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[Security Solution] Resolver children pagination (elastic#74603)
* Handle info and change events for children * Adding sequence * Fixing children pagination * Fixing tests * Adding docs
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129
...ck/plugins/security_solution/server/endpoint/routes/resolver/utils/children_pagination.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,129 @@ | ||
| /* | ||
| * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one | ||
| * or more contributor license agreements. Licensed under the Elastic License; | ||
| * you may not use this file except in compliance with the Elastic License. | ||
| */ | ||
|
|
||
| import { ResolverEvent } from '../../../../../common/endpoint/types'; | ||
| import { eventSequence } from '../../../../../common/endpoint/models/event'; | ||
| import { JsonObject } from '../../../../../../../../src/plugins/kibana_utils/common'; | ||
| import { urlEncodeCursor, SortFields, urlDecodeCursor } from './pagination'; | ||
|
|
||
| /** | ||
| * Pagination information for the children class. | ||
| */ | ||
| export interface ChildrenPaginationCursor { | ||
| timestamp: number; | ||
| sequence: number; | ||
| } | ||
|
|
||
| /** | ||
| * Interface for defining the returned pagination information. | ||
| */ | ||
| export interface ChildrenPaginationFields { | ||
| sort: SortFields; | ||
| size: number; | ||
| filters: JsonObject[]; | ||
| } | ||
|
|
||
| /** | ||
| * This class handles constructing pagination cursors that resolver can use to return additional events in subsequent | ||
| * queries. | ||
| */ | ||
| export class ChildrenPaginationBuilder { | ||
| constructor( | ||
| /** | ||
| * upper limit of how many results should be returned by the parent query. | ||
| */ | ||
| private readonly size: number, | ||
| /** | ||
| * timestamp that will be used in the search_after section | ||
| */ | ||
| private readonly timestamp?: number, | ||
| /** | ||
| * unique sequence number for the event | ||
| */ | ||
| private readonly sequence?: number | ||
| ) {} | ||
|
|
||
| /** | ||
| * This function validates that the parsed cursor is a ChildrenPaginationCursor. | ||
| * | ||
| * @param parsed an object parsed from an encoded cursor. | ||
| */ | ||
| static decode( | ||
| parsed: ChildrenPaginationCursor | undefined | ||
| ): ChildrenPaginationCursor | undefined { | ||
| if (parsed && parsed.timestamp && parsed.sequence) { | ||
| const { timestamp, sequence } = parsed; | ||
| return { timestamp, sequence }; | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Construct a cursor to use in subsequent queries. | ||
| * | ||
| * @param results the events that were returned by the ES query | ||
| */ | ||
| static buildCursor(results: ResolverEvent[]): string | null { | ||
| const lastResult = results[results.length - 1]; | ||
| const sequence = eventSequence(lastResult); | ||
| const cursor = { | ||
| timestamp: lastResult['@timestamp'], | ||
| sequence: sequence === undefined ? 0 : sequence, | ||
| }; | ||
| return urlEncodeCursor(cursor); | ||
| } | ||
|
|
||
| /** | ||
| * Creates a PaginationBuilder with an upper bound limit of results and a specific cursor to use to retrieve the next | ||
| * set of results. | ||
| * | ||
| * @param limit upper bound for the number of results to return within this query | ||
| * @param after a cursor to retrieve the next set of results | ||
| */ | ||
| static createBuilder(limit: number, after?: string): ChildrenPaginationBuilder { | ||
| if (after) { | ||
| try { | ||
| const cursor = urlDecodeCursor(after, ChildrenPaginationBuilder.decode); | ||
| if (cursor && cursor.timestamp && cursor.sequence) { | ||
| return new ChildrenPaginationBuilder(limit, cursor.timestamp, cursor.sequence); | ||
| } | ||
| } catch (err) { | ||
| /* tslint:disable:no-empty */ | ||
| } // ignore invalid cursor values | ||
| } | ||
| return new ChildrenPaginationBuilder(limit); | ||
| } | ||
|
|
||
| /** | ||
| * Helper for creates an object for adding the pagination fields to a query | ||
| * | ||
| * @param tiebreaker a unique field to use as the tiebreaker for the search_after | ||
| * @returns an object containing the pagination information | ||
| */ | ||
| buildQueryFields(tiebreaker: string): ChildrenPaginationFields { | ||
| const sort: SortFields = [{ '@timestamp': 'asc' }, { [tiebreaker]: 'asc' }]; | ||
| const filters: JsonObject[] = []; | ||
| if (this.timestamp && this.sequence) { | ||
| filters.push( | ||
| { | ||
| range: { | ||
| '@timestamp': { | ||
| gte: this.timestamp, | ||
| }, | ||
| }, | ||
| }, | ||
| { | ||
| range: { | ||
| 'event.sequence': { | ||
| gt: this.sequence, | ||
| }, | ||
| }, | ||
| } | ||
| ); | ||
| } | ||
|
|
||
| return { sort, size: this.size, filters }; | ||
| } | ||
| } |
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