Stickum

import cherrypy

from cherrypy import _cptree, _cpengine, engine

__all__ = ["Tree", "start_cp_engine"]

class Tree(_cptree.Tree):

    """Extends CherryPy's  _cptree.Tree to set the correct PATH_INFO

    and SCRIPT_NAME to support a SCRIPT_NAME != '' (when not mounted

    at the stack's root)."""

    def __call__(self, environ, start_response):

        # Try to look up the app using *only* path_info

        path = environ.get('PATH_INFO', '/')

        sn = self.script_name(path)

        if sn is None:

            start_response('404 Not Found', [])

            return ["Path %s was not found" % path]

        # Correct the SCRIPT_NAME and PATH_INFO environ entries.

        environ = environ.copy()

        # We concat script_name + path_info

        environ['SCRIPT_NAME'] = environ.get('SCRIPT_NAME', '') + sn

        environ['PATH_INFO'] = path[len(sn.rstrip("/")):]

        app = self.apps[sn]

        return app(environ, start_response)

    def mount(self, root, script_name="", config=None):

        if isinstance(root, _cptree.Application):

            app = root

        else:

            # Set script_name to None so apps always use environ['SCRIPT_NAME']

            app = _cptree.Application(root, None)

        super(Tree, self).mount(app, script_name, config)

def start_cp_engine():

    """Starts the CP engine (if not started already) letting paster 

    handle autoreloading and disabling config. checking."""

    engine.autoreload_on = False

    engine.checker = None

    #XXX Server won't exit on Interrupt if deadlock_poll_freq > 0

    engine.deadlock_poll_freq = -1

    if engine.state not in [_cpengine.STARTED, _cpengine.STARTING]:

        engine.start(blocking=False)