/*
 * 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.hadoop.hbase.util;

import java.io.IOException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.CompoundConfiguration;
import org.apache.hadoop.hbase.DoNotRetryIOException;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.ColumnFamilyDescriptor;
import org.apache.hadoop.hbase.client.ColumnFamilyDescriptorBuilder;
import org.apache.hadoop.hbase.client.TableDescriptor;
import org.apache.hadoop.hbase.client.TableDescriptorBuilder;
import org.apache.hadoop.hbase.fs.ErasureCodingUtils;
import org.apache.hadoop.hbase.regionserver.DefaultStoreEngine;
import org.apache.hadoop.hbase.regionserver.HStore;
import org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost;
import org.apache.hadoop.hbase.regionserver.RegionSplitPolicy;
import org.apache.hadoop.hbase.regionserver.compactions.ExploringCompactionPolicy;
import org.apache.hadoop.hbase.regionserver.compactions.FIFOCompactionPolicy;
import org.apache.yetus.audience.InterfaceAudience;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.apache.hadoop.hbase.shaded.protobuf.generated.WALProtos;

/**
 * Only used for master to sanity check {@link org.apache.hadoop.hbase.client.TableDescriptor}.
 */
@InterfaceAudience.Private
public final class TableDescriptorChecker {
  private static Logger LOG = LoggerFactory.getLogger(TableDescriptorChecker.class);

  public static final String TABLE_SANITY_CHECKS = "hbase.table.sanity.checks";
  public static final boolean DEFAULT_TABLE_SANITY_CHECKS = true;

  // should we check the compression codec type at master side, default true, HBASE-6370
  public static final String MASTER_CHECK_COMPRESSION = "hbase.master.check.compression";
  public static final boolean DEFAULT_MASTER_CHECK_COMPRESSION = true;

  // should we check encryption settings at master side, default true
  public static final String MASTER_CHECK_ENCRYPTION = "hbase.master.check.encryption";
  public static final boolean DEFAULT_MASTER_CHECK_ENCRYPTION = true;

  private TableDescriptorChecker() {
  }

  private static boolean shouldSanityCheck(final Configuration conf) {
    if (conf.getBoolean(TABLE_SANITY_CHECKS, DEFAULT_TABLE_SANITY_CHECKS)) {
      return true;
    }
    return false;
  }

  /**
   * Checks whether the table conforms to some sane limits, and configured values (compression, etc)
   * work. Throws an exception if something is wrong.
   */
  public static void sanityCheck(final Configuration c, final TableDescriptor td)
    throws IOException {
    CompoundConfiguration conf = new CompoundConfiguration().add(c).addBytesMap(td.getValues());

    // Setting logs to warning instead of throwing exception if sanityChecks are disabled
    boolean logWarn = !shouldSanityCheck(conf);

    // check max file size
    long maxFileSizeLowerLimit = 2 * 1024 * 1024L; // 2M is the default lower limit
    // if not set MAX_FILESIZE in TableDescriptor, and not set HREGION_MAX_FILESIZE in
    // hbase-site.xml, use maxFileSizeLowerLimit instead to skip this check
    long maxFileSize = td.getValue(TableDescriptorBuilder.MAX_FILESIZE) == null
      ? conf.getLong(HConstants.HREGION_MAX_FILESIZE, maxFileSizeLowerLimit)
      : Long.parseLong(td.getValue(TableDescriptorBuilder.MAX_FILESIZE));
    if (maxFileSize < conf.getLong("hbase.hregion.max.filesize.limit", maxFileSizeLowerLimit)) {
      String message = "MAX_FILESIZE for table descriptor or " + "\"hbase.hregion.max.filesize\" ("
        + maxFileSize + ") is too small, which might cause over splitting into unmanageable "
        + "number of regions.";
      warnOrThrowExceptionForFailure(logWarn, message, null);
    }

    // check flush size
    long flushSizeLowerLimit = 1024 * 1024L; // 1M is the default lower limit
    // if not set MEMSTORE_FLUSHSIZE in TableDescriptor, and not set HREGION_MEMSTORE_FLUSH_SIZE in
    // hbase-site.xml, use flushSizeLowerLimit instead to skip this check
    long flushSize = td.getValue(TableDescriptorBuilder.MEMSTORE_FLUSHSIZE) == null
      ? conf.getLong(HConstants.HREGION_MEMSTORE_FLUSH_SIZE, flushSizeLowerLimit)
      : Long.parseLong(td.getValue(TableDescriptorBuilder.MEMSTORE_FLUSHSIZE));
    if (flushSize < conf.getLong("hbase.hregion.memstore.flush.size.limit", flushSizeLowerLimit)) {
      String message =
        "MEMSTORE_FLUSHSIZE for table descriptor or " + "\"hbase.hregion.memstore.flush.size\" ("
          + flushSize + ") is too small, which might cause" + " very frequent flushing.";
      warnOrThrowExceptionForFailure(logWarn, message, null);
    }

    // check that coprocessors and other specified plugin classes can be loaded
    checkClassLoading(conf, td);

    if (conf.getBoolean(MASTER_CHECK_COMPRESSION, DEFAULT_MASTER_CHECK_COMPRESSION)) {
      // check compression can be loaded
      checkCompression(conf, td);
    }

    if (conf.getBoolean(MASTER_CHECK_ENCRYPTION, DEFAULT_MASTER_CHECK_ENCRYPTION)) {
      // check encryption can be loaded
      checkEncryption(conf, td);
    }

    // Verify compaction policy
    checkCompactionPolicy(conf, td);
    // check that we have at least 1 CF
    if (td.getColumnFamilyCount() == 0) {
      String message = "Table should have at least one column family.";
      warnOrThrowExceptionForFailure(logWarn, message, null);
    }

    // check that we have minimum 1 region replicas
    int regionReplicas = td.getRegionReplication();
    if (regionReplicas < 1) {
      String message = "Table region replication should be at least one.";
      warnOrThrowExceptionForFailure(logWarn, message, null);
    }

    // Meta table shouldn't be set as read only, otherwise it will impact region assignments
    if (td.isReadOnly() && TableName.isMetaTableName(td.getTableName())) {
      warnOrThrowExceptionForFailure(false, "Meta table can't be set as read only.", null);
    }

    // check replication scope
    checkReplicationScope(conf, td);

    // check bloom filter type
    checkBloomFilterType(conf, td);

    if (td.getErasureCodingPolicy() != null) {
      warnOrThrowExceptionForFailure(logWarn,
        () -> ErasureCodingUtils.verifySupport(conf, td.getErasureCodingPolicy()));
    }

    for (ColumnFamilyDescriptor hcd : td.getColumnFamilies()) {
      if (hcd.getTimeToLive() <= 0) {
        String message = "TTL for column family " + hcd.getNameAsString() + " must be positive.";
        warnOrThrowExceptionForFailure(logWarn, message, null);
      }

      // check blockSize
      if (hcd.getBlocksize() < 1024 || hcd.getBlocksize() > 16 * 1024 * 1024) {
        String message = "Block size for column family " + hcd.getNameAsString()
          + "  must be between 1K and 16MB.";
        warnOrThrowExceptionForFailure(logWarn, message, null);
      }

      // check versions
      if (hcd.getMinVersions() < 0) {
        String message =
          "Min versions for column family " + hcd.getNameAsString() + "  must be positive.";
        warnOrThrowExceptionForFailure(logWarn, message, null);
      }
      // max versions already being checked

      // HBASE-13776 Setting illegal versions for ColumnFamilyDescriptor
      // does not throw IllegalArgumentException
      // check minVersions <= maxVerions
      if (hcd.getMinVersions() > hcd.getMaxVersions()) {
        String message = "Min versions for column family " + hcd.getNameAsString()
          + " must be less than the Max versions.";
        warnOrThrowExceptionForFailure(logWarn, message, null);
      }

      // check data replication factor, it can be 0(default value) when user has not explicitly
      // set the value, in this case we use default replication factor set in the file system.
      if (hcd.getDFSReplication() < 0) {
        String message = "HFile Replication for column family " + hcd.getNameAsString()
          + "  must be greater than zero.";
        warnOrThrowExceptionForFailure(logWarn, message, null);
      }

      // check in-memory compaction
      warnOrThrowExceptionForFailure(logWarn, hcd::getInMemoryCompaction);
    }
  }

  private static void checkReplicationScope(final Configuration conf, final TableDescriptor td)
    throws IOException {
    warnOrThrowExceptionForFailure(conf, () -> {
      for (ColumnFamilyDescriptor cfd : td.getColumnFamilies()) {
        // check replication scope
        WALProtos.ScopeType scop = WALProtos.ScopeType.valueOf(cfd.getScope());
        if (scop == null) {
          String message = "Replication scope for column family " + cfd.getNameAsString() + " is "
            + cfd.getScope() + " which is invalid.";

          throw new DoNotRetryIOException(message);
        }
      }
    });
  }

  private static void checkCompactionPolicy(final Configuration conf, final TableDescriptor td)
    throws IOException {
    warnOrThrowExceptionForFailure(false, () -> {
      // FIFO compaction has some requirements
      // Actually FCP ignores periodic major compactions
      String className = td.getValue(DefaultStoreEngine.DEFAULT_COMPACTION_POLICY_CLASS_KEY);
      if (className == null) {
        className = conf.get(DefaultStoreEngine.DEFAULT_COMPACTION_POLICY_CLASS_KEY,
          ExploringCompactionPolicy.class.getName());
      }

      int blockingFileCount = HStore.DEFAULT_BLOCKING_STOREFILE_COUNT;
      String sv = td.getValue(HStore.BLOCKING_STOREFILES_KEY);
      if (sv != null) {
        blockingFileCount = Integer.parseInt(sv);
      } else {
        blockingFileCount = conf.getInt(HStore.BLOCKING_STOREFILES_KEY, blockingFileCount);
      }

      for (ColumnFamilyDescriptor hcd : td.getColumnFamilies()) {
        String compactionPolicy =
          hcd.getConfigurationValue(DefaultStoreEngine.DEFAULT_COMPACTION_POLICY_CLASS_KEY);
        if (compactionPolicy == null) {
          compactionPolicy = className;
        }
        if (!compactionPolicy.equals(FIFOCompactionPolicy.class.getName())) {
          continue;
        }
        // FIFOCompaction
        String message = null;

        // 1. Check TTL
        if (hcd.getTimeToLive() == ColumnFamilyDescriptorBuilder.DEFAULT_TTL) {
          message = "Default TTL is not supported for FIFO compaction";
          throw new IOException(message);
        }

        // 2. Check min versions
        if (hcd.getMinVersions() > 0) {
          message = "MIN_VERSION > 0 is not supported for FIFO compaction";
          throw new IOException(message);
        }

        // 3. blocking file count
        sv = hcd.getConfigurationValue(HStore.BLOCKING_STOREFILES_KEY);
        if (sv != null) {
          blockingFileCount = Integer.parseInt(sv);
        }
        if (blockingFileCount < 1000) {
          message =
            "Blocking file count '" + HStore.BLOCKING_STOREFILES_KEY + "' " + blockingFileCount
              + " is below recommended minimum of 1000 for column family " + hcd.getNameAsString();
          throw new IOException(message);
        }
      }
    });
  }

  private static void checkBloomFilterType(final Configuration conf, final TableDescriptor td)
    throws IOException {
    warnOrThrowExceptionForFailure(conf, () -> {
      for (ColumnFamilyDescriptor cfd : td.getColumnFamilies()) {
        Configuration cfdConf = new CompoundConfiguration().addStringMap(cfd.getConfiguration());
        try {
          BloomFilterUtil.getBloomFilterParam(cfd.getBloomFilterType(), cfdConf);
        } catch (IllegalArgumentException e) {
          throw new DoNotRetryIOException("Failed to get bloom filter param", e);
        }
      }
    });
  }

  public static void checkCompression(final Configuration conf, final TableDescriptor td)
    throws IOException {
    warnOrThrowExceptionForFailure(conf, () -> {
      for (ColumnFamilyDescriptor cfd : td.getColumnFamilies()) {
        CompressionTest.testCompression(cfd.getCompressionType());
        CompressionTest.testCompression(cfd.getCompactionCompressionType());
        CompressionTest.testCompression(cfd.getMajorCompactionCompressionType());
        CompressionTest.testCompression(cfd.getMinorCompactionCompressionType());
      }
    });
  }

  public static void checkEncryption(final Configuration conf, final TableDescriptor td)
    throws IOException {
    warnOrThrowExceptionForFailure(conf, () -> {
      for (ColumnFamilyDescriptor cfd : td.getColumnFamilies()) {
        EncryptionTest.testEncryption(conf, cfd.getEncryptionType(), cfd.getEncryptionKey());
      }
    });
  }

  public static void checkClassLoading(final Configuration conf, final TableDescriptor td)
    throws IOException {
    warnOrThrowExceptionForFailure(conf, () -> {
      RegionSplitPolicy.getSplitPolicyClass(td, conf);
      RegionCoprocessorHost.testTableCoprocessorAttrs(conf, td);
    });
  }

  // HBASE-13350 - Helper method to log warning on sanity check failures if checks disabled.
  private static void warnOrThrowExceptionForFailure(boolean logWarn, String message,
    Exception cause) throws IOException {
    if (!logWarn) {
      throw new DoNotRetryIOException(message + " Set " + TABLE_SANITY_CHECKS
        + " to false at conf or table descriptor if you want to bypass sanity checks", cause);
    }
    LOG.warn(message);
  }

  private static void warnOrThrowExceptionForFailure(Configuration conf, ThrowingRunnable runnable)
    throws IOException {
    boolean logWarn = !shouldSanityCheck(conf);
    warnOrThrowExceptionForFailure(logWarn, runnable);
  }

  private static void warnOrThrowExceptionForFailure(boolean logWarn, ThrowingRunnable runnable)
    throws IOException {
    try {
      runnable.run();
    } catch (Exception e) {
      warnOrThrowExceptionForFailure(logWarn, e.getMessage(), e);
    }
  }

  @FunctionalInterface
  interface ThrowingRunnable {
    void run() throws Exception;
  }
}