watcher/dist_ts/watcher.js
2024-04-18 21:12:37 +02:00

397 lines
39 KiB
JavaScript

/* IMPORT */
import { EventEmitter } from 'node:events';
import fs from 'node:fs';
import path from 'node:path';
import { DEPTH, LIMIT, HAS_NATIVE_RECURSION, POLLING_INTERVAL } from './constants.js';
import { TargetEvent, WatcherEvent } from './enums.js';
import Utils from './utils.js';
import WatcherHandler from './watcher_handler.js';
import WatcherLocker from './watcher_locker.js';
import WatcherPoller from './watcher_poller.js';
/* MAIN */
class Watcher extends EventEmitter {
/* CONSTRUCTOR */
constructor(target, options, handler) {
super();
this._closed = false;
this._ready = false;
this._closeAborter = new AbortController();
this._closeSignal = this._closeAborter.signal;
this.on(WatcherEvent.CLOSE, () => this._closeAborter.abort());
this._closeWait = new Promise(resolve => this.on(WatcherEvent.CLOSE, resolve));
this._readyWait = new Promise(resolve => this.on(WatcherEvent.READY, resolve));
this._locker = new WatcherLocker(this);
this._roots = new Set();
this._poller = new WatcherPoller();
this._pollers = new Set();
this._subwatchers = new Set();
this._watchers = {};
this._watchersLock = Promise.resolve();
this._watchersRestorable = {};
this.watch(target, options, handler);
}
/* API */
isClosed() {
return this._closed;
}
isIgnored(targetPath, ignore) {
return !!ignore && (Utils.lang.isFunction(ignore) ? !!ignore(targetPath) : ignore.test(targetPath));
}
isReady() {
return this._ready;
}
close() {
this._locker.reset();
this._poller.reset();
this._roots.clear();
this.watchersClose();
if (this.isClosed())
return false;
this._closed = true;
return this.emit(WatcherEvent.CLOSE);
}
error(exception) {
if (this.isClosed())
return false;
const error = Utils.lang.castError(exception);
return this.emit(WatcherEvent.ERROR, error);
}
event(event, targetPath, targetPathNext) {
if (this.isClosed())
return false;
this.emit(WatcherEvent.ALL, event, targetPath, targetPathNext);
return this.emit(event, targetPath, targetPathNext);
}
ready() {
if (this.isClosed() || this.isReady())
return false;
this._ready = true;
return this.emit(WatcherEvent.READY);
}
pollerExists(targetPath, options) {
for (const poller of this._pollers) {
if (poller.targetPath !== targetPath)
continue;
if (!Utils.lang.isShallowEqual(poller.options, options))
continue;
return true;
}
return false;
}
subwatcherExists(targetPath, options) {
for (const subwatcher of this._subwatchers) {
if (subwatcher.targetPath !== targetPath)
continue;
if (!Utils.lang.isShallowEqual(subwatcher.options, options))
continue;
return true;
}
return false;
}
watchersClose(folderPath, filePath, recursive = true) {
if (!folderPath) {
for (const folderPath in this._watchers) {
this.watchersClose(folderPath, filePath, false);
}
}
else {
const configs = this._watchers[folderPath];
if (configs) {
for (const config of [...configs]) { // It's important to clone the array, as items will be deleted from it also
if (filePath && config.filePath !== filePath)
continue;
this.watcherClose(config);
}
}
if (recursive) {
for (const folderPathOther in this._watchers) {
if (!Utils.fs.isSubPath(folderPath, folderPathOther))
continue;
this.watchersClose(folderPathOther, filePath, false);
}
}
}
}
watchersLock(callback) {
return this._watchersLock.then(() => {
return this._watchersLock = new Promise(async (resolve) => {
await callback();
resolve();
});
});
}
watchersRestore() {
delete this._watchersRestoreTimeout;
const watchers = Object.entries(this._watchersRestorable);
this._watchersRestorable = {};
for (const [targetPath, config] of watchers) {
this.watchPath(targetPath, config.options, config.handler);
}
}
async watcherAdd(config, baseWatcherHandler) {
const { folderPath } = config;
const configs = this._watchers[folderPath] = (this._watchers[folderPath] || []);
configs.push(config);
const watcherHandler = new WatcherHandler(this, config, baseWatcherHandler);
await watcherHandler.init();
return watcherHandler;
}
watcherClose(config) {
config.watcher.close();
const configs = this._watchers[config.folderPath];
if (configs) {
const index = configs.indexOf(config);
configs.splice(index, 1);
if (!configs.length) {
delete this._watchers[config.folderPath];
}
}
const rootPath = config.filePath || config.folderPath;
const isRoot = this._roots.has(rootPath);
if (isRoot) {
this._watchersRestorable[rootPath] = config;
if (!this._watchersRestoreTimeout) {
this._watchersRestoreTimeout = Utils.lang.defer(() => this.watchersRestore());
}
}
}
watcherExists(folderPath, options, handler, filePath) {
const configsSibling = this._watchers[folderPath];
if (!!configsSibling?.find(config => config.handler === handler && (!config.filePath || config.filePath === filePath) && config.options.ignore === options.ignore && !!config.options.native === !!options.native && (!options.recursive || config.options.recursive)))
return true;
let folderAncestorPath = path.dirname(folderPath);
for (let depth = 1; depth < Infinity; depth++) {
const configsAncestor = this._watchers[folderAncestorPath];
if (!!configsAncestor?.find(config => (depth === 1 || (config.options.recursive && depth <= (config.options.depth ?? DEPTH))) && config.handler === handler && (!config.filePath || config.filePath === filePath) && config.options.ignore === options.ignore && !!config.options.native === !!options.native && (!options.recursive || (config.options.recursive && (HAS_NATIVE_RECURSION && config.options.native !== false)))))
return true;
if (!HAS_NATIVE_RECURSION)
break; // No other ancestor will possibly be found
const folderAncestorPathNext = path.dirname(folderPath);
if (folderAncestorPath === folderAncestorPathNext)
break;
folderAncestorPath = folderAncestorPathNext;
}
return false;
}
async watchDirectories(foldersPaths, options, handler, filePath, baseWatcherHandler) {
if (this.isClosed())
return;
foldersPaths = Utils.lang.uniq(foldersPaths).sort();
let watcherHandlerLast;
for (const folderPath of foldersPaths) {
if (this.isIgnored(folderPath, options.ignore))
continue;
if (this.watcherExists(folderPath, options, handler, filePath))
continue;
try {
const watcherOptions = (!options.recursive || (HAS_NATIVE_RECURSION && options.native !== false)) ? options : { ...options, recursive: false }; // Ensuring recursion is explicitly disabled if not available
const watcher = fs.watch(folderPath, watcherOptions);
const watcherConfig = { watcher, handler, options, folderPath, filePath };
const watcherHandler = watcherHandlerLast = await this.watcherAdd(watcherConfig, baseWatcherHandler);
const isRoot = this._roots.has(filePath || folderPath);
if (isRoot) {
const parentOptions = { ...options, ignoreInitial: true, recursive: false }; // Ensuring only the parent folder is being watched
const parentFolderPath = path.dirname(folderPath);
const parentFilePath = folderPath;
await this.watchDirectories([parentFolderPath], parentOptions, handler, parentFilePath, watcherHandler);
//TODO: Watch parents recursively with the following code, which requires other things to be changed too though
// while ( true ) {
// await this.watchDirectories ( [parentFolderPath], parentOptions, handler, parentFilePath, watcherHandler );
// const parentFolderPathNext = path.dirname ( parentFolderPath );
// if ( parentFolderPath === parentFolderPathNext ) break;
// parentFilePath = parentFolderPath;
// parentFolderPath = parentFolderPathNext;
// }
}
}
catch (error) {
this.error(error);
}
}
return watcherHandlerLast;
}
async watchDirectory(folderPath, options, handler, filePath, baseWatcherHandler) {
if (this.isClosed())
return;
if (this.isIgnored(folderPath, options.ignore))
return;
if (!options.recursive || (HAS_NATIVE_RECURSION && options.native !== false)) {
return this.watchersLock(() => {
return this.watchDirectories([folderPath], options, handler, filePath, baseWatcherHandler);
});
}
else {
options = { ...options, recursive: true }; // Ensuring recursion is explicitly enabled
const depth = options.depth ?? DEPTH;
const limit = options.limit ?? LIMIT;
const [folderSubPaths] = await Utils.fs.readdir(folderPath, options.ignore, depth, limit, this._closeSignal, options.readdirMap);
return this.watchersLock(async () => {
const watcherHandler = await this.watchDirectories([folderPath], options, handler, filePath, baseWatcherHandler);
if (folderSubPaths.length) {
const folderPathDepth = Utils.fs.getDepth(folderPath);
for (const folderSubPath of folderSubPaths) {
const folderSubPathDepth = Utils.fs.getDepth(folderSubPath);
const subDepth = Math.max(0, depth - (folderSubPathDepth - folderPathDepth));
const subOptions = { ...options, depth: subDepth }; // Updating the maximum depth to account for depth of the sub path
await this.watchDirectories([folderSubPath], subOptions, handler, filePath, baseWatcherHandler || watcherHandler);
}
}
});
}
}
async watchFileOnce(filePath, options, callback) {
if (this.isClosed())
return;
options = { ...options, ignoreInitial: false }; // Ensuring initial events are detected too
if (this.subwatcherExists(filePath, options))
return;
const config = { targetPath: filePath, options };
const handler = (event, targetPath) => {
if (targetPath !== filePath)
return;
stop();
callback();
};
const watcher = new Watcher(handler);
const start = () => {
this._subwatchers.add(config);
this.on(WatcherEvent.CLOSE, stop); // Ensuring the subwatcher is stopped on close
watcher.watchFile(filePath, options, handler);
};
const stop = () => {
this._subwatchers.delete(config);
this.removeListener(WatcherEvent.CLOSE, stop); // Ensuring there are no leftover listeners
watcher.close();
};
return start();
}
async watchFile(filePath, options, handler) {
if (this.isClosed())
return;
if (this.isIgnored(filePath, options.ignore))
return;
options = { ...options, recursive: false }; // Ensuring recursion is explicitly disabled
const folderPath = path.dirname(filePath);
return this.watchDirectory(folderPath, options, handler, filePath);
}
async watchPollingOnce(targetPath, options, callback) {
if (this.isClosed())
return;
let isDone = false;
const poller = new WatcherPoller();
const disposer = await this.watchPolling(targetPath, options, async () => {
if (isDone)
return;
const events = await poller.update(targetPath, options.pollingTimeout);
if (!events.length)
return; // Nothing actually changed, skipping
if (isDone)
return; // Another async callback has done the work already, skipping
isDone = true;
disposer();
callback();
});
}
async watchPolling(targetPath, options, callback) {
if (this.isClosed())
return Utils.lang.noop;
if (this.pollerExists(targetPath, options))
return Utils.lang.noop;
const watcherOptions = { ...options, interval: options.pollingInterval ?? POLLING_INTERVAL }; // Ensuring a default interval is set
const config = { targetPath, options };
const start = () => {
this._pollers.add(config);
this.on(WatcherEvent.CLOSE, stop); // Ensuring polling is stopped on close
fs.watchFile(targetPath, watcherOptions, callback);
};
const stop = () => {
this._pollers.delete(config);
this.removeListener(WatcherEvent.CLOSE, stop); // Ensuring there are no leftover listeners
fs.unwatchFile(targetPath, callback);
};
Utils.lang.attempt(start);
return () => Utils.lang.attempt(stop);
}
async watchUnknownChild(targetPath, options, handler) {
if (this.isClosed())
return;
const watch = () => this.watchPath(targetPath, options, handler);
return this.watchFileOnce(targetPath, options, watch);
}
async watchUnknownTarget(targetPath, options, handler) {
if (this.isClosed())
return;
const watch = () => this.watchPath(targetPath, options, handler);
return this.watchPollingOnce(targetPath, options, watch);
}
async watchPaths(targetPaths, options, handler) {
if (this.isClosed())
return;
targetPaths = Utils.lang.uniq(targetPaths).sort();
const isParallelizable = targetPaths.every((targetPath, index) => targetPaths.every((t, i) => i === index || !Utils.fs.isSubPath(targetPath, t))); // All paths are about separate subtrees, so we can start watching in parallel safely //TODO: Find parallelizable chunks rather than using an all or nothing approach
if (isParallelizable) { // Watching in parallel
await Promise.all(targetPaths.map(targetPath => {
return this.watchPath(targetPath, options, handler);
}));
}
else { // Watching serially
for (const targetPath of targetPaths) {
await this.watchPath(targetPath, options, handler);
}
}
}
async watchPath(targetPath, options, handler) {
if (this.isClosed())
return;
targetPath = path.resolve(targetPath);
if (this.isIgnored(targetPath, options.ignore))
return;
const stats = await Utils.fs.poll(targetPath, options.pollingTimeout);
if (!stats) {
const parentPath = path.dirname(targetPath);
const parentStats = await Utils.fs.poll(parentPath, options.pollingTimeout);
if (parentStats?.isDirectory()) {
return this.watchUnknownChild(targetPath, options, handler);
}
else {
return this.watchUnknownTarget(targetPath, options, handler);
}
}
else if (stats.isFile()) {
return this.watchFile(targetPath, options, handler);
}
else if (stats.isDirectory()) {
return this.watchDirectory(targetPath, options, handler);
}
else {
this.error(`"${targetPath}" is not supported`);
}
}
async watch(target, options, handler = Utils.lang.noop) {
if (Utils.lang.isFunction(target))
return this.watch([], {}, target);
if (Utils.lang.isUndefined(target))
return this.watch([], options, handler);
if (Utils.lang.isFunction(options))
return this.watch(target, {}, options);
if (Utils.lang.isUndefined(options))
return this.watch(target, {}, handler);
if (this.isClosed())
return;
if (this.isReady())
options.readdirMap = undefined; // Only usable before initialization
const targetPaths = Utils.lang.castArray(target);
targetPaths.forEach(targetPath => this._roots.add(targetPath));
await this.watchPaths(targetPaths, options, handler);
if (this.isClosed())
return;
if (handler !== Utils.lang.noop) {
this.on(WatcherEvent.ALL, handler);
}
options.readdirMap = undefined; // Only usable before initialization
this.ready();
}
}
/* EXPORT */
export default Watcher;
//# 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