@deepstream/storage-postgres
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    3.0.4 • Public • Published

    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
          defaultTable: default # default table name defaults to default
          max: 10 #concurrent connections
          idleTimeoutMillis: 30000 #timeout after which connection will be cut
          writeInterval: 200 #amount of milliseconds during which writes will be buffered
          useJsonb: false #store values as searchable binary JSON (slower)
          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/storage-postgres
    

    and instantiate it directly

    const PostgresConnector = require( '@deepstream/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 )
    
    // start connector
    connector.init()
    
    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
            }
            */
        })
    })

    Migrating to the latest connector version

    The latest connector version (3.x) introduces breaking changes at database level for a cleaner data structure: one column for id, one for version, one for value.

    For migrating a current database from the v2 connector to v3 check out this script

    Installing the previous connector version

    npm i @deepstream/storage-postgres@2.0.1

    Deepstream v3 users

    For user of the deepstream server version 3.x, install the connector with npm install deepstreamIO/deepstream.io-storage-postgres#v1.1.5.

    Require as require( 'deepstream.io-storage-postgres' )

    Install

    npm i @deepstream/storage-postgres

    DownloadsWeekly Downloads

    0

    Version

    3.0.4

    License

    Apache-2.0

    Unpacked Size

    167 kB

    Total Files

    47

    Last publish

    Collaborators

    • jaime-ez
    • yasserf
    • valentinvichnal