Package com.academy.stratum.service.impl

Class EthereumServiceImpl

java.lang.Object

com.academy.stratum.service.impl.EthereumServiceImpl

All Implemented Interfaces:

EthereumService

@Service("ethereumService")
public class EthereumServiceImpl
extends java.lang.Object
implements EthereumService

Implementation of EthereumService interface Allows you to interact with Ethereum blockchain

Author:

Ruslan Nazirov

Constructor Summary

Constructors

Constructor	Description
EthereumServiceImpl()

Method Summary

Modifier and Type	Method	Description
EtherlinkerResponseData	createWallet(EtherlinkerRequestData etherlinkerRequestData)	Create a new wallet by using request data
java.util.ArrayList<java.lang.String>	createWallet(java.lang.String path, java.lang.String password)	Create a new wallet in a specified directory
EtherlinkerResponseData	deployContract(EtherlinkerRequestData etherlinkerRequestData)	Deploy contract, which previously was compiled by Web3j into specific wrapper class
EtherlinkerResponseData	enhanceResponseData(EtherlinkerResponseData etherlinkerResponseData, EtherlinkerRequestData etherlinkerRequestData, java.lang.String operationType)	Enhance response data with parameters, which are common for any type of response
EtherlinkerResponseData	execContractMethod(EtherlinkerRequestData etherlinkerRequestData)	Execute custom solidity contract method
static org.bitcoinj.core.ECKey	fromBIP44HDpath(org.bitcoinj.crypto.DeterministicKey masterKey, int accountIndex)
EtherlinkerResponseData	getBalance(EtherlinkerRequestData etherlinkerRequestData)	Get balance of specified wallet from request data
org.web3j.crypto.Credentials	loadCredentials(EtherlinkerRequestData etherlinkerRequestData)	Load wallet credentials by using provided request data
org.web3j.crypto.Credentials	loadWallet(java.lang.String password, java.lang.String path)	Load wallet credentials by using private key, located in selected path with provided password
org.web3j.crypto.Credentials	loadWalletBIP39(java.lang.String password, java.lang.String mnemonic)	Load wallet credentials by using provided password and BIP39 mnemonic
EtherlinkerBatchResponseData	processBatchRequest(EtherlinkerBatchRequestData etherlinkerBatchRequestData)	Execute custom solidity contract method
org.web3j.protocol.admin.Admin	setUp(java.lang.String URL)	Setup Web3j JSON-RPC Request object building factory.
EtherlinkerResponseData	transferEther(EtherlinkerRequestData etherlinkerRequestData)

Methods inherited from class java.lang.Object

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

Constructor Detail

EthereumServiceImpl

public EthereumServiceImpl()

Method Detail

setUp

public org.web3j.protocol.admin.Admin setUp(java.lang.String URL)

Description copied from interface: EthereumService

Setup Web3j JSON-RPC Request object building factory.

Specified by:

setUp in interface EthereumService

Parameters:

URL - access URL from Infura (https://infura.io/)

Returns:

Admin Web3j JSON-RPC Request object building factory

transferEther

public EtherlinkerResponseData transferEther(EtherlinkerRequestData etherlinkerRequestData)
                                      throws java.lang.Exception

Specified by:

transferEther in interface EthereumService

Parameters:

etherlinkerRequestData - request data from compatible application (like UE4)

Returns:

EtherlinkerResponseData with transaction result

Throws:

java.lang.Exception - any exception, which happened during method execution

getBalance

public EtherlinkerResponseData getBalance(EtherlinkerRequestData etherlinkerRequestData)
                                   throws java.lang.Exception

Description copied from interface: EthereumService

Get balance of specified wallet from request data

Specified by:

getBalance in interface EthereumService

Parameters:

etherlinkerRequestData - request data from compatible application (like UE4)

Returns:

EtherlinkerResponseData response data with a wallet balance

Throws:

java.lang.Exception - any exception, which happened during method execution

deployContract

public EtherlinkerResponseData deployContract(EtherlinkerRequestData etherlinkerRequestData)
                                       throws java.lang.Exception

Description copied from interface: EthereumService

Deploy contract, which previously was compiled by Web3j into specific wrapper class

Specified by:

deployContract in interface EthereumService

Parameters:

etherlinkerRequestData - request data from compatible application (like UE4)

Returns:

EtherlinkerResponseData response data with a transaction result

Throws:

java.lang.Exception - any exception, which happened during method execution

execContractMethod

public EtherlinkerResponseData execContractMethod(EtherlinkerRequestData etherlinkerRequestData)
                                           throws java.lang.Exception

Description copied from interface: EthereumService

Execute custom solidity contract method

Specified by:

execContractMethod in interface EthereumService

Parameters:

etherlinkerRequestData - request data from compatible application (like UE4)

Returns:

EtherlinkerResponseData response data with a result of method execution

Throws:

java.lang.Exception - any exception, which happened during method execution

processBatchRequest

public EtherlinkerBatchResponseData processBatchRequest(EtherlinkerBatchRequestData etherlinkerBatchRequestData)
                                                 throws java.lang.Exception

Description copied from interface: EthereumService

Execute custom solidity contract method

Specified by:

processBatchRequest in interface EthereumService

Parameters:

etherlinkerBatchRequestData - batch request data from compatible application (like UE4)

Returns:

EtherlinkerBatchResponseData batch response data with a results of method execution

Throws:

java.lang.Exception - any exception, which happened during method execution

createWallet

public java.util.ArrayList<java.lang.String> createWallet(java.lang.String path,
                                                          java.lang.String password)
                                                   throws java.lang.Exception

Description copied from interface: EthereumService

Create a new wallet in a specified directory

Specified by:

createWallet in interface EthereumService

Parameters:

path - Path to the directory, where you want to the private key

password - Wallet password

Returns:

Wallet filename[0], mnemonic[1] inside of ArrayList

Throws:

java.lang.Exception - any exception, which happened during method execution

createWallet

public EtherlinkerResponseData createWallet(EtherlinkerRequestData etherlinkerRequestData)
                                     throws java.lang.Exception

Description copied from interface: EthereumService

Create a new wallet by using request data

Specified by:

createWallet in interface EthereumService

Parameters:

etherlinkerRequestData - request data from compatible application (like UE4)

Returns:

EtherlinkerResponseData response data with a result of method execution

Throws:

java.lang.Exception - any exception, which happened during method execution

loadWallet

public org.web3j.crypto.Credentials loadWallet(java.lang.String password,
                                               java.lang.String path)
                                        throws java.lang.Exception

Description copied from interface: EthereumService

Load wallet credentials by using private key, located in selected path with provided password

Specified by:

loadWallet in interface EthereumService

Parameters:

password - Wallet password

path - File system path to the private key

Returns:

Wallet Credentials to use in requests to the blockchain

Throws:

java.lang.Exception - any exception, which happened during method execution

loadWalletBIP39

public org.web3j.crypto.Credentials loadWalletBIP39(java.lang.String password,
                                                    java.lang.String mnemonic)
                                             throws java.lang.Exception

Description copied from interface: EthereumService

Load wallet credentials by using provided password and BIP39 mnemonic

Specified by:

loadWalletBIP39 in interface EthereumService

Parameters:

password - Wallet password

mnemonic - Wallet mnemonic

Returns:

Wallet Credentials to use in requests to the blockchain

Throws:

java.lang.Exception - any exception, which happened during method execution

fromBIP44HDpath

public static org.bitcoinj.core.ECKey fromBIP44HDpath(org.bitcoinj.crypto.DeterministicKey masterKey,
                                                      int accountIndex)

enhanceResponseData

public EtherlinkerResponseData enhanceResponseData(EtherlinkerResponseData etherlinkerResponseData,
                                                   EtherlinkerRequestData etherlinkerRequestData,
                                                   java.lang.String operationType)

Description copied from interface: EthereumService

Enhance response data with parameters, which are common for any type of response

Specified by:

enhanceResponseData in interface EthereumService

Parameters:

etherlinkerResponseData - half-populated response data to enhance

etherlinkerRequestData - request data from compatible application (like UE4)

operationType - Operation type, which was used during method execution (like "createWallet" or "deployContract")

Returns:

EtherlinkerResponseData enhanced response data

loadCredentials

public org.web3j.crypto.Credentials loadCredentials(EtherlinkerRequestData etherlinkerRequestData)
                                             throws java.lang.Exception

Description copied from interface: EthereumService

Load wallet credentials by using provided request data

Specified by:

loadCredentials in interface EthereumService

Parameters:

etherlinkerRequestData - request data from compatible application (like UE4)

Returns:

Wallet Credentials to use in requests to the blockchain

Throws:

java.lang.Exception - any exception, which happened during method execution