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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.base.Predicates;
import com.google.common.collect.ImmutableList;
import com.google.devtools.build.lib.cmdline.ResolvedTargets;
import com.google.devtools.build.lib.cmdline.TargetParsingException;
import com.google.devtools.build.lib.events.Event;
import com.google.devtools.build.lib.events.EventHandler;
import com.google.devtools.build.lib.packages.NoSuchPackageException;
import com.google.devtools.build.lib.packages.NoSuchTargetException;
import com.google.devtools.build.lib.pkgcache.ParseFailureListener;
import com.google.devtools.build.lib.skyframe.PrepareDepsOfPatternsValue.TargetPatternSequence;
import com.google.devtools.build.lib.skyframe.TargetPatternValue.TargetPatternKey;
import com.google.devtools.build.lib.skyframe.TargetPatternValue.TargetPatternSkyKeyOrException;
import com.google.devtools.build.lib.syntax.Label;
import com.google.devtools.build.skyframe.SkyFunction;
import com.google.devtools.build.skyframe.SkyKey;
import com.google.devtools.build.skyframe.SkyValue;
import com.google.devtools.build.skyframe.ValueOrException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import javax.annotation.Nullable;
/**
* PrepareDepsOfPatternsFunction ensures the graph loads targets matching the pattern sequence and
* their transitive dependencies.
*/
public class PrepareDepsOfPatternsFunction implements SkyFunction {
/**
* Given a {@link SkyKey} that contains a sequence of target patterns, when this function returns
* {@link PrepareDepsOfPatternsValue}, then all targets matching that sequence, and those targets'
* transitive dependencies, have been loaded.
*/
@Nullable
@Override
public SkyValue compute(SkyKey skyKey, Environment env) throws InterruptedException {
EventHandler eventHandler = env.getListener();
boolean handlerIsParseFailureListener = eventHandler instanceof ParseFailureListener;
TargetPatternSequence targetPatternSequence = (TargetPatternSequence) skyKey.argument();
Iterable<TargetPatternSkyKeyOrException> keysMaybe =
TargetPatternValue.keys(targetPatternSequence.getPatterns(),
targetPatternSequence.getPolicy(), targetPatternSequence.getOffset());
ImmutableList.Builder<SkyKey> skyKeyBuilder = ImmutableList.builder();
for (TargetPatternSkyKeyOrException skyKeyOrException : keysMaybe) {
try {
skyKeyBuilder.add(skyKeyOrException.getSkyKey());
} catch (TargetParsingException e) {
handleTargetParsingException(eventHandler, handlerIsParseFailureListener,
skyKeyOrException.getOriginalPattern(), e);
}
}
ImmutableList<SkyKey> skyKeys = skyKeyBuilder.build();
Map<SkyKey, ValueOrException<TargetParsingException>> targetPatternValuesByKey =
env.getValuesOrThrow(skyKeys, TargetParsingException.class);
if (env.valuesMissing()) {
return null;
}
ResolvedTargets.Builder<Label> builder = ResolvedTargets.builder();
for (SkyKey key : skyKeys) {
try {
// The only exception type throwable by TargetPatternFunction is TargetParsingException.
// Therefore all ValueOrException values in the map will either be non-null or throw
// TargetParsingException when get is called.
TargetPatternValue resultValue = Preconditions.checkNotNull(
(TargetPatternValue) targetPatternValuesByKey.get(key).get());
ResolvedTargets<Label> results = resultValue.getTargets();
if (((TargetPatternKey) key.argument()).isNegative()) {
builder.filter(Predicates.not(Predicates.in(results.getTargets())));
} else {
builder.merge(results);
}
} catch (TargetParsingException e) {
// If a target pattern can't be evaluated, notify the user of the problem and keep going.
handleTargetParsingException(eventHandler, handlerIsParseFailureListener, key, e);
}
}
ResolvedTargets<Label> resolvedTargets = builder.build();
List<SkyKey> targetKeys = new ArrayList<>();
for (Label target : resolvedTargets.getTargets()) {
targetKeys.add(TransitiveTargetValue.key(target));
}
// TransitiveTargetFunction can produce exceptions of types NoSuchPackageException and
// NoSuchTargetException. However, PrepareDepsOfPatternsFunction doesn't care about any errors
// found during transitive target loading--it just wants the graph to have loaded whatever
// transitive target values are available.
env.getValuesOrThrow(targetKeys, NoSuchPackageException.class, NoSuchTargetException.class);
if (env.valuesMissing()) {
return null;
}
return PrepareDepsOfPatternsValue.INSTANCE;
}
private static void handleTargetParsingException(EventHandler eventHandler,
boolean handlerIsParseFailureListener, SkyKey key, TargetParsingException e) {
TargetPatternKey patternKey = (TargetPatternKey) key.argument();
String rawPattern = patternKey.getPattern();
handleTargetParsingException(eventHandler, handlerIsParseFailureListener, rawPattern, e);
}
private static void handleTargetParsingException(EventHandler eventHandler,
boolean handlerIsParseFailureListener, String rawPattern, TargetParsingException e) {
String errorMessage = e.getMessage();
eventHandler.handle(Event.error("Skipping '" + rawPattern + "': " + errorMessage));
if (handlerIsParseFailureListener) {
ParseFailureListener parseListener = (ParseFailureListener) eventHandler;
parseListener.parsingError(rawPattern, errorMessage);
}
}
@Nullable
@Override
public String extractTag(SkyKey skyKey) {
return null;
}
}
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