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// Copyright 2016 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.objc;
import com.google.common.collect.Iterables;
import com.google.devtools.build.lib.actions.Artifact;
import com.google.devtools.build.lib.actions.MutableActionGraph.ActionConflictException;
import com.google.devtools.build.lib.analysis.ConfiguredAspect;
import com.google.devtools.build.lib.analysis.ConfiguredAspectFactory;
import com.google.devtools.build.lib.analysis.PrerequisiteArtifacts;
import com.google.devtools.build.lib.analysis.RuleContext;
import com.google.devtools.build.lib.analysis.configuredtargets.RuleConfiguredTarget.Mode;
import com.google.devtools.build.lib.collect.nestedset.NestedSet;
import com.google.devtools.build.lib.collect.nestedset.NestedSetBuilder;
import com.google.devtools.build.lib.collect.nestedset.Order;
import com.google.devtools.build.lib.packages.AspectDefinition;
import com.google.devtools.build.lib.packages.AspectParameters;
import com.google.devtools.build.lib.packages.BuildType;
import com.google.devtools.build.lib.packages.SkylarkNativeAspect;
import com.google.devtools.build.lib.rules.proto.ProtoSourcesProvider;
import com.google.devtools.build.lib.skyframe.ConfiguredTargetAndData;
/**
* Aspect that gathers the proto dependencies of the attached rule target, and propagates the proto
* values of its dependencies through the ObjcProtoProvider.
*/
public class ObjcProtoAspect extends SkylarkNativeAspect implements ConfiguredAspectFactory {
public static final String NAME = "ObjcProtoAspect";
@Override
public AspectDefinition getDefinition(AspectParameters aspectParameters) {
return new AspectDefinition.Builder(this)
.propagateAlongAttribute("deps")
.build();
}
@Override
public ConfiguredAspect create(
ConfiguredTargetAndData ctadBase, RuleContext ruleContext, AspectParameters parameters)
throws InterruptedException, ActionConflictException {
ConfiguredAspect.Builder aspectBuilder = new ConfiguredAspect.Builder(
this, parameters, ruleContext);
ObjcProtoProvider.Builder aspectObjcProtoProvider = new ObjcProtoProvider.Builder();
if (ruleContext.attributes().has("deps", BuildType.LABEL_LIST)) {
Iterable<ObjcProtoProvider> depObjcProtoProviders =
ruleContext.getPrerequisites("deps", Mode.TARGET, ObjcProtoProvider.SKYLARK_CONSTRUCTOR);
aspectObjcProtoProvider.addTransitive(depObjcProtoProviders);
}
ProtoAttributes attributes = new ProtoAttributes(ruleContext);
// If this current target is an objc_proto_library, only then read the protos and portable
// filters it has configured in the attributes and add them to the ObjcProtoProvider.Builder
// instance. Validation for the correct target attributes is already done in ProtoSupport.java.
if (attributes.isObjcProtoLibrary()) {
// Gather up all the dependency protos depended by this target.
Iterable<ProtoSourcesProvider> protoProviders =
ruleContext.getPrerequisites("deps", Mode.TARGET, ProtoSourcesProvider.class);
for (ProtoSourcesProvider protoProvider : protoProviders) {
aspectObjcProtoProvider.addProtoGroup(protoProvider.getTransitiveProtoSources());
}
NestedSet<Artifact> portableProtoFilters =
PrerequisiteArtifacts.nestedSet(
ruleContext, ObjcProtoLibraryRule.PORTABLE_PROTO_FILTERS_ATTR, Mode.HOST);
// If this target does not provide filters but specifies direct proto_library dependencies,
// generate a filter file only for those proto files.
if (Iterables.isEmpty(portableProtoFilters) && !Iterables.isEmpty(protoProviders)) {
Artifact generatedFilter =
ProtobufSupport.getGeneratedPortableFilter(ruleContext, ruleContext.getConfiguration());
ProtobufSupport.registerPortableFilterGenerationAction(
ruleContext,
generatedFilter,
protoProviders);
portableProtoFilters = NestedSetBuilder.create(Order.STABLE_ORDER, generatedFilter);
}
aspectObjcProtoProvider.addPortableProtoFilters(portableProtoFilters);
// Propagate protobuf's headers and search paths so the BinaryLinkingTargetFactory subclasses
// (i.e. objc_binary) don't have to depend on it.
ObjcProvider protobufObjcProvider =
ruleContext.getPrerequisite(
ObjcRuleClasses.PROTO_LIB_ATTR, Mode.TARGET, ObjcProvider.SKYLARK_CONSTRUCTOR);
aspectObjcProtoProvider.addProtobufHeaders(protobufObjcProvider.get(ObjcProvider.HEADER));
aspectObjcProtoProvider.addProtobufHeaderSearchPaths(
protobufObjcProvider.get(ObjcProvider.INCLUDE));
}
// Only add the provider if it has any values, otherwise skip it.
if (!aspectObjcProtoProvider.isEmpty()) {
aspectBuilder.addNativeDeclaredProvider(aspectObjcProtoProvider.build());
}
return aspectBuilder.build();
}
@Override
public String getName() {
return NAME;
}
}
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