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// Copyright 2015 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.base.Preconditions;
import com.google.common.collect.Interner;
import com.google.devtools.build.lib.cmdline.PackageIdentifier;
import com.google.devtools.build.lib.concurrent.BlazeInterners;
import com.google.devtools.build.lib.packages.BuildFileContainsErrorsException;
import com.google.devtools.build.lib.packages.BuildFileNotFoundException;
import com.google.devtools.build.lib.packages.NoSuchPackageException;
import com.google.devtools.build.lib.packages.Package;
import com.google.devtools.build.lib.skyframe.serialization.autocodec.AutoCodec;
import com.google.devtools.build.skyframe.AbstractSkyKey;
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.SkyFunctionName;
import com.google.devtools.build.skyframe.SkyKey;
import com.google.devtools.build.skyframe.SkyValue;
import javax.annotation.Nullable;
/**
* SkyFunction that throws a {@link BuildFileContainsErrorsException} for {@link Package} that
* loaded, but was in error. Must only be requested when a SkyFunction wishes to ignore the errors
* in a {@link Package} in keep_going mode, but to shut down the build in nokeep_going mode. Thus,
* this SkyFunction should only be requested when the corresponding {@link PackageFunction} has
* already been successfully called and the resulting Package contains an error.
*
* <p>This SkyFunction never returns a value, only throws a {@link BuildFileNotFoundException}, and
* should never return null, since all of its dependencies should already be present.
*/
public class PackageErrorFunction implements SkyFunction {
public static Key key(PackageIdentifier packageIdentifier) {
return Key.create(packageIdentifier);
}
@AutoCodec.VisibleForSerialization
@AutoCodec
static class Key extends AbstractSkyKey<PackageIdentifier> {
private static final Interner<Key> interner = BlazeInterners.newWeakInterner();
private Key(PackageIdentifier arg) {
super(arg);
}
@AutoCodec.VisibleForSerialization
@AutoCodec.Instantiator
static Key create(PackageIdentifier arg) {
return interner.intern(new Key(arg));
}
@Override
public SkyFunctionName functionName() {
return SkyFunctions.PACKAGE_ERROR;
}
}
@Nullable
@Override
public SkyValue compute(SkyKey skyKey, Environment env)
throws PackageErrorFunctionException, InterruptedException {
PackageIdentifier packageIdentifier = (PackageIdentifier) skyKey.argument();
try {
SkyKey packageKey = PackageValue.key(packageIdentifier);
// Callers must have tried to load the package already and gotten the package successfully.
Package pkg =
((PackageValue) env.getValueOrThrow(packageKey, NoSuchPackageException.class))
.getPackage();
Preconditions.checkState(pkg.containsErrors(), skyKey);
throw new PackageErrorFunctionException(
new BuildFileContainsErrorsException(packageIdentifier), Transience.PERSISTENT);
} catch (NoSuchPackageException e) {
throw new IllegalStateException(
"Function should not have been called on package with exception", e);
}
}
@Nullable
@Override
public String extractTag(SkyKey skyKey) {
return null;
}
private static class PackageErrorFunctionException extends SkyFunctionException {
public PackageErrorFunctionException(
BuildFileContainsErrorsException cause, Transience transience) {
super(cause, transience);
}
}
}
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