| /** |
| * 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.metron.elasticsearch.writer; |
| |
| import org.apache.metron.common.Constants; |
| import org.apache.metron.common.configuration.writer.WriterConfiguration; |
| import org.apache.metron.common.field.FieldNameConverter; |
| import org.apache.metron.common.field.FieldNameConverters; |
| import org.apache.metron.common.writer.BulkMessageWriter; |
| import org.apache.metron.common.writer.BulkMessage; |
| import org.apache.metron.common.writer.BulkWriterResponse; |
| import org.apache.metron.elasticsearch.bulk.BulkDocumentWriter; |
| import org.apache.metron.elasticsearch.bulk.ElasticsearchBulkDocumentWriter; |
| import org.apache.metron.elasticsearch.bulk.WriteFailure; |
| import org.apache.metron.elasticsearch.bulk.WriteSuccess; |
| import org.apache.metron.elasticsearch.bulk.BulkDocumentWriterResults; |
| import org.apache.metron.elasticsearch.client.ElasticsearchClient; |
| import org.apache.metron.elasticsearch.client.ElasticsearchClientFactory; |
| import org.apache.metron.elasticsearch.utils.ElasticsearchUtils; |
| import org.apache.metron.stellar.common.utils.ConversionUtils; |
| import org.json.simple.JSONObject; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.Serializable; |
| import java.lang.invoke.MethodHandles; |
| import java.text.SimpleDateFormat; |
| import java.util.Date; |
| import java.util.List; |
| import java.util.Map; |
| |
| import static java.lang.String.format; |
| import static org.apache.metron.stellar.common.Constants.Fields.TIMESTAMP; |
| |
| /** |
| * A {@link BulkMessageWriter} that writes messages to Elasticsearch. |
| */ |
| public class ElasticsearchWriter implements BulkMessageWriter<JSONObject>, Serializable { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass()); |
| |
| /** |
| * The Elasticsearch client. |
| */ |
| private transient ElasticsearchClient client; |
| |
| /** |
| * Responsible for writing documents. |
| * |
| * <p>Uses a {@link MessageIdBasedDocument} to maintain the relationship between |
| * a {@link org.apache.metron.common.writer.MessageId} and the document created from the contents of that message. If |
| * a document cannot be written, the associated message needs to be reported as a failure. |
| */ |
| private transient BulkDocumentWriter<MessageIdBasedDocument> documentWriter; |
| |
| /** |
| * A simple data formatter used to build the appropriate Elasticsearch index name. |
| */ |
| private SimpleDateFormat dateFormat; |
| |
| @Override |
| public void init(Map stormConf, WriterConfiguration configurations) { |
| Map<String, Object> globalConfiguration = configurations.getGlobalConfig(); |
| dateFormat = ElasticsearchUtils.getIndexFormat(globalConfiguration); |
| |
| // only create the document writer, if one does not already exist. useful for testing. |
| if(documentWriter == null) { |
| client = ElasticsearchClientFactory.create(globalConfiguration); |
| documentWriter = new ElasticsearchBulkDocumentWriter<>(client); |
| } |
| } |
| |
| @Override |
| public BulkWriterResponse write(String sensorType, |
| WriterConfiguration configurations, |
| List<BulkMessage<JSONObject>> messages) { |
| |
| // fetch the field name converter for this sensor type |
| FieldNameConverter fieldNameConverter = FieldNameConverters.create(sensorType, configurations); |
| String indexPostfix = dateFormat.format(new Date()); |
| String indexName = ElasticsearchUtils.getIndexName(sensorType, indexPostfix, configurations); |
| |
| // create a document from each message |
| for(BulkMessage<JSONObject> bulkWriterMessage: messages) { |
| MessageIdBasedDocument document = createDocument(bulkWriterMessage, sensorType, fieldNameConverter, configurations.isSetDocumentId(sensorType)); |
| documentWriter.addDocument(document, indexName); |
| } |
| |
| // write the documents |
| BulkDocumentWriterResults<MessageIdBasedDocument> results = documentWriter.write(); |
| |
| // build the response |
| BulkWriterResponse response = new BulkWriterResponse(); |
| for(WriteSuccess<MessageIdBasedDocument> success: results.getSuccesses()) { |
| response.addSuccess(success.getDocument().getMessageId()); |
| } |
| for(WriteFailure<MessageIdBasedDocument> failure: results.getFailures()) { |
| response.addError(failure.getCause(), failure.getDocument().getMessageId()); |
| } |
| return response; |
| } |
| |
| private MessageIdBasedDocument createDocument(BulkMessage<JSONObject> bulkWriterMessage, |
| String sensorType, |
| FieldNameConverter fieldNameConverter, |
| boolean setDocumentId) { |
| // transform the message fields to the source fields of the indexed document |
| JSONObject source = new JSONObject(); |
| JSONObject message = bulkWriterMessage.getMessage(); |
| for(Object k : message.keySet()){ |
| copyField(k.toString(), message, source, fieldNameConverter); |
| } |
| |
| // define the document id |
| String guid = ConversionUtils.convert(source.get(Constants.GUID), String.class); |
| if(guid == null) { |
| LOG.warn("Missing '{}' field; document ID will be auto-generated.", Constants.GUID); |
| } |
| |
| // define the document timestamp |
| Long timestamp = null; |
| Object value = source.get(TIMESTAMP.getName()); |
| if(value != null) { |
| timestamp = Long.parseLong(value.toString()); |
| } else { |
| LOG.warn("Missing '{}' field; timestamp will be set to system time.", TIMESTAMP.getName()); |
| } |
| MessageIdBasedDocument messageIdBasedDocument = new MessageIdBasedDocument(source, guid, sensorType, timestamp, bulkWriterMessage.getId()); |
| if (setDocumentId) { |
| // Use the metron-generated GUID instead of letting Elasticsearch set the id |
| messageIdBasedDocument.setDocumentID(guid); |
| } |
| return messageIdBasedDocument; |
| } |
| |
| @Override |
| public String getName() { |
| return "elasticsearch"; |
| } |
| |
| @Override |
| public void close() throws Exception { |
| if(client != null) { |
| client.close(); |
| } |
| } |
| |
| /** |
| * Copies the value of a field from the source message to the destination message. |
| * |
| * <p>A field name may also be transformed in the destination message by the {@link FieldNameConverter}. |
| * |
| * @param sourceFieldName The name of the field to copy from the source message |
| * @param source The source message. |
| * @param destination The destination message. |
| * @param fieldNameConverter The field name converter that transforms the field name |
| * between the source and destination. |
| */ |
| //JSONObject doesn't expose map generics |
| @SuppressWarnings("unchecked") |
| private void copyField( |
| String sourceFieldName, |
| JSONObject source, |
| JSONObject destination, |
| FieldNameConverter fieldNameConverter) { |
| |
| // allow the field name to be transformed |
| String destinationFieldName = fieldNameConverter.convert(sourceFieldName); |
| |
| // copy the field |
| destination.put(destinationFieldName, source.get(sourceFieldName)); |
| } |
| |
| /** |
| * Set the document writer. Primarily used for testing. |
| * @param documentWriter The {@link BulkDocumentWriter} to use. |
| */ |
| public void setDocumentWriter(BulkDocumentWriter<MessageIdBasedDocument> documentWriter) { |
| this.documentWriter = documentWriter; |
| } |
| } |
| |