signaling_server/service/node_modules/p-limit/index.js

   1 'use strict';
   2 const pTry = require('p-try');
   3
   4 const pLimit = concurrency => {
   5         if (!((Number.isInteger(concurrency) || concurrency === Infinity) && concurrency > 0)) {
   6                 return Promise.reject(new TypeError('Expected `concurrency` to be a number from 1 and up'));
   7         }
   8
   9         const queue = [];
  10         let activeCount = 0;
  11
  12         const next = () => {
  13                 activeCount--;
  14
  15                 if (queue.length > 0) {
  16                         queue.shift()();
  17                 }
  18         };
  19
  20         const run = (fn, resolve, ...args) => {
  21                 activeCount++;
  22
  23                 const result = pTry(fn, ...args);
  24
  25                 resolve(result);
  26
  27                 result.then(next, next);
  28         };
  29
  30         const enqueue = (fn, resolve, ...args) => {
  31                 if (activeCount < concurrency) {
  32                         run(fn, resolve, ...args);
  33                 } else {
  34                         queue.push(run.bind(null, fn, resolve, ...args));
  35                 }
  36         };
  37
  38         const generator = (fn, ...args) => new Promise(resolve => enqueue(fn, resolve, ...args));
  39         Object.defineProperties(generator, {
  40                 activeCount: {
  41                         get: () => activeCount
  42                 },
  43                 pendingCount: {
  44                         get: () => queue.length
  45                 },
  46                 clearQueue: {
  47                         value: () => {
  48                                 queue.length = 0;
  49                         }
  50                 }
  51         });
  52
  53         return generator;
  54 };
  55
  56 module.exports = pLimit;
  57 module.exports.default = pLimit;