08-27-周三_17-09-29

node_modules/graceful-fs/graceful-fs.js

@@ -0,0 +1,158 @@
+// Monkey-patching the fs module.
+// It's ugly, but there is simply no other way to do this.
+var fs = module.exports = require('./fs.js')
+
+var assert = require('assert')
+
+// fix up some busted stuff, mostly on windows and old nodes
+require('./polyfills.js')
+
+var util = require('util')
+
+function noop () {}
+
+var debug = noop
+if (util.debuglog)
+  debug = util.debuglog('gfs')
+else if (/\bgfs\b/i.test(process.env.NODE_DEBUG || ''))
+  debug = function() {
+    var m = util.format.apply(util, arguments)
+    m = 'GFS: ' + m.split(/\n/).join('\nGFS: ')
+    console.error(m)
+  }
+
+if (/\bgfs\b/i.test(process.env.NODE_DEBUG || '')) {
+  process.on('exit', function() {
+    debug('fds', fds)
+    debug(queue)
+    assert.equal(queue.length, 0)
+  })
+}
+
+
+var originalOpen = fs.open
+fs.open = open
+
+function open(path, flags, mode, cb) {
+  if (typeof mode === "function") cb = mode, mode = null
+  if (typeof cb !== "function") cb = noop
+  new OpenReq(path, flags, mode, cb)
+}
+
+function OpenReq(path, flags, mode, cb) {
+  this.path = path
+  this.flags = flags
+  this.mode = mode
+  this.cb = cb
+  Req.call(this)
+}
+
+util.inherits(OpenReq, Req)
+
+OpenReq.prototype.process = function() {
+  originalOpen.call(fs, this.path, this.flags, this.mode, this.done)
+}
+
+var fds = {}
+OpenReq.prototype.done = function(er, fd) {
+  debug('open done', er, fd)
+  if (fd)
+    fds['fd' + fd] = this.path
+  Req.prototype.done.call(this, er, fd)
+}
+
+
+var originalReaddir = fs.readdir
+fs.readdir = readdir
+
+function readdir(path, cb) {
+  if (typeof cb !== "function") cb = noop
+  new ReaddirReq(path, cb)
+}
+
+function ReaddirReq(path, cb) {
+  this.path = path
+  this.cb = cb
+  Req.call(this)
+}
+
+util.inherits(ReaddirReq, Req)
+
+ReaddirReq.prototype.process = function() {
+  originalReaddir.call(fs, this.path, this.done)
+}
+
+ReaddirReq.prototype.done = function(er, files) {
+  if (files && files.sort)
+    files = files.sort()
+  Req.prototype.done.call(this, er, files)
+  onclose()
+}
+
+
+var originalClose = fs.close
+fs.close = close
+
+function close (fd, cb) {
+  debug('close', fd)
+  if (typeof cb !== "function") cb = noop
+  delete fds['fd' + fd]
+  originalClose.call(fs, fd, function(er) {
+    onclose()
+    cb(er)
+  })
+}
+
+
+var originalCloseSync = fs.closeSync
+fs.closeSync = closeSync
+
+function closeSync (fd) {
+  try {
+    return originalCloseSync(fd)
+  } finally {
+    onclose()
+  }
+}
+
+
+// Req class
+function Req () {
+  // start processing
+  this.done = this.done.bind(this)
+  this.failures = 0
+  this.process()
+}
+
+Req.prototype.done = function (er, result) {
+  var tryAgain = false
+  if (er) {
+    var code = er.code
+    var tryAgain = code === "EMFILE" || code === "ENFILE"
+    if (process.platform === "win32")
+      tryAgain = tryAgain || code === "OK"
+  }
+
+  if (tryAgain) {
+    this.failures ++
+    enqueue(this)
+  } else {
+    var cb = this.cb
+    cb(er, result)
+  }
+}
+
+var queue = []
+
+function enqueue(req) {
+  queue.push(req)
+  debug('enqueue %d %s', queue.length, req.constructor.name, req)
+}
+
+function onclose() {
+  var req = queue.shift()
+  if (req) {
+    debug('process', req.constructor.name, req)
+    req.process()
+  }
+}