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Lennart Koopmann
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,160 @@ | ||
| /** | ||
| * Copyright 2012 Lennart Koopmann <lennart@socketfeed.com> | ||
| * | ||
| * This file is part of Graylog2. | ||
| * | ||
| * Graylog2 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. | ||
| * | ||
| * Graylog2 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 Graylog2. If not, see <http://www.gnu.org/licenses/>. | ||
| * | ||
| */ | ||
| package org.graylog2.indexer; | ||
|
|
||
| import java.util.ArrayList; | ||
| import java.util.Collections; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
| import java.util.logging.Level; | ||
| import org.apache.log4j.Logger; | ||
| import org.elasticsearch.action.admin.indices.stats.IndexStats; | ||
| import org.graylog2.GraylogServer; | ||
|
|
||
| /** | ||
| * | ||
| * Format of actual indexes behind the Deflector: | ||
| * [configured_prefix]_1 | ||
| * [configured_prefix]_2 | ||
| * [configured_prefix]_3 | ||
| * ... | ||
| * | ||
| * @author Lennart Koopmann <lennart@socketfeed.com> | ||
| */ | ||
| public class Deflector { | ||
|
|
||
| private static final Logger LOG = Logger.getLogger(Deflector.class); | ||
|
|
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| public static final String DEFLECTOR_NAME = "graylog2_deflector"; | ||
|
|
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| GraylogServer server; | ||
|
|
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| public Deflector(GraylogServer server) { | ||
| this.server = server; | ||
| } | ||
|
|
||
| public boolean isUp() { | ||
| return this.server.getIndexer().indexExists(DEFLECTOR_NAME); | ||
| } | ||
|
|
||
| public void setUp() { | ||
| // Check if there already is an deflector index pointing somewhere. | ||
| if (isUp()) { | ||
| LOG.info("Found deflector alias <" + DEFLECTOR_NAME + ">. Using it."); | ||
| } else { | ||
| LOG.info("Did not find an deflector alias. Setting one up now."); | ||
|
|
||
| // Do we have a target index to point to? | ||
| try { | ||
| String currentTarget = getCurrentTargetName(); | ||
| LOG.info("Pointing to already existing index target <" + currentTarget + ">"); | ||
| pointTo(currentTarget); | ||
| } catch(NoTargetIndexException ex) { | ||
| LOG.info("There is no index target to point to. Creating one now."); | ||
| cycle(); // No index, so automatically cycling to 0. | ||
| } | ||
| } | ||
| } | ||
|
|
||
| public void cycle() { | ||
| LOG.info("Cycling deflector to next index now."); | ||
| int oldTargetNumber; | ||
|
|
||
| try { | ||
| oldTargetNumber = getCurrentTargetNumber(); | ||
| } catch (NoTargetIndexException ex) { | ||
| oldTargetNumber = -1; | ||
| } | ||
|
|
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| int newTargetNumber = oldTargetNumber+1; | ||
|
|
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| String newTarget = buildIndexName(server.getConfiguration().getElasticSearchIndexPrefix(), newTargetNumber); | ||
| String oldTarget = buildIndexName(server.getConfiguration().getElasticSearchIndexPrefix(), oldTargetNumber); | ||
|
|
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| LOG.info("Cycling from <" + oldTarget + "> to <" + newTarget + ">"); | ||
|
|
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| // Create new index. | ||
| LOG.info("Creating index target <" + newTarget + ">..."); | ||
| server.getIndexer().createIndex(newTarget); | ||
| LOG.info("Done!"); | ||
|
|
||
| // Point to deflector to new index. | ||
| LOG.info("Pointing deflector to new target index...."); | ||
| if (oldTargetNumber == -1) { | ||
| // Only poiting, not cycling. | ||
| pointTo(newTarget); | ||
| } else { | ||
| // Re-poiting from existing old index to the new one. | ||
| pointTo(newTarget, oldTarget); | ||
| } | ||
| LOG.info("Done!"); | ||
| } | ||
|
|
||
| public int getCurrentTargetNumber() throws NoTargetIndexException { | ||
| Map<String, IndexStats> indexes = this.server.getIndexer().getIndices(); | ||
| if (indexes.isEmpty()) { | ||
| throw new NoTargetIndexException(); | ||
| } | ||
|
|
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| List<Integer> indexNumbers = new ArrayList<Integer>(); | ||
|
|
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| for(Map.Entry<String, IndexStats> e : indexes.entrySet()) { | ||
| try { | ||
| indexNumbers.add(extractIndexNumber(e.getKey())); | ||
| } catch (NumberFormatException ex) { | ||
| continue; | ||
| } | ||
| } | ||
|
|
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| if (indexNumbers.isEmpty()) { | ||
| throw new NoTargetIndexException(); | ||
| } | ||
|
|
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| return Collections.max(indexNumbers); | ||
| } | ||
|
|
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| public String getCurrentTargetName() throws NoTargetIndexException { | ||
| return buildIndexName(this.server.getConfiguration().getElasticSearchIndexPrefix(), getCurrentTargetNumber()); | ||
| } | ||
|
|
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| public String buildIndexName(String prefix, int number) { | ||
| return prefix + "_" + number; | ||
| } | ||
|
|
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| public int extractIndexNumber(String indexName) throws NumberFormatException { | ||
| String[] parts = indexName.split("_"); | ||
|
|
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| try { | ||
| return Integer.parseInt(parts[parts.length-1]); | ||
| } catch(Exception e) { | ||
| LOG.debug("Could not extract index number from index <" + indexName + ">."); | ||
| throw new NumberFormatException(); | ||
| } | ||
| } | ||
|
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| private void pointTo(String newIndex, String oldIndex) { | ||
| server.getIndexer().cycleAlias(DEFLECTOR_NAME, newIndex, oldIndex); | ||
| } | ||
|
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| private void pointTo(String newIndex) { | ||
| server.getIndexer().cycleAlias(DEFLECTOR_NAME, newIndex); | ||
| } | ||
|
|
||
| } |
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