aedes-persistence-mongodb
v9.1.1
Published
MongoDB persistence for Aedes
Downloads
7,262
Readme
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 urlmongoOptions
: Extra options to pass to MongoDB driver (see node-mongodb-native)ttl
: Used to set a ttl (time to live) to documents stored in collectionspackets
: 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 nourl
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