Refactor IndexRouting.ExtractFromSource to be an abstract class #135206
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,135 @@ | ||
| /* | ||
| * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one | ||
| * or more contributor license agreements. Licensed under the "Elastic License | ||
| * 2.0", the "GNU Affero General Public License v3.0 only", and the "Server Side | ||
| * Public License v 1"; you may not use this file except in compliance with, at | ||
| * your election, the "Elastic License 2.0", the "GNU Affero General Public | ||
| * License v3.0 only", or the "Server Side Public License, v 1". | ||
| */ | ||
|
|
||
| package org.elasticsearch.cluster.routing; | ||
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|
||
| import org.apache.lucene.util.BytesRef; | ||
| import org.elasticsearch.common.ParsingException; | ||
| import org.elasticsearch.common.Strings; | ||
| import org.elasticsearch.common.util.ByteUtils; | ||
| import org.elasticsearch.core.Nullable; | ||
| import org.elasticsearch.index.IndexVersions; | ||
| import org.elasticsearch.xcontent.XContentParser; | ||
| import org.elasticsearch.xcontent.XContentString; | ||
|
|
||
| import java.io.IOException; | ||
| import java.util.ArrayList; | ||
| import java.util.Collections; | ||
| import java.util.List; | ||
| import java.util.function.IntSupplier; | ||
| import java.util.function.Predicate; | ||
|
|
||
| import static org.elasticsearch.common.xcontent.XContentParserUtils.ensureExpectedToken; | ||
| import static org.elasticsearch.common.xcontent.XContentParserUtils.expectValueToken; | ||
|
|
||
| /** | ||
| * A builder for computing a hash from fields in the document source that are part of the | ||
| * {@link org.elasticsearch.cluster.metadata.IndexMetadata#INDEX_ROUTING_PATH}. | ||
| * It is used in the context of {@link IndexRouting.ExtractFromSource.ForRoutingPath} to determine the shard a document should be routed to. | ||
| */ | ||
| public class RoutingHashBuilder { | ||
| private final List<NameAndHash> hashes = new ArrayList<>(); | ||
| private final Predicate<String> isRoutingPath; | ||
|
|
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| public RoutingHashBuilder(Predicate<String> isRoutingPath) { | ||
| this.isRoutingPath = isRoutingPath; | ||
| } | ||
|
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| public void addMatching(String fieldName, BytesRef string) { | ||
| if (isRoutingPath.test(fieldName)) { | ||
| addHash(fieldName, string); | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Only expected to be called for old indices created before | ||
| * {@link IndexVersions#TIME_SERIES_ROUTING_HASH_IN_ID} while creating (during ingestion) | ||
| * or synthesizing (at query time) the _id field. | ||
| */ | ||
| public String createId(byte[] suffix, IntSupplier onEmpty) { | ||
| byte[] idBytes = new byte[4 + suffix.length]; | ||
| ByteUtils.writeIntLE(buildHash(onEmpty), idBytes, 0); | ||
| System.arraycopy(suffix, 0, idBytes, 4, suffix.length); | ||
| return Strings.BASE_64_NO_PADDING_URL_ENCODER.encodeToString(idBytes); | ||
| } | ||
|
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| void extractObject(@Nullable String path, XContentParser source) throws IOException { | ||
| while (source.currentToken() != XContentParser.Token.END_OBJECT) { | ||
| ensureExpectedToken(XContentParser.Token.FIELD_NAME, source.currentToken(), source); | ||
| String fieldName = source.currentName(); | ||
| String subPath = path == null ? fieldName : path + "." + fieldName; | ||
| source.nextToken(); | ||
| extractItem(subPath, source); | ||
| } | ||
| } | ||
|
|
||
| private void extractArray(@Nullable String path, XContentParser source) throws IOException { | ||
| while (source.currentToken() != XContentParser.Token.END_ARRAY) { | ||
| expectValueToken(source.currentToken(), source); | ||
| extractItem(path, source); | ||
| } | ||
| } | ||
|
|
||
| private void extractItem(String path, XContentParser source) throws IOException { | ||
| switch (source.currentToken()) { | ||
| case START_OBJECT: | ||
| source.nextToken(); | ||
| extractObject(path, source); | ||
| source.nextToken(); | ||
| break; | ||
| case VALUE_STRING: | ||
| case VALUE_NUMBER: | ||
| case VALUE_BOOLEAN: | ||
| XContentString.UTF8Bytes utf8Bytes = source.optimizedText().bytes(); | ||
| addHash(path, new BytesRef(utf8Bytes.bytes(), utf8Bytes.offset(), utf8Bytes.length())); | ||
| source.nextToken(); | ||
| break; | ||
| case START_ARRAY: | ||
| source.nextToken(); | ||
| extractArray(path, source); | ||
| source.nextToken(); | ||
| break; | ||
| case VALUE_NULL: | ||
| source.nextToken(); | ||
| break; | ||
| default: | ||
| throw new ParsingException( | ||
| source.getTokenLocation(), | ||
| "Cannot extract routing path due to unexpected token [{}]", | ||
| source.currentToken() | ||
| ); | ||
| } | ||
| } | ||
|
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| private void addHash(String path, BytesRef value) { | ||
| hashes.add(new NameAndHash(new BytesRef(path), IndexRouting.ExtractFromSource.hash(value), hashes.size())); | ||
| } | ||
|
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| int buildHash(IntSupplier onEmpty) { | ||
| if (hashes.isEmpty()) { | ||
| return onEmpty.getAsInt(); | ||
| } | ||
| Collections.sort(hashes); | ||
| int hash = 0; | ||
| for (NameAndHash nah : hashes) { | ||
| hash = 31 * hash + (IndexRouting.ExtractFromSource.hash(nah.name) ^ nah.hash); | ||
| } | ||
| return hash; | ||
| } | ||
|
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| private record NameAndHash(BytesRef name, int hash, int order) implements Comparable<NameAndHash> { | ||
| @Override | ||
| public int compareTo(NameAndHash o) { | ||
| int i = name.compareTo(o.name); | ||
| if (i != 0) return i; | ||
| // ensures array values are in the order as they appear in the source | ||
| return Integer.compare(order, o.order); | ||
| } | ||
| } | ||
| } |
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