alive-sessions

Trigger a callback when a session expires and revalidate expire time of a session.

When a session expires, the callback is triggered and the session is removed from the store. Since the store is a javascript object the time complexity of the operations is O(1), which is good for handling many sessions.

This trigger callback can be used to remove a session from a database.

Getting started

Install this package using npm.

npm install alive-sessions

Esm

import * as aliveSessions from 'alive-sessions'
-or-
import { createSession } from 'alive-sessions'

CommonJS

const aliveSessions = require('alive-sessions')
-or-
const { createSession } = require('aliveSessions')

API

Constraint	Constraint meaning
REQ	Required
OPT	Optional
DEF=X	Default value is X

⚙️ Create a new session

Creating a new session will insert a new session in the store and start the expire timer. When the session expires the callback will be triggered.

createSession({
  sessionID: 'you-session-id', 
  expireMs: 300000, 
  data: any,
  action: () => console.log('Session expired')
})

Params: REQ sessionID: The session id. It can be any string. DEF=5min expireMs: The session expire time in milliseconds. REQ action: The callback to be triggered when the session expires. DEF=null data: Any data to be passed to the callback.

Returns: Undefined if the session was created successfully or throws an error if something went wrong.

⚙️ Revalidate a session

Revalidating a session will update the expire time of the session and prevent the session from expiring.

revalidateSession(sessionID, expireMs)

Params: REQ sessionID: The session id. It can be any string. REQ expireMs: The session expire time in milliseconds.

Returns: Undefined if the session was revalidated successfully or throws an error if something went wrong.

⚙️ Check for a session

Check if a session exists in the store and prevent duplicate sessions.

sessionExists(sessionID)

Params: REQ sessionID: The session id. It can be any string.

Returns: True if the session exists or False if the session does not exist.

⚙️ Remove a session

Remove a session from the store before it expires.

removeSession(sessionID)

Params: REQ sessionID: The session id. It can be any string.

Returns: Undefined if the session was removed successfully or throws an error if something went wrong.

⚙️ Get a session data

Given a session id, get the data associated with the session.

getSessionData(sessionID)

Params: REQ sessionID: The session id. It can be any string.

Returns: The session value (any) or throws an error if something went wrong. The default session value is null.

⚙️ Sessions

Get all sessions from the store for testing purposes. Modifying the store directly is not recommended and may result in unexpected errors.

sessions()

Params: N/A

Returns: An object with all the sessions in the store.

⚙️ Conversions

alive-sessions package also provides helper functions to convert minutes and seconds to milliseconds.

secondsToMs(seconds)
minutesToMs(minutes)

Params: REQ seconds/minutes: The number of the unit on each case.

Returns: The number of milliseconds.