58 lines
1.7 KiB
TypeScript
58 lines
1.7 KiB
TypeScript
import type { Document } from '../bson';
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import type { Collection } from '../collection';
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import type { Server } from '../sdam/server';
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import type { ClientSession } from '../sessions';
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import type { Callback } from '../utils';
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import { AggregateOperation, AggregateOptions } from './aggregate';
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/** @public */
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export interface CountDocumentsOptions extends AggregateOptions {
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/** The number of documents to skip. */
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skip?: number;
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/** The maximum amounts to count before aborting. */
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limit?: number;
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}
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/** @internal */
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export class CountDocumentsOperation extends AggregateOperation<number> {
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constructor(collection: Collection, query: Document, options: CountDocumentsOptions) {
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const pipeline = [];
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pipeline.push({ $match: query });
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if (typeof options.skip === 'number') {
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pipeline.push({ $skip: options.skip });
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}
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if (typeof options.limit === 'number') {
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pipeline.push({ $limit: options.limit });
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}
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pipeline.push({ $group: { _id: 1, n: { $sum: 1 } } });
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super(collection.s.namespace, pipeline, options);
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}
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override execute(
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server: Server,
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session: ClientSession | undefined,
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callback: Callback<number>
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): void {
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super.execute(server, session, (err, result) => {
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if (err || !result) {
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callback(err);
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return;
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}
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// NOTE: We're avoiding creating a cursor here to reduce the callstack.
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const response = result as unknown as Document;
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if (response.cursor == null || response.cursor.firstBatch == null) {
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callback(undefined, 0);
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return;
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}
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const docs = response.cursor.firstBatch;
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callback(undefined, docs.length ? docs[0].n : 0);
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});
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}
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}
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