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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.skyframe;
import static com.google.common.collect.ImmutableSet.toImmutableSet;
import com.google.common.base.Function;
import com.google.common.base.Objects;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Maps;
import com.google.devtools.build.lib.cmdline.RepositoryName;
import com.google.devtools.build.lib.events.Event;
import com.google.devtools.build.lib.events.ExtendedEventHandler;
import com.google.devtools.build.lib.vfs.PathFragment;
import com.google.devtools.build.lib.vfs.Root;
import com.google.devtools.build.lib.vfs.RootedPath;
import com.google.devtools.build.skyframe.SkyKey;
import com.google.devtools.build.skyframe.SkyValue;
import com.google.devtools.build.skyframe.WalkableGraph;
import java.util.List;
import java.util.Map;
import java.util.Set;
/** Looks up values under {@link TraversalInfo}s of given roots in a {@link WalkableGraph}. */
public class TraversalInfoRootPackageExtractor implements RootPackageExtractor {
public Iterable<PathFragment> getPackagesFromRoots(
WalkableGraph graph,
List<Root> roots,
ExtendedEventHandler eventHandler,
RepositoryName repository,
PathFragment directory,
ImmutableSet<PathFragment> blacklistedSubdirectories,
ImmutableSet<PathFragment> excludedSubdirectories)
throws InterruptedException {
// If we found a TargetsBelowDirectory pattern in the universe that contains this directory,
// then we can look for packages in and under it in the graph. If we didn't find one, then the
// directory wasn't in the universe, so return an empty list.
ImmutableList.Builder<PathFragment> builder = ImmutableList.builder();
for (Root root : roots) {
RootedPath rootedDir = RootedPath.toRootedPath(root, directory);
TraversalInfo info =
new TraversalInfo(rootedDir, blacklistedSubdirectories, excludedSubdirectories);
collectPackagesUnder(graph, eventHandler, repository, ImmutableSet.of(info), builder);
}
return builder.build();
}
private void collectPackagesUnder(
WalkableGraph graph,
ExtendedEventHandler eventHandler,
final RepositoryName repository,
Set<TraversalInfo> traversals,
ImmutableList.Builder<PathFragment> builder)
throws InterruptedException {
Map<TraversalInfo, SkyKey> traversalToKeyMap =
Maps.asMap(
traversals,
new Function<TraversalInfo, SkyKey>() {
@Override
public SkyKey apply(TraversalInfo traversalInfo) {
return CollectPackagesUnderDirectoryValue.key(
repository, traversalInfo.rootedDir, traversalInfo.blacklistedSubdirectories);
}
});
Map<SkyKey, SkyValue> values = graph.getSuccessfulValues(traversalToKeyMap.values());
ImmutableSet.Builder<TraversalInfo> subdirTraversalBuilder = ImmutableSet.builder();
for (Map.Entry<TraversalInfo, SkyKey> entry : traversalToKeyMap.entrySet()) {
TraversalInfo info = entry.getKey();
SkyKey key = entry.getValue();
SkyValue val = values.get(key);
CollectPackagesUnderDirectoryValue collectPackagesValue =
(CollectPackagesUnderDirectoryValue) val;
if (collectPackagesValue != null) {
if (collectPackagesValue.isDirectoryPackage()) {
builder.add(info.rootedDir.getRootRelativePath());
}
if (collectPackagesValue.getErrorMessage() != null) {
eventHandler.handle(Event.error(collectPackagesValue.getErrorMessage()));
}
ImmutableMap<RootedPath, Boolean> subdirectoryTransitivelyContainsPackages =
collectPackagesValue.getSubdirectoryTransitivelyContainsPackagesOrErrors();
for (RootedPath subdirectory : subdirectoryTransitivelyContainsPackages.keySet()) {
if (subdirectoryTransitivelyContainsPackages.get(subdirectory)) {
PathFragment subdirectoryRelativePath = subdirectory.getRootRelativePath();
ImmutableSet<PathFragment> blacklistedSubdirectoriesBeneathThisSubdirectory =
info.blacklistedSubdirectories
.stream()
.filter(pathFragment -> pathFragment.startsWith(subdirectoryRelativePath))
.collect(toImmutableSet());
ImmutableSet<PathFragment> excludedSubdirectoriesBeneathThisSubdirectory =
info.excludedSubdirectories
.stream()
.filter(pathFragment -> pathFragment.startsWith(subdirectoryRelativePath))
.collect(toImmutableSet());
if (!excludedSubdirectoriesBeneathThisSubdirectory.contains(subdirectoryRelativePath)) {
subdirTraversalBuilder.add(
new TraversalInfo(
subdirectory,
blacklistedSubdirectoriesBeneathThisSubdirectory,
excludedSubdirectoriesBeneathThisSubdirectory));
}
}
}
}
}
ImmutableSet<TraversalInfo> subdirTraversals = subdirTraversalBuilder.build();
if (!subdirTraversals.isEmpty()) {
collectPackagesUnder(graph, eventHandler, repository, subdirTraversals, builder);
}
}
private static final class TraversalInfo {
private final RootedPath rootedDir;
// Set of blacklisted directories. The graph is assumed to be prepopulated with
// CollectPackagesUnderDirectoryValue nodes whose keys have blacklisted packages embedded in
// them. Therefore, we need to be careful to request and use the same sort of keys here in our
// traversal.
private final ImmutableSet<PathFragment> blacklistedSubdirectories;
// Set of directories, targets under which should be excluded from the traversal results.
// Excluded directory information isn't part of the graph keys in the prepopulated graph, so we
// need to perform the filtering ourselves.
private final ImmutableSet<PathFragment> excludedSubdirectories;
private TraversalInfo(
RootedPath rootedDir,
ImmutableSet<PathFragment> blacklistedSubdirectories,
ImmutableSet<PathFragment> excludedSubdirectories) {
this.rootedDir = rootedDir;
this.blacklistedSubdirectories = blacklistedSubdirectories;
this.excludedSubdirectories = excludedSubdirectories;
}
@Override
public int hashCode() {
return Objects.hashCode(rootedDir, blacklistedSubdirectories, excludedSubdirectories);
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj instanceof TraversalInfo) {
TraversalInfo otherTraversal = (TraversalInfo) obj;
return Objects.equal(rootedDir, otherTraversal.rootedDir)
&& Objects.equal(blacklistedSubdirectories, otherTraversal.blacklistedSubdirectories)
&& Objects.equal(excludedSubdirectories, otherTraversal.excludedSubdirectories);
}
return false;
}
}
}
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