{-# LANGUAGE OverloadedStrings #-}

module Hasql.Private.TransactionIO where

-- base
import Control.Applicative

-- bytestring
import Data.ByteString (ByteString)

-- bytestring-tree-builder
import ByteString.TreeBuilder

-- transformers
import Control.Monad.Trans.Reader
import Control.Monad.Trans.Class

-- mtl
import Control.Monad.Error.Class

-- unliftio-core
import Control.Monad.IO.Unlift

-- resourcet
import Data.Acquire
import Control.Monad.Trans.Resource

-- hasql
import Hasql.Statement
import Hasql.Session
import qualified Hasql.Session as Session

-- hasql-streaming
import Hasql.Private.Session.UnliftIO
import Hasql.Private.Types
import qualified Hasql.Private.Statements as Statements

-- | A mixture of Hasql statements and arbitrary IO that is all performed during a single transaction
newtype TransactionIO a = TransactionIO (ReaderT Transaction Session a)
  deriving (forall a b. a -> TransactionIO b -> TransactionIO a
forall a b. (a -> b) -> TransactionIO a -> TransactionIO 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 -> TransactionIO b -> TransactionIO a
$c<$ :: forall a b. a -> TransactionIO b -> TransactionIO a
fmap :: forall a b. (a -> b) -> TransactionIO a -> TransactionIO b
$cfmap :: forall a b. (a -> b) -> TransactionIO a -> TransactionIO b
Functor, Functor TransactionIO
forall a. a -> TransactionIO a
forall a b. TransactionIO a -> TransactionIO b -> TransactionIO a
forall a b. TransactionIO a -> TransactionIO b -> TransactionIO b
forall a b.
TransactionIO (a -> b) -> TransactionIO a -> TransactionIO b
forall a b c.
(a -> b -> c)
-> TransactionIO a -> TransactionIO b -> TransactionIO 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. TransactionIO a -> TransactionIO b -> TransactionIO a
$c<* :: forall a b. TransactionIO a -> TransactionIO b -> TransactionIO a
*> :: forall a b. TransactionIO a -> TransactionIO b -> TransactionIO b
$c*> :: forall a b. TransactionIO a -> TransactionIO b -> TransactionIO b
liftA2 :: forall a b c.
(a -> b -> c)
-> TransactionIO a -> TransactionIO b -> TransactionIO c
$cliftA2 :: forall a b c.
(a -> b -> c)
-> TransactionIO a -> TransactionIO b -> TransactionIO c
<*> :: forall a b.
TransactionIO (a -> b) -> TransactionIO a -> TransactionIO b
$c<*> :: forall a b.
TransactionIO (a -> b) -> TransactionIO a -> TransactionIO b
pure :: forall a. a -> TransactionIO a
$cpure :: forall a. a -> TransactionIO a
Applicative, Applicative TransactionIO
forall a. a -> TransactionIO a
forall a b. TransactionIO a -> TransactionIO b -> TransactionIO b
forall a b.
TransactionIO a -> (a -> TransactionIO b) -> TransactionIO 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 -> TransactionIO a
$creturn :: forall a. a -> TransactionIO a
>> :: forall a b. TransactionIO a -> TransactionIO b -> TransactionIO b
$c>> :: forall a b. TransactionIO a -> TransactionIO b -> TransactionIO b
>>= :: forall a b.
TransactionIO a -> (a -> TransactionIO b) -> TransactionIO b
$c>>= :: forall a b.
TransactionIO a -> (a -> TransactionIO b) -> TransactionIO b
Monad, Monad TransactionIO
forall a. IO a -> TransactionIO a
forall (m :: * -> *).
Monad m -> (forall a. IO a -> m a) -> MonadIO m
liftIO :: forall a. IO a -> TransactionIO a
$cliftIO :: forall a. IO a -> TransactionIO a
MonadIO, MonadError QueryError, MonadIO TransactionIO
forall b.
((forall a. TransactionIO a -> IO a) -> IO b) -> TransactionIO b
forall (m :: * -> *).
MonadIO m
-> (forall b. ((forall a. m a -> IO a) -> IO b) -> m b)
-> MonadUnliftIO m
withRunInIO :: forall b.
((forall a. TransactionIO a -> IO a) -> IO b) -> TransactionIO b
$cwithRunInIO :: forall b.
((forall a. TransactionIO a -> IO a) -> IO b) -> TransactionIO b
MonadUnliftIO)

data Transaction = Transaction

instance Semigroup a => Semigroup (TransactionIO a) where
  <> :: TransactionIO a -> TransactionIO a -> TransactionIO a
(<>) = forall (f :: * -> *) a b c.
Applicative f =>
(a -> b -> c) -> f a -> f b -> f c
liftA2 forall a. Semigroup a => a -> a -> a
(<>)

instance Monoid a => Monoid (TransactionIO a) where
  mempty :: TransactionIO a
mempty = forall (f :: * -> *) a. Applicative f => a -> f a
pure forall a. Monoid a => a
mempty

run :: TransactionIO a -> IsolationLevel -> Mode -> Deferrable -> Bool -> Session a
run :: forall a.
TransactionIO a
-> IsolationLevel -> Mode -> Deferrable -> Bool -> Session a
run (TransactionIO ReaderT Transaction Session a
txio) IsolationLevel
isolation Mode
mode Deferrable
deferrable Bool
preparable = forall (m :: * -> *) a. MonadUnliftIO m => ResourceT m a -> m a
runResourceT forall a b. (a -> b) -> a -> b
$ do
  UnliftIO forall a. Session a -> IO a
runInIO <- forall (t :: (* -> *) -> * -> *) (m :: * -> *) a.
(MonadTrans t, Monad m) =>
m a -> t m a
lift forall (m :: * -> *). MonadUnliftIO m => m (UnliftIO m)
askUnliftIO
  let acq :: Acquire Transaction
acq = forall a. IO a -> (a -> ReleaseType -> IO ()) -> Acquire a
mkAcquireType (forall a. Session a -> IO a
runInIO forall a b. (a -> b) -> a -> b
$ IsolationLevel -> Mode -> Deferrable -> Bool -> Session Transaction
startTransaction IsolationLevel
isolation Mode
mode Deferrable
deferrable Bool
preparable) ((forall a. Session a -> IO a
runInIO forall b c a. (b -> c) -> (a -> b) -> a -> c
.) forall b c a. (b -> c) -> (a -> b) -> a -> c
. Bool -> Transaction -> ReleaseType -> Session ()
endTransaction Bool
preparable)
  (ReleaseKey
_, Transaction
tx) <- forall (m :: * -> *) a.
MonadResource m =>
Acquire a -> m (ReleaseKey, a)
allocateAcquire Acquire Transaction
acq
  forall (t :: (* -> *) -> * -> *) (m :: * -> *) a.
(MonadTrans t, Monad m) =>
m a -> t m a
lift forall a b. (a -> b) -> a -> b
$ forall r (m :: * -> *) a. ReaderT r m a -> r -> m a
runReaderT ReaderT Transaction Session a
txio Transaction
tx

-- | Like `Session.sql` but in a `TransactionIO`. It should not attempt any statements that cannot be safely run inside a transaction.
sql :: ByteString -> TransactionIO ()
sql :: ByteString -> TransactionIO ()
sql = forall a. ReaderT Transaction Session a -> TransactionIO a
TransactionIO forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall (t :: (* -> *) -> * -> *) (m :: * -> *) a.
(MonadTrans t, Monad m) =>
m a -> t m a
lift forall b c a. (b -> c) -> (a -> b) -> a -> c
. ByteString -> Session ()
Session.sql

-- | Like `Session.statement` but in a `TransactionIO`. It should not attempt any statements that cannot be safely run inside a transaction.
statement :: params -> Statement params result -> TransactionIO result
statement :: forall params result.
params -> Statement params result -> TransactionIO result
statement params
params Statement params result
stmt = forall a. ReaderT Transaction Session a -> TransactionIO a
TransactionIO forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall (t :: (* -> *) -> * -> *) (m :: * -> *) a.
(MonadTrans t, Monad m) =>
m a -> t m a
lift forall a b. (a -> b) -> a -> b
$ forall params result.
params -> Statement params result -> Session result
Session.statement params
params Statement params result
stmt

startTransaction :: IsolationLevel -> Mode -> Deferrable -> Bool -> Session Transaction
startTransaction :: IsolationLevel -> Mode -> Deferrable -> Bool -> Session Transaction
startTransaction IsolationLevel
isolation Mode
mode Deferrable
deferrable Bool
prepare = do
  forall params result.
params -> Statement params result -> Session result
Session.statement () (IsolationLevel -> Mode -> Deferrable -> Bool -> Statement () ()
Statements.startTransaction IsolationLevel
isolation Mode
mode Deferrable
deferrable Bool
prepare)
  forall (f :: * -> *) a. Applicative f => a -> f a
pure Transaction
Transaction

endTransaction :: Bool -> Transaction -> ReleaseType -> Session ()
endTransaction :: Bool -> Transaction -> ReleaseType -> Session ()
endTransaction Bool
prepare Transaction
tx = \case
  ReleaseType
ReleaseEarly -> Bool -> Transaction -> Session ()
commitTransaction Bool
prepare Transaction
tx
  ReleaseType
ReleaseNormal -> Bool -> Transaction -> Session ()
commitTransaction Bool
prepare Transaction
tx
  ReleaseType
ReleaseException -> Bool -> Transaction -> Session ()
rollbackTransaction Bool
prepare Transaction
tx

commitTransaction :: Bool -> Transaction -> Session ()
commitTransaction :: Bool -> Transaction -> Session ()
commitTransaction Bool
prepare Transaction
Transaction = do
  forall params result.
params -> Statement params result -> Session result
Session.statement () (Bool -> Statement () ()
Statements.commitTransaction Bool
prepare)

rollbackTransaction :: Bool -> Transaction -> Session ()
rollbackTransaction :: Bool -> Transaction -> Session ()
rollbackTransaction Bool
prepare Transaction
Transaction = do
  forall params result.
params -> Statement params result -> Session result
Session.statement () (Bool -> Statement () ()
Statements.rollbackTransaction Bool
prepare)