Triggers instead of full state events

src/HomeAssistant/Controller.hs

@@ -30,6 +30,7 @@ import Control.Arrow (Arrow(..), returnA)
 import Control.Category ((>>>))
 import Data.Aeson (Value)
 import qualified Data.Text as T
+import qualified Data.Set as S
 import Control.Lens (has, only, (^?), to)
 import Data.Aeson.Lens (key, _String)
 import qualified Data.Text.Lens as TL
@@ -62,7 +63,7 @@ debug = proc x -> do
   returnA -< x
 
 traceEvent :: Show a => HASS (Event a) (Event a)
-traceEvent = Mealy $ \nt req -> \case
+traceEvent = Mealy mempty $ \nt req -> \case
   Event a -> nt (Trace req a) >>= \() -> pure (Event a, traceEvent)
   Tick -> pure (Tick, traceEvent)
 
@@ -107,20 +108,20 @@ entityChangeEvent :: T.Text -> Mealy eff (Event Value) (Event Value)
 entityChangeEvent entityId = entityChangeEvent' entityId >>> toEvent
 
 entityChangeEvent' :: T.Text -> Mealy eff (Event Value) (Either () Value)
-entityChangeEvent' entityId = events >>| filterA isEntity
+entityChangeEvent' entityId = Mealy (S.singleton entityId) $ runMealy (events >>| filterA isEntity)
   where
     isEntity :: Value -> Bool
-    isEntity = has (key "event" . key "data" . key "entity_id" . _String . only entityId)
+    isEntity = has (key "event" . key "variables" . key "trigger" . key "entity_id" . _String . only entityId)
 
 entityRead' :: (Read a) => T.Text -> Mealy eff (Event Value) (Either () a)
 entityRead' entityId = entityChangeEvent' entityId >>| (arr state >>> arr (maybe (Left ()) Right))
   where
-    state v = v ^? key "event" . key "data" . key "new_state" . key "state" . _String . TL.unpacked . to read
+    state v = v ^? key "event" . key "variables" . key "trigger" . key "to_state" . key "state" . _String . TL.unpacked . to read
 
 entityBool' :: T.Text -> Mealy eff (Event Value) (Either () Bool)
 entityBool' entityId = entityChangeEvent' entityId >>| (arr state >>> arr (maybe (Left ()) Right))
   where
-    state v = v ^? key "event" . key "data" . key "new_state" . key "state" . _String . TL.unpacked . to toBool
+    state v = v ^? key "event" . key "variables" . key "trigger" . key "to_state" . key "state" . _String . TL.unpacked . to toBool
     toBool = \case
       "on" -> True
       "off" -> False

src/HomeAssistant/Controller/Bedroom.hs

@@ -79,7 +79,7 @@ ikeaQuickButton entityId =
   >>| arr (maybe (Left ()) Right . eventType)
   >>> toEvent
   where
-    eventType v = v ^? key "event" . key "data" . key "new_state" . key "attributes" . key "event_type" . _String . to toIkeaQuickButton . traversed
+    eventType v = v ^? key "event" . key "variables" . key "trigger" . key "to_state" . key "attributes" . key "event_type" . _String . to toIkeaQuickButton . traversed
 
 
 data BedroomControls

src/HomeAssistant/Runtime.hs

@@ -35,7 +35,7 @@ import Control.Monad.Fix (MonadFix)
 import HomeAssistant.Controller.Ruuvi (ruuviController)
 
 step :: (MonadFix m, MonadIO m) => (forall x. eff x -> m x) -> UUID -> Mealy eff a b -> a -> m (b, Mealy eff a b)
-step nt trace (Mealy f) a = do
+step nt trace (Mealy _ f) a = do
   now <- liftIO getCurrentTime
   f nt (Request now trace) a
 
@@ -47,7 +47,7 @@ controllers =
   , Controller "bedroom-button" bedroomButtonController False -- This works but leaving for vacation
   , Controller "bedroom-drawer" bedroomDrawerController True
   , Controller "bedroom-humidifier" humidifierController False
-  , Controller "ruuvi-controller" ruuviController False
+  , Controller "ruuvi-controller" ruuviController True
   ]
 
 -- | Steps the machine for every inbound message; service calls go to the
@@ -71,8 +71,10 @@ defaultMain = withSocketsDo $ do
   withBus severity $ \bus -> do
     token <- getEnv "HA_TOKEN"
     host <- getEnv "HA_HOST"
-    let workers =
-          [ ("reader", readerAction host 8123 token bus)
+    let active = [c | c@(Controller _ _ True) <- controllers]
+        ents = foldMap (\(Controller _ m _) -> entities m) active
+        workers =
+          [ ("reader", readerAction host 8123 token ents bus)
           , ("writer", writerAction bus)
           ] ++ [ (name, runController bus c) | c@(Controller name _ True) <- controllers ]
     as <- mapM (\(name, act) -> async (supervised name defaultBackoff act)) workers

src/HomeAssistant/Runtime/Connection.hs

@@ -18,10 +18,11 @@ import Control.Concurrent.STM
 import Control.Exception (onException)
 import Control.Exception.Annotated (throw)
 import Control.Lens ((^?))
-import Control.Monad (forever)
+import Control.Monad (forever, forM_)
 import Data.Aeson (Value, eitherDecode, encode, object, (.=))
 import Data.Aeson.Lens (key, _String)
 import qualified Data.ByteString.Lazy as BL
+import qualified Data.Set as S
 import qualified Data.Text as T
 import Data.Void (Void)
 import HomeAssistant.Controller (Service (..), Target (..))
@@ -35,11 +36,11 @@ import AFRP (Request(..))
 -- | Connect, authenticate, subscribe, then receive and broadcast forever.
 -- Restarting this action reconnects. All setup sends happen before the
 -- connection is published in the bus, so only the writer sends afterwards.
-readerAction :: String -> Int -> String -> Bus -> IO Void
-readerAction host port token bus =
+readerAction :: String -> Int -> String -> S.Set T.Text -> Bus -> IO Void
+readerAction host port token ents bus =
   WS.runClient host port "/api/websocket" $ \conn -> do
     handshake conn token
-    subscribe bus conn
+    subscribe bus conn ents
     atomically $ writeTVar (busConn bus) (Just conn)
     putStrLn "[reader] connected"
     -- Unpublish on exit so the writer blocks and the backlog survives the outage.
@@ -62,14 +63,19 @@ expectType expected msg =
     Just t | t == expected -> pure ()
     _ -> throw (Fatal $ "expected " <> expected <> ", got: " <> T.pack (show msg))
 
-subscribe :: Bus -> WS.Connection -> IO ()
-subscribe bus conn = do
-  sid <- generateCallId (busGen bus)
-  WS.sendTextData conn $ encode $ object
-    [ "id"         .= sid
-    , "type"       .= ("subscribe_events" :: T.Text)
-    , "event_type" .= ("state_changed" :: T.Text)
-    ]
+subscribe :: Bus -> WS.Connection -> S.Set T.Text -> IO ()
+subscribe bus conn ents =
+  forM_ (S.toList ents) $ \entityId -> do
+    print entityId
+    sid <- generateCallId (busGen bus)
+    WS.sendTextData conn $ encode $ object
+      [ "id"         .= sid
+      , "type"       .= ("subscribe_trigger" :: T.Text)
+      , "trigger"    .= object
+        [ "platform" .= ("state" :: T.Text)
+        , "entity_id" .= entityId
+        ]
+      ]
 
 -- | Undecodable messages are skipped: reconnecting cannot fix a decode
 -- problem, so crashing here would only produce a hot restart loop.