BottleSessions 21.9.21

BottleSessions

BottleSessions is middleware providing web sessions for the Bottle micro web-framework.

The goal of BottleSessions is to provide easy to use and flexible to configure sessions. The defaults attempt to make sense for typical bottle web apps with little or no tuning.

BottleSessions is simple for the programmer to use in both middleware and route views. The Session is a superclass of a Python dict, accessible as an attribute added to the bottle request object as request.session. No special sauce is required to acquire or use the session.

Using the session

As an extension to dict the session is pythonic and is used like any other dict:

    user = request.session.get('user','Anonymous)
    ...
    request.session.update({
            'groups':['sysadmin','employee'], 
            'ip': request.ip
        })
    request.session['timestamp'] = time.now()

More details on using the BottleSessions.Session class are available.

Installation

Install from pypi:

pip install BottleSessions

BottleSessions Example

#app.py:

from BottleSessions import BottleSessions
from bottle import Bottle, request

app = Bottle()
btl = BottleSessions(app)

@app.route('/set/<key>/<val>')
def set_sess(key,val=None):

    request.session[key] = val
    return {key: val}

@app.route('/get/<key>')
def get_sess(key=None):

    return {key: request.session.get(key,'does not exist')}

@app.route('/')
def hello():
    return 'hello world'

if __name__ == '__main__':
    app.run()
#app.py:

from BottleSessions import BottleSessions
from bottle import Bottle, request

app = Bottle()
btl = BottleSessions(app)

@app.route('/set/<key>/<val>')
def set_sess(key,val=None):

    request.session[key] = val
    return {key: val}

@app.route('/get/<key>')
def get_sess(key=None):

    return {key: request.session.get(key,'does not exist')}

@app.route('/')
def hello():
    return 'hello world'

if __name__ == '__main__':
    app.run()

Another sample app is available here

BottleSession Defaults and Tuning

BottleSessions default behavior provides a session/cookie life of 300 seconds after last update using a cookie named bottlecookie marked Secure and http-only with path=/. The sessions use the same lifetime and are stored in a memory based cachelib SimpleCache.

These defaults are useful for a range of micro-framework web apps Bottle is typically used for. However, different applications have differing session needs. Hence both cookies and sessions can be easily customized to suite a variety of uses.

Backing Store

The backing store is provided by Pallets Project cachelib library and uses SimpleCache as the default.

cachelib FileSystemCache, RedisCache, and Memcached classes are also supported and can be configured with class specific options:

# config.py - FileSystemCache configuration
cache_config = {
    'cache_type': 'FileSystem',
    'cache_dir' : './sess_dir',
    'threshold': 2000,
    # Additional configuration parameters
    # per cachelib docs
    }

# app.py initialization
    ...
from config import cache_config
btl = BottleSessions(app, session_backing=cache_config,
session_cookie='appcookie')

Further information is available on configuring session backing store for differing needs and differing cache types.