/**
* 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.periodical;
import com.google.inject.Inject;
import org.graylog2.Configuration;
import org.graylog2.cluster.Node;
import org.graylog2.cluster.NodeNotFoundException;
import org.graylog2.cluster.NodeService;
import org.graylog2.notifications.Notification;
import org.graylog2.notifications.NotificationImpl;
import org.graylog2.notifications.NotificationService;
import org.graylog2.plugin.periodical.Periodical;
import org.graylog2.plugin.ServerStatus;
import org.graylog2.system.activities.Activity;
import org.graylog2.system.activities.ActivityWriter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* @author Lennart Koopmann <lennart@torch.sh>
*/
public class NodePingThread extends Periodical {
private static final Logger LOG = LoggerFactory.getLogger(NodePingThread.class);
private final NodeService nodeService;
private final NotificationService notificationService;
private final ActivityWriter activityWriter;
private final Configuration configuration;
private final ServerStatus serverStatus;
@Inject
public NodePingThread(NodeService nodeService,
NotificationService notificationService,
ActivityWriter activityWriter,
Configuration configuration,
ServerStatus serverStatus) {
this.nodeService = nodeService;
this.notificationService = notificationService;
this.activityWriter = activityWriter;
this.configuration = configuration;
this.serverStatus = serverStatus;
}
@Override
public void doRun() {
final boolean isMaster = serverStatus.hasCapability(ServerStatus.Capability.MASTER);
try {
Node node = nodeService.byNodeId(serverStatus.getNodeId());
nodeService.markAsAlive(node, isMaster, configuration.getRestTransportUri());
} catch (NodeNotFoundException e) {
LOG.warn("Did not find meta info of this node. Re-registering.");
nodeService.registerServer(serverStatus.getNodeId().toString(), isMaster, configuration.getRestTransportUri());
}
try {
// Remove old nodes that are no longer running. (Just some housekeeping)
nodeService.dropOutdated();
// Check that we still have a master node in the cluster, if not, warn the user.
if (nodeService.isAnyMasterPresent()) {
Notification notification = notificationService.build()
.addType(Notification.Type.NO_MASTER);
boolean removedNotification = notificationService.fixed(notification);
if (removedNotification) {
activityWriter.write(
new Activity("Notification condition [" + NotificationImpl.Type.NO_MASTER + "] " +
"has been fixed.", NodePingThread.class));
}
} else {
Notification notification = notificationService.buildNow()
.addNode(serverStatus.getNodeId().toString())
.addType(Notification.Type.NO_MASTER)
.addSeverity(Notification.Severity.URGENT);
notificationService.publishIfFirst(notification);
}
} catch (Exception e) {
LOG.warn("Caught exception during node ping.", e);
}
}
@Override
protected Logger getLogger() {
return LOG;
}
@Override
public boolean runsForever() {
return false;
}
@Override
public boolean stopOnGracefulShutdown() {
return false;
}
@Override
public boolean masterOnly() {
return false;
}
@Override
public boolean startOnThisNode() {
return true;
}
@Override
public boolean isDaemon() {
return true;
}
@Override
public int getInitialDelaySeconds() {
return 0;
}
@Override
public int getPeriodSeconds() {
return 1;
}
}