[WIP] work on history writer

Change-Id: If8c42091c734fb8c7b386c06429f1b21a7e169ec

secop/protocol/dispatcher.py

@@ -47,7 +47,8 @@ from secop.errors import NoSuchCommandError, NoSuchModuleError, \
 from secop.params import Parameter
 from secop.protocol.messages import COMMANDREPLY, DESCRIPTIONREPLY, \
     DISABLEEVENTSREPLY, ENABLEEVENTSREPLY, ERRORPREFIX, EVENTREPLY, \
-    HEARTBEATREPLY, IDENTREPLY, IDENTREQUEST, READREPLY, WRITEREPLY
+    HEARTBEATREPLY, IDENTREPLY, IDENTREQUEST, READREPLY, WRITEREPLY, \
+    ERRORCLOSED
 
 
 def make_update(modulename, pobj):
@@ -297,6 +298,7 @@ class Dispatcher:
         self.log.error('should have been handled in the interface!')
 
     def handle__ident(self, conn, specifier, data):
+        self._active_connections.discard(conn)
         return (IDENTREPLY, None, None)
 
     def handle_describe(self, conn, specifier, data):
@@ -372,3 +374,12 @@ class Dispatcher:
             self._active_connections.discard(conn)
             # XXX: also check all entries in self._subscriptions?
         return (DISABLEEVENTSREPLY, None, None)
+
+    def close(self):
+        for conn in self._connections:
+            try:
+                # - may be used for the 'closed' message in serial interface
+                # - is used in frappy history for indicating the close time
+                conn.close_message((ERRORCLOSED, None, None))
+            except AttributeError:
+                pass