@Test
public void parseBlock() {
// CREATE EMPTY MEMORY DATABASE
DBSet databaseSet = DBSet.createEmptyDatabaseSet();
// PROCESS GENESISBLOCK
GenesisBlock genesisBlock = new GenesisBlock();
genesisBlock.process(databaseSet);
// CREATE KNOWN ACCOUNT
byte[] seed = Crypto.getInstance().digest("test".getBytes());
byte[] privateKey = Crypto.getInstance().createKeyPair(seed).getA();
PrivateKeyAccount generator = new PrivateKeyAccount(privateKey);
// PROCESS GENESIS TRANSACTION TO MAKE SURE GENERATOR HAS FUNDS
Transaction transaction =
new GenesisTransaction(generator, BigDecimal.valueOf(1000).setScale(8), NTP.getTime());
transaction.process(databaseSet);
// GENERATE NEXT BLOCK
BlockGenerator blockGenerator = new BlockGenerator();
Block block = blockGenerator.generateNextBlock(databaseSet, generator, genesisBlock);
// FORK
DBSet fork = databaseSet.fork();
// GENERATE PAYMENT 1
Account recipient = new Account("XUi2oga2pnGNcZ9es6pBqxydtRZKWdkL2g");
long timestamp = block.getTimestamp();
byte[] signature =
PaymentTransaction.generateSignature(
databaseSet,
generator,
recipient,
BigDecimal.valueOf(100).setScale(8),
BigDecimal.valueOf(1).setScale(8),
timestamp);
Transaction payment1 =
new PaymentTransaction(
generator,
recipient,
BigDecimal.valueOf(100).setScale(8),
BigDecimal.valueOf(1).setScale(8),
timestamp,
generator.getLastReference(databaseSet),
signature);
payment1.process(fork);
block.addTransaction(payment1);
// GENERATE PAYMENT 2
Account recipient2 = new Account("XLPYYfxKEiDcybCkFA7jXcxSdePMMoyZLt");
signature =
PaymentTransaction.generateSignature(
fork,
generator,
recipient2,
BigDecimal.valueOf(100).setScale(8),
BigDecimal.valueOf(1).setScale(8),
timestamp);
Transaction payment2 =
new PaymentTransaction(
generator,
recipient2,
BigDecimal.valueOf(100).setScale(8),
BigDecimal.valueOf(1).setScale(8),
timestamp,
generator.getLastReference(fork),
signature);
block.addTransaction(payment2);
// ADD TRANSACTION SIGNATURE
byte[] transactionsSignature =
Crypto.getInstance().sign(generator, block.getGeneratorSignature());
block.setTransactionsSignature(transactionsSignature);
// CONVERT TO BYTES
byte[] rawBlock = block.toBytes();
try {
// PARSE FROM BYTES
Block parsedBlock = BlockFactory.getInstance().parse(rawBlock);
// CHECK INSTANCE
assertEquals(false, parsedBlock instanceof GenesisBlock);
// CHECK SIGNATURE
assertEquals(true, Arrays.equals(block.getSignature(), parsedBlock.getSignature()));
// CHECK GENERATOR
assertEquals(block.getGenerator().getAddress(), parsedBlock.getGenerator().getAddress());
// CHECK BASE TARGET
assertEquals(block.getGeneratingBalance(), parsedBlock.getGeneratingBalance());
// CHECK FEE
assertEquals(block.getTotalFee(), parsedBlock.getTotalFee());
// CHECK REFERENCE
assertEquals(true, Arrays.equals(block.getReference(), parsedBlock.getReference()));
// CHECK TIMESTAMP
assertEquals(block.getTimestamp(), parsedBlock.getTimestamp());
// CHECK TRANSACTIONS COUNT
assertEquals(block.getTransactionCount(), parsedBlock.getTransactionCount());
} catch (Exception e) {
fail("Exception while parsing transaction.");
}
// PARSE TRANSACTION FROM WRONG BYTES
rawBlock = new byte[50];
try {
// PARSE FROM BYTES
BlockFactory.getInstance().parse(rawBlock);
// FAIL
fail("this should throw an exception");
} catch (Exception e) {
// EXCEPTION IS THROWN OKE
}
}
@Test
public void orphanBlock() {
// CREATE EMPTY MEMORY DATABASE
DBSet databaseSet = DBSet.createEmptyDatabaseSet();
// PROCESS GENESISBLOCK
GenesisBlock genesisBlock = new GenesisBlock();
genesisBlock.process(databaseSet);
// CREATE KNOWN ACCOUNT
byte[] seed = Crypto.getInstance().digest("test".getBytes());
byte[] privateKey = Crypto.getInstance().createKeyPair(seed).getA();
PrivateKeyAccount generator = new PrivateKeyAccount(privateKey);
// PROCESS GENESIS TRANSACTION TO MAKE SURE GENERATOR HAS FUNDS
Transaction transaction =
new GenesisTransaction(generator, BigDecimal.valueOf(1000).setScale(8), NTP.getTime());
transaction.process(databaseSet);
// GENERATE NEXT BLOCK
BlockGenerator blockGenerator = new BlockGenerator();
Block block = blockGenerator.generateNextBlock(databaseSet, generator, genesisBlock);
// FORK
DBSet fork = databaseSet.fork();
// GENERATE PAYMENT 1
Account recipient = new Account("XUi2oga2pnGNcZ9es6pBqxydtRZKWdkL2g");
long timestamp = block.getTimestamp();
byte[] signature =
PaymentTransaction.generateSignature(
databaseSet,
generator,
recipient,
BigDecimal.valueOf(100).setScale(8),
BigDecimal.valueOf(1).setScale(8),
timestamp);
Transaction payment1 =
new PaymentTransaction(
generator,
recipient,
BigDecimal.valueOf(100).setScale(8),
BigDecimal.valueOf(1).setScale(8),
timestamp,
generator.getLastReference(databaseSet),
signature);
payment1.process(fork);
block.addTransaction(payment1);
// GENERATE PAYMENT 2
Account recipient2 = new Account("XLPYYfxKEiDcybCkFA7jXcxSdePMMoyZLt");
signature =
PaymentTransaction.generateSignature(
fork,
generator,
recipient2,
BigDecimal.valueOf(100).setScale(8),
BigDecimal.valueOf(1).setScale(8),
timestamp);
Transaction payment2 =
new PaymentTransaction(
generator,
recipient2,
BigDecimal.valueOf(100).setScale(8),
BigDecimal.valueOf(1).setScale(8),
timestamp,
generator.getLastReference(fork),
signature);
block.addTransaction(payment2);
// ADD TRANSACTION SIGNATURE
byte[] transactionsSignature = blockGenerator.calculateTransactionsSignature(block, generator);
block.setTransactionsSignature(transactionsSignature);
// CHECK VALID
assertEquals(true, block.isSignatureValid());
assertEquals(true, block.isValid(databaseSet));
// PROCESS BLOCK
block.process(databaseSet);
// ORPHAN BLOCK
block.orphan(databaseSet);
// CHECK BALANCE GENERATOR
assertEquals(
true, generator.getConfirmedBalance(databaseSet).compareTo(BigDecimal.valueOf(1000)) == 0);
// CHECK LAST REFERENCE GENERATOR
assertEquals(
true, Arrays.equals(generator.getLastReference(databaseSet), transaction.getSignature()));
// CHECK BALANCE RECIPIENT
assertEquals(
true, recipient.getConfirmedBalance(databaseSet).compareTo(BigDecimal.valueOf(1000)) == 0);
// CHECK LAST REFERENCE RECIPIENT
assertEquals(
false, Arrays.equals(recipient.getLastReference(databaseSet), payment1.getSignature()));
// CHECK BALANCE RECIPIENT2
assertEquals(
true, recipient2.getConfirmedBalance(databaseSet).compareTo(BigDecimal.valueOf(0)) == 0);
// CHECK LAST REFERENCE RECIPIENT
assertEquals(true, Arrays.equals(recipient2.getLastReference(databaseSet), new byte[0]));
// CHECK LAST BLOCK
assertEquals(
true,
Arrays.equals(
genesisBlock.getSignature(), databaseSet.getBlockMap().getLastBlock().getSignature()));
}
public boolean isValid(DBSet db) {
// CHECK IF PARENT EXISTS
if (this.reference == null || this.getParent(db) == null) {
return false;
}
// CHECK IF TIMESTAMP IS VALID -500 MS ERROR MARGIN TIME
if (this.timestamp - 500 > NTP.getTime() || this.timestamp < this.getParent(db).timestamp) {
return false;
}
// CHECK IF TIMESTAMP REST SAME AS PARENT TIMESTAMP REST
if (this.timestamp % 1000 != this.getParent(db).timestamp % 1000) {
return false;
}
// CHECK IF GENERATING BALANCE IS CORRECT
if (this.generatingBalance
!= BlockGenerator.getNextBlockGeneratingBalance(db, this.getParent(db))) {
return false;
}
// CHECK IF VERSION IS CORRECT
if (this.version != this.getParent(db).getNextBlockVersion(db)) {
return false;
}
if (this.version < 2 && (this.atBytes.length > 0 || this.atFees != 0)) {
return false;
}
// CREATE TARGET
byte[] targetBytes = new byte[32];
Arrays.fill(targetBytes, Byte.MAX_VALUE);
BigInteger target = new BigInteger(1, targetBytes);
// DIVIDE TARGET BY BASE TARGET
BigInteger baseTarget =
BigInteger.valueOf(BlockGenerator.getBaseTarget(this.generatingBalance));
target = target.divide(baseTarget);
// MULTIPLY TARGET BY USER BALANCE
target = target.multiply(this.generator.getGeneratingBalance(db).toBigInteger());
// MULTIPLE TARGET BY GUESSES
long guesses = (this.timestamp - this.getParent(db).getTimestamp()) / 1000;
BigInteger lowerTarget = target.multiply(BigInteger.valueOf(guesses - 1));
target = target.multiply(BigInteger.valueOf(guesses));
// CONVERT PROOF HASH TO BIGINT
BigInteger hashValue = new BigInteger(1, getProofHash());
// CHECK IF HASH LOWER THEN TARGET
if (hashValue.compareTo(target) >= 0) {
return false;
}
// CHECK IF FIRST BLOCK OF USER
if (hashValue.compareTo(lowerTarget) < 0) {
return false;
}
if (this.atBytes != null && this.atBytes.length > 0) {
try {
AT_Block atBlock =
AT_Controller.validateATs(
this.getBlockATs(), db.getBlockMap().getLastBlock().getHeight(db) + 1, db);
this.atFees = atBlock.getTotalFees();
} catch (NoSuchAlgorithmException | AT_Exception e) {
e.printStackTrace();
return false;
}
}
// CHECK TRANSACTIONS
DBSet fork = db.fork();
for (Transaction transaction : this.getTransactions()) {
// CHECK IF NOT GENESISTRANSACTION
if (transaction instanceof GenesisTransaction) {
return false;
}
Integer min = 0;
if (db.getBlockMap().getParentList() != null) {
min = AT_API_Platform_Impl.getForkHeight(db);
}
// CHECK IF VALID
if (transaction instanceof DeployATTransaction) {
DeployATTransaction atTx = (DeployATTransaction) transaction;
if (atTx.isValid(fork, min) != Transaction.VALIDATE_OK) {
return false;
}
} else if (transaction.isValid(fork) != Transaction.VALIDATE_OK) {
return false;
}
// CHECK TIMESTAMP AND DEADLINE
if (transaction.getTimestamp() > this.timestamp
|| transaction.getDeadline() <= this.timestamp) {
return false;
}
// PROCESS TRANSACTION IN MEMORYDB TO MAKE SURE OTHER TRANSACTIONS VALIDATE PROPERLY
transaction.process(fork);
}
// BLOCK IS VALID
return true;
}