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/**
* 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.graylog2.indexer.rotation.strategies;
import com.google.common.base.MoreObjects;
import org.graylog2.indexer.Deflector;
import org.graylog2.indexer.indices.Indices;
import org.graylog2.plugin.Tools;
import org.graylog2.plugin.cluster.ClusterConfigService;
import org.graylog2.plugin.indexer.rotation.RotationStrategyConfig;
import org.joda.time.DateTime;
import org.joda.time.DateTimeField;
import org.joda.time.DateTimeFieldType;
import org.joda.time.DateTimeZone;
import org.joda.time.Period;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.inject.Inject;
import javax.inject.Singleton;
import java.text.MessageFormat;
import static org.joda.time.DateTimeFieldType.dayOfMonth;
import static org.joda.time.DateTimeFieldType.hourOfDay;
import static org.joda.time.DateTimeFieldType.minuteOfHour;
import static org.joda.time.DateTimeFieldType.monthOfYear;
import static org.joda.time.DateTimeFieldType.secondOfMinute;
import static org.joda.time.DateTimeFieldType.weekOfWeekyear;
import static org.joda.time.DateTimeFieldType.year;
@Singleton
public class TimeBasedRotationStrategy extends AbstractRotationStrategy {
private static final Logger log = LoggerFactory.getLogger(TimeBasedRotationStrategy.class);
private final Indices indices;
private final ClusterConfigService clusterConfigService;
private DateTime lastRotation;
private DateTime anchor;
@Inject
public TimeBasedRotationStrategy(Indices indices, Deflector deflector, ClusterConfigService clusterConfigService) {
super(deflector);
this.clusterConfigService = clusterConfigService;
this.anchor = null;
this.lastRotation = null;
this.indices = indices;
}
@Override
public Class configurationClass() {
return TimeBasedRotationStrategyConfig.class;
}
@Override
public RotationStrategyConfig defaultConfiguration() {
return TimeBasedRotationStrategyConfig.createDefault();
}
/**
* Determines the starting point ("anchor") for a period.
*
* To produce repeatable rotation points in time, the period is "snapped" to a "grid" of time.
* For example, an hourly index rotation would be anchored to the last full hour, instead of happening at whatever minute
* the first rotation was started.
*
* This "snapping" is done accordingly with the other parts of a period.
*
* For highly irregular periods (those that do not have a small zero component)
*
* @param period the rotation period
* @return the anchor DateTime to calculate rotation periods from
*/
protected static DateTime determineRotationPeriodAnchor(@Nullable DateTime lastAnchor, Period period) {
final Period normalized = period.normalizedStandard();
int years = normalized.getYears();
int months = normalized.getMonths();
int weeks = normalized.getWeeks();
int days = normalized.getDays();
int hours = normalized.getHours();
int minutes = normalized.getMinutes();
int seconds = normalized.getSeconds();
if (years == 0 && months == 0 && weeks == 0 && days == 0 && hours == 0 && minutes == 0 && seconds == 0) {
throw new IllegalArgumentException("Invalid rotation period specified");
}
// find the largest non-zero stride in the period. that's our anchor type. statement order matters here!
DateTimeFieldType largestStrideType = null;
if (seconds > 0) largestStrideType = secondOfMinute();
if (minutes > 0) largestStrideType = minuteOfHour();
if (hours > 0) largestStrideType = hourOfDay();
if (days > 0) largestStrideType = dayOfMonth();
if (weeks > 0) largestStrideType = weekOfWeekyear();
if (months > 0) largestStrideType = monthOfYear();
if (years > 0) largestStrideType = year();
if (largestStrideType == null) {
throw new IllegalArgumentException("Could not determine rotation stride length.");
}
final DateTime anchorTime = MoreObjects.firstNonNull(lastAnchor, Tools.nowUTC());
final DateTimeField field = largestStrideType.getField(anchorTime.getChronology());
// use normalized here to make sure we actually have the largestStride type available! see https://github.com/Graylog2/graylog2-server/issues/836
int periodValue = normalized.get(largestStrideType.getDurationType());
final long fieldValue = field.roundFloor(anchorTime.getMillis());
final int fieldValueInUnit = field.get(fieldValue);
if (periodValue == 0) {
// https://github.com/Graylog2/graylog2-server/issues/836
log.warn("Determining stride length failed because of a 0 period. Defaulting back to 1 period to avoid crashing, but this is a bug!");
periodValue = 1;
}
final long difference = (fieldValueInUnit % periodValue);
final long newValue = field.add(fieldValue, -1 * difference);
return new DateTime(newValue, DateTimeZone.UTC);
}
@Nonnull
@Override
protected Result shouldRotate(String index) {
final TimeBasedRotationStrategyConfig config = clusterConfigService.get(TimeBasedRotationStrategyConfig.class);
if (config == null) {
log.warn("No rotation strategy configuration found, not running index rotation!");
return null;
}
final Period rotationPeriod = config.rotationPeriod().normalizedStandard();
final DateTime now = Tools.nowUTC();
// when first started, we might not know the last rotation time, look up the creation time of the index instead.
if (lastRotation == null) {
lastRotation = indices.indexCreationDate(index);
anchor = determineRotationPeriodAnchor(lastRotation, rotationPeriod);
// still not able to figure out the last rotation time, we'll rotate forcibly
if (lastRotation == null) {
return new SimpleResult(true, "No known previous rotation time, forcing index rotation now.");
}
}
final DateTime nextRotation = anchor.plus(rotationPeriod);
if (nextRotation.isAfter(now)) {
return new SimpleResult(false, MessageFormat.format("Next rotation at {0}", nextRotation));
}
// determine new anchor (push it to within less then one period before now) in case we missed one or more periods
DateTime tmpAnchor;
int multiplicator = 0;
do {
tmpAnchor = anchor.withPeriodAdded(rotationPeriod, ++multiplicator);
} while (tmpAnchor.isBefore(now));
anchor = anchor.withPeriodAdded(rotationPeriod, multiplicator - 1);
lastRotation = now;
return new SimpleResult(true, MessageFormat.format("Rotation period {0} elapsed, next rotation at {1}", rotationPeriod, anchor));
}
private static class SimpleResult implements AbstractRotationStrategy.Result {
private final String message;
private final boolean rotate;
public SimpleResult(boolean rotate, String message) {
this.message = message;
this.rotate = rotate;
log.debug("{} because of: {}", rotate ? "Rotating" : "Not rotating", message);
}
@Override
public String getDescription() {
return message;
}
@Override
public boolean shouldRotate() {
return rotate;
}
}
}
