app.py

#!/usr/bin/env python

# This file may be used instead of Apache mod_wsgi to run your python
# web application in a different framework.  A few examples are
# provided (cherrypi, gevent), but this file may be altered to run
# whatever framework is desired - or a completely customized service.
#
import imp
import os
import sys

try:
  virtenv = os.path.join(os.environ.get('OPENSHIFT_PYTHON_DIR','.'), 'virtenv')
  python_version = "python"+str(sys.version_info[0])+"."+str(sys.version_info[1]) 
  os.environ['PYTHON_EGG_CACHE'] = os.path.join(virtenv, 'lib', python_version, 'site-packages')
  virtualenv = os.path.join(virtenv, 'bin','activate_this.py')
  if(sys.version_info[0] < 3):
    execfile(virtualenv, dict(__file__=virtualenv))
  else:
    exec(open(virtualenv).read(), dict(__file__=virtualenv))
    
except IOError:
  pass

#
# IMPORTANT: Put any additional includes below this line.  If placed above this
# line, it's possible required libraries won't be in your searchable path
#


#
#  main():
#
if __name__ == '__main__':
  application = imp.load_source('app', 'server.py')
  port = application.app.config['PORT']
  ip = application.app.config['IP']
  app_name = application.app.config['APP_NAME']
  host_name = application.app.config['HOST_NAME']

  fwtype="wsgiref"
  for fw in ("gevent", "cherrypy", "flask"):
    try:
      imp.find_module(fw)
      fwtype = fw
    except ImportError:
      pass

  print('Starting WSGIServer type %s on %s:%d ... ' % (fwtype, ip, port))
  if fwtype == "gevent":
    from gevent.pywsgi import WSGIServer
    WSGIServer((ip, port), application.app).serve_forever()

  elif fwtype == "cherrypy":
    from cherrypy import wsgiserver
    server = wsgiserver.CherryPyWSGIServer(
      (ip, port), application.app, server_name=host_name)
    server.start()

  elif fwtype == "flask":
    from flask import Flask
    server = Flask(__name__)
    server.wsgi_app = application.app
    server.run(host=ip, port=port)

  else:
    from wsgiref.simple_server import make_server
    make_server(ip, port, application.app).serve_forever()