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'use strict';
const common = require('../common');
const assert = require('assert');
const fs = require('fs');
const path = require('path');
const tmpdir = require('../common/tmpdir');
// Basic usage tests.
assert.throws(
() => {
fs.watchFile('./some-file');
},
{
code: 'ERR_INVALID_ARG_TYPE',
name: 'TypeError'
});
assert.throws(
() => {
fs.watchFile('./another-file', {}, 'bad listener');
},
{
code: 'ERR_INVALID_ARG_TYPE',
name: 'TypeError'
});
assert.throws(() => {
fs.watchFile(new Object(), common.mustNotCall());
}, { code: 'ERR_INVALID_ARG_TYPE', name: 'TypeError' });
const enoentFile = path.join(tmpdir.path, 'non-existent-file');
const expectedStatObject = new fs.Stats(
0, // dev
0, // mode
0, // nlink
0, // uid
0, // gid
0, // rdev
0, // blksize
0, // ino
0, // size
0, // blocks
Date.UTC(1970, 0, 1, 0, 0, 0), // atime
Date.UTC(1970, 0, 1, 0, 0, 0), // mtime
Date.UTC(1970, 0, 1, 0, 0, 0), // ctime
Date.UTC(1970, 0, 1, 0, 0, 0) // birthtime
);
tmpdir.refresh();
// If the file initially didn't exist, and gets created at a later point of
// time, the callback should be invoked again with proper values in stat object
let fileExists = false;
const watcher =
fs.watchFile(enoentFile, { interval: 0 }, common.mustCall((curr, prev) => {
if (!fileExists) {
// If the file does not exist, all the fields should be zero and the date
// fields should be UNIX EPOCH time
assert.deepStrictEqual(curr, expectedStatObject);
assert.deepStrictEqual(prev, expectedStatObject);
// Create the file now, so that the callback will be called back once the
// event loop notices it.
fs.closeSync(fs.openSync(enoentFile, 'w'));
fileExists = true;
} else {
// If the ino (inode) value is greater than zero, it means that the file
// is present in the filesystem and it has a valid inode number.
assert(curr.ino > 0);
// As the file just got created, previous ino value should be lesser than
// or equal to zero (non-existent file).
assert(prev.ino <= 0);
// Stop watching the file
fs.unwatchFile(enoentFile);
watcher.stop(); // Stopping a stopped watcher should be a noop
}
}, 2));
// 'stop' should only be emitted once - stopping a stopped watcher should
// not trigger a 'stop' event.
watcher.on('stop', common.mustCall(function onStop() {}));
// Watch events should callback with a filename on supported systems.
// Omitting AIX. It works but not reliably.
if (common.isLinux || common.isOSX || common.isWindows) {
const dir = path.join(tmpdir.path, 'watch');
fs.mkdir(dir, common.mustCall(function(err) {
if (err) assert.fail(err);
fs.watch(dir, common.mustCall(function(eventType, filename) {
clearInterval(interval);
this._handle.close();
assert.strictEqual(filename, 'foo.txt');
}));
const interval = setInterval(() => {
fs.writeFile(path.join(dir, 'foo.txt'), 'foo', common.mustCall((err) => {
if (err) assert.fail(err);
}));
}, 1);
}));
}
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