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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.skyframe;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.events.Event;
import com.google.devtools.build.lib.packages.BuildFileContainsErrorsException;
import com.google.devtools.build.lib.packages.NoSuchPackageException;
import com.google.devtools.build.lib.packages.Package;
import com.google.devtools.build.lib.vfs.RootedPath;
import com.google.devtools.build.skyframe.SkyFunction;
import com.google.devtools.build.skyframe.SkyFunctionException;
import com.google.devtools.build.skyframe.SkyKey;
import com.google.devtools.build.skyframe.SkyValue;
import javax.annotation.Nullable;
/**
* {@link SkyFunction} for {@link WorkspaceNameValue}s.
*
* <p>All errors (e.g. parsing errors or a symlink cycle encountered when consuming the WORKSPACE
* file) result in a {@link NoSuchPackageException}.
*/
public class WorkspaceNameFunction implements SkyFunction {
@Override
@Nullable
public SkyValue compute(SkyKey skyKey, Environment env)
throws InterruptedException, WorkspaceNameFunctionException {
boolean firstChunk = (boolean) skyKey.argument();
Package externalPackage = firstChunk ? firstChunk(env) : parseFullPackage(env);
if (externalPackage == null) {
return null;
}
if (externalPackage.containsErrors()) {
Event.replayEventsOn(env.getListener(), externalPackage.getEvents());
throw new WorkspaceNameFunctionException();
}
return WorkspaceNameValue.withName(externalPackage.getWorkspaceName());
}
/**
* This just examines the first chunk of the WORKSPACE file to avoid circular dependencies and
* overeager invalidation during package loading.
*/
private Package firstChunk(Environment env) throws InterruptedException {
SkyKey packageLookupKey = PackageLookupValue.key(Label.EXTERNAL_PACKAGE_IDENTIFIER);
PackageLookupValue packageLookupValue = (PackageLookupValue) env.getValue(packageLookupKey);
if (packageLookupValue == null) {
return null;
}
RootedPath workspacePath = packageLookupValue.getRootedPath(Label.EXTERNAL_PACKAGE_IDENTIFIER);
SkyKey workspaceKey = WorkspaceFileValue.key(workspacePath);
WorkspaceFileValue value = (WorkspaceFileValue) env.getValue(workspaceKey);
if (value == null) {
return null;
}
return value.getPackage();
}
private Package parseFullPackage(Environment env) throws InterruptedException {
SkyKey externalPackageKey = PackageValue.key(Label.EXTERNAL_PACKAGE_IDENTIFIER);
PackageValue externalPackageValue = (PackageValue) env.getValue(externalPackageKey);
if (externalPackageValue == null) {
return null;
}
return externalPackageValue.getPackage();
}
@Override
@Nullable
public String extractTag(SkyKey skyKey) {
return null;
}
private class WorkspaceNameFunctionException extends SkyFunctionException {
WorkspaceNameFunctionException() {
super(new BuildFileContainsErrorsException(Label.EXTERNAL_PACKAGE_IDENTIFIER),
Transience.PERSISTENT);
}
}
}
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