Removed invirt-web-afs-apache

[invirt/packages/invirt-base.git] / python / invirt / common.py

diff --git a/python/invirt/common.py b/python/invirt/common.py
index e4f7c25..77b8da5 100644 (file)
--- a/python/invirt/common.py
+++ b/python/invirt/common.py
@@ -10,24 +10,28 @@ class InvirtConfigError(AttributeError):
 
 class struct(dict):
     'A simple namespace object.'
-    def __init__(self, d = {}, __prefix = None, **kwargs):
+    def __init__(self, d = {}, __prefix = None, __default=None, **kwargs):
         super(struct, self).__init__(d)
         self.__prefix = __prefix
+        self.__default = __default
         self.update(kwargs)
     def __getattr__(self, key):
         try:
             return self[key]
         except KeyError:
-            # XX ideally these would point a frame higher on the stack.
-            prefix = self.__prefix
-            if prefix is not None:
-                raise InvirtConfigError('missing configuration variable %s%s'
-                                        % (prefix, key))
+            if self.__default is None:
+                # XX ideally these would point a frame higher on the stack.
+                prefix = self.__prefix
+                if prefix is not None:
+                    raise InvirtConfigError('missing configuration variable '
+                                            '%s%s' % (prefix, key))
+                else:
+                    raise AttributeError("anonymous struct has no member '%s'"
+                                         % (key,))
             else:
-                raise AttributeError("anonymous struct has no member '%s'"
-                                     % (key,))
+                return struct({}, '', self.__default)
 
-def dicts2struct(x, prefix = None):
+def dicts2struct(x, prefix = None, default = None):
     """
     Given a tree of lists/dicts, perform a deep traversal to transform all the
     dicts to structs.
@@ -37,13 +41,15 @@ def dicts2struct(x, prefix = None):
     else:
         def newprefix(k): return prefix
     if type(x) == dict:
-        return struct(((k, dicts2struct(v, newprefix(k)))
+        return struct(((k, dicts2struct(v, newprefix(k), default))
                        for k,v in x.iteritems()),
-                      prefix)
+                      prefix,
+                      default)
     elif type(x) == list:
-        return [dicts2struct(v, newprefix(i)) for i, v in enumerate(x)]
+        return [dicts2struct(v, newprefix(i), default)
+                for i, v in enumerate(x)]
     elif x is None:
-        return struct({}, prefix)
+        return struct({}, prefix, default)
     else:
         return x