'use strict'
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/**
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* Module dependencies
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*/
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var xtend = require('xtend')
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var Readable = require('readable-stream').Readable
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var streamsOpts = { objectMode: true }
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var defaultStoreOptions = {
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clean: true
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}
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/**
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* es6-map can preserve insertion order even if ES version is older.
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*
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* https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map#Description
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* It should be noted that a Map which is a map of an object, especially
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* a dictionary of dictionaries, will only map to the object's insertion
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* order. In ES2015 this is ordered for objects but for older versions of
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* ES, this may be random and not ordered.
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*
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*/
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var Map = require('es6-map')
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/**
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* In-memory implementation of the message store
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* This can actually be saved into files.
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*
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* @param {Object} [options] - store options
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*/
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function Store (options) {
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if (!(this instanceof Store)) {
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return new Store(options)
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}
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this.options = options || {}
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// Defaults
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this.options = xtend(defaultStoreOptions, options)
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this._inflights = new Map()
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}
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/**
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* Adds a packet to the store, a packet is
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* anything that has a messageId property.
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*
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*/
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Store.prototype.put = function (packet, cb) {
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this._inflights.set(packet.messageId, packet)
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if (cb) {
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cb()
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}
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return this
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}
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/**
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* Creates a stream with all the packets in the store
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*
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*/
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Store.prototype.createStream = function () {
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var stream = new Readable(streamsOpts)
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var destroyed = false
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var values = []
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var i = 0
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this._inflights.forEach(function (value, key) {
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values.push(value)
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})
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stream._read = function () {
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if (!destroyed && i < values.length) {
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this.push(values[i++])
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} else {
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this.push(null)
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}
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}
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stream.destroy = function () {
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if (destroyed) {
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return
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}
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var self = this
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destroyed = true
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process.nextTick(function () {
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self.emit('close')
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})
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}
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return stream
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}
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/**
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* deletes a packet from the store.
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*/
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Store.prototype.del = function (packet, cb) {
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packet = this._inflights.get(packet.messageId)
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if (packet) {
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this._inflights.delete(packet.messageId)
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cb(null, packet)
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} else if (cb) {
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cb(new Error('missing packet'))
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}
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return this
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}
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/**
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* get a packet from the store.
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*/
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Store.prototype.get = function (packet, cb) {
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packet = this._inflights.get(packet.messageId)
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if (packet) {
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cb(null, packet)
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} else if (cb) {
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cb(new Error('missing packet'))
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}
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return this
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}
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/**
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* Close the store
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*/
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Store.prototype.close = function (cb) {
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if (this.options.clean) {
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this._inflights = null
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}
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if (cb) {
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cb()
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}
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}
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module.exports = Store
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