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// 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.runtime;
import com.google.common.base.Preconditions;
import com.google.common.base.Throwables;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.cmdline.PackageIdentifier;
import com.google.devtools.build.lib.events.ExtendedEventHandler;
import com.google.devtools.build.lib.packages.BuildFileContainsErrorsException;
import com.google.devtools.build.lib.packages.NoSuchPackageException;
import com.google.devtools.build.lib.packages.NoSuchTargetException;
import com.google.devtools.build.lib.packages.Package;
import com.google.devtools.build.lib.packages.Target;
import com.google.devtools.build.lib.pkgcache.TargetProvider;
import com.google.devtools.build.lib.skyframe.PackageValue;
import com.google.devtools.build.skyframe.SkyKey;
import com.google.devtools.build.skyframe.SkyValue;
import com.google.devtools.build.skyframe.WalkableGraph;
import java.util.Optional;
/**
* Serves as TargetProvider using WalkableGraph as direct access to graph. Refers to delegate in
* case if WalkableGraph has not value for specific key.
*/
public class TargetProviderForQueryEnvironment implements TargetProvider {
private final WalkableGraph walkableGraph;
/**
* If WalkableGraph has not node requested, then delegate used as fall back strategy.
*/
private final TargetProvider delegate;
public TargetProviderForQueryEnvironment(WalkableGraph walkableGraph, TargetProvider delegate) {
this.walkableGraph = Preconditions.checkNotNull(walkableGraph);
this.delegate = Preconditions.checkNotNull(delegate);
}
@Override
public Target getTarget(ExtendedEventHandler eventHandler, Label label)
throws NoSuchPackageException, NoSuchTargetException, InterruptedException {
Optional<Package> optional = getPackageFromWalkableGraph(label.getPackageIdentifier());
if (optional.isPresent()) {
return optional.get().getTarget(label.getName());
}
return delegate.getTarget(eventHandler, label);
}
private Optional<Package> getPackageFromWalkableGraph(PackageIdentifier pkgId)
throws InterruptedException, NoSuchPackageException {
SkyKey packageKey = PackageValue.key(pkgId);
SkyValue skyValue = walkableGraph.getValue(packageKey);
if (skyValue != null) {
PackageValue packageValue = (PackageValue) skyValue;
return Optional.of(packageValue.getPackage());
}
Exception exception = walkableGraph.getException(packageKey);
if (exception != null) {
// PackageFunction should be catching, swallowing, and rethrowing all transitive
// errors as NoSuchPackageExceptions or constructing packages with errors.
Throwables.propagateIfPossible(exception, NoSuchPackageException.class);
throw new IllegalStateException("Unexpected Exception type from PackageValue for " + pkgId);
}
if (walkableGraph.isCycle(packageKey)) {
throw new BuildFileContainsErrorsException(
pkgId, "Cycle encountered while loading package " + pkgId);
}
return Optional.empty();
}
}
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