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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.android;
import com.google.auto.value.AutoValue;
import com.google.common.collect.ImmutableMap;
import com.google.devtools.build.lib.analysis.AliasProvider;
import com.google.devtools.build.lib.analysis.RuleConfiguredTarget.Mode;
import com.google.devtools.build.lib.analysis.RuleContext;
import com.google.devtools.build.lib.analysis.TransitiveInfoCollection;
import com.google.devtools.build.lib.analysis.TransitiveInfoProvider;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.concurrent.ThreadSafety.Immutable;
import com.google.devtools.build.lib.packages.BuildType;
import com.google.devtools.build.lib.packages.NonconfigurableAttributeMapper;
import com.google.devtools.build.lib.packages.RuleClass.ConfiguredTargetFactory.RuleErrorException;
import com.google.devtools.build.lib.rules.config.ConfigFeatureFlag;
import com.google.devtools.build.lib.rules.config.ConfigFeatureFlagProvider;
import java.util.Map;
/**
* Provider for checking the set of feature flags used by an android_binary.
*
* <p>Because the feature flags are completely replaced by android_binary, android_test uses this
* provider to ensure that the test sets the same flags as the binary. Otherwise, the dependencies
* of the android_test will be compiled with different flags from the android_binary code which runs
* in the same Android virtual machine, which may cause compatibility issues at runtime.
*/
@AutoValue
@Immutable
public abstract class AndroidFeatureFlagSetProvider implements TransitiveInfoProvider {
/** The name of the attribute used by Android rules to set config_feature_flags. */
public static final String FEATURE_FLAG_ATTR = "feature_flags";
AndroidFeatureFlagSetProvider() {}
/** Creates a new AndroidFeatureFlagSetProvider with the given flags. */
public static AndroidFeatureFlagSetProvider create(Map<Label, String> flags) {
return new AutoValue_AndroidFeatureFlagSetProvider(ImmutableMap.copyOf(flags));
}
/**
* Builds a map which can be used with create, confirming that the desired flag values were
* actually received, and producing an error if they were not (because dynamic configurations are
* not enabled, or because aliases were used).
*/
public static ImmutableMap<Label, String> getAndValidateFlagMapFromRuleContext(
RuleContext ruleContext) throws RuleErrorException {
Map<Label, String> expectedValues =
NonconfigurableAttributeMapper.of(ruleContext.getRule())
.get(FEATURE_FLAG_ATTR, BuildType.LABEL_KEYED_STRING_DICT);
if (expectedValues.isEmpty()) {
return ImmutableMap.of();
}
if (!ConfigFeatureFlag.isAvailable(ruleContext)) {
ruleContext.attributeError(
FEATURE_FLAG_ATTR,
String.format(
"the %s attribute is not available in package '%s'",
FEATURE_FLAG_ATTR,
ruleContext.getLabel().getPackageIdentifier()));
throw new RuleErrorException();
}
Iterable<? extends TransitiveInfoCollection> actualTargets =
ruleContext.getPrerequisites(FEATURE_FLAG_ATTR, Mode.TARGET);
boolean aliasFound = false;
for (TransitiveInfoCollection target : actualTargets) {
Label label = AliasProvider.getDependencyLabel(target);
if (!label.equals(target.getLabel())) {
ruleContext.attributeError(
FEATURE_FLAG_ATTR,
String.format(
"Feature flags must be named directly, not through aliases; use '%s', not '%s'",
target.getLabel(), label));
aliasFound = true;
}
String expectedValue = expectedValues.get(label);
String actualValue = ConfigFeatureFlagProvider.fromTarget(target).getValue();
if (!expectedValue.equals(actualValue)) {
// TODO(mstaib): when static configurations are removed, remove this error case
ruleContext.attributeError(
FEATURE_FLAG_ATTR,
"Setting " + FEATURE_FLAG_ATTR + " requires dynamic configurations to be enabled");
throw new RuleErrorException();
}
}
if (aliasFound) {
throw new RuleErrorException();
}
return ImmutableMap.copyOf(expectedValues);
}
public abstract ImmutableMap<Label, String> getFlags();
}
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