explicitly save refs to webish and operations (instead of using Service methods)

src/allmydata/client.py

@@ -496,6 +496,12 @@ class _Client(node.Node, pollmixin.PollMixin):
     def get_long_tubid(self):
         return idlib.nodeid_b2a(self.nodeid)
 
+    def get_web_service(self):
+        """
+        :return: a reference to our web server
+        """
+        return self.getServiceNamed("webish")
+
     def _init_permutation_seed(self, ss):
         seed = self.config.get_config_from_file("permutation-seed")
         if not seed:

src/allmydata/web/directory.py

@@ -62,7 +62,7 @@ class DirectoryNodeHandler(RenderMixin, rend.Page, ReplaceMeMixin):
         self.node = node
         self.parentnode = parentnode
         self.name = name
-        self._operations = client.getServiceNamed("webish").getServiceNamed("operations")
+        self._operations = client.get_web_service().get_operations()
 
     def childFactory(self, ctx, name):
         name = name.decode("utf-8")

src/allmydata/webish.py

@@ -168,9 +168,9 @@ class WebishServer(service.MultiService):
 
         # If set, clock is a twisted.internet.task.Clock that the tests
         # use to test ophandle expiration.
-        operations = OphandleTable(clock)
-        operations.setServiceParent(self)
-        self.root.putChild("operations", operations)
+        self._operations = OphandleTable(clock)
+        self._operations.setServiceParent(self)
+        self.root.putChild("operations", self._operations)
 
     def buildServer(self, webport, nodeurl_path, staticdir):
         self.webport = webport
@@ -241,6 +241,12 @@ class WebishServer(service.MultiService):
             # who knows, probably some weirdo future version of Twisted
             self._started.errback(AssertionError("couldn't find out the scheme or port for the web-API server"))
 
+    def get_operations(self):
+        """
+        :return: a reference to our "active operations" tracker
+        """
+        return self._operations
+
 
 class IntroducerWebishServer(WebishServer):
     def __init__(self, introducer, webport, nodeurl_path=None, staticdir=None):