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const {
FunctionPrototypeCall,
ObjectDefineProperty,
ObjectSetPrototypeOf,
Symbol,
} = primordials;
const {
AbortError,
uvException,
codes: {
ERR_INVALID_ARG_VALUE,
},
} = require('internal/errors');
const { createDeferredPromise } = require('internal/util');
const {
kFsStatsFieldsNumber,
StatWatcher: _StatWatcher
} = internalBinding('fs');
const { FSEvent } = internalBinding('fs_event_wrap');
const { UV_ENOSPC } = internalBinding('uv');
const { EventEmitter } = require('events');
const {
getStatsFromBinding,
getValidatedPath
} = require('internal/fs/utils');
const {
defaultTriggerAsyncIdScope,
symbols: { owner_symbol }
} = require('internal/async_hooks');
const { toNamespacedPath } = require('path');
const {
validateAbortSignal,
validateBoolean,
validateObject,
validateUint32,
} = require('internal/validators');
const {
Buffer: {
isEncoding,
},
} = require('buffer');
const assert = require('internal/assert');
const kOldStatus = Symbol('kOldStatus');
const kUseBigint = Symbol('kUseBigint');
const kFSWatchStart = Symbol('kFSWatchStart');
const kFSStatWatcherStart = Symbol('kFSStatWatcherStart');
const KFSStatWatcherRefCount = Symbol('KFSStatWatcherRefCount');
const KFSStatWatcherMaxRefCount = Symbol('KFSStatWatcherMaxRefCount');
const kFSStatWatcherAddOrCleanRef = Symbol('kFSStatWatcherAddOrCleanRef');
function emitStop(self) {
self.emit('stop');
}
function StatWatcher(bigint) {
FunctionPrototypeCall(EventEmitter, this);
this._handle = null;
this[kOldStatus] = -1;
this[kUseBigint] = bigint;
this[KFSStatWatcherRefCount] = 1;
this[KFSStatWatcherMaxRefCount] = 1;
}
ObjectSetPrototypeOf(StatWatcher.prototype, EventEmitter.prototype);
ObjectSetPrototypeOf(StatWatcher, EventEmitter);
function onchange(newStatus, stats) {
const self = this[owner_symbol];
if (self[kOldStatus] === -1 &&
newStatus === -1 &&
stats[2/* new nlink */] === stats[16/* old nlink */]) {
return;
}
self[kOldStatus] = newStatus;
self.emit('change', getStatsFromBinding(stats),
getStatsFromBinding(stats, kFsStatsFieldsNumber));
}
// At the moment if filename is undefined, we
// 1. Throw an Error if it's the first
// time Symbol('kFSStatWatcherStart') is called
// 2. Return silently if Symbol('kFSStatWatcherStart') has already been called
// on a valid filename and the wrap has been initialized
// This method is a noop if the watcher has already been started.
StatWatcher.prototype[kFSStatWatcherStart] = function(filename,
persistent,
interval) {
if (this._handle !== null)
return;
this._handle = new _StatWatcher(this[kUseBigint]);
this._handle[owner_symbol] = this;
this._handle.onchange = onchange;
if (!persistent)
this.unref();
// uv_fs_poll is a little more powerful than ev_stat but we curb it for
// the sake of backwards compatibility.
this[kOldStatus] = -1;
filename = getValidatedPath(filename, 'filename');
validateUint32(interval, 'interval');
const err = this._handle.start(toNamespacedPath(filename), interval);
if (err) {
const error = uvException({
errno: err,
syscall: 'watch',
path: filename
});
error.filename = filename;
throw error;
}
};
// To maximize backward-compatibility for the end user,
// a no-op stub method has been added instead of
// totally removing StatWatcher.prototype.start.
// This should not be documented.
StatWatcher.prototype.start = () => {};
// FIXME(joyeecheung): this method is not documented while there is
// another documented fs.unwatchFile(). The counterpart in
// FSWatcher is .close()
// This method is a noop if the watcher has not been started.
StatWatcher.prototype.stop = function() {
if (this._handle === null)
return;
defaultTriggerAsyncIdScope(this._handle.getAsyncId(),
process.nextTick,
emitStop,
this);
this._handle.close();
this._handle = null;
};
// Clean up or add ref counters.
StatWatcher.prototype[kFSStatWatcherAddOrCleanRef] = function(operate) {
if (operate === 'add') {
// Add a Ref
this[KFSStatWatcherRefCount]++;
this[KFSStatWatcherMaxRefCount]++;
} else if (operate === 'clean') {
// Clean up a single
this[KFSStatWatcherMaxRefCount]--;
this.unref();
} else if (operate === 'cleanAll') {
// Clean up all
this[KFSStatWatcherMaxRefCount] = 0;
this[KFSStatWatcherRefCount] = 0;
this._handle?.unref();
}
};
StatWatcher.prototype.ref = function() {
// Avoid refCount calling ref multiple times causing unref to have no effect.
if (this[KFSStatWatcherRefCount] === this[KFSStatWatcherMaxRefCount])
return this;
if (this._handle && this[KFSStatWatcherRefCount]++ === 0)
this._handle.ref();
return this;
};
StatWatcher.prototype.unref = function() {
// Avoid refCount calling unref multiple times causing ref to have no effect.
if (this[KFSStatWatcherRefCount] === 0) return this;
if (this._handle && --this[KFSStatWatcherRefCount] === 0)
this._handle.unref();
return this;
};
function FSWatcher() {
FunctionPrototypeCall(EventEmitter, this);
this._handle = new FSEvent();
this._handle[owner_symbol] = this;
this._handle.onchange = (status, eventType, filename) => {
// TODO(joyeecheung): we may check self._handle.initialized here
// and return if that is false. This allows us to avoid firing the event
// after the handle is closed, and to fire both UV_RENAME and UV_CHANGE
// if they are set by libuv at the same time.
if (status < 0) {
if (this._handle !== null) {
// We don't use this.close() here to avoid firing the close event.
this._handle.close();
this._handle = null; // Make the handle garbage collectable.
}
const error = uvException({
errno: status,
syscall: 'watch',
path: filename
});
error.filename = filename;
this.emit('error', error);
} else {
this.emit('change', eventType, filename);
}
};
}
ObjectSetPrototypeOf(FSWatcher.prototype, EventEmitter.prototype);
ObjectSetPrototypeOf(FSWatcher, EventEmitter);
// At the moment if filename is undefined, we
// 1. Throw an Error if it's the first time Symbol('kFSWatchStart') is called
// 2. Return silently if Symbol('kFSWatchStart') has already been called
// on a valid filename and the wrap has been initialized
// 3. Return silently if the watcher has already been closed
// This method is a noop if the watcher has already been started.
FSWatcher.prototype[kFSWatchStart] = function(filename,
persistent,
recursive,
encoding) {
if (this._handle === null) { // closed
return;
}
assert(this._handle instanceof FSEvent, 'handle must be a FSEvent');
if (this._handle.initialized) { // already started
return;
}
filename = getValidatedPath(filename, 'filename');
const err = this._handle.start(toNamespacedPath(filename),
persistent,
recursive,
encoding);
if (err) {
const error = uvException({
errno: err,
syscall: 'watch',
path: filename,
message: err === UV_ENOSPC ?
'System limit for number of file watchers reached' : ''
});
error.filename = filename;
throw error;
}
};
// To maximize backward-compatibility for the end user,
// a no-op stub method has been added instead of
// totally removing FSWatcher.prototype.start.
// This should not be documented.
FSWatcher.prototype.start = () => {};
// This method is a noop if the watcher has not been started or
// has already been closed.
FSWatcher.prototype.close = function() {
if (this._handle === null) { // closed
return;
}
assert(this._handle instanceof FSEvent, 'handle must be a FSEvent');
if (!this._handle.initialized) { // not started
return;
}
this._handle.close();
this._handle = null; // Make the handle garbage collectable.
process.nextTick(emitCloseNT, this);
};
FSWatcher.prototype.ref = function() {
if (this._handle) this._handle.ref();
return this;
};
FSWatcher.prototype.unref = function() {
if (this._handle) this._handle.unref();
return this;
};
function emitCloseNT(self) {
self.emit('close');
}
// Legacy alias on the C++ wrapper object. This is not public API, so we may
// want to runtime-deprecate it at some point. There's no hurry, though.
ObjectDefineProperty(FSEvent.prototype, 'owner', {
__proto__: null,
get() { return this[owner_symbol]; },
set(v) { return this[owner_symbol] = v; }
});
async function* watch(filename, options = {}) {
const path = toNamespacedPath(getValidatedPath(filename));
validateObject(options, 'options');
const {
persistent = true,
recursive = false,
encoding = 'utf8',
signal,
} = options;
validateBoolean(persistent, 'options.persistent');
validateBoolean(recursive, 'options.recursive');
validateAbortSignal(signal, 'options.signal');
if (encoding && !isEncoding(encoding)) {
const reason = 'is invalid encoding';
throw new ERR_INVALID_ARG_VALUE(encoding, 'encoding', reason);
}
if (signal?.aborted)
throw new AbortError(undefined, { cause: signal?.reason });
const handle = new FSEvent();
let { promise, resolve, reject } = createDeferredPromise();
const oncancel = () => {
handle.close();
reject(new AbortError(undefined, { cause: signal?.reason }));
};
try {
signal?.addEventListener('abort', oncancel, { once: true });
handle.onchange = (status, eventType, filename) => {
if (status < 0) {
const error = uvException({
errno: status,
syscall: 'watch',
path: filename
});
error.filename = filename;
handle.close();
reject(error);
return;
}
resolve({ eventType, filename });
};
const err = handle.start(path, persistent, recursive, encoding);
if (err) {
const error = uvException({
errno: err,
syscall: 'watch',
path: filename,
message: err === UV_ENOSPC ?
'System limit for number of file watchers reached' : ''
});
error.filename = filename;
handle.close();
throw error;
}
while (!signal?.aborted) {
yield await promise;
({ promise, resolve, reject } = createDeferredPromise());
}
throw new AbortError(undefined, { cause: signal?.reason });
} finally {
handle.close();
signal?.removeEventListener('abort', oncancel);
}
}
module.exports = {
FSWatcher,
StatWatcher,
kFSWatchStart,
kFSStatWatcherStart,
kFSStatWatcherAddOrCleanRef,
watch,
};
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