Package org.exoplatform.wallet.blockchain.service

Class EthereumClientConnector

java.lang.Object

org.exoplatform.wallet.blockchain.service.EthereumClientConnector

All Implemented Interfaces:

org.exoplatform.wallet.statistic.ExoWalletStatisticService, org.picocontainer.Startable

public class EthereumClientConnector
extends Object
implements org.exoplatform.wallet.statistic.ExoWalletStatisticService, org.picocontainer.Startable

A Web3j connector class to interact with Ethereum Blockchain

Constructor Summary

Constructors

Constructor	Description
EthereumClientConnector()

Method Summary

Modifier and Type	Method	Description
Set<String>	getContractTransactions(String contractsAddress, long fromBlock, long toBlock)	Retrieve from blockchain transaction hashes from contract starting from a block number to a block number
BigInteger	getGasPrice()
long	getLastestBlockNumber()
BigInteger	getNonce(String walletAddress, org.web3j.protocol.core.DefaultBlockParameterName blockParameterName)	Retruns nonce corresponding for a given wallet address: * if using DefaultBlockParameterName.LATEST, this will return last mined transaction nonce * if using DefaultBlockParameterName.PENDING, this will return last pending transaction nonce that can be used to compute next pending transaction nonce
long	getPoolingInterval()
Map<String,Object>	getStatisticParameters(String statisticType, Object result, Object... methodArgs)
org.web3j.protocol.core.methods.response.Transaction	getTransaction(String transactionHash)	Get transaction by hash
org.web3j.protocol.core.methods.response.TransactionReceipt	getTransactionReceipt(String transactionHash)	Get transaction receipt by hash
org.web3j.protocol.Web3j	getWeb3j()
boolean	isListeningToBlockchain()
boolean	isPermanentlyScanBlockchain()
void	renewBlockSubscription(long lastWatchedBlockNumber)
CompletableFuture<org.web3j.protocol.core.methods.response.EthSendTransaction>	sendTransactionToBlockchain(org.exoplatform.wallet.model.transaction.TransactionDetail transactionDetail)	Send raw transaction specified in Transaction detail
void	setPoolingInterval(long poolingInterval)
void	start()
void	start(boolean blocking)
void	startListeningBlockchain()
void	stop()
void	stopListeningToBlockchain()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

EthereumClientConnector

public EthereumClientConnector()

Method Detail

start

public void start()

Specified by:

start in interface org.picocontainer.Startable

start

public void start(boolean blocking)

stop

public void stop()

Specified by:

stop in interface org.picocontainer.Startable

startListeningBlockchain

public void startListeningBlockchain()

stopListeningToBlockchain

public void stopListeningToBlockchain()

isPermanentlyScanBlockchain

public boolean isPermanentlyScanBlockchain()

isListeningToBlockchain

public boolean isListeningToBlockchain()

getTransaction

public org.web3j.protocol.core.methods.response.Transaction getTransaction(String transactionHash)

Get transaction by hash

Parameters:

transactionHash - transaction hash to retrieve

Returns:

Web3j Transaction object

getTransactionReceipt

public org.web3j.protocol.core.methods.response.TransactionReceipt getTransactionReceipt(String transactionHash)

Get transaction receipt by hash

Parameters:

transactionHash - transaction hash to retrieve

Returns:

Web3j Transaction receipt object

getLastestBlockNumber

public long getLastestBlockNumber()
                           throws IOException

Returns:

last mined block number from blockchain

Throws:

IOException - when error sending transaction on blockchain

getContractTransactions

public Set<String> getContractTransactions(String contractsAddress,
                                           long fromBlock,
                                           long toBlock)
                                    throws IOException

Retrieve from blockchain transaction hashes from contract starting from a block number to a block number

Parameters:

contractsAddress - blockchain contract address

fromBlock - search starting from this block number

toBlock - search until this block number

Returns:

a Set of transaction hashes

Throws:

IOException - if an error happens while getting information from blockchain

sendTransactionToBlockchain

public CompletableFuture<org.web3j.protocol.core.methods.response.EthSendTransaction> sendTransactionToBlockchain(org.exoplatform.wallet.model.transaction.TransactionDetail transactionDetail)
                                                                                                           throws IOException

Send raw transaction specified in Transaction detail

Parameters:

transactionDetail - TransactionDetail having rawTransaction to send to blockchain

Returns:

CompletableFuture for transaction sent asynchronously to blockchain

Throws:

IOException - if an error occurs while sending transaction to blockchain

getNonce

public BigInteger getNonce(String walletAddress,
                           org.web3j.protocol.core.DefaultBlockParameterName blockParameterName)
                    throws IOException

Retruns nonce corresponding for a given wallet address: * if using DefaultBlockParameterName.LATEST, this will return last mined transaction nonce * if using DefaultBlockParameterName.PENDING, this will return last pending transaction nonce that can be used to compute next pending transaction nonce

Parameters:

walletAddress - wallet adres to determine its next nonce

blockParameterName - DefaultBlockParameterName value

Returns:

next transaction nonce

Throws:

IOException - if an I/O problem happens when connecting to blockchain

getGasPrice

public BigInteger getGasPrice()
                       throws IOException

Returns:

current

Throws:

IOException - if an error occurs while sending transaction to blockchain

getWeb3j

public org.web3j.protocol.Web3j getWeb3j()

getStatisticParameters

public Map<String,Object> getStatisticParameters(String statisticType,
                                                       Object result,
                                                       Object... methodArgs)

Specified by:

getStatisticParameters in interface org.exoplatform.wallet.statistic.ExoWalletStatisticService

renewBlockSubscription

public void renewBlockSubscription(long lastWatchedBlockNumber)
                            throws IOException

Throws:

IOException

setPoolingInterval

public void setPoolingInterval(long poolingInterval)

getPoolingInterval

public long getPoolingInterval()