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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.alerts.types;
import com.google.common.collect.Lists;
import com.google.inject.assistedinject.Assisted;
import com.google.inject.assistedinject.AssistedInject;
import org.graylog2.Configuration;
import org.graylog2.alerts.AbstractAlertCondition;
import org.graylog2.indexer.InvalidRangeFormatException;
import org.graylog2.indexer.results.ResultMessage;
import org.graylog2.indexer.results.SearchResult;
import org.graylog2.indexer.searches.Searches;
import org.graylog2.indexer.searches.Sorting;
import org.graylog2.plugin.Message;
import org.graylog2.plugin.MessageSummary;
import org.graylog2.plugin.Tools;
import org.graylog2.plugin.alarms.AlertCondition;
import org.graylog2.plugin.configuration.ConfigurationRequest;
import org.graylog2.plugin.configuration.fields.ConfigurationField;
import org.graylog2.plugin.configuration.fields.TextField;
import org.graylog2.plugin.indexer.searches.timeranges.InvalidRangeParametersException;
import org.graylog2.plugin.indexer.searches.timeranges.RelativeRange;
import org.graylog2.plugin.streams.Stream;
import org.joda.time.DateTime;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.annotation.Nullable;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Strings.isNullOrEmpty;
public class FieldContentValueAlertCondition extends AbstractAlertCondition {
private static final Logger LOG = LoggerFactory.getLogger(FieldContentValueAlertCondition.class);
private final Searches searches;
private final Configuration configuration;
private final String field;
private final String value;
public interface Factory extends AlertCondition.Factory {
FieldContentValueAlertCondition create(Stream stream,
@Assisted("id") String id,
DateTime createdAt,
@Assisted("userid") String creatorUserId,
Map parameters,
@Assisted("title") @Nullable String title);
Config config();
Descriptor descriptor();
}
public static class Config implements AlertCondition.Config {
public Config() {
}
@Override
public ConfigurationRequest getRequestedConfiguration() {
return ConfigurationRequest.createWithFields(
new TextField("field", "Field", "", "Field name that should be checked", ConfigurationField.Optional.NOT_OPTIONAL),
new TextField("value", "Value", "", "Value that the field should be checked against", ConfigurationField.Optional.NOT_OPTIONAL)
).addFields(AbstractAlertCondition.getDefaultConfigurationFields());
}
}
public static class Descriptor extends AlertCondition.Descriptor {
public Descriptor() {
super(
"Field Content Value Alert Condition",
"https://www.graylog.org/",
"This condition is triggered when the aggregated value of a field is higher/lower than a defined "
+ "threshold for a given time range."
);
}
}
@AssistedInject
public FieldContentValueAlertCondition(Searches searches,
Configuration configuration,
@Assisted Stream stream,
@Nullable @Assisted("id") String id,
@Assisted DateTime createdAt,
@Assisted("userid") String creatorUserId,
@Assisted Map parameters,
@Assisted("title") @Nullable String title) {
super(stream, id, Type.FIELD_CONTENT_VALUE.toString(), createdAt, creatorUserId, parameters, title);
this.searches = searches;
this.configuration = configuration;
this.field = (String) parameters.get("field");
this.value = (String) parameters.get("value");
checkArgument(!isNullOrEmpty(field), "\"field\" must not be empty.");
checkArgument(!isNullOrEmpty(value), "\"value\" must not be empty.");
}
@Override
public CheckResult runCheck() {
String filter = "streams:" + stream.getId();
String query = field + ":\"" + value + "\"";
Integer backlogSize = getBacklog();
boolean backlogEnabled = false;
int searchLimit = 1;
if(backlogSize != null && backlogSize > 0) {
backlogEnabled = true;
searchLimit = backlogSize;
}
try {
SearchResult result = searches.search(
query,
filter,
RelativeRange.create(configuration.getAlertCheckInterval()),
searchLimit,
0,
new Sorting("timestamp", Sorting.Direction.DESC)
);
final List summaries;
if (backlogEnabled) {
summaries = Lists.newArrayListWithCapacity(result.getResults().size());
for (ResultMessage resultMessage : result.getResults()) {
final Message msg = resultMessage.getMessage();
summaries.add(new MessageSummary(resultMessage.getIndex(), msg));
}
} else {
summaries = Collections.emptyList();
}
final long count = result.getTotalResults();
final String resultDescription = "Stream received messages matching <" + query + "> "
+ "(Current grace time: " + grace + " minutes)";
if (count > 0) {
LOG.debug("Alert check <{}> found [{}] messages.", id, count);
return new CheckResult(true, this, resultDescription, Tools.nowUTC(), summaries);
} else {
LOG.debug("Alert check <{}> returned no results.", id);
return new NegativeCheckResult();
}
} catch (InvalidRangeParametersException e) {
// cannot happen lol
LOG.error("Invalid timerange.", e);
return null;
} catch (InvalidRangeFormatException e) {
// lol same here
LOG.error("Invalid timerange format.", e);
return null;
}
}
@Override
public String getDescription() {
return "field: " + field + ", value: " + value;
}
}
