content: /*
   * Copyright 2024 Ant Group
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.alipay.antchain.bridge.plugins.ethereum2.helper;
  
  import cn.hutool.core.util.StrUtil;
  import lombok.AllArgsConstructor;
  import lombok.Builder;
  import lombok.SneakyThrows;
  import org.web3j.protocol.Web3j;
  import org.web3j.protocol.core.methods.request.Transaction;
  import org.web3j.protocol.core.methods.response.EthEstimateGas;
  
  import java.math.BigInteger;
  
  @AllArgsConstructor
  @Builder
  public class EstimateGasLimitProvider implements IGasLimitProvider {
  
      private Web3j web3j;
  
      private String fromAddress;
  
      private String toAddress;
  
      private String dataHex;
  
      private long extraGasLimit;
  
      @Override
      public BigInteger getGasLimit(String contractFunc) {
          return getGasLimitLogic(contractFunc);
      }
  
      @Override
      public BigInteger getGasLimit() {
          return getGasLimitLogic("");
      }
  
      @SneakyThrows
      private BigInteger getGasLimitLogic(String contractFunc) {
          EthEstimateGas ethEstimateGas;
          if (StrUtil.equals(contractFunc, "deploy")) {
              ethEstimateGas = web3j.ethEstimateGas(
                      Transaction.createEthCallTransaction(
                              fromAddress,
                              toAddress,
                              dataHex
                      )
              ).send();
          } else {
              ethEstimateGas = web3j.ethEstimateGas(
                      Transaction.createEthCallTransaction(
                              fromAddress,
                              toAddress,
                              dataHex
                      )
              ).send();
          }
          if (ethEstimateGas.hasError()) {
              throw new RuntimeException(StrUtil.format("failed to estimate gas for {} : {}", contractFunc, ethEstimateGas.getError().getMessage()));
          }
  
          return ethEstimateGas.getAmountUsed().add(BigInteger.valueOf(extraGasLimit));
      }
  }
  