Session-pouchdb-store NPM

session-pouchdb-store

Features

Compatible with PouchDB and CouchDB (or any database that uses the CouchDB API).
Realtime session data synchronization between processes (if PouchDB/CouchDB server is used)
Default in-memory PouchDB instance.
Custom PouchDB instance.
Scavenge and purge invalid/expired sessions.

Installation

npm install session-pouchdb-store --save

This will install session-pouchdb-store and add it to your application's package.json file.

Important Notes

If you use a remote PouchDB server, make sure the database exists prior to start your application/s

Basic Usage

Use with your express session middleware, like this:

const
	express = require("express"),
	session = require("express-session"),
	PouchSession = require("session-pouchdb-store");

let app = express();

app.use(session({
  secret: 'thisismysecret',
  resave: false,
  saveUninitialized: true,
	store : new PouchSession()
}));

app.listen(3000, () => {
	console.log(`Server ${process.pid} started on port 3000`);
});

By default, PouchSession creates an in-memory database for testing purposes. You can pass your own instance or connect to a remote PouchDB/CouchDB server:

Remote PouchDB server

app.use(session({
  secret: 'thisismysecret',
  resave: false,
  saveUninitialized: true,
	store : new PouchSession('http://pouchdbserver:port/sessions')
}));

Custom instance

const PouchDB = require('pouchdb');

let db = new PouchDB("sessions",{adapter:'leveldb'});
app.use(session({
  secret: 'thisismysecret',
  resave: false,
  saveUninitialized: true,
	store : new PouchSession(db)
}));

Realtime synchronization

In order to synchronize session data, the current version of the store requires a remote PouchDB server, so multiple express processes can connect to the same database and perform synchronization.

API

new PouchSession(pouchInstance, options)

Creates a new store instance. The first argument can be one of the following:

undefined If no arguments is passed, a default in-memory instance is created.
PouchDB instance The PouchDB instance that will be used by the store.
URL string A URL string to a remote PouchDB/CouchDB server.
string A simple string is used as a file path for leveldb storage

Options is an object that allows overriding some store behaviours:

maxIdle Max time in ms a session can go idle. When this time exceeds, the session is remove from the store cache. Note that a session can be idle and still be a valid session; session expiration is defined by the express-session module. The purpose of this parameter is to release from memory sessions that are not being used.
scavenge Interval time in ms that the store will search and release maxIdle sessions.
purge Interval time in ms that the the store will remove expired sessions from the database.

Default options are as follows:

Here is a list of all available options:

var options = {
	// Max idle time in ms
	maxIdle : 5*60*1000,
	// Scavenge period in ms
	scavenge : 1000,
	// Database purge period in ms					
	purge : 5*60*1000			
};