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// Copyright 2014 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.common.collect.Iterables;
import com.google.common.collect.Maps;
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.Target;
import com.google.devtools.build.lib.pkgcache.FilteringPolicies;
import com.google.devtools.build.lib.pkgcache.FilteringPolicy;
import com.google.devtools.build.lib.pkgcache.ParseFailureListener;
import com.google.devtools.build.lib.pkgcache.TargetPatternEvaluator;
import com.google.devtools.build.lib.vfs.PathFragment;
import com.google.devtools.build.skyframe.ErrorInfo;
import com.google.devtools.build.skyframe.EvaluationResult;
import com.google.devtools.build.skyframe.SkyKey;
import java.util.Collection;
import java.util.List;
import java.util.Map;
/**
* Skyframe-based target pattern parsing.
*/
final class SkyframeTargetPatternEvaluator implements TargetPatternEvaluator {
private final SkyframeExecutor skyframeExecutor;
private String offset = "";
SkyframeTargetPatternEvaluator(SkyframeExecutor skyframeExecutor) {
this.skyframeExecutor = skyframeExecutor;
}
@Override
public ResolvedTargets<Target> parseTargetPatternList(EventHandler eventHandler,
List<String> targetPatterns, FilteringPolicy policy, boolean keepGoing)
throws TargetParsingException, InterruptedException {
return parseTargetPatternList(offset, eventHandler, targetPatterns, policy, keepGoing);
}
@Override
public ResolvedTargets<Target> parseTargetPattern(EventHandler eventHandler,
String pattern, boolean keepGoing) throws TargetParsingException, InterruptedException {
return parseTargetPatternList(eventHandler, ImmutableList.of(pattern),
FilteringPolicies.NO_FILTER, keepGoing);
}
@Override
public void updateOffset(PathFragment relativeWorkingDirectory) {
offset = relativeWorkingDirectory.getPathString();
}
@Override
public String getOffset() {
return offset;
}
@Override
public Map<String, ResolvedTargets<Target>> preloadTargetPatterns(EventHandler eventHandler,
Collection<String> patterns, boolean keepGoing)
throws TargetParsingException, InterruptedException {
// TODO(bazel-team): This is used only in "blaze query". There are plans to dramatically change
// how query works on Skyframe, in which case this method is likely to go away.
// We cannot use an ImmutableMap here because there may be null values.
Map<String, ResolvedTargets<Target>> result = Maps.newHashMapWithExpectedSize(patterns.size());
for (String pattern : patterns) {
// TODO(bazel-team): This could be parallelized to improve performance. [skyframe-loading]
result.put(pattern, parseTargetPattern(eventHandler, pattern, keepGoing));
}
return result;
}
/**
* Loads a list of target patterns (eg, "foo/...").
*/
ResolvedTargets<Target> parseTargetPatternList(String offset, EventHandler eventHandler,
List<String> targetPatterns, FilteringPolicy policy, boolean keepGoing)
throws InterruptedException, TargetParsingException {
Iterable<SkyKey> patternSkyKeys = TargetPatternValue.keys(targetPatterns, policy, offset);
EvaluationResult<TargetPatternValue> result =
skyframeExecutor.targetPatterns(patternSkyKeys, keepGoing, eventHandler);
String errorMessage = null;
ResolvedTargets.Builder<Target> builder = ResolvedTargets.builder();
for (SkyKey key : patternSkyKeys) {
TargetPatternValue resultValue = result.get(key);
if (resultValue != null) {
ResolvedTargets<Target> results = resultValue.getTargets();
if (((TargetPatternValue.TargetPattern) key.argument()).isNegative()) {
builder.filter(Predicates.not(Predicates.in(results.getTargets())));
} else {
builder.merge(results);
}
} else {
TargetPatternValue.TargetPattern pattern =
(TargetPatternValue.TargetPattern) key.argument();
String rawPattern = pattern.getPattern();
ErrorInfo error = result.errorMap().get(key);
if (error == null) {
Preconditions.checkState(!keepGoing);
continue;
}
if (error.getException() != null) {
errorMessage = error.getException().getMessage();
} else if (!Iterables.isEmpty(error.getCycleInfo())) {
errorMessage = "cycles detected during target parsing";
skyframeExecutor.getCyclesReporter().reportCycles(
error.getCycleInfo(), key, eventHandler);
} else {
throw new IllegalStateException(error.toString());
}
if (keepGoing) {
eventHandler.handle(Event.error("Skipping '" + rawPattern + "': " + errorMessage));
}
builder.setError();
if (eventHandler instanceof ParseFailureListener) {
ParseFailureListener parseListener = (ParseFailureListener) eventHandler;
parseListener.parsingError(rawPattern, errorMessage);
}
}
}
if (!keepGoing && result.hasError()) {
Preconditions.checkState(errorMessage != null, "unexpected errors: %s", result.errorMap());
throw new TargetParsingException(errorMessage);
}
return builder.build();
}
}
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