Fix memory memory leak

- Tuple to strict pair
- Self-recursive loops with more knot tying <- this was the thing

src/HomeAssistant/Controller.hs

@@ -27,7 +27,7 @@ module HomeAssistant.Controller
   , Light(..)
   ) where
 
-import AFRP (Mealy (..), eff, Event(..), events, filterA, (>>|), toEvent, Request)
+import AFRP (Mealy (..), Pair (..), eff, Event(..), events, filterA, (>>|), toEvent, Request)
 import Control.Arrow (Arrow(..), returnA)
 import Control.Category ((>>>))
 import Data.Aeson (Value, object, (.=))
@@ -65,9 +65,11 @@ debug = proc x -> do
   returnA -< x
 
 traceEvent :: Show a => HASS (Event a) (Event a)
-traceEvent = Mealy mempty $ \nt req -> \case
-  Event a -> nt (Trace req a) >>= \() -> pure (Event a, traceEvent)
-  Tick -> pure (Tick, traceEvent)
+traceEvent = m
+  where
+    m = Mealy mempty $ \nt req -> \case
+      Event a -> nt (Trace req a) >>= \() -> pure (Pair (Event a) m)
+      Tick -> pure (Pair Tick m)
 
 traceValue :: Show a => HASS a a
 traceValue = proc x -> do