aedes-persistence-mongodb

Aedes persistence, backed by MongoDB.

See aedes-persistence for the full API, and Aedes for usage.

Install

npm i aedes aedes-persistence-mongodb --save

API

aedesPersistenceMongoDB([opts])

Creates a new instance of aedes-persistence-mongodb. It accepts a connections string url or you can pass your existing db object. Also, you can choose to set a ttl (time to live) for your subscribers or packets. This option will help you to empty your db from keeping useless data.

Options

• url: The MongoDB connection url
• mongoOptions: Extra options to pass to MongoDB driver (see node-mongodb-native)
• ttl: Used to set a ttl (time to live) to documents stored in collections
  • packets: Could be an integer value that specify the ttl in seconds of all packets collections or an Object that specifies for each collection its ttl in seconds. Packets collections are: incoming, outgoing, retained, will.
  • susbscriptions: Set a ttl (in seconds)
• db: Existing MongoDB instance (if no url option is specified)
• dropExistingIndexes: Flag used to drop any existing index previously created on collections (except default index _id)
• ttlAfterDisconnected: Flag used to enable alternative behavior of the subscription ttl, the subscription will expire based on time since client last disconnected from the broker instead of time since the subscription was created.

When changing ttl durations or switching on/off ttlAfterDisconnected on an existing database, dropExistingIndexes needs to be set to true for ttl indexes to be updated.

Examples

aedesPersistenceMongoDB({
  url: 'mongodb://127.0.0.1/aedes-test', // Optional when you pass db object
  // Optional mongo options
  mongoOptions: { 
    auth: {
      user: 'username',
      password: 'password'
    }
  },
  // Optional ttl settings
  ttl: {
      packets: 300, // Number of seconds
      subscriptions: 300,
  }
})

With the previous configuration all packets will have a ttl of 300 seconds. You can also provide different ttl settings for each collection:

ttl: {
      packets: {
        incoming: 100,
        outgoing: 100,
        will: 300,
        retained: -1
      }, // Number of seconds
      subscriptions: 300,
}

If you want a specific collection to be persistent just set a ttl of -1 or null or undefined.

If you want to reuse an existing MongoDb instance just set the db option:

aedesPersistenceMongoDB({
 db:db
})

With mongoose:

aedesPersistenceMongoDB({
 db: mongoose.connection.useDb('myDbName').db
})

License

MIT