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// Copyright 2016 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.runtime;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;
import static com.google.devtools.build.lib.buildeventstream.transports.BuildEventTransportFactory.createFromOptions;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Optional;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import com.google.common.eventbus.Subscribe;
import com.google.devtools.build.lib.buildeventstream.BuildEvent;
import com.google.devtools.build.lib.buildeventstream.BuildEventTransport;
import com.google.devtools.build.lib.buildeventstream.PathConverter;
import com.google.devtools.build.lib.buildeventstream.transports.BuildEventStreamOptions;
import com.google.devtools.build.lib.util.AbruptExitException;
import com.google.devtools.build.lib.util.ExitCode;
import com.google.devtools.build.lib.util.io.OutErr;
import com.google.devtools.build.lib.vfs.Path;
import com.google.devtools.common.options.OptionsBase;
import com.google.devtools.common.options.OptionsProvider;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
/** Module responsible for configuring BuildEventStreamer and transports. */
public class BuildEventStreamerModule extends BlazeModule {
private CommandEnvironment commandEnvironment;
private static class BuildEventRecorder {
private final List<BuildEvent> events = new ArrayList<>();
@Subscribe
public void buildEvent(BuildEvent event) {
events.add(event);
}
List<BuildEvent> getEvents() {
return events;
}
}
private BuildEventRecorder buildEventRecorder;
private SynchronizedOutputStream out;
private SynchronizedOutputStream err;
@Override
public Iterable<Class<? extends OptionsBase>> getCommandOptions(Command command) {
return ImmutableList.<Class<? extends OptionsBase>>of(BuildEventStreamOptions.class);
}
@Override
public void checkEnvironment(CommandEnvironment commandEnvironment) {
this.commandEnvironment = commandEnvironment;
this.buildEventRecorder = new BuildEventRecorder();
commandEnvironment.getEventBus().register(buildEventRecorder);
}
@Override
public OutErr getOutputListener() {
this.out = new SynchronizedOutputStream();
this.err = new SynchronizedOutputStream();
return OutErr.create(this.out, this.err);
}
@Override
public void handleOptions(OptionsProvider optionsProvider) {
checkState(commandEnvironment != null, "Methods called out of order");
Optional<BuildEventStreamer> maybeStreamer =
tryCreateStreamer(optionsProvider, commandEnvironment.getBlazeModuleEnvironment());
if (maybeStreamer.isPresent()) {
BuildEventStreamer streamer = maybeStreamer.get();
commandEnvironment.getReporter().addHandler(streamer);
commandEnvironment.getEventBus().register(streamer);
for (BuildEvent event : buildEventRecorder.getEvents()) {
streamer.buildEvent(event);
}
final SynchronizedOutputStream theOut = this.out;
final SynchronizedOutputStream theErr = this.err;
// out and err should be non-null at this point, as getOutputListener is supposed to
// be always called before handleOptions. But let's still prefer a stream with no
// stdout/stderr over an aborted build.
streamer.registerOutErrProvider(
new BuildEventStreamer.OutErrProvider() {
@Override
public String getOut() {
if (theOut == null) {
return null;
}
return theOut.readAndReset();
}
@Override
public String getErr() {
if (theErr == null) {
return null;
}
return theErr.readAndReset();
}
});
if (theErr != null) {
theErr.registerStreamer(streamer);
}
if (theOut != null) {
theOut.registerStreamer(streamer);
}
} else {
// If there is no streamer to consume the output, we should not try to accumulate it.
this.out.setDiscardAll();
this.err.setDiscardAll();
}
commandEnvironment.getEventBus().unregister(buildEventRecorder);
this.buildEventRecorder = null;
this.out = null;
this.err = null;
}
@VisibleForTesting
Optional<BuildEventStreamer> tryCreateStreamer(
OptionsProvider optionsProvider, ModuleEnvironment moduleEnvironment) {
try {
PathConverter pathConverter;
if (commandEnvironment == null) {
pathConverter = new PathConverter() {
@Override
public String apply(Path path) {
return path.getPathString();
}
};
} else {
pathConverter = commandEnvironment.getRuntime().getPathToUriConverter();
}
BuildEventStreamOptions besOptions =
checkNotNull(
optionsProvider.getOptions(BuildEventStreamOptions.class),
"Could not get BuildEventStreamOptions");
ImmutableSet<BuildEventTransport> buildEventTransports
= createFromOptions(besOptions, pathConverter);
if (!buildEventTransports.isEmpty()) {
BuildEventStreamer streamer = new BuildEventStreamer(buildEventTransports,
commandEnvironment != null ? commandEnvironment.getReporter() : null);
return Optional.of(streamer);
}
} catch (IOException e) {
moduleEnvironment.exit(new AbruptExitException(ExitCode.LOCAL_ENVIRONMENTAL_ERROR, e));
}
return Optional.absent();
}
}
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