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a plugin for monitoring RHQ agents
/*
* RHQ Management Platform
* Copyright (C) 2005-2008 Red Hat, Inc.
* All rights reserved.
*
* This program 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 version 2 of the License.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
package org.rhq.plugins.agent;
import java.io.BufferedInputStream;
import java.io.CharArrayWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
import java.util.concurrent.ExecutionException;
import javax.management.MBeanException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.mc4j.ems.connection.EmsInvocationException;
import org.mc4j.ems.connection.bean.EmsBean;
import org.rhq.core.domain.configuration.Configuration;
import org.rhq.core.domain.configuration.ConfigurationUpdateStatus;
import org.rhq.core.domain.configuration.PropertySimple;
import org.rhq.core.domain.measurement.AvailabilityType;
import org.rhq.core.domain.measurement.MeasurementDataNumeric;
import org.rhq.core.domain.measurement.MeasurementDataTrait;
import org.rhq.core.domain.measurement.MeasurementReport;
import org.rhq.core.domain.measurement.MeasurementScheduleRequest;
import org.rhq.core.pluginapi.configuration.ConfigurationFacet;
import org.rhq.core.pluginapi.configuration.ConfigurationUpdateReport;
import org.rhq.core.pluginapi.event.log.LogFileEventResourceComponentHelper;
import org.rhq.core.pluginapi.inventory.ResourceComponent;
import org.rhq.core.pluginapi.inventory.ResourceContext;
import org.rhq.core.pluginapi.measurement.MeasurementFacet;
import org.rhq.core.pluginapi.operation.OperationFacet;
import org.rhq.core.pluginapi.operation.OperationResult;
import org.rhq.core.pluginapi.support.SnapshotReportRequest;
import org.rhq.core.pluginapi.support.SnapshotReportResults;
import org.rhq.core.pluginapi.support.SupportFacet;
import org.rhq.core.system.SystemInfoFactory;
import org.rhq.core.util.exception.ExceptionPackage;
import org.rhq.core.util.exception.Severity;
import org.rhq.enterprise.agent.AgentManagement;
import org.rhq.enterprise.agent.AgentManagementMBean;
import org.rhq.plugins.jmx.JMXComponent;
import org.rhq.plugins.jmx.JMXServerComponent;
/**
* The component that represents the Agent itself.
*
* @author John Mazzitelli
*/
public class AgentServerComponent> extends JMXServerComponent implements
JMXComponent, MeasurementFacet, OperationFacet, ConfigurationFacet, SupportFacet {
private static Log log = LogFactory.getLog(AgentServerComponent.class);
/**
* This is a substring that starts all trait measurement property names.
*/
private static final String TRAIT_INDICATOR = "Trait.";
private static final String SIGAR_VERSION_METRIC_SUFFIX = "SigarVersion";
private static final String REASON_FOR_LAST_RESTART_METRIC_SUFFIX = "ReasonForLastRestart";
private static final String AGENT_HOME_DIRECTORY_METRIC_SUFFIX = "AgentHomeDirectory";
private String sigarVersion;
// needed for log tracking
private LogFileEventResourceComponentHelper logFileEventDelegate;
@Override
public void start(ResourceContext resourceContext) throws Exception {
super.start(resourceContext);
this.sigarVersion = SystemInfoFactory.getNativeSystemInfoVersion();
this.logFileEventDelegate = new LogFileEventResourceComponentHelper(resourceContext);
this.logFileEventDelegate.startLogFileEventPollers();
}
@Override
public void stop() {
this.logFileEventDelegate.stopLogFileEventPollers();
super.stop();
}
@Override
public AvailabilityType getAvailability() {
// this one is simple - if this plugin is running, then we automatically know the agent is up!
return AvailabilityType.UP;
}
protected EmsBean getAgentBean() {
return getEmsConnection().getBean(AgentManagement.singletonObjectName.getCanonicalName());
}
public void getValues(MeasurementReport report, Set metrics) {
for (MeasurementScheduleRequest metric_request : metrics) {
String metric_name = metric_request.getName();
if (metric_name.startsWith(TRAIT_INDICATOR)) {
try {
if (metric_name.endsWith(SIGAR_VERSION_METRIC_SUFFIX)) {
report.addData(new MeasurementDataTrait(metric_request, this.sigarVersion));
} else if (metric_name.endsWith(REASON_FOR_LAST_RESTART_METRIC_SUFFIX)) {
Object reason = getAgentBean().getAttribute(REASON_FOR_LAST_RESTART_METRIC_SUFFIX).refresh();
report.addData(new MeasurementDataTrait(metric_request, reason.toString()));
} else if (metric_name.endsWith(AGENT_HOME_DIRECTORY_METRIC_SUFFIX)) {
Object reason = getAgentBean().getAttribute(AGENT_HOME_DIRECTORY_METRIC_SUFFIX).refresh();
report.addData(new MeasurementDataTrait(metric_request, reason.toString()));
} else {
log.error("Being asked to collect an unknown trait measurement: " + metric_name);
}
} catch (Exception skip) {
log.debug(skip);
}
} else {
// I know that all current metrics are either long or int - so they can be cast to Number
Number metric_value;
try {
metric_value = (Number) getAgentBean().getAttribute(metric_name).refresh(); // This is always local, just update individual metrics
report.addData(new MeasurementDataNumeric(metric_request, metric_value.doubleValue()));
} catch (Exception e) {
log.error("Failed to obtain metric [" + metric_name + "]. Cause: " + e);
}
}
}
return;
}
public OperationResult invokeOperation(String name, Configuration params) {
OperationResult result = null;
// I know all operation names have identical MBean operations on the agent management MBean
// I also know about all operations that have void and non-void parameters
try {
if ((params == null) || (params.getProperties().size() == 0)) {
result = (OperationResult) getAgentBean().getOperation(name).invoke();
} else {
if (name.equals("retrievePluginInfo")) {
String pluginToUpdate = params.getSimple("pluginName").getStringValue();
result = (OperationResult) getAgentBean().getOperation(name).invoke(pluginToUpdate);
} else if (name.equals("executeAvailabilityScan")) {
Boolean changesOnly = params.getSimple("changesOnly").getBooleanValue();
result = (OperationResult) getAgentBean().getOperation(name).invoke(changesOnly);
} else if (name.equals("retrieveCurrentDateTime")) {
String timeZone = params.getSimple("timeZone").getStringValue();
result = new OperationResult();
result.getComplexResults().put(
new PropertySimple("dateTime", getAgentBean().getOperation(name).invoke(timeZone)));
} else if (name.equals("setDebugMode")) {
Boolean enabled = params.getSimple("enabled").getBooleanValue();
Boolean traceMessaging = params.getSimple("traceMessaging").getBooleanValue();
result = new OperationResult();
getAgentBean().getOperation(name).invoke(enabled, traceMessaging);
} else if (name.equals("executePromptCommand")) {
String command = params.getSimple("command").getStringValue();
result = new OperationResult();
try {
Object output = getAgentBean().getOperation(name).invoke(command);
result.getComplexResults().put(new PropertySimple("output", output));
} catch (EmsInvocationException eie) {
if (eie.getCause() instanceof MBeanException
&& eie.getCause().getCause() instanceof ExecutionException) {
// the prompt command threw the exception - in this case:
// the message is the prompt output and the cause is the actual prompt exception
ExecutionException ee = (ExecutionException) eie.getCause().getCause();
String output = ee.getMessage();
CharArrayWriter caw = new CharArrayWriter();
ee.getCause().printStackTrace(new PrintWriter(caw));
String error = caw.toString();
result.getComplexResults().put(new PropertySimple("output", output));
result.getComplexResults().put(new PropertySimple("error", error));
} else {
throw eie;
}
}
} else if (name.equals("switchToServer")) {
String server = params.getSimpleValue("server", null);
getAgentBean().getOperation(name).invoke(server);
} else {
// this should really never happen
throw new IllegalArgumentException("Operation [" + name + "] does not support params");
}
}
} catch (Exception e) {
throw new RuntimeException("Failed to invoke operation [" + name + "]", e);
}
return result;
}
public Configuration loadResourceConfiguration() {
// the agent preferences are simple name/value pairs; just create a Configuration
// with a bunch of simple properties, one simple property for each agent preference
AgentManagementMBean mbean = AgentDiscoveryComponent.getAgentManagementMBean();
Properties agent_prefs = mbean.getAgentConfiguration();
Configuration config = new Configuration();
for (Map.Entry pref : agent_prefs.entrySet()) {
config.put(new PropertySimple(pref.getKey().toString(), pref.getValue()));
}
return config;
}
public void updateResourceConfiguration(ConfigurationUpdateReport request) {
Configuration configuration = request.getConfiguration();
Collection config_names = configuration.getNames();
Properties prefsToMerge = new Properties();
List prefsToRemove = new ArrayList();
for (String config_name : config_names) {
String config_value = configuration.getSimple(config_name).getStringValue();
// skip props w/ null values, since java.util.Properties does not allow null values.
if (config_value != null) {
prefsToMerge.setProperty(config_name, config_value);
} else {
prefsToRemove.add(config_name);
}
}
try {
AgentManagementMBean mbean = AgentDiscoveryComponent.getAgentManagementMBean();
mbean.mergeIntoAgentConfiguration(prefsToMerge);
mbean.removeFromAgentConfiguration(prefsToRemove);
request.setStatus(ConfigurationUpdateStatus.SUCCESS);
} catch (Exception e) {
request.setErrorMessage(new ExceptionPackage(Severity.Severe, e).toString());
}
return;
}
public SnapshotReportResults getSnapshotReport(SnapshotReportRequest request) throws Exception {
AgentManagementMBean mbean = AgentDiscoveryComponent.getAgentManagementMBean();
ResourceContext resourceContext = getResourceContext();
Configuration pluginConfig = resourceContext.getPluginConfiguration();
String installDir = mbean.getAgentHomeDirectory();
Properties config = mbean.getAgentConfiguration();
String tmpDir = resourceContext.getTemporaryDirectory().getAbsolutePath();
String name = request.getName();
String description = request.getDescription();
AgentSnapshotReport report = new AgentSnapshotReport(name, description, pluginConfig, installDir, config,
tmpDir);
File reportFile = report.generate();
InputStream inputStream = new BufferedInputStream(new FileInputStream(reportFile));
SnapshotReportResults results = new SnapshotReportResults(inputStream);
return results;
}
}