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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.rest.resources.streams.alerts;
import com.codahale.metrics.annotation.Timed;
import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import io.swagger.annotations.ApiParam;
import io.swagger.annotations.ApiResponse;
import io.swagger.annotations.ApiResponses;
import org.apache.shiro.authz.annotation.RequiresAuthentication;
import org.graylog2.alerts.Alert;
import org.graylog2.alerts.AlertImpl;
import org.graylog2.alerts.AlertService;
import org.graylog2.database.NotFoundException;
import org.graylog2.plugin.Tools;
import org.graylog2.plugin.alarms.AlertCondition;
import org.graylog2.plugin.streams.Stream;
import org.graylog2.rest.models.streams.alerts.AlertListSummary;
import org.graylog2.rest.models.streams.alerts.AlertSummary;
import org.graylog2.shared.rest.resources.RestResource;
import org.graylog2.shared.security.RestPermissions;
import org.graylog2.streams.StreamService;
import org.joda.time.DateTime;
import org.joda.time.DateTimeZone;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.inject.Inject;
import javax.ws.rs.DefaultValue;
import javax.ws.rs.GET;
import javax.ws.rs.InternalServerErrorException;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.QueryParam;
import javax.ws.rs.core.MediaType;
import java.util.List;
import java.util.Map;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
@RequiresAuthentication
@Api(value = "Stream/Alerts", description = "Manage stream alerts for a given stream")
@Path("/streams/{streamId}/alerts")
public class StreamAlertResource extends RestResource {
private static final Logger LOG = LoggerFactory.getLogger(StreamAlertResource.class);
private static final String CACHE_KEY_BASE = "alerts";
private static final Cache> CACHE = CacheBuilder.newBuilder()
.expireAfterWrite(AlertImpl.REST_CHECK_CACHE_SECONDS, TimeUnit.SECONDS)
.build();
private final StreamService streamService;
private final AlertService alertService;
@Inject
public StreamAlertResource(StreamService streamService,
AlertService alertService) {
this.streamService = streamService;
this.alertService = alertService;
}
@GET
@Timed
@ApiOperation(value = "Get the " + AlertImpl.MAX_LIST_COUNT + " most recent alarms of this stream.")
@Produces(MediaType.APPLICATION_JSON)
@ApiResponses(value = {
@ApiResponse(code = 404, message = "Stream not found."),
@ApiResponse(code = 400, message = "Invalid ObjectId.")
})
public AlertListSummary list(@ApiParam(name = "streamId", value = "The stream id this new alert condition belongs to.", required = true)
@PathParam("streamId") String streamid,
@ApiParam(name = "since", value = "Optional parameter to define a lower date boundary. (UNIX timestamp)", required = false)
@QueryParam("since") int sinceTs) throws NotFoundException {
checkPermission(RestPermissions.STREAMS_READ, streamid);
final DateTime since;
if (sinceTs > 0) {
since = new DateTime(sinceTs * 1000L, DateTimeZone.UTC);
} else {
since = null;
}
final Stream stream = streamService.load(streamid);
final List conditions = toSummaryList(alertService.loadRecentOfStream(stream.getId(), since));
return AlertListSummary.create(alertService.totalCountForStream(streamid), conditions);
}
@GET
@Timed
@Path("paginated")
@ApiOperation(value = "Get the alarms of this stream, filtered by specifying limit and offset parameters.")
@Produces(MediaType.APPLICATION_JSON)
@ApiResponses(value = {
@ApiResponse(code = 404, message = "Stream not found."),
@ApiResponse(code = 400, message = "Invalid ObjectId.")
})
public AlertListSummary listPaginated(@ApiParam(name = "streamId", value = "The stream id this new alert condition belongs to.", required = true)
@PathParam("streamId") String streamid,
@ApiParam(name = "skip", value = "The number of elements to skip (offset).", required = true)
@QueryParam("skip") @DefaultValue("0") int skip,
@ApiParam(name = "limit", value = "The maximum number of elements to return.", required = true)
@QueryParam("limit") @DefaultValue("0") int limit) throws NotFoundException {
checkPermission(RestPermissions.STREAMS_READ, streamid);
if (limit == 0) { limit = AlertImpl.MAX_LIST_COUNT; }
final Stream stream = streamService.load(streamid);
final List conditions = toSummaryList(alertService.listForStreamId(stream.getId(), skip, limit));
return AlertListSummary.create(alertService.totalCountForStream(streamid), conditions);
}
@GET
@Timed
@Path("check")
@ApiOperation(value = "Check for triggered alert conditions of this streams. Results cached for " + AlertImpl.REST_CHECK_CACHE_SECONDS + " seconds.")
@Produces(MediaType.APPLICATION_JSON)
@ApiResponses(value = {
@ApiResponse(code = 404, message = "Stream not found."),
@ApiResponse(code = 400, message = "Invalid ObjectId.")
})
public Map checkConditions(@ApiParam(name = "streamId", value = "The ID of the stream to check.", required = true)
@PathParam("streamId") String streamid) throws NotFoundException {
checkPermission(RestPermissions.STREAMS_READ, streamid);
final Stream stream = streamService.load(streamid);
final Map result;
try {
result = CACHE.get(CACHE_KEY_BASE + stream.getId(), new Callable>() {
@Override
public Map call() throws Exception {
final List> results = Lists.newArrayList();
int triggered = 0;
for (AlertCondition alertCondition : streamService.getAlertConditions(stream)) {
final Map conditionResult = Maps.newHashMap();
conditionResult.put("condition", alertService.asMap(alertCondition));
final AlertCondition.CheckResult checkResult = alertService.triggeredNoGrace(alertCondition);
conditionResult.put("triggered", checkResult.isTriggered());
if (checkResult.isTriggered()) {
triggered++;
conditionResult.put("alert_description", checkResult.getResultDescription());
}
results.add(conditionResult);
}
return ImmutableMap.of(
"results", results,
"calculated_at", Tools.getISO8601String(Tools.nowUTC()),
"total_triggered", triggered);
}
});
} catch (ExecutionException e) {
LOG.error("Could not check for alerts.", e);
throw new InternalServerErrorException(e);
}
return result;
}
private List toSummaryList(List alertList) {
final List result = Lists.newArrayListWithCapacity(alertList.size());
for (Alert alert : alertList) {
result.add(AlertSummary.create(alert.getId(), alert.getConditionId(), alert.getStreamId(), alert.getDescription(), alert.getConditionParameters(), alert.getTriggeredAt()));
}
return result;
}
}
