org.apache.accumulo.server.util.DumpZookeeper.java Source code

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Here is the source code for org.apache.accumulo.server.util.DumpZookeeper.java

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/*
 * 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.accumulo.server.util;

import java.io.PrintStream;
import java.io.UnsupportedEncodingException;

import org.apache.accumulo.core.Constants;
import org.apache.accumulo.core.cli.Help;
import org.apache.accumulo.fate.zookeeper.IZooReaderWriter;
import org.apache.accumulo.server.zookeeper.ZooReaderWriter;
import org.apache.commons.codec.binary.Base64;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.data.Stat;

import com.beust.jcommander.Parameter;

public class DumpZookeeper {

    static IZooReaderWriter zk = null;

    private static final Logger log = Logger.getLogger(DumpZookeeper.class);

    private static class Encoded {
        public String encoding;
        public String value;

        Encoded(String e, String v) {
            encoding = e;
            value = v;
        }
    }

    static class Opts extends Help {
        @Parameter(names = "--root", description = "the root of the znode tree to dump")
        String root = "/";
    }

    public static void main(String[] args) {
        Opts opts = new Opts();
        opts.parseArgs(DumpZookeeper.class.getName(), args);

        Logger.getRootLogger().setLevel(Level.WARN);
        PrintStream out = System.out;
        try {
            zk = ZooReaderWriter.getInstance();

            write(out, 0, "<dump root='%s'>", opts.root);
            for (String child : zk.getChildren(opts.root, null))
                if (!child.equals("zookeeper"))
                    dump(out, opts.root, child, 1);
            write(out, 0, "</dump>");
        } catch (Exception ex) {
            log.error(ex, ex);
        }
    }

    private static void dump(PrintStream out, String root, String child, int indent)
            throws KeeperException, InterruptedException, UnsupportedEncodingException {
        String path = root + "/" + child;
        if (root.endsWith("/"))
            path = root + child;
        Stat stat = zk.getStatus(path);
        if (stat == null)
            return;
        String type = "node";
        if (stat.getEphemeralOwner() != 0) {
            type = "ephemeral";
        }
        if (stat.getNumChildren() == 0) {
            if (stat.getDataLength() == 0) {
                write(out, indent, "<%s name='%s'/>", type, child);
            } else {
                Encoded value = value(path);
                write(out, indent, "<%s name='%s' encoding='%s' value='%s'/>", type, child, value.encoding,
                        value.value);
            }
        } else {
            if (stat.getDataLength() == 0) {
                write(out, indent, "<%s name='%s'>", type, child);
            } else {
                Encoded value = value(path);
                write(out, indent, "<%s name='%s' encoding='%s' value='%s'>", type, child, value.encoding,
                        value.value);
            }
            for (String c : zk.getChildren(path, null)) {
                dump(out, path, c, indent + 1);
            }
            write(out, indent, "</node>");
        }
    }

    private static Encoded value(String path)
            throws KeeperException, InterruptedException, UnsupportedEncodingException {
        byte[] data = zk.getData(path, null);
        for (int i = 0; i < data.length; i++) {
            // does this look like simple ascii?
            if (data[i] < ' ' || data[i] > '~')
                return new Encoded("base64", new String(Base64.encodeBase64(data), Constants.UTF8));
        }
        return new Encoded(Constants.UTF8.name(), new String(data, Constants.UTF8));
    }

    private static void write(PrintStream out, int indent, String fmt, Object... args) {
        for (int i = 0; i < indent; i++)
            out.print(" ");
        out.println(String.format(fmt, args));
    }
}