package org.apache.cassandra.db.compaction;
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 * 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
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 *   http://www.apache.org/licenses/LICENSE-2.0
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 * KIND, either express or implied.  See the License for the
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import java.io.RandomAccessFile;
import java.util.*;

import org.junit.After;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;

import org.apache.cassandra.SchemaLoader;
import org.apache.cassandra.Util;
import org.apache.cassandra.cache.ChunkCache;
import org.apache.cassandra.config.*;
import org.apache.cassandra.db.*;
import org.apache.cassandra.exceptions.ConfigurationException;
import org.apache.cassandra.io.sstable.format.SSTableReader;
import org.apache.cassandra.io.util.FileUtils;
import org.apache.cassandra.schema.*;

import static org.junit.Assert.assertTrue;

public class BlacklistingCompactionsTest
{
    private static final Logger logger = LoggerFactory.getLogger(BlacklistingCompactionsTest.class);

    private static Random random;

    private static final String KEYSPACE1 = "BlacklistingCompactionsTest";
    private static final String STANDARD_STCS = "Standard_STCS";
    private static final String STANDARD_LCS = "Standard_LCS";
    private static int maxValueSize;

    @After
    public void leakDetect() throws InterruptedException
    {
        System.gc();
        System.gc();
        System.gc();
        Thread.sleep(10);
    }

    @BeforeClass
    public static void defineSchema() throws ConfigurationException
    {
        long seed = System.nanoTime();
        //long seed = 754271160974509L; // CASSANDRA-9530: use this seed to reproduce compaction failures if reading empty rows
        logger.info("Seed {}", seed);
        random = new Random(seed);

        SchemaLoader.prepareServer();
        SchemaLoader.createKeyspace(KEYSPACE1,
                                    KeyspaceParams.simple(1),
                                    SchemaLoader.standardCFMD(KEYSPACE1, STANDARD_STCS).compaction(CompactionParams.DEFAULT),
                                    SchemaLoader.standardCFMD(KEYSPACE1, STANDARD_LCS).compaction(CompactionParams.lcs(Collections.emptyMap())));

        maxValueSize = DatabaseDescriptor.getMaxValueSize();
        DatabaseDescriptor.setMaxValueSize(1024 * 1024);
        closeStdErr();
    }

    @AfterClass
    public static void tearDown()
    {
        DatabaseDescriptor.setMaxValueSize(maxValueSize);
    }

    public static void closeStdErr()
    {
        // These tests generate an error message per CorruptSSTableException since it goes through
        // DebuggableThreadPoolExecutor, which will log it in afterExecute.  We could stop that by
        // creating custom CompactionStrategy and CompactionTask classes, but that's kind of a
        // ridiculous amount of effort, especially since those aren't really intended to be wrapped
        // like that.
        System.err.close();
    }

    @Test
    public void testBlacklistingWithSizeTieredCompactionStrategy() throws Exception
    {
        testBlacklisting(STANDARD_STCS);
    }

    @Test
    public void testBlacklistingWithLeveledCompactionStrategy() throws Exception
    {
        testBlacklisting(STANDARD_LCS);
    }

    private void testBlacklisting(String tableName) throws Exception
    {
        // this test does enough rows to force multiple block indexes to be used
        Keyspace keyspace = Keyspace.open(KEYSPACE1);
        final ColumnFamilyStore cfs = keyspace.getColumnFamilyStore(tableName);

        final int ROWS_PER_SSTABLE = 10;
        final int SSTABLES = cfs.metadata.params.minIndexInterval * 2 / ROWS_PER_SSTABLE;

        // disable compaction while flushing
        cfs.disableAutoCompaction();
        //test index corruption
        //now create a few new SSTables
        long maxTimestampExpected = Long.MIN_VALUE;
        Set<DecoratedKey> inserted = new HashSet<>();

        for (int j = 0; j < SSTABLES; j++)
        {
            for (int i = 0; i < ROWS_PER_SSTABLE; i++)
            {
                DecoratedKey key = Util.dk(String.valueOf(i));
                long timestamp = j * ROWS_PER_SSTABLE + i;
                new RowUpdateBuilder(cfs.metadata, timestamp, key.getKey())
                        .clustering("cols" + "i")
                        .add("val", "val" + i)
                        .build()
                        .applyUnsafe();
                maxTimestampExpected = Math.max(timestamp, maxTimestampExpected);
                inserted.add(key);
            }
            cfs.forceBlockingFlush();
            CompactionsTest.assertMaxTimestamp(cfs, maxTimestampExpected);
            assertEquals(inserted.toString(), inserted.size(), Util.getAll(Util.cmd(cfs).build()).size());
        }

        Collection<SSTableReader> sstables = cfs.getLiveSSTables();
        int currentSSTable = 0;
        int sstablesToCorrupt = 8;

        // corrupt first 'sstablesToCorrupt' SSTables
        for (SSTableReader sstable : sstables)
        {
            if (currentSSTable + 1 > sstablesToCorrupt)
                break;

            RandomAccessFile raf = null;

            try
            {
                int corruptionSize = 50;
                raf = new RandomAccessFile(sstable.getFilename(), "rw");
                assertNotNull(raf);
                assertTrue(raf.length() > corruptionSize);
                raf.seek(random.nextInt((int)(raf.length() - corruptionSize)));
                // We want to write something large enough that the corruption cannot get undetected
                // (even without compression)
                byte[] corruption = new byte[corruptionSize];
                random.nextBytes(corruption);
                raf.write(corruption);
                if (ChunkCache.instance != null)
                    ChunkCache.instance.invalidateFile(sstable.getFilename());

            }
            finally
            {
                FileUtils.closeQuietly(raf);
            }

            currentSSTable++;
        }

        int failures = 0;

        // in case something will go wrong we don't want to loop forever using for (;;)
        for (int i = 0; i < sstables.size(); i++)
        {
            try
            {
                cfs.forceMajorCompaction();
            }
            catch (Exception e)
            {
                // kind of a hack since we're not specifying just CorruptSSTableExceptions, or (what we actually expect)
                // an ExecutionException wrapping a CSSTE.  This is probably Good Enough though, since if there are
                // other errors in compaction presumably the other tests would bring that to light.
                failures++;
                continue;
            }
            break;
        }

        cfs.truncateBlocking();
        assertEquals(sstablesToCorrupt, failures);
    }
}