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/*
* Copyright (c) 2018 Cisco Systems. All rights reserved.
*
* Licensed 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.
*/
/**
* Name: DataPlatformEventDecoder
* Purpose: Encodes and secodes binary event data from kafka to/from a DataPlatformEvent object
* Author: PNDA team
*
* Created: 07/04/2016
*/
package com.cisco.pnda.model;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import org.apache.avro.Schema;
import org.apache.avro.generic.GenericData;
import org.apache.avro.generic.GenericDatumReader;
import org.apache.avro.generic.GenericDatumWriter;
import org.apache.avro.generic.GenericRecord;
import org.apache.avro.io.BinaryEncoder;
import org.apache.avro.io.DatumReader;
import org.apache.avro.io.DatumWriter;
import org.apache.avro.io.Decoder;
import org.apache.avro.io.DecoderFactory;
import org.apache.avro.io.EncoderFactory;
import org.apache.log4j.Logger;
public class DataPlatformEventCodec
{
private static final Logger LOGGER = Logger.getLogger(DataPlatformEventCodec.class.getName());
private Schema.Parser _parser = new Schema.Parser();
private DatumReader<GenericRecord> _reader;
private DatumWriter<GenericRecord> _writer;
private Schema _schema;
private String _schemaDef;
public DataPlatformEventCodec(String schemaDef) throws IOException
{
_schemaDef = schemaDef;
_schema = _parser.parse(schemaDef);
_reader = new GenericDatumReader<GenericRecord>(_schema);
_writer = new GenericDatumWriter<GenericRecord>(_schema);
}
public DataPlatformEvent decode(byte[] data) throws IOException
{
try
{
Decoder decoder = DecoderFactory.get().binaryDecoder(data, null);
GenericRecord r = _reader.read(null, decoder);
return new DataPlatformEvent((String) r.get("src").toString(),
(Long) r.get("timestamp"),
(String) r.get("host_ip").toString(),
new String(((ByteBuffer)r.get("rawdata")).array()));
}
catch(Exception ex)
{
LOGGER.error("data:" + hexStr(data) + " schema: " + _schemaDef, ex);
throw new IOException(ex);
}
}
final protected static char[] hexArray = "0123456789ABCDEF".toCharArray();
public static String hexStr(byte[] bytes) {
char[] hexChars = new char[bytes.length * 2];
for ( int j = 0; j < bytes.length; j++ ) {
int v = bytes[j] & 0xFF;
hexChars[j * 2] = hexArray[v >>> 4];
hexChars[j * 2 + 1] = hexArray[v & 0x0F];
}
return new String(hexChars);
}
public byte[] encode(DataPlatformEvent e) throws IOException
{
ByteArrayOutputStream out = new ByteArrayOutputStream();
BinaryEncoder encoder = EncoderFactory.get().binaryEncoder(out, null);
GenericRecord datum = new GenericData.Record(_schema);
datum.put("src", e.getSrc());
datum.put("timestamp", e.getTimestamp());
datum.put("host_ip", e.getHostIp());
datum.put("rawdata", ByteBuffer.wrap(e.getRawdata().getBytes("UTF-8")));
_writer.write(datum, encoder);
encoder.flush();
out.close();
return out.toByteArray();
}
}
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