package cc.mrbird.febs.mall.chain.ercCoin;
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import org.web3j.abi.FunctionEncoder;
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import org.web3j.abi.FunctionReturnDecoder;
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import org.web3j.abi.TypeReference;
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import org.web3j.abi.datatypes.Function;
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import org.web3j.abi.datatypes.Type;
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import org.web3j.abi.datatypes.generated.Uint256;
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import org.web3j.protocol.Web3j;
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import org.web3j.protocol.core.DefaultBlockParameterName;
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import org.web3j.protocol.core.Request;
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import org.web3j.protocol.core.methods.request.Transaction;
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import org.web3j.protocol.core.methods.response.EthBlockNumber;
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import org.web3j.protocol.core.methods.response.EthCall;
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import org.web3j.protocol.http.HttpService;
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import org.web3j.utils.Numeric;
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import java.io.IOException;
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import java.math.BigInteger;
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import java.util.ArrayList;
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import java.util.List;
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public class EthService implements ContractChainService {
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private Web3j web3j;
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private String url;
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private String ownerAddress;
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private String privateKey;
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private String contractAddress;
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public EthService(String url, String address, String privateKey, String contractAddress) {
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this.url = url;
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this.ownerAddress = address;
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this.privateKey = privateKey;
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this.contractAddress = contractAddress;
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HttpService service = new HttpService(url);
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web3j = Web3j.build(service);
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}
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@Override
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public int decimals() {
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try {
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String methodName = "decimals";
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List<Type> inputParameters = new ArrayList<>();
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List<TypeReference<?>> outputParameters = new ArrayList<>();
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TypeReference<Uint256> typeReference = new TypeReference<Uint256>() {
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};
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outputParameters.add(typeReference);
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Function function = new Function(methodName, inputParameters, outputParameters);
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String data = FunctionEncoder.encode(function);
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Transaction transaction = Transaction.createEthCallTransaction(null, contractAddress, data);
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EthCall ethCall;
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BigInteger decimals = BigInteger.ZERO;
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try {
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ethCall = web3j.ethCall(transaction, DefaultBlockParameterName.LATEST).send();
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List<Type> results = FunctionReturnDecoder.decode(ethCall.getValue(), function.getOutputParameters());
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decimals = (BigInteger) results.get(0).getValue();
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return decimals.intValue();
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} catch (IOException e) {
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e.printStackTrace();
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}
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} catch (Exception e) {
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e.printStackTrace();
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}
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return 0;
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}
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@Override
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public BigInteger blockNumber() {
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Request<?, EthBlockNumber> request = web3j.ethBlockNumber();
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EthBlockNumber send = null;
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try {
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send = request.send();
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} catch (IOException e) {
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e.printStackTrace();
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}
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if (send != null) {
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return Numeric.decodeQuantity(send.getResult());
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} else {
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throw new NullPointerException();
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}
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}
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}
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