ZODB Components: Log error *and* traceback for both Extension and Document Components.

product/ERP5Type/dynamic/component_package.py

@@ -407,6 +407,32 @@ class ComponentDynamicPackage(ModuleType):
     with aq_method_lock:
       return self.__load_module(fullname)
 
+  def find_load_module(self, name):
+    """
+    Find and load a Component module.
+
+    When FS fallback is required (mainly for Document and Extension), this
+    should be used over a plain import to distinguish a document not available
+    as ZODB Component to an error in a Component, especially because in the
+    latter case only ImportError can be raised (PEP-302).
+
+    For example: if a Component tries to import another Component module but
+    the latter has been disabled and there is a fallback on the filesystem, a
+    plain import would hide the real error, instead log it...
+    """
+    fullname = self._namespace + '.' + name
+    loader = self.find_module(fullname)
+    if loader is not None:
+      try:
+        return loader.load_module(fullname)
+      except ImportError, e:
+        import traceback
+        LOG("ERP5Type.dynamic", WARNING,
+            "Could not load Component module '%s'\n%s" % (fullname,
+                                                          traceback.format_exc()))
+
+    return None
+
   def reset(self, sub_package=None):
     """
     Reset the content of the current package and its version package as well

product/ERP5Type/dynamic/portal_type_class.py

@@ -195,15 +195,8 @@ def generatePortalTypeClass(site, portal_type_name):
     if not (type_class_namespace.startswith('Products.ERP5Type') or
             portal_type_name in core_portal_type_class_dict):
       import erp5.component.document
-      module_fullname = 'erp5.component.document.' + type_class
-      module_loader = erp5.component.document.find_module(module_fullname)
-      if module_loader is not None:
-        try:
-          module = module_loader.load_module(module_fullname)
-        except ImportError, e:
-          LOG("ERP5Type.dynamic", WARNING,
-              "Could not load Component module '%s': %s" % (module_fullname, e))
-        else:
+      module = erp5.component.document.find_load_module(type_class)
+      if module is not None:
         try:
           klass = getattr(module, type_class)
         except AttributeError:

product/ERP5Type/patches/ExternalMethod.py

@@ -81,11 +81,11 @@ if 1:
         - fix magic "self" argument when positional arguments get their values
           from kw.
         """
-        try:
-            component_module = __import__('erp5.component.extension.' + self._module,
-                                          fromlist=['erp5.component.extension'],
-                                          level=0)
-        except ImportError:
+        import erp5.component.extension
+        component_module = erp5.component.extension.find_load_module(self._module)
+        if component_module is not None:
+            f = getattr(component_module, self._function)
+        else:
             import Globals  # for data
 
             filePath = self.filepath()
@@ -103,8 +103,6 @@ if 1:
                 self.reloadIfChanged()
 
             f = None
-        else:
-            f = getattr(component_module, self._function)
 
         _v_f = getattr(self, '_v_f', None)
         if not _v_f or (f and f is not _v_f):