patches/pylint: teach astroid about cryptography.hazmat.bindings._openssl

This version of pylint tries to import the C modules for analysis and
get confused by support ffi's CompiledFFI type.

Use our utility  _register_module_extender_from_live_module to register
a stub module instead.

This also reverts b21f83fc,
"BusinessTemplate_getPythonSourceCodeMessageList: Retry in case of
pylint internal failure." which is no longer necessary with these
changes.

product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/BusinessTemplate_getPythonSourceCodeMessageList.py

@@ -81,16 +81,8 @@ def checkComponent(component_instance):
   code = component_instance.getTextContent()
   if six.PY2:
     code = unicode(code, 'utf8')
-  data = {'code': code}
-  try:
-    check_result_json = portal.ERP5Site_checkPythonSourceCodeAsJSON(data)
-  except Exception:
-    # pylint sometimes raises on the first attempt at importing modules, but
-    # may succeed on the second try (probably because of incomplete cleanup
-    # of partially imported moduled). We are not interested in pylint issues,
-    # we are interested in our code's issues, so give it one more try.
-    check_result_json = portal.ERP5Site_checkPythonSourceCodeAsJSON(data)
-  for annotation in json.loads(check_result_json)['annotations']:
+  for annotation in json.loads(portal.ERP5Site_checkPythonSourceCodeAsJSON(
+        {'code': code}))['annotations']:
     annotation['component_path'] = component_relative_url
     line_list.append(
       Message(

product/ERP5Type/patches/pylint.py

@@ -372,6 +372,15 @@ else:
         return m
     MANAGER.register_transform(Module, wendelin_transform, lambda node: node.name == 'wendelin')
 
+# prevent a crash with cryptography:
+#   File "develop-eggs/astroid-1.3.8+slapospatched001-py2.7.egg/astroid/raw_building.py", line 360, in _set_proxied
+#      return _CONST_PROXY[const.value.__class__]
+#  KeyError: <type 'CompiledFFI'>
+import cryptography.hazmat.bindings._openssl
+_register_module_extender_from_live_module(
+  'cryptography.hazmat.bindings._openssl',
+  cryptography.hazmat.bindings._openssl)
+
 # Properly search for namespace packages: original astroid (as of 1.3.8) only
 # checks at top-level and it doesn't work for Shared.DC.ZRDB (defined in
 # Products.ZSQLMethods; Shared and Shared.DC being a namespace package defined

product/ERP5Type/tests/testDynamicClassGeneration.py

@@ -2299,6 +2299,13 @@ lxml.etree.Element('test')
 
 from BTrees.OOBTree import OOBTree
 OOBTree()
+
+from cryptography.hazmat.primitives.asymmetric import rsa
+rsa.generate_private_key(
+  public_exponent=65537,
+  key_size=2048,
+).public_key()
+
 """ % (dict(namespace=namespace,
             reference1=imported_reference1,
             module2=imported_module2,