all files / random-access-file/ index.js

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89.06% Branches 57/64
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99.05% Lines 104/105
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var inherits = require('util').inherits
var RandomAccess = require('random-access-storage')
var fs = require('fs')
var mkdirp = require('mkdirp')
var path = require('path')
var constants = fs.constants || require('constants')
 
var READONLY = constants.O_RDONLY
var READWRITE = constants.O_RDWR | constants.O_CREAT
 
module.exports = RandomAccessFile
 
function RandomAccessFile (filename, opts) {
  if (!(this instanceof RandomAccessFile)) return new RandomAccessFile(filename, opts)
  RandomAccess.call(this)
 
  if (!opts) opts = {}
  if (opts.directory) filename = path.join(opts.directory, filename)
 
  this.directory = opts.directory || null
  this.filename = filename
  this.fd = 0
 
  // makes random-access-storage open in writable mode first
  if (opts.writable || opts.truncate) this.preferReadonly = false
 
  this._length = opts.size || opts.length || 0
  this._truncate = !!opts.truncate || this._length > 0
  this._rmdir = !!opts.rmdir
}
 
inherits(RandomAccessFile, RandomAccess)
 
RandomAccessFile.prototype._open = function (req) {
  var self = this
 
  mkdirp(path.dirname(this.filename), ondir)
 
  function ondir (err) {
    Iif (err) return req.callback(err)
    open(self, READWRITE, req)
  }
}
 
RandomAccessFile.prototype._openReadonly = function (req) {
  open(this, READONLY, req)
}
 
RandomAccessFile.prototype._write = function (req) {
  var data = req.data
  var fd = this.fd
 
  fs.write(fd, data, 0, req.size, req.offset, onwrite)
 
  function onwrite (err, wrote) {
    Iif (err) return req.callback(err)
 
    req.size -= wrote
    req.offset += wrote
 
    Eif (!req.size) return req.callback(null)
    fs.write(fd, data, data.length - req.size, req.size, req.offset, onwrite)
  }
}
 
RandomAccessFile.prototype._read = function (req) {
  var data = req.data || Buffer.allocUnsafe(req.size)
  var fd = this.fd
 
  if (!req.size) return process.nextTick(readEmpty, req)
  fs.read(fd, data, 0, req.size, req.offset, onread)
 
  function onread (err, read) {
    Iif (err) return req.callback(err)
    if (!read) return req.callback(new Error('Could not satisfy length'))
 
    req.size -= read
    req.offset += read
 
    if (!req.size) return req.callback(null, data)
    fs.read(fd, data, data.length - req.size, req.size, req.offset, onread)
  }
}
 
RandomAccessFile.prototype._del = function (req) {
  var fd = this.fd
 
  fs.fstat(fd, onstat)
 
  function onstat (err, st) {
    Iif (err) return req.callback(err)
    if (req.offset + req.size < st.size) return req.callback(null)
    fs.ftruncate(fd, req.offset, ontruncate)
  }
 
  function ontruncate (err) {
    req.callback(err)
  }
}
 
RandomAccessFile.prototype._stat = function (req) {
  fs.fstat(this.fd, onstat)
 
  function onstat (err, st) {
    req.callback(err, st)
  }
}
 
RandomAccessFile.prototype._close = function (req) {
  var self = this
 
  fs.close(this.fd, onclose)
 
  function onclose (err) {
    Iif (err) return req.callback(err)
    self.fd = 0
    req.callback(null)
  }
}
 
RandomAccessFile.prototype._destroy = function (req) {
  var self = this
 
  var root = this.directory && path.resolve(path.join(this.directory, '.'))
  var dir = path.resolve(path.dirname(this.filename))
 
  fs.unlink(this.filename, onunlink)
 
  function onunlink (err) {
    if (!self._rmdir || !root || dir === root) return req.callback(err)
    fs.rmdir(dir, onrmdir)
  }
 
  function onrmdir (err) {
    dir = path.join(dir, '..')
    if (err || dir === root) return req.callback(null)
    fs.rmdir(dir, onrmdir)
  }
}
 
function open (self, mode, req) {
  fs.open(self.filename, mode, onopen)
 
  function onopen (err, fd) {
    if (err) return req.callback(err)
 
    var old = self.fd
    self.fd = fd
    if (!old) return oncloseoldfd(null)
 
    // if we are moving from readonly -> readwrite, close the old fd
    fs.close(old, oncloseoldfd)
  }
 
  function oncloseoldfd (err) {
    if (err) return onerrorafteropen(err)
    if (!self._truncate || mode === READONLY) return req.callback(null)
    fs.ftruncate(self.fd, self._length, ontruncate)
  }
 
  function ontruncate (err) {
    if (err) return onerrorafteropen(err)
    req.callback(null)
  }
 
  function onerrorafteropen (err) {
    fs.close(self.fd, function () {
      self.fd = 0
      req.callback(err)
    })
  }
}
 
function readEmpty (req) {
  req.callback(null, Buffer.alloc(0))
}