org.elasticsearch.action.fieldcaps.TransportFieldCapabilitiesAction Maven / Gradle / Ivy
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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.fieldcaps;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.OriginalIndices;
import org.elasticsearch.action.support.ActionFilters;
import org.elasticsearch.action.support.HandledTransportAction;
import org.elasticsearch.client.Client;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.metadata.IndexNameExpressionResolver;
import org.elasticsearch.cluster.service.ClusterService;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.util.concurrent.CountDown;
import org.elasticsearch.tasks.Task;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.RemoteClusterAware;
import org.elasticsearch.transport.RemoteClusterService;
import org.elasticsearch.transport.TransportService;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
public class TransportFieldCapabilitiesAction extends HandledTransportAction {
private final ThreadPool threadPool;
private final ClusterService clusterService;
private final TransportFieldCapabilitiesIndexAction shardAction;
private final RemoteClusterService remoteClusterService;
private final IndexNameExpressionResolver indexNameExpressionResolver;
@Inject
public TransportFieldCapabilitiesAction(TransportService transportService,
ClusterService clusterService, ThreadPool threadPool,
TransportFieldCapabilitiesIndexAction shardAction,
ActionFilters actionFilters, IndexNameExpressionResolver indexNameExpressionResolver) {
super(FieldCapabilitiesAction.NAME, transportService, actionFilters, FieldCapabilitiesRequest::new);
this.threadPool = threadPool;
this.clusterService = clusterService;
this.remoteClusterService = transportService.getRemoteClusterService();
this.shardAction = shardAction;
this.indexNameExpressionResolver = indexNameExpressionResolver;
}
@Override
protected void doExecute(Task task, FieldCapabilitiesRequest request, final ActionListener listener) {
final ClusterState clusterState = clusterService.state();
final Map remoteClusterIndices = remoteClusterService.groupIndices(request.indicesOptions(),
request.indices(), idx -> indexNameExpressionResolver.hasIndexOrAlias(idx, clusterState));
final OriginalIndices localIndices = remoteClusterIndices.remove(RemoteClusterAware.LOCAL_CLUSTER_GROUP_KEY);
final String[] concreteIndices;
if (localIndices == null) {
// in the case we have one or more remote indices but no local we don't expand to all local indices and just do remote indices
concreteIndices = Strings.EMPTY_ARRAY;
} else {
concreteIndices = indexNameExpressionResolver.concreteIndexNames(clusterState, localIndices);
}
final String[] allIndices = mergeIndiceNames(concreteIndices, remoteClusterIndices);
final int totalNumRequest = concreteIndices.length + remoteClusterIndices.size();
final CountDown completionCounter = new CountDown(totalNumRequest);
final List indexResponses = Collections.synchronizedList(new ArrayList<>());
final Runnable onResponse = () -> {
if (completionCounter.countDown()) {
if (request.isMergeResults()) {
listener.onResponse(merge(allIndices, indexResponses, request.includeUnmapped()));
} else {
listener.onResponse(new FieldCapabilitiesResponse(indexResponses));
}
}
};
if (totalNumRequest == 0) {
listener.onResponse(new FieldCapabilitiesResponse(allIndices, Collections.emptyMap()));
} else {
ActionListener innerListener = new ActionListener() {
@Override
public void onResponse(FieldCapabilitiesIndexResponse result) {
indexResponses.add(result);
onResponse.run();
}
@Override
public void onFailure(Exception e) {
// TODO we should somehow inform the user that we failed
onResponse.run();
}
};
for (String index : concreteIndices) {
shardAction.execute(new FieldCapabilitiesIndexRequest(request.fields(), index, localIndices), innerListener);
}
// this is the cross cluster part of this API - we force the other cluster to not merge the results but instead
// send us back all individual index results.
for (Map.Entry remoteIndices : remoteClusterIndices.entrySet()) {
String clusterAlias = remoteIndices.getKey();
OriginalIndices originalIndices = remoteIndices.getValue();
Client remoteClusterClient = remoteClusterService.getRemoteClusterClient(threadPool, clusterAlias);
FieldCapabilitiesRequest remoteRequest = new FieldCapabilitiesRequest();
remoteRequest.setMergeResults(false); // we need to merge on this node
remoteRequest.indicesOptions(originalIndices.indicesOptions());
remoteRequest.indices(originalIndices.indices());
remoteRequest.fields(request.fields());
remoteClusterClient.fieldCaps(remoteRequest, ActionListener.wrap(response -> {
for (FieldCapabilitiesIndexResponse res : response.getIndexResponses()) {
indexResponses.add(new FieldCapabilitiesIndexResponse(RemoteClusterAware.
buildRemoteIndexName(clusterAlias, res.getIndexName()), res.get()));
}
onResponse.run();
}, failure -> onResponse.run()));
}
}
}
private String[] mergeIndiceNames(String[] localIndices, Map remoteIndices) {
Set allIndices = new HashSet<>();
Arrays.stream(localIndices).forEach(allIndices::add);
for (Map.Entry entry : remoteIndices.entrySet()) {
for (String index : entry.getValue().indices()) {
allIndices.add(RemoteClusterAware.buildRemoteIndexName(entry.getKey(), index));
}
}
return allIndices.stream().toArray(String[]::new);
}
private FieldCapabilitiesResponse merge(String[] indices, List indexResponses,
boolean includeUnmapped) {
final Map> responseMapBuilder = new HashMap<> ();
for (FieldCapabilitiesIndexResponse response : indexResponses) {
innerMerge(responseMapBuilder, response.getIndexName(), response.get());
}
final Map> responseMap = new HashMap<>();
for (Map.Entry> entry : responseMapBuilder.entrySet()) {
final Map typeMapBuilder = entry.getValue();
if (includeUnmapped) {
addUnmappedFields(indices, entry.getKey(), typeMapBuilder);
}
boolean multiTypes = typeMapBuilder.size() > 1;
final Map typeMap = new HashMap<>();
for (Map.Entry fieldEntry : typeMapBuilder.entrySet()) {
typeMap.put(fieldEntry.getKey(), fieldEntry.getValue().build(multiTypes));
}
responseMap.put(entry.getKey(), Collections.unmodifiableMap(typeMap));
}
return new FieldCapabilitiesResponse(indices, Collections.unmodifiableMap(responseMap));
}
private void addUnmappedFields(String[] indices, String field, Map typeMap) {
Set unmappedIndices = new HashSet<>();
Arrays.stream(indices).forEach(unmappedIndices::add);
typeMap.values().stream().forEach((b) -> b.getIndices().stream().forEach(unmappedIndices::remove));
if (unmappedIndices.isEmpty() == false) {
FieldCapabilities.Builder unmapped = new FieldCapabilities.Builder(field, "unmapped");
typeMap.put("unmapped", unmapped);
for (String index : unmappedIndices) {
unmapped.add(index, false, false, Collections.emptyMap());
}
}
}
private void innerMerge(Map> responseMapBuilder,
String indexName, Map map) {
for (Map.Entry entry : map.entrySet()) {
final String field = entry.getKey();
final FieldCapabilities fieldCap = entry.getValue();
Map typeMap = responseMapBuilder.computeIfAbsent(field, f -> new HashMap<>());
FieldCapabilities.Builder builder = typeMap.computeIfAbsent(fieldCap.getType(),
key -> new FieldCapabilities.Builder(field, key));
builder.merge(indexName, fieldCap.isSearchable(), fieldCap.isAggregatable(), fieldCap.meta());
}
}
}