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|
{-# LANGUAGE AllowAmbiguousTypes #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE UndecidableInstances #-}
module Hsm.Log
( Severity (Attention, Info, Trace)
, Log
, getLevel
, logMsg
, makeLoggerIO
, LoggerOptionPrefix
, runLog
, runLogOpt
, runLogs
, runLogsOpt
)
where
import Control.Monad (when)
import Data.Function (applyWhen)
import Data.List (intercalate)
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
, unEff
, unsafeEff
, unsafeEff_
)
import GHC.Conc.Sync (fromThreadId, myThreadId)
import GHC.Records (HasField, getField)
import GHC.TypeLits (AppendSymbol, KnownSymbol, Symbol, symbolVal)
import String.ANSI (blue, green, red, white)
data Severity
= Attention
| Info
| Trace
deriving (Enum, Eq, Ord, Read, Show)
coloredShow :: Severity -> String
coloredShow Attention = red "ATTENTION"
coloredShow Info = green "INFO"
coloredShow Trace = blue "TRACE"
data Log (d :: Symbol) (a :: * -> *) (b :: *)
type instance DispatchOf (Log d) = Static WithSideEffects
newtype instance StaticRep (Log d)
= Log Severity
getLevel :: Log d :> es => Eff es Severity
getLevel = getStaticRep >>= \(Log level) -> return level
logMsg
:: forall d es
. (KnownSymbol d, Log d :> es)
=> Severity
-> String
-> Eff es ()
logMsg severity message = do
level <- getLevel
when (severity <= level) . unsafeEff_ $ do
time <- formatISO8601Millis <$> getCurrentTime
domainAndThreadId <- myThreadId >>= \tid -> return . white $ symbolVal (Proxy @d) <> ":" <> show (fromThreadId tid)
putStrLn $
unwords
[ time
, domainAndThreadId
, coloredShow severity
, applyWhen (severity == Attention) red . intercalate "\n ... " $ lines message
]
makeLoggerIO
:: forall d es
. (KnownSymbol d, Log d :> es)
=> Eff es (Severity -> String -> IO ())
makeLoggerIO = unsafeEff $ \env -> return $ \severity message -> unEff (logMsg severity message) env
type LoggerOptionPrefix = "logLevel_"
runLog
:: forall d es a
. IOE :> es
=> Severity
-> Eff (Log d : es) a
-> Eff es a
runLog = evalStaticRep . Log
runLogOpt
:: forall d f o es a
. (AppendSymbol LoggerOptionPrefix d ~ f, HasField f o Severity, IOE :> es)
=> o
-> Eff (Log d : es) a
-> Eff es a
runLogOpt = runLog . getField @f
class Logs (o :: *) (ds :: [Symbol]) (es :: [Effect]) where
type Insert ds es :: [Effect]
runLogs :: Severity -> Eff (Insert ds es) a -> Eff es a
runLogsOpt :: o -> Eff (Insert ds es) a -> Eff es a
instance Logs (o :: *) ('[] :: [Symbol]) (es :: [Effect]) where
type Insert '[] es = es
runLogs = const id
runLogsOpt = const id
instance
(AppendSymbol LoggerOptionPrefix d ~ f, HasField f o Severity, IOE :> Insert ds es, KnownSymbol d, Logs o ds es)
=> Logs (o :: *) (d : ds :: [Symbol]) (es :: [Effect])
where
type Insert (d : ds) es = Log d : Insert ds es
runLogs level = runLogs @o @ds level . runLog @d level
runLogsOpt opts = runLogsOpt @o @ds opts . runLogOpt @d @f @o opts
|
