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#! /usr/bin/env python

## The author disclaims copyright to this source code.  In place of

## a legal notice, here is a poem:

##

##   "Metaphysics"

##   

##   Matter: is the music 

##   of the space.

##   Music: is the matter

##   of the soul.

##   

##   Soul: is the space

##   of God.

##   Space: is the soul

##   of logic.

##   

##   Logic: is the god

##   of the mind.

##   God: is the logic

##   of bliss.

##   

##   Bliss: is a mind

##   of music.

##   Mind: is the bliss

##   of the matter.

##   

######################################################################

## This file implements the garbage collection of stale sessions.

##

import sys, os, os.path, getopt, time

from cmbarter.settings import CMBARTER_SESSION_DIR





USAGE = """Usage: check_sessions.py [OPTIONS]

Delete old session files.



  -h, --help           display this help and exit

  --dir=DIRECTORY      give the session directory explicitly

  --prefix=PREFIX      specify the session file prefix (default: 'sessionid')

  --maxage=SECONDS     specify the maximum session age (default: 3600 seconds)



Example:

  $ ./check_sessions.py --maxage=10000

"""





def parse_args(argv):

    global prefix, directory, duration

    try:                                

        opts, args = getopt.gnu_getopt(argv, 'h', ['prefix=', 'dir=', 'maxage=', 'help'])

    except getopt.GetoptError:

        print(USAGE)

        sys.exit(2)



    if len(args) != 0:

        print(USAGE)

        sys.exit(2)



    for opt, arg in opts:

        if opt in ('-h', '--help'):

            print(USAGE)

            sys.exit()                  

        elif opt == '--prefix':

            prefix = arg

        elif opt == '--dir':

            directory = arg

        elif opt == '--maxage':

            try:

                duration = float(arg)

            except ValueError:

                print(USAGE)

                sys.exit()                  





if __name__ == "__main__":

    prefix = 'sessionid'

    directory = CMBARTER_SESSION_DIR

    duration = 3600.0

    parse_args(sys.argv[1:])

    currtime = time.time()



    for fname in os.listdir(directory):

        if fname.startswith(prefix):

            fabsname = os.path.join(directory, fname)

            try:

                mtime = os.path.getmtime(fabsname)

                if currtime - mtime > duration:

                    os.unlink(fabsname)

            except OSError:

                sys.exit()