src/main/java/com/google/devtools/build/lib/skyframe/ToolchainException.java

// Copyright 2018 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.skyframe;

import com.google.common.base.Strings;
import com.google.devtools.build.lib.analysis.TargetAndConfiguration;
import com.google.devtools.build.lib.server.FailureDetails;
import com.google.devtools.build.lib.server.FailureDetails.FailureDetail;
import com.google.devtools.build.lib.server.FailureDetails.Toolchain.Code;
import com.google.devtools.build.lib.util.DetailedExitCode;

/** Base class for exceptions that happen during toolchain resolution. */
public abstract class ToolchainException extends Exception implements DetailedException {

  public ToolchainException(String message) {
    super(message);
  }

  public ToolchainException(Throwable cause) {
    super(cause);
  }

  public ToolchainException(String message, Throwable cause) {
    super(message, cause);
  }

  protected abstract Code getDetailedCode();

  @Override
  public DetailedExitCode getDetailedExitCode() {
    if (getCause() instanceof DetailedException) {
      return ((DetailedException) getCause()).getDetailedExitCode();
    }

    return DetailedExitCode.of(
        FailureDetail.newBuilder()
            .setMessage(Strings.nullToEmpty(getMessage()))
            .setToolchain(FailureDetails.Toolchain.newBuilder().setCode(getDetailedCode()))
            .build());
  }

  /**
   * Attempt to find a {@link ConfiguredValueCreationException} in a {@link ToolchainException}, or
   * its causes.
   *
   * <p>If one cannot be found, make a new one.
   */
  ConfiguredValueCreationException asConfiguredValueCreationException(
      TargetAndConfiguration targetAndConfiguration) {
    for (Throwable cause = getCause();
        cause != null && cause != cause.getCause();
        cause = cause.getCause()) {
      if (cause instanceof ConfiguredValueCreationException) {
        return (ConfiguredValueCreationException) cause;
      }
    }
    return new ConfiguredValueCreationException(
        targetAndConfiguration,
        String.format(
            "While resolving toolchains for target %s: %s",
            targetAndConfiguration.getLabel(), getMessage()),
        null,
        getDetailedExitCode());
  }
}