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1'use strict';
2
3const common = require('../common');
4const fs = require('fs');
5const path = require('path');
6
7const bench = common.createBenchmark(main, {
8  n: [100],
9  dir: [ 'lib', 'test/parallel'],
10  mode: [ 'async', 'sync', 'callback' ],
11  bufferSize: [ 4, 32, 1024 ],
12});
13
14async function main({ n, dir, mode, bufferSize }) {
15  const fullPath = path.resolve(__dirname, '../../', dir);
16
17  bench.start();
18
19  let counter = 0;
20  for (let i = 0; i < n; i++) {
21    if (mode === 'async') {
22      const dir = await fs.promises.opendir(fullPath, { bufferSize });
23      // eslint-disable-next-line no-unused-vars
24      for await (const entry of dir)
25        counter++;
26    } else if (mode === 'callback') {
27      const dir = await fs.promises.opendir(fullPath, { bufferSize });
28      await new Promise((resolve, reject) => {
29        function read() {
30          dir.read((err, entry) => {
31            if (err) {
32              reject(err);
33            } else if (entry === null) {
34              resolve(dir.close());
35            } else {
36              counter++;
37              read();
38            }
39          });
40        }
41
42        read();
43      });
44    } else {
45      const dir = fs.opendirSync(fullPath, { bufferSize });
46      while (dir.readSync() !== null)
47        counter++;
48      dir.closeSync();
49    }
50  }
51
52  bench.end(counter);
53}
54