Yu1709$!%yuyu!$%wutu!5=126+

                
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/___/\  \/____  >____/\____/ \/\_/  
      \_/     \/    @ligmakokz

Editing: eachAsync.js

'use strict';

/*!
 * Module dependencies.
 */

const EachAsyncMultiError = require('../../error/eachAsyncMultiError');
const immediate = require('../immediate');
const promiseOrCallback = require('../promiseOrCallback');

/**
 * Execute `fn` for every document in the cursor. If `fn` returns a promise,
 * will wait for the promise to resolve before iterating on to the next one.
 * Returns a promise that resolves when done.
 *
 * @param {Function} next the thunk to call to get the next document
 * @param {Function} fn
 * @param {Object} options
 * @param {Number} [options.batchSize=null] if set, Mongoose will call `fn` with an array of at most `batchSize` documents, instead of a single document
 * @param {Number} [options.parallel=1] maximum number of `fn` calls that Mongoose will run in parallel
 * @param {AbortSignal} [options.signal] allow cancelling this eachAsync(). Once the abort signal is fired, `eachAsync()` will immediately fulfill the returned promise (or call the callback) and not fetch any more documents.
 * @param {Function} [callback] executed when all docs have been processed
 * @return {Promise}
 * @api public
 * @method eachAsync
 */

module.exports = function eachAsync(next, fn, options, callback) {
  const parallel = options.parallel || 1;
  const batchSize = options.batchSize;
  const signal = options.signal;
  const continueOnError = options.continueOnError;
  const aggregatedErrors = [];
  const enqueue = asyncQueue();

let aborted = false;

return promiseOrCallback(callback, cb => {
    if (signal != null) {
      if (signal.aborted) {
        return cb(null);
      }

signal.addEventListener('abort', () => {
        aborted = true;
        return cb(null);
      }, { once: true });
    }

if (batchSize != null) {
      if (typeof batchSize !== 'number') {
        throw new TypeError('batchSize must be a number');
      } else if (!Number.isInteger(batchSize)) {
        throw new TypeError('batchSize must be an integer');
      } else if (batchSize < 1) {
        throw new TypeError('batchSize must be at least 1');
      }
    }

iterate(cb);
  });

function iterate(finalCallback) {
    let handleResultsInProgress = 0;
    let currentDocumentIndex = 0;

let error = null;
    for (let i = 0; i < parallel; ++i) {
      enqueue(createFetch());
    }

function createFetch() {
      let documentsBatch = [];
      let drained = false;

return fetch;

function fetch(done) {
        if (drained || aborted) {
          return done();
        } else if (error) {
          return done();
        }

next(function(err, doc) {
          if (error != null) {
            return done();
          }
          if (err != null) {
            if (err.name === 'MongoCursorExhaustedError') {
              // We may end up calling `next()` multiple times on an exhausted
              // cursor, which leads to an error. In case cursor is exhausted,
              // just treat it as if the cursor returned no document, which is
              // how a cursor indicates it is exhausted.
              doc = null;
            } else if (continueOnError) {
              aggregatedErrors.push(err);
            } else {
              error = err;
              finalCallback(err);
              return done();
            }
          }
          if (doc == null) {
            drained = true;
            if (handleResultsInProgress <= 0) {
              const finalErr = continueOnError ?
                createEachAsyncMultiError(aggregatedErrors) :
                error;

finalCallback(finalErr);
            } else if (batchSize && documentsBatch.length) {
              handleNextResult(documentsBatch, currentDocumentIndex++, handleNextResultCallBack);
            }
            return done();
          }

++handleResultsInProgress;

// Kick off the subsequent `next()` before handling the result, but
          // make sure we know that we still have a result to handle re: #8422
          immediate(() => done());

if (batchSize) {
            documentsBatch.push(doc);
          }

// If the current documents size is less than the provided batch size don't process the documents yet
          if (batchSize && documentsBatch.length !== batchSize) {
            immediate(() => enqueue(fetch));
            return;
          }

const docsToProcess = batchSize ? documentsBatch : doc;

immediate(() => enqueue(fetch));
          }

handleNextResult(docsToProcess, currentDocumentIndex++, handleNextResultCallBack);
        });
      }
    }
  }

// `next()` can only execute one at a time, so make sure we always execute
// `next()` in series, while still allowing multiple `fn()` instances to run
// in parallel.
function asyncQueue() {
  const _queue = [];
  let inProgress = null;
  let id = 0;

return function enqueue(fn) {
    if (
      inProgress === null &&
      _queue.length === 0
    ) {
      inProgress = id++;
      return fn(_step);
    }
    _queue.push(fn);
  };

function _step() {
    if (_queue.length !== 0) {
      inProgress = id++;
      const fn = _queue.shift();
      fn(_step);
    } else {
      inProgress = null;
    }
  }
}

function createEachAsyncMultiError(aggregatedErrors) {
  if (aggregatedErrors.length === 0) {
    return null;
  }

return new EachAsyncMultiError(aggregatedErrors);
}

Name	Type	Actions
eachAsync.js	File