content: /*
   * 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.bookkeeper.client;
  
  import static java.nio.charset.StandardCharsets.UTF_8;
  
  import io.netty.buffer.ByteBuf;
  import io.netty.buffer.Unpooled;
  import io.netty.buffer.UnpooledByteBufAllocator;
  import java.security.GeneralSecurityException;
  import java.util.function.Function;
  import org.apache.bookkeeper.client.api.LedgerMetadata;
  import org.apache.bookkeeper.meta.LedgerManager;
  import org.apache.bookkeeper.proto.DataFormats.LedgerMetadataFormat.DigestType;
  import org.apache.bookkeeper.proto.MockBookieClient;
  import org.apache.bookkeeper.proto.checksum.DigestManager;
  import org.apache.bookkeeper.versioning.Versioned;
  
  /**
   * Client utilities.
   */
  public class ClientUtil {
      public static final org.apache.bookkeeper.client.api.DigestType DIGEST_TYPE =
          org.apache.bookkeeper.client.api.DigestType.CRC32C;
      public static final byte[] PASSWD = "foobar".getBytes(UTF_8);
  
      public static ByteBuf generatePacket(long ledgerId, long entryId, long lastAddConfirmed,
                                                 long length, byte[] data) throws GeneralSecurityException {
          return generatePacket(ledgerId, entryId, lastAddConfirmed, length, data, 0, data.length);
      }
  
      public static ByteBuf generatePacket(long ledgerId, long entryId, long lastAddConfirmed, long length, byte[] data,
              int offset, int len) throws GeneralSecurityException {
          DigestManager dm = DigestManager.instantiate(ledgerId, new byte[2], DigestType.CRC32,
                  UnpooledByteBufAllocator.DEFAULT, true);
          return MockBookieClient.copyDataWithSkipHeader(dm.computeDigestAndPackageForSending(entryId, lastAddConfirmed,
              length, Unpooled.wrappedBuffer(data, offset, len), new byte[20], 0));
      }
  
      /**
       * Returns that whether ledger is in open state.
       */
      public static boolean isLedgerOpen(LedgerHandle handle) {
          return !handle.getLedgerMetadata().isClosed();
      }
  
      public static Versioned<LedgerMetadata> setupLedger(ClientContext clientCtx, long ledgerId,
                                                          LedgerMetadataBuilder builder) throws Exception {
          return setupLedger(clientCtx.getLedgerManager(), ledgerId, builder);
      }
  
      public static Versioned<LedgerMetadata> setupLedger(LedgerManager ledgerManager, long ledgerId,
                                                          LedgerMetadataBuilder builder) throws Exception {
          LedgerMetadata md = builder.withPassword(PASSWD).withDigestType(DIGEST_TYPE).withId(ledgerId).build();
          return ledgerManager.createLedgerMetadata(ledgerId, md).get();
      }
  
      public static Versioned<LedgerMetadata> transformMetadata(ClientContext clientCtx, long ledgerId,
                                                                Function<LedgerMetadata, LedgerMetadata> transform)
              throws Exception {
          return transformMetadata(clientCtx.getLedgerManager(), ledgerId, transform);
      }
  
      public static Versioned<LedgerMetadata> transformMetadata(LedgerManager ledgerManager, long ledgerId,
                                                                Function<LedgerMetadata, LedgerMetadata> transform)
              throws Exception {
          Versioned<LedgerMetadata> current = ledgerManager.readLedgerMetadata(ledgerId).get();
          return ledgerManager.writeLedgerMetadata(ledgerId, transform.apply(current.getValue()),
                                                   current.getVersion()).get();
      }
  
  }
  