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'use strict'
const EE = require('events').EventEmitter
const cons = require('constants')
const fs = require('fs')
module.exports = (f, options, cb) => {
if (typeof options === 'function')
cb = options, options = {}
const p = new Promise((res, rej) => {
new Touch(validOpts(options, f, null))
.on('done', res).on('error', rej)
})
return cb ? p.then(res => cb(null, res), cb) : p
}
module.exports.sync = module.exports.touchSync = (f, options) =>
(new TouchSync(validOpts(options, f, null)), undefined)
module.exports.ftouch = (fd, options, cb) => {
if (typeof options === 'function')
cb = options, options = {}
const p = new Promise((res, rej) => {
new Touch(validOpts(options, null, fd))
.on('done', res).on('error', rej)
})
return cb ? p.then(res => cb(null, res), cb) : p
}
module.exports.ftouchSync = (fd, opt) =>
(new TouchSync(validOpts(opt, null, fd)), undefined)
const validOpts = (options, path, fd) => {
options = Object.create(options || {})
options.fd = fd
options.path = path
// {mtime: true}, {ctime: true}
// If set to something else, then treat as epoch ms value
const now = new Date(options.time || Date.now()).getTime() / 1000
if (!options.atime && !options.mtime)
options.atime = options.mtime = now
else {
if (true === options.atime)
options.atime = now
if (true === options.mtime)
options.mtime = now
}
let oflags = 0
if (!options.force)
oflags = oflags | cons.O_RDWR
if (!options.nocreate)
oflags = oflags | cons.O_CREAT
options.oflags = oflags
return options
}
class Touch extends EE {
constructor (options) {
super(options)
this.fd = options.fd
this.path = options.path
this.atime = options.atime
this.mtime = options.mtime
this.ref = options.ref
this.nocreate = !!options.nocreate
this.force = !!options.force
this.closeAfter = options.closeAfter
this.oflags = options.oflags
this.options = options
if (typeof this.fd !== 'number') {
this.closeAfter = true
this.open()
} else
this.onopen(null, this.fd)
}
emit (ev, data) {
// we only emit when either done or erroring
// in both cases, need to close
this.close()
return super.emit(ev, data)
}
close () {
if (typeof this.fd === 'number' && this.closeAfter)
fs.close(this.fd, () => {})
}
open () {
fs.open(this.path, this.oflags, (er, fd) => this.onopen(er, fd))
}
onopen (er, fd) {
if (er) {
if (er.code === 'EISDIR')
this.onopen(null, null)
else if (er.code === 'ENOENT' && this.nocreate)
this.emit('done')
else
this.emit('error', er)
} else {
this.fd = fd
if (this.ref)
this.statref()
else if (!this.atime || !this.mtime)
this.fstat()
else
this.futimes()
}
}
statref () {
fs.stat(this.ref, (er, st) => {
if (er)
this.emit('error', er)
else
this.onstatref(st)
})
}
onstatref (st) {
this.atime = this.atime && st.atime.getTime()/1000
this.mtime = this.mtime && st.mtime.getTime()/1000
if (!this.atime || !this.mtime)
this.fstat()
else
this.futimes()
}
fstat () {
const stat = this.fd ? 'fstat' : 'stat'
const target = this.fd || this.path
fs[stat](target, (er, st) => {
if (er)
this.emit('error', er)
else
this.onfstat(st)
})
}
onfstat (st) {
if (typeof this.atime !== 'number')
this.atime = st.atime.getTime()/1000
if (typeof this.mtime !== 'number')
this.mtime = st.mtime.getTime()/1000
this.futimes()
}
futimes () {
const utimes = this.fd ? 'futimes' : 'utimes'
const target = this.fd || this.path
fs[utimes](target, ''+this.atime, ''+this.mtime, er => {
if (er)
this.emit('error', er)
else
this.emit('done')
})
}
}
class TouchSync extends Touch {
open () {
try {
this.onopen(null, fs.openSync(this.path, this.oflags))
} catch (er) {
this.onopen(er)
}
}
statref () {
let threw = true
try {
this.onstatref(fs.statSync(this.ref))
threw = false
} finally {
if (threw)
this.close()
}
}
fstat () {
let threw = true
const stat = this.fd ? 'fstatSync' : 'statSync'
const target = this.fd || this.path
try {
this.onfstat(fs[stat](target))
threw = false
} finally {
if (threw)
this.close()
}
}
futimes () {
let threw = true
const utimes = this.fd ? 'futimesSync' : 'utimesSync'
const target = this.fd || this.path
try {
fs[utimes](target, this.atime, this.mtime)
threw = false
} finally {
if (threw)
this.close()
}
this.emit('done')
}
close () {
if (typeof this.fd === 'number' && this.closeAfter)
try { fs.closeSync(this.fd) } catch (er) {}
}
}
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