[GitHub] MikeThomsen commented on a change in pull request #3268: NIFI-5947 Elasticsearch lookup service compatible with LookupAttribute

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MikeThomsen commented on a change in pull request #3268: NIFI-5947 Elasticsearch lookup service compatible with LookupAttribute
URL: https://github.com/apache/nifi/pull/3268#discussion_r247724378
 
 

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 File path: nifi-nar-bundles/nifi-elasticsearch-bundle/nifi-elasticsearch-client-service/src/main/java/org/apache/nifi/elasticsearch/ElasticSearchStringLookupService.java
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+/*
+ * 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.nifi.elasticsearch;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.apache.nifi.annotation.lifecycle.OnEnabled;
+import org.apache.nifi.components.PropertyDescriptor;
+import org.apache.nifi.controller.AbstractControllerService;
+import org.apache.nifi.controller.ConfigurationContext;
+import org.apache.nifi.expression.ExpressionLanguageScope;
+import org.apache.nifi.lookup.LookupFailureException;
+import org.apache.nifi.lookup.StringLookupService;
+import org.apache.nifi.processor.util.StandardValidators;
+
+import java.io.IOException;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.Set;
+
+public class ElasticSearchStringLookupService extends AbstractControllerService implements StringLookupService {
+    public static final PropertyDescriptor CLIENT_SERVICE = new PropertyDescriptor.Builder()
+            .name("el-rest-client-service")
+            .displayName("Client Service")
+            .description("An ElasticSearch client service to use for running queries.")
+            .identifiesControllerService(ElasticSearchClientService.class)
+            .required(true)
+            .build();
+    public static final PropertyDescriptor INDEX = new PropertyDescriptor.Builder()
+            .name("el-lookup-index")
+            .displayName("Index")
+            .description("The name of the index to read from")
+            .required(true)
+            .expressionLanguageSupported(ExpressionLanguageScope.VARIABLE_REGISTRY)
+            .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+            .build();
+    public static final PropertyDescriptor TYPE = new PropertyDescriptor.Builder()
+            .name("el-lookup-type")
+            .displayName("Type")
+            .description("The type of this document (used by Elasticsearch for indexing and searching)")
+            .required(false)
+            .expressionLanguageSupported(ExpressionLanguageScope.VARIABLE_REGISTRY)
+            .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+            .build();
+    private static final List<PropertyDescriptor> DESCRIPTORS = Arrays.asList(CLIENT_SERVICE, INDEX, TYPE);
+    private static final ObjectMapper mapper = new ObjectMapper();
+    private static final String ID = "id";
+    private ElasticSearchClientService esClient;
+    private String index;
+    private String type;
+
+    @Override
+    protected List<PropertyDescriptor> getSupportedPropertyDescriptors() {
+        return DESCRIPTORS;
+    }
+
+    @OnEnabled
+    public void onEnabled(final ConfigurationContext context) {
+        esClient = context.getProperty(CLIENT_SERVICE).asControllerService(ElasticSearchClientService.class);
+        index = context.getProperty(INDEX).evaluateAttributeExpressions().getValue();
+        type = context.getProperty(TYPE).evaluateAttributeExpressions().getValue();
+    }
+
+    @Override
+    public Optional<String> lookup(Map<String, Object> coordinates) throws LookupFailureException {
+        try {
+            final String id = (String) coordinates.get(ID);
+            final Map<String, Object> enums = esClient.get(index, type, id);
 
 Review comment:
   How do you envision users figuring out which document they need for the enrichment?

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