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|
path = require('path')
fs = require('fs')
events = require('events')
writeSync = require('write-file-atomic').sync
KEY_FOR_EMPTY_STRING = '---.EMPTY_STRING.---' # Chose something that no one is likely to ever use
_emptyDirectory = (target) ->
_rm(path.join(target, p)) for p in fs.readdirSync(target)
_rm = (target) ->
if fs.statSync(target).isDirectory()
_emptyDirectory(target)
fs.rmdirSync(target)
else
fs.unlinkSync(target)
_escapeKey = (key) ->
if key is ''
newKey = KEY_FOR_EMPTY_STRING
else
newKey = key.toString()
return newKey
class QUOTA_EXCEEDED_ERR extends Error
constructor: (@message = 'Unknown error.') ->
if Error.captureStackTrace?
Error.captureStackTrace(this, @constructor)
@name = @constructor.name
toString: () ->
return "#{@name}: #{@message}"
class StorageEvent
constructor: (@key, @oldValue, @newValue, @url, @storageArea = 'localStorage') ->
class MetaKey # MetaKey contains key and size
constructor: (@key, @index) ->
unless this instanceof MetaKey
return new MetaKey(@key, @index)
createMap = -> # createMap contains Metakeys as properties
Map = ->
return
Map.prototype = Object.create(null);
return new Map()
class LocalStorage extends events.EventEmitter
instanceMap = {}
constructor: (@_location, @quota = 5 * 1024 * 1024) ->
unless this instanceof LocalStorage
return new LocalStorage(@_location, @quota)
@_location = path.resolve(@_location)
if instanceMap[@_location]?
return instanceMap[@_location]
@length = 0 # !TODO: Maybe change this to a property with __defineProperty__
@_bytesInUse = 0
@_keys = []
@_metaKeyMap = createMap()
@_eventUrl = "pid:" + process.pid
@_init()
@_QUOTA_EXCEEDED_ERR = QUOTA_EXCEEDED_ERR
# if Proxy?
# handler =
# set: (receiver, key, value) =>
# if @[key]?
# return @[key] = value
# else
# @setItem(key, value)
#
# get: (receiver, key) =>
# if @[key]?
# return @[key]
# else
# return @getItem(key)
#
# instanceMap[@_location] = Proxy.create(handler, this)
# return instanceMap[@_location]
instanceMap[@_location] = this
return instanceMap[@_location]
# else it'll return this
_init: () ->
try
stat = fs.statSync(@_location)
if stat? and not stat.isDirectory()
throw new Error("A file exists at the location '#{@_location}' when trying to create/open localStorage")
# At this point, it exists and is definitely a directory. So read it.
@_bytesInUse = 0
@length = 0
_keys = fs.readdirSync(@_location)
for k, index in _keys
_decodedKey = decodeURIComponent(k)
@_keys.push(_decodedKey)
_MetaKey = new MetaKey(k, index)
@_metaKeyMap[_decodedKey] = _MetaKey
stat = @_getStat(k)
if stat?.size?
_MetaKey.size = stat.size
@_bytesInUse += stat.size
@length = _keys.length
return
catch
# If it errors, that means it didn't exist, so create it
fs.mkdirSync(@_location)
return
setItem: (key, value) ->
hasListeners = events.EventEmitter.listenerCount(this, 'storage')
oldValue = null
if hasListeners
oldValue = this.getItem(key)
key = _escapeKey(key)
encodedKey = encodeURIComponent(key)
filename = path.join(@_location, encodedKey)
valueString = value.toString()
valueStringLength = valueString.length
metaKey = @_metaKeyMap[key]
existsBeforeSet = !!metaKey
if existsBeforeSet
oldLength = metaKey.size
else
oldLength = 0
if @_bytesInUse - oldLength + valueStringLength > @quota
throw new QUOTA_EXCEEDED_ERR()
writeSync(filename, valueString, 'utf8')
unless existsBeforeSet
metaKey = new MetaKey(encodedKey, (@_keys.push(key)) - 1)
metaKey.size = valueStringLength
@_metaKeyMap[key] = metaKey
@length += 1
@_bytesInUse += valueStringLength
if hasListeners
evnt = new StorageEvent(key, oldValue, value, @_eventUrl)
this.emit('storage', evnt)
getItem: (key) ->
key = _escapeKey(key)
metaKey = @_metaKeyMap[key]
if !!metaKey
filename = path.join(@_location, metaKey.key)
return fs.readFileSync(filename, 'utf8')
else
return null
_getStat: (key) ->
key = _escapeKey(key)
filename = path.join(@_location, encodeURIComponent(key))
try
return fs.statSync(filename)
catch
return null
removeItem: (key) ->
key = _escapeKey(key)
metaKey = @_metaKeyMap[key]
if (!!metaKey)
hasListeners = events.EventEmitter.listenerCount(this, 'storage')
oldValue = null
if hasListeners
oldValue = this.getItem(key)
delete @_metaKeyMap[key]
@length -= 1
@_bytesInUse -= metaKey.size
filename = path.join(@_location, metaKey.key)
@_keys.splice(metaKey.index,1)
for k,v of @_metaKeyMap
meta = @_metaKeyMap[k]
if meta.index > metaKey.index
meta.index -= 1
_rm(filename)
if hasListeners
evnt = new StorageEvent(key, oldValue, null, @_eventUrl)
this.emit('storage', evnt)
key: (n) ->
return @_keys[n]
clear: () ->
_emptyDirectory(@_location)
@_metaKeyMap = createMap()
@_keys = []
@length = 0
@_bytesInUse = 0
if events.EventEmitter.listenerCount(this, 'storage')
evnt = new StorageEvent(null, null, null, @_eventUrl)
this.emit('storage', evnt)
_getBytesInUse: () ->
return @_bytesInUse
_deleteLocation: () ->
delete instanceMap[@_location]
_rm(@_location)
@_metaKeyMap = {}
@_keys = []
@length = 0
@_bytesInUse = 0
class JSONStorage extends LocalStorage
setItem: (key, value) ->
newValue = JSON.stringify(value)
super(key, newValue)
getItem: (key) ->
return JSON.parse(super(key))
exports.LocalStorage = LocalStorage
exports.JSONStorage = JSONStorage
exports.QUOTA_EXCEEDED_ERR = QUOTA_EXCEEDED_ERR
|
