org.graylog.events.notifications.NotificationGracePeriodService Maven / Gradle / Ivy
/**
* This file is part of Graylog.
*
* Graylog is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Graylog is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Graylog. If not, see .
*/
package org.graylog.events.notifications;
import com.google.auto.value.AutoValue;
import com.google.common.base.Throwables;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import org.graylog.events.event.Event;
import org.graylog.events.processor.EventDefinition;
import org.joda.time.DateTime;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.inject.Inject;
import javax.inject.Singleton;
import java.time.Duration;
import java.util.Optional;
import java.util.concurrent.ExecutionException;
/**
* Checks the grace period of events at an early stage, to prevent creating unnecessary JobTriggers.
* This is an additional filter to {@link org.graylog.events.notifications.DBNotificationService}
*/
@Singleton
public class NotificationGracePeriodService {
private static final Logger LOG = LoggerFactory.getLogger(NotificationGracePeriodService.class);
// This is only used to limit the memory usage
private static final Duration CACHE_EXPIRY = Duration.ofMinutes(5);
@AutoValue
public static abstract class CacheKey {
public abstract String eventDefinitionId();
public abstract String notificationId();
public abstract String eventKey();
public static CacheKey create(String eventDefinitionId, String notificationId, String eventKey) {
return new AutoValue_NotificationGracePeriodService_CacheKey(eventDefinitionId, notificationId, eventKey);
}
}
private final LoadingCache> seenEvents;
@Inject
public NotificationGracePeriodService() {
seenEvents = CacheBuilder.newBuilder()
.expireAfterAccess(CACHE_EXPIRY)
.build(new CacheLoader>() {
@Override
public Optional load(CacheKey key) {
return Optional.ofNullable(null);
}
});
}
public boolean inGracePeriod(EventDefinition definition, String notificationId, Event event) {
if (definition.notificationSettings().gracePeriodMs() <= 0) {
return false;
}
final Optional lastEventTime = get(definition.id(), notificationId, event.toDto().key());
if (lastEventTime.isPresent()) {
return lastEventTime.get().isAfter(event.getEventTimestamp().minus(definition.notificationSettings().gracePeriodMs()));
}
put(definition.id(), notificationId, event.toDto().key(), event.getEventTimestamp());
return false;
}
private Optional get(String eventDefinitionId, String notificationId, String eventKey) {
try {
return seenEvents.get(new AutoValue_NotificationGracePeriodService_CacheKey(eventDefinitionId, notificationId, eventKey));
} catch (ExecutionException e) {
final Throwable rootCause = Throwables.getRootCause(e);
LOG.error("Unable to get seenEvent {}/{}/{} from cache", eventDefinitionId, notificationId, eventKey, rootCause);
throw new RuntimeException(rootCause);
}
}
private void put(String eventDefinitionId, String notificationId, String eventKey, DateTime time) {
seenEvents.put(new AutoValue_NotificationGracePeriodService_CacheKey(eventDefinitionId, notificationId, eventKey), Optional.of(time));
}
}