Cheetah/Servlet.py

   1 #!/usr/bin/env python
   2 # $Id: Servlet.py,v 1.41 2007/04/04 00:55:27 tavis_rudd Exp $
   3 """Provides an abstract Servlet baseclass for Cheetah's Template class
   4
   5 Meta-Data
   6 ================================================================================
   7 Author: Tavis Rudd <tavis@damnsimple.com>
   8 License: This software is released for unlimited distribution under the
   9          terms of the MIT license.  See the LICENSE file.
  10 Version: $Revision: 1.41 $
  11 Start Date: 2001/10/03
  12 Last Revision Date: $Date: 2007/04/04 00:55:27 $
  13 """
  14 __author__ = "Tavis Rudd <tavis@damnsimple.com>"
  15 __revision__ = "$Revision: 1.41 $"[11:-2]
  16
  17 import sys
  18 import os.path
  19
  20 isWebwareInstalled = False
  21 try:
  22     try:
  23         from ds.appserver.Servlet import Servlet as BaseServlet
  24     except:
  25         from WebKit.Servlet import Servlet as BaseServlet
  26     isWebwareInstalled = True
  27
  28     if not issubclass(BaseServlet, object):
  29         class NewStyleBaseServlet(BaseServlet, object): pass
  30         BaseServlet = NewStyleBaseServlet
  31 except:
  32     class BaseServlet(object):
  33         _reusable = 1
  34         _threadSafe = 0
  35
  36         def __init__(self):
  37             pass
  38
  39         def awake(self, transaction):
  40             pass
  41
  42         def sleep(self, transaction):
  43             pass
  44
  45         def shutdown(self):
  46             pass
  47
  48 ##################################################
  49 ## CLASSES
  50
  51 class Servlet(BaseServlet):
  52
  53     """This class is an abstract baseclass for Cheetah.Template.Template.
  54
  55     It wraps WebKit.Servlet and provides a few extra convenience methods that
  56     are also found in WebKit.Page.  It doesn't do any of the HTTP method
  57     resolution that is done in WebKit.HTTPServlet
  58     """
  59
  60     transaction = None
  61     application = None
  62     request = None
  63     session = None
  64
  65     def __init__(self):
  66         BaseServlet.__init__(self)
  67
  68         # this default will be changed by the .awake() method
  69         self._CHEETAH__isControlledByWebKit = False
  70
  71     ## methods called by Webware during the request-response
  72
  73     def awake(self, transaction):
  74         BaseServlet.awake(self, transaction)
  75
  76         # a hack to signify that the servlet is being run directly from WebKit
  77         self._CHEETAH__isControlledByWebKit = True
  78
  79         self.transaction = transaction
  80         #self.application = transaction.application
  81         self.response = response = transaction.response
  82         self.request = transaction.request
  83
  84         # Temporary hack to accomodate bug in
  85         # WebKit.Servlet.Servlet.serverSidePath: it uses
  86         # self._request even though this attribute does not exist.
  87         # This attribute WILL disappear in the future.
  88         self._request = transaction.request()
  89
  90
  91         self.session = transaction.session
  92         self.write = response().write
  93         #self.writeln = response.writeln
  94
  95     def respond(self, trans=None):
  96         raise NotImplementedError("""\
  97 couldn't find the template's main method.  If you are using #extends
  98 without #implements, try adding '#implements respond' to your template
  99 definition.""")
 100
 101     def sleep(self, transaction):
 102         BaseServlet.sleep(self, transaction)
 103         self.session = None
 104         self.request  = None
 105         self._request  = None
 106         self.response = None
 107         self.transaction = None
 108
 109     def shutdown(self):
 110         pass
 111
 112     def serverSidePath(self, path=None,
 113                        normpath=os.path.normpath,
 114                        abspath=os.path.abspath
 115                        ):
 116
 117         if self._CHEETAH__isControlledByWebKit:
 118             return BaseServlet.serverSidePath(self, path)
 119         elif path:
 120             return normpath(abspath(path.replace("\\",'/')))
 121         elif hasattr(self, '_filePath') and self._filePath:
 122             return normpath(abspath(self._filePath))
 123         else:
 124             return None
 125
 126 # vim: shiftwidth=4 tabstop=4 expandtab