/*
* Copyright 2012 LinkedIn Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package azkaban.webapp.servlet;
import azkaban.executor.ConnectorParams;
import azkaban.executor.ExecutorManagerAdapter;
import azkaban.server.session.Session;
import azkaban.trigger.TriggerManager;
import azkaban.user.UserManager;
import azkaban.webapp.AzkabanWebServer;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.TreeMap;
import javax.management.MBeanAttributeInfo;
import javax.management.MBeanInfo;
import javax.management.ObjectName;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.log4j.Logger;
/**
* Limited set of jmx calls for when you cannot attach to the jvm
*/
public class JMXHttpServlet extends LoginAbstractAzkabanServlet implements
ConnectorParams {
/**
*
*/
private static final long serialVersionUID = 1L;
private static final Logger logger = Logger.getLogger(JMXHttpServlet.class
.getName());
private UserManager userManager;
private AzkabanWebServer server;
private ExecutorManagerAdapter executorManager;
private TriggerManager triggerManager;
@Override
public void init(final ServletConfig config) throws ServletException {
super.init(config);
this.server = (AzkabanWebServer) getApplication();
this.userManager = this.server.getUserManager();
this.executorManager = this.server.getExecutorManager();
this.triggerManager = this.server.getTriggerManager();
}
@Override
protected void handleGet(final HttpServletRequest req, final HttpServletResponse resp,
final Session session) throws ServletException, IOException {
if (hasParam(req, "ajax")) {
Map<String, Object> ret = new HashMap<>();
final String ajax = getParam(req, "ajax");
if (JMX_GET_ALL_EXECUTOR_ATTRIBUTES.equals(ajax)) {
if (!hasParam(req, JMX_MBEAN) || !hasParam(req, JMX_HOSTPORT)) {
ret.put("error", "Parameters '" + JMX_MBEAN + "' and '"
+ JMX_HOSTPORT + "' must be set");
this.writeJSON(resp, ret, true);
return;
}
final String hostPort = getParam(req, JMX_HOSTPORT);
final String mbean = getParam(req, JMX_MBEAN);
final Map<String, Object> result =
this.executorManager.callExecutorJMX(hostPort,
JMX_GET_ALL_MBEAN_ATTRIBUTES, mbean);
// order the attribute by name
for (final Map.Entry<String, Object> entry : result.entrySet()) {
if (entry.getValue() instanceof Map) {
final Map<String, Object> entryValue = (Map<String, Object>) entry.getValue();
result.put(entry.getKey(), new TreeMap<>(entryValue));
}
}
ret = result;
} else if (JMX_GET_MBEANS.equals(ajax)) {
ret.put("mbeans", this.server.getMbeanNames());
} else if (JMX_GET_MBEAN_INFO.equals(ajax)) {
if (hasParam(req, JMX_MBEAN)) {
final String mbeanName = getParam(req, JMX_MBEAN);
try {
final ObjectName name = new ObjectName(mbeanName);
final MBeanInfo info = this.server.getMBeanInfo(name);
ret.put("attributes", info.getAttributes());
ret.put("description", info.getDescription());
} catch (final Exception e) {
logger.error(e);
ret.put("error", "'" + mbeanName + "' is not a valid mBean name");
}
} else {
ret.put("error", "No 'mbean' name parameter specified");
}
} else if (JMX_GET_MBEAN_ATTRIBUTE.equals(ajax)) {
if (!hasParam(req, JMX_MBEAN) || !hasParam(req, JMX_ATTRIBUTE)) {
ret.put("error", "Parameters 'mbean' and 'attribute' must be set");
} else {
final String mbeanName = getParam(req, JMX_MBEAN);
final String attribute = getParam(req, JMX_ATTRIBUTE);
try {
final ObjectName name = new ObjectName(mbeanName);
final Object obj = this.server.getMBeanAttribute(name, attribute);
ret.put("value", obj);
} catch (final Exception e) {
logger.error(e);
ret.put("error", "'" + mbeanName + "' is not a valid mBean name");
}
}
} else if (JMX_GET_ALL_MBEAN_ATTRIBUTES.equals(ajax)) {
if (!hasParam(req, JMX_MBEAN)) {
ret.put("error", "Parameters 'mbean' must be set");
} else {
final String mbeanName = getParam(req, JMX_MBEAN);
try {
final ObjectName name = new ObjectName(mbeanName);
final MBeanInfo info = this.server.getMBeanInfo(name);
final MBeanAttributeInfo[] mbeanAttrs = info.getAttributes();
final Map<String, Object> attributes = new TreeMap<>();
for (final MBeanAttributeInfo attrInfo : mbeanAttrs) {
final Object obj = this.server.getMBeanAttribute(name, attrInfo.getName());
attributes.put(attrInfo.getName(), obj);
}
ret.put("attributes", attributes);
} catch (final Exception e) {
logger.error(e);
ret.put("error", "'" + mbeanName + "' is not a valid mBean name");
}
}
} else {
ret.put("commands", new String[]{
JMX_GET_MBEANS,
JMX_GET_MBEAN_INFO + "&" + JMX_MBEAN + "=<name>",
JMX_GET_MBEAN_ATTRIBUTE + "&" + JMX_MBEAN + "=<name>&"
+ JMX_ATTRIBUTE + "=<attributename>"});
}
this.writeJSON(resp, ret, true);
} else {
handleJMXPage(req, resp, session);
}
}
private void handleJMXPage(final HttpServletRequest req, final HttpServletResponse resp,
final Session session) throws IOException {
final Page page =
newPage(req, resp, session,
"azkaban/webapp/servlet/velocity/jmxpage.vm");
page.add("mbeans", this.server.getMbeanNames());
final Map<String, Object> executorMBeans = new HashMap<>();
for (final String hostPort : this.executorManager.getAllActiveExecutorServerHosts()) {
try {
final Map<String, Object> mbeans =
this.executorManager.callExecutorJMX(hostPort, JMX_GET_MBEANS, null);
executorMBeans.put(hostPort, mbeans.get("mbeans"));
} catch (final IOException e) {
logger.error("Cannot contact executor " + hostPort, e);
}
}
page.add("executorRemoteMBeans", executorMBeans);
final Map<String, Object> triggerserverMBeans = new HashMap<>();
triggerserverMBeans.put(this.triggerManager.getJMX().getPrimaryServerHost(),
this.triggerManager.getJMX().getAllJMXMbeans());
page.add("triggerserverRemoteMBeans", triggerserverMBeans);
page.render();
}
@Override
protected void handlePost(final HttpServletRequest req, final HttpServletResponse resp,
final Session session) throws ServletException, IOException {
}
}