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// Copyright 2015 Google Inc. 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.Preconditions;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Iterables;
import com.google.devtools.build.lib.events.Event;
import com.google.devtools.build.lib.events.EventHandler;
import com.google.devtools.build.lib.packages.BuildFileNotFoundException;
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.PackageIdentifier;
import com.google.devtools.build.lib.packages.Target;
import com.google.devtools.build.lib.pkgcache.RecursivePackageProvider;
import com.google.devtools.build.lib.syntax.Label;
import com.google.devtools.build.lib.vfs.PathFragment;
import com.google.devtools.build.lib.vfs.RootedPath;
import com.google.devtools.build.skyframe.SkyKey;
import com.google.devtools.build.skyframe.WalkableGraph;
import java.util.Collections;
/** A {@link RecursivePackageProvider} backed by a {@link WalkableGraph}. */
public final class GraphBackedRecursivePackageProvider implements RecursivePackageProvider {
private final WalkableGraph graph;
public GraphBackedRecursivePackageProvider(WalkableGraph graph) {
this.graph = graph;
}
@Override
public Package getPackage(EventHandler eventHandler, PackageIdentifier packageName)
throws NoSuchPackageException {
SkyKey pkgKey = PackageValue.key(packageName);
PackageValue pkgValue;
if (graph.exists(pkgKey)) {
pkgValue = (PackageValue) graph.getValue(pkgKey);
if (pkgValue == null) {
NoSuchPackageException noSuchPackageException =
(NoSuchPackageException) Preconditions.checkNotNull(graph.getException(pkgKey), pkgKey);
Package pkg = noSuchPackageException.getPackage();
if (pkg == null) {
throw noSuchPackageException;
}
return pkg;
}
} else {
// If the package key does not exist in the graph, then it must not correspond to any package,
// because the SkyQuery environment has already loaded the universe.
throw new BuildFileNotFoundException(packageName.toString(),
"BUILD file not found on package path");
}
return pkgValue.getPackage();
}
@Override
public boolean isPackage(EventHandler eventHandler, String packageName) {
SkyKey packageLookupKey = PackageLookupValue.key(new PathFragment(packageName));
if (!graph.exists(packageLookupKey)) {
// If the package lookup key does not exist in the graph, then it must not correspond to any
// package, because the SkyQuery environment has already loaded the universe.
return false;
}
PackageLookupValue packageLookupValue = (PackageLookupValue) graph.getValue(packageLookupKey);
if (packageLookupValue == null) {
Exception exception = Preconditions.checkNotNull(graph.getException(packageLookupKey),
"During package lookup for '%s', got null for exception", packageName);
if (exception instanceof NoSuchPackageException
|| exception instanceof InconsistentFilesystemException) {
eventHandler.handle(Event.error(exception.getMessage()));
return false;
} else {
throw new IllegalStateException("During package lookup for '" + packageName
+ "', got unexpected exception type", exception);
}
}
return packageLookupValue.packageExists();
}
@Override
public Iterable<PathFragment> getPackagesUnderDirectory(RootedPath directory,
ImmutableSet<PathFragment> excludedSubdirectories) {
SkyKey recursivePackageKey = RecursivePkgValue.key(directory, excludedSubdirectories);
if (!graph.exists(recursivePackageKey)) {
// If the recursive package key does not exist in the graph, then it must not correspond to
// any directory transitively containing packages, because the SkyQuery environment has
// already loaded the universe.
return Collections.emptyList();
}
// If the recursive package key exists in the graph, then it must have a value and must not
// have an exception, because RecursivePkgFunction#compute never throws.
RecursivePkgValue lookup =
(RecursivePkgValue) Preconditions.checkNotNull(graph.getValue(recursivePackageKey));
// TODO(bazel-team): Make RecursivePkgValue return NestedSet<PathFragment> so this transform is
// unnecessary.
return Iterables.transform(lookup.getPackages(), PathFragment.TO_PATH_FRAGMENT);
}
@Override
public Target getTarget(EventHandler eventHandler, Label label)
throws NoSuchPackageException, NoSuchTargetException {
return getPackage(eventHandler, label.getPackageIdentifier()).getTarget(label.getName());
}
}
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