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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 com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.ImmutableList;
import com.google.devtools.build.lib.analysis.ConfiguredTarget;
import com.google.devtools.build.lib.analysis.PlatformConfiguration;
import com.google.devtools.build.lib.analysis.config.BuildConfiguration;
import com.google.devtools.build.lib.analysis.platform.PlatformInfo;
import com.google.devtools.build.lib.analysis.platform.PlatformProviderUtils;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.packages.Package;
import com.google.devtools.build.lib.skyframe.ConfiguredTargetFunction.ConfiguredValueCreationException;
import com.google.devtools.build.skyframe.SkyFunction;
import com.google.devtools.build.skyframe.SkyFunctionException;
import com.google.devtools.build.skyframe.SkyFunctionException.Transience;
import com.google.devtools.build.skyframe.SkyKey;
import com.google.devtools.build.skyframe.SkyValue;
import com.google.devtools.build.skyframe.ValueOrException;
import java.util.List;
import java.util.Map;
import javax.annotation.Nullable;
/** {@link SkyFunction} that returns all registered execution platforms available. */
public class RegisteredExecutionPlatformsFunction implements SkyFunction {
@Nullable
@Override
public SkyValue compute(SkyKey skyKey, Environment env)
throws SkyFunctionException, InterruptedException {
BuildConfiguration configuration = (BuildConfiguration) skyKey.argument();
ImmutableList.Builder<Label> registeredExecutionPlatformLabels = new ImmutableList.Builder<>();
// Get the execution platforms from the configuration.
PlatformConfiguration platformConfiguration =
configuration.getFragment(PlatformConfiguration.class);
if (platformConfiguration != null) {
registeredExecutionPlatformLabels.addAll(platformConfiguration.getExtraExecutionPlatforms());
}
// Get the registered execution platforms from the WORKSPACE.
List<Label> workspaceExecutionPlatforms = getWorkspaceExecutionPlatforms(env);
if (workspaceExecutionPlatforms == null) {
return null;
}
registeredExecutionPlatformLabels.addAll(workspaceExecutionPlatforms);
// Load the configured target for each, and get the declared execution platforms providers.
ImmutableList<PlatformInfo> registeredExecutionPlatforms =
configureRegisteredExecutionPlatforms(
env, configuration, registeredExecutionPlatformLabels.build());
if (env.valuesMissing()) {
return null;
}
return RegisteredExecutionPlatformsValue.create(registeredExecutionPlatforms);
}
/**
* Loads the external package and then returns the registered execution platform labels.
*
* @param env the environment to use for lookups
*/
@Nullable
@VisibleForTesting
public static List<Label> getWorkspaceExecutionPlatforms(Environment env)
throws InterruptedException {
PackageValue externalPackageValue =
(PackageValue) env.getValue(PackageValue.key(Label.EXTERNAL_PACKAGE_IDENTIFIER));
if (externalPackageValue == null) {
return null;
}
Package externalPackage = externalPackageValue.getPackage();
return externalPackage.getRegisteredExecutionPlatformLabels();
}
private ImmutableList<PlatformInfo> configureRegisteredExecutionPlatforms(
Environment env, BuildConfiguration configuration, List<Label> labels)
throws InterruptedException, RegisteredExecutionPlatformsFunctionException {
ImmutableList<SkyKey> keys =
labels
.stream()
.map(label -> ConfiguredTargetKey.of(label, configuration))
.collect(ImmutableList.toImmutableList());
Map<SkyKey, ValueOrException<ConfiguredValueCreationException>> values =
env.getValuesOrThrow(keys, ConfiguredValueCreationException.class);
ImmutableList.Builder<PlatformInfo> platforms = new ImmutableList.Builder<>();
boolean valuesMissing = false;
for (SkyKey key : keys) {
ConfiguredTargetKey configuredTargetKey = (ConfiguredTargetKey) key.argument();
Label platformLabel = configuredTargetKey.getLabel();
try {
ValueOrException<ConfiguredValueCreationException> valueOrException = values.get(key);
if (valueOrException.get() == null) {
valuesMissing = true;
continue;
}
ConfiguredTarget target =
((ConfiguredTargetValue) valueOrException.get()).getConfiguredTarget();
PlatformInfo platformInfo = PlatformProviderUtils.platform(target);
if (platformInfo == null) {
throw new RegisteredExecutionPlatformsFunctionException(
new InvalidExecutionPlatformLabelException(platformLabel), Transience.PERSISTENT);
}
platforms.add(platformInfo);
} catch (ConfiguredValueCreationException e) {
throw new RegisteredExecutionPlatformsFunctionException(
new InvalidExecutionPlatformLabelException(platformLabel, e), Transience.PERSISTENT);
}
}
if (valuesMissing) {
return null;
}
return platforms.build();
}
@Nullable
@Override
public String extractTag(SkyKey skyKey) {
return null;
}
/**
* Used to indicate that the given {@link Label} represents a {@link ConfiguredTarget} which is
* not a valid {@link PlatformInfo} provider.
*/
public static final class InvalidExecutionPlatformLabelException extends Exception {
private final Label invalidLabel;
public InvalidExecutionPlatformLabelException(Label invalidLabel) {
super(
String.format(
"invalid registered execution platform '%s': "
+ "target does not provide the PlatformInfo provider",
invalidLabel));
this.invalidLabel = invalidLabel;
}
public InvalidExecutionPlatformLabelException(
Label invalidLabel, ConfiguredValueCreationException e) {
super(
String.format(
"invalid registered execution platform '%s': %s", invalidLabel, e.getMessage()),
e);
this.invalidLabel = invalidLabel;
}
public Label getInvalidLabel() {
return invalidLabel;
}
}
/**
* Used to declare all the exception types that can be wrapped in the exception thrown by {@link
* #compute}.
*/
public static class RegisteredExecutionPlatformsFunctionException extends SkyFunctionException {
public RegisteredExecutionPlatformsFunctionException(
InvalidExecutionPlatformLabelException cause, Transience transience) {
super(cause, transience);
}
}
}
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