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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.cassandra.tools;

import org.apache.cassandra.config.Schema;
import org.apache.cassandra.db.ColumnFamilyStore;
import org.apache.cassandra.db.Directories;
import org.apache.cassandra.db.Keyspace;
import org.apache.cassandra.db.compaction.*;
import org.apache.cassandra.io.sstable.Component;
import org.apache.cassandra.io.sstable.CorruptSSTableException;
import org.apache.cassandra.io.sstable.Descriptor;
import org.apache.cassandra.io.sstable.format.SSTableReader;
import org.apache.cassandra.utils.JVMStabilityInspector;
import org.apache.cassandra.utils.OutputHandler;
import org.apache.commons.cli.*;

import java.util.*;
import java.util.concurrent.TimeUnit;

import static org.apache.cassandra.tools.BulkLoader.CmdLineOptions;

public class StandaloneVerifier
{
    private static final String TOOL_NAME = "sstableverify";
    private static final String VERBOSE_OPTION  = "verbose";
    private static final String EXTENDED_OPTION = "extended";
    private static final String DEBUG_OPTION  = "debug";
    private static final String HELP_OPTION  = "help";

    public static void main(String args[])
    {
        Options options = Options.parseArgs(args);
        Util.initDatabaseDescriptor();

        try
        {
            // load keyspace descriptions.
            Schema.instance.loadFromDisk(false);

            boolean hasFailed = false;

            if (Schema.instance.getCFMetaData(options.keyspaceName, options.cfName) == null)
                throw new IllegalArgumentException(String.format("Unknown keyspace/table %s.%s",
                                                                 options.keyspaceName,
                                                                 options.cfName));

            // Do not load sstables since they might be broken
            Keyspace keyspace = Keyspace.openWithoutSSTables(options.keyspaceName);
            ColumnFamilyStore cfs = keyspace.getColumnFamilyStore(options.cfName);

            OutputHandler handler = new OutputHandler.SystemOutput(options.verbose, options.debug);
            Directories.SSTableLister lister = cfs.getDirectories().sstableLister(Directories.OnTxnErr.THROW).skipTemporary(true);

            boolean extended = options.extended;

            List sstables = new ArrayList<>();

            // Verify sstables
            for (Map.Entry> entry : lister.list().entrySet())
            {
                Set components = entry.getValue();
                if (!components.contains(Component.DATA) || !components.contains(Component.PRIMARY_INDEX))
                    continue;

                try
                {
                    SSTableReader sstable = SSTableReader.openNoValidation(entry.getKey(), components, cfs);
                    sstables.add(sstable);
                }
                catch (Exception e)
                {
                    JVMStabilityInspector.inspectThrowable(e);
                    System.err.println(String.format("Error Loading %s: %s", entry.getKey(), e.getMessage()));
                    if (options.debug)
                        e.printStackTrace(System.err);
                }
            }

            for (SSTableReader sstable : sstables)
            {
                try
                {

                    try (Verifier verifier = new Verifier(cfs, sstable, handler, true))
                    {
                        verifier.verify(extended);
                    }
                    catch (CorruptSSTableException cs)
                    {
                        System.err.println(String.format("Error verifying %s: %s", sstable, cs.getMessage()));
                        hasFailed = true;
                    }
                }
                catch (Exception e)
                {
                    System.err.println(String.format("Error verifying %s: %s", sstable, e.getMessage()));
                    e.printStackTrace(System.err);
                }
            }

            CompactionManager.instance.finishCompactionsAndShutdown(5, TimeUnit.MINUTES);

            System.exit( hasFailed ? 1 : 0 ); // We need that to stop non daemonized threads
        }
        catch (Exception e)
        {
            System.err.println(e.getMessage());
            if (options.debug)
                e.printStackTrace(System.err);
            System.exit(1);
        }
    }

    private static class Options
    {
        public final String keyspaceName;
        public final String cfName;

        public boolean debug;
        public boolean verbose;
        public boolean extended;

        private Options(String keyspaceName, String cfName)
        {
            this.keyspaceName = keyspaceName;
            this.cfName = cfName;
        }

        public static Options parseArgs(String cmdArgs[])
        {
            CommandLineParser parser = new GnuParser();
            CmdLineOptions options = getCmdLineOptions();
            try
            {
                CommandLine cmd = parser.parse(options, cmdArgs, false);

                if (cmd.hasOption(HELP_OPTION))
                {
                    printUsage(options);
                    System.exit(0);
                }

                String[] args = cmd.getArgs();
                if (args.length != 2)
                {
                    String msg = args.length < 2 ? "Missing arguments" : "Too many arguments";
                    System.err.println(msg);
                    printUsage(options);
                    System.exit(1);
                }

                String keyspaceName = args[0];
                String cfName = args[1];

                Options opts = new Options(keyspaceName, cfName);

                opts.debug = cmd.hasOption(DEBUG_OPTION);
                opts.verbose = cmd.hasOption(VERBOSE_OPTION);
                opts.extended = cmd.hasOption(EXTENDED_OPTION);

                return opts;
            }
            catch (ParseException e)
            {
                errorMsg(e.getMessage(), options);
                return null;
            }
        }

        private static void errorMsg(String msg, CmdLineOptions options)
        {
            System.err.println(msg);
            printUsage(options);
            System.exit(1);
        }

        private static CmdLineOptions getCmdLineOptions()
        {
            CmdLineOptions options = new CmdLineOptions();
            options.addOption(null, DEBUG_OPTION,          "display stack traces");
            options.addOption("e",  EXTENDED_OPTION,       "extended verification");
            options.addOption("v",  VERBOSE_OPTION,        "verbose output");
            options.addOption("h",  HELP_OPTION,           "display this help message");
            return options;
        }

        public static void printUsage(CmdLineOptions options)
        {
            String usage = String.format("%s [options]  ", TOOL_NAME);
            StringBuilder header = new StringBuilder();
            header.append("--\n");
            header.append("Verify the sstable for the provided table." );
            header.append("\n--\n");
            header.append("Options are:");
            new HelpFormatter().printHelp(usage, header.toString(), options, "");
        }
    }
}