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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.action.admin.indices.mapping.get;
import org.elasticsearch.ElasticsearchException;
import org.elasticsearch.action.admin.indices.mapping.get.GetFieldMappingsResponse.FieldMappingMetaData;
import org.elasticsearch.action.support.ActionFilters;
import org.elasticsearch.action.support.single.shard.TransportSingleShardAction;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.block.ClusterBlockException;
import org.elasticsearch.cluster.block.ClusterBlockLevel;
import org.elasticsearch.cluster.metadata.IndexNameExpressionResolver;
import org.elasticsearch.cluster.routing.ShardsIterator;
import org.elasticsearch.cluster.service.ClusterService;
import org.elasticsearch.common.collect.MapBuilder;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.regex.Regex;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.xcontent.ToXContent;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentFactory;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.index.IndexService;
import org.elasticsearch.index.mapper.DocumentFieldMappers;
import org.elasticsearch.index.mapper.DocumentMapper;
import org.elasticsearch.index.mapper.FieldMapper;
import org.elasticsearch.index.shard.ShardId;
import org.elasticsearch.indices.IndicesService;
import org.elasticsearch.indices.TypeMissingException;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.TransportService;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.Map;
import java.util.stream.Collectors;
import static java.util.Collections.singletonMap;
import static org.elasticsearch.common.util.CollectionUtils.newLinkedList;
/**
* Transport action used to retrieve the mappings related to fields that belong to a specific index
*/
public class TransportGetFieldMappingsIndexAction extends TransportSingleShardAction<GetFieldMappingsIndexRequest, GetFieldMappingsResponse> {
private static final String ACTION_NAME = GetFieldMappingsAction.NAME + "[index]";
protected final ClusterService clusterService;
private final IndicesService indicesService;
@Inject
public TransportGetFieldMappingsIndexAction(Settings settings, ClusterService clusterService, TransportService transportService,
IndicesService indicesService, ThreadPool threadPool, ActionFilters actionFilters,
IndexNameExpressionResolver indexNameExpressionResolver) {
super(settings, ACTION_NAME, threadPool, clusterService, transportService, actionFilters, indexNameExpressionResolver, GetFieldMappingsIndexRequest::new, ThreadPool.Names.MANAGEMENT);
this.clusterService = clusterService;
this.indicesService = indicesService;
}
@Override
protected boolean resolveIndex(GetFieldMappingsIndexRequest request) {
//internal action, index already resolved
return false;
}
@Override
protected ShardsIterator shards(ClusterState state, InternalRequest request) {
// Will balance requests between shards
return state.routingTable().index(request.concreteIndex()).randomAllActiveShardsIt();
}
@Override
protected GetFieldMappingsResponse shardOperation(final GetFieldMappingsIndexRequest request, ShardId shardId) {
assert shardId != null;
IndexService indexService = indicesService.indexServiceSafe(shardId.getIndex());
Collection<String> typeIntersection;
if (request.types().length == 0) {
typeIntersection = indexService.mapperService().types();
} else {
typeIntersection = indexService.mapperService().types()
.stream()
.filter(type -> Regex.simpleMatch(request.types(), type))
.collect(Collectors.toCollection(ArrayList::new));
if (typeIntersection.isEmpty()) {
throw new TypeMissingException(shardId.getIndex(), request.types());
}
}
MapBuilder<String, Map<String, FieldMappingMetaData>> typeMappings = new MapBuilder<>();
for (String type : typeIntersection) {
DocumentMapper documentMapper = indexService.mapperService().documentMapper(type);
Map<String, FieldMappingMetaData> fieldMapping = findFieldMappingsByType(documentMapper, request);
if (!fieldMapping.isEmpty()) {
typeMappings.put(type, fieldMapping);
}
}
return new GetFieldMappingsResponse(singletonMap(shardId.getIndexName(), typeMappings.immutableMap()));
}
@Override
protected GetFieldMappingsResponse newResponse() {
return new GetFieldMappingsResponse();
}
@Override
protected ClusterBlockException checkRequestBlock(ClusterState state, InternalRequest request) {
return state.blocks().indexBlockedException(ClusterBlockLevel.METADATA_READ, request.concreteIndex());
}
private static final ToXContent.Params includeDefaultsParams = new ToXContent.Params() {
static final String INCLUDE_DEFAULTS = "include_defaults";
@Override
public String param(String key) {
if (INCLUDE_DEFAULTS.equals(key)) {
return "true";
}
return null;
}
@Override
public String param(String key, String defaultValue) {
if (INCLUDE_DEFAULTS.equals(key)) {
return "true";
}
return defaultValue;
}
@Override
public boolean paramAsBoolean(String key, boolean defaultValue) {
if (INCLUDE_DEFAULTS.equals(key)) {
return true;
}
return defaultValue;
}
@Override
public Boolean paramAsBoolean(String key, Boolean defaultValue) {
if (INCLUDE_DEFAULTS.equals(key)) {
return true;
}
return defaultValue;
}
};
private Map<String, FieldMappingMetaData> findFieldMappingsByType(DocumentMapper documentMapper, GetFieldMappingsIndexRequest request) {
MapBuilder<String, FieldMappingMetaData> fieldMappings = new MapBuilder<>();
final DocumentFieldMappers allFieldMappers = documentMapper.mappers();
for (String field : request.fields()) {
if (Regex.isMatchAllPattern(field)) {
for (FieldMapper fieldMapper : allFieldMappers) {
addFieldMapper(fieldMapper.fieldType().name(), fieldMapper, fieldMappings, request.includeDefaults());
}
} else if (Regex.isSimpleMatchPattern(field)) {
// go through the field mappers 3 times, to make sure we give preference to the resolve order: full name, index name, name.
// also make sure we only store each mapper once.
Collection<FieldMapper> remainingFieldMappers = newLinkedList(allFieldMappers);
for (Iterator<FieldMapper> it = remainingFieldMappers.iterator(); it.hasNext(); ) {
final FieldMapper fieldMapper = it.next();
if (Regex.simpleMatch(field, fieldMapper.fieldType().name())) {
addFieldMapper(fieldMapper.fieldType().name(), fieldMapper, fieldMappings, request.includeDefaults());
it.remove();
}
}
for (Iterator<FieldMapper> it = remainingFieldMappers.iterator(); it.hasNext(); ) {
final FieldMapper fieldMapper = it.next();
if (Regex.simpleMatch(field, fieldMapper.fieldType().name())) {
addFieldMapper(fieldMapper.fieldType().name(), fieldMapper, fieldMappings, request.includeDefaults());
it.remove();
}
}
} else {
// not a pattern
FieldMapper fieldMapper = allFieldMappers.smartNameFieldMapper(field);
if (fieldMapper != null) {
addFieldMapper(field, fieldMapper, fieldMappings, request.includeDefaults());
} else if (request.probablySingleFieldRequest()) {
fieldMappings.put(field, FieldMappingMetaData.NULL);
}
}
}
return fieldMappings.immutableMap();
}
private void addFieldMapper(String field, FieldMapper fieldMapper, MapBuilder<String, FieldMappingMetaData> fieldMappings, boolean includeDefaults) {
if (fieldMappings.containsKey(field)) {
return;
}
try {
XContentBuilder builder = XContentFactory.contentBuilder(XContentType.JSON);
builder.startObject();
fieldMapper.toXContent(builder, includeDefaults ? includeDefaultsParams : ToXContent.EMPTY_PARAMS);
builder.endObject();
fieldMappings.put(field, new FieldMappingMetaData(fieldMapper.fieldType().name(), builder.bytes()));
} catch (IOException e) {
throw new ElasticsearchException("failed to serialize XContent of field [" + field + "]", e);
}
}
}
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