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FlumeAvroEventBuilder.java
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FlumeAvroEventBuilder.java
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/*
* Copyright 2014-2016 CyberVision, Inc.
*
* 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.
*/
package org.kaaproject.kaa.server.appenders.flume.appender;
import org.apache.avro.generic.GenericDatumWriter;
import org.apache.avro.io.BinaryEncoder;
import org.apache.avro.io.EncoderFactory;
import org.apache.flume.Event;
import org.apache.flume.event.EventBuilder;
import org.kaaproject.kaa.server.appenders.flume.config.gen.FlumeConfig;
import org.kaaproject.kaa.server.appenders.flume.config.gen.FlumeEventFormat;
import org.kaaproject.kaa.server.common.log.shared.appender.LogEvent;
import org.kaaproject.kaa.server.common.log.shared.appender.LogSchema;
import org.kaaproject.kaa.server.common.log.shared.appender.data.ProfileInfo;
import org.kaaproject.kaa.server.common.log.shared.avro.gen.RecordData;
import org.kaaproject.kaa.server.common.log.shared.avro.gen.RecordHeader;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
public class FlumeAvroEventBuilder extends FlumeEventBuilder {
private static final Logger LOG = LoggerFactory.getLogger(FlumeAvroEventBuilder.class);
private static final String AVRO_SCHEMA_HEADER_LITERAL = "flume.avro.schema.literal";
private static final String CLIENT_PROFILE_NOT_SET = "Client profile is not set!";
private static final String SERVER_PROFILE_NOT_SET = "Server profile is not set!";
private FlumeEventFormat flumeEventFormat;
private boolean includeClientProfile;
private boolean includeServerProfile;
@Override
public void init(FlumeConfig configuration) {
flumeEventFormat = configuration.getFlumeEventFormat();
includeClientProfile = configuration.getIncludeClientProfile();
includeServerProfile = configuration.getIncludeServerProfile();
}
@Override
public List<Event> generateEvents(String appToken, LogSchema schema, List<LogEvent> logEvents,
ProfileInfo clientProfile, ProfileInfo serverProfile,
RecordHeader header) {
LOG.debug("Build flume events with appToken [{}], schema version [{}], events: [{}]"
+ " and header [{}].", appToken, schema.getVersion(), logEvents, header);
List<Event> events = null;
switch (flumeEventFormat) {
case RECORDS_CONTAINER:
Event event = generateRecordsContainerEvent(appToken, schema, logEvents, clientProfile,
serverProfile, header);
if (event != null) {
events = Collections.singletonList(event);
}
break;
case GENERIC:
events = generateGenericEvent(schema, logEvents);
break;
default:
break;
}
return events;
}
private Event generateRecordsContainerEvent(String appToken, LogSchema schema,
List<LogEvent> logEvents, ProfileInfo clientProfile,
ProfileInfo serverProfile, RecordHeader header) {
if (clientProfile == null && includeClientProfile) {
LOG.error("Can't generate records container event. " + CLIENT_PROFILE_NOT_SET);
throw new RuntimeException(CLIENT_PROFILE_NOT_SET);
}
if (serverProfile == null && includeServerProfile) {
LOG.error("Can't generate records container event. " + SERVER_PROFILE_NOT_SET);
throw new RuntimeException(SERVER_PROFILE_NOT_SET);
}
Event event = null;
RecordData logData = new RecordData();
logData.setSchemaVersion(schema.getVersion());
logData.setApplicationToken(appToken);
logData.setRecordHeader(header);
if (includeClientProfile) {
if (clientProfile != null) {
logData.setClientProfileBody(clientProfile.getBody());
logData.setClientSchemaId(clientProfile.getSchemaId());
}
}
if (includeServerProfile) {
if (serverProfile != null) {
logData.setServerProfileBody(serverProfile.getBody());
logData.setServerSchemaId(serverProfile.getSchemaId());
}
}
List<ByteBuffer> bytes = new ArrayList<>(logEvents.size());
for (LogEvent logEvent : logEvents) {
bytes.add(ByteBuffer.wrap(logEvent.getLogData()));
}
logData.setEventRecords(bytes);
EncoderFactory factory = EncoderFactory.get();
GenericDatumWriter<RecordData> writer = new GenericDatumWriter<>(logData.getSchema());
LOG.debug("Convert load data [{}] to bytes.", logData);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
factory.binaryEncoder(baos, null);
BinaryEncoder encoder = factory.binaryEncoder(baos, null);
try {
writer.write(logData, encoder);
encoder.flush();
event = EventBuilder.withBody(baos.toByteArray());
} catch (IOException ex) {
LOG.warn("Can't convert avro object {} to binary. Exception catched: {}", logData, ex);
}
LOG.trace("Build flume event with array body [{}]", baos);
return event;
}
private List<Event> generateGenericEvent(LogSchema schema, List<LogEvent> logEvents) {
List<Event> events = new ArrayList<>();
for (LogEvent logEvent : logEvents) {
Event event = EventBuilder.withBody(logEvent.getLogData());
event.getHeaders().put(AVRO_SCHEMA_HEADER_LITERAL, schema.getSchema());
events.add(event);
}
return events;
}
}