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'use strict';
const common = require('../common');
const assert = require('assert');
const path = require('path');
const { writeFile, readFile } = require('fs').promises;
const tmpdir = require('../common/tmpdir');
tmpdir.refresh();
const fn = path.join(tmpdir.path, 'large-file');
// Creating large buffer with random content
const largeBuffer = Buffer.from(
Array.apply(null, { length: 16834 * 2 })
.map(Math.random)
.map((number) => (number * (1 << 8)))
);
async function createLargeFile() {
// Writing buffer to a file then try to read it
await writeFile(fn, largeBuffer);
}
async function validateReadFile() {
const readBuffer = await readFile(fn);
assert.strictEqual(readBuffer.equals(largeBuffer), true);
}
async function validateReadFileProc() {
// Test to make sure reading a file under the /proc directory works. Adapted
// from test-fs-read-file-sync-hostname.js.
// Refs:
// - https://groups.google.com/forum/#!topic/nodejs-dev/rxZ_RoH1Gn0
// - https://github.com/nodejs/node/issues/21331
// Test is Linux-specific.
if (!common.isLinux)
return;
const hostname = await readFile('/proc/sys/kernel/hostname');
assert.ok(hostname.length > 0);
}
function validateReadFileAbortLogicBefore() {
const controller = new AbortController();
const signal = controller.signal;
controller.abort();
assert.rejects(readFile(fn, { signal }), {
name: 'AbortError'
});
}
function validateReadFileAbortLogicDuring() {
const controller = new AbortController();
const signal = controller.signal;
process.nextTick(() => controller.abort());
assert.rejects(readFile(fn, { signal }), {
name: 'AbortError'
});
}
async function validateWrongSignalParam() {
// Verify that if something different than Abortcontroller.signal
// is passed, ERR_INVALID_ARG_TYPE is thrown
await assert.rejects(async () => {
const callback = common.mustNotCall(() => {});
await readFile(fn, { signal: 'hello' }, callback);
}, { code: 'ERR_INVALID_ARG_TYPE', name: 'TypeError' });
}
(async () => {
await createLargeFile();
await validateReadFile();
await validateReadFileProc();
await validateReadFileAbortLogicBefore();
await validateReadFileAbortLogicDuring();
await validateWrongSignalParam();
})().then(common.mustCall());
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