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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.Supplier;
import com.google.devtools.build.lib.analysis.BlazeDirectories;
import com.google.devtools.build.lib.analysis.config.BuildConfiguration;
import com.google.devtools.build.lib.analysis.config.BuildConfigurationCollection;
import com.google.devtools.build.lib.analysis.config.BuildConfigurationKey;
import com.google.devtools.build.lib.analysis.config.BuildOptions;
import com.google.devtools.build.lib.analysis.config.ConfigurationFactory;
import com.google.devtools.build.lib.analysis.config.InvalidConfigurationException;
import com.google.devtools.build.lib.analysis.config.PackageProviderForConfigurations;
import com.google.devtools.build.lib.events.EventHandler;
import com.google.devtools.build.lib.events.StoredEventHandler;
import com.google.devtools.build.lib.packages.Package;
import com.google.devtools.build.lib.skyframe.ConfigurationCollectionValue.ConfigurationCollectionKey;
import com.google.devtools.build.skyframe.SkyFunction;
import com.google.devtools.build.skyframe.SkyFunctionException;
import com.google.devtools.build.skyframe.SkyKey;
import com.google.devtools.build.skyframe.SkyValue;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.annotation.Nullable;
/**
* A builder for {@link ConfigurationCollectionValue} instances.
*/
public class ConfigurationCollectionFunction implements SkyFunction {
private final Supplier<ConfigurationFactory> configurationFactory;
private final Supplier<Map<String, String>> clientEnv;
private final Supplier<Set<Package>> configurationPackages;
public ConfigurationCollectionFunction(
Supplier<ConfigurationFactory> configurationFactory,
Supplier<Map<String, String>> clientEnv,
Supplier<Set<Package>> configurationPackages) {
this.configurationFactory = configurationFactory;
this.clientEnv = clientEnv;
this.configurationPackages = configurationPackages;
}
@Override
public SkyValue compute(SkyKey skyKey, Environment env) throws InterruptedException,
ConfigurationCollectionFunctionException {
ConfigurationCollectionKey collectionKey = (ConfigurationCollectionKey) skyKey.argument();
try {
// We are not using this value, because test_environment can be created from clientEnv. But
// we want ConfigurationCollection to be recomputed each time when test_environment changes.
PrecomputedValue.TEST_ENVIRONMENT_VARIABLES.get(env);
BlazeDirectories directories = PrecomputedValue.BLAZE_DIRECTORIES.get(env);
if (env.valuesMissing()) {
return null;
}
BuildConfigurationCollection result =
getConfigurations(env.getListener(),
new SkyframePackageLoaderWithValueEnvironment(env, configurationPackages.get()),
new BuildConfigurationKey(collectionKey.getBuildOptions(), directories, clientEnv.get(),
collectionKey.getMultiCpu()));
// BuildConfigurationCollection can be created, but dependencies to some files might be
// missing. In that case we need to build configurationCollection again.
if (env.valuesMissing()) {
return null;
}
for (BuildConfiguration config : result.getTargetConfigurations()) {
config.declareSkyframeDependencies(env);
}
if (env.valuesMissing()) {
return null;
}
return new ConfigurationCollectionValue(result, configurationPackages.get());
} catch (InvalidConfigurationException e) {
throw new ConfigurationCollectionFunctionException(e);
}
}
/** Create the build configurations with the given options. */
private BuildConfigurationCollection getConfigurations(EventHandler eventHandler,
PackageProviderForConfigurations loadedPackageProvider, BuildConfigurationKey key)
throws InvalidConfigurationException {
List<BuildConfiguration> targetConfigurations = new ArrayList<>();
if (!key.getMultiCpu().isEmpty()) {
for (String cpu : key.getMultiCpu()) {
BuildConfiguration targetConfiguration = createConfiguration(
eventHandler, loadedPackageProvider, key, cpu);
if (targetConfiguration == null || targetConfigurations.contains(targetConfiguration)) {
continue;
}
targetConfigurations.add(targetConfiguration);
}
if (loadedPackageProvider.valuesMissing()) {
return null;
}
} else {
BuildConfiguration targetConfiguration = createConfiguration(
eventHandler, loadedPackageProvider, key, null);
if (targetConfiguration == null) {
return null;
}
targetConfigurations.add(targetConfiguration);
}
return new BuildConfigurationCollection(targetConfigurations);
}
@Nullable
public BuildConfiguration createConfiguration(
EventHandler originalEventListener,
PackageProviderForConfigurations loadedPackageProvider,
BuildConfigurationKey key, String cpuOverride) throws InvalidConfigurationException {
StoredEventHandler errorEventListener = new StoredEventHandler();
BuildOptions buildOptions = key.getBuildOptions();
if (cpuOverride != null) {
// TODO(bazel-team): Options classes should be immutable. This is a bit of a hack.
buildOptions = buildOptions.clone();
buildOptions.get(BuildConfiguration.Options.class).cpu = cpuOverride;
}
BuildConfiguration targetConfig = configurationFactory.get().createConfiguration(
loadedPackageProvider, buildOptions, key, errorEventListener);
if (targetConfig == null) {
return null;
}
errorEventListener.replayOn(originalEventListener);
if (errorEventListener.hasErrors()) {
throw new InvalidConfigurationException("Build options are invalid");
}
return targetConfig;
}
@Override
public String extractTag(SkyKey skyKey) {
return null;
}
/**
* Used to declare all the exception types that can be wrapped in the exception thrown by
* {@link ConfigurationCollectionFunction#compute}.
*/
private static final class ConfigurationCollectionFunctionException extends
SkyFunctionException {
public ConfigurationCollectionFunctionException(InvalidConfigurationException e) {
super(e, Transience.PERSISTENT);
}
}
}
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