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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.cassandra.tools.nodetool;
import java.io.IOException;
import java.io.PrintStream;
import java.lang.reflect.Field;
import java.net.URL;
import java.net.URLDecoder;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
import javax.management.MBeanServerConnection;
import com.beust.jcommander.JCommander;
import com.beust.jcommander.ParameterDescription;
import com.beust.jcommander.Parameterized;
import io.airlift.airline.Arguments;
import io.airlift.airline.Command;
import org.apache.cassandra.io.util.File;
import org.apache.cassandra.tools.Output;
import org.gridkit.jvmtool.JmxConnectionInfo;
import org.gridkit.jvmtool.cli.CommandLauncher;
import org.apache.cassandra.tools.NodeProbe;
import org.apache.cassandra.tools.NodeTool.NodeToolCmd;
@Command(name = "sjk", description = "Run commands of 'Swiss Java Knife'. Run 'nodetool sjk --help' for more information.")
public class Sjk extends NodeToolCmd
{
@Arguments(description = "Arguments passed as is to 'Swiss Java Knife'.")
private List args;
private final Wrapper wrapper = new Wrapper();
@Override
public void runInternal()
{
wrapper.prepare(args != null ? args.toArray(new String[0]) : new String[]{"help"}, output.out, output.err);
if (!wrapper.requiresMbeanServerConn())
{
// SJK command does not require an MBeanServerConnection, so just invoke it
wrapper.run(null, output);
}
else
{
// invoke common nodetool handling to establish MBeanServerConnection
super.runInternal();
}
}
public void sequenceRun(NodeProbe probe)
{
wrapper.prepare(args != null ? args.toArray(new String[0]) : new String[]{"help"}, probe.output().out, probe.output().err);
if (!wrapper.run(probe, probe.output()))
probe.failed();
}
protected void execute(NodeProbe probe)
{
if (!wrapper.run(probe, probe.output()))
probe.failed();
}
/**
* Adopted copy of {@link org.gridkit.jvmtool.SJK} from https://github.com/aragozin/jvm-tools.
*/
public static class Wrapper extends CommandLauncher
{
boolean suppressSystemExit;
private final Map commands = new HashMap<>();
private JCommander parser;
private Runnable cmd;
public void suppressSystemExit()
{
suppressSystemExit = true;
super.suppressSystemExit();
}
public boolean start(String[] args)
{
throw new UnsupportedOperationException();
}
public void prepare(String[] args, PrintStream out, PrintStream err)
{
try
{
parser = new JCommander(this);
addCommands();
fixCommands();
try
{
parser.parse(args);
}
catch (Exception e)
{
failAndPrintUsage(e.toString());
}
if (isHelp())
{
String cmd = parser.getParsedCommand();
if (cmd == null)
{
parser.usage();
}
else
{
parser.usage(cmd);
}
}
else if (isListCommands())
{
for (String cmd : commands.keySet())
{
out.println(String.format("%8s - %s", cmd, parser.getCommandDescription(cmd)));
}
}
else
{
cmd = commands.get(parser.getParsedCommand());
if (cmd == null)
{
failAndPrintUsage();
}
}
}
catch (CommandAbortedError error)
{
for (String m : error.messages)
{
err.println(m);
}
if (isVerbose() && error.getCause() != null)
{
error.getCause().printStackTrace(err);
}
if (error.printUsage && parser != null)
{
printUsage(parser, out, parser.getParsedCommand());
}
}
catch (Throwable e)
{
e.printStackTrace(err);
}
}
void printUsage(JCommander parser, PrintStream out, String optionalCommand)
{
StringBuilder sb = new StringBuilder();
if (optionalCommand != null)
parser.usage(sb, optionalCommand);
else
parser.usage(sb);
out.println(sb.toString());
}
public boolean run(final NodeProbe probe, final Output output)
{
PrintStream out = output.out;
PrintStream err = output.err;
try
{
setJmxConnInfo(probe);
if (cmd != null)
cmd.run();
return true;
}
catch (CommandAbortedError error)
{
for (String m : error.messages)
{
err.println(m);
}
if (isVerbose() && error.getCause() != null)
{
error.getCause().printStackTrace(err);
}
if (error.printUsage && parser != null)
{
printUsage(parser, out, parser.getParsedCommand());
}
return true;
}
catch (Throwable e)
{
e.printStackTrace(err);
}
// abnormal termination
return false;
}
private void setJmxConnInfo(final NodeProbe probe) throws IllegalAccessException
{
Field f = jmxConnectionInfoField(cmd);
if (f != null)
{
f.setAccessible(true);
f.set(cmd, new JmxConnectionInfo(this)
{
public MBeanServerConnection getMServer()
{
return probe.getMbeanServerConn();
}
});
}
f = pidField(cmd);
if (f != null)
{
long pid = probe.getPid();
f.setAccessible(true);
if (f.getType() == int.class)
f.setInt(cmd, (int) pid);
if (f.getType() == long.class)
f.setLong(cmd, pid);
if (f.getType() == String.class)
f.set(cmd, Long.toString(pid));
}
}
private boolean isHelp()
{
try
{
Field f = CommandLauncher.class.getDeclaredField("help");
f.setAccessible(true);
return f.getBoolean(this);
}
catch (Exception e)
{
throw new RuntimeException(e);
}
}
private boolean isListCommands()
{
try
{
Field f = CommandLauncher.class.getDeclaredField("listCommands");
f.setAccessible(true);
return f.getBoolean(this);
}
catch (Exception e)
{
throw new RuntimeException(e);
}
}
protected List getCommandPackages()
{
return Collections.singletonList("org.gridkit.jvmtool.cmd");
}
private void addCommands() throws InstantiationException, IllegalAccessException
{
for (String pack : getCommandPackages())
{
for (Class c : findClasses(pack))
{
if (CommandLauncher.CmdRef.class.isAssignableFrom(c))
{
CommandLauncher.CmdRef cmd = (CommandLauncher.CmdRef) c.newInstance();
String cmdName = cmd.getCommandName();
Runnable cmdTask = cmd.newCommand(this);
if (commands.containsKey(cmdName))
{
fail("Ambiguous implementation for '" + cmdName + '\'');
}
commands.put(cmdName, cmdTask);
parser.addCommand(cmdName, cmdTask);
}
}
}
}
private void fixCommands() throws Exception
{
List fields = Arrays.asList(JCommander.class.getDeclaredField("m_fields"),
JCommander.class.getDeclaredField("m_requiredFields"));
for (Field f : fields)
f.setAccessible(true);
for (JCommander cmdr : parser.getCommands().values())
{
for (Field field : fields) {
Map fieldsMap = (Map) field.get(cmdr);
for (Iterator> iPar = fieldsMap.entrySet().iterator(); iPar.hasNext(); )
{
Map.Entry par = iPar.next();
switch (par.getKey().getName())
{
// JmxConnectionInfo fields
case "pid":
case "sockAddr":
case "user":
case "password":
//
case "verbose":
case "help":
case "listCommands":
iPar.remove();
break;
}
}
}
}
}
boolean requiresMbeanServerConn()
{
return jmxConnectionInfoField(cmd) != null || pidField(cmd) != null;
}
private static Field jmxConnectionInfoField(Runnable cmd)
{
if (cmd == null)
return null;
for (Field f : cmd.getClass().getDeclaredFields())
{
if (f.getType() == JmxConnectionInfo.class)
{
return f;
}
}
return null;
}
private static Field pidField(Runnable cmd)
{
if (cmd == null)
return null;
for (Field f : cmd.getClass().getDeclaredFields())
{
if ("pid".equals(f.getName()) &&
(f.getType() == int.class || f.getType() == long.class || f.getType() == String.class))
{
return f;
}
}
return null;
}
private static List> findClasses(String packageName)
{
// TODO this will probably fail with JPMS/Jigsaw
List> result = new ArrayList<>();
try
{
String path = packageName.replace('.', '/');
for (String f : findFiles(path))
{
if (f.endsWith(".class") && f.indexOf('$') < 0)
{
f = f.substring(0, f.length() - ".class".length());
f = f.replace('/', '.');
result.add(Class.forName(f));
}
}
return result;
}
catch (Exception e)
{
throw new RuntimeException(e);
}
}
static List findFiles(String path) throws IOException
{
List result = new ArrayList<>();
ClassLoader cl = Thread.currentThread().getContextClassLoader();
Enumeration en = cl.getResources(path);
while (en.hasMoreElements())
{
URL u = en.nextElement();
listFiles(result, u, path);
}
return result;
}
static void listFiles(List results, URL packageURL, String path) throws IOException
{
if (packageURL.getProtocol().equals("jar"))
{
String jarFileName;
Enumeration jarEntries;
String entryName;
// build jar file name, then loop through zipped entries
jarFileName = URLDecoder.decode(packageURL.getFile(), "UTF-8");
jarFileName = jarFileName.substring(5, jarFileName.indexOf('!'));
try (JarFile jf = new JarFile(jarFileName))
{
jarEntries = jf.entries();
while (jarEntries.hasMoreElements())
{
entryName = jarEntries.nextElement().getName();
if (entryName.startsWith(path))
{
results.add(entryName);
}
}
}
}
else
{
// loop through files in classpath
File dir = new File(packageURL.getFile());
String cp = dir.canonicalPath();
File root = dir;
while (true)
{
if (cp.equals(new File(root, path).canonicalPath()))
{
break;
}
root = root.parent();
}
listFiles(results, root, dir);
}
}
static void listFiles(List names, File root, File dir)
{
String rootPath = root.absolutePath();
if (dir.exists() && dir.isDirectory())
{
for (File file : dir.tryList())
{
if (file.isDirectory())
{
listFiles(names, root, file);
}
else
{
String name = file.absolutePath().substring(rootPath.length() + 1);
name = name.replace('\\', '/');
names.add(name);
}
}
}
}
}
}
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