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// Copyright 2014 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.analysis.BlazeDirectories;
import com.google.devtools.build.lib.packages.Package.Builder;
import com.google.devtools.build.lib.packages.PackageFactory;
import com.google.devtools.build.lib.packages.RuleClassProvider;
import com.google.devtools.build.lib.packages.WorkspaceFactory;
import com.google.devtools.build.lib.syntax.EvalException;
import com.google.devtools.build.lib.syntax.Mutability;
import com.google.devtools.build.lib.syntax.ParserInputSource;
import com.google.devtools.build.lib.vfs.Path;
import com.google.devtools.build.lib.vfs.PathFragment;
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.SkyFunctionException.Transience;
import com.google.devtools.build.skyframe.SkyKey;
import com.google.devtools.build.skyframe.SkyValue;
import java.io.IOException;
/**
* A SkyFunction to parse WORKSPACE files.
*/
public class WorkspaceFileFunction implements SkyFunction {
private final PackageFactory packageFactory;
private final Path installDir;
private final RuleClassProvider ruleClassProvider;
public WorkspaceFileFunction(
RuleClassProvider ruleClassProvider,
PackageFactory packageFactory,
BlazeDirectories directories) {
this.packageFactory = packageFactory;
this.installDir = directories.getEmbeddedBinariesRoot();
this.ruleClassProvider = ruleClassProvider;
}
@Override
public SkyValue compute(SkyKey skyKey, Environment env) throws WorkspaceFileFunctionException,
InterruptedException {
RootedPath workspaceRoot = (RootedPath) skyKey.argument();
FileValue workspaceFileValue = (FileValue) env.getValue(FileValue.key(workspaceRoot));
if (workspaceFileValue == null) {
return null;
}
Path repoWorkspace = workspaceRoot.getRoot().getRelative(workspaceRoot.getRelativePath());
Builder builder =
com.google.devtools.build.lib.packages.Package.newExternalPackageBuilder(
repoWorkspace, packageFactory.getRuleClassProvider().getRunfilesPrefix());
try (Mutability mutability = Mutability.create("workspace %s", repoWorkspace)) {
WorkspaceFactory parser =
new WorkspaceFactory(
builder,
packageFactory.getRuleClassProvider(),
mutability,
installDir.getPathString());
parser.parse(
ParserInputSource.create(
ruleClassProvider.getDefaultWorkspaceFile(), new PathFragment("DEFAULT.WORKSPACE")));
if (!workspaceFileValue.exists()) {
return new PackageValue(builder.build());
}
try {
parser.parse(ParserInputSource.create(repoWorkspace, workspaceFileValue.getSize()));
} catch (IOException e) {
throw new WorkspaceFileFunctionException(e, Transience.TRANSIENT);
}
}
return new PackageValue(builder.build());
}
@Override
public String extractTag(SkyKey skyKey) {
return null;
}
private static final class WorkspaceFileFunctionException extends SkyFunctionException {
public WorkspaceFileFunctionException(IOException e, Transience transience) {
super(e, transience);
}
public WorkspaceFileFunctionException(EvalException e) {
super(e, Transience.PERSISTENT);
}
}
}
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