| // 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.devtools.build.lib.actions.ActionExecutionContext; |
| import com.google.devtools.build.lib.actions.ArtifactPathResolver; |
| import com.google.devtools.build.lib.actions.EnvironmentalExecException; |
| import com.google.devtools.build.lib.actions.SpawnContinuation; |
| 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; |
| |
| /** Strategy to perform tempate expansion locally */ |
| public class LocalTemplateExpansionStrategy implements TemplateExpansionContext { |
| public static final Class<LocalTemplateExpansionStrategy> TYPE = |
| LocalTemplateExpansionStrategy.class; |
| |
| public static LocalTemplateExpansionStrategy INSTANCE = new LocalTemplateExpansionStrategy(); |
| |
| @Override |
| public SpawnContinuation expandTemplate( |
| TemplateExpansionAction action, ActionExecutionContext ctx) throws InterruptedException { |
| try { |
| final String expandedTemplate = getExpandedTemplateUnsafe(action, ctx.getPathResolver()); |
| DeterministicWriter deterministicWriter = |
| new DeterministicWriter() { |
| @Override |
| public void writeOutputFile(OutputStream out) throws IOException { |
| out.write(expandedTemplate.getBytes(StandardCharsets.UTF_8)); |
| } |
| }; |
| return ctx.getContext(FileWriteActionContext.class) |
| .beginWriteOutputToFile( |
| action, ctx, deterministicWriter, action.makeExecutable(), /*isRemotable=*/ true); |
| } catch (IOException e) { |
| return SpawnContinuation.failedWithExecException(new EnvironmentalExecException(e)); |
| } |
| } |
| |
| /** |
| * 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, |
| ArtifactPathResolver resolver) throws IOException { |
| String templateString; |
| templateString = action.getTemplate().getContent(resolver); |
| for (Substitution entry : action.getSubstitutions()) { |
| templateString = |
| StringUtilities.replaceAllLiteral(templateString, entry.getKey(), entry.getValue()); |
| } |
| return templateString; |
| } |
| } |