Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without
restriction, including without limitation the rights to use,
copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following
conditions:

The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.

Source

"use strict";

var AbstractPersistence = require("./abstract");
var mongo = require('mongodb');
var MongoClient = mongo.MongoClient;
var util = require("util");
var async = require("async");
var Matcher = require("./matcher");
var topicPatterns = require("./utils").topicPatterns;
var extend = require("extend");
var defaults = {
  ttl: {
    // TTL for subscriptions is 1 hour
    subscriptions: 60 * 60 * 1000,

    // TTL for packets is 1 hour
    packets: 60 * 60 * 1000,
  },
  mongo: {}
};

MongoPersistence

function
MongoPersistence()

@param: {Object}optionsThe options, as describe above.
@param: {Function}doneThe callback that will be called
@: when the persistance is ready

Description

A persistance based on MongoDB.
It currently performs in save mode.

The current options include:
- url, the connection URL of the database
- ttl, an object containing three values:
* subscriptions, the time (ms) after which subscriptions
will expire. It defaults to 1 hour.
* packets, the time (ms) after which packets will expire.
It defaults to 1 hour.
- mongo, all the options for the MongoDB driver.
- connection, a MongoDB client to be reused

Source

function MongoPersistence(options, done) {
  if (!(this instanceof MongoPersistence)) {
    return new MongoPersistence(options, done);
  }


  this.options = extend(true, {}, defaults, options);
  this.options.mongo.safe = true;

  var that = this;

  var connected = function(err, db) {
    if (err) {
      if (done) {
        return done(err);
      }
      // we have no way of providing an error handler
      throw err;
    }

    that.db = db;
    async.parallel([
      function(cb) {
        db.collection("subscriptions", function(err, coll) {
          that._subscriptions = coll;
          async.parallel([
            that._subscriptions.ensureIndex.bind(that._subscriptions, "client"),
            that._subscriptions.ensureIndex.bind(that._subscriptions, { "added": 1 }, { expireAfterSeconds: Math.round(that.options.ttl.subscriptions / 1000 )} )
          ], cb);
        });
      },
      function(cb) {
        db.collection("packets", function(err, coll) {
          that._packets = coll;
          that._packets.ensureIndex("client", cb);
        });
      },
      function(cb) {
        db.collection("retained", function(err, coll) {
          that._retained = coll;
          that._retained.ensureIndex("topic", { unique: true }, cb);
        });
      }
    ], function(err) {
      if (done) {
        done(err, that);
      }
    });
  };

  // Connect to the db
  if (options.connection) {
    connected(null, this.options.connection);
  } else {
    MongoClient.connect(this.options.url, this.options.mongo, connected);
  }
}

util.inherits(MongoPersistence, AbstractPersistence);

exports

property
module.exports

Description

Export it as a module

Source

module.exports = MongoPersistence;

Mosca lib/persistence/mongo.js