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'use strict';
const errors = require('internal/errors');
const {
kFsStatsFieldsLength,
StatWatcher: _StatWatcher
} = process.binding('fs');
const { FSEvent } = process.binding('fs_event_wrap');
const { EventEmitter } = require('events');
const {
getStatsFromBinding,
validatePath
} = require('internal/fs/utils');
const { toNamespacedPath } = require('path');
const { validateUint32 } = require('internal/validators');
const { getPathFromURL } = require('internal/url');
const util = require('util');
const assert = require('assert');
function emitStop(self) {
self.emit('stop');
}
function StatWatcher() {
EventEmitter.call(this);
this._handle = new _StatWatcher();
// uv_fs_poll is a little more powerful than ev_stat but we curb it for
// the sake of backwards compatibility
let oldStatus = -1;
this._handle.onchange = (newStatus, stats) => {
if (oldStatus === -1 &&
newStatus === -1 &&
stats[2/* new nlink */] === stats[16/* old nlink */]) return;
oldStatus = newStatus;
this.emit('change', getStatsFromBinding(stats),
getStatsFromBinding(stats, kFsStatsFieldsLength));
};
this._handle.onstop = () => {
process.nextTick(emitStop, this);
};
}
util.inherits(StatWatcher, EventEmitter);
// FIXME(joyeecheung): this method is not documented.
// At the moment if filename is undefined, we
// 1. Throw an Error if it's the first time .start() is called
// 2. Return silently if .start() 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.start = function(filename, persistent, interval) {
assert(this._handle instanceof _StatWatcher, 'handle must be a StatWatcher');
if (this._handle.isActive) {
return;
}
filename = getPathFromURL(filename);
validatePath(filename, 'filename');
validateUint32(interval, 'interval');
const err = this._handle.start(toNamespacedPath(filename),
persistent, interval);
if (err) {
const error = errors.uvException({
errno: err,
syscall: 'watch',
path: filename
});
error.filename = filename;
throw error;
}
};
// 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() {
assert(this._handle instanceof _StatWatcher, 'handle must be a StatWatcher');
if (!this._handle.isActive) {
return;
}
this._handle.stop();
};
function FSWatcher() {
EventEmitter.call(this);
this._handle = new FSEvent();
this._handle.owner = 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) {
this._handle.close();
const error = errors.uvException({
errno: status,
syscall: 'watch',
path: filename
});
error.filename = filename;
this.emit('error', error);
} else {
this.emit('change', eventType, filename);
}
};
}
util.inherits(FSWatcher, EventEmitter);
// FIXME(joyeecheung): this method is not documented.
// At the moment if filename is undefined, we
// 1. Throw an Error if it's the first time .start() is called
// 2. Return silently if .start() 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.
FSWatcher.prototype.start = function(filename,
persistent,
recursive,
encoding) {
assert(this._handle instanceof FSEvent, 'handle must be a FSEvent');
if (this._handle.initialized) {
return;
}
filename = getPathFromURL(filename);
validatePath(filename, 'filename');
const err = this._handle.start(toNamespacedPath(filename),
persistent,
recursive,
encoding);
if (err) {
const error = errors.uvException({
errno: err,
syscall: 'watch',
path: filename
});
error.filename = filename;
throw error;
}
};
// This method is a noop if the watcher has not been started.
FSWatcher.prototype.close = function() {
assert(this._handle instanceof FSEvent, 'handle must be a FSEvent');
if (!this._handle.initialized) {
return;
}
this._handle.close();
process.nextTick(emitCloseNT, this);
};
function emitCloseNT(self) {
self.emit('close');
}
module.exports = {
FSWatcher,
StatWatcher
};
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