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authorGravatar Piotr Russ <mail@pruss.it> 2020-11-16 00:10:28 +0100
committerGravatar Piotr Russ <mail@pruss.it> 2020-11-16 00:10:28 +0100
commite06ec920f7a5d784e674c4c4b4e6d1da3dc7391d (patch)
tree55713f725f77b44ebfec86e4eec3ce33e71458ca /node_modules/p-limit/index.js
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Diffstat (limited to 'node_modules/p-limit/index.js')
-rw-r--r--node_modules/p-limit/index.js42
1 files changed, 42 insertions, 0 deletions
diff --git a/node_modules/p-limit/index.js b/node_modules/p-limit/index.js
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+'use strict';
+const pTry = require('p-try');
+
+module.exports = concurrency => {
+ if (concurrency < 1) {
+ throw new TypeError('Expected `concurrency` to be a number from 1 and up');
+ }
+
+ const queue = [];
+ let activeCount = 0;
+
+ const next = () => {
+ activeCount--;
+
+ if (queue.length > 0) {
+ queue.shift()();
+ }
+ };
+
+ return fn => new Promise((resolve, reject) => {
+ const run = () => {
+ activeCount++;
+
+ pTry(fn).then(
+ val => {
+ resolve(val);
+ next();
+ },
+ err => {
+ reject(err);
+ next();
+ }
+ );
+ };
+
+ if (activeCount < concurrency) {
+ run();
+ } else {
+ queue.push(run);
+ }
+ });
+};