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OpenSearch subproject :server
/*
* SPDX-License-Identifier: Apache-2.0
*
* The OpenSearch Contributors require contributions made to
* this file be licensed under the Apache-2.0 license or a
* compatible open source license.
*/
/*
* 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.
*/
/*
* Modifications Copyright OpenSearch Contributors. See
* GitHub history for details.
*/
package org.opensearch.action.get;
import org.opensearch.OpenSearchException;
import org.opensearch.Version;
import org.opensearch.common.annotation.PublicApi;
import org.opensearch.core.ParseField;
import org.opensearch.core.action.ActionResponse;
import org.opensearch.core.common.io.stream.StreamInput;
import org.opensearch.core.common.io.stream.StreamOutput;
import org.opensearch.core.common.io.stream.Writeable;
import org.opensearch.core.xcontent.ToXContentObject;
import org.opensearch.core.xcontent.XContentBuilder;
import org.opensearch.core.xcontent.XContentParser;
import org.opensearch.core.xcontent.XContentParser.Token;
import org.opensearch.index.get.GetResult;
import org.opensearch.index.mapper.MapperService;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
/**
* Transport response for a multi get.
*
* @opensearch.api
*/
@PublicApi(since = "1.0.0")
public class MultiGetResponse extends ActionResponse implements Iterable, ToXContentObject {
private static final ParseField INDEX = new ParseField("_index");
private static final ParseField ID = new ParseField("_id");
private static final ParseField ERROR = new ParseField("error");
private static final ParseField DOCS = new ParseField("docs");
// In mixed clusters, the 1.x cluster could still return the '_type' in the response payload, it has to
// be handled gracefully
@Deprecated(forRemoval = true)
private static final ParseField TYPE = new ParseField("_type");
/**
* Represents a failure.
*
* @opensearch.api
*/
@PublicApi(since = "1.0.0")
public static class Failure implements Writeable, ToXContentObject {
private final String index;
private final String id;
private final Exception exception;
public Failure(String index, String id, Exception exception) {
this.index = index;
this.id = id;
this.exception = exception;
}
Failure(StreamInput in) throws IOException {
index = in.readString();
if (in.getVersion().before(Version.V_2_0_0)) {
in.readOptionalString();
}
id = in.readString();
exception = in.readException();
}
/**
* The index name of the action.
*/
public String getIndex() {
return this.index;
}
/**
* The id of the action.
*/
public String getId() {
return id;
}
/**
* The failure message.
*/
public String getMessage() {
return exception != null ? exception.getMessage() : null;
}
@Override
public void writeTo(StreamOutput out) throws IOException {
out.writeString(index);
if (out.getVersion().before(Version.V_2_0_0)) {
out.writeOptionalString(MapperService.SINGLE_MAPPING_NAME);
}
out.writeString(id);
out.writeException(exception);
}
@Override
public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
builder.startObject();
builder.field(INDEX.getPreferredName(), index);
builder.field(ID.getPreferredName(), id);
OpenSearchException.generateFailureXContent(builder, params, exception, true);
builder.endObject();
return builder;
}
public Exception getFailure() {
return exception;
}
}
private final MultiGetItemResponse[] responses;
public MultiGetResponse(MultiGetItemResponse[] responses) {
this.responses = responses;
}
MultiGetResponse(StreamInput in) throws IOException {
super(in);
responses = in.readArray(MultiGetItemResponse::new, MultiGetItemResponse[]::new);
}
public MultiGetItemResponse[] getResponses() {
return this.responses;
}
@Override
public Iterator iterator() {
return Arrays.stream(responses).iterator();
}
@Override
public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
builder.startObject();
builder.startArray(DOCS.getPreferredName());
for (MultiGetItemResponse response : responses) {
if (response.isFailed()) {
Failure failure = response.getFailure();
failure.toXContent(builder, params);
} else {
GetResponse getResponse = response.getResponse();
getResponse.toXContent(builder, params);
}
}
builder.endArray();
builder.endObject();
return builder;
}
public static MultiGetResponse fromXContent(XContentParser parser) throws IOException {
String currentFieldName = null;
List items = new ArrayList<>();
for (Token token = parser.nextToken(); token != Token.END_OBJECT; token = parser.nextToken()) {
switch (token) {
case FIELD_NAME:
currentFieldName = parser.currentName();
break;
case START_ARRAY:
if (DOCS.getPreferredName().equals(currentFieldName)) {
for (token = parser.nextToken(); token != Token.END_ARRAY; token = parser.nextToken()) {
if (token == Token.START_OBJECT) {
items.add(parseItem(parser));
}
}
}
break;
default:
// If unknown tokens are encounter then these should be ignored, because
// this is parsing logic on the client side.
break;
}
}
return new MultiGetResponse(items.toArray(new MultiGetItemResponse[0]));
}
private static MultiGetItemResponse parseItem(XContentParser parser) throws IOException {
String currentFieldName = null;
String index = null;
String id = null;
OpenSearchException exception = null;
GetResult getResult = null;
for (Token token = parser.nextToken(); token != Token.END_OBJECT; token = parser.nextToken()) {
switch (token) {
case FIELD_NAME:
currentFieldName = parser.currentName();
if (INDEX.match(currentFieldName, parser.getDeprecationHandler()) == false
&& ID.match(currentFieldName, parser.getDeprecationHandler()) == false
&& TYPE.match(currentFieldName, parser.getDeprecationHandler()) == false
&& ERROR.match(currentFieldName, parser.getDeprecationHandler()) == false) {
getResult = GetResult.fromXContentEmbedded(parser, index, id);
}
break;
case VALUE_STRING:
if (INDEX.match(currentFieldName, parser.getDeprecationHandler())) {
index = parser.text();
} else if (ID.match(currentFieldName, parser.getDeprecationHandler())) {
id = parser.text();
}
break;
case START_OBJECT:
if (ERROR.match(currentFieldName, parser.getDeprecationHandler())) {
exception = OpenSearchException.fromXContent(parser);
}
break;
default:
// If unknown tokens are encounter then these should be ignored, because
// this is parsing logic on the client side.
break;
}
if (getResult != null) {
break;
}
}
if (exception != null) {
return new MultiGetItemResponse(null, new Failure(index, id, exception));
} else {
GetResponse getResponse = new GetResponse(getResult);
return new MultiGetItemResponse(getResponse, null);
}
}
@Override
public void writeTo(StreamOutput out) throws IOException {
out.writeArray(responses);
}
}