A webserver to scramble a Rubik's cube.

cubing.py

#! /usr/bin/env python

"""
A webserver to scramble a Rubik's cube.
It renders a sequence of moves which you should perform to scramble your cube.
The generated scrambles are perfectly, uniformly random.
"""

import sys
import logging
import tornado.ioloop
import tornado.web
from tornado.httpclient import HTTPClient

class LoggerWriter:
    """ Wraps a logger with a file-like API. """
    def __init__(self, logger, level):
        self.logger = logger
        self.level = level

    def write(self, message):
        if message != '\n':
            self.logger.log(self.level, message)

logfile_path = 'cubing_logfile.log'

img_url = 'http://www.geocities.jp/fjtkt/misc/2006_0007/rotateimage/%s.png'

scramble_url = 'http://voltara.org/cube/scramble.php'

def render_moves(move_seq_str):
    to_ret = ''
    to_ret += '/moves/%s<br/><br/>\n' % move_seq_str
    move_seq = [move.upper().replace("'", 'd') for move in move_seq_str.split()]
    for move in move_seq:
        to_ret += '<img src="%s" style="margin:5px">' % (img_url % move)
    return to_ret

class MovesHandler(tornado.web.RequestHandler):
    def get(self, move_seq_str):
        # logging.info('/moves/ with %r' % move_seq_str)
        self.write(render_moves(move_seq_str))

class ScrambleHandler(tornado.web.RequestHandler):
    def get(self):
        move_seq_str = HTTPClient().fetch(scramble_url).body.strip()
        # logging.info('/ with %r' % move_seq_str)
        self.write(render_moves(move_seq_str))

application = tornado.web.Application([
    (r'/', ScrambleHandler),
    (r'/moves/(.*)', MovesHandler),
])

if __name__ == '__main__':
    logging.basicConfig(level    = logging.DEBUG,
                        filename = logfile_path,
                        filemode = 'a+',
                        format   = '%(asctime)-15s %(levelname)-8s %(message)s')
    sys.orig_stdout = sys.stdout
    sys.orig_stderr = sys.stderr
    sys.stdout = LoggerWriter(logging.getLogger(), logging.INFO)
    sys.stderr = LoggerWriter(logging.getLogger(), logging.ERROR)
    print 'Starting Tornado server.'
    # logging.info('Starting Tornado server.')

    # application.listen(8888)
    application.listen(14853)  # The port assigned by WebFaction
    tornado.ioloop.IOLoop.instance().start()