Switch to an explicit SUPPORTS setup

octodns/source/base.py

@@ -16,6 +16,9 @@ class BaseSource(object):
         if not hasattr(self, 'SUPPORTS_GEO'):
             raise NotImplementedError('Abstract base class, SUPPORTS_GEO '
                                       'property missing')
+        if not hasattr(self, 'SUPPORTS'):
+            raise NotImplementedError('Abstract base class, SUPPORTS '
+                                      'property missing')
 
     def populate(self, zone, target=False):
         '''
@@ -25,9 +28,7 @@ class BaseSource(object):
                                   'missing')
 
     def supports(self, record):
-        # Unless overriden and handled appropriaitely we'll assume that all
-        # record types are supported
-        return True
+        return record._type in self.SUPPORTS
 
     def __repr__(self):
         return self.__class__.__name__

octodns/source/tinydns.py

@@ -19,6 +19,7 @@ from .base import BaseSource
 
 class TinyDnsBaseSource(BaseSource):
     SUPPORTS_GEO = False
+    SUPPORTS = set(('A', 'CNAME', 'MX', 'NS'))
 
     split_re = re.compile(r':+')