[1789] address review comments

All in xfrin memory zones handlers;
- normalize zone name and class
- provide strong exception guarantee in _set_memory_zones
- fix comment in _set_db_file
- make _auth_config_update 'protected'

And in the tests:
- extracted memory zones update tests to own class
- added tests for bad data
- added tests for normalization

src/bin/xfrin/tests/xfrin_test.py

@@ -2577,61 +2577,64 @@ class TestXfrin(unittest.TestCase):
         self.common_ixfr_setup('refresh', False)
         self.assertEqual(RRType.AXFR(), self.xfr.xfrin_started_request_type)
 
-    def test_memory_zones(self):
+class TextXfrinMemoryZones(unittest.TestCase):
+    def setUp(self):
+        self.xfr = MockXfrin()
         # Configuration snippet containing 2 memory datasources,
         # one for IN and one for CH. Both contain a zone 'example.com'
         # the IN ds also contains a zone example2.com, and a zone example3.com,
         # which is of file type 'text' (and hence, should be ignored)
-        config = { 'datasources': [
-                     { 'type': 'memory',
-                       'class': 'IN',
-                       'zones': [
-                         { 'origin': 'example.com',
-                           'filetype': 'sqlite3' },
-                         { 'origin': 'example2.com',
-                           'filetype': 'sqlite3' },
-                         { 'origin': 'example3.com',
-                           'filetype': 'text' }
-                       ]
-                     },
-                     { 'type': 'memory',
-                       'class': 'CH',
-                       'zones': [
-                         { 'origin': 'example.com',
-                           'filetype': 'sqlite3' }
-                       ]
-                     }
-                 ] }
-
+        self.config = { 'datasources': [
+                          { 'type': 'memory',
+                            'class': 'IN',
+                            'zones': [
+                              { 'origin': 'example.com',
+                                'filetype': 'sqlite3' },
+                              { 'origin': 'EXAMPLE2.com.',
+                                'filetype': 'sqlite3' },
+                              { 'origin': 'example3.com',
+                                'filetype': 'text' }
+                            ]
+                          },
+                          { 'type': 'memory',
+                            'class': 'CH',
+                            'zones': [
+                              { 'origin': 'example.com',
+                                'filetype': 'sqlite3' }
+                            ]
+                          }
+                      ] }
+
+    def test_updates(self):
         self.assertFalse(self.xfr._is_memory_zone("example.com", "IN"))
         self.assertFalse(self.xfr._is_memory_zone("example2.com", "IN"))
         self.assertFalse(self.xfr._is_memory_zone("example3.com", "IN"))
         self.assertFalse(self.xfr._is_memory_zone("example.com", "CH"))
 
         # add them all
-        self.xfr._set_memory_zones(config, None)
+        self.xfr._set_memory_zones(self.config, None)
         self.assertTrue(self.xfr._is_memory_zone("example.com", "IN"))
         self.assertTrue(self.xfr._is_memory_zone("example2.com", "IN"))
         self.assertFalse(self.xfr._is_memory_zone("example3.com", "IN"))
         self.assertTrue(self.xfr._is_memory_zone("example.com", "CH"))
 
-        # Remove the CH data source from the config snippet, and update
-        del config['datasources'][1]
-        self.xfr._set_memory_zones(config, None)
+        # Remove the CH data source from the self.config snippet, and update
+        del self.config['datasources'][1]
+        self.xfr._set_memory_zones(self.config, None)
         self.assertTrue(self.xfr._is_memory_zone("example.com", "IN"))
         self.assertTrue(self.xfr._is_memory_zone("example2.com", "IN"))
         self.assertFalse(self.xfr._is_memory_zone("example3.com", "IN"))
         self.assertFalse(self.xfr._is_memory_zone("example.com", "CH"))
 
         # Remove example2.com from the datasource, and update
-        del config['datasources'][0]['zones'][1]
-        self.xfr._set_memory_zones(config, None)
+        del self.config['datasources'][0]['zones'][1]
+        self.xfr._set_memory_zones(self.config, None)
         self.assertTrue(self.xfr._is_memory_zone("example.com", "IN"))
         self.assertFalse(self.xfr._is_memory_zone("example2.com", "IN"))
         self.assertFalse(self.xfr._is_memory_zone("example3.com", "IN"))
         self.assertFalse(self.xfr._is_memory_zone("example.com", "CH"))
 
-        # If 'datasources' is not in the config update list (i.e. its config
+        # If 'datasources' is not in the self.config update list (i.e. its self.config
         # has not changed), no difference should be found
         self.xfr._set_memory_zones({}, None)
         self.assertTrue(self.xfr._is_memory_zone("example.com", "IN"))
@@ -2640,13 +2643,70 @@ class TestXfrin(unittest.TestCase):
         self.assertFalse(self.xfr._is_memory_zone("example.com", "CH"))
 
         # If datasources list becomes empty, everything should be removed
-        config['datasources'][0]['zones'] = []
-        self.xfr._set_memory_zones(config, None)
+        self.config['datasources'][0]['zones'] = []
+        self.xfr._set_memory_zones(self.config, None)
         self.assertFalse(self.xfr._is_memory_zone("example.com", "IN"))
         self.assertFalse(self.xfr._is_memory_zone("example2.com", "IN"))
         self.assertFalse(self.xfr._is_memory_zone("example3.com", "IN"))
         self.assertFalse(self.xfr._is_memory_zone("example.com", "CH"))
 
+    def test_normalization(self):
+        self.xfr._set_memory_zones(self.config, None)
+        # make sure it is case insensitive, root-dot-insensitive,
+        # and supports CLASSXXX notation
+        self.assertTrue(self.xfr._is_memory_zone("EXAMPLE.com", "IN"))
+        self.assertTrue(self.xfr._is_memory_zone("example2.com.", "IN"))
+        self.assertTrue(self.xfr._is_memory_zone("example.com", "CLASS3"))
+        
+    def test_bad_name(self):
+        # First set it to some config
+        self.xfr._set_memory_zones(self.config, None)
+
+        # Error checking; bad owner name should result in no changes
+        self.config['datasources'][1]['zones'][0]['origin'] = ".."
+        self.xfr._set_memory_zones(self.config, None)
+        self.assertTrue(self.xfr._is_memory_zone("example.com", "IN"))
+        self.assertTrue(self.xfr._is_memory_zone("example2.com", "IN"))
+        self.assertFalse(self.xfr._is_memory_zone("example3.com", "IN"))
+        self.assertTrue(self.xfr._is_memory_zone("example.com", "CH"))
+
+    def test_bad_class(self):
+        # First set it to some config
+        self.xfr._set_memory_zones(self.config, None)
+
+        # Error checking; bad owner name should result in no changes
+        self.config['datasources'][1]['class'] = "Foo"
+        self.xfr._set_memory_zones(self.config, None)
+        self.assertTrue(self.xfr._is_memory_zone("example.com", "IN"))
+        self.assertTrue(self.xfr._is_memory_zone("example2.com", "IN"))
+        self.assertFalse(self.xfr._is_memory_zone("example3.com", "IN"))
+        self.assertTrue(self.xfr._is_memory_zone("example.com", "CH"))
+
+    def test_no_filetype(self):
+        # omitting the filetype should leave that zone out, but not
+        # the rest
+        del self.config['datasources'][1]['zones'][0]['filetype']
+        self.xfr._set_memory_zones(self.config, None)
+        self.assertTrue(self.xfr._is_memory_zone("example.com", "IN"))
+        self.assertTrue(self.xfr._is_memory_zone("example2.com", "IN"))
+        self.assertFalse(self.xfr._is_memory_zone("example3.com", "IN"))
+        self.assertFalse(self.xfr._is_memory_zone("example.com", "CH"))
+
+    def test_class_filetype(self):
+        # omitting the class should have it default to what is in the
+        # specfile for Auth.
+        AuthConfigData = isc.config.config_data.ConfigData(
+            isc.config.module_spec_from_file(xfrin.AUTH_SPECFILE_LOCATION))
+        del self.config['datasources'][0]['class']
+        self.xfr._set_memory_zones(self.config, AuthConfigData)
+        self.assertTrue(self.xfr._is_memory_zone("example.com", "IN"))
+        self.assertTrue(self.xfr._is_memory_zone("example2.com", "IN"))
+        self.assertFalse(self.xfr._is_memory_zone("example3.com", "IN"))
+        self.assertTrue(self.xfr._is_memory_zone("example.com", "CH"))
+
+
+
+
 def raise_interrupt():
     raise KeyboardInterrupt()
 

src/bin/xfrin/xfrin.py.in

@@ -1270,7 +1270,7 @@ class Xfrin:
         config_data = self._module_cc.get_full_config()
         self.config_handler(config_data)
         self._module_cc.add_remote_config(AUTH_SPECFILE_LOCATION,
-                                          self.auth_config_handler)
+                                          self._auth_config_handler)
 
     def _cc_check_command(self):
         '''This is a straightforward wrapper for cc.check_command,
@@ -1317,7 +1317,7 @@ class Xfrin:
 
         return create_answer(0)
 
-    def auth_config_handler(self, new_config, config_data):
+    def _auth_config_handler(self, new_config, config_data):
         # Config handler for changes in Auth configuration
         self._set_db_file()
         self._set_memory_zones(new_config, config_data)
@@ -1333,6 +1333,13 @@ class Xfrin:
            in the in-memory datasource of the Auth process with file type
            'sqlite3'.
         """
+        # Normalize them first, if either conversion fails, return false
+        # (they won't be in the set anyway)
+        try:
+            zone_name_str = Name(zone_name_str).to_text().lower()
+            zone_class_str = RRClass(zone_class_str).to_text()
+        except Exception:
+            return False
         return (zone_name_str, zone_class_str) in self._memory_zones
 
     def _add_memory_zone(self, zone_name_str, zone_class_str):
@@ -1341,24 +1348,39 @@ class Xfrin:
         self._memory_zones.add((zone_name_str, zone_class_str))
 
     def _set_memory_zones(self, new_config, config_data):
-        """Part of the auth_config_handler function, keeps an internal set
+        """Part of the _auth_config_handler function, keeps an internal set
            of zones in the datasources config subset that have 'sqlite3' as
            their file type"""
-        if "datasources" in new_config:
-            self._clear_memory_zones()
-            for datasource in new_config["datasources"]:
-                if "class" in datasource:
-                    ds_class = datasource["class"]
-                else:
-                    # Get the default
-                    ds_class =\
-                        config_data.get_default_value("datasources/class")
-                if datasource["type"] == "memory":
-                    zones = []
-                    for zone in datasource["zones"]:
-                        if zone["filetype"] == "sqlite3":
-                            zone_name = zone["origin"]
-                            self._add_memory_zone(zone_name, ds_class)
+        # walk through the data and collect the memory zones
+        # If this causes any exception, assume we were passed bad data
+        # and keep the original set
+        new_memory_zones = set()
+        try:
+            if "datasources" in new_config:
+                for datasource in new_config["datasources"]:
+                    if "class" in datasource:
+                        ds_class = RRClass(datasource["class"])
+                    else:
+                        # Get the default
+                        ds_class = RRClass(config_data.get_default_value(
+                                               "datasources/class"))
+                    if datasource["type"] == "memory":
+                        for zone in datasource["zones"]:
+                            if "filetype" in zone and \
+                               zone["filetype"] == "sqlite3":
+                                zone_name = Name(zone["origin"])
+                                zone_name_str = zone_name.to_text().lower()
+                                new_memory_zones.add((zone_name_str,
+                                                      ds_class.to_text()))
+                # Ok, we can use the data, update our list
+                self._clear_memory_zones()
+                for zone_str, class_str in new_memory_zones:
+                    self._add_memory_zone(zone_str, class_str)
+        except Exception as eee:
+            # Something is wrong with the data. If this data even reached us,
+            # we cannot do more than assume the real module has logged and
+            # reported an error. Keep the old set.
+            return
 
     def shutdown(self):
         ''' shutdown the xfrin process. the thread which is doing xfrin should be
@@ -1503,9 +1525,8 @@ class Xfrin:
         db_file, is_default =\
             self._module_cc.get_remote_config_value("Auth", "database_file")
         if is_default and "B10_FROM_BUILD" in os.environ:
-            # this too should be unnecessary, but currently the
-            # 'from build' override isn't stored in the config
-            # (and we don't have writable datasources yet)
+            # override the local database setting if it is default and we
+            # are running from the source tree
             db_file = os.environ["B10_FROM_BUILD"] + os.sep +\
                       "bind10_zones.sqlite3"
         self._db_file = db_file