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|
{-# LANGUAGE AllowAmbiguousTypes #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE UndecidableInstances #-}
module Hsm.Log
( Severity (Attention, Info, Trace)
, Log
, logMsg
, runLog
)
where
import Control.Monad (when)
import Data.Function (applyWhen)
import Data.Proxy (Proxy (Proxy))
import Data.Time.Clock (getCurrentTime)
import Data.Time.ISO8601 (formatISO8601Millis)
import Effectful (Dispatch (Static), DispatchOf, Eff, Effect, IOE, (:>))
import Effectful.Dispatch.Static
( SideEffects (WithSideEffects)
, StaticRep
, evalStaticRep
, getStaticRep
, unsafeEff_
)
import GHC.TypeLits (KnownSymbol, Symbol, symbolVal)
import GHC.TypeLits.Printf (printf)
import String.ANSI (red)
data Severity
= Attention
| Info
| Trace
deriving (Eq, Ord, Show)
data Log (d :: Symbol) (a :: * -> *) (b :: *)
type instance DispatchOf (Log d) = Static WithSideEffects
newtype instance StaticRep (Log d)
= Log Severity
logMsg
:: forall d es
. (KnownSymbol d, Log d :> es)
=> Severity
-> String
-> Eff es ()
logMsg severity message = do
Log level <- getStaticRep
unsafeEff_ . when (severity <= level) $ do
time <- formatISO8601Millis <$> getCurrentTime
putStrLn . applyWhen (severity == Attention) red $
printf "%s %s [%s] %s" time (symbolVal $ Proxy @d) (show level) message
runLog
:: forall d es a
. IOE :> es
=> Severity
-> Eff (Log d : es) a
-> Eff es a
runLog = evalStaticRep . Log
class Logs (ds :: [Symbol]) (es :: [Effect]) where
type Insert ds es :: [Effect]
runLogs :: Severity -> Eff (Insert ds es) a -> Eff es a
instance Logs ('[] :: [Symbol]) (es :: [Effect]) where
type Insert '[] es = es
runLogs _ = id
instance
(IOE :> Insert ds es, KnownSymbol d, Logs ds es)
=> Logs (d : ds :: [Symbol]) (es :: [Effect])
where
type Insert (d : ds) es = Log d : Insert ds es
runLogs level = runLogs @ds level . runLog @d level
|
