[2676] Convert DDNS to use rpc_call

Just a straight-forward conversion.

src/bin/ddns/ddns.py.in

@@ -32,7 +32,6 @@ import isc.util.cio.socketsession
 import isc.server_common.tsig_keyring
 from isc.server_common.dns_tcp import DNSTCPContext
 from isc.datasrc import DataSourceClient
-from isc.server_common.auth_command import auth_loadzone_command
 import select
 import time
 import errno
@@ -544,12 +543,9 @@ class DDNSServer:
     def __notify_start_forwarder(self):
         '''Notify auth that DDNS Update messages can now be forwarded'''
         try:
-            seq = self._cc._session.group_sendmsg(create_command(
-                    "start_ddns_forwarder"), AUTH_MODULE_NAME)
-            answer, _ = self._cc._session.group_recvmsg(False, seq)
-            rcode, error_msg = parse_answer(answer)
-            if rcode != 0:
-                logger.error(DDNS_START_FORWARDER_ERROR, error_msg)
+            self._cc.rpc_call("start_ddns_forwarder", AUTH_MODULE_NAME)
+        except RPCError as e:
+            logger.error(DDNS_START_FORWARDER_ERROR, e)
         except (SessionTimeout, SessionError, ProtocolError) as ex:
             logger.error(DDNS_START_FORWARDER_FAIL, ex)
 
@@ -558,28 +554,25 @@ class DDNSServer:
 
         '''
         try:
-            seq = self._cc._session.group_sendmsg(create_command(
-                    "stop_ddns_forwarder"), AUTH_MODULE_NAME)
-            answer, _ = self._cc._session.group_recvmsg(False, seq)
-            rcode, error_msg = parse_answer(answer)
-            if rcode != 0:
-                logger.error(DDNS_STOP_FORWARDER_ERROR, error_msg)
+            self._cc.rpc_call("stop_ddns_forwarder", AUTH_MODULE_NAME)
+        except RPCError as e:
+            logger.error(DDNS_STOP_FORWARDER_ERROR, e)
         except (SessionTimeout, SessionError, ProtocolError) as ex:
             logger.error(DDNS_STOP_FORWARDER_FAIL, ex)
 
     def __notify_auth(self, zname, zclass):
         '''Notify auth of the update, if necessary.'''
-        msg = auth_loadzone_command(self._cc, zname, zclass)
-        if msg is not None:
-            self.__notify_update(AUTH_MODULE_NAME, msg, zname, zclass)
+        param = {'origin': zname.to_text(), 'class': zclass.to_text()}
+        self.__notify_update(AUTH_MODULE_NAME, 'loadzone', param, zname,
+                             zclass)
 
     def __notify_xfrout(self, zname, zclass):
         '''Notify xfrout of the update.'''
         param = {'zone_name': zname.to_text(), 'zone_class': zclass.to_text()}
-        msg = create_command('notify', param)
-        self.__notify_update(XFROUT_MODULE_NAME, msg, zname, zclass)
+        self.__notify_update(XFROUT_MODULE_NAME, 'notify', param, zname,
+                             zclass)
 
-    def __notify_update(self, modname, msg, zname, zclass):
+    def __notify_update(self, modname, command, params, zname, zclass):
         '''Notify other module of the update.
 
         Note that we use blocking communication here.  While the internal
@@ -599,18 +592,14 @@ class DDNSServer:
 
         '''
         try:
-            seq = self._cc._session.group_sendmsg(msg, modname)
-            answer, _ = self._cc._session.group_recvmsg(False, seq)
-            rcode, error_msg = parse_answer(answer)
-        except (SessionTimeout, SessionError, ProtocolError) as ex:
-            rcode = 1
-            error_msg = str(ex)
-        if rcode == 0:
+            # FIXME? Do we really need to wait for the answer here? Shouldn't
+            # this be some kind of notification instead?
+            self._cc.rpc_call(command, modname, params=params)
             logger.debug(TRACE_BASIC, DDNS_UPDATE_NOTIFY, modname,
                          ZoneFormatter(zname, zclass))
-        else:
+        except (SessionTimeout, SessionError, ProtocolError, RPCError) as ex:
             logger.error(DDNS_UPDATE_NOTIFY_FAIL, modname,
-                         ZoneFormatter(zname, zclass), error_msg)
+                         ZoneFormatter(zname, zclass), ex)
 
     def handle_session(self, fileno):
         """Handle incoming session on the socket with given fileno.

src/bin/ddns/tests/ddns_test.py

@@ -191,7 +191,7 @@ class FakeKeyringModule:
         '''Simply return the predefined TSIG keyring unconditionally.'''
         return TEST_TSIG_KEYRING
 
-class MyCCSession(isc.config.ConfigData):
+class MyCCSession(isc.config.ModuleCCSession):
     '''Fake session with minimal interface compliance.'''
 
     # faked CC sequence used in group_send/recvmsg
@@ -276,7 +276,8 @@ class MyCCSession(isc.config.ConfigData):
                     'secondary_zones')
                 return seczone_default, True
 
-    def group_sendmsg(self, msg, group):
+    def group_sendmsg(self, msg, group, instance='*', to='*',
+                      want_answer=False):
         # remember the passed parameter, and return dummy sequence
         self._sent_msg.append((msg, group))
         if self._sendmsg_exception is not None: