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Added ability to cancel running Async actions #321

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merged 2 commits into from
Jun 8, 2020
Merged

Added ability to cancel running Async actions #321

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bc9082d
Added ability to cancel running Async actions
aidangilmore Feb 16, 2020
91d39ee
Removed unsafe async helper function
aidangilmore May 1, 2020
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6 changes: 5 additions & 1 deletion src/Polysemy/Async.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,7 @@ module Polysemy.Async
-- * Actions
, async
, await
, cancel

-- * Helpers
, sequenceConcurrently
Expand All @@ -33,6 +34,7 @@ import Polysemy.Final
data Async m a where
Async :: m a -> Async m (A.Async (Maybe a))
Await :: A.Async a -> Async m a
Cancel :: A.Async a -> Async m ()

makeSem ''Async

Expand All @@ -46,7 +48,6 @@ sequenceConcurrently :: forall t r a. (Traversable t, Member Async r) =>
sequenceConcurrently t = traverse async t >>= traverse await
{-# INLINABLE sequenceConcurrently #-}


------------------------------------------------------------------------------
-- | A more flexible --- though less performant ---
-- version of 'asyncToIOFinal'.
Expand Down Expand Up @@ -80,6 +81,7 @@ asyncToIO m = withLowerToIO $ \lower _ -> lower $
pureT $ fmap (inspect ins) fa

Await a -> pureT =<< embed (A.wait a)
Cancel a -> pureT =<< embed (A.cancel a)
) m
{-# INLINE asyncToIO #-}

Expand Down Expand Up @@ -110,6 +112,7 @@ asyncToIOFinal = interpretFinal $ \case
m' <- runS m
liftS $ A.async (inspect ins <$> m')
Await a -> liftS (A.wait a)
Cancel a -> liftS (A.cancel a)
{-# INLINE asyncToIOFinal #-}

------------------------------------------------------------------------------
Expand All @@ -132,6 +135,7 @@ lowerAsync lower m = interpretH
pureT $ fmap (inspect ins) fa

Await a -> pureT =<< embed (A.wait a)
Cancel a -> pureT =<< embed (A.cancel a)
) m
{-# INLINE lowerAsync #-}
{-# DEPRECATED lowerAsync "Use 'asyncToIOFinal' instead" #-}