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const {
SafeMap,
SafeSet,
StringPrototypeStartsWith,
} = primordials;
const { validateNumber, validateOneOf } = require('internal/validators');
const { kEmptyObject } = require('internal/util');
const { TIMEOUT_MAX } = require('internal/timers');
const EventEmitter = require('events');
const { watch } = require('fs');
const { fileURLToPath } = require('url');
const { resolve, dirname } = require('path');
const { setTimeout } = require('timers');
const supportsRecursiveWatching = process.platform === 'win32' ||
process.platform === 'darwin';
class FilesWatcher extends EventEmitter {
#watchers = new SafeMap();
#filteredFiles = new SafeSet();
#throttling = new SafeSet();
#throttle;
#mode;
constructor({ throttle = 500, mode = 'filter' } = kEmptyObject) {
super();
validateNumber(throttle, 'options.throttle', 0, TIMEOUT_MAX);
validateOneOf(mode, 'options.mode', ['filter', 'all']);
this.#throttle = throttle;
this.#mode = mode;
}
#isPathWatched(path) {
if (this.#watchers.has(path)) {
return true;
}
for (const { 0: watchedPath, 1: watcher } of this.#watchers.entries()) {
if (watcher.recursive && StringPrototypeStartsWith(path, watchedPath)) {
return true;
}
}
return false;
}
#removeWatchedChildren(path) {
for (const { 0: watchedPath, 1: watcher } of this.#watchers.entries()) {
if (path !== watchedPath && StringPrototypeStartsWith(watchedPath, path)) {
this.#unwatch(watcher);
this.#watchers.delete(watchedPath);
}
}
}
#unwatch(watcher) {
watcher.handle.removeAllListeners();
watcher.handle.close();
}
#onChange(trigger) {
if (this.#throttling.has(trigger)) {
return;
}
if (this.#mode === 'filter' && !this.#filteredFiles.has(trigger)) {
return;
}
this.#throttling.add(trigger);
this.emit('changed');
setTimeout(() => this.#throttling.delete(trigger), this.#throttle).unref();
}
get watchedPaths() {
return [...this.#watchers.keys()];
}
watchPath(path, recursive = true) {
if (this.#isPathWatched(path)) {
return;
}
const watcher = watch(path, { recursive });
watcher.on('change', (eventType, fileName) => this
.#onChange(recursive ? resolve(path, fileName) : path));
this.#watchers.set(path, { handle: watcher, recursive });
if (recursive) {
this.#removeWatchedChildren(path);
}
}
filterFile(file) {
if (supportsRecursiveWatching) {
this.watchPath(dirname(file));
} else {
// Having multiple FSWatcher's seems to be slower
// than a single recursive FSWatcher
this.watchPath(file, false);
}
this.#filteredFiles.add(file);
}
watchChildProcessModules(child) {
if (this.#mode !== 'filter') {
return;
}
child.on('message', (message) => {
try {
if (message['watch:require']) {
this.filterFile(message['watch:require']);
}
if (message['watch:import']) {
this.filterFile(fileURLToPath(message['watch:import']));
}
} catch {
// Failed watching file. ignore
}
});
}
clearFileFilters() {
this.#filteredFiles.clear();
}
clear() {
this.#watchers.forEach(this.#unwatch);
this.#watchers.clear();
this.#filteredFiles.clear();
}
}
module.exports = { FilesWatcher };
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