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Hedera EVM - API

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/*
 * Copyright (C) 2022-2024 Hedera Hashgraph, LLC
 *
 * 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.hedera.node.app.service.evm.contracts.execution;

import org.apache.tuweni.bytes.Bytes32;
import org.hyperledger.besu.datatypes.Hash;
import org.hyperledger.besu.evm.frame.BlockValues;

/** Provides block information to a {@link HederaEvmTxProcessor}. */
public interface BlockMetaSource {
    Hash UNAVAILABLE_BLOCK_HASH = org.hyperledger.besu.datatypes.Hash.wrap(Bytes32.wrap(new byte[32]));

    /**
     * Returns the hash of the given block number, or {@link BlockMetaSource#UNAVAILABLE_BLOCK_HASH}
     * if unavailable.
     *
     * @param blockNo the block number of interest
     * @return its hash, if available
     */
    Hash getBlockHash(long blockNo);

    /**
     * Returns the in-scope block values, given an effective gas limit.
     *
     * @param gasLimit the effective gas limit
     * @return the scoped block values
     */
    BlockValues computeBlockValues(long gasLimit);
}