/**
* 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.filters;
import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import com.google.common.collect.Lists;
import com.google.inject.Inject;
import org.graylog2.inputs.Input;
import org.graylog2.inputs.InputService;
import org.graylog2.plugin.Message;
import org.graylog2.plugin.filters.MessageFilter;
import org.graylog2.plugin.inputs.Extractor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
/**
* @author Lennart Koopmann <lennart@torch.sh>
*/
public class ExtractorFilter implements MessageFilter {
private static final Logger LOG = LoggerFactory.getLogger(ExtractorFilter.class);
private static final String NAME = "Extractor";
private Cache<String, List<Extractor>> cache = CacheBuilder.newBuilder()
.expireAfterWrite(1, TimeUnit.SECONDS)
.build();
private final InputService inputService;
@Inject
public ExtractorFilter(InputService inputService) {
this.inputService = inputService;
}
@Override
public boolean filter(Message msg) {
if (msg.getSourceInput() == null) {
return false;
}
for (Extractor extractor : loadExtractors(msg.getSourceInput().getId())) {
try {
extractor.runExtractor(msg);
} catch (Exception e) {
extractor.incrementExceptions();
LOG.error("Could not apply extractor.", e);
continue;
}
}
return false;
}
private List<Extractor> loadExtractors(final String inputId) {
try {
return cache.get(inputId, new Callable<List<Extractor>>() {
@Override
public List<Extractor> call() throws Exception {
LOG.debug("Re-loading extractors for input <{}> into cache.", inputId);
Input input = inputService.find(inputId);
List<Extractor> sorted = Lists.newArrayList(inputService.getExtractors(input));
Collections.sort(sorted, new Comparator<Extractor>() {
public int compare(Extractor e1, Extractor e2) {
return e1.getOrder().intValue() - e2.getOrder().intValue();
}
});
return sorted;
}
});
} catch (ExecutionException e) {
LOG.error("Could not load extractors into cache. Returning empty list.", e);
return Collections.emptyList();
}
}
@Override
public String getName() {
return NAME;
}
@Override
public int getPriority() {
// runs first of the built-in filters
return 10;
}
}