-- | Stdout logging back-end.
module Log.Backend.StandardOutput
  ( withSimpleStdOutLogger
  , withStdOutLogger
  , withJsonStdOutLogger
  ) where

import Control.Monad.IO.Unlift
import Data.Aeson
import System.IO
import qualified Data.Text.IO as T
import qualified Data.ByteString.Lazy.Char8 as BSL

import Log.Data
import Log.Internal.Logger
import Log.Logger

withSimpleStdOutLogger :: MonadUnliftIO m => (Logger -> m r) -> m r
withSimpleStdOutLogger :: forall (m :: * -> *) r. MonadUnliftIO m => (Logger -> m r) -> m r
withSimpleStdOutLogger = forall (m :: * -> *) r. MonadUnliftIO m => (Logger -> m r) -> m r
withStdOutLogger
{-# DEPRECATED withSimpleStdOutLogger "Use withStdOutLogger instead" #-}

-- | Create a logger that prints messages to standard output for the duration of
-- the given action.
withStdOutLogger :: MonadUnliftIO m => (Logger -> m r) -> m r
withStdOutLogger :: forall (m :: * -> *) r. MonadUnliftIO m => (Logger -> m r) -> m r
withStdOutLogger Logger -> m r
act = forall (m :: * -> *) b.
MonadUnliftIO m =>
((forall a. m a -> IO a) -> IO b) -> m b
withRunInIO forall a b. (a -> b) -> a -> b
$ \forall a. m a -> IO a
unlift -> do
  Logger
logger <- Text -> (LogMessage -> IO ()) -> IO Logger
mkLogger Text
"stdout" forall a b. (a -> b) -> a -> b
$ \LogMessage
msg -> do
    Text -> IO ()
T.putStrLn forall a b. (a -> b) -> a -> b
$ Maybe UTCTime -> LogMessage -> Text
showLogMessage forall a. Maybe a
Nothing LogMessage
msg
    Handle -> IO ()
hFlush Handle
stdout
  forall r. Logger -> (Logger -> IO r) -> IO r
withLogger Logger
logger (forall a. m a -> IO a
unlift forall b c a. (b -> c) -> (a -> b) -> a -> c
. Logger -> m r
act)

-- | Create a logger that prints messages in the JSON format to standard output
-- for the duration of the given action.
withJsonStdOutLogger :: MonadUnliftIO m => (Logger -> m r) -> m r
withJsonStdOutLogger :: forall (m :: * -> *) r. MonadUnliftIO m => (Logger -> m r) -> m r
withJsonStdOutLogger Logger -> m r
act = forall (m :: * -> *) b.
MonadUnliftIO m =>
((forall a. m a -> IO a) -> IO b) -> m b
withRunInIO forall a b. (a -> b) -> a -> b
$ \forall a. m a -> IO a
unlift -> do
  Logger
logger <- Text -> (LogMessage -> IO ()) -> IO Logger
mkLogger Text
"stdout-json" forall a b. (a -> b) -> a -> b
$ \LogMessage
msg -> do
    ByteString -> IO ()
BSL.putStrLn forall a b. (a -> b) -> a -> b
$ forall a. ToJSON a => a -> ByteString
encode LogMessage
msg
    Handle -> IO ()
hFlush Handle
stdout
  forall r. Logger -> (Logger -> IO r) -> IO r
withLogger Logger
logger (forall a. m a -> IO a
unlift forall b c a. (b -> c) -> (a -> b) -> a -> c
. Logger -> m r
act)