{-# LANGUAGE BangPatterns               #-}
{-# LANGUAGE CPP                        #-}
{-# LANGUAGE FlexibleContexts           #-}
{-# LANGUAGE FlexibleInstances          #-}
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
{-# LANGUAGE ImpredicativeTypes         #-}
{-# LANGUAGE MultiParamTypeClasses      #-}
{-# LANGUAGE OverloadedStrings          #-}
{-# LANGUAGE TemplateHaskell            #-}
{-# LANGUAGE TypeFamilies               #-}

#ifndef MIN_VERSION_comonad
#define MIN_VERSION_comonad(x,y,z) 1
#endif

module Snap.Snaplet.Internal.Types where

------------------------------------------------------------------------------
import           Control.Applicative          (Alternative)
import           Control.Lens                 (ALens', makeLenses, set)
import           Control.Monad                (MonadPlus, liftM)
import           Control.Monad.Base           (MonadBase (..))
import           Control.Monad.Fail           (MonadFail)
import           Control.Monad.Reader         (MonadIO (..), MonadReader (ask, local))
import           Control.Monad.State.Class    (MonadState (get, put), gets)
import           Control.Monad.Trans.Control  (MonadBaseControl (..))
import           Control.Monad.Trans.Writer   (WriterT)
import           Data.ByteString              (ByteString)
import qualified Data.ByteString.Char8        as B (dropWhile, intercalate, null, reverse)
import           Data.Configurator.Types      (Config)
import           Data.IORef                   (IORef)
import           Data.Text                    (Text)
import           Snap.Core                    (MonadSnap, Request (rqClientAddr), Snap, bracketSnap, getRequest, pass, writeText)
import qualified Snap.Snaplet.Internal.Lensed as L (Lensed (..), runLensed, with, withTop)
import qualified Snap.Snaplet.Internal.LensT  as LT (LensT, getBase, with, withTop)

#if !MIN_VERSION_base(4,8,0)
import           Control.Applicative          (Applicative)
import           Data.Monoid                  (Monoid (mappend, mempty))
#endif

#if !MIN_VERSION_base(4,11,0)
import           Data.Semigroup               (Semigroup(..))
#endif

------------------------------------------------------------------------------


------------------------------------------------------------------------------
-- | An opaque data type holding internal snaplet configuration data.  It is
-- exported publicly because the getOpaqueConfig function in MonadSnaplet
-- makes implementing new instances of MonadSnaplet more convenient.
data SnapletConfig = SnapletConfig
    { SnapletConfig -> [Text]
_scAncestry        :: [Text]
    , SnapletConfig -> FilePath
_scFilePath        :: FilePath
    , SnapletConfig -> Maybe Text
_scId              :: Maybe Text
    , SnapletConfig -> Text
_scDescription     :: Text
    , SnapletConfig -> Config
_scUserConfig      :: Config
    , SnapletConfig -> [ByteString]
_scRouteContext    :: [ByteString]
    , SnapletConfig -> Maybe ByteString
_scRoutePattern    :: Maybe ByteString
        -- ^ Holds the actual route pattern passed to addRoutes for the
        -- current handler.  Nothing during initialization and before route
        -- dispatech.
    , SnapletConfig -> IO (Either Text Text)
_reloader          :: IO (Either Text Text) -- might change
        -- ^ This is the universal reload action for the top-level site.  We
        -- can't update this in place to be a reloader for each individual
        -- snaplet because individual snaplets can't be reloaded in isolation
        -- without losing effects that subsequent hooks may have had.
    }

makeLenses ''SnapletConfig


------------------------------------------------------------------------------
-- | Joins a reversed list of directories into a path.
buildPath :: [ByteString] -> ByteString
buildPath :: [ByteString] -> ByteString
buildPath [ByteString]
ps = ByteString -> [ByteString] -> ByteString
B.intercalate ByteString
"/" forall a b. (a -> b) -> a -> b
$ forall a. (a -> Bool) -> [a] -> [a]
filter (Bool -> Bool
not forall b c a. (b -> c) -> (a -> b) -> a -> c
. ByteString -> Bool
B.null) forall a b. (a -> b) -> a -> b
$ forall a. [a] -> [a]
reverse [ByteString]
ps


------------------------------------------------------------------------------
-- | Joins a reversed list of directories into a path.
getRootURL :: SnapletConfig -> ByteString
getRootURL :: SnapletConfig -> ByteString
getRootURL SnapletConfig
sc = [ByteString] -> ByteString
buildPath forall a b. (a -> b) -> a -> b
$ SnapletConfig -> [ByteString]
_scRouteContext SnapletConfig
sc


------------------------------------------------------------------------------
-- | Snaplet's type parameter 's' here is user-defined and can be any Haskell
-- type.  A value of type @Snaplet s@ countains a couple of things:
--
-- * a value of type @s@, called the \"user state\".
--
-- * some bookkeeping data the framework uses to plug things together, like
--   the snaplet's configuration, the snaplet's root directory on the
--   filesystem, the snaplet's root URL, and so on.
data Snaplet s = Snaplet
    { forall s. Snaplet s -> SnapletConfig
_snapletConfig   :: SnapletConfig
    , forall s. Snaplet s -> s -> IO ()
_snapletModifier :: s -> IO ()
        -- ^ See the _reloader comment for why we have to use this to reload
        -- single snaplets in isolation.  This action won't actually run the
        -- initializer at all.  It will only modify the existing state.  It is
        -- the responsibility of the snaplet author to avoid using this in
        -- situations where it will destroy data in its state that was created
        -- by subsequent hook actions.
    , forall s. Snaplet s -> s
_snapletValue    :: s
    }

makeLenses ''Snaplet

--instance Functor Snaplet where
--  fmap f (Snaplet c r a) = Snaplet c r (f a)
--
--instance Foldable Snaplet where
--  foldMap f (Snaplet _ _ a) = f a
--
--instance Traversable Snaplet where
--  traverse f (Snaplet c r a) = Snaplet c r <$> f a
--
--instance Comonad Snaplet where
--  extract (Snaplet _ _ a) = a
--
-- #if !(MIN_VERSION_comonad(3,0,0))
-- instance Extend Snaplet where
-- #endif
--   extend f w@(Snaplet c r _) = Snaplet c r (f w)

{-
------------------------------------------------------------------------------
-- | A lens referencing the opaque SnapletConfig data type held inside
-- Snaplet.
snapletConfig :: SimpleLens (Snaplet a) SnapletConfig


------------------------------------------------------------------------------
-- | A lens referencing the user-defined state type wrapped by a Snaplet.
snapletValue :: SimpleLens (Snaplet a) a
-}


-- NOTE: We cannot use one of the smaller lens packages because none of them
-- include ALens'.  We have to use ALens' because we use lenses inside f's...
-- f (Lens a b).  That requires ImpredicativeTypes which doesn't work.  We
-- also can't inline the type aliases because ALens' uses Pretext which is a
-- newtype and can't be supplied outside lens in a compatible way.

------------------------------------------------------------------------------
type SnapletLens s a = ALens' s (Snaplet a)


------------------------------------------------------------------------------
-- | Transforms a lens of the type you get from makeLenses to an similar lens
-- that is more suitable for internal use.
subSnaplet :: SnapletLens a b
           -> SnapletLens (Snaplet a) b
subSnaplet :: forall a b. SnapletLens a b -> SnapletLens (Snaplet a) b
subSnaplet SnapletLens a b
l = forall s. Lens' (Snaplet s) s
snapletValue forall b c a. (b -> c) -> (a -> b) -> a -> c
. SnapletLens a b
l


------------------------------------------------------------------------------
-- | The m type parameter used in the MonadSnaplet type signatures will
-- usually be either Initializer or Handler, but other monads may sometimes be
-- useful.
--
-- Minimal complete definition:
--
-- * 'withTop'', 'with'', 'getLens', and 'getOpaqueConfig'.
--
class MonadSnaplet m where
    -- | Runs a child snaplet action in the current snaplet's context.  If you
    -- think about snaplet lenses using a filesystem path metaphor, the lens
    -- supplied to this snaplet must be a relative path.  In other words, the
    -- lens's base state must be the same as the current snaplet.
    with :: SnapletLens v v'
             -- ^ A relative lens identifying a snaplet
         -> m b v' a
             -- ^ Action from the lense's snaplet
         -> m b v a
    with SnapletLens v v'
l = forall (m :: * -> * -> * -> *) v v' b a.
MonadSnaplet m =>
SnapletLens (Snaplet v) v' -> m b v' a -> m b v a
with' (forall a b. SnapletLens a b -> SnapletLens (Snaplet a) b
subSnaplet SnapletLens v v'
l)

    -- | Like 'with' but doesn't impose the requirement that the action
    -- being run be a descendant of the current snaplet.  Using our filesystem
    -- metaphor again, the lens for this function must be an absolute
    -- path--it's base must be the same as the current base.
    withTop :: SnapletLens b v'
                -- ^ An \"absolute\" lens identifying a snaplet
            -> m b v' a
                -- ^ Action from the lense's snaplet
            -> m b v a
    withTop SnapletLens b v'
l = forall (m :: * -> * -> * -> *) b v' a v.
MonadSnaplet m =>
SnapletLens (Snaplet b) v' -> m b v' a -> m b v a
withTop' (forall a b. SnapletLens a b -> SnapletLens (Snaplet a) b
subSnaplet SnapletLens b v'
l)

    -- | A variant of 'with' accepting a lens from snaplet to snaplet.  Unlike
    -- the lens used in the above 'with' function, this lens formulation has
    -- an identity, which makes it useful in certain circumstances.  The
    -- lenses generated by 'makeLenses' will not work with this function,
    -- however the lens returned by 'getLens' will.
    --
    -- @with = with' . subSnaplet@
    with' :: SnapletLens (Snaplet v) v'
          -> m b v' a -> m b v a

    -- Not providing a definition for this function in terms of withTop'
    -- allows us to avoid extra Monad type class constraints, making the type
    -- signature easier to read.
    -- with' l m = flip withTop m . (l .) =<< getLens

    -- | The absolute version of 'with''
    withTop' :: SnapletLens (Snaplet b) v'
             -> m b v' a -> m b v a

    -- | Gets the lens for the current snaplet.
    getLens :: m b v (SnapletLens (Snaplet b) v)

    -- | Gets the current snaplet's opaque config data type.  You'll only use
    -- this function when writing MonadSnaplet instances.
    getOpaqueConfig :: m b v SnapletConfig
    -- NOTE: We can't just use a MonadState (Snaplet v) instance for this
    -- because Initializer has SnapletConfig, but doesn't have a full Snaplet.


------------------------------------------------------------------------------
-- | Gets a list of the names of snaplets that are direct ancestors of the
-- current snaplet.
getSnapletAncestry :: (Monad (m b v), MonadSnaplet m) => m b v [Text]
getSnapletAncestry :: forall (m :: * -> * -> * -> *) b v.
(Monad (m b v), MonadSnaplet m) =>
m b v [Text]
getSnapletAncestry = forall (m :: * -> *) a. Monad m => a -> m a
return forall b c a. (b -> c) -> (a -> b) -> a -> c
. SnapletConfig -> [Text]
_scAncestry forall (m :: * -> *) a b. Monad m => (a -> m b) -> m a -> m b
=<< forall (m :: * -> * -> * -> *) b v.
MonadSnaplet m =>
m b v SnapletConfig
getOpaqueConfig


------------------------------------------------------------------------------
-- | Gets the snaplet's path on the filesystem.
getSnapletFilePath :: (Monad (m b v), MonadSnaplet m) => m b v FilePath
getSnapletFilePath :: forall (m :: * -> * -> * -> *) b v.
(Monad (m b v), MonadSnaplet m) =>
m b v FilePath
getSnapletFilePath = forall (m :: * -> *) a. Monad m => a -> m a
return forall b c a. (b -> c) -> (a -> b) -> a -> c
. SnapletConfig -> FilePath
_scFilePath forall (m :: * -> *) a b. Monad m => (a -> m b) -> m a -> m b
=<< forall (m :: * -> * -> * -> *) b v.
MonadSnaplet m =>
m b v SnapletConfig
getOpaqueConfig


------------------------------------------------------------------------------
-- | Gets the current snaple's name.
getSnapletName :: (Monad (m b v), MonadSnaplet m) => m b v (Maybe Text)
getSnapletName :: forall (m :: * -> * -> * -> *) b v.
(Monad (m b v), MonadSnaplet m) =>
m b v (Maybe Text)
getSnapletName = forall (m :: * -> *) a. Monad m => a -> m a
return forall b c a. (b -> c) -> (a -> b) -> a -> c
. SnapletConfig -> Maybe Text
_scId forall (m :: * -> *) a b. Monad m => (a -> m b) -> m a -> m b
=<< forall (m :: * -> * -> * -> *) b v.
MonadSnaplet m =>
m b v SnapletConfig
getOpaqueConfig


------------------------------------------------------------------------------
-- | Gets a human readable description of the snaplet.
getSnapletDescription :: (Monad (m b v), MonadSnaplet m) => m b v Text
getSnapletDescription :: forall (m :: * -> * -> * -> *) b v.
(Monad (m b v), MonadSnaplet m) =>
m b v Text
getSnapletDescription = forall (m :: * -> *) a. Monad m => a -> m a
return forall b c a. (b -> c) -> (a -> b) -> a -> c
. SnapletConfig -> Text
_scDescription forall (m :: * -> *) a b. Monad m => (a -> m b) -> m a -> m b
=<< forall (m :: * -> * -> * -> *) b v.
MonadSnaplet m =>
m b v SnapletConfig
getOpaqueConfig


------------------------------------------------------------------------------
-- | Gets the config data structure for the current snaplet.
getSnapletUserConfig :: (Monad (m b v), MonadSnaplet m) => m b v Config
getSnapletUserConfig :: forall (m :: * -> * -> * -> *) b v.
(Monad (m b v), MonadSnaplet m) =>
m b v Config
getSnapletUserConfig = forall (m :: * -> *) a. Monad m => a -> m a
return forall b c a. (b -> c) -> (a -> b) -> a -> c
. SnapletConfig -> Config
_scUserConfig forall (m :: * -> *) a b. Monad m => (a -> m b) -> m a -> m b
=<< forall (m :: * -> * -> * -> *) b v.
MonadSnaplet m =>
m b v SnapletConfig
getOpaqueConfig


------------------------------------------------------------------------------
-- | Gets the base URL for the current snaplet.  Directories get added to
-- the current snaplet path by calls to 'nestSnaplet'.
getSnapletRootURL :: (Monad (m b v), MonadSnaplet m) => m b v ByteString
getSnapletRootURL :: forall (m :: * -> * -> * -> *) b v.
(Monad (m b v), MonadSnaplet m) =>
m b v ByteString
getSnapletRootURL = forall (m :: * -> *) a1 r. Monad m => (a1 -> r) -> m a1 -> m r
liftM SnapletConfig -> ByteString
getRootURL forall (m :: * -> * -> * -> *) b v.
MonadSnaplet m =>
m b v SnapletConfig
getOpaqueConfig


------------------------------------------------------------------------------
-- | Constructs a url relative to the current snaplet.
snapletURL :: (Monad (m b v), MonadSnaplet m)
           => ByteString -> m b v ByteString
snapletURL :: forall (m :: * -> * -> * -> *) b v.
(Monad (m b v), MonadSnaplet m) =>
ByteString -> m b v ByteString
snapletURL ByteString
suffix = do
    SnapletConfig
cfg <- forall (m :: * -> * -> * -> *) b v.
MonadSnaplet m =>
m b v SnapletConfig
getOpaqueConfig
    forall (m :: * -> *) a. Monad m => a -> m a
return forall a b. (a -> b) -> a -> b
$ [ByteString] -> ByteString
buildPath (ByteString
cleanSuffix forall a. a -> [a] -> [a]
: SnapletConfig -> [ByteString]
_scRouteContext SnapletConfig
cfg)
  where
    dropSlash :: ByteString -> ByteString
dropSlash = (Char -> Bool) -> ByteString -> ByteString
B.dropWhile (forall a. Eq a => a -> a -> Bool
==Char
'/')
    cleanSuffix :: ByteString
cleanSuffix = ByteString -> ByteString
B.reverse forall a b. (a -> b) -> a -> b
$ ByteString -> ByteString
dropSlash forall a b. (a -> b) -> a -> b
$ ByteString -> ByteString
B.reverse forall a b. (a -> b) -> a -> b
$ ByteString -> ByteString
dropSlash ByteString
suffix


------------------------------------------------------------------------------
-- | Snaplet infrastructure is available during runtime request processing
-- through the Handler monad.  There aren't very many standalone functions to
-- read about here, but this is deceptive.  The key is in the type class
-- instances.  Handler is an instance of 'MonadSnap', which means it is the
-- monad you will use to write all your application routes.  It also has a
-- 'MonadSnaplet' instance, which gives you all the functionality described
-- above.
newtype Handler b v a =
    Handler { forall b v a.
Handler b v a -> Lensed (Snaplet b) (Snaplet v) Snap a
_unHandler :: L.Lensed (Snaplet b) (Snaplet v) Snap a }
  deriving ( forall a. a -> Handler b v a
forall {b} {v}. Applicative (Handler b v)
forall a b. Handler b v a -> Handler b v b -> Handler b v b
forall a b. Handler b v a -> (a -> Handler b v b) -> Handler b v b
forall b v a. a -> Handler b v a
forall b v a b. Handler b v a -> Handler b v b -> Handler b v b
forall b v a b.
Handler b v a -> (a -> Handler b v b) -> Handler b v b
forall (m :: * -> *).
Applicative m
-> (forall a b. m a -> (a -> m b) -> m b)
-> (forall a b. m a -> m b -> m b)
-> (forall a. a -> m a)
-> Monad m
return :: forall a. a -> Handler b v a
$creturn :: forall b v a. a -> Handler b v a
>> :: forall a b. Handler b v a -> Handler b v b -> Handler b v b
$c>> :: forall b v a b. Handler b v a -> Handler b v b -> Handler b v b
>>= :: forall a b. Handler b v a -> (a -> Handler b v b) -> Handler b v b
$c>>= :: forall b v a b.
Handler b v a -> (a -> Handler b v b) -> Handler b v b
Monad
           , forall a b. a -> Handler b v b -> Handler b v a
forall a b. (a -> b) -> Handler b v a -> Handler b v b
forall b v a b. a -> Handler b v b -> Handler b v a
forall b v a b. (a -> b) -> Handler b v a -> Handler b v b
forall (f :: * -> *).
(forall a b. (a -> b) -> f a -> f b)
-> (forall a b. a -> f b -> f a) -> Functor f
<$ :: forall a b. a -> Handler b v b -> Handler b v a
$c<$ :: forall b v a b. a -> Handler b v b -> Handler b v a
fmap :: forall a b. (a -> b) -> Handler b v a -> Handler b v b
$cfmap :: forall b v a b. (a -> b) -> Handler b v a -> Handler b v b
Functor
           , forall a. a -> Handler b v a
forall b v. Functor (Handler b v)
forall a b. Handler b v a -> Handler b v b -> Handler b v a
forall a b. Handler b v a -> Handler b v b -> Handler b v b
forall a b. Handler b v (a -> b) -> Handler b v a -> Handler b v b
forall b v a. a -> Handler b v a
forall a b c.
(a -> b -> c) -> Handler b v a -> Handler b v b -> Handler b v c
forall b v a b. Handler b v a -> Handler b v b -> Handler b v a
forall b v a b. Handler b v a -> Handler b v b -> Handler b v b
forall b v a b.
Handler b v (a -> b) -> Handler b v a -> Handler b v b
forall b v a b c.
(a -> b -> c) -> Handler b v a -> Handler b v b -> Handler b v c
forall (f :: * -> *).
Functor f
-> (forall a. a -> f a)
-> (forall a b. f (a -> b) -> f a -> f b)
-> (forall a b c. (a -> b -> c) -> f a -> f b -> f c)
-> (forall a b. f a -> f b -> f b)
-> (forall a b. f a -> f b -> f a)
-> Applicative f
<* :: forall a b. Handler b v a -> Handler b v b -> Handler b v a
$c<* :: forall b v a b. Handler b v a -> Handler b v b -> Handler b v a
*> :: forall a b. Handler b v a -> Handler b v b -> Handler b v b
$c*> :: forall b v a b. Handler b v a -> Handler b v b -> Handler b v b
liftA2 :: forall a b c.
(a -> b -> c) -> Handler b v a -> Handler b v b -> Handler b v c
$cliftA2 :: forall b v a b c.
(a -> b -> c) -> Handler b v a -> Handler b v b -> Handler b v c
<*> :: forall a b. Handler b v (a -> b) -> Handler b v a -> Handler b v b
$c<*> :: forall b v a b.
Handler b v (a -> b) -> Handler b v a -> Handler b v b
pure :: forall a. a -> Handler b v a
$cpure :: forall b v a. a -> Handler b v a
Applicative
           , forall a. FilePath -> Handler b v a
forall b v. Monad (Handler b v)
forall b v a. FilePath -> Handler b v a
forall (m :: * -> *).
Monad m -> (forall a. FilePath -> m a) -> MonadFail m
fail :: forall a. FilePath -> Handler b v a
$cfail :: forall b v a. FilePath -> Handler b v a
MonadFail
           , forall a. IO a -> Handler b v a
forall b v. Monad (Handler b v)
forall b v a. IO a -> Handler b v a
forall (m :: * -> *).
Monad m -> (forall a. IO a -> m a) -> MonadIO m
liftIO :: forall a. IO a -> Handler b v a
$cliftIO :: forall b v a. IO a -> Handler b v a
MonadIO
           , forall a. Handler b v a
forall a. Handler b v a -> Handler b v a -> Handler b v a
forall b v. Monad (Handler b v)
forall {b} {v}. Alternative (Handler b v)
forall b v a. Handler b v a
forall b v a. Handler b v a -> Handler b v a -> Handler b v a
forall (m :: * -> *).
Alternative m
-> Monad m
-> (forall a. m a)
-> (forall a. m a -> m a -> m a)
-> MonadPlus m
mplus :: forall a. Handler b v a -> Handler b v a -> Handler b v a
$cmplus :: forall b v a. Handler b v a -> Handler b v a -> Handler b v a
mzero :: forall a. Handler b v a
$cmzero :: forall b v a. Handler b v a
MonadPlus
           , forall a. Handler b v a
forall a. Handler b v a -> Handler b v [a]
forall a. Handler b v a -> Handler b v a -> Handler b v a
forall {b} {v}. Applicative (Handler b v)
forall b v a. Handler b v a
forall b v a. Handler b v a -> Handler b v [a]
forall b v a. Handler b v a -> Handler b v a -> Handler b v a
forall (f :: * -> *).
Applicative f
-> (forall a. f a)
-> (forall a. f a -> f a -> f a)
-> (forall a. f a -> f [a])
-> (forall a. f a -> f [a])
-> Alternative f
many :: forall a. Handler b v a -> Handler b v [a]
$cmany :: forall b v a. Handler b v a -> Handler b v [a]
some :: forall a. Handler b v a -> Handler b v [a]
$csome :: forall b v a. Handler b v a -> Handler b v [a]
<|> :: forall a. Handler b v a -> Handler b v a -> Handler b v a
$c<|> :: forall b v a. Handler b v a -> Handler b v a -> Handler b v a
empty :: forall a. Handler b v a
$cempty :: forall b v a. Handler b v a
Alternative
           , forall a. Snap a -> Handler b v a
forall b v. Monad (Handler b v)
forall b v. Functor (Handler b v)
forall {b} {v}. Applicative (Handler b v)
forall {b} {v}. Alternative (Handler b v)
forall b v. MonadPlus (Handler b v)
forall b v. MonadIO (Handler b v)
forall {b} {v}. MonadBaseControl IO (Handler b v)
forall b v a. Snap a -> Handler b v a
forall (m :: * -> *).
Monad m
-> MonadIO m
-> MonadBaseControl IO m
-> MonadPlus m
-> Functor m
-> Applicative m
-> Alternative m
-> (forall a. Snap a -> m a)
-> MonadSnap m
liftSnap :: forall a. Snap a -> Handler b v a
$cliftSnap :: forall b v a. Snap a -> Handler b v a
MonadSnap)


------------------------------------------------------------------------------
instance MonadBase IO (Handler b v) where
    liftBase :: forall α. IO α -> Handler b v α
liftBase = forall (m :: * -> *) a. MonadIO m => IO a -> m a
liftIO


------------------------------------------------------------------------------
newtype StMHandler b v a = StMHandler {
      forall b v a.
StMHandler b v a -> StM (Lensed (Snaplet b) (Snaplet v) Snap) a
unStMHandler :: StM (L.Lensed (Snaplet b) (Snaplet v) Snap) a
    }


instance MonadBaseControl IO (Handler b v) where
    type StM (Handler b v) a = StMHandler b v a
    liftBaseWith :: forall a. (RunInBase (Handler b v) IO -> IO a) -> Handler b v a
liftBaseWith RunInBase (Handler b v) IO -> IO a
f = forall b v a.
Lensed (Snaplet b) (Snaplet v) Snap a -> Handler b v a
Handler
                       forall a b. (a -> b) -> a -> b
$ forall (b :: * -> *) (m :: * -> *) a.
MonadBaseControl b m =>
(RunInBase m b -> b a) -> m a
liftBaseWith
                       forall a b. (a -> b) -> a -> b
$ \RunInBase (Lensed (Snaplet b) (Snaplet v) Snap) IO
g' -> RunInBase (Handler b v) IO -> IO a
f
                       forall a b. (a -> b) -> a -> b
$ \Handler b v a
m -> forall (m :: * -> *) a1 r. Monad m => (a1 -> r) -> m a1 -> m r
liftM forall b v a.
StM (Lensed (Snaplet b) (Snaplet v) Snap) a -> StMHandler b v a
StMHandler
                       forall a b. (a -> b) -> a -> b
$ RunInBase (Lensed (Snaplet b) (Snaplet v) Snap) IO
g' forall a b. (a -> b) -> a -> b
$ forall b v a.
Handler b v a -> Lensed (Snaplet b) (Snaplet v) Snap a
_unHandler Handler b v a
m
    restoreM :: forall a. StM (Handler b v) a -> Handler b v a
restoreM = forall b v a.
Lensed (Snaplet b) (Snaplet v) Snap a -> Handler b v a
Handler forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall (b :: * -> *) (m :: * -> *) a.
MonadBaseControl b m =>
StM m a -> m a
restoreM forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall b v a.
StMHandler b v a -> StM (Lensed (Snaplet b) (Snaplet v) Snap) a
unStMHandler


------------------------------------------------------------------------------
-- | Gets the @Snaplet v@ from the current snaplet's state.
getSnapletState :: Handler b v (Snaplet v)
getSnapletState :: forall b v. Handler b v (Snaplet v)
getSnapletState = forall b v a.
Lensed (Snaplet b) (Snaplet v) Snap a -> Handler b v a
Handler forall s (m :: * -> *). MonadState s m => m s
get


------------------------------------------------------------------------------
-- | Puts a new @Snaplet v@ in the current snaplet's state.
putSnapletState :: Snaplet v -> Handler b v ()
putSnapletState :: forall v b. Snaplet v -> Handler b v ()
putSnapletState = forall b v a.
Lensed (Snaplet b) (Snaplet v) Snap a -> Handler b v a
Handler forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall s (m :: * -> *). MonadState s m => s -> m ()
put


------------------------------------------------------------------------------
-- | Modifies the @Snaplet v@ in the current snaplet's state.
modifySnapletState :: (Snaplet v -> Snaplet v) -> Handler b v ()
modifySnapletState :: forall v b. (Snaplet v -> Snaplet v) -> Handler b v ()
modifySnapletState Snaplet v -> Snaplet v
f = do
    Snaplet v
s <- forall b v. Handler b v (Snaplet v)
getSnapletState
    forall v b. Snaplet v -> Handler b v ()
putSnapletState (Snaplet v -> Snaplet v
f Snaplet v
s)


------------------------------------------------------------------------------
-- | Gets the @Snaplet v@ from the current snaplet's state and applies a
-- function to it.
getsSnapletState :: (Snaplet v -> b) -> Handler b1 v b
getsSnapletState :: forall v b b1. (Snaplet v -> b) -> Handler b1 v b
getsSnapletState Snaplet v -> b
f = do
    Snaplet v
s <- forall b v. Handler b v (Snaplet v)
getSnapletState
    forall (m :: * -> *) a. Monad m => a -> m a
return (Snaplet v -> b
f Snaplet v
s)


------------------------------------------------------------------------------
-- | Lets you access the current snaplet's state through the 'MonadState'
-- interface.
instance MonadState v (Handler b v) where
    get :: Handler b v v
get = forall v b b1. (Snaplet v -> b) -> Handler b1 v b
getsSnapletState forall s. Snaplet s -> s
_snapletValue
    put :: v -> Handler b v ()
put v
v = forall v b. (Snaplet v -> Snaplet v) -> Handler b v ()
modifySnapletState (forall s t a b. ASetter s t a b -> b -> s -> t
set forall s. Lens' (Snaplet s) s
snapletValue v
v)


------------------------------------------------------------------------------
-- | Lets you access the current snaplet's state through the 'MonadReader'
-- interface.
instance MonadReader v (Handler b v) where
    ask :: Handler b v v
ask = forall v b b1. (Snaplet v -> b) -> Handler b1 v b
getsSnapletState forall s. Snaplet s -> s
_snapletValue
    local :: forall a. (v -> v) -> Handler b v a -> Handler b v a
local v -> v
f Handler b v a
m = do
        v
cur <- forall r (m :: * -> *). MonadReader r m => m r
ask
        forall s (m :: * -> *). MonadState s m => s -> m ()
put (v -> v
f v
cur)
        a
res <- Handler b v a
m
        forall s (m :: * -> *). MonadState s m => s -> m ()
put v
cur
        forall (m :: * -> *) a. Monad m => a -> m a
return a
res


------------------------------------------------------------------------------
instance MonadSnaplet Handler where
    getLens :: forall b v. Handler b v (SnapletLens (Snaplet b) v)
getLens = forall b v a.
Lensed (Snaplet b) (Snaplet v) Snap a -> Handler b v a
Handler forall r (m :: * -> *). MonadReader r m => m r
ask
    with' :: forall v v' b a.
SnapletLens (Snaplet v) v' -> Handler b v' a -> Handler b v a
with' !SnapletLens (Snaplet v) v'
l (Handler !Lensed (Snaplet b) (Snaplet v') Snap a
m) = forall b v a.
Lensed (Snaplet b) (Snaplet v) Snap a -> Handler b v a
Handler forall a b. (a -> b) -> a -> b
$ forall (m :: * -> *) v v' b a.
Monad m =>
ALens' v v' -> Lensed b v' m a -> Lensed b v m a
L.with SnapletLens (Snaplet v) v'
l Lensed (Snaplet b) (Snaplet v') Snap a
m
    withTop' :: forall b v' a v.
SnapletLens (Snaplet b) v' -> Handler b v' a -> Handler b v a
withTop' !SnapletLens (Snaplet b) v'
l (Handler Lensed (Snaplet b) (Snaplet v') Snap a
m) = forall b v a.
Lensed (Snaplet b) (Snaplet v) Snap a -> Handler b v a
Handler forall a b. (a -> b) -> a -> b
$ forall (m :: * -> *) b v' a v.
Monad m =>
ALens' b v' -> Lensed b v' m a -> Lensed b v m a
L.withTop SnapletLens (Snaplet b) v'
l Lensed (Snaplet b) (Snaplet v') Snap a
m
    getOpaqueConfig :: forall b v. Handler b v SnapletConfig
getOpaqueConfig = forall b v a.
Lensed (Snaplet b) (Snaplet v) Snap a -> Handler b v a
Handler forall a b. (a -> b) -> a -> b
$ forall s (m :: * -> *) a. MonadState s m => (s -> a) -> m a
gets forall s. Snaplet s -> SnapletConfig
_snapletConfig


------------------------------------------------------------------------------
-- | Like 'runBase', but it doesn't require an MVar to be executed.
runPureBase :: Handler b b a -> Snaplet b -> Snap a
runPureBase :: forall b a. Handler b b a -> Snaplet b -> Snap a
runPureBase (Handler Lensed (Snaplet b) (Snaplet b) Snap a
m) Snaplet b
b = do
        (!a
a, Snaplet b
_) <- forall (m :: * -> *) t1 b t.
Monad m =>
Lensed t1 b m t -> ALens' t1 b -> t1 -> m (t, t1)
L.runLensed Lensed (Snaplet b) (Snaplet b) Snap a
m forall a. a -> a
id Snaplet b
b
        forall (m :: * -> *) a. Monad m => a -> m a
return forall a b. (a -> b) -> a -> b
$! a
a


------------------------------------------------------------------------------
-- | Gets the route pattern that matched for the handler.  This lets you find
-- out exactly which of the strings you used in addRoutes matched.
getRoutePattern :: Handler b v (Maybe ByteString)
getRoutePattern :: forall b v. Handler b v (Maybe ByteString)
getRoutePattern =
    forall (m :: * -> * -> * -> *) b v' a v.
MonadSnaplet m =>
SnapletLens (Snaplet b) v' -> m b v' a -> m b v a
withTop' forall a. a -> a
id forall a b. (a -> b) -> a -> b
$ forall (m :: * -> *) a1 r. Monad m => (a1 -> r) -> m a1 -> m r
liftM SnapletConfig -> Maybe ByteString
_scRoutePattern forall (m :: * -> * -> * -> *) b v.
MonadSnaplet m =>
m b v SnapletConfig
getOpaqueConfig


------------------------------------------------------------------------------
-- | Sets the route pattern that matched for the handler.  Use this when to
-- override the default pattern which is the key to the alist passed to
-- addRoutes.
setRoutePattern :: ByteString -> Handler b v ()
setRoutePattern :: forall b v. ByteString -> Handler b v ()
setRoutePattern ByteString
p = forall (m :: * -> * -> * -> *) b v' a v.
MonadSnaplet m =>
SnapletLens (Snaplet b) v' -> m b v' a -> m b v a
withTop' forall a. a -> a
id forall a b. (a -> b) -> a -> b
$
    forall v b. (Snaplet v -> Snaplet v) -> Handler b v ()
modifySnapletState (forall s t a b. ASetter s t a b -> b -> s -> t
set (forall s. Lens' (Snaplet s) SnapletConfig
snapletConfig forall b c a. (b -> c) -> (a -> b) -> a -> c
. Lens' SnapletConfig (Maybe ByteString)
scRoutePattern) (forall a. a -> Maybe a
Just ByteString
p))


------------------------------------------------------------------------------
-- | Check whether the request comes from localhost.
isLocalhost :: MonadSnap m => m Bool
isLocalhost :: forall (m :: * -> *). MonadSnap m => m Bool
isLocalhost = do
    ByteString
rip <- forall (m :: * -> *) a1 r. Monad m => (a1 -> r) -> m a1 -> m r
liftM Request -> ByteString
rqClientAddr forall (m :: * -> *). MonadSnap m => m Request
getRequest
    forall (m :: * -> *) a. Monad m => a -> m a
return forall a b. (a -> b) -> a -> b
$ forall (t :: * -> *) a. (Foldable t, Eq a) => a -> t a -> Bool
elem ByteString
rip [ ByteString
"127.0.0.1"
                      , ByteString
"localhost"
                      , ByteString
"::1" ]


------------------------------------------------------------------------------
-- | Pass if the request is not coming from localhost.
failIfNotLocal :: MonadSnap m => m b -> m b
failIfNotLocal :: forall (m :: * -> *) b. MonadSnap m => m b -> m b
failIfNotLocal m b
m = do
    Bool
isLocal <- forall (m :: * -> *). MonadSnap m => m Bool
isLocalhost
    if Bool
isLocal then m b
m else forall (m :: * -> *) a. MonadSnap m => m a
pass


------------------------------------------------------------------------------
-- | Handler that reloads the site.
reloadSite :: Handler b v ()
reloadSite :: forall b v. Handler b v ()
reloadSite = forall (m :: * -> *) b. MonadSnap m => m b -> m b
failIfNotLocal forall a b. (a -> b) -> a -> b
$ do
    SnapletConfig
cfg <- forall (m :: * -> * -> * -> *) b v.
MonadSnaplet m =>
m b v SnapletConfig
getOpaqueConfig
    !Either Text Text
res <- forall (m :: * -> *) a. MonadIO m => IO a -> m a
liftIO forall a b. (a -> b) -> a -> b
$ SnapletConfig -> IO (Either Text Text)
_reloader SnapletConfig
cfg
    forall a c b. (a -> c) -> (b -> c) -> Either a b -> c
either forall {m :: * -> *}. MonadSnap m => Text -> m ()
bad forall {m :: * -> *}. MonadSnap m => Text -> m ()
good Either Text Text
res
  where
    bad :: Text -> m ()
bad Text
msg = do
        forall {m :: * -> *}. MonadSnap m => Text -> m ()
writeText forall a b. (a -> b) -> a -> b
$ Text
"Error reloading site!\n\n"
        forall {m :: * -> *}. MonadSnap m => Text -> m ()
writeText Text
msg
    good :: Text -> m ()
good Text
msg = do
        forall {m :: * -> *}. MonadSnap m => Text -> m ()
writeText Text
msg
        forall {m :: * -> *}. MonadSnap m => Text -> m ()
writeText forall a b. (a -> b) -> a -> b
$ Text
"Site successfully reloaded.\n"


------------------------------------------------------------------------------
-- | This function brackets a Handler action in resource acquisition and
-- release.  Like 'bracketSnap',  this is provided because MonadCatchIO's
-- 'bracket' function doesn't work properly in the case of a short-circuit
-- return from the action being bracketed.
--
-- In order to prevent confusion regarding the effects of the
-- aquisition and release actions on the Handler state, this function
-- doesn't accept Handler actions for the acquire or release actions.
--
-- This function will run the release action in all cases where the
-- acquire action succeeded.  This includes the following behaviors
-- from the bracketed Snap action.
--
-- 1. Normal completion
--
-- 2. Short-circuit completion, either from calling 'fail' or 'finishWith'
--
-- 3. An exception being thrown.
bracketHandler :: IO a -> (a -> IO x) -> (a -> Handler b v c) -> Handler b v c
bracketHandler :: forall a x b v c.
IO a -> (a -> IO x) -> (a -> Handler b v c) -> Handler b v c
bracketHandler IO a
begin a -> IO x
end a -> Handler b v c
f = forall b v a.
Lensed (Snaplet b) (Snaplet v) Snap a -> Handler b v a
Handler forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall b v (m :: * -> *) a.
(ALens' b v -> v -> b -> m (a, v, b)) -> Lensed b v m a
L.Lensed forall a b. (a -> b) -> a -> b
$ \ALens' (Snaplet b) (Snaplet v)
l Snaplet v
v Snaplet b
b -> do
    forall a b c. IO a -> (a -> IO b) -> (a -> Snap c) -> Snap c
bracketSnap IO a
begin a -> IO x
end forall a b. (a -> b) -> a -> b
$ \a
a -> case a -> Handler b v c
f a
a of Handler Lensed (Snaplet b) (Snaplet v) Snap c
m -> forall b v (m :: * -> *) a.
Lensed b v m a -> ALens' b v -> v -> b -> m (a, v, b)
L.unlensed Lensed (Snaplet b) (Snaplet v) Snap c
m ALens' (Snaplet b) (Snaplet v)
l Snaplet v
v Snaplet b
b


------------------------------------------------------------------------------
-- | Information about a partially constructed initializer.  Used to
-- automatically aggregate handlers and cleanup actions.
data InitializerState b = InitializerState
    { forall b. InitializerState b -> Bool
_isTopLevel      :: Bool
    , forall b. InitializerState b -> IORef (IO ())
_cleanup         :: IORef (IO ())
    , forall b. InitializerState b -> [(ByteString, Handler b b ())]
_handlers        :: [(ByteString, Handler b b ())]
        -- ^ Handler routes built up and passed to route.
    , forall b. InitializerState b -> Handler b b () -> Handler b b ()
_hFilter         :: Handler b b () -> Handler b b ()
        -- ^ Generic filtering of handlers
    , forall b. InitializerState b -> SnapletConfig
_curConfig       :: SnapletConfig
        -- ^ This snaplet config is the incrementally built config for
        -- whatever snaplet is currently being constructed.
    , forall b. InitializerState b -> IORef Text
_initMessages    :: IORef Text
    , forall b. InitializerState b -> FilePath
_environment     :: String
    , forall b. InitializerState b -> (Snaplet b -> Snaplet b) -> IO ()
masterReloader   :: (Snaplet b -> Snaplet b) -> IO ()
        -- ^ We can't just hae a simple MVar here because MVars can't be
        -- chrooted.
    }


------------------------------------------------------------------------------
-- | Wrapper around IO actions that modify state elements created during
-- initialization.
newtype Hook a = Hook (Snaplet a -> IO (Either Text (Snaplet a)))

instance Semigroup (Hook a) where
    Hook Snaplet a -> IO (Either Text (Snaplet a))
a <> :: Hook a -> Hook a -> Hook a
<> Hook Snaplet a -> IO (Either Text (Snaplet a))
b = forall a. (Snaplet a -> IO (Either Text (Snaplet a))) -> Hook a
Hook forall a b. (a -> b) -> a -> b
$ \Snaplet a
s -> do
      Either Text (Snaplet a)
ea <- Snaplet a -> IO (Either Text (Snaplet a))
a Snaplet a
s
      case Either Text (Snaplet a)
ea of
        Left Text
e -> forall (m :: * -> *) a. Monad m => a -> m a
return forall a b. (a -> b) -> a -> b
$ forall a b. a -> Either a b
Left Text
e
        Right Snaplet a
ares -> do
          Either Text (Snaplet a)
eb <- Snaplet a -> IO (Either Text (Snaplet a))
b Snaplet a
ares
          case Either Text (Snaplet a)
eb of
            Left Text
e -> forall (m :: * -> *) a. Monad m => a -> m a
return forall a b. (a -> b) -> a -> b
$ forall a b. a -> Either a b
Left Text
e
            Right Snaplet a
bres -> forall (m :: * -> *) a. Monad m => a -> m a
return forall a b. (a -> b) -> a -> b
$ forall a b. b -> Either a b
Right Snaplet a
bres


------------------------------------------------------------------------------
instance Monoid (Hook a) where
    mempty :: Hook a
mempty = forall a. (Snaplet a -> IO (Either Text (Snaplet a))) -> Hook a
Hook (forall (m :: * -> *) a. Monad m => a -> m a
return forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall a b. b -> Either a b
Right)
#if !MIN_VERSION_base(4,11,0)
    mappend = (<>)
#endif


------------------------------------------------------------------------------
-- | Monad used for initializing snaplets.
newtype Initializer b v a =
    Initializer (LT.LensT (Snaplet b)
                          (Snaplet v)
                          (InitializerState b)
                          (WriterT (Hook b) IO)
                          a)
  deriving (forall a. a -> Initializer b v a
forall {b} {v}. Functor (Initializer b v)
forall a b.
Initializer b v a -> Initializer b v b -> Initializer b v a
forall a b.
Initializer b v a -> Initializer b v b -> Initializer b v b
forall a b.
Initializer b v (a -> b) -> Initializer b v a -> Initializer b v b
forall b v a. a -> Initializer b v a
forall a b c.
(a -> b -> c)
-> Initializer b v a -> Initializer b v b -> Initializer b v c
forall b v a b.
Initializer b v a -> Initializer b v b -> Initializer b v a
forall b v a b.
Initializer b v a -> Initializer b v b -> Initializer b v b
forall b v a b.
Initializer b v (a -> b) -> Initializer b v a -> Initializer b v b
forall b v a b c.
(a -> b -> c)
-> Initializer b v a -> Initializer b v b -> Initializer b v c
forall (f :: * -> *).
Functor f
-> (forall a. a -> f a)
-> (forall a b. f (a -> b) -> f a -> f b)
-> (forall a b c. (a -> b -> c) -> f a -> f b -> f c)
-> (forall a b. f a -> f b -> f b)
-> (forall a b. f a -> f b -> f a)
-> Applicative f
<* :: forall a b.
Initializer b v a -> Initializer b v b -> Initializer b v a
$c<* :: forall b v a b.
Initializer b v a -> Initializer b v b -> Initializer b v a
*> :: forall a b.
Initializer b v a -> Initializer b v b -> Initializer b v b
$c*> :: forall b v a b.
Initializer b v a -> Initializer b v b -> Initializer b v b
liftA2 :: forall a b c.
(a -> b -> c)
-> Initializer b v a -> Initializer b v b -> Initializer b v c
$cliftA2 :: forall b v a b c.
(a -> b -> c)
-> Initializer b v a -> Initializer b v b -> Initializer b v c
<*> :: forall a b.
Initializer b v (a -> b) -> Initializer b v a -> Initializer b v b
$c<*> :: forall b v a b.
Initializer b v (a -> b) -> Initializer b v a -> Initializer b v b
pure :: forall a. a -> Initializer b v a
$cpure :: forall b v a. a -> Initializer b v a
Applicative, forall a b. a -> Initializer b v b -> Initializer b v a
forall a b. (a -> b) -> Initializer b v a -> Initializer b v b
forall b v a b. a -> Initializer b v b -> Initializer b v a
forall b v a b. (a -> b) -> Initializer b v a -> Initializer b v b
forall (f :: * -> *).
(forall a b. (a -> b) -> f a -> f b)
-> (forall a b. a -> f b -> f a) -> Functor f
<$ :: forall a b. a -> Initializer b v b -> Initializer b v a
$c<$ :: forall b v a b. a -> Initializer b v b -> Initializer b v a
fmap :: forall a b. (a -> b) -> Initializer b v a -> Initializer b v b
$cfmap :: forall b v a b. (a -> b) -> Initializer b v a -> Initializer b v b
Functor, forall a. a -> Initializer b v a
forall b v. Applicative (Initializer b v)
forall a b.
Initializer b v a -> Initializer b v b -> Initializer b v b
forall a b.
Initializer b v a -> (a -> Initializer b v b) -> Initializer b v b
forall b v a. a -> Initializer b v a
forall b v a b.
Initializer b v a -> Initializer b v b -> Initializer b v b
forall b v a b.
Initializer b v a -> (a -> Initializer b v b) -> Initializer b v b
forall (m :: * -> *).
Applicative m
-> (forall a b. m a -> (a -> m b) -> m b)
-> (forall a b. m a -> m b -> m b)
-> (forall a. a -> m a)
-> Monad m
return :: forall a. a -> Initializer b v a
$creturn :: forall b v a. a -> Initializer b v a
>> :: forall a b.
Initializer b v a -> Initializer b v b -> Initializer b v b
$c>> :: forall b v a b.
Initializer b v a -> Initializer b v b -> Initializer b v b
>>= :: forall a b.
Initializer b v a -> (a -> Initializer b v b) -> Initializer b v b
$c>>= :: forall b v a b.
Initializer b v a -> (a -> Initializer b v b) -> Initializer b v b
Monad, forall a. IO a -> Initializer b v a
forall b v. Monad (Initializer b v)
forall b v a. IO a -> Initializer b v a
forall (m :: * -> *).
Monad m -> (forall a. IO a -> m a) -> MonadIO m
liftIO :: forall a. IO a -> Initializer b v a
$cliftIO :: forall b v a. IO a -> Initializer b v a
MonadIO)

makeLenses ''InitializerState


------------------------------------------------------------------------------
instance MonadSnaplet Initializer where
    getLens :: forall b v. Initializer b v (SnapletLens (Snaplet b) v)
getLens = forall b v a.
LensT
  (Snaplet b)
  (Snaplet v)
  (InitializerState b)
  (WriterT (Hook b) IO)
  a
-> Initializer b v a
Initializer forall r (m :: * -> *). MonadReader r m => m r
ask
    with' :: forall v v' b a.
SnapletLens (Snaplet v) v'
-> Initializer b v' a -> Initializer b v a
with' !SnapletLens (Snaplet v) v'
l (Initializer !LensT
  (Snaplet b)
  (Snaplet v')
  (InitializerState b)
  (WriterT (Hook b) IO)
  a
m) = forall b v a.
LensT
  (Snaplet b)
  (Snaplet v)
  (InitializerState b)
  (WriterT (Hook b) IO)
  a
-> Initializer b v a
Initializer forall a b. (a -> b) -> a -> b
$ forall (m :: * -> *) v v' b s a.
Monad m =>
ALens' v v' -> LensT b v' s m a -> LensT b v s m a
LT.with SnapletLens (Snaplet v) v'
l LensT
  (Snaplet b)
  (Snaplet v')
  (InitializerState b)
  (WriterT (Hook b) IO)
  a
m
    withTop' :: forall b v' a v.
SnapletLens (Snaplet b) v'
-> Initializer b v' a -> Initializer b v a
withTop' !SnapletLens (Snaplet b) v'
l (Initializer LensT
  (Snaplet b)
  (Snaplet v')
  (InitializerState b)
  (WriterT (Hook b) IO)
  a
m) = forall b v a.
LensT
  (Snaplet b)
  (Snaplet v)
  (InitializerState b)
  (WriterT (Hook b) IO)
  a
-> Initializer b v a
Initializer forall a b. (a -> b) -> a -> b
$ forall (m :: * -> *) b v' s a v.
Monad m =>
ALens' b v' -> LensT b v' s m a -> LensT b v s m a
LT.withTop SnapletLens (Snaplet b) v'
l LensT
  (Snaplet b)
  (Snaplet v')
  (InitializerState b)
  (WriterT (Hook b) IO)
  a
m
    getOpaqueConfig :: forall b v. Initializer b v SnapletConfig
getOpaqueConfig = forall b v a.
LensT
  (Snaplet b)
  (Snaplet v)
  (InitializerState b)
  (WriterT (Hook b) IO)
  a
-> Initializer b v a
Initializer forall a b. (a -> b) -> a -> b
$ forall (m :: * -> *) a1 r. Monad m => (a1 -> r) -> m a1 -> m r
liftM forall b. InitializerState b -> SnapletConfig
_curConfig forall (m :: * -> *) b v s. Monad m => LensT b v s m s
LT.getBase


------------------------------------------------------------------------------
-- | Opaque newtype which gives us compile-time guarantees that the user is
-- using makeSnaplet and either nestSnaplet or embedSnaplet correctly.
newtype SnapletInit b v = SnapletInit (Initializer b v (Snaplet v))