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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.analysis.actions;
import com.google.common.collect.ImmutableList;
import com.google.devtools.build.lib.actions.ActionExecutionContext;
import com.google.devtools.build.lib.actions.EnvironmentalExecException;
import com.google.devtools.build.lib.actions.ExecException;
import com.google.devtools.build.lib.actions.ExecutionStrategy;
import com.google.devtools.build.lib.actions.SpawnResult;
import com.google.devtools.build.lib.analysis.actions.AbstractFileWriteAction.DeterministicWriter;
import com.google.devtools.build.lib.util.StringUtilities;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.charset.StandardCharsets;
import java.util.List;
/** Strategy to perform tempate expansion locally */
@ExecutionStrategy(
name = {"local"},
contextType = TemplateExpansionContext.class)
public class LocalTemplateExpansionStrategy implements TemplateExpansionContext {
public static final Class<LocalTemplateExpansionStrategy> TYPE =
LocalTemplateExpansionStrategy.class;
public static LocalTemplateExpansionStrategy INSTANCE = new LocalTemplateExpansionStrategy();
@Override
public List<SpawnResult> expandTemplate(
TemplateExpansionAction action, ActionExecutionContext ctx)
throws ExecException, InterruptedException {
try {
final String expandedTemplate = getExpandedTemplateUnsafe(action);
DeterministicWriter deterministicWriter =
new DeterministicWriter() {
@Override
public void writeOutputFile(OutputStream out) throws IOException {
out.write(expandedTemplate.getBytes(StandardCharsets.UTF_8));
}
};
ctx.getContext(FileWriteActionContext.class)
.writeOutputToFile(
action, ctx, deterministicWriter, action.makeExecutable(), /*isRemotable=*/ true);
} catch (IOException e) {
throw new EnvironmentalExecException("IOException during template expansion", e);
}
return ImmutableList.of();
}
/**
* Get the result of the template expansion prior to executing the action.
* TODO(b/110418949): Stop public access to this method as it's unhealthy to evaluate the
* action result without the action being executed.
*/
public String getExpandedTemplateUnsafe(TemplateExpansionAction action) throws IOException {
String templateString;
templateString = action.getTemplate().getContent();
for (Substitution entry : action.getSubstitutions()) {
templateString =
StringUtilities.replaceAllLiteral(templateString, entry.getKey(), entry.getValue());
}
return templateString;
}
}
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