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- 'use strict';
-
- const KillCursor = require('../connection/commands').KillCursor;
- const MongoError = require('../error').MongoError;
- const MongoNetworkError = require('../error').MongoNetworkError;
- const collectionNamespace = require('./shared').collectionNamespace;
- const maxWireVersion = require('../utils').maxWireVersion;
- const command = require('./command');
-
- function killCursors(server, ns, cursorState, callback) {
- callback = typeof callback === 'function' ? callback : () => {};
- const cursorId = cursorState.cursorId;
-
- if (maxWireVersion(server) < 4) {
- const bson = server.s.bson;
- const pool = server.s.pool;
- const killCursor = new KillCursor(bson, ns, [cursorId]);
- const options = {
- immediateRelease: true,
- noResponse: true
- };
-
- if (typeof cursorState.session === 'object') {
- options.session = cursorState.session;
- }
-
- if (pool && pool.isConnected()) {
- try {
- pool.write(killCursor, options, callback);
- } catch (err) {
- if (typeof callback === 'function') {
- callback(err, null);
- } else {
- console.warn(err);
- }
- }
- }
-
- return;
- }
-
- const killCursorCmd = {
- killCursors: collectionNamespace(ns),
- cursors: [cursorId]
- };
-
- const options = {};
- if (typeof cursorState.session === 'object') options.session = cursorState.session;
-
- command(server, ns, killCursorCmd, options, (err, result) => {
- if (err) {
- return callback(err);
- }
-
- const response = result.message;
- if (response.cursorNotFound) {
- return callback(new MongoNetworkError('cursor killed or timed out'), null);
- }
-
- if (!Array.isArray(response.documents) || response.documents.length === 0) {
- return callback(
- new MongoError(`invalid killCursors result returned for cursor id ${cursorId}`)
- );
- }
-
- callback(null, response.documents[0]);
- });
- }
-
- module.exports = killCursors;
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