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added block timestamp too-soon check and relaxed PoS for too-old blocks

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catbref 2018-12-17 14:18:23 +00:00
parent f50b53a407
commit 3045841151
2 changed files with 45 additions and 22 deletions
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60
src/qora/block/Block.java
View File

@ -74,6 +74,7 @@ public class Block {
TIMESTAMP_OLDER_THAN_PARENT(20),
TIMESTAMP_IN_FUTURE(21),
TIMESTAMP_MS_INCORRECT(22),
TIMESTAMP_TOO_SOON(23),
VERSION_INCORRECT(30),
FEATURE_NOT_YET_RELEASED(31),
GENERATING_BALANCE_INCORRECT(40),
@ -207,21 +208,35 @@ public class Block {
}
long timestamp = parentBlock.calcNextBlockTimestamp(version, generatorSignature, generator);
long maximumTimestamp = parentBlock.getBlockData().getTimestamp() + BlockChain.getInstance().getMaxBlockTime();
if (timestamp > maximumTimestamp)
timestamp = maximumTimestamp;
int transactionCount = 0;
byte[] transactionsSignature = null;
int height = parentBlockData.getHeight() + 1;
this.executeATs();
this.transactions = new ArrayList<Transaction>();
int atCount = this.ourAtStates.size();
BigDecimal atFees = this.ourAtFees;
int atCount = 0;
BigDecimal atFees = BigDecimal.ZERO.setScale(8);
BigDecimal totalFees = atFees;
// This instance used for AT processing
this.blockData = new BlockData(version, reference, transactionCount, totalFees, transactionsSignature, height, timestamp, generatingBalance,
generator.getPublicKey(), generatorSignature, atCount, atFees);
this.transactions = new ArrayList<Transaction>();
// Requires this.blockData and this.transactions, sets this.ourAtStates and this.ourAtFees
this.executeATs();
atCount = this.ourAtStates.size();
this.atStates = this.ourAtStates;
atFees = this.ourAtFees;
totalFees = atFees;
// Rebuild blockData using post-AT-execute data
this.blockData = new BlockData(version, reference, transactionCount, totalFees, transactionsSignature, height, timestamp, generatingBalance,
generator.getPublicKey(), generatorSignature, atCount, atFees);
}
// Getters/setters
@ -681,6 +696,10 @@ public class Block {
if (this.blockData.getTimestamp() % 1000 != parentBlockData.getTimestamp() % 1000)
return ValidationResult.TIMESTAMP_MS_INCORRECT;
// Too early to forge block?
if (this.blockData.getTimestamp() < parentBlock.getBlockData().getTimestamp() + BlockChain.getInstance().getMinBlockTime())
return ValidationResult.TIMESTAMP_TOO_SOON;
// Check block version
if (this.blockData.getVersion() != parentBlock.getNextBlockVersion())
return ValidationResult.VERSION_INCORRECT;
@ -691,23 +710,26 @@ public class Block {
if (this.blockData.getGeneratingBalance().compareTo(parentBlock.calcNextBlockGeneratingBalance()) != 0)
return ValidationResult.GENERATING_BALANCE_INCORRECT;
// Check generator is allowed to forge this block at this time
BigInteger hashValue = this.calcBlockHash();
BigInteger target = parentBlock.calcGeneratorsTarget(this.generator);
// After maximum block period, then generator checks are relaxed
if (this.blockData.getTimestamp() < parentBlock.getBlockData().getTimestamp() + BlockChain.getInstance().getMaxBlockTime()) {
// Check generator is allowed to forge this block
BigInteger hashValue = this.calcBlockHash();
BigInteger target = parentBlock.calcGeneratorsTarget(this.generator);
// Multiply target by guesses
long guesses = (this.blockData.getTimestamp() - parentBlockData.getTimestamp()) / 1000;
BigInteger lowerTarget = target.multiply(BigInteger.valueOf(guesses - 1));
target = target.multiply(BigInteger.valueOf(guesses));
// Multiply target by guesses
long guesses = (this.blockData.getTimestamp() - parentBlockData.getTimestamp()) / 1000;
BigInteger lowerTarget = target.multiply(BigInteger.valueOf(guesses - 1));
target = target.multiply(BigInteger.valueOf(guesses));
// Generator's target must exceed block's hashValue threshold
if (hashValue.compareTo(target) >= 0)
return ValidationResult.GENERATOR_NOT_ACCEPTED;
// Generator's target must exceed block's hashValue threshold
if (hashValue.compareTo(target) >= 0)
return ValidationResult.GENERATOR_NOT_ACCEPTED;
// Odd gen1 comment: "CHECK IF FIRST BLOCK OF USER"
// Each second elapsed allows generator to test a new "target" window against hashValue
if (hashValue.compareTo(lowerTarget) < 0)
return ValidationResult.GENERATOR_NOT_ACCEPTED;
// Odd gen1 comment: "CHECK IF FIRST BLOCK OF USER"
// Each second elapsed allows generator to test a new "target" window against hashValue
if (hashValue.compareTo(lowerTarget) < 0)
return ValidationResult.GENERATOR_NOT_ACCEPTED;
}
// CIYAM ATs
if (this.blockData.getATCount() != 0) {
@ -720,6 +742,8 @@ public class Block {
} else {
// Generate local AT states for comparison
this.executeATs();
// XXX do we need to revalidate signatures if transactions list has changed?
}
// Check locally generated AT states against ones received from elsewhere

7
src/qora/block/BlockChain.java
View File

@ -6,7 +6,6 @@ import java.sql.SQLException;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
@ -157,9 +156,9 @@ public class BlockChain {
long maxBytesPerUnitFee = (Long) Settings.getTypedJson(json, "maxBytesPerUnitFee", Long.class);
BigDecimal maxBalance = Settings.getJsonBigDecimal(json, "coinSupply");
int blockDifficultyInterval = ((Long) Settings.getTypedJson(json, "blockDifficultyInterval", Long.class)).intValue();
long minBlockTime = (Long) Settings.getTypedJson(json, "minBlockTime", Long.class);
long maxBlockTime = (Long) Settings.getTypedJson(json, "maxBlockTime", Long.class);
long blockTimestampMargin = (Long) Settings.getTypedJson(json, "blockTimestampMargin", Long.class);
long minBlockTime = 1000L * (Long) Settings.getTypedJson(json, "minBlockTime", Long.class); // config entry in seconds
long maxBlockTime = 1000L * (Long) Settings.getTypedJson(json, "maxBlockTime", Long.class); // config entry in seconds
long blockTimestampMargin = (Long) Settings.getTypedJson(json, "blockTimestampMargin", Long.class); // config entry in milliseconds
// blockchain feature triggers
Map<String, Map<FeatureValueType, Long>> featureTriggers = new HashMap<>();