'use strict'
|
|
/**
|
* Module dependencies
|
*/
|
const xtend = require('xtend')
|
|
const Readable = require('readable-stream').Readable
|
const streamsOpts = { objectMode: true }
|
const defaultStoreOptions = {
|
clean: true
|
}
|
|
/**
|
* In-memory implementation of the message store
|
* This can actually be saved into files.
|
*
|
* @param {Object} [options] - store options
|
*/
|
function Store (options) {
|
if (!(this instanceof Store)) {
|
return new Store(options)
|
}
|
|
this.options = options || {}
|
|
// Defaults
|
this.options = xtend(defaultStoreOptions, options)
|
|
this._inflights = new Map()
|
}
|
|
/**
|
* Adds a packet to the store, a packet is
|
* anything that has a messageId property.
|
*
|
*/
|
Store.prototype.put = function (packet, cb) {
|
this._inflights.set(packet.messageId, packet)
|
|
if (cb) {
|
cb()
|
}
|
|
return this
|
}
|
|
/**
|
* Creates a stream with all the packets in the store
|
*
|
*/
|
Store.prototype.createStream = function () {
|
const stream = new Readable(streamsOpts)
|
const values = []
|
let destroyed = false
|
let i = 0
|
|
this._inflights.forEach(function (value, key) {
|
values.push(value)
|
})
|
|
stream._read = function () {
|
if (!destroyed && i < values.length) {
|
this.push(values[i++])
|
} else {
|
this.push(null)
|
}
|
}
|
|
stream.destroy = function () {
|
if (destroyed) {
|
return
|
}
|
|
const self = this
|
|
destroyed = true
|
|
setTimeout(function () {
|
self.emit('close')
|
}, 0)
|
}
|
|
return stream
|
}
|
|
/**
|
* deletes a packet from the store.
|
*/
|
Store.prototype.del = function (packet, cb) {
|
packet = this._inflights.get(packet.messageId)
|
if (packet) {
|
this._inflights.delete(packet.messageId)
|
cb(null, packet)
|
} else if (cb) {
|
cb(new Error('missing packet'))
|
}
|
|
return this
|
}
|
|
/**
|
* get a packet from the store.
|
*/
|
Store.prototype.get = function (packet, cb) {
|
packet = this._inflights.get(packet.messageId)
|
if (packet) {
|
cb(null, packet)
|
} else if (cb) {
|
cb(new Error('missing packet'))
|
}
|
|
return this
|
}
|
|
/**
|
* Close the store
|
*/
|
Store.prototype.close = function (cb) {
|
if (this.options.clean) {
|
this._inflights = null
|
}
|
if (cb) {
|
cb()
|
}
|
}
|
|
module.exports = Store
|
