You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
701 lines
27 KiB
JavaScript
701 lines
27 KiB
JavaScript
10 months ago
|
"use strict";
|
||
|
|
Object.defineProperty(exports, "__esModule", { value: true });
|
||
|
|
exports.assertUninitialized = exports.AbstractCursor = exports.CURSOR_FLAGS = void 0;
|
||
|
|
const stream_1 = require("stream");
|
||
|
|
const bson_1 = require("../bson");
|
||
|
|
const error_1 = require("../error");
|
||
|
|
const mongo_types_1 = require("../mongo_types");
|
||
|
|
const execute_operation_1 = require("../operations/execute_operation");
|
||
|
|
const get_more_1 = require("../operations/get_more");
|
||
|
|
const kill_cursors_1 = require("../operations/kill_cursors");
|
||
|
|
const read_concern_1 = require("../read_concern");
|
||
|
|
const read_preference_1 = require("../read_preference");
|
||
|
|
const sessions_1 = require("../sessions");
|
||
|
|
const utils_1 = require("../utils");
|
||
|
|
/** @internal */
|
||
|
|
const kId = Symbol('id');
|
||
|
|
/** @internal */
|
||
|
|
const kDocuments = Symbol('documents');
|
||
|
|
/** @internal */
|
||
|
|
const kServer = Symbol('server');
|
||
|
|
/** @internal */
|
||
|
|
const kNamespace = Symbol('namespace');
|
||
|
|
/** @internal */
|
||
|
|
const kClient = Symbol('client');
|
||
|
|
/** @internal */
|
||
|
|
const kSession = Symbol('session');
|
||
|
|
/** @internal */
|
||
|
|
const kOptions = Symbol('options');
|
||
|
|
/** @internal */
|
||
|
|
const kTransform = Symbol('transform');
|
||
|
|
/** @internal */
|
||
|
|
const kInitialized = Symbol('initialized');
|
||
|
|
/** @internal */
|
||
|
|
const kClosed = Symbol('closed');
|
||
|
|
/** @internal */
|
||
|
|
const kKilled = Symbol('killed');
|
||
|
|
/** @internal */
|
||
|
|
const kInit = Symbol('kInit');
|
||
|
|
/** @public */
|
||
|
|
exports.CURSOR_FLAGS = [
|
||
|
|
'tailable',
|
||
|
|
'oplogReplay',
|
||
|
|
'noCursorTimeout',
|
||
|
|
'awaitData',
|
||
|
|
'exhaust',
|
||
|
|
'partial'
|
||
|
|
];
|
||
|
|
/** @public */
|
||
|
|
class AbstractCursor extends mongo_types_1.TypedEventEmitter {
|
||
|
|
/** @internal */
|
||
|
|
constructor(client, namespace, options = {}) {
|
||
|
|
super();
|
||
|
|
if (!client.s.isMongoClient) {
|
||
|
|
throw new error_1.MongoRuntimeError('Cursor must be constructed with MongoClient');
|
||
|
|
}
|
||
|
|
this[kClient] = client;
|
||
|
|
this[kNamespace] = namespace;
|
||
|
|
this[kId] = null;
|
||
|
|
this[kDocuments] = new utils_1.List();
|
||
|
|
this[kInitialized] = false;
|
||
|
|
this[kClosed] = false;
|
||
|
|
this[kKilled] = false;
|
||
|
|
this[kOptions] = {
|
||
|
|
readPreference: options.readPreference && options.readPreference instanceof read_preference_1.ReadPreference
|
||
|
|
? options.readPreference
|
||
|
|
: read_preference_1.ReadPreference.primary,
|
||
|
|
...(0, bson_1.pluckBSONSerializeOptions)(options)
|
||
|
|
};
|
||
|
|
const readConcern = read_concern_1.ReadConcern.fromOptions(options);
|
||
|
|
if (readConcern) {
|
||
|
|
this[kOptions].readConcern = readConcern;
|
||
|
|
}
|
||
|
|
if (typeof options.batchSize === 'number') {
|
||
|
|
this[kOptions].batchSize = options.batchSize;
|
||
|
|
}
|
||
|
|
// we check for undefined specifically here to allow falsy values
|
||
|
|
// eslint-disable-next-line no-restricted-syntax
|
||
|
|
if (options.comment !== undefined) {
|
||
|
|
this[kOptions].comment = options.comment;
|
||
|
|
}
|
||
|
|
if (typeof options.maxTimeMS === 'number') {
|
||
|
|
this[kOptions].maxTimeMS = options.maxTimeMS;
|
||
|
|
}
|
||
|
|
if (typeof options.maxAwaitTimeMS === 'number') {
|
||
|
|
this[kOptions].maxAwaitTimeMS = options.maxAwaitTimeMS;
|
||
|
|
}
|
||
|
|
if (options.session instanceof sessions_1.ClientSession) {
|
||
|
|
this[kSession] = options.session;
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
this[kSession] = this[kClient].startSession({ owner: this, explicit: false });
|
||
|
|
}
|
||
|
|
}
|
||
|
|
get id() {
|
||
|
|
return this[kId] ?? undefined;
|
||
|
|
}
|
||
|
|
/** @internal */
|
||
|
|
get isDead() {
|
||
|
|
return (this[kId]?.isZero() ?? false) || this[kClosed] || this[kKilled];
|
||
|
|
}
|
||
|
|
/** @internal */
|
||
|
|
get client() {
|
||
|
|
return this[kClient];
|
||
|
|
}
|
||
|
|
/** @internal */
|
||
|
|
get server() {
|
||
|
|
return this[kServer];
|
||
|
|
}
|
||
|
|
get namespace() {
|
||
|
|
return this[kNamespace];
|
||
|
|
}
|
||
|
|
get readPreference() {
|
||
|
|
return this[kOptions].readPreference;
|
||
|
|
}
|
||
|
|
get readConcern() {
|
||
|
|
return this[kOptions].readConcern;
|
||
|
|
}
|
||
|
|
/** @internal */
|
||
|
|
get session() {
|
||
|
|
return this[kSession];
|
||
|
|
}
|
||
|
|
set session(clientSession) {
|
||
|
|
this[kSession] = clientSession;
|
||
|
|
}
|
||
|
|
/** @internal */
|
||
|
|
get cursorOptions() {
|
||
|
|
return this[kOptions];
|
||
|
|
}
|
||
|
|
get closed() {
|
||
|
|
return this[kClosed];
|
||
|
|
}
|
||
|
|
get killed() {
|
||
|
|
return this[kKilled];
|
||
|
|
}
|
||
|
|
get loadBalanced() {
|
||
|
|
return !!this[kClient].topology?.loadBalanced;
|
||
|
|
}
|
||
|
|
/** Returns current buffered documents length */
|
||
|
|
bufferedCount() {
|
||
|
|
return this[kDocuments].length;
|
||
|
|
}
|
||
|
|
/** Returns current buffered documents */
|
||
|
|
readBufferedDocuments(number) {
|
||
|
|
const bufferedDocs = [];
|
||
|
|
const documentsToRead = Math.min(number ?? this[kDocuments].length, this[kDocuments].length);
|
||
|
|
for (let count = 0; count < documentsToRead; count++) {
|
||
|
|
const document = this[kDocuments].shift();
|
||
|
|
if (document != null) {
|
||
|
|
bufferedDocs.push(document);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return bufferedDocs;
|
||
|
|
}
|
||
|
|
async *[Symbol.asyncIterator]() {
|
||
|
|
if (this.closed) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
try {
|
||
|
|
while (true) {
|
||
|
|
const document = await this.next();
|
||
|
|
// Intentional strict null check, because users can map cursors to falsey values.
|
||
|
|
// We allow mapping to all values except for null.
|
||
|
|
// eslint-disable-next-line no-restricted-syntax
|
||
|
|
if (document === null) {
|
||
|
|
if (!this.closed) {
|
||
|
|
const message = 'Cursor returned a `null` document, but the cursor is not exhausted. Mapping documents to `null` is not supported in the cursor transform.';
|
||
|
|
await cleanupCursor(this, { needsToEmitClosed: true }).catch(() => null);
|
||
|
|
throw new error_1.MongoAPIError(message);
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
yield document;
|
||
|
|
if (this[kId] === bson_1.Long.ZERO) {
|
||
|
|
// Cursor exhausted
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
finally {
|
||
|
|
// Only close the cursor if it has not already been closed. This finally clause handles
|
||
|
|
// the case when a user would break out of a for await of loop early.
|
||
|
|
if (!this.closed) {
|
||
|
|
await this.close().catch(() => null);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
stream(options) {
|
||
|
|
if (options?.transform) {
|
||
|
|
const transform = options.transform;
|
||
|
|
const readable = new ReadableCursorStream(this);
|
||
|
|
return readable.pipe(new stream_1.Transform({
|
||
|
|
objectMode: true,
|
||
|
|
highWaterMark: 1,
|
||
|
|
transform(chunk, _, callback) {
|
||
|
|
try {
|
||
|
|
const transformed = transform(chunk);
|
||
|
|
callback(undefined, transformed);
|
||
|
|
}
|
||
|
|
catch (err) {
|
||
|
|
callback(err);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}));
|
||
|
|
}
|
||
|
|
return new ReadableCursorStream(this);
|
||
|
|
}
|
||
|
|
async hasNext() {
|
||
|
|
if (this[kId] === bson_1.Long.ZERO) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
if (this[kDocuments].length !== 0) {
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
const doc = await next(this, { blocking: true, transform: false });
|
||
|
|
if (doc) {
|
||
|
|
this[kDocuments].unshift(doc);
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
/** Get the next available document from the cursor, returns null if no more documents are available. */
|
||
|
|
async next() {
|
||
|
|
if (this[kId] === bson_1.Long.ZERO) {
|
||
|
|
throw new error_1.MongoCursorExhaustedError();
|
||
|
|
}
|
||
|
|
return next(this, { blocking: true, transform: true });
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Try to get the next available document from the cursor or `null` if an empty batch is returned
|
||
|
|
*/
|
||
|
|
async tryNext() {
|
||
|
|
if (this[kId] === bson_1.Long.ZERO) {
|
||
|
|
throw new error_1.MongoCursorExhaustedError();
|
||
|
|
}
|
||
|
|
return next(this, { blocking: false, transform: true });
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Iterates over all the documents for this cursor using the iterator, callback pattern.
|
||
|
|
*
|
||
|
|
* If the iterator returns `false`, iteration will stop.
|
||
|
|
*
|
||
|
|
* @param iterator - The iteration callback.
|
||
|
|
* @deprecated - Will be removed in a future release. Use for await...of instead.
|
||
|
|
*/
|
||
|
|
async forEach(iterator) {
|
||
|
|
if (typeof iterator !== 'function') {
|
||
|
|
throw new error_1.MongoInvalidArgumentError('Argument "iterator" must be a function');
|
||
|
|
}
|
||
|
|
for await (const document of this) {
|
||
|
|
const result = iterator(document);
|
||
|
|
if (result === false) {
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
async close() {
|
||
|
|
const needsToEmitClosed = !this[kClosed];
|
||
|
|
this[kClosed] = true;
|
||
|
|
await cleanupCursor(this, { needsToEmitClosed });
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Returns an array of documents. The caller is responsible for making sure that there
|
||
|
|
* is enough memory to store the results. Note that the array only contains partial
|
||
|
|
* results when this cursor had been previously accessed. In that case,
|
||
|
|
* cursor.rewind() can be used to reset the cursor.
|
||
|
|
*/
|
||
|
|
async toArray() {
|
||
|
|
const array = [];
|
||
|
|
for await (const document of this) {
|
||
|
|
array.push(document);
|
||
|
|
}
|
||
|
|
return array;
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Add a cursor flag to the cursor
|
||
|
|
*
|
||
|
|
* @param flag - The flag to set, must be one of following ['tailable', 'oplogReplay', 'noCursorTimeout', 'awaitData', 'partial' -.
|
||
|
|
* @param value - The flag boolean value.
|
||
|
|
*/
|
||
|
|
addCursorFlag(flag, value) {
|
||
|
|
assertUninitialized(this);
|
||
|
|
if (!exports.CURSOR_FLAGS.includes(flag)) {
|
||
|
|
throw new error_1.MongoInvalidArgumentError(`Flag ${flag} is not one of ${exports.CURSOR_FLAGS}`);
|
||
|
|
}
|
||
|
|
if (typeof value !== 'boolean') {
|
||
|
|
throw new error_1.MongoInvalidArgumentError(`Flag ${flag} must be a boolean value`);
|
||
|
|
}
|
||
|
|
this[kOptions][flag] = value;
|
||
|
|
return this;
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Map all documents using the provided function
|
||
|
|
* If there is a transform set on the cursor, that will be called first and the result passed to
|
||
|
|
* this function's transform.
|
||
|
|
*
|
||
|
|
* @remarks
|
||
|
|
*
|
||
|
|
* **Note** Cursors use `null` internally to indicate that there are no more documents in the cursor. Providing a mapping
|
||
|
|
* function that maps values to `null` will result in the cursor closing itself before it has finished iterating
|
||
|
|
* all documents. This will **not** result in a memory leak, just surprising behavior. For example:
|
||
|
|
*
|
||
|
|
* ```typescript
|
||
|
|
* const cursor = collection.find({});
|
||
|
|
* cursor.map(() => null);
|
||
|
|
*
|
||
|
|
* const documents = await cursor.toArray();
|
||
|
|
* // documents is always [], regardless of how many documents are in the collection.
|
||
|
|
* ```
|
||
|
|
*
|
||
|
|
* Other falsey values are allowed:
|
||
|
|
*
|
||
|
|
* ```typescript
|
||
|
|
* const cursor = collection.find({});
|
||
|
|
* cursor.map(() => '');
|
||
|
|
*
|
||
|
|
* const documents = await cursor.toArray();
|
||
|
|
* // documents is now an array of empty strings
|
||
|
|
* ```
|
||
|
|
*
|
||
|
|
* **Note for Typescript Users:** adding a transform changes the return type of the iteration of this cursor,
|
||
|
|
* it **does not** return a new instance of a cursor. This means when calling map,
|
||
|
|
* you should always assign the result to a new variable in order to get a correctly typed cursor variable.
|
||
|
|
* Take note of the following example:
|
||
|
|
*
|
||
|
|
* @example
|
||
|
|
* ```typescript
|
||
|
|
* const cursor: FindCursor<Document> = coll.find();
|
||
|
|
* const mappedCursor: FindCursor<number> = cursor.map(doc => Object.keys(doc).length);
|
||
|
|
* const keyCounts: number[] = await mappedCursor.toArray(); // cursor.toArray() still returns Document[]
|
||
|
|
* ```
|
||
|
|
* @param transform - The mapping transformation method.
|
||
|
|
*/
|
||
|
|
map(transform) {
|
||
|
|
assertUninitialized(this);
|
||
|
|
const oldTransform = this[kTransform]; // TODO(NODE-3283): Improve transform typing
|
||
|
|
if (oldTransform) {
|
||
|
|
this[kTransform] = doc => {
|
||
|
|
return transform(oldTransform(doc));
|
||
|
|
};
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
this[kTransform] = transform;
|
||
|
|
}
|
||
|
|
return this;
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Set the ReadPreference for the cursor.
|
||
|
|
*
|
||
|
|
* @param readPreference - The new read preference for the cursor.
|
||
|
|
*/
|
||
|
|
withReadPreference(readPreference) {
|
||
|
|
assertUninitialized(this);
|
||
|
|
if (readPreference instanceof read_preference_1.ReadPreference) {
|
||
|
|
this[kOptions].readPreference = readPreference;
|
||
|
|
}
|
||
|
|
else if (typeof readPreference === 'string') {
|
||
|
|
this[kOptions].readPreference = read_preference_1.ReadPreference.fromString(readPreference);
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
throw new error_1.MongoInvalidArgumentError(`Invalid read preference: ${readPreference}`);
|
||
|
|
}
|
||
|
|
return this;
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Set the ReadPreference for the cursor.
|
||
|
|
*
|
||
|
|
* @param readPreference - The new read preference for the cursor.
|
||
|
|
*/
|
||
|
|
withReadConcern(readConcern) {
|
||
|
|
assertUninitialized(this);
|
||
|
|
const resolvedReadConcern = read_concern_1.ReadConcern.fromOptions({ readConcern });
|
||
|
|
if (resolvedReadConcern) {
|
||
|
|
this[kOptions].readConcern = resolvedReadConcern;
|
||
|
|
}
|
||
|
|
return this;
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Set a maxTimeMS on the cursor query, allowing for hard timeout limits on queries (Only supported on MongoDB 2.6 or higher)
|
||
|
|
*
|
||
|
|
* @param value - Number of milliseconds to wait before aborting the query.
|
||
|
|
*/
|
||
|
|
maxTimeMS(value) {
|
||
|
|
assertUninitialized(this);
|
||
|
|
if (typeof value !== 'number') {
|
||
|
|
throw new error_1.MongoInvalidArgumentError('Argument for maxTimeMS must be a number');
|
||
|
|
}
|
||
|
|
this[kOptions].maxTimeMS = value;
|
||
|
|
return this;
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Set the batch size for the cursor.
|
||
|
|
*
|
||
|
|
* @param value - The number of documents to return per batch. See {@link https://www.mongodb.com/docs/manual/reference/command/find/|find command documentation}.
|
||
|
|
*/
|
||
|
|
batchSize(value) {
|
||
|
|
assertUninitialized(this);
|
||
|
|
if (this[kOptions].tailable) {
|
||
|
|
throw new error_1.MongoTailableCursorError('Tailable cursor does not support batchSize');
|
||
|
|
}
|
||
|
|
if (typeof value !== 'number') {
|
||
|
|
throw new error_1.MongoInvalidArgumentError('Operation "batchSize" requires an integer');
|
||
|
|
}
|
||
|
|
this[kOptions].batchSize = value;
|
||
|
|
return this;
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Rewind this cursor to its uninitialized state. Any options that are present on the cursor will
|
||
|
|
* remain in effect. Iterating this cursor will cause new queries to be sent to the server, even
|
||
|
|
* if the resultant data has already been retrieved by this cursor.
|
||
|
|
*/
|
||
|
|
rewind() {
|
||
|
|
if (!this[kInitialized]) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
this[kId] = null;
|
||
|
|
this[kDocuments].clear();
|
||
|
|
this[kClosed] = false;
|
||
|
|
this[kKilled] = false;
|
||
|
|
this[kInitialized] = false;
|
||
|
|
const session = this[kSession];
|
||
|
|
if (session) {
|
||
|
|
// We only want to end this session if we created it, and it hasn't ended yet
|
||
|
|
if (session.explicit === false) {
|
||
|
|
if (!session.hasEnded) {
|
||
|
|
session.endSession().catch(() => null);
|
||
|
|
}
|
||
|
|
this[kSession] = this.client.startSession({ owner: this, explicit: false });
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
/** @internal */
|
||
|
|
async getMore(batchSize) {
|
||
|
|
// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
|
||
|
|
const getMoreOperation = new get_more_1.GetMoreOperation(this[kNamespace], this[kId], this[kServer], {
|
||
|
|
...this[kOptions],
|
||
|
|
session: this[kSession],
|
||
|
|
batchSize
|
||
|
|
});
|
||
|
|
return (0, execute_operation_1.executeOperation)(this[kClient], getMoreOperation);
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* @internal
|
||
|
|
*
|
||
|
|
* This function is exposed for the unified test runner's createChangeStream
|
||
|
|
* operation. We cannot refactor to use the abstract _initialize method without
|
||
|
|
* a significant refactor.
|
||
|
|
*/
|
||
|
|
async [kInit]() {
|
||
|
|
try {
|
||
|
|
const state = await this._initialize(this[kSession]);
|
||
|
|
const response = state.response;
|
||
|
|
this[kServer] = state.server;
|
||
|
|
if (response.cursor) {
|
||
|
|
// TODO(NODE-2674): Preserve int64 sent from MongoDB
|
||
|
|
this[kId] =
|
||
|
|
typeof response.cursor.id === 'number'
|
||
|
|
? bson_1.Long.fromNumber(response.cursor.id)
|
||
|
|
: typeof response.cursor.id === 'bigint'
|
||
|
|
? bson_1.Long.fromBigInt(response.cursor.id)
|
||
|
|
: response.cursor.id;
|
||
|
|
if (response.cursor.ns) {
|
||
|
|
this[kNamespace] = (0, utils_1.ns)(response.cursor.ns);
|
||
|
|
}
|
||
|
|
this[kDocuments].pushMany(response.cursor.firstBatch);
|
||
|
|
}
|
||
|
|
// When server responses return without a cursor document, we close this cursor
|
||
|
|
// and return the raw server response. This is often the case for explain commands
|
||
|
|
// for example
|
||
|
|
if (this[kId] == null) {
|
||
|
|
this[kId] = bson_1.Long.ZERO;
|
||
|
|
// TODO(NODE-3286): ExecutionResult needs to accept a generic parameter
|
||
|
|
this[kDocuments].push(state.response);
|
||
|
|
}
|
||
|
|
// the cursor is now initialized, even if it is dead
|
||
|
|
this[kInitialized] = true;
|
||
|
|
}
|
||
|
|
catch (error) {
|
||
|
|
// the cursor is now initialized, even if an error occurred
|
||
|
|
this[kInitialized] = true;
|
||
|
|
await cleanupCursor(this, { error });
|
||
|
|
throw error;
|
||
|
|
}
|
||
|
|
if (this.isDead) {
|
||
|
|
await cleanupCursor(this, undefined);
|
||
|
|
}
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
/** @event */
|
||
|
|
AbstractCursor.CLOSE = 'close';
|
||
|
|
exports.AbstractCursor = AbstractCursor;
|
||
|
|
/**
|
||
|
|
* @param cursor - the cursor on which to call `next`
|
||
|
|
* @param blocking - a boolean indicating whether or not the cursor should `block` until data
|
||
|
|
* is available. Generally, this flag is set to `false` because if the getMore returns no documents,
|
||
|
|
* the cursor has been exhausted. In certain scenarios (ChangeStreams, tailable await cursors and
|
||
|
|
* `tryNext`, for example) blocking is necessary because a getMore returning no documents does
|
||
|
|
* not indicate the end of the cursor.
|
||
|
|
* @param transform - if true, the cursor's transform function is applied to the result document (if the transform exists)
|
||
|
|
* @returns the next document in the cursor, or `null`. When `blocking` is `true`, a `null` document means
|
||
|
|
* the cursor has been exhausted. Otherwise, it means that there is no document available in the cursor's buffer.
|
||
|
|
*/
|
||
|
|
async function next(cursor, { blocking, transform }) {
|
||
|
|
if (cursor.closed) {
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
do {
|
||
|
|
if (cursor[kId] == null) {
|
||
|
|
// All cursors must operate within a session, one must be made implicitly if not explicitly provided
|
||
|
|
await cursor[kInit]();
|
||
|
|
}
|
||
|
|
if (cursor[kDocuments].length !== 0) {
|
||
|
|
const doc = cursor[kDocuments].shift();
|
||
|
|
if (doc != null && transform && cursor[kTransform]) {
|
||
|
|
try {
|
||
|
|
return cursor[kTransform](doc);
|
||
|
|
}
|
||
|
|
catch (error) {
|
||
|
|
// `cleanupCursorAsync` should never throw, but if it does we want to throw the original
|
||
|
|
// error instead.
|
||
|
|
await cleanupCursor(cursor, { error, needsToEmitClosed: true }).catch(() => null);
|
||
|
|
throw error;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return doc;
|
||
|
|
}
|
||
|
|
if (cursor.isDead) {
|
||
|
|
// if the cursor is dead, we clean it up
|
||
|
|
// cleanupCursorAsync should never throw, but if it does it indicates a bug in the driver
|
||
|
|
// and we should surface the error
|
||
|
|
await cleanupCursor(cursor, {});
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
// otherwise need to call getMore
|
||
|
|
const batchSize = cursor[kOptions].batchSize || 1000;
|
||
|
|
try {
|
||
|
|
const response = await cursor.getMore(batchSize);
|
||
|
|
if (response) {
|
||
|
|
const cursorId = typeof response.cursor.id === 'number'
|
||
|
|
? bson_1.Long.fromNumber(response.cursor.id)
|
||
|
|
: typeof response.cursor.id === 'bigint'
|
||
|
|
? bson_1.Long.fromBigInt(response.cursor.id)
|
||
|
|
: response.cursor.id;
|
||
|
|
cursor[kDocuments].pushMany(response.cursor.nextBatch);
|
||
|
|
cursor[kId] = cursorId;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
catch (error) {
|
||
|
|
// `cleanupCursorAsync` should never throw, but if it does we want to throw the original
|
||
|
|
// error instead.
|
||
|
|
await cleanupCursor(cursor, { error }).catch(() => null);
|
||
|
|
throw error;
|
||
|
|
}
|
||
|
|
if (cursor.isDead) {
|
||
|
|
// If we successfully received a response from a cursor BUT the cursor indicates that it is exhausted,
|
||
|
|
// we intentionally clean up the cursor to release its session back into the pool before the cursor
|
||
|
|
// is iterated. This prevents a cursor that is exhausted on the server from holding
|
||
|
|
// onto a session indefinitely until the AbstractCursor is iterated.
|
||
|
|
//
|
||
|
|
// cleanupCursorAsync should never throw, but if it does it indicates a bug in the driver
|
||
|
|
// and we should surface the error
|
||
|
|
await cleanupCursor(cursor, {});
|
||
|
|
}
|
||
|
|
if (cursor[kDocuments].length === 0 && blocking === false) {
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
} while (!cursor.isDead || cursor[kDocuments].length !== 0);
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
async function cleanupCursor(cursor, options) {
|
||
|
|
const cursorId = cursor[kId];
|
||
|
|
const cursorNs = cursor[kNamespace];
|
||
|
|
const server = cursor[kServer];
|
||
|
|
const session = cursor[kSession];
|
||
|
|
const error = options?.error;
|
||
|
|
// Cursors only emit closed events once the client-side cursor has been exhausted fully or there
|
||
|
|
// was an error. Notably, when the server returns a cursor id of 0 and a non-empty batch, we
|
||
|
|
// cleanup the cursor but don't emit a `close` event.
|
||
|
|
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) {
|
||
|
|
await session.endSession({ error });
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
if (!session.inTransaction()) {
|
||
|
|
(0, sessions_1.maybeClearPinnedConnection)(session, { error });
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
async function completeCleanup() {
|
||
|
|
if (session) {
|
||
|
|
if (session.owner === cursor) {
|
||
|
|
try {
|
||
|
|
await session.endSession({ error });
|
||
|
|
}
|
||
|
|
finally {
|
||
|
|
cursor.emit(AbstractCursor.CLOSE);
|
||
|
|
}
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
if (!session.inTransaction()) {
|
||
|
|
(0, sessions_1.maybeClearPinnedConnection)(session, { error });
|
||
|
|
}
|
||
|
|
}
|
||
|
|
cursor.emit(AbstractCursor.CLOSE);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
cursor[kKilled] = true;
|
||
|
|
if (session.hasEnded) {
|
||
|
|
return completeCleanup();
|
||
|
|
}
|
||
|
|
try {
|
||
|
|
await (0, execute_operation_1.executeOperation)(cursor[kClient], new kill_cursors_1.KillCursorsOperation(cursorId, cursorNs, server, { session })).catch(() => null);
|
||
|
|
}
|
||
|
|
finally {
|
||
|
|
await completeCleanup();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
/** @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, { blocking: true, transform: true }).then(result => {
|
||
|
|
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;
|
||
|
|
}
|
||
|
|
}, 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);
|
||
|
|
});
|
||
|
|
}
|
||
|
|
}
|
||
|
|
//# sourceMappingURL=abstract_cursor.js.map
|