增加晶全app静态页面

node_modules/mqtt/lib/store.js

@@ -0,0 +1,140 @@
+'use strict'
+
+/**
+ * Module dependencies
+ */
+var xtend = require('xtend')
+
+var Readable = require('readable-stream').Readable
+var streamsOpts = { objectMode: true }
+var defaultStoreOptions = {
+  clean: true
+}
+
+/**
+ * es6-map can preserve insertion order even if ES version is older.
+ *
+ * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map#Description
+ * It should be noted that a Map which is a map of an object, especially
+ * a dictionary of dictionaries, will only map to the object's insertion
+ * order. In ES2015 this is ordered for objects but for older versions of
+ * ES, this may be random and not ordered.
+ *
+ */
+var Map = require('es6-map')
+
+/**
+ * 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 () {
+  var stream = new Readable(streamsOpts)
+  var destroyed = false
+  var values = []
+  var 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
+    }
+
+    var self = this
+
+    destroyed = true
+
+    process.nextTick(function () {
+      self.emit('close')
+    })
+  }
+
+  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