deepstream.io-storage-postgres

Postgres Database connector for deepstream.io

This connector can be installed via the deepstream command line interface via

deepstream install storage postgres

and can be configured in the plugins storage section of deepstreams config.yml. Supported options are

plugins:
  storage:
    name: postgres
    options:
      user: some-user
      database: some-database
      password: some-password
      host: localhost
      port: 5432 #postgres default post
      schema: ds #schema defaults to ds. Will be created if it doesn't exist
      table:
        defaultName: default # default table name defaults to default
        prefix: ds_ # table prefix defaults to empty string, so no prefix
      max: 10 #concurrent connections
      idleTimeoutMillis: 30000 #timeout after which connection will be cut
      writeInterval: 200 #amout of milliseconds during which writes will be
      useJsonb: false #store values as searchable binary JSON (slower)
      buffered
      notifications:
        CREATE_TABLE: false #Get notified when tables are created
        DESTROY_TABLE: false #Get notified when tables are dropped
        INSERT: false # Get notified when records are created
        UPDATE: false # Get notified when records are updated
        DELETE: false # Get notified when records are deleted

This connector can also be used as a standalone component from node.js to connect to postgres' notification mechanism. To do this, install the connector via

npm install deepstream.io-storage-postgres

and instantiate it directly

const PostgresConnector = require( 'deepstream.io-storage-postgres' );
const settings = {
  user: process.env.PG_USER,
  database: process.env.PG_DB,
  password: process.env.PG_PASSWORD,
  host: process.env.PG_HOST,
  port: parseInt( process.env.PG_PORT, 10 )
}

const connector = new PostgresConnector( settings )

connector.on( 'ready', ()=>{
    connector.subscribe( event =>{
        //event will be a map of event and table for CREATE_TABLE and DESTROY_TABLE
        // { event: 'CREATE_TABLE', table: 'some-table' })
        // or of event, table and key for INSERT, UPDATE AND DELETE, e.g.
        // { event: 'INSERT', table: 'some-table', key: 'some-key' }
    }, err => { if( err ) throw err; })

    //subscriptions can be removed
    connector.unsubscribe(( err )=>{ /* done */ })

    // the connector also comes with a facility to get a map of all tables and the numbers of items within
    connector.getSchemaOverview(( err, result ) => {
        /* result will be e.g.
        {
            'some-table': 2,
            'some-other-table': 1,
            'new-table': 1,
            'table-a': 2,
            'table-b': 2
        }
        */
    })
})