// Copyright 2014 The Bazel Authors. All rights reserved.
//
// 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.google.devtools.build.lib.util;

import com.google.devtools.build.lib.server.FailureDetails.Command;
import com.google.devtools.build.lib.server.FailureDetails.FailureDetail;
import com.google.protobuf.ExtensionRegistryLite;
import com.google.protobuf.InvalidProtocolBufferException;
import javax.annotation.Nullable;

/**
 * An exception thrown by various error conditions that are severe enough to halt the command (e.g.
 * even a --keep_going build). These typically need to signal to the handling code what happened.
 * Therefore, these exceptions contain a {@link DetailedExitCode} specifying a numeric exit code and
 * a detailed failure for the command to return.
 *
 * <p>When an instance of this exception is thrown, Bazel will try to halt the command as soon as
 * reasonably possible.
 */
public class AbruptExitException extends Exception {

  private final DetailedExitCode detailedExitCode;

  public AbruptExitException(DetailedExitCode detailedExitCode) {
    super(detailedExitCode.getFailureDetail().getMessage());
    this.detailedExitCode = detailedExitCode;
  }

  public AbruptExitException(DetailedExitCode detailedExitCode, @Nullable Throwable cause) {
    super(detailedExitCode.getFailureDetail().getMessage(), cause);
    this.detailedExitCode = detailedExitCode;
  }

  public ExitCode getExitCode() {
    return detailedExitCode.getExitCode();
  }

  public DetailedExitCode getDetailedExitCode() {
    return detailedExitCode;
  }

  public SerializedAbruptExitException toSerialized() {
    byte[] serializedFailureDetail = detailedExitCode.getFailureDetail().toByteArray();
    return new SerializedAbruptExitException(getMessage(), serializedFailureDetail, this);
  }

  public static AbruptExitException fromSerialized(SerializedAbruptExitException e) {
    try {
      FailureDetail failureDetail =
          FailureDetail.parseFrom(
              e.getSerializedFailureDetail(), ExtensionRegistryLite.getEmptyRegistry());
      return new AbruptExitException(DetailedExitCode.of(failureDetail), e);
    } catch (InvalidProtocolBufferException ipbe) {
      return new AbruptExitException(
          DetailedExitCode.of(
              FailureDetail.newBuilder()
                  .setMessage(
                      "Failed to parse FailureDetail from SerializedAbruptExitException: "
                          + ipbe.getMessage())
                  .setCommand(Command.newBuilder().setCode(Command.Code.COMMAND_FAILURE_UNKNOWN))
                  .build()),
          ipbe);
    }
  }
}
