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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 com.google.common.collect.Sets;
import com.google.common.eventbus.Subscribe;
import com.google.devtools.build.lib.analysis.NoBuildEvent;
import com.google.devtools.build.lib.buildeventstream.AbortedEvent;
import com.google.devtools.build.lib.buildeventstream.BuildEvent;
import com.google.devtools.build.lib.buildeventstream.BuildEventId;
import com.google.devtools.build.lib.buildeventstream.BuildEventStreamProtos.Aborted.AbortReason;
import com.google.devtools.build.lib.buildeventstream.BuildEventTransport;
import com.google.devtools.build.lib.buildeventstream.ProgressEvent;
import com.google.devtools.build.lib.buildtool.buildevent.BuildCompleteEvent;
import com.google.devtools.build.lib.buildtool.buildevent.BuildInterruptedEvent;
import com.google.devtools.build.lib.events.Event;
import com.google.devtools.build.lib.events.EventHandler;
import java.io.IOException;
import java.util.Collection;
import java.util.HashSet;
import java.util.Set;
import java.util.logging.Logger;
/** Listen for {@link BuildEvent} and stream them to the provided {@link BuildEventTransport}. */
public class BuildEventStreamer implements EventHandler {
private final Collection<BuildEventTransport> transports;
private Set<BuildEventId> announcedEvents;
private Set<BuildEventId> postedEvents;
private int progressCount;
private AbortReason abortReason = AbortReason.UNKNOWN;
private static final Logger LOG = Logger.getLogger(BuildEventStreamer.class.getName());
public BuildEventStreamer(Collection<BuildEventTransport> transports) {
this.transports = transports;
this.announcedEvents = null;
this.postedEvents = null;
this.progressCount = 0;
}
/**
* Post a new event to all transports; simultaneously keep track of the events we announce to
* still come.
*
* <p>Moreover, link unannounced events to the progress stream; we only expect failure events to
* come before their parents.
*/
private void post(BuildEvent event) {
BuildEvent linkEvent = null;
BuildEventId id = event.getEventId();
synchronized (this) {
if (announcedEvents == null) {
announcedEvents = new HashSet<>();
postedEvents = new HashSet<>();
if (!event.getChildrenEvents().contains(ProgressEvent.INITIAL_PROGRESS_UPDATE)) {
linkEvent = ProgressEvent.progressChainIn(progressCount, event.getEventId());
progressCount++;
announcedEvents.addAll(linkEvent.getChildrenEvents());
postedEvents.add(linkEvent.getEventId());
}
} else {
if (!announcedEvents.contains(id)) {
linkEvent = ProgressEvent.progressChainIn(progressCount, id);
progressCount++;
announcedEvents.addAll(linkEvent.getChildrenEvents());
postedEvents.add(linkEvent.getEventId());
}
postedEvents.add(id);
}
announcedEvents.addAll(event.getChildrenEvents());
}
for (BuildEventTransport transport : transports) {
try {
if (linkEvent != null) {
transport.sendBuildEvent(linkEvent);
}
transport.sendBuildEvent(event);
} catch (IOException e) {
// TODO(aehlig): signal that the build ought to be aborted
LOG.severe("Failed to write to build event transport: " + e);
}
}
}
/**
* Clear all events that are still pending; events not naturally closed by the expected event
* normally only occur if the build is aborted.
*/
private void clearPendingEvents() {
if (announcedEvents != null) {
// create a copy of the identifiers to clear, as the post method
// will change the set of already announced events.
Set<BuildEventId> ids;
synchronized (this) {
ids = Sets.difference(announcedEvents, postedEvents);
}
for (BuildEventId id : ids) {
post(new AbortedEvent(id, abortReason, ""));
}
}
}
private void close() {
for (BuildEventTransport transport : transports) {
try {
transport.close();
} catch (IOException e) {
// TODO(aehlig): signal that the build ought to be aborted
LOG.warning("Failure while closing build event transport: " + e);
}
}
}
@Override
public void handle(Event event) {}
@Subscribe
public void noBuild(NoBuildEvent event) {
close();
}
@Subscribe
public void buildInterrupted(BuildInterruptedEvent event) {
abortReason = AbortReason.USER_INTERRUPTED;
};
@Subscribe
public void buildComplete(BuildCompleteEvent event) {
post(ProgressEvent.finalProgressUpdate(progressCount));
clearPendingEvents();
close();
}
@Subscribe
public void buildEvent(BuildEvent event) {
post(event);
}
}
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