Github user mattyb149 commented on a diff in the pull request: https://github.com/apache/nifi/pull/733#discussion_r80112353 --- Diff: nifi-nar-bundles/nifi-elasticsearch-bundle/nifi-elasticsearch-processors/src/main/java/org/apache/nifi/processors/elasticsearch/ScrollElasticsearchHttp.java --- @@ -0,0 +1,415 @@ +/* + * 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.processors.elasticsearch; + +import java.io.IOException; +import java.net.MalformedURLException; +import java.net.URL; +import java.util.ArrayList; +import java.util.Collections; +import java.util.HashMap; +import java.util.HashSet; +import java.util.List; +import java.util.Map; +import java.util.Set; +import java.util.concurrent.TimeUnit; +import java.util.regex.Pattern; +import java.util.stream.Collectors; +import java.util.stream.Stream; + +import org.apache.commons.lang3.StringUtils; +import org.apache.nifi.annotation.behavior.EventDriven; +import org.apache.nifi.annotation.behavior.InputRequirement; +import org.apache.nifi.annotation.behavior.Stateful; +import org.apache.nifi.annotation.behavior.SupportsBatching; +import org.apache.nifi.annotation.behavior.WritesAttribute; +import org.apache.nifi.annotation.behavior.WritesAttributes; +import org.apache.nifi.annotation.documentation.CapabilityDescription; +import org.apache.nifi.annotation.documentation.Tags; +import org.apache.nifi.annotation.lifecycle.OnScheduled; +import org.apache.nifi.components.PropertyDescriptor; +import org.apache.nifi.components.state.Scope; +import org.apache.nifi.components.state.StateManager; +import org.apache.nifi.components.state.StateMap; +import org.apache.nifi.flowfile.FlowFile; +import org.apache.nifi.logging.ComponentLog; +import org.apache.nifi.processor.ProcessContext; +import org.apache.nifi.processor.ProcessSession; +import org.apache.nifi.processor.Relationship; +import org.apache.nifi.processor.exception.ProcessException; +import org.apache.nifi.processor.util.StandardValidators; +import org.apache.nifi.stream.io.ByteArrayInputStream; +import org.codehaus.jackson.JsonNode; + +import okhttp3.HttpUrl; +import okhttp3.OkHttpClient; +import okhttp3.Response; +import okhttp3.ResponseBody; + +@InputRequirement(InputRequirement.Requirement.INPUT_FORBIDDEN) +@EventDriven +@SupportsBatching +@Tags({ "elasticsearch", "query", "scroll", "read", "get", "http" }) +@CapabilityDescription("Scrolls through an Elasticsearch query using the specified connection properties. " + + "This processor is intended to be run on the primary node, and is designed for scrolling through " + + "huge result sets, as in the case of a reindex. The state must be cleared before another query " + + "can be run. Each page of results is returned, wrapped in a JSON object like so: { \"hits\" : [ <doc1>, <doc2>, <docn> ] }. " + + "Note that the full body of each page of documents will be read into memory before being " + + "written to a Flow File for transfer.") +@WritesAttributes({ + @WritesAttribute(attribute = "es.index", description = "The Elasticsearch index containing the document"), + @WritesAttribute(attribute = "es.type", description = "The Elasticsearch document type") }) +@Stateful(description = "After each successful scroll page, the latest scroll_id is persisted in scrollId as input for the next scroll call. " + + "Once the entire query is complete, finishedQuery state will be set to true, and the processor will not execute unless this is cleared.", scopes = { Scope.LOCAL }) +public class ScrollElasticsearchHttp extends AbstractElasticsearchHttpProcessor { + + private static final String FINISHED_QUERY_STATE = "finishedQuery"; + private static final String SCROLL_ID_STATE = "scrollId"; + private static final String FIELD_INCLUDE_QUERY_PARAM = "_source_include"; + private static final String QUERY_QUERY_PARAM = "q"; + private static final String SORT_QUERY_PARAM = "sort"; + private static final String SCROLL_QUERY_PARAM = "scroll"; + private static final String SCROLL_ID_QUERY_PARAM = "scroll_id"; + private static final String SIZE_QUERY_PARAM = "size"; + + public static final Relationship REL_SUCCESS = new Relationship.Builder() + .name("success") + .description( + "All FlowFiles that are read from Elasticsearch are routed to this relationship.") + .build(); + + public static final Relationship REL_FAILURE = new Relationship.Builder() + .name("failure") + .description( + "All FlowFiles that cannot be read from Elasticsearch are routed to this relationship. Note that only incoming " + + "flow files will be routed to failure.").build(); + + public static final PropertyDescriptor QUERY = new PropertyDescriptor.Builder() + .name("scroll-es-query").displayName("Query") + .description("The Lucene-style query to run against ElasticSearch").required(true) + .expressionLanguageSupported(true).addValidator(StandardValidators.NON_EMPTY_VALIDATOR) + .build(); + + public static final PropertyDescriptor SCROLL_DURATION = new PropertyDescriptor.Builder() + .name("scroll-es-scroll") + .displayName("Scroll Duration") + .description("The scroll duration is how long each search context is kept in memory.") + .defaultValue("1m") + .required(true) + .expressionLanguageSupported(true) + .addValidator( + StandardValidators.createRegexMatchingValidator(Pattern.compile("[0-9]+(m|h)"))) + .build(); + + public static final PropertyDescriptor INDEX = new PropertyDescriptor.Builder() + .name("scroll-es-index").displayName("Index") + .description("The name of the index to read from").required(true) + .expressionLanguageSupported(true).addValidator(StandardValidators.NON_EMPTY_VALIDATOR) + .build(); + + public static final PropertyDescriptor TYPE = new PropertyDescriptor.Builder() + .name("scroll-es-type") + .displayName("Type") + .description( + "The (optional) type of this document, used by Elasticsearch for indexing and searching. If the property is empty or set " + + "to _all, the first document matching the identifier across all types will be retrieved.") + .required(false).expressionLanguageSupported(true) + .addValidator(StandardValidators.NON_EMPTY_VALIDATOR).build(); + + public static final PropertyDescriptor FIELDS = new PropertyDescriptor.Builder() + .name("scroll-es-fields") + .displayName("Fields") + .description( + "A comma-separated list of fields to retrieve from the document. If the Fields property is left blank, " + + "then the entire document's source will be retrieved.") + .required(false).expressionLanguageSupported(true) + .addValidator(StandardValidators.NON_EMPTY_VALIDATOR).build(); + + public static final PropertyDescriptor SORT = new PropertyDescriptor.Builder() + .name("scroll-es-sort") + .displayName("Sort") + .description( + "A sort parameter (e.g., timestamp:asc). If the Sort property is left blank, " + + "then the results will be retrieved in document order.") + .required(false).expressionLanguageSupported(true) + .addValidator(StandardValidators.NON_EMPTY_VALIDATOR).build(); + + public static final PropertyDescriptor PAGE_SIZE = new PropertyDescriptor.Builder() + .name("scroll-es-size").displayName("Page Size").defaultValue("20") + .description("Determines how many documents to return per page during scrolling.") + .required(true).expressionLanguageSupported(true) + .addValidator(StandardValidators.POSITIVE_INTEGER_VALIDATOR).build(); + + @Override + public Set<Relationship> getRelationships() { + final Set<Relationship> relationships = new HashSet<>(); + relationships.add(REL_SUCCESS); + relationships.add(REL_FAILURE); + return Collections.unmodifiableSet(relationships); + } + + @Override + public final List<PropertyDescriptor> getSupportedPropertyDescriptors() { + final List<PropertyDescriptor> descriptors = new ArrayList<>(); + descriptors.add(ES_URL); + descriptors.add(PROP_SSL_CONTEXT_SERVICE); + descriptors.add(USERNAME); + descriptors.add(PASSWORD); + descriptors.add(CONNECT_TIMEOUT); + descriptors.add(RESPONSE_TIMEOUT); + descriptors.add(QUERY); + descriptors.add(SCROLL_DURATION); + descriptors.add(PAGE_SIZE); + descriptors.add(INDEX); + descriptors.add(TYPE); + descriptors.add(FIELDS); + descriptors.add(SORT); + + return Collections.unmodifiableList(descriptors); + } + + @OnScheduled + public void setup(ProcessContext context) { + super.setup(context); + } + + @Override + public void onTrigger(final ProcessContext context, final ProcessSession session) + throws ProcessException { + + try { + if (isQueryFinished(context.getStateManager())) { + getLogger().trace( + "Query has been marked finished in the state manager. " + + "To run another query, clear the state."); + return; + } + } catch (IOException e) { + throw new ProcessException("Could not retrieve state", e); + } + + OkHttpClient okHttpClient = getClient(); + + FlowFile flowFile = session.create(); + + final String index = context.getProperty(INDEX).evaluateAttributeExpressions(flowFile) + .getValue(); + final String query = context.getProperty(QUERY).evaluateAttributeExpressions(flowFile) + .getValue(); + final String docType = context.getProperty(TYPE).evaluateAttributeExpressions(flowFile) + .getValue(); + final int pageSize = context.getProperty(PAGE_SIZE).evaluateAttributeExpressions(flowFile) + .asInteger().intValue(); + final String fields = context.getProperty(FIELDS).isSet() ? context.getProperty(FIELDS) + .evaluateAttributeExpressions(flowFile).getValue() : null; + final String sort = context.getProperty(SORT).isSet() ? context.getProperty(SORT) + .evaluateAttributeExpressions(flowFile).getValue() : null; + final String scroll = context.getProperty(SCROLL_DURATION).isSet() ? context + .getProperty(SCROLL_DURATION).evaluateAttributeExpressions(flowFile).getValue() : null; + + // Authentication + final String username = context.getProperty(USERNAME).getValue(); + final String password = context.getProperty(PASSWORD).getValue(); + + final ComponentLog logger = getLogger(); + + try { + String scrollId = loadScrollId(context.getStateManager()); + + if (scrollId != null) { + // read the url property from the context + final String urlstr = StringUtils.trimToEmpty(context.getProperty(ES_URL) + .getValue()); + final URL scrollurl = buildRequestURL(urlstr, query, index, docType, fields, sort, + scrollId, pageSize, scroll); + final long startNanos = System.nanoTime(); + + final Response getResponse = sendRequestToElasticsearch(okHttpClient, scrollurl, + username, password, "GET", null); + this.getPage(getResponse, scrollurl, context, session, flowFile, logger, startNanos); + } else { + logger.debug("Querying {}/{} from Elasticsearch: {}", new Object[] { index, + docType, query }); + + // read the url property from the context + final String urlstr = StringUtils.trimToEmpty(context.getProperty(ES_URL) + .getValue()); + final URL queryUrl = buildRequestURL(urlstr, query, index, docType, fields, sort, + scrollId, pageSize, scroll); + final long startNanos = System.nanoTime(); + + final Response getResponse = sendRequestToElasticsearch(okHttpClient, queryUrl, + username, password, "GET", null); + this.getPage(getResponse, queryUrl, context, session, flowFile, logger, startNanos); + } + + } catch (IOException ioe) { + logger.error( + "Failed to read from Elasticsearch due to {}, this may indicate an error in configuration " + + "(hosts, username/password, etc.).", + new Object[] { ioe.getLocalizedMessage() }, ioe); + session.remove(flowFile); + context.yield(); + + } catch (Exception e) { + logger.error("Failed to read {} from Elasticsearch due to {}", new Object[] { flowFile, + e.getLocalizedMessage() }, e); + session.transfer(flowFile, REL_FAILURE); + context.yield(); + } + } + + private void getPage(final Response getResponse, final URL url, final ProcessContext context, + final ProcessSession session, FlowFile flowFile, final ComponentLog logger, final long startNanos) + throws IOException { + final int statusCode = getResponse.code(); + + if (isSuccess(statusCode)) { + ResponseBody body = getResponse.body(); + final byte[] bodyBytes = body.bytes(); + JsonNode responseJson = parseJsonResponse(new ByteArrayInputStream(bodyBytes)); + String scrollId = responseJson.get("_scroll_id").asText(); + + StringBuilder builder = new StringBuilder(); + + builder.append("{ \"hits\" : ["); + + JsonNode hits = responseJson.get("hits").get("hits"); + if (hits.size() == 0) { + finishQuery(context.getStateManager()); + session.remove(flowFile); + return; + } + + for(int i = 0; i < hits.size(); i++) { + JsonNode hit = hits.get(i); + String retrievedIndex = hit.get("_index").asText(); + String retrievedType = hit.get("_type").asText(); + + JsonNode source = hit.get("_source"); + flowFile = session.putAttribute(flowFile, "es.index", retrievedIndex); --- End diff -- ah good point. Ok looks good will comment on the whole PR
--- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. ---