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Java implementation of the Ethereum protocol adapted to use for Hedera Smart Contract Service
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/*
* Copyright (c) [2016] [ ]
* This file is part of the ethereumJ library.
*
* The ethereumJ library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* The ethereumJ library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the ethereumJ library. If not, see stateDS;
JournalSource pruningStateDS;
PruneManager pruneManager;
private BlockSummary lastSummary;
private VMHook vmHook = VMHook.EMPTY;
class PendingTx {
ECKey sender;
byte[] toAddress;
BigInteger value;
byte[] data;
SolidityContractImpl createdContract;
SolidityContractImpl targetContract;
Transaction customTx;
TransactionResult txResult = new TransactionResult();
public PendingTx(byte[] toAddress, BigInteger value, byte[] data) {
this.sender = txSender;
this.toAddress = toAddress;
this.value = value;
this.data = data;
}
public PendingTx(byte[] toAddress, BigInteger value, byte[] data,
SolidityContractImpl createdContract, SolidityContractImpl targetContract, TransactionResult res) {
this.sender = txSender;
this.toAddress = toAddress;
this.value = value;
this.data = data;
this.createdContract = createdContract;
this.targetContract = targetContract;
this.txResult = res;
}
public PendingTx(Transaction customTx) {
this.customTx = customTx;
}
}
List submittedTxes = new CopyOnWriteArrayList<>();
public StandaloneBlockchain() {
Genesis genesis = GenesisLoader.loadGenesis(
getClass().getResourceAsStream("/genesis/genesis-light-sb.json"));
withGenesis(genesis);
withGasPrice(50_000_000_000L);
withGasLimit(5_000_000L);
withMinerCoinbase(Hex.decode("ffffffffffffffffffffffffffffffffffffffff"));
setSender(ECKey.fromPrivate(Hex.decode("3ec771c31cac8c0dba77a69e503765701d3c2bb62435888d4ffa38fed60c445c")));
// withAccountBalance(txSender.getAddress(), new BigInteger("100000000000000000000000000"));
}
public StandaloneBlockchain withGenesis(Genesis genesis) {
this.genesis = genesis;
return this;
}
public StandaloneBlockchain withMinerCoinbase(byte[] coinbase) {
this.coinbase = coinbase;
return this;
}
public StandaloneBlockchain withNetConfig(BlockchainNetConfig netConfig) {
this.netConfig = netConfig;
return this;
}
public StandaloneBlockchain withAccountBalance(byte[] address, BigInteger weis) {
AccountState state = new AccountState(BigInteger.ZERO, weis);
genesis.addPremine(wrap(address), state);
genesis.setStateRoot(GenesisLoader.generateRootHash(genesis.getPremine()));
return this;
}
public StandaloneBlockchain withGasPrice(long gasPrice) {
this.gasPrice = gasPrice;
return this;
}
public StandaloneBlockchain withGasLimit(long gasLimit) {
this.gasLimit = gasLimit;
return this;
}
public StandaloneBlockchain withAutoblock(boolean autoblock) {
this.autoBlock = autoblock;
return this;
}
public StandaloneBlockchain withCurrentTime(Date date) {
this.time = date.getTime() / 1000;
return this;
}
/**
* [-100, 100]
* 0 - the same block gas limit as parent
* 100 - max available increase from parent gas limit
* -100 - max available decrease from parent gas limit
*/
public StandaloneBlockchain withBlockGasIncrease(int blockGasIncreasePercent) {
this.blockGasIncreasePercent = blockGasIncreasePercent;
return this;
}
public StandaloneBlockchain withDbDelay(long dbDelay) {
this.dbDelay = dbDelay;
return this;
}
public StandaloneBlockchain withVmHook(VMHook vmHook) {
this.vmHook = vmHook;
return this;
}
private Map createTransactions(Block parent) {
Map txes = new LinkedHashMap<>();
Map nonces = new HashMap<>();
Repository repoSnapshot = getBlockchain().getRepository().getSnapshotTo(parent.getStateRoot());
for (PendingTx tx : submittedTxes) {
Transaction transaction;
if (tx.customTx == null) {
ByteArrayWrapper senderW = new ByteArrayWrapper(tx.sender.getAddress());
Long nonce = nonces.get(senderW);
if (nonce == null) {
BigInteger bcNonce = repoSnapshot.getNonce(tx.sender.getAddress());
nonce = bcNonce.longValue();
}
nonces.put(senderW, nonce + 1);
byte[] toAddress = tx.targetContract != null ? tx.targetContract.getAddress() : tx.toAddress;
transaction = createTransaction(tx.sender, nonce, toAddress, tx.value, tx.data);
if (tx.createdContract != null) {
tx.createdContract.setAddress(transaction.getContractAddress());
}
} else {
transaction = tx.customTx;
}
txes.put(tx, transaction);
}
return txes;
}
public PendingStateImpl getPendingState() {
return pendingState;
}
public void generatePendingTransactions() {
pendingState.addPendingTransactions(new ArrayList<>(createTransactions(getBlockchain().getBestBlock()).values()));
}
@Override
public Block createBlock() {
return createForkBlock(getBlockchain().getBestBlock());
}
@Override
public Block createForkBlock(Block parent) {
try {
Map txes = createTransactions(parent);
time += timeIncrement;
Block b = getBlockchain().createNewBlock(parent, new ArrayList<>(txes.values()), Collections.EMPTY_LIST, time);
int GAS_LIMIT_BOUND_DIVISOR = SystemProperties.getDefault().getBlockchainConfig().
getCommonConstants().getGAS_LIMIT_BOUND_DIVISOR();
BigInteger newGas = ByteUtil.bytesToBigInteger(parent.getGasLimit())
.multiply(BigInteger.valueOf(GAS_LIMIT_BOUND_DIVISOR * 100 + blockGasIncreasePercent))
.divide(BigInteger.valueOf(GAS_LIMIT_BOUND_DIVISOR * 100));
b.getHeader().setGasLimit(ByteUtil.bigIntegerToBytes(newGas));
Ethash.getForBlock(SystemProperties.getDefault(), b.getNumber()).mineLight(b).get();
ImportResult importResult = getBlockchain().tryToConnect(b);
if (importResult != ImportResult.IMPORTED_BEST && importResult != ImportResult.IMPORTED_NOT_BEST) {
throw new RuntimeException("Invalid block import result " + importResult + " for block " + b);
}
List pendingTxes = new ArrayList<>(txes.keySet());
for (int i = 0; i < lastSummary.getReceipts().size(); i++) {
pendingTxes.get(i).txResult.receipt = lastSummary.getReceipts().get(i);
pendingTxes.get(i).txResult.executionSummary = getTxSummary(lastSummary, i);
}
submittedTxes.clear();
return b;
} catch (InterruptedException|ExecutionException e) {
throw new RuntimeException(e);
}
}
private TransactionExecutionSummary getTxSummary(BlockSummary bs, int idx) {
TransactionReceipt txReceipt = bs.getReceipts().get(idx);
for (TransactionExecutionSummary summary : bs.getSummaries()) {
if (FastByteComparisons.equal(txReceipt.getTransaction().getHash(), summary.getTransaction().getHash())) {
return summary;
}
}
return null;
}
public Transaction createTransaction(long nonce, byte[] toAddress, long value, byte[] data) {
return createTransaction(getSender(), nonce, toAddress, BigInteger.valueOf(value), data);
}
public Transaction createTransaction(ECKey sender, long nonce, byte[] toAddress, BigInteger value, byte[] data) {
Transaction transaction = new Transaction(ByteUtil.longToBytesNoLeadZeroes(nonce),
ByteUtil.longToBytesNoLeadZeroes(gasPrice),
ByteUtil.longToBytesNoLeadZeroes(gasLimit),
toAddress, ByteUtil.bigIntegerToBytes(value),
data,
null);
transaction.sign(sender);
return transaction;
}
public void resetSubmittedTransactions() {
submittedTxes.clear();
}
@Override
public void setSender(ECKey senderPrivateKey) {
txSender = senderPrivateKey;
// if (!getBlockchain().getRepository().isExist(senderPrivateKey.getAddress())) {
// Repository repository = getBlockchain().getRepository();
// Repository track = repository.startTracking();
// track.createAccount(senderPrivateKey.getAddress());
// track.commit();
// }
}
public ECKey getSender() {
return txSender;
}
@Override
public void sendEther(byte[] toAddress, BigInteger weis) {
submitNewTx(new PendingTx(toAddress, weis, new byte[0]));
}
public void submitTransaction(Transaction tx) {
submitNewTx(new PendingTx(tx));
}
@Override
public SolidityContract submitNewContract(String soliditySrc, Object... constructorArgs) {
return submitNewContract(soliditySrc, null, constructorArgs);
}
@Override
public SolidityContract submitNewContract(String soliditySrc, String contractName, Object... constructorArgs) {
SolidityContractImpl contract = createContract(soliditySrc, contractName);
return submitNewContract(contract, constructorArgs);
}
@Override
public SolidityContract submitNewContractFromJson(String json, Object... constructorArgs) {
return submitNewContractFromJson(json, null, constructorArgs);
}
@Override
public SolidityContract submitNewContractFromJson(String json, String contractName, Object... constructorArgs) {
SolidityContractImpl contract;
try {
contract = createContractFromJson(contractName, json);
return submitNewContract(contract, constructorArgs);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
@Override
public SolidityContract submitNewContract(ContractMetadata contractMetaData, Object... constructorArgs) {
SolidityContractImpl contract = createContract(contractMetaData);
return submitNewContract(contract, constructorArgs);
}
private SolidityContract submitNewContract(SolidityContractImpl contract, Object... constructorArgs) {
CallTransaction.Function constructor = contract.contract.getConstructor();
if (constructor == null && constructorArgs.length > 0) {
throw new RuntimeException("No constructor with params found");
}
byte[] argsEncoded = constructor == null ? new byte[0] : constructor.encodeArguments(constructorArgs);
submitNewTx(new PendingTx(new byte[0], BigInteger.ZERO,
ByteUtil.merge(Hex.decode(contract.getBinary()), argsEncoded), contract, null,
new TransactionResult()));
return contract;
}
private SolidityContractImpl createContract(String soliditySrc, String contractName) {
try {
SolidityCompiler.Result compileRes = SolidityCompiler.compile(soliditySrc.getBytes(), true, SolidityCompiler.Options.ABI, SolidityCompiler.Options.BIN);
if (compileRes.isFailed()) throw new RuntimeException("Compile result: " + compileRes.errors);
return createContractFromJson(contractName, compileRes.output);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
private SolidityContractImpl createContractFromJson(String contractName, String json) throws IOException {
CompilationResult result = CompilationResult.parse(json);
if (contractName == null) {
contractName = result.getContractName();
}
return createContract(contractName, result);
}
/**
* @param contractName
* @param result
* @return
*/
private SolidityContractImpl createContract(String contractName, CompilationResult result) {
ContractMetadata cMetaData = result.getContract(contractName);
SolidityContractImpl contract = new SolidityContractImpl(cMetaData);
for (CompilationResult.ContractMetadata metadata : result.getContracts()) {
contract.addRelatedContract(metadata.abi);
}
return contract;
}
private SolidityContractImpl createContract(ContractMetadata contractData) {
SolidityContractImpl contract = new SolidityContractImpl(contractData);
contract.addRelatedContract(contractData.abi);
return contract;
}
@Override
public SolidityContract createExistingContractFromSrc(String soliditySrc, String contractName, byte[] contractAddress) {
SolidityContractImpl contract = createContract(soliditySrc, contractName);
contract.setAddress(contractAddress);
return contract;
}
@Override
public SolidityContract createExistingContractFromSrc(String soliditySrc, byte[] contractAddress) {
return createExistingContractFromSrc(soliditySrc, null, contractAddress);
}
@Override
public SolidityContract createExistingContractFromABI(String ABI, byte[] contractAddress) {
SolidityContractImpl contract = new SolidityContractImpl(ABI);
contract.setAddress(contractAddress);
return contract;
}
@Override
public BlockchainImpl getBlockchain() {
if (blockchain == null) {
blockchain = createBlockchain(genesis);
blockchain.setMinerCoinbase(coinbase);
addEthereumListener(new EthereumListenerAdapter() {
@Override
public void onBlock(BlockSummary blockSummary) {
lastSummary = blockSummary;
}
});
}
return blockchain;
}
public void addEthereumListener(EthereumListener listener) {
getBlockchain();
this.listener.addListener(listener);
}
private void submitNewTx(PendingTx tx) {
getBlockchain();
submittedTxes.add(tx);
if (autoBlock) {
createBlock();
}
}
public HashMapDB getStateDS() {
return stateDS;
}
public Source getPruningStateDS() {
return pruningStateDS;
}
public long getTotalDbHits() {
return totalDbHits;
}
private BlockchainImpl createBlockchain(Genesis genesis) {
SystemProperties.getDefault().setBlockchainConfig(netConfig != null ? netConfig : getEasyMiningConfig());
IndexedBlockStore blockStore = new IndexedBlockStore();
blockStore.init(new HashMapDB(), new HashMapDB());
stateDS = new HashMapDB<>();
pruningStateDS = new JournalSource<>(stateDS);
pruneManager = new PruneManager(blockStore, pruningStateDS,
stateDS, SystemProperties.getDefault().databasePruneDepth());
final RepositoryRoot repository = new RepositoryRoot(pruningStateDS);
ProgramInvokeFactoryImpl programInvokeFactory = new ProgramInvokeFactoryImpl();
listener = new CompositeEthereumListener();
BlockchainImpl blockchain = new BlockchainImpl(blockStore, repository)
.withEthereumListener(listener)
.withSyncManager(new SyncManager())
.withVmHook(vmHook);
blockchain.setParentHeaderValidator(new DependentBlockHeaderRuleAdapter());
blockchain.setProgramInvokeFactory(programInvokeFactory);
blockchain.setPruneManager(pruneManager);
blockchain.byTest = true;
pendingState = new PendingStateImpl(listener);
pendingState.setBlockchain(blockchain);
blockchain.setPendingState(pendingState);
Genesis.populateRepository(repository, genesis);
repository.commit();
blockStore.saveBlock(genesis, genesis.getDifficultyBI(), true);
blockchain.setBestBlock(genesis);
blockchain.setTotalDifficulty(genesis.getDifficultyBI());
pruneManager.blockCommitted(genesis.getHeader());
return blockchain;
}
public class SolidityFunctionImpl implements SolidityFunction {
SolidityContractImpl contract;
CallTransaction.Function abi;
public SolidityFunctionImpl(SolidityContractImpl contract, CallTransaction.Function abi) {
this.contract = contract;
this.abi = abi;
}
@Override
public SolidityContract getContract() {
return contract;
}
@Override
public CallTransaction.Function getInterface() {
return abi;
}
}
public class SolidityContractImpl implements SolidityContract {
byte[] address;
public CompilationResult.ContractMetadata compiled;
public CallTransaction.Contract contract;
public List relatedContracts = new ArrayList<>();
public SolidityContractImpl(String abi) {
contract = new CallTransaction.Contract(abi);
}
public SolidityContractImpl(CompilationResult.ContractMetadata result) {
this(result.abi);
compiled = result;
}
public void addRelatedContract(String abi) {
CallTransaction.Contract c = new CallTransaction.Contract(abi);
relatedContracts.add(c);
}
void setAddress(byte[] address) {
this.address = address;
}
@Override
public byte[] getAddress() {
if (address == null) {
throw new RuntimeException("Contract address will be assigned only after block inclusion. Call createBlock() first.");
}
return address;
}
@Override
public SolidityCallResult callFunction(String functionName, Object... args) {
return callFunction(0, functionName, args);
}
@Override
public SolidityCallResult callFunction(BigInteger value, String functionName, Object... args) {
CallTransaction.Function function = contract.getByName(functionName);
byte[] data = function.encode(convertArgs(args));
SolidityCallResult res = new SolidityCallResultImpl(this, function);
submitNewTx(new PendingTx(null, value, data, null, this, res));
return res;
}
@Override
public Object[] callConstFunction(String functionName, Object... args) {
return callConstFunction(getBlockchain().getBestBlock(), functionName, args);
}
@Override
public Object[] callConstFunction(Block callBlock, String functionName, Object... args) {
CallTransaction.Function func = contract.getByName(functionName);
if (func == null) throw new RuntimeException("No function with name '" + functionName + "'");
Transaction tx = CallTransaction.createCallTransaction(0, 0, 100000000000000L,
Hex.toHexString(getAddress()), 0, func, convertArgs(args));
tx.sign(ECKey.DUMMY);
Repository repository = getBlockchain().getRepository().getSnapshotTo(callBlock.getStateRoot()).startTracking();
try {
org.ethereum.core.TransactionExecutor executor = new org.ethereum.core.TransactionExecutor
(tx, callBlock.getCoinbase(), repository, getBlockchain().getBlockStore(),
getBlockchain().getProgramInvokeFactory(), callBlock)
.setLocalCall(true);
executor.init();
executor.execute();
executor.go();
executor.finalization();
return func.decodeResult(executor.getResult().getHReturn());
} finally {
repository.rollback();
}
}
private Object[] convertArgs(Object[] args) {
Object[] ret = new Object[args.length];
for (int i = 0; i < args.length; i++) {
if (args[i] instanceof SolidityFunction) {
SolidityFunction f = (SolidityFunction) args[i];
ret[i] = ByteUtil.merge(f.getContract().getAddress(), f.getInterface().encodeSignature());
} else {
ret[i] = args[i];
}
}
return ret;
}
@Override
public SolidityStorage getStorage() {
return new SolidityStorageImpl(getAddress());
}
@Override
public String getABI() {
return compiled.abi;
}
@Override
public String getBinary() {
return compiled.bin;
}
@Override
public void call(byte[] callData) {
// for this we need cleaner separation of EasyBlockchain to
// Abstract and Solidity specific
throw new UnsupportedOperationException();
}
@Override
public SolidityFunction getFunction(String name) {
return new SolidityFunctionImpl(this, contract.getByName(name));
}
}
public class SolidityCallResultImpl extends SolidityCallResult {
SolidityContractImpl contract;
CallTransaction.Function function;
SolidityCallResultImpl(SolidityContractImpl contract, CallTransaction.Function function) {
this.contract = contract;
this.function = function;
}
@Override
public CallTransaction.Function getFunction() {
return function;
}
public List getEvents() {
List ret = new ArrayList<>();
for (LogInfo logInfo : getReceipt().getLogInfoList()) {
for (CallTransaction.Contract c : contract.relatedContracts) {
CallTransaction.Invocation event = c.parseEvent(logInfo);
if (event != null) {
ret.add(event);
break;
}
}
}
return ret;
}
@Override
public String toString() {
String ret = "SolidityCallResult{" +
function + ": " +
(isIncluded() ? "EXECUTED" : "PENDING") + ", ";
if (isIncluded()) {
ret += isSuccessful() ? "SUCCESS" : ("ERR (" + getReceipt().getError() + ")");
ret += ", ";
if (isSuccessful()) {
ret += "Ret: " + Arrays.toString(getReturnValues()) + ", ";
ret += "Events: " + getEvents() + ", ";
}
}
return ret + "}";
}
}
class SolidityStorageImpl implements SolidityStorage {
byte[] contractAddr;
public SolidityStorageImpl(byte[] contractAddr) {
this.contractAddr = contractAddr;
}
@Override
public byte[] getStorageSlot(long slot) {
return getStorageSlot(DataWord.of(slot).getData());
}
@Override
public byte[] getStorageSlot(byte[] slot) {
DataWord ret = getBlockchain().getRepository().getContractDetails(contractAddr).get(DataWord.of(slot));
return ret.getData();
}
}
class SlowHashMapDB extends HashMapDB {
private void sleep(int cnt) {
totalDbHits += cnt;
if (dbDelay == 0) return;
try {
Thread.sleep(dbDelay * cnt);
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
}
@Override
public synchronized void delete(byte[] arg0) throws DBException {
super.delete(arg0);
sleep(1);
}
@Override
public synchronized byte[] get(byte[] arg0) throws DBException {
sleep(1);
return super.get(arg0);
}
@Override
public synchronized void put(byte[] key, byte[] value) throws DBException {
sleep(1);
super.put(key, value);
}
@Override
public synchronized void updateBatch(Map rows) {
sleep(rows.size() / 2);
super.updateBatch(rows);
}
}
// Override blockchain net config for fast mining
public static PetersburgConfig getEasyMiningConfig() {
return new PetersburgConfig(new DaoNoHFConfig(new HomesteadConfig(new HomesteadConfig.HomesteadConstants() {
@Override
public BigInteger getMINIMUM_DIFFICULTY() {
return BigInteger.ONE;
}
}), 0));
}
}