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a plugin for managing Apache web servers (1.3 and later)
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/*
* 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.apache;
import java.io.File;
import java.util.List;
import org.rhq.core.domain.configuration.Configuration;
import org.rhq.core.domain.configuration.PropertySimple;
import org.rhq.core.pluginapi.operation.OperationContext;
import org.rhq.core.pluginapi.operation.OperationFacet;
import org.rhq.core.pluginapi.operation.OperationResult;
import org.rhq.core.pluginapi.util.ProcessExecutionUtility;
import org.rhq.core.system.OperatingSystemType;
import org.rhq.core.system.ProcessExecution;
import org.rhq.core.system.ProcessExecutionResults;
import org.rhq.core.system.SystemInfo;
/**
* Executes operations on an Apache server ({@link ApacheServerComponent} delegates to this class).
*
* @author Ian Springer
*/
public class ApacheServerOperationsDelegate implements OperationFacet {
private static final String EXIT_CODE_RESULT_PROP = "exitCode";
private static final String OUTPUT_RESULT_PROP = "output";
/**
* Server component against which the operations are being performed.
*/
private ApacheServerComponent serverComponent;
/**
* Passed in from the resource context for making process calls.
*/
private SystemInfo systemInfo;
/**
* The plugin configuration of the server component.
*/
private Configuration serverPluginConfiguration;
// Constructors --------------------------------------------
public ApacheServerOperationsDelegate(ApacheServerComponent serverComponent,
Configuration serverPluginConfiguration, SystemInfo systemInfo) {
this.serverComponent = serverComponent;
this.systemInfo = systemInfo;
this.serverPluginConfiguration = serverPluginConfiguration;
}
public void startOperationFacet(OperationContext context) {
}
public OperationResult invokeOperation(String name, Configuration params) throws Exception {
if ("install_mod_jk".equals(name)) {
return ModJKComponent.installModJk(serverComponent, params);
}
// Continue with generic operations
Operation operation = getOperation(name);
File controlScriptPath = this.serverComponent.getControlScriptPath();
validateScriptFile(controlScriptPath);
ProcessExecution processExecution = ProcessExecutionUtility.createProcessExecution(controlScriptPath);
processExecution.setWaitForCompletion(1000 * 30); // 30 seconds - should be plenty
processExecution.setCaptureOutput(true); // essential, since we want to include the output in the result
addDefaultArguments(processExecution);
//we always add some arguments to the control script thus forcing the passthrough mode.
//therefore no matter if we use httpd, Apache.exe or apachectl, the -k argument will always
//be used to specify the operation to invoke.
if (operation != Operation.CONFIG_TEST) {
processExecution.getArguments().add("-k");
}
// request an avail check after a lifecycle operation
boolean availCheck = true;
switch (operation) {
case START: {
processExecution.getArguments().add("start");
break;
}
case STOP: {
processExecution.getArguments().add("stop");
break;
}
case RESTART: {
abortIfOsIsWindows(name);
processExecution.getArguments().add("restart");
break;
}
case START_SSL: {
abortIfOsIsWindows(name);
processExecution.getArguments().add("startssl");
break;
}
case GRACEFUL_RESTART: {
processExecution.getArguments().add((osIsWindows()) ? "restart" : "graceful");
break;
}
case CONFIG_TEST: {
// abortIfOsIsWindows(name);
processExecution.getArguments().add("-t");
availCheck = false;
break;
}
default:
availCheck = false;
}
ProcessExecutionResults processExecutionResults = this.systemInfo.executeProcess(processExecution);
Integer exitCode = processExecutionResults.getExitCode();
// If this operation could have affected availability, ask for a check
if (availCheck) {
this.serverComponent.getResourceContext().getAvailabilityContext().requestAvailabilityCheck();
}
// Do some more aggressive result code checking, as otherwise errors are not reported as such
// in the GUI -- see RHQ-627
// We might want to investigate this again later.
if (processExecutionResults.getError() != null || (exitCode != null && exitCode != 0)) {
String msg =
"Operation " + operation + " failed. Exit code: [" + exitCode + "]\n, Output : ["
+ processExecutionResults.getCapturedOutput() + "]\n" + "Error: ["
+ processExecutionResults.getError() + "]";
throw new Exception(msg);
}
return createOperationResult(processExecutionResults);
}
private void addDefaultArguments(ProcessExecution processExecution) throws Exception {
List args = processExecution.getArguments();
//these plugin config properties are required and readonly, so they should never be null
args.add("-d");
args.add(serverPluginConfiguration.getSimpleValue(ApacheServerComponent.PLUGIN_CONFIG_PROP_SERVER_ROOT, null));
args.add("-f");
args.add(serverPluginConfiguration.getSimpleValue(ApacheServerComponent.PLUGIN_CONFIG_PROP_HTTPD_CONF, null));
}
private OperationResult createOperationResult(ProcessExecutionResults processExecutionResults) {
OperationResult operationResult = new OperationResult();
Integer exitCode = processExecutionResults.getExitCode();
String output = processExecutionResults.getCapturedOutput(); // NOTE: this is stdout + stderr
Configuration complexResults = operationResult.getComplexResults();
complexResults.put(new PropertySimple(EXIT_CODE_RESULT_PROP, exitCode));
complexResults.put(new PropertySimple(OUTPUT_RESULT_PROP, output));
return operationResult;
}
private boolean osIsWindows() {
return this.systemInfo.getOperatingSystemType() == OperatingSystemType.WINDOWS;
}
private static void validateScriptFile(File scriptFile) {
if (!scriptFile.exists()) {
throw new IllegalStateException("Script (" + scriptFile + ") specified via '"
+ ApacheServerComponent.PLUGIN_CONFIG_PROP_CONTROL_SCRIPT_PATH
+ "' connection property does not exist.");
}
if (scriptFile.isDirectory()) {
throw new IllegalStateException("Script (" + scriptFile + ") specified via '"
+ ApacheServerComponent.PLUGIN_CONFIG_PROP_CONTROL_SCRIPT_PATH
+ "' connection property is a directory, not a file.");
}
}
private static Operation getOperation(String name) {
Operation operation;
try {
operation = Operation.valueOf(name.toUpperCase());
} catch (IllegalArgumentException e) {
throw new IllegalArgumentException("Invalid operation name: " + name);
}
return operation;
}
private void abortIfOsIsWindows(String name) {
if (osIsWindows()) {
throw new IllegalArgumentException("The " + name + " operation is not supported on Windows.");
}
}
/**
* Enumeration of supported operations for an Apache server.
*/
private enum Operation {
START,
STOP,
RESTART,
START_SSL,
GRACEFUL_RESTART,
CONFIG_TEST
}
}