ -75,7 +76,7 @@ public abstract class AbstractBitcoinNetParams extends NetworkParameters {
@Override
public void checkDifficultyTransitions(final StoredBlock storedPrev, final Block nextBlock,
final BlockStore blockStore) throws VerificationException, BlockStoreException {
Block prev = storedPrev.getHeader();
final Block prev = storedPrev.getHeader();
// Is this supposed to be a difficulty transition point?
if (!isDifficultyTransitionPoint(storedPrev.getHeight())) {
@ -91,14 +92,17 @@ public abstract class AbstractBitcoinNetParams extends NetworkParameters {
// We need to find a block far back in the chain. It's OK that this is expensive because it only occurs every
// two weeks after the initial block chain download.
final Stopwatch watch = Stopwatch.createStarted();
StoredBlock cursor = blockStore.get(prev.getHash());
for (int i = 0; i < this.getInterval() - 1; i++) {
Sha256Hash hash = prev.getHash();
StoredBlock cursor = null;
final int interval = this.getInterval();
for (int i = 0; i < interval; i++) {
cursor = blockStore.get(hash);
if (cursor == null) {
// This should never happen. If it does, it means we are following an incorrect or busted chain.
throw new VerificationException(
"Difficulty transition point but we did not find a way back to the genesis block.");
"Difficulty transition point but we did not find a way back to the last transition point. Not found: " + hash);
}
cursor = blockStore.get(cursor.getHeader().getPrevBlockHash());
hash = cursor.getHeader().getPrevBlockHash();
}
watch.stop();
if (watch.elapsed(TimeUnit.MILLISECONDS) > 50)