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672 lines
25 KiB
672 lines
25 KiB
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.assertUninitialized = exports.next = exports.AbstractCursor = exports.CURSOR_FLAGS = void 0;
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const stream_1 = require("stream");
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const util_1 = require("util");
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const bson_1 = require("../bson");
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const error_1 = require("../error");
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const mongo_types_1 = require("../mongo_types");
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const execute_operation_1 = require("../operations/execute_operation");
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const get_more_1 = require("../operations/get_more");
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const kill_cursors_1 = require("../operations/kill_cursors");
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const read_concern_1 = require("../read_concern");
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const read_preference_1 = require("../read_preference");
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const sessions_1 = require("../sessions");
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const utils_1 = require("../utils");
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/** @internal */
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const kId = Symbol('id');
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/** @internal */
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const kDocuments = Symbol('documents');
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/** @internal */
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const kServer = Symbol('server');
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/** @internal */
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const kNamespace = Symbol('namespace');
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/** @internal */
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const kClient = Symbol('client');
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/** @internal */
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const kSession = Symbol('session');
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/** @internal */
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const kOptions = Symbol('options');
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/** @internal */
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const kTransform = Symbol('transform');
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/** @internal */
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const kInitialized = Symbol('initialized');
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/** @internal */
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const kClosed = Symbol('closed');
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/** @internal */
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const kKilled = Symbol('killed');
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/** @internal */
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const kInit = Symbol('kInit');
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/** @public */
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exports.CURSOR_FLAGS = [
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'tailable',
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'oplogReplay',
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'noCursorTimeout',
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'awaitData',
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'exhaust',
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'partial'
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];
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/** @public */
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class AbstractCursor extends mongo_types_1.TypedEventEmitter {
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/** @internal */
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constructor(client, namespace, options = {}) {
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super();
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if (!client.s.isMongoClient) {
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throw new error_1.MongoRuntimeError('Cursor must be constructed with MongoClient');
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}
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this[kClient] = client;
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this[kNamespace] = namespace;
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this[kId] = null;
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this[kDocuments] = new utils_1.List();
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this[kInitialized] = false;
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this[kClosed] = false;
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this[kKilled] = false;
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this[kOptions] = {
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readPreference: options.readPreference && options.readPreference instanceof read_preference_1.ReadPreference
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? options.readPreference
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: read_preference_1.ReadPreference.primary,
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...(0, bson_1.pluckBSONSerializeOptions)(options)
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};
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const readConcern = read_concern_1.ReadConcern.fromOptions(options);
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if (readConcern) {
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this[kOptions].readConcern = readConcern;
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}
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if (typeof options.batchSize === 'number') {
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this[kOptions].batchSize = options.batchSize;
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}
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// we check for undefined specifically here to allow falsy values
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// eslint-disable-next-line no-restricted-syntax
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if (options.comment !== undefined) {
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this[kOptions].comment = options.comment;
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}
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if (typeof options.maxTimeMS === 'number') {
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this[kOptions].maxTimeMS = options.maxTimeMS;
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}
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if (typeof options.maxAwaitTimeMS === 'number') {
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this[kOptions].maxAwaitTimeMS = options.maxAwaitTimeMS;
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}
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if (options.session instanceof sessions_1.ClientSession) {
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this[kSession] = options.session;
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}
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else {
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this[kSession] = this[kClient].startSession({ owner: this, explicit: false });
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}
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}
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get id() {
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return this[kId] ?? undefined;
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}
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/** @internal */
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get client() {
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return this[kClient];
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}
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/** @internal */
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get server() {
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return this[kServer];
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}
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get namespace() {
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return this[kNamespace];
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}
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get readPreference() {
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return this[kOptions].readPreference;
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}
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get readConcern() {
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return this[kOptions].readConcern;
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}
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/** @internal */
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get session() {
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return this[kSession];
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}
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set session(clientSession) {
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this[kSession] = clientSession;
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}
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/** @internal */
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get cursorOptions() {
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return this[kOptions];
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}
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get closed() {
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return this[kClosed];
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}
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get killed() {
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return this[kKilled];
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}
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get loadBalanced() {
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return !!this[kClient].topology?.loadBalanced;
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}
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/** Returns current buffered documents length */
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bufferedCount() {
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return this[kDocuments].length;
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}
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/** Returns current buffered documents */
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readBufferedDocuments(number) {
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const bufferedDocs = [];
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const documentsToRead = Math.min(number ?? this[kDocuments].length, this[kDocuments].length);
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for (let count = 0; count < documentsToRead; count++) {
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const document = this[kDocuments].shift();
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if (document != null) {
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bufferedDocs.push(document);
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}
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}
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return bufferedDocs;
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}
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async *[Symbol.asyncIterator]() {
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if (this.closed) {
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return;
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}
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try {
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while (true) {
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const document = await this.next();
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// Intentional strict null check, because users can map cursors to falsey values.
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// We allow mapping to all values except for null.
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// eslint-disable-next-line no-restricted-syntax
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if (document === null) {
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if (!this.closed) {
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const message = 'Cursor returned a `null` document, but the cursor is not exhausted. Mapping documents to `null` is not supported in the cursor transform.';
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await cleanupCursorAsync(this, { needsToEmitClosed: true }).catch(() => null);
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throw new error_1.MongoAPIError(message);
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}
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break;
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}
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yield document;
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if (this[kId] === bson_1.Long.ZERO) {
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// Cursor exhausted
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break;
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}
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}
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}
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finally {
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// Only close the cursor if it has not already been closed. This finally clause handles
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// the case when a user would break out of a for await of loop early.
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if (!this.closed) {
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await this.close().catch(() => null);
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}
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}
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}
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stream(options) {
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if (options?.transform) {
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const transform = options.transform;
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const readable = new ReadableCursorStream(this);
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return readable.pipe(new stream_1.Transform({
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objectMode: true,
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highWaterMark: 1,
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transform(chunk, _, callback) {
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try {
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const transformed = transform(chunk);
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callback(undefined, transformed);
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}
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catch (err) {
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callback(err);
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}
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}
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}));
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}
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return new ReadableCursorStream(this);
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}
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async hasNext() {
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if (this[kId] === bson_1.Long.ZERO) {
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return false;
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}
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if (this[kDocuments].length !== 0) {
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return true;
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}
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const doc = await nextAsync(this, true);
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if (doc) {
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this[kDocuments].unshift(doc);
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return true;
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}
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return false;
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}
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/** Get the next available document from the cursor, returns null if no more documents are available. */
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async next() {
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if (this[kId] === bson_1.Long.ZERO) {
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throw new error_1.MongoCursorExhaustedError();
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}
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return nextAsync(this, true);
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}
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/**
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* Try to get the next available document from the cursor or `null` if an empty batch is returned
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*/
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async tryNext() {
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if (this[kId] === bson_1.Long.ZERO) {
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throw new error_1.MongoCursorExhaustedError();
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}
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return nextAsync(this, false);
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}
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/**
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* Iterates over all the documents for this cursor using the iterator, callback pattern.
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*
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* If the iterator returns `false`, iteration will stop.
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*
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* @param iterator - The iteration callback.
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*/
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async forEach(iterator) {
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if (typeof iterator !== 'function') {
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throw new error_1.MongoInvalidArgumentError('Argument "iterator" must be a function');
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}
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for await (const document of this) {
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const result = iterator(document);
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if (result === false) {
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break;
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}
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}
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}
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async close() {
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const needsToEmitClosed = !this[kClosed];
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this[kClosed] = true;
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await cleanupCursorAsync(this, { needsToEmitClosed });
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}
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/**
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* Returns an array of documents. The caller is responsible for making sure that there
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* is enough memory to store the results. Note that the array only contains partial
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* results when this cursor had been previously accessed. In that case,
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* cursor.rewind() can be used to reset the cursor.
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*/
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async toArray() {
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const array = [];
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for await (const document of this) {
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array.push(document);
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}
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return array;
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}
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/**
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* Add a cursor flag to the cursor
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*
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* @param flag - The flag to set, must be one of following ['tailable', 'oplogReplay', 'noCursorTimeout', 'awaitData', 'partial' -.
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* @param value - The flag boolean value.
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*/
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addCursorFlag(flag, value) {
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assertUninitialized(this);
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if (!exports.CURSOR_FLAGS.includes(flag)) {
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throw new error_1.MongoInvalidArgumentError(`Flag ${flag} is not one of ${exports.CURSOR_FLAGS}`);
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}
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if (typeof value !== 'boolean') {
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throw new error_1.MongoInvalidArgumentError(`Flag ${flag} must be a boolean value`);
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}
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this[kOptions][flag] = value;
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return this;
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}
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/**
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* Map all documents using the provided function
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* If there is a transform set on the cursor, that will be called first and the result passed to
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* this function's transform.
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*
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* @remarks
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*
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* **Note** Cursors use `null` internally to indicate that there are no more documents in the cursor. Providing a mapping
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* function that maps values to `null` will result in the cursor closing itself before it has finished iterating
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* all documents. This will **not** result in a memory leak, just surprising behavior. For example:
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*
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* ```typescript
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* const cursor = collection.find({});
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* cursor.map(() => null);
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*
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* const documents = await cursor.toArray();
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* // documents is always [], regardless of how many documents are in the collection.
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* ```
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*
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* Other falsey values are allowed:
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*
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* ```typescript
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* const cursor = collection.find({});
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* cursor.map(() => '');
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*
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* const documents = await cursor.toArray();
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* // documents is now an array of empty strings
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* ```
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*
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* **Note for Typescript Users:** adding a transform changes the return type of the iteration of this cursor,
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* it **does not** return a new instance of a cursor. This means when calling map,
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* you should always assign the result to a new variable in order to get a correctly typed cursor variable.
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* Take note of the following example:
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*
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* @example
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* ```typescript
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* const cursor: FindCursor<Document> = coll.find();
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* const mappedCursor: FindCursor<number> = cursor.map(doc => Object.keys(doc).length);
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* const keyCounts: number[] = await mappedCursor.toArray(); // cursor.toArray() still returns Document[]
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* ```
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* @param transform - The mapping transformation method.
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*/
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map(transform) {
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assertUninitialized(this);
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const oldTransform = this[kTransform]; // TODO(NODE-3283): Improve transform typing
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if (oldTransform) {
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this[kTransform] = doc => {
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return transform(oldTransform(doc));
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};
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}
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else {
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this[kTransform] = transform;
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}
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return this;
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}
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/**
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* Set the ReadPreference for the cursor.
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*
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* @param readPreference - The new read preference for the cursor.
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*/
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withReadPreference(readPreference) {
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assertUninitialized(this);
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if (readPreference instanceof read_preference_1.ReadPreference) {
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this[kOptions].readPreference = readPreference;
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}
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else if (typeof readPreference === 'string') {
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this[kOptions].readPreference = read_preference_1.ReadPreference.fromString(readPreference);
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}
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else {
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throw new error_1.MongoInvalidArgumentError(`Invalid read preference: ${readPreference}`);
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}
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return this;
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}
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/**
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* Set the ReadPreference for the cursor.
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*
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* @param readPreference - The new read preference for the cursor.
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*/
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withReadConcern(readConcern) {
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assertUninitialized(this);
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const resolvedReadConcern = read_concern_1.ReadConcern.fromOptions({ readConcern });
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if (resolvedReadConcern) {
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this[kOptions].readConcern = resolvedReadConcern;
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}
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return this;
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}
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/**
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* Set a maxTimeMS on the cursor query, allowing for hard timeout limits on queries (Only supported on MongoDB 2.6 or higher)
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*
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* @param value - Number of milliseconds to wait before aborting the query.
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*/
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maxTimeMS(value) {
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assertUninitialized(this);
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if (typeof value !== 'number') {
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throw new error_1.MongoInvalidArgumentError('Argument for maxTimeMS must be a number');
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}
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this[kOptions].maxTimeMS = value;
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return this;
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}
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/**
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* Set the batch size for the cursor.
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*
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* @param value - The number of documents to return per batch. See {@link https://docs.mongodb.com/manual/reference/command/find/|find command documentation}.
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*/
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batchSize(value) {
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assertUninitialized(this);
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if (this[kOptions].tailable) {
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throw new error_1.MongoTailableCursorError('Tailable cursor does not support batchSize');
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}
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if (typeof value !== 'number') {
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throw new error_1.MongoInvalidArgumentError('Operation "batchSize" requires an integer');
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}
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this[kOptions].batchSize = value;
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return this;
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}
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/**
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* Rewind this cursor to its uninitialized state. Any options that are present on the cursor will
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* remain in effect. Iterating this cursor will cause new queries to be sent to the server, even
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* if the resultant data has already been retrieved by this cursor.
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*/
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rewind() {
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if (!this[kInitialized]) {
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return;
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}
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this[kId] = null;
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this[kDocuments].clear();
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this[kClosed] = false;
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this[kKilled] = false;
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this[kInitialized] = false;
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const session = this[kSession];
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if (session) {
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// We only want to end this session if we created it, and it hasn't ended yet
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if (session.explicit === false) {
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if (!session.hasEnded) {
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session.endSession().catch(() => null);
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}
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this[kSession] = this.client.startSession({ owner: this, explicit: false });
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}
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}
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}
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/** @internal */
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_getMore(batchSize, callback) {
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// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
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const getMoreOperation = new get_more_1.GetMoreOperation(this[kNamespace], this[kId], this[kServer], {
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...this[kOptions],
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session: this[kSession],
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batchSize
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});
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(0, execute_operation_1.executeOperation)(this[kClient], getMoreOperation, callback);
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}
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/**
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* @internal
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*
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* This function is exposed for the unified test runner's createChangeStream
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* operation. We cannot refactor to use the abstract _initialize method without
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* a significant refactor.
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*/
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[kInit](callback) {
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this._initialize(this[kSession], (error, state) => {
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if (state) {
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const response = state.response;
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this[kServer] = state.server;
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if (response.cursor) {
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// TODO(NODE-2674): Preserve int64 sent from MongoDB
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this[kId] =
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typeof response.cursor.id === 'number'
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? bson_1.Long.fromNumber(response.cursor.id)
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: response.cursor.id;
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if (response.cursor.ns) {
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this[kNamespace] = (0, utils_1.ns)(response.cursor.ns);
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}
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this[kDocuments].pushMany(response.cursor.firstBatch);
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}
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// When server responses return without a cursor document, we close this cursor
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// and return the raw server response. This is often the case for explain commands
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// for example
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if (this[kId] == null) {
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this[kId] = bson_1.Long.ZERO;
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// TODO(NODE-3286): ExecutionResult needs to accept a generic parameter
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this[kDocuments].push(state.response);
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}
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}
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// the cursor is now initialized, even if an error occurred or it is dead
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this[kInitialized] = true;
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if (error) {
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return cleanupCursor(this, { error }, () => callback(error, undefined));
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}
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if (cursorIsDead(this)) {
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return cleanupCursor(this, undefined, () => callback());
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}
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callback();
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});
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}
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}
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exports.AbstractCursor = AbstractCursor;
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/** @event */
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AbstractCursor.CLOSE = 'close';
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function nextDocument(cursor) {
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const doc = cursor[kDocuments].shift();
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if (doc && cursor[kTransform]) {
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return cursor[kTransform](doc);
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}
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return doc;
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}
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const nextAsync = (0, util_1.promisify)(next);
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/**
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* @param cursor - the cursor on which to call `next`
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* @param blocking - a boolean indicating whether or not the cursor should `block` until data
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* is available. Generally, this flag is set to `false` because if the getMore returns no documents,
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* the cursor has been exhausted. In certain scenarios (ChangeStreams, tailable await cursors and
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* `tryNext`, for example) blocking is necessary because a getMore returning no documents does
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* not indicate the end of the cursor.
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* @param callback - callback to return the result to the caller
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* @returns
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*/
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function next(cursor, blocking, callback) {
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const cursorId = cursor[kId];
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if (cursor.closed) {
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return callback(undefined, null);
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}
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if (cursor[kDocuments].length !== 0) {
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callback(undefined, nextDocument(cursor));
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return;
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}
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if (cursorId == null) {
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// All cursors must operate within a session, one must be made implicitly if not explicitly provided
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cursor[kInit](err => {
|
|
if (err)
|
|
return callback(err);
|
|
return next(cursor, blocking, callback);
|
|
});
|
|
return;
|
|
}
|
|
if (cursorIsDead(cursor)) {
|
|
return cleanupCursor(cursor, undefined, () => callback(undefined, null));
|
|
}
|
|
// otherwise need to call getMore
|
|
const batchSize = cursor[kOptions].batchSize || 1000;
|
|
cursor._getMore(batchSize, (error, response) => {
|
|
if (response) {
|
|
const cursorId = typeof response.cursor.id === 'number'
|
|
? bson_1.Long.fromNumber(response.cursor.id)
|
|
: response.cursor.id;
|
|
cursor[kDocuments].pushMany(response.cursor.nextBatch);
|
|
cursor[kId] = cursorId;
|
|
}
|
|
if (error || cursorIsDead(cursor)) {
|
|
return cleanupCursor(cursor, { error }, () => callback(error, nextDocument(cursor)));
|
|
}
|
|
if (cursor[kDocuments].length === 0 && blocking === false) {
|
|
return callback(undefined, null);
|
|
}
|
|
next(cursor, blocking, callback);
|
|
});
|
|
}
|
|
exports.next = next;
|
|
function cursorIsDead(cursor) {
|
|
const cursorId = cursor[kId];
|
|
return !!cursorId && cursorId.isZero();
|
|
}
|
|
const cleanupCursorAsync = (0, util_1.promisify)(cleanupCursor);
|
|
function cleanupCursor(cursor, options, callback) {
|
|
const cursorId = cursor[kId];
|
|
const cursorNs = cursor[kNamespace];
|
|
const server = cursor[kServer];
|
|
const session = cursor[kSession];
|
|
const error = options?.error;
|
|
const needsToEmitClosed = options?.needsToEmitClosed ?? cursor[kDocuments].length === 0;
|
|
if (error) {
|
|
if (cursor.loadBalanced && error instanceof error_1.MongoNetworkError) {
|
|
return completeCleanup();
|
|
}
|
|
}
|
|
if (cursorId == null || server == null || cursorId.isZero() || cursorNs == null) {
|
|
if (needsToEmitClosed) {
|
|
cursor[kClosed] = true;
|
|
cursor[kId] = bson_1.Long.ZERO;
|
|
cursor.emit(AbstractCursor.CLOSE);
|
|
}
|
|
if (session) {
|
|
if (session.owner === cursor) {
|
|
session.endSession({ error }).finally(() => {
|
|
callback();
|
|
});
|
|
return;
|
|
}
|
|
if (!session.inTransaction()) {
|
|
(0, sessions_1.maybeClearPinnedConnection)(session, { error });
|
|
}
|
|
}
|
|
return callback();
|
|
}
|
|
function completeCleanup() {
|
|
if (session) {
|
|
if (session.owner === cursor) {
|
|
session.endSession({ error }).finally(() => {
|
|
cursor.emit(AbstractCursor.CLOSE);
|
|
callback();
|
|
});
|
|
return;
|
|
}
|
|
if (!session.inTransaction()) {
|
|
(0, sessions_1.maybeClearPinnedConnection)(session, { error });
|
|
}
|
|
}
|
|
cursor.emit(AbstractCursor.CLOSE);
|
|
return callback();
|
|
}
|
|
cursor[kKilled] = true;
|
|
(0, execute_operation_1.executeOperation)(cursor[kClient], new kill_cursors_1.KillCursorsOperation(cursorId, cursorNs, server, { session })).finally(() => {
|
|
completeCleanup();
|
|
});
|
|
return;
|
|
}
|
|
/** @internal */
|
|
function assertUninitialized(cursor) {
|
|
if (cursor[kInitialized]) {
|
|
throw new error_1.MongoCursorInUseError();
|
|
}
|
|
}
|
|
exports.assertUninitialized = assertUninitialized;
|
|
class ReadableCursorStream extends stream_1.Readable {
|
|
constructor(cursor) {
|
|
super({
|
|
objectMode: true,
|
|
autoDestroy: false,
|
|
highWaterMark: 1
|
|
});
|
|
this._readInProgress = false;
|
|
this._cursor = cursor;
|
|
}
|
|
// eslint-disable-next-line @typescript-eslint/no-unused-vars
|
|
_read(size) {
|
|
if (!this._readInProgress) {
|
|
this._readInProgress = true;
|
|
this._readNext();
|
|
}
|
|
}
|
|
_destroy(error, callback) {
|
|
this._cursor.close().then(() => callback(error), closeError => callback(closeError));
|
|
}
|
|
_readNext() {
|
|
next(this._cursor, true, (err, result) => {
|
|
if (err) {
|
|
// NOTE: This is questionable, but we have a test backing the behavior. It seems the
|
|
// desired behavior is that a stream ends cleanly when a user explicitly closes
|
|
// a client during iteration. Alternatively, we could do the "right" thing and
|
|
// propagate the error message by removing this special case.
|
|
if (err.message.match(/server is closed/)) {
|
|
this._cursor.close().catch(() => null);
|
|
return this.push(null);
|
|
}
|
|
// NOTE: This is also perhaps questionable. The rationale here is that these errors tend
|
|
// to be "operation was interrupted", where a cursor has been closed but there is an
|
|
// active getMore in-flight. This used to check if the cursor was killed but once
|
|
// that changed to happen in cleanup legitimate errors would not destroy the
|
|
// stream. There are change streams test specifically test these cases.
|
|
if (err.message.match(/operation was interrupted/)) {
|
|
return this.push(null);
|
|
}
|
|
// NOTE: The two above checks on the message of the error will cause a null to be pushed
|
|
// to the stream, thus closing the stream before the destroy call happens. This means
|
|
// that either of those error messages on a change stream will not get a proper
|
|
// 'error' event to be emitted (the error passed to destroy). Change stream resumability
|
|
// relies on that error event to be emitted to create its new cursor and thus was not
|
|
// working on 4.4 servers because the error emitted on failover was "interrupted at
|
|
// shutdown" while on 5.0+ it is "The server is in quiesce mode and will shut down".
|
|
// See NODE-4475.
|
|
return this.destroy(err);
|
|
}
|
|
if (result == null) {
|
|
this.push(null);
|
|
}
|
|
else if (this.destroyed) {
|
|
this._cursor.close().catch(() => null);
|
|
}
|
|
else {
|
|
if (this.push(result)) {
|
|
return this._readNext();
|
|
}
|
|
this._readInProgress = false;
|
|
}
|
|
});
|
|
}
|
|
}
|
|
//# sourceMappingURL=abstract_cursor.js.map
|