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2019232

2022-12-13 6ee179161f95fed832927a2a33a4d9f05a2dcf80

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package cc.mrbird.febs.dapp.contract;
 
import org.springframework.stereotype.Component;
import org.web3j.crypto.Credentials;
import org.web3j.protocol.Web3j;
import org.web3j.protocol.core.DefaultBlockParameterName;
import org.web3j.protocol.core.DefaultBlockParameterNumber;
import org.web3j.protocol.core.methods.request.EthFilter;
import org.web3j.protocol.core.methods.response.TransactionReceipt;
import org.web3j.protocol.http.HttpService;
import org.web3j.tx.gas.DefaultGasProvider;
import org.web3j.tx.gas.StaticGasProvider;
 
import java.math.BigInteger;
 
 
@Component
public class ContractMain {
    private static Web3j web3;
 
    private static Web3j getInstance() {
        if (web3 == null) {
            HttpService httpService = new HttpService(blockchainNode);
            web3 = Web3j.build(httpService);
        }
        return web3;
    }
 
    // gas费用单价
    public static final BigInteger GAS_PRICE = BigInteger.valueOf(32000000000L);
    // gas费用最大值
    public static final BigInteger GAS_LIMIT = BigInteger.valueOf(4300000L);
    private static StaticGasProvider getStaticGasProvider(){
        return new StaticGasProvider(GAS_PRICE,GAS_LIMIT);
    }
 
    private static Web3j getInstanceScope() {
 
        HttpService httpService = new HttpService(blockchainNode);
        return Web3j.build(httpService);
    }
 
    // 区块链节点地址 TODO
    private static String blockchainNode = "http://120.55.86.146:8545";
 
    // 合约地址 TODO
    private static String contractAddr = "0x62bd82b966a00207c2a706d3b395c4f0523711c6";
 
    // 操作账号 合约创建者的私钥 用于操作合约内方法 TODO
    private static String privateKey = "";
 
    private EthFilter getFilter(BigInteger startBlock) {
        if (startBlock != null) {
            EthFilter filter = new EthFilter(new DefaultBlockParameterNumber(startBlock),
                    DefaultBlockParameterName.LATEST, contractAddr);
            return filter;
        } else {
            return new EthFilter(DefaultBlockParameterName.EARLIEST,
                    DefaultBlockParameterName.LATEST, contractAddr);
        }
    }
 
 
    /**
     * 监听投注 参数是起始的区块值
     */
    public void listenBetting(BigInteger startBlock){
        System.out.println("启动投注监听事件");
        // 指定密钥文件并进行账号和密码的验证
        Credentials credentials = Credentials.create(privateKey);
        Abi contract = Abi.load(contractAddr, getInstanceScope(), credentials, new DefaultGasProvider());
        EthFilter filter = getFilter(startBlock);
        contract.bettingEventFlowable(filter).subscribe(e->{
            // 投注时填的注册码
            String regCode = e.regCode;
            // 投注人的地址
            String from = e.from;
            // TODO 业务操作逻辑代码
        });
    }
 
    /**
     * 从合约内转币到制定地址
     */
    public void trans(BigInteger amount, String to1){
        Credentials credentials = Credentials.create(privateKey);
        Abi contract = Abi.load(contractAddr, getInstance(), credentials, getStaticGasProvider());
        try {
            TransactionReceipt send = contract.trans(amount, to1).send();
        } catch (Exception exception) {
            exception.printStackTrace();
        }
    }
}