enable memcached tool by the existence of python-memcached (Bug #632).

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@13940 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/Tool/MemcachedTool.py

@@ -26,7 +26,6 @@
 #
 ##############################################################################
 
-from Products.ERP5Type import allowMemcachedTool
 from Products.ERP5Type.Tool.BaseTool import BaseTool
 from Products.ERP5Type import Permissions, _dtmldir
 from AccessControl import ClassSecurityInfo
@@ -34,7 +33,13 @@ from Globals import DTMLFile
 
 MEMCACHED_TOOL_MODIFIED_FLAG_PROPERTY_ID = '_v_memcached_edited'
 
-if allowMemcachedTool():
+try:
+  import memcache
+except ImportError:
+  memcache = None
+
+if memcache is not None:
+  # Real memcache tool
   import memcache
   import traceback
   from Shared.DC.ZRDB.TM import TM
@@ -306,7 +311,7 @@ if allowMemcachedTool():
       self._v_memcached_dict = None
 
 else:  
-  
+  # Placeholder memcache tool
   class MemcachedTool(BaseTool):
     """
       Dummy MemcachedTool placeholder.
@@ -326,10 +331,8 @@ else:
         if this function is called and memcachedtool is disabled, fail loudly
         with a meaningfull message.
       """
-      from Products.ERP5Type import memcached_tool_enable_path
-      raise RuntimeError, 'MemcachedTool is disabled. You should ask'\
-        ' the server administrator to enable it by creating the file %s' % \
-        (memcached_tool_enable_path, )
+      raise RuntimeError, 'MemcachedTool is disabled. You should ask the'\
+        ' server administrator to enable it by installing python-memcached.'
 
     setServerAddress = failingMethod
     getServerAddress = failingMethod
@@ -337,4 +340,3 @@ else:
     setServerAddressList = failingMethod
     memcached_tool_configure = failingMethod
     getMemcachedDict = failingMethod
-

product/ERP5Type/__init__.py

@@ -50,14 +50,10 @@ import Products.Localizer # So that we make sure Globals.get_request is availabl
 # read permissions for zope - this prevents security holes in 
 # production environment  
 class_tool_security_path = '%s%s%s' % (product_path, os.sep, 'ALLOW_CLASS_TOOL')
-memcached_tool_enable_path = '%s%s%s' % (product_path, os.sep, 'USE_MEMCACHED_TOOL')
 
 def allowClassTool():
   return os.access(class_tool_security_path, os.F_OK)
 
-def allowMemcachedTool():
-  return os.access(memcached_tool_enable_path, os.F_OK)
-
 def initialize( context ):
   # Import Product Components
   from Tool import ClassTool, CacheTool, MemcachedTool, SessionTool

product/ERP5Type/tests/utils.py

@@ -99,7 +99,6 @@ def _recreateClassTool(portal):
 def installRealMemcachedTool(portal):
   """Replaces portal_memcached by a real memcached tool object.
   """
-  Products.ERP5Type.allowMemcachedTool = lambda: 1
   _recreateMemcachedTool(portal)
 
 def _recreateMemcachedTool(portal):