/* * Copyright 2019 Web3 Labs Ltd. * * 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 org.web3j.tx; import java.io.IOException; import java.math.BigInteger; import org.web3j.protocol.Web3j; import org.web3j.protocol.core.DefaultBlockParameter; import org.web3j.protocol.core.methods.request.Transaction; import org.web3j.protocol.core.methods.response.EthCall; import org.web3j.protocol.core.methods.response.EthGetCode; import org.web3j.protocol.core.methods.response.EthSendTransaction; /** Transaction manager implementation for read-only operations on smart contracts. */ public class ReadonlyTransactionManager extends TransactionManager { private final Web3j web3j; private String fromAddress; public ReadonlyTransactionManager(Web3j web3j, String fromAddress) { super(web3j, fromAddress); this.web3j = web3j; this.fromAddress = fromAddress; } @Override public EthSendTransaction sendTransaction( BigInteger gasPrice, BigInteger gasLimit, String to, String data, BigInteger value, boolean constructor) throws IOException { throw new UnsupportedOperationException( "Only read operations are supported by this transaction manager"); } @Override public EthSendTransaction sendTransactionEIP1559( BigInteger gasPremium, BigInteger feeCap, BigInteger gasLimit, String to, String data, BigInteger value, boolean constructor) throws IOException { throw new UnsupportedOperationException( "Only read operations are supported by this transaction manager"); } @Override public String sendCall(String to, String data, DefaultBlockParameter defaultBlockParameter) throws IOException { EthCall ethCall = web3j.ethCall( Transaction.createEthCallTransaction(fromAddress, to, data), defaultBlockParameter) .send(); assertCallNotReverted(ethCall); return ethCall.getValue(); } @Override public EthGetCode getCode( final String contractAddress, final DefaultBlockParameter defaultBlockParameter) throws IOException { return web3j.ethGetCode(contractAddress, defaultBlockParameter).send(); } }