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CherryPy / _cputil.py

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"""
Copyright (c) 2004, CherryPy Team (team@cherrypy.org)
All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
    * Neither the name of the CherryPy Team nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
"""


"""
A module containing a few utility classes/functions used by CherryPy
"""

import time, thread, cpg, _cpdefaults, cperror

try: import zlib
except ImportError: pass

class EmptyClass:
    """ An empty class """
    pass

class ThreadAwareClass(object):
    """ A thread-safe class for storing/retrieving
        thread-specific variables """

    def __init__(self):
        self.__dict__['threadMap'] = {} # Used to store variables

    def __setattr__(self, name, value):
        id = thread.get_ident()
        if not self.__dict__['threadMap'].has_key(id):
            self.__dict__['threadMap'][id] = {}
        self.threadMap[id][name] = value

    def __getattr__(self, name):
        id = thread.get_ident()
        return self.__dict__['threadMap'][id][name]

def getSpecialFunction(name):
    """ Return the special function """

    # First, we look for the method in the right-most object
    # If it's not there, we try the previous object and so on until
    # we reach cpg.root
    # If it's still not there, we use the implementation from the
    # "_cpdefaults.py" module
    

    moduleList = [_cpdefaults]
    root = getattr(cpg, 'root', None)
    if root:
        moduleList.append(root)
        # Try object path
        try:
            path = cpg.request.path
        except:
            path = '/'
        if path:
            pathList = path.split('/')[1:]

            obj = cpg.root
            previousObj = None
            # Successively get objects from the path
            for newObj in pathList:
                previousObj = obj
                try:
                    obj = getattr(obj, newObj)
                    moduleList.append(obj)
                except AttributeError:
                    break

    moduleList.reverse()
    for module in moduleList:
        func = getattr(module, name, None)
        if func != None:
            return func

    raise cperror.InternalError, "Special function %s could not be found" % repr(name)