{-# LANGUAGE ConstraintKinds #-}
{-# LANGUAGE DuplicateRecordFields #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE KindSignatures #-}
{-# LANGUAGE MagicHash #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE StrictData #-}
{-# LANGUAGE TypeOperators #-}
{-# LANGUAGE UnboxedTuples #-}
{-# LANGUAGE UnliftedFFITypes #-}

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

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

{- |
 Module      :  OpenTelemetry.Util
 Copyright   :  (c) Ian Duncan, 2021
 License     :  BSD-3
 Description :  Convenience functions to simplify common instrumentation needs.
 Maintainer  :  Ian Duncan
 Stability   :  experimental
 Portability :  non-portable (GHC extensions)
-}
module OpenTelemetry.Util (
  constructorName,
  HasConstructor,
  getThreadId,
  bracketError,

  -- * Data structures
  AppendOnlyBoundedCollection,
  emptyAppendOnlyBoundedCollection,
  appendToBoundedCollection,
  appendOnlyBoundedCollectionSize,
  appendOnlyBoundedCollectionValues,
  appendOnlyBoundedCollectionDroppedElementCount,
) where

import Control.Exception (SomeException)
import qualified Control.Exception as EUnsafe
import Control.Monad.IO.Unlift
import Data.Kind
import qualified Data.Vector as V
import Foreign.C (CInt (..))
import GHC.Base (Addr#)
import GHC.Conc (ThreadId (ThreadId))
import GHC.Exts (unsafeCoerce#)
import GHC.Generics
import VectorBuilder.Builder (Builder)
import qualified VectorBuilder.Builder as Builder
import qualified VectorBuilder.Vector as Builder


{- | Useful for annotating which constructor in an ADT was chosen

 @since 0.1.0.0
-}
constructorName :: (HasConstructor (Rep a), Generic a) => a -> String
constructorName :: forall a. (HasConstructor (Rep a), Generic a) => a -> String
constructorName = Rep a Any -> String
forall x. Rep a x -> String
forall (f :: * -> *) x. HasConstructor f => f x -> String
genericConstrName (Rep a Any -> String) -> (a -> Rep a Any) -> a -> String
forall b c a. (b -> c) -> (a -> b) -> a -> c
. a -> Rep a Any
forall x. a -> Rep a x
forall a x. Generic a => a -> Rep a x
from


-- | Detect a constructor from any datatype which derives 'Generic'
class HasConstructor (f :: Type -> Type) where
  genericConstrName :: f x -> String


instance (HasConstructor f) => HasConstructor (D1 c f) where
  genericConstrName :: forall x. D1 c f x -> String
genericConstrName (M1 f x
x) = f x -> String
forall x. f x -> String
forall (f :: * -> *) x. HasConstructor f => f x -> String
genericConstrName f x
x


instance (HasConstructor x, HasConstructor y) => HasConstructor (x :+: y) where
  genericConstrName :: forall x. (:+:) x y x -> String
genericConstrName (L1 x x
l) = x x -> String
forall x. x x -> String
forall (f :: * -> *) x. HasConstructor f => f x -> String
genericConstrName x x
l
  genericConstrName (R1 y x
r) = y x -> String
forall x. y x -> String
forall (f :: * -> *) x. HasConstructor f => f x -> String
genericConstrName y x
r


instance (Constructor c) => HasConstructor (C1 c f) where
  genericConstrName :: forall x. C1 c f x -> String
genericConstrName = M1 C c f x -> String
forall {k} (c :: k) k1 (t :: k -> (k1 -> *) -> k1 -> *)
       (f :: k1 -> *) (a :: k1).
Constructor c =>
t c f a -> String
forall k1 (t :: Meta -> (k1 -> *) -> k1 -> *) (f :: k1 -> *)
       (a :: k1).
t c f a -> String
conName


foreign import ccall unsafe "rts_getThreadId" c_getThreadId :: Addr# -> CInt


-- | Get an int representation of a thread id
getThreadId :: ThreadId -> Int
getThreadId :: ThreadId -> Int
getThreadId (ThreadId ThreadId#
tid#) = CInt -> Int
forall a b. (Integral a, Num b) => a -> b
fromIntegral (CInt -> Int) -> CInt -> Int
forall a b. (a -> b) -> a -> b
$ Addr# -> CInt
c_getThreadId (ThreadId# -> Addr#
forall a b. a -> b
unsafeCoerce# ThreadId#
tid#)
{-# INLINE getThreadId #-}


data AppendOnlyBoundedCollection a = AppendOnlyBoundedCollection
  { forall a. AppendOnlyBoundedCollection a -> Builder a
collection :: Builder a
  , forall a. AppendOnlyBoundedCollection a -> Int
maxSize :: {-# UNPACK #-} !Int
  , forall a. AppendOnlyBoundedCollection a -> Int
dropped :: {-# UNPACK #-} !Int
  }


instance forall a. (Show a) => Show (AppendOnlyBoundedCollection a) where
  showsPrec :: Int -> AppendOnlyBoundedCollection a -> ShowS
showsPrec Int
d AppendOnlyBoundedCollection {$sel:collection:AppendOnlyBoundedCollection :: forall a. AppendOnlyBoundedCollection a -> Builder a
collection = Builder a
c, $sel:maxSize:AppendOnlyBoundedCollection :: forall a. AppendOnlyBoundedCollection a -> Int
maxSize = Int
m, $sel:dropped:AppendOnlyBoundedCollection :: forall a. AppendOnlyBoundedCollection a -> Int
dropped = Int
r} =
    let vec :: Vector a
vec = Builder a -> Vector a
forall (vector :: * -> *) element.
Vector vector element =>
Builder element -> vector element
Builder.build Builder a
c :: V.Vector a
    in Bool -> ShowS -> ShowS
showParen (Int
d Int -> Int -> Bool
forall a. Ord a => a -> a -> Bool
> Int
10) (ShowS -> ShowS) -> ShowS -> ShowS
forall a b. (a -> b) -> a -> b
$
        String -> ShowS
showString String
"AppendOnlyBoundedCollection {collection = "
          ShowS -> ShowS -> ShowS
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Vector a -> ShowS
forall a. Show a => a -> ShowS
shows Vector a
vec
          ShowS -> ShowS -> ShowS
forall b c a. (b -> c) -> (a -> b) -> a -> c
. String -> ShowS
showString String
", maxSize = "
          ShowS -> ShowS -> ShowS
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Int -> ShowS
forall a. Show a => a -> ShowS
shows Int
m
          ShowS -> ShowS -> ShowS
forall b c a. (b -> c) -> (a -> b) -> a -> c
. String -> ShowS
showString String
", dropped = "
          ShowS -> ShowS -> ShowS
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Int -> ShowS
forall a. Show a => a -> ShowS
shows Int
r
          ShowS -> ShowS -> ShowS
forall b c a. (b -> c) -> (a -> b) -> a -> c
. String -> ShowS
showString String
"}"


-- | Initialize a bounded collection that admits a maximum size
emptyAppendOnlyBoundedCollection
  :: Int
  -- ^ Maximum size
  -> AppendOnlyBoundedCollection a
emptyAppendOnlyBoundedCollection :: forall a. Int -> AppendOnlyBoundedCollection a
emptyAppendOnlyBoundedCollection Int
s = Builder a -> Int -> Int -> AppendOnlyBoundedCollection a
forall a. Builder a -> Int -> Int -> AppendOnlyBoundedCollection a
AppendOnlyBoundedCollection Builder a
forall a. Monoid a => a
mempty Int
s Int
0


appendOnlyBoundedCollectionValues :: AppendOnlyBoundedCollection a -> V.Vector a
appendOnlyBoundedCollectionValues :: forall a. AppendOnlyBoundedCollection a -> Vector a
appendOnlyBoundedCollectionValues (AppendOnlyBoundedCollection Builder a
a Int
_ Int
_) = Builder a -> Vector a
forall (vector :: * -> *) element.
Vector vector element =>
Builder element -> vector element
Builder.build Builder a
a


appendOnlyBoundedCollectionSize :: AppendOnlyBoundedCollection a -> Int
appendOnlyBoundedCollectionSize :: forall a. AppendOnlyBoundedCollection a -> Int
appendOnlyBoundedCollectionSize (AppendOnlyBoundedCollection Builder a
b Int
_ Int
_) = Builder a -> Int
forall element. Builder element -> Int
Builder.size Builder a
b


appendOnlyBoundedCollectionDroppedElementCount :: AppendOnlyBoundedCollection a -> Int
appendOnlyBoundedCollectionDroppedElementCount :: forall a. AppendOnlyBoundedCollection a -> Int
appendOnlyBoundedCollectionDroppedElementCount (AppendOnlyBoundedCollection Builder a
_ Int
_ Int
d) = Int
d


appendToBoundedCollection :: AppendOnlyBoundedCollection a -> a -> AppendOnlyBoundedCollection a
appendToBoundedCollection :: forall a.
AppendOnlyBoundedCollection a -> a -> AppendOnlyBoundedCollection a
appendToBoundedCollection c :: AppendOnlyBoundedCollection a
c@(AppendOnlyBoundedCollection Builder a
b Int
ms Int
d) a
x =
  if AppendOnlyBoundedCollection a -> Int
forall a. AppendOnlyBoundedCollection a -> Int
appendOnlyBoundedCollectionSize AppendOnlyBoundedCollection a
c Int -> Int -> Bool
forall a. Ord a => a -> a -> Bool
< Int
ms
    then Builder a -> Int -> Int -> AppendOnlyBoundedCollection a
forall a. Builder a -> Int -> Int -> AppendOnlyBoundedCollection a
AppendOnlyBoundedCollection (Builder a
b Builder a -> Builder a -> Builder a
forall a. Semigroup a => a -> a -> a
<> a -> Builder a
forall element. element -> Builder element
Builder.singleton a
x) Int
ms Int
d
    else Builder a -> Int -> Int -> AppendOnlyBoundedCollection a
forall a. Builder a -> Int -> Int -> AppendOnlyBoundedCollection a
AppendOnlyBoundedCollection Builder a
b Int
ms (Int
d Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
1)


{- | Like 'Context.Exception.bracket', but provides the @after@ function with information about
 uncaught exceptions.

 @since 0.1.0.0
-}
bracketError :: (MonadUnliftIO m) => m a -> (Maybe SomeException -> a -> m b) -> (a -> m c) -> m c
bracketError :: forall (m :: * -> *) a b c.
MonadUnliftIO m =>
m a -> (Maybe SomeException -> a -> m b) -> (a -> m c) -> m c
bracketError m a
before Maybe SomeException -> a -> m b
after a -> m c
thing = ((forall a. m a -> IO a) -> IO c) -> m c
forall b. ((forall a. m a -> IO a) -> IO b) -> m b
forall (m :: * -> *) b.
MonadUnliftIO m =>
((forall a. m a -> IO a) -> IO b) -> m b
withRunInIO (((forall a. m a -> IO a) -> IO c) -> m c)
-> ((forall a. m a -> IO a) -> IO c) -> m c
forall a b. (a -> b) -> a -> b
$ \forall a. m a -> IO a
run -> ((forall a. IO a -> IO a) -> IO c) -> IO c
forall b. ((forall a. IO a -> IO a) -> IO b) -> IO b
EUnsafe.mask (((forall a. IO a -> IO a) -> IO c) -> IO c)
-> ((forall a. IO a -> IO a) -> IO c) -> IO c
forall a b. (a -> b) -> a -> b
$ \forall a. IO a -> IO a
restore -> do
  a
x <- m a -> IO a
forall a. m a -> IO a
run m a
before
  Either SomeException c
res1 <- IO c -> IO (Either SomeException c)
forall e a. Exception e => IO a -> IO (Either e a)
EUnsafe.try (IO c -> IO (Either SomeException c))
-> IO c -> IO (Either SomeException c)
forall a b. (a -> b) -> a -> b
$ IO c -> IO c
forall a. IO a -> IO a
restore (IO c -> IO c) -> IO c -> IO c
forall a b. (a -> b) -> a -> b
$ m c -> IO c
forall a. m a -> IO a
run (m c -> IO c) -> m c -> IO c
forall a b. (a -> b) -> a -> b
$ a -> m c
thing a
x
  case Either SomeException c
res1 of
    Left (SomeException
e1 :: SomeException) -> do
      -- explicitly ignore exceptions from after. We know that
      -- no async exceptions were thrown there, so therefore
      -- the stronger exception must come from thing
      --
      -- https://github.com/fpco/safe-exceptions/issues/2
      Either SomeException b
_ :: Either SomeException b <-
        IO b -> IO (Either SomeException b)
forall e a. Exception e => IO a -> IO (Either e a)
EUnsafe.try (IO b -> IO (Either SomeException b))
-> IO b -> IO (Either SomeException b)
forall a b. (a -> b) -> a -> b
$ IO b -> IO b
forall a. IO a -> IO a
EUnsafe.uninterruptibleMask_ (IO b -> IO b) -> IO b -> IO b
forall a b. (a -> b) -> a -> b
$ m b -> IO b
forall a. m a -> IO a
run (m b -> IO b) -> m b -> IO b
forall a b. (a -> b) -> a -> b
$ Maybe SomeException -> a -> m b
after (SomeException -> Maybe SomeException
forall a. a -> Maybe a
Just SomeException
e1) a
x
      SomeException -> IO c
forall e a. Exception e => e -> IO a
EUnsafe.throwIO SomeException
e1
    Right c
y -> do
      b
_ <- IO b -> IO b
forall a. IO a -> IO a
EUnsafe.uninterruptibleMask_ (IO b -> IO b) -> IO b -> IO b
forall a b. (a -> b) -> a -> b
$ m b -> IO b
forall a. m a -> IO a
run (m b -> IO b) -> m b -> IO b
forall a b. (a -> b) -> a -> b
$ Maybe SomeException -> a -> m b
after Maybe SomeException
forall a. Maybe a
Nothing a
x
      c -> IO c
forall a. a -> IO a
forall (m :: * -> *) a. Monad m => a -> m a
return c
y