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// Copyright 2017 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.rules.platform;
import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Iterables;
import com.google.common.collect.Multimap;
import com.google.devtools.build.lib.analysis.ConfiguredTarget;
import com.google.devtools.build.lib.analysis.FileProvider;
import com.google.devtools.build.lib.analysis.FilesToRunProvider;
import com.google.devtools.build.lib.analysis.RuleConfiguredTarget.Mode;
import com.google.devtools.build.lib.analysis.RuleConfiguredTargetBuilder;
import com.google.devtools.build.lib.analysis.RuleContext;
import com.google.devtools.build.lib.analysis.RunfilesProvider;
import com.google.devtools.build.lib.rules.RuleConfiguredTargetFactory;
import com.google.devtools.build.lib.syntax.Type;
import java.util.Map;
/** Defines a platform for execution contexts. */
public class Platform implements RuleConfiguredTargetFactory {
@Override
public ConfiguredTarget create(RuleContext ruleContext)
throws InterruptedException, RuleErrorException {
Iterable<ConstraintValueInfo> constraintValues =
ConstraintValueInfo.fromTargets(
ruleContext.getPrerequisites(PlatformRule.CONSTRAINT_VALUES_ATTR, Mode.DONT_CHECK));
// Verify the constraints - no two values for the same setting, and construct the map.
ImmutableMap<ConstraintSettingInfo, ConstraintValueInfo> constraints =
validateConstraints(ruleContext, constraintValues);
if (constraints == null) {
// An error occurred, return null.
return null;
}
PlatformInfo.Builder platformProviderBuilder = PlatformInfo.builder();
platformProviderBuilder.constraints(constraints.values());
Map<String, String> remoteExecutionProperties =
ruleContext.attributes().get(PlatformRule.REMOTE_EXECUTION_PROPS_ATTR, Type.STRING_DICT);
platformProviderBuilder.remoteExecutionProperties(remoteExecutionProperties);
return new RuleConfiguredTargetBuilder(ruleContext)
.addProvider(RunfilesProvider.class, RunfilesProvider.EMPTY)
.addProvider(FileProvider.class, FileProvider.EMPTY)
.addProvider(FilesToRunProvider.class, FilesToRunProvider.EMPTY)
.addNativeDeclaredProvider(platformProviderBuilder.build())
.build();
}
private ImmutableMap<ConstraintSettingInfo, ConstraintValueInfo> validateConstraints(
RuleContext ruleContext, Iterable<ConstraintValueInfo> constraintValues) {
Multimap<ConstraintSettingInfo, ConstraintValueInfo> constraints = ArrayListMultimap.create();
for (ConstraintValueInfo constraintValue : constraintValues) {
constraints.put(constraintValue.constraint(), constraintValue);
}
// Are there any settings with more than one value?
boolean foundError = false;
for (ConstraintSettingInfo constraintSetting : constraints.keySet()) {
if (constraints.get(constraintSetting).size() > 1) {
foundError = true;
// error
StringBuilder constraintValuesDescription = new StringBuilder();
for (ConstraintValueInfo constraintValue : constraints.get(constraintSetting)) {
if (constraintValuesDescription.length() > 0) {
constraintValuesDescription.append(", ");
}
constraintValuesDescription.append(constraintValue.label());
}
ruleContext.attributeError(
PlatformRule.CONSTRAINT_VALUES_ATTR,
String.format(
"Duplicate constraint_values for constraint_setting %s: %s",
constraintSetting.label(), constraintValuesDescription.toString()));
}
}
if (foundError) {
return null;
}
// Convert to a flat map.
ImmutableMap.Builder<ConstraintSettingInfo, ConstraintValueInfo> builder =
new ImmutableMap.Builder<>();
for (ConstraintSettingInfo constraintSetting : constraints.keySet()) {
ConstraintValueInfo constraintValue =
Iterables.getOnlyElement(constraints.get(constraintSetting));
builder.put(constraintSetting, constraintValue);
}
return builder.build();
}
}
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