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54 lines
1.7 KiB
JavaScript
54 lines
1.7 KiB
JavaScript
// deno-fmt-ignore-file
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// deno-lint-ignore-file
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// Copyright Joyent and Node contributors. All rights reserved. MIT license.
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// Taken from Node 18.12.1
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// This file is automatically generated by `tools/node_compat/setup.ts`. Do not modify this file manually.
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'use strict';
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const common = require('../common');
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const fixtures = require('../common/fixtures');
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const assert = require('assert');
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const fs = require('fs');
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// Test that concurrent file read streams don’t interfere with each other’s
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// contents, and that the chunks generated by the reads only retain a
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// 'reasonable' amount of memory.
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// Refs: https://github.com/nodejs/node/issues/21967
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const filename = fixtures.path('loop.js'); // Some small non-homogeneous file.
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const content = fs.readFileSync(filename);
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const N = 2000;
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let started = 0;
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let done = 0;
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const arrayBuffers = new Set();
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function startRead() {
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++started;
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const chunks = [];
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fs.createReadStream(filename)
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.on('data', (chunk) => {
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chunks.push(chunk);
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arrayBuffers.add(chunk.buffer);
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})
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.on('end', common.mustCall(() => {
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if (started < N)
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startRead();
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assert.deepStrictEqual(Buffer.concat(chunks), content);
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if (++done === N) {
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const retainedMemory =
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[...arrayBuffers].map((ab) => ab.byteLength).reduce((a, b) => a + b);
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assert(retainedMemory / (N * content.length) <= 3,
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`Retaining ${retainedMemory} bytes in ABs for ${N} ` +
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`chunks of size ${content.length}`);
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}
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}));
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}
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// Don’t start the reads all at once – that way we would have to allocate
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// a large amount of memory upfront.
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for (let i = 0; i < 6; ++i)
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startRead();
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