add ConstantRouter

lib/carbon/routers.py

@@ -31,6 +31,29 @@ def getDestinations(self, key):
     raise NotImplementedError()
 
 
+class ConstantRouter(DatapointRouter):
+  plugin_name = 'constant'
+
+  def __init__(self, settings):
+    self.destinations = set()
+
+  def addDestination(self, destination):
+    self.destinations.add(destination)
+
+  def removeDestination(self, destination):
+    self.destinations.discard(destination)
+
+  def hasDestination(self, destination):
+    return destination in self.destinations
+
+  def countDestinations(self):
+    return len(self.destinations)
+
+  def getDestinations(self, key):
+    for destination in self.destinations:
+      yield destination
+
+
 class RelayRulesRouter(DatapointRouter):
   plugin_name = 'rules'
 

lib/carbon/tests/test_routers.py

@@ -54,5 +54,5 @@ def testBasic(self):
                 router.addDestination(parseDestination(destination))
             self.assertEqual(
                 len(list(router.getDestinations('foo.bar'))),
-                settings['REPLICATION_FACTOR']
+                len(DESTINATIONS) if plugin == 'constant' else settings['REPLICATION_FACTOR']
             )