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* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.index.get;
import org.apache.lucene.index.Term;
import org.elasticsearch.ElasticsearchException;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.common.bytes.BytesReference;
import org.elasticsearch.common.collect.Tuple;
import org.elasticsearch.common.document.DocumentField;
import org.elasticsearch.common.lucene.uid.VersionsAndSeqNoResolver.DocIdAndVersion;
import org.elasticsearch.common.metrics.CounterMetric;
import org.elasticsearch.common.metrics.MeanMetric;
import org.elasticsearch.common.util.set.Sets;
import org.elasticsearch.common.xcontent.XContentFactory;
import org.elasticsearch.common.xcontent.XContentHelper;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.common.xcontent.support.XContentMapValues;
import org.elasticsearch.index.IndexSettings;
import org.elasticsearch.index.VersionType;
import org.elasticsearch.index.engine.Engine;
import org.elasticsearch.index.fieldvisitor.CustomFieldsVisitor;
import org.elasticsearch.index.fieldvisitor.FieldsVisitor;
import org.elasticsearch.index.mapper.DocumentMapper;
import org.elasticsearch.index.mapper.FieldMapper;
import org.elasticsearch.index.mapper.MapperService;
import org.elasticsearch.index.mapper.ParentFieldMapper;
import org.elasticsearch.index.mapper.SourceFieldMapper;
import org.elasticsearch.index.shard.AbstractIndexShardComponent;
import org.elasticsearch.index.shard.IndexShard;
import org.elasticsearch.search.fetch.subphase.FetchSourceContext;
import org.elasticsearch.search.fetch.subphase.ParentFieldSubFetchPhase;
import java.io.IOException;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;
public final class ShardGetService extends AbstractIndexShardComponent {
private final MapperService mapperService;
private final MeanMetric existsMetric = new MeanMetric();
private final MeanMetric missingMetric = new MeanMetric();
private final CounterMetric currentMetric = new CounterMetric();
private final IndexShard indexShard;
public ShardGetService(IndexSettings indexSettings, IndexShard indexShard,
MapperService mapperService) {
super(indexShard.shardId(), indexSettings);
this.mapperService = mapperService;
this.indexShard = indexShard;
}
public GetStats stats() {
return new GetStats(existsMetric.count(), TimeUnit.NANOSECONDS.toMillis(existsMetric.sum()), missingMetric.count(), TimeUnit.NANOSECONDS.toMillis(missingMetric.sum()), currentMetric.count());
}
public GetResult get(String type, String id, String[] gFields, boolean realtime, long version, VersionType versionType, FetchSourceContext fetchSourceContext) {
currentMetric.inc();
try {
long now = System.nanoTime();
GetResult getResult = innerGet(type, id, gFields, realtime, version, versionType, fetchSourceContext);
if (getResult.isExists()) {
existsMetric.inc(System.nanoTime() - now);
} else {
missingMetric.inc(System.nanoTime() - now);
}
return getResult;
} finally {
currentMetric.dec();
}
}
/**
* Returns {@link GetResult} based on the specified {@link org.elasticsearch.index.engine.Engine.GetResult} argument.
* This method basically loads specified fields for the associated document in the engineGetResult.
* This method load the fields from the Lucene index and not from transaction log and therefore isn't realtime.
*
* Note: Call must release engine searcher associated with engineGetResult!
*/
public GetResult get(Engine.GetResult engineGetResult, String id, String type, String[] fields, FetchSourceContext fetchSourceContext) {
if (!engineGetResult.exists()) {
return new GetResult(shardId.getIndexName(), type, id, -1, false, null, null);
}
currentMetric.inc();
try {
long now = System.nanoTime();
fetchSourceContext = normalizeFetchSourceContent(fetchSourceContext, fields);
GetResult getResult = innerGetLoadFromStoredFields(type, id, fields, fetchSourceContext, engineGetResult, mapperService);
if (getResult.isExists()) {
existsMetric.inc(System.nanoTime() - now);
} else {
missingMetric.inc(System.nanoTime() - now); // This shouldn't happen...
}
return getResult;
} finally {
currentMetric.dec();
}
}
/**
* decides what needs to be done based on the request input and always returns a valid non-null FetchSourceContext
*/
private FetchSourceContext normalizeFetchSourceContent(@Nullable FetchSourceContext context, @Nullable String[] gFields) {
if (context != null) {
return context;
}
if (gFields == null) {
return FetchSourceContext.FETCH_SOURCE;
}
for (String field : gFields) {
if (SourceFieldMapper.NAME.equals(field)) {
return FetchSourceContext.FETCH_SOURCE;
}
}
return FetchSourceContext.DO_NOT_FETCH_SOURCE;
}
private GetResult innerGet(String type, String id, String[] gFields, boolean realtime, long version, VersionType versionType, FetchSourceContext fetchSourceContext) {
fetchSourceContext = normalizeFetchSourceContent(fetchSourceContext, gFields);
final Collection types;
if (type == null || type.equals("_all")) {
types = mapperService.types();
} else {
types = Collections.singleton(type);
}
Engine.GetResult get = null;
for (String typeX : types) {
Term uidTerm = mapperService.createUidTerm(typeX, id);
if (uidTerm != null) {
get = indexShard.get(new Engine.Get(realtime, typeX, id, uidTerm)
.version(version).versionType(versionType));
if (get.exists()) {
type = typeX;
break;
} else {
get.release();
}
}
}
if (get == null || get.exists() == false) {
return new GetResult(shardId.getIndexName(), type, id, -1, false, null, null);
}
try {
// break between having loaded it from translog (so we only have _source), and having a document to load
return innerGetLoadFromStoredFields(type, id, gFields, fetchSourceContext, get, mapperService);
} finally {
get.release();
}
}
private GetResult innerGetLoadFromStoredFields(String type, String id, String[] gFields, FetchSourceContext fetchSourceContext, Engine.GetResult get, MapperService mapperService) {
Map fields = null;
BytesReference source = null;
DocIdAndVersion docIdAndVersion = get.docIdAndVersion();
FieldsVisitor fieldVisitor = buildFieldsVisitors(gFields, fetchSourceContext);
if (fieldVisitor != null) {
try {
docIdAndVersion.context.reader().document(docIdAndVersion.docId, fieldVisitor);
} catch (IOException e) {
throw new ElasticsearchException("Failed to get type [" + type + "] and id [" + id + "]", e);
}
source = fieldVisitor.source();
if (!fieldVisitor.fields().isEmpty()) {
fieldVisitor.postProcess(mapperService);
fields = new HashMap<>(fieldVisitor.fields().size());
for (Map.Entry> entry : fieldVisitor.fields().entrySet()) {
fields.put(entry.getKey(), new DocumentField(entry.getKey(), entry.getValue()));
}
}
}
DocumentMapper docMapper = mapperService.documentMapper(type);
if (docMapper.parentFieldMapper().active()) {
String parentId = ParentFieldSubFetchPhase.getParentId(docMapper.parentFieldMapper(), docIdAndVersion.context.reader(), docIdAndVersion.docId);
if (fields == null) {
fields = new HashMap<>(1);
}
fields.put(ParentFieldMapper.NAME, new DocumentField(ParentFieldMapper.NAME, Collections.singletonList(parentId)));
}
if (gFields != null && gFields.length > 0) {
for (String field : gFields) {
FieldMapper fieldMapper = docMapper.mappers().smartNameFieldMapper(field);
if (fieldMapper == null) {
if (docMapper.objectMappers().get(field) != null) {
// Only fail if we know it is a object field, missing paths / fields shouldn't fail.
throw new IllegalArgumentException("field [" + field + "] isn't a leaf field");
}
}
}
}
if (!fetchSourceContext.fetchSource()) {
source = null;
} else if (fetchSourceContext.includes().length > 0 || fetchSourceContext.excludes().length > 0) {
Map sourceAsMap;
XContentType sourceContentType = null;
// TODO: The source might parsed and available in the sourceLookup but that one uses unordered maps so different. Do we care?
Tuple> typeMapTuple = XContentHelper.convertToMap(source, true);
sourceContentType = typeMapTuple.v1();
sourceAsMap = typeMapTuple.v2();
sourceAsMap = XContentMapValues.filter(sourceAsMap, fetchSourceContext.includes(), fetchSourceContext.excludes());
try {
source = XContentFactory.contentBuilder(sourceContentType).map(sourceAsMap).bytes();
} catch (IOException e) {
throw new ElasticsearchException("Failed to get type [" + type + "] and id [" + id + "] with includes/excludes set", e);
}
}
return new GetResult(shardId.getIndexName(), type, id, get.version(), get.exists(), source, fields);
}
private static FieldsVisitor buildFieldsVisitors(String[] fields, FetchSourceContext fetchSourceContext) {
if (fields == null || fields.length == 0) {
return fetchSourceContext.fetchSource() ? new FieldsVisitor(true) : null;
}
return new CustomFieldsVisitor(Sets.newHashSet(fields), fetchSourceContext.fetchSource());
}
}