ValidatorExitsValidator.java

/*
 * Copyright contributors to Hyperledger Besu
 *
 *
 * 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.
 *
 * SPDX-License-Identifier: Apache-2.0
 */

package org.hyperledger.besu.ethereum.mainnet;

import org.hyperledger.besu.ethereum.core.ValidatorExit;

import java.util.List;
import java.util.Optional;

public interface ValidatorExitsValidator {

  boolean validateValidatorExitParameter(Optional<List<ValidatorExit>> validatorExits);

  /** Used before Prague */
  class ProhibitedExits implements ValidatorExitsValidator {

    /**
     * Before Prague we do not expect to have execution layer triggered exits, so it is expected the
     * optional parameter will be empty
     *
     * @param validatorExits Optional list of exits
     * @return true, if valid, false otherwise
     */
    @Override
    public boolean validateValidatorExitParameter(
        final Optional<List<ValidatorExit>> validatorExits) {
      return validatorExits.isEmpty();
    }
  }

  /** Used after Prague */
  class AllowedExits implements ValidatorExitsValidator {

    @Override
    public boolean validateValidatorExitParameter(
        final Optional<List<ValidatorExit>> validatorExits) {
      // TODO implement any extra required validation (see
      // https://github.com/hyperledger/besu/issues/6800)
      return validatorExits.isPresent();
    }
  }
}