/
index.js
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/
index.js
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var util = require('util')
var stringify = require('json-stringify-safe')
var lengthKey = '__length__'
module.exports = function (session) {
var Store = session.Store
function LevelSessionStore (db, opts) {
db = db || 'level-session-store'
opts = opts || {}
Store.call(this, opts)
this.mungeKey = false
this.storeName = opts.ns || '_session'
if (typeof db === 'string') {
this._createDB(db, opts)
} else {
this.mungeKey = true
this.db = db
}
}
util.inherits(LevelSessionStore, Store)
LevelSessionStore.prototype._createDB = function (name, opts) {
opts = opts || {}
var self = this
try {
var level = require('level')
} catch (err) {
throw new Error('If you are not passing in an existing level instance, you must have the package level installed. ' + err.message)
}
this.db = level(name, opts, function (err, db) {
if (err) {
throw err
}
var key = self.getKey(lengthKey)
db.get(key, function (err, length) {
if (err && err.type !== 'NotFoundError') return self.emit('error', err)
length = parseInt(length, 10) || 0
db.put(key, length)
self.emit('connect')
})
})
}
LevelSessionStore.prototype.getKey = function (key) {
if (this.mungeKey) {
return [this.storeName, key].join('/')
}
return key
}
LevelSessionStore.prototype.get = function (sid, cb) {
this.db.get(this.getKey(sid), function (err, data) {
if (err && err.type !== 'NotFoundError') {
return cb(err)
}
var session
if (data) {
try {
session = JSON.parse(data)
} catch (err) {
return cb(err)
}
}
cb(null, session)
})
}
LevelSessionStore.prototype.set = function (sid, session, cb) {
var self = this
session = stringify(session)
this.db.get(this.getKey(lengthKey), function (err, len) {
if (err) return cb(err)
len = parseInt(len, 10) || 0
var ops = [
{type: 'put', key: self.getKey(sid), value: session},
{type: 'put', key: self.getKey(lengthKey), value: ++len}
]
self.db.batch(ops, cb)
})
}
LevelSessionStore.prototype.destroy = function (sid, cb) {
var self = this
this.db.get(this.getKey(lengthKey), function (err, len) {
if (err) return cb(err)
len = parseInt(len, 10) || 0
var ops = [
{type: 'del', key: self.getKey(sid), value: session},
{type: 'put', key: self.getKey(lengthKey), value: --len}
]
self.db.batch(ops, cb)
})
}
LevelSessionStore.prototype.touch = function (sid, session, cb) {
session = stringify(session)
this.db.put(this.getKey(sid), session, function (err) {
cb && cb(err)
})
}
LevelSessionStore.prototype.length = function (cb) {
this.db.get(this.getKey(lengthKey), function (err, len) {
return cb(err, parseInt(len, 10) || 0)
})
}
LevelSessionStore.prototype.clear = function (cb) {
var self = this
var total = 0
var count = 0
var streamDone = false
var done = function () {
++count
if (count === total && streamDone) {
cb && cb()
}
}
this.db.createKeyStream()
.on('data', function (key) {
if (self.mungeKey && key.indexOf(self.storeName) === 0) {
self.db.del(key, done)
}
})
.on('end', function () {
self.db.put(self.getKey(lengthKey), 0, function () {
streamDone = true
done()
})
})
}
return LevelSessionStore
}