/*
* 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.jdbctrace;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.StringReader;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.rhq.core.domain.configuration.Configuration;
import org.rhq.core.domain.configuration.PropertySimple;
import org.rhq.core.pluginapi.inventory.DiscoveredResourceDetails;
import org.rhq.core.pluginapi.inventory.InvalidPluginConfigurationException;
import org.rhq.core.pluginapi.inventory.ManualAddFacet;
import org.rhq.core.pluginapi.inventory.ResourceDiscoveryComponent;
import org.rhq.core.pluginapi.inventory.ResourceDiscoveryContext;
import org.rhq.core.util.stream.StreamUtil;
import org.rhq.plugins.byteman.BytemanAgentComponent;
/**
* Discovers a JDBC tracer. Usually, this just performs "manual add" discovery, but can auto-detect one if
* a VM has the JDBC tracer rules already installed.
*
* The JDBC Trace component is designed to be a singleton - there really should never be more than one
* of them under a single byteman agent parent resource.
*
* @author John Mazzitelli
*/
public class JdbcTracerDiscoveryComponent implements ResourceDiscoveryComponent<BytemanAgentComponent>,
ManualAddFacet<BytemanAgentComponent> {
private final Log log = LogFactory.getLog(JdbcTracerDiscoveryComponent.class);
private static final String RESOURCE_KEY_PREFIX = "jdbctrace";
private static final String RESOURCE_NAME = "JDBC Tracer";
private static final String RESOURCE_DESC = "Byte-injection rules that trace JDBC invocations";
public Set<DiscoveredResourceDetails> discoverResources(ResourceDiscoveryContext<BytemanAgentComponent> context) {
log.info("Discovering JDBC tracer");
HashSet<DiscoveredResourceDetails> set = new HashSet<DiscoveredResourceDetails>();
Map<String, String> allKnownScripts = context.getParentResourceComponent().getAllKnownScripts();
String discoveredJdbcTraceScriptName = null;
String discoveredJdbcTraceScriptContent = null;
if (allKnownScripts != null) {
for (Map.Entry<String, String> entry : allKnownScripts.entrySet()) {
String scriptName = entry.getKey();
File file = new File(scriptName);
if (JdbcTracerUtil.DEFAULT_JDBC_TRACER_SCRIPT_NAME.equals(file.getName())) {
// it looks like the Byteman agent already has the JDBC tracer script installed! Let's use it
discoveredJdbcTraceScriptName = scriptName;
discoveredJdbcTraceScriptContent = entry.getValue();
log.info("Auto-discovered an existing JDBC Tracer resource. script="
+ discoveredJdbcTraceScriptName);
break;
}
}
}
if (discoveredJdbcTraceScriptName != null) {
String key = RESOURCE_KEY_PREFIX + '-' + JdbcTracerUtil.DEFAULT_JDBC_TRACER_SCRIPT_NAME;
String name = RESOURCE_NAME;
String description = RESOURCE_DESC;
String version = determineJdbcScriptVersion(discoveredJdbcTraceScriptContent);
Configuration pc = context.getDefaultPluginConfiguration();
pc.put(new PropertySimple(JdbcTracerUtil.PLUGINCONFIG_ENABLED, "true"));
pc.put(new PropertySimple(JdbcTracerUtil.PLUGINCONFIG_SCRIPTNAME,
JdbcTracerUtil.DEFAULT_JDBC_TRACER_SCRIPT_NAME));
DiscoveredResourceDetails resource = new DiscoveredResourceDetails(context.getResourceType(), key, name,
version, description, pc, null);
set.add(resource);
}
return set;
}
public DiscoveredResourceDetails discoverResource(Configuration pluginConfiguration,
ResourceDiscoveryContext<BytemanAgentComponent> context) throws InvalidPluginConfigurationException {
String scriptName;
String scriptContent;
try {
scriptName = pluginConfiguration.getSimpleValue(JdbcTracerUtil.PLUGINCONFIG_SCRIPTNAME,
JdbcTracerUtil.DEFAULT_JDBC_TRACER_SCRIPT_NAME);
BytemanAgentComponent bytemanAgentResource = context.getParentResourceComponent();
File scriptFile = new JdbcTracerUtil().extractJdbcTraceRulesScriptFile(bytemanAgentResource, scriptName);
scriptContent = new String(StreamUtil.slurp(new FileInputStream(scriptFile)));
} catch (Exception e) {
throw new RuntimeException("Failed to extract jdbc trace script file", e);
}
String key = RESOURCE_KEY_PREFIX + '-' + scriptName;
String name = RESOURCE_NAME;
String description = RESOURCE_DESC;
String version = determineJdbcScriptVersion(scriptContent);
DiscoveredResourceDetails resource = new DiscoveredResourceDetails(context.getResourceType(), key, name,
version, description, pluginConfiguration, null);
return resource;
}
/**
* Will examine the script content and determine the version of the script.
* In order for this to determine a version, there must be a variable binding in
* the script that defines a String variable named "_version". This _version
* binding must be the first binding defined in the BIND statement.
*
* @param scriptContent
* @return the script version if it could be determined - if not, a constant string will be returned
* to indicate an indeterminate version.
*/
private String determineJdbcScriptVersion(String scriptContent) {
try {
Pattern ruleNamePattern = Pattern.compile("\\s*BIND\\s+_version:String\\s*=\\s*\"(.+)\"\\s*,?\\s*");
Matcher matcher;
String version = null;
BufferedReader reader = new BufferedReader(new StringReader(scriptContent));
String line = reader.readLine();
while (line != null && version == null) {
matcher = ruleNamePattern.matcher(line);
if (matcher.matches()) {
version = matcher.group(1);
}
line = reader.readLine();
}
return (version != null) ? version : "unversioned";
} catch (Exception e) {
// should never really happen, just ignore it
return "unknown";
}
}
}