| /** |
| * 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.distributedlog.protocol.util; |
| |
| import static com.google.common.base.Charsets.UTF_8; |
| |
| import io.netty.buffer.ByteBuf; |
| import java.nio.ByteBuffer; |
| import java.util.zip.CRC32; |
| import org.apache.distributedlog.DLSN; |
| import org.apache.distributedlog.exceptions.DLException; |
| import org.apache.distributedlog.exceptions.OwnershipAcquireFailedException; |
| import org.apache.distributedlog.thrift.service.ResponseHeader; |
| |
| /** |
| * With CRC embedded in the application, we have to keep track of per api crc. Ideally this |
| * would be done by thrift. |
| */ |
| public class ProtocolUtils { |
| |
| // For request payload checksum |
| private static final ThreadLocal<CRC32> requestCRC = new ThreadLocal<CRC32>() { |
| @Override |
| protected CRC32 initialValue() { |
| return new CRC32(); |
| } |
| }; |
| |
| /** |
| * Generate crc32 for WriteOp. |
| */ |
| public static Long writeOpCRC32(String stream, ByteBuf data) { |
| CRC32 crc = requestCRC.get(); |
| try { |
| crc.update(stream.getBytes(UTF_8)); |
| crc.update(data.nioBuffer()); |
| return crc.getValue(); |
| } finally { |
| crc.reset(); |
| } |
| } |
| |
| /** |
| * Generate crc32 for WriteOp. |
| */ |
| public static Long writeOpCRC32(String stream, ByteBuffer data) { |
| CRC32 crc = requestCRC.get(); |
| try { |
| crc.update(stream.getBytes(UTF_8)); |
| crc.update(data); |
| return crc.getValue(); |
| } finally { |
| crc.reset(); |
| } |
| } |
| |
| /** |
| * Generate crc32 for TruncateOp. |
| */ |
| public static Long truncateOpCRC32(String stream, DLSN dlsn) { |
| CRC32 crc = requestCRC.get(); |
| try { |
| crc.update(stream.getBytes(UTF_8)); |
| crc.update(dlsn.serializeBytes()); |
| return crc.getValue(); |
| } finally { |
| crc.reset(); |
| } |
| } |
| |
| /** |
| * Generate crc32 for any op which only passes a stream name. |
| */ |
| public static Long streamOpCRC32(String stream) { |
| CRC32 crc = requestCRC.get(); |
| try { |
| crc.update(stream.getBytes(UTF_8)); |
| return crc.getValue(); |
| } finally { |
| crc.reset(); |
| } |
| } |
| |
| public static DLException exception(ResponseHeader response) { |
| String errMsg; |
| switch (response.getCode()) { |
| case FOUND: |
| if (response.isSetErrMsg()) { |
| errMsg = response.getErrMsg(); |
| } else { |
| errMsg = "Request is redirected to " + response.getLocation(); |
| } |
| return new OwnershipAcquireFailedException(errMsg, response.getLocation()); |
| case SUCCESS: |
| throw new IllegalArgumentException("Can't instantiate an exception for success response."); |
| default: |
| if (response.isSetErrMsg()) { |
| errMsg = response.getErrMsg(); |
| } else { |
| errMsg = response.getCode().name(); |
| } |
| return new DLException(response.getCode().getValue(), errMsg); |
| } |
| } |
| } |