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// Copyright 2015 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.Function;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import com.google.devtools.build.lib.cmdline.TargetParsingException;
import com.google.devtools.build.lib.events.Event;
import com.google.devtools.build.lib.events.ExtendedEventHandler;
import com.google.devtools.build.lib.pkgcache.ParsingFailedEvent;
import com.google.devtools.build.lib.skyframe.PrepareDepsOfPatternValue.PrepareDepsOfPatternSkyKeyException;
import com.google.devtools.build.lib.skyframe.PrepareDepsOfPatternValue.PrepareDepsOfPatternSkyKeyValue;
import com.google.devtools.build.lib.skyframe.PrepareDepsOfPatternValue.PrepareDepsOfPatternSkyKeysAndExceptions;
import com.google.devtools.build.lib.skyframe.PrepareDepsOfPatternsValue.TargetPatternSequence;
import com.google.devtools.build.lib.skyframe.TargetPatternValue.TargetPatternKey;
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.Map;
import javax.annotation.Nullable;
/**
* PrepareDepsOfPatternsFunction ensures the graph loads targets matching the pattern sequence and
* their transitive dependencies.
*/
public class PrepareDepsOfPatternsFunction implements SkyFunction {
public static ImmutableList<SkyKey> getSkyKeys(SkyKey skyKey, ExtendedEventHandler eventHandler) {
TargetPatternSequence targetPatternSequence = (TargetPatternSequence) skyKey.argument();
PrepareDepsOfPatternSkyKeysAndExceptions prepareDepsOfPatternSkyKeysAndExceptions =
PrepareDepsOfPatternValue.keys(targetPatternSequence.getPatterns(),
targetPatternSequence.getOffset());
ImmutableList.Builder<SkyKey> skyKeyBuilder = ImmutableList.builder();
for (PrepareDepsOfPatternSkyKeyValue skyKeyValue
: prepareDepsOfPatternSkyKeysAndExceptions.getValues()) {
skyKeyBuilder.add(skyKeyValue.getSkyKey());
}
for (PrepareDepsOfPatternSkyKeyException skyKeyException
: prepareDepsOfPatternSkyKeysAndExceptions.getExceptions()) {
TargetParsingException e = skyKeyException.getException();
// We post an event here rather than in handleTargetParsingException because the
// TargetPatternFunction already posts an event unless the pattern cannot be parsed, in
// which case the caller (i.e., us) needs to post an event.
eventHandler.post(
new ParsingFailedEvent(skyKeyException.getOriginalPattern(), e.getMessage()));
handleTargetParsingException(eventHandler, skyKeyException.getOriginalPattern(), e);
}
return skyKeyBuilder.build();
}
private static final Function<SkyKey, TargetPatternKey> SKY_TO_TARGET_PATTERN =
new Function<SkyKey, TargetPatternKey>() {
@Nullable
@Override
public TargetPatternKey apply(SkyKey skyKey) {
return (TargetPatternKey) skyKey.argument();
}
};
public static ImmutableList<TargetPatternKey> getTargetPatternKeys(
ImmutableList<SkyKey> skyKeys) {
return ImmutableList.copyOf(Iterables.transform(skyKeys, SKY_TO_TARGET_PATTERN));
}
/**
* 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 {
ExtendedEventHandler eventHandler = env.getListener();
ImmutableList<SkyKey> skyKeys = getSkyKeys(skyKey, eventHandler);
Map<SkyKey, ValueOrException<TargetParsingException>> tokensByKey =
env.getValuesOrThrow(skyKeys, TargetParsingException.class);
if (env.valuesMissing()) {
return null;
}
for (SkyKey key : skyKeys) {
try {
// The only exception type throwable by PrepareDepsOfPatternFunction is
// TargetParsingException. Therefore all ValueOrException values in the map will either
// be non-null or throw TargetParsingException when get is called.
Preconditions.checkNotNull(tokensByKey.get(key).get());
} catch (TargetParsingException e) {
// If a target pattern can't be evaluated, notify the user of the problem and keep going.
handleTargetParsingException(eventHandler, key, e);
}
}
return new PrepareDepsOfPatternsValue(getTargetPatternKeys(skyKeys));
}
private static void handleTargetParsingException(
ExtendedEventHandler eventHandler, SkyKey key, TargetParsingException e) {
TargetPatternKey patternKey = (TargetPatternKey) key.argument();
String rawPattern = patternKey.getPattern();
handleTargetParsingException(eventHandler, rawPattern, e);
}
private static void handleTargetParsingException(
ExtendedEventHandler eventHandler, String rawPattern, TargetParsingException e) {
String errorMessage = e.getMessage();
eventHandler.handle(Event.error("Skipping '" + rawPattern + "': " + errorMessage));
}
@Nullable
@Override
public String extractTag(SkyKey skyKey) {
return null;
}
}
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