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|
{-# LANGUAGE OverloadedRecordDot #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE TemplateHaskell #-}
import Data.Function ((&))
import Data.Set (fromList)
import Data.Text (Text)
import Effectful (Eff, (:>), runEff)
import Effectful.Log (Log, LogLevel(LogInfo), runLog)
import Effectful.Reader.Static (Reader, ask, runReader)
import Effectful.Resource (runResource)
import Effectful.State.Static.Local (evalState)
import Hsm.Core.App (launch)
import Hsm.Core.Env (deriveFromYaml)
import Hsm.Core.Fsm qualified as F
import Hsm.GPIO (GPIO, GPIOEffect, runGPIO, toggle)
import Streamly.Data.Fold qualified as S (drain)
import Streamly.Data.Stream qualified as S (Stream, fold, mapM, repeat)
import System.IO.Echo (withoutInputEcho)
data Env = Env
{ name :: Text
, gpio :: [GPIO]
, period :: Int
}
$(deriveFromYaml ''Env)
stateOn :: F.FsmState () Bool Env Bool
stateOn = F.FsmState "on" action
where
action :: () -> Env -> Bool -> F.FsmOutput () Bool Env Bool
action _ _ sta =
F.FsmOutput
(Just $ F.FsmResult sta False stateOff)
[(LogInfo, "Turning on blinker")]
stateOff :: F.FsmState () Bool Env Bool
stateOff = F.FsmState "off" action
where
action :: () -> Env -> Bool -> F.FsmOutput () Bool Env Bool
action _ _ sta =
F.FsmOutput
(Just $ F.FsmResult sta True stateOn)
[(LogInfo, "Turning off blinker")]
handle ::
forall es. (GPIOEffect () :> es, Log :> es, Reader Env :> es)
=> S.Stream (Eff es) Bool
-> Eff es ()
handle = S.fold S.drain . S.mapM handler
where
handler :: Bool -> Eff es ()
handler sta = do
env <- ask @Env
toggle sta () [env.period, 0]
-- Dummy blinker service:
-- Proof of concept. This service toggles a GPIO on and off using a set
-- period.
main :: IO ()
main =
launch @Env "dummy-blinker" withoutInputEcho $ \env logger level ->
(S.repeat () & F.fsm @_ @_ @Env @Bool & handle)
& runGPIO (\() -> fromList env.gpio)
& evalState False
& evalState stateOff
& runLog env.name logger level
& runReader env
& runResource
& runEff
|
