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// Copyright 2018 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.bazel.repository;
import com.google.common.base.Strings;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import com.google.common.eventbus.Subscribe;
import com.google.common.flogger.GoogleLogger;
import com.google.common.io.Files;
import com.google.devtools.build.lib.bazel.ResolvedEvent;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.runtime.BlazeModule;
import com.google.devtools.build.lib.runtime.Command;
import com.google.devtools.build.lib.runtime.CommandEnvironment;
import com.google.devtools.build.lib.vfs.XattrProvider;
import com.google.devtools.common.options.OptionsBase;
import java.io.File;
import java.io.IOException;
import java.io.Writer;
import java.nio.charset.StandardCharsets;
import java.util.LinkedHashMap;
import java.util.Map;
import net.starlark.java.eval.Printer;
/** Module providing the collection of the resolved values for the repository rules executed. */
public final class RepositoryResolvedModule extends BlazeModule {
public static final String EXPORTED_NAME = "resolved";
private static final GoogleLogger logger = GoogleLogger.forEnclosingClass();
private Map<String, Object> resolvedValues;
private String resolvedFile;
private ImmutableList<String> orderedNames;
private XattrProvider xattrProvider;
@Override
public Iterable<Class<? extends OptionsBase>> getCommandOptions(Command command) {
return ImmutableSet.of("sync", "fetch", "build", "query").contains(command.name())
? ImmutableList.of(RepositoryResolvedOptions.class)
: ImmutableList.of();
}
@Override
public void beforeCommand(CommandEnvironment env) {
orderedNames = ImmutableList.of();
RepositoryResolvedOptions options =
env.getOptions().getOptions(RepositoryResolvedOptions.class);
if (options != null && !Strings.isNullOrEmpty(options.repositoryResolvedFile)) {
this.resolvedFile = options.repositoryResolvedFile;
env.getEventBus().register(this);
this.resolvedValues = new LinkedHashMap<>();
} else {
this.resolvedFile = null;
}
this.xattrProvider = env.getXattrProvider();
}
@Override
public void afterCommand() {
if (resolvedFile != null) {
ImmutableList.Builder<Object> resultBuilder = new ImmutableList.Builder<>();
// Fill the result builder; first all known repositories in order, then the
// rest in the order we knew about them.
for (String name : orderedNames) {
if (resolvedValues.containsKey(name)) {
resultBuilder.add(resolvedValues.get(name));
resolvedValues.remove(name);
}
}
for (Object resolved : resolvedValues.values()) {
resultBuilder.add(resolved);
}
try (Writer writer = Files.newWriter(new File(resolvedFile), StandardCharsets.UTF_8)) {
writer.write(EXPORTED_NAME + " = " + new ValuePrinter().repr(resultBuilder.build()));
} catch (IOException e) {
logger.atWarning().withCause(e).log("IO Error writing to file %s", resolvedFile);
}
}
this.resolvedValues = null;
}
@Subscribe
public void repositoryOrderEvent(RepositoryOrderEvent event) {
orderedNames = event.getOrderedNames();
}
@Subscribe
public void resolved(ResolvedEvent event) {
if (resolvedValues != null) {
resolvedValues.put(event.getName(), event.getResolvedInformation(xattrProvider));
}
}
// An printer of repository rule attribute values that inserts properly indented lines between
// sequence elements.
private static final class ValuePrinter extends Printer {
int indent = 0;
ValuePrinter() {
super(new StringBuilder());
}
@Override
public Printer repr(Object o) {
// In WORKSPACE files, the Label constructor is not available.
// Fortunately, in all places where a label is needed,
// we can pass the canonical string associated with this label.
if (o instanceof Label) {
return this.repr(((Label) o).getCanonicalForm());
}
return super.repr(o);
}
@Override
public Printer printList(Iterable<?> list, String before, String separator, String after) {
this.append(before);
indent++;
// If the list is empty, do not split the presentation over several lines.
String sep = null;
for (Object o : list) {
if (sep == null) { // first?
sep = separator.trim();
} else {
this.append(sep);
}
this.append("\n").append(" ".repeat(5 * indent)).repr(o);
}
indent--;
// Final indent, if nonempty.
if (sep != null) {
this.append("\n").append(" ".repeat(5 * indent));
}
return this.append(after);
}
}
}