/*
* 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 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;
import azkaban.executor.ConnectorParams;
import azkaban.executor.ExecutorManagerAdapter;
import azkaban.server.session.Session;
import azkaban.trigger.TriggerManager;
import azkaban.user.Permission;
import azkaban.user.Role;
import azkaban.user.User;
import azkaban.user.UserManager;
import azkaban.webapp.AzkabanWebServer;
/**
* 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(ServletConfig config) throws ServletException {
super.init(config);
server = (AzkabanWebServer) getApplication();
userManager = server.getUserManager();
executorManager = server.getExecutorManager();
triggerManager = server.getTriggerManager();
}
@Override
protected void handleGet(HttpServletRequest req, HttpServletResponse resp,
Session session) throws ServletException, IOException {
if (hasParam(req, "ajax")) {
Map<String, Object> ret = new HashMap<String, Object>();
if (!hasPermission(session.getUser(), Permission.Type.METRICS)) {
ret.put("error", "User " + session.getUser().getUserId()
+ " has no permission.");
this.writeJSON(resp, ret, true);
return;
}
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;
}
String hostPort = getParam(req, JMX_HOSTPORT);
String mbean = getParam(req, JMX_MBEAN);
Map<String, Object> result =
executorManager.callExecutorJMX(hostPort,
JMX_GET_ALL_MBEAN_ATTRIBUTES, mbean);
// order the attribute by name
for (Map.Entry<String, Object> entry : result.entrySet()) {
if (entry.getValue() instanceof Map) {
@SuppressWarnings("unchecked")
Map<String, Object> entryValue = (Map<String, Object>) entry.getValue();
result.put(entry.getKey(), new TreeMap<String,Object>(entryValue));
}
}
ret = result;
} else if (JMX_GET_MBEANS.equals(ajax)) {
ret.put("mbeans", server.getMbeanNames());
} else if (JMX_GET_MBEAN_INFO.equals(ajax)) {
if (hasParam(req, JMX_MBEAN)) {
String mbeanName = getParam(req, JMX_MBEAN);
try {
ObjectName name = new ObjectName(mbeanName);
MBeanInfo info = server.getMBeanInfo(name);
ret.put("attributes", info.getAttributes());
ret.put("description", info.getDescription());
} catch (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 {
String mbeanName = getParam(req, JMX_MBEAN);
String attribute = getParam(req, JMX_ATTRIBUTE);
try {
ObjectName name = new ObjectName(mbeanName);
Object obj = server.getMBeanAttribute(name, attribute);
ret.put("value", obj);
} catch (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 {
String mbeanName = getParam(req, JMX_MBEAN);
try {
ObjectName name = new ObjectName(mbeanName);
MBeanInfo info = server.getMBeanInfo(name);
MBeanAttributeInfo[] mbeanAttrs = info.getAttributes();
Map<String, Object> attributes = new TreeMap<String, Object>();
for (MBeanAttributeInfo attrInfo : mbeanAttrs) {
Object obj = server.getMBeanAttribute(name, attrInfo.getName());
attributes.put(attrInfo.getName(), obj);
}
ret.put("attributes", attributes);
} catch (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(HttpServletRequest req, HttpServletResponse resp,
Session session) throws IOException {
Page page =
newPage(req, resp, session,
"azkaban/webapp/servlet/velocity/jmxpage.vm");
if (!hasPermission(session.getUser(), Permission.Type.METRICS)) {
page.add("errorMsg", "User " + session.getUser().getUserId()
+ " has no permission.");
page.render();
return;
}
page.add("mbeans", server.getMbeanNames());
Map<String, Object> executorMBeans = new HashMap<String, Object>();
for (String hostPort : executorManager.getAllActiveExecutorServerHosts()) {
try {
Map<String, Object> mbeans =
executorManager.callExecutorJMX(hostPort, JMX_GET_MBEANS, null);
executorMBeans.put(hostPort, mbeans.get("mbeans"));
} catch (IOException e) {
logger.error("Cannot contact executor " + hostPort, e);
}
}
page.add("executorRemoteMBeans", executorMBeans);
Map<String, Object> triggerserverMBeans = new HashMap<String, Object>();
triggerserverMBeans.put(triggerManager.getJMX().getPrimaryServerHost(),
triggerManager.getJMX().getAllJMXMbeans());
page.add("triggerserverRemoteMBeans", triggerserverMBeans);
page.render();
}
@Override
protected void handlePost(HttpServletRequest req, HttpServletResponse resp,
Session session) throws ServletException, IOException {
}
protected boolean hasPermission(User user, Permission.Type type) {
for (String roleName : user.getRoles()) {
Role role = userManager.getRole(roleName);
if (role.getPermission().isPermissionSet(type)
|| role.getPermission().isPermissionSet(Permission.Type.ADMIN)) {
return true;
}
}
return false;
}
}