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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.annotations.VisibleForTesting;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import com.google.devtools.build.lib.actions.ActionExecutionContext;
import com.google.devtools.build.lib.actions.ActionKeyContext;
import com.google.devtools.build.lib.actions.ActionOwner;
import com.google.devtools.build.lib.actions.Artifact;
import com.google.devtools.build.lib.actions.Artifact.ArtifactExpander;
import com.google.devtools.build.lib.actions.CommandLine;
import com.google.devtools.build.lib.actions.CommandLineExpansionException;
import com.google.devtools.build.lib.actions.ExecException;
import com.google.devtools.build.lib.actions.ParameterFile;
import com.google.devtools.build.lib.actions.ParameterFile.ParameterFileType;
import com.google.devtools.build.lib.actions.UserExecException;
import com.google.devtools.build.lib.concurrent.ThreadSafety.Immutable;
import com.google.devtools.build.lib.skyframe.serialization.autocodec.AutoCodec;
import com.google.devtools.build.lib.skyframe.serialization.autocodec.AutoCodec.VisibleForSerialization;
import com.google.devtools.build.lib.util.Fingerprint;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.charset.Charset;
/** Action to write a parameter file for a {@link CommandLine}. */
@Immutable // if commandLine and charset are immutable
@AutoCodec
public final class ParameterFileWriteAction extends AbstractFileWriteAction {
private static final String GUID = "45f678d8-e395-401e-8446-e795ccc6361f";
private final CommandLine commandLine;
private final ParameterFileType type;
private final Charset charset;
private final boolean hasInputArtifactToExpand;
/**
* Creates a new instance.
*
* @param owner the action owner
* @param output the Artifact that will be created by executing this Action
* @param commandLine the contents to be written to the file
* @param type the type of the file
* @param charset the charset of the file
*/
public ParameterFileWriteAction(ActionOwner owner, Artifact output, CommandLine commandLine,
ParameterFileType type, Charset charset) {
this(owner, ImmutableList.<Artifact>of(), output, commandLine, type, charset);
}
/**
* Creates a new instance.
*
* @param owner the action owner
* @param inputs the list of TreeArtifacts that must be resolved and expanded before evaluating
* the contents of {@link CommandLine}.
* @param output the Artifact that will be created by executing this Action
* @param commandLine the contents to be written to the file
* @param type the type of the file
* @param charset the charset of the file
*/
@AutoCodec.Instantiator
public ParameterFileWriteAction(
ActionOwner owner,
Iterable<Artifact> inputs,
Artifact output,
CommandLine commandLine,
ParameterFileType type,
Charset charset) {
super(owner, inputs, output, false);
this.commandLine = commandLine;
this.type = type;
this.charset = charset;
this.hasInputArtifactToExpand = !Iterables.isEmpty(inputs);
}
@VisibleForTesting
public CommandLine getCommandLine() {
return commandLine;
}
/**
* Returns the list of options written to the parameter file. Don't use this method outside tests
* - the list is often huge, resulting in significant garbage collection overhead.
*/
@VisibleForTesting
public Iterable<String> getArguments() throws CommandLineExpansionException {
Preconditions.checkState(
!hasInputArtifactToExpand,
"This action contains a CommandLine with TreeArtifacts: %s, which must be expanded using "
+ "ArtifactExpander first before we can evaluate the CommandLine.",
getInputs());
return commandLine.arguments();
}
@VisibleForTesting
public String getStringContents() throws CommandLineExpansionException, IOException {
ByteArrayOutputStream out = new ByteArrayOutputStream();
ParameterFile.writeParameterFile(out, getArguments(), type, charset);
return new String(out.toByteArray(), charset);
}
@Override
public DeterministicWriter newDeterministicWriter(ActionExecutionContext ctx)
throws ExecException {
final Iterable<String> arguments;
try {
ArtifactExpander artifactExpander = Preconditions.checkNotNull(ctx.getArtifactExpander());
arguments = commandLine.arguments(artifactExpander);
} catch (CommandLineExpansionException e) {
throw new UserExecException(e);
}
return new ParamFileWriter(arguments, type, charset);
}
@VisibleForSerialization
Artifact getOutput() {
return Iterables.getOnlyElement(outputs);
}
private static class ParamFileWriter implements DeterministicWriter {
private final Iterable<String> arguments;
private final ParameterFileType type;
private final Charset charset;
ParamFileWriter(Iterable<String> arguments, ParameterFileType type, Charset charset) {
this.arguments = arguments;
this.type = type;
this.charset = charset;
}
@Override
public void writeOutputFile(OutputStream out) throws IOException {
ParameterFile.writeParameterFile(out, arguments, type, charset);
}
}
@Override
protected void computeKey(ActionKeyContext actionKeyContext, Fingerprint fp)
throws CommandLineExpansionException {
fp.addString(GUID);
fp.addString(String.valueOf(makeExecutable));
fp.addString(type.toString());
fp.addString(charset.toString());
commandLine.addToFingerprint(actionKeyContext, fp);
}
}
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