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Merge pull request #9 from alphaHeavy/monad-control

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Updating to monad-control-0.3, with help from Bas van Dijk.
This commit is contained in:
Tony Hannan 2011-12-06 15:17:06 -08:00
commit 6faad5d866
4 changed files with 51 additions and 30 deletions
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19
Control/Monad/MVar.hs
View file

@ -1,19 +1,18 @@
{- | Lift MVar operations so you can do them within monads stacked on top of IO. Analogous to MonadIO -}
{-# LANGUAGE TupleSections #-}
{-# LANGUAGE FlexibleContexts, TupleSections #-}
module Control.Monad.MVar (
MVar,
module Control.Monad.MVar,
liftIO,
MonadControlIO
) where
import Control.Concurrent.MVar (MVar)
import qualified Control.Concurrent.MVar as IO
import Control.Monad.Error (MonadIO (liftIO))
import Control.Monad.IO.Control (MonadControlIO, controlIO)
import Control.Exception.Control (mask, onException)
import Control.Monad.Trans.Control (MonadBaseControl, liftBaseWith)
import Control.Exception.Lifted (mask, onException)
newEmptyMVar :: (MonadIO m) => m (MVar a)
newEmptyMVar = liftIO IO.newEmptyMVar
@ -42,7 +41,7 @@ tryPutMVar var = liftIO . IO.tryPutMVar var
isEmptyMVar :: (MonadIO m) => MVar a -> m Bool
isEmptyMVar = liftIO . IO.isEmptyMVar
modifyMVar :: MonadControlIO m => MVar a -> (a -> m (a, b)) -> m b
modifyMVar :: (MonadIO m, MonadBaseControl IO m) => MVar a -> (a -> m (a, b)) -> m b
modifyMVar m io =
mask $ \restore -> do
a <- takeMVar m
@ -50,16 +49,16 @@ modifyMVar m io =
putMVar m a'
return b
addMVarFinalizer :: MonadControlIO m => MVar a -> m () -> m ()
addMVarFinalizer mvar f = controlIO $ \run ->
return $ liftIO $ IO.addMVarFinalizer mvar (run f >> return ())
addMVarFinalizer :: (MonadIO m, MonadBaseControl IO m) => MVar a -> m () -> m ()
addMVarFinalizer mv f = liftBaseWith $ \run ->
IO.addMVarFinalizer mv (run f >> return ())
modifyMVar_ :: (MonadControlIO m) => MVar a -> (a -> m a) -> m ()
modifyMVar_ :: (MonadIO m, MonadBaseControl IO m) => MVar a -> (a -> m a) -> m ()
modifyMVar_ var act = modifyMVar var $ \a -> do
a' <- act a
return (a', ())
withMVar :: (MonadControlIO m) => MVar a -> (a -> m b) -> m b
withMVar :: (MonadIO m, MonadBaseControl IO m) => MVar a -> (a -> m b) -> m b
withMVar var act = modifyMVar var $ \a -> do
b <- act a
return (a, b)

10
Database/MongoDB/Admin.hs
View file

@ -1,6 +1,6 @@
-- | Database administrative functions
{-# LANGUAGE OverloadedStrings, RecordWildCards #-}
{-# LANGUAGE FlexibleContexts, OverloadedStrings, RecordWildCards #-}
module Database.MongoDB.Admin (
-- * Admin
@ -39,7 +39,7 @@ import qualified Data.Set as S
import System.IO.Unsafe (unsafePerformIO)
import Control.Concurrent (forkIO, threadDelay)
import Database.MongoDB.Internal.Util (MonadIO', (<.>), true1)
import Control.Monad.MVar (MonadControlIO)
import Control.Monad.Trans.Control (MonadBaseControl)
-- * Admin
@ -122,7 +122,7 @@ dropIndex coll idxName = do
resetIndexCache
runCommand ["deleteIndexes" =: coll, "index" =: idxName]
getIndexes :: (MonadControlIO m, Functor m) => Collection -> Action m [Document]
getIndexes :: (MonadIO m, MonadBaseControl IO m, Functor m) => Collection -> Action m [Document]
-- ^ Get all indexes on this collection
getIndexes coll = do
db <- thisDatabase
@ -175,7 +175,7 @@ resetIndexCache = do
-- ** User
allUsers :: (MonadControlIO m, Functor m) => Action m [Document]
allUsers :: (MonadIO m, MonadBaseControl IO m, Functor m) => Action m [Document]
-- ^ Fetch all users of this database
allUsers = map (exclude ["_id"]) <$> (rest =<< find
(select [] "system.users") {sort = ["user" =: (1 :: Int)], project = ["user" =: (1 :: Int), "readOnly" =: (1 :: Int)]})
@ -242,7 +242,7 @@ storageSize c = at "storageSize" <$> collectionStats c
totalIndexSize :: (MonadIO' m) => Collection -> Action m Int
totalIndexSize c = at "totalIndexSize" <$> collectionStats c
totalSize :: (MonadControlIO m, MonadIO' m) => Collection -> Action m Int
totalSize :: (MonadIO m, MonadBaseControl IO m, MonadIO' m) => Collection -> Action m Int
totalSize coll = do
x <- storageSize coll
xs <- mapM isize =<< getIndexes coll

48
Database/MongoDB/Query.hs
View file

@ -50,6 +50,8 @@ import Control.Monad.Reader
import Control.Monad.State (StateT)
import Control.Monad.Writer (WriterT, Monoid)
import Control.Monad.RWS (RWST)
import Control.Monad.Base (MonadBase(liftBase))
import Control.Monad.Trans.Control (ComposeSt, MonadBaseControl(..), MonadTransControl(..), StM, StT, defaultLiftBaseWith, defaultRestoreM)
import Control.Applicative (Applicative, (<$>))
import Data.Maybe (listToMaybe, catMaybes)
import Data.Int (Int32)
@ -57,11 +59,29 @@ import Data.Word (Word32)
-- * Monad
newtype Action m a = Action (ErrorT Failure (ReaderT Context m) a)
deriving (Functor, Applicative, Monad, MonadIO, MonadControlIO, MonadError Failure)
newtype Action m a = Action {unAction :: ErrorT Failure (ReaderT Context m) a}
deriving (Functor, Applicative, Monad, MonadIO, MonadError Failure)
-- ^ A monad on top of m (which must be a MonadIO) that may access the database and may fail with a DB 'Failure'
instance MonadTrans Action where lift = Action . lift . lift
instance MonadBase b m => MonadBase b (Action m) where
liftBase = Action . liftBase
instance (MonadIO m, MonadBaseControl b m) => MonadBaseControl b (Action m) where
newtype StM (Action m) a = StMT {unStMT :: ComposeSt Action m a}
liftBaseWith = defaultLiftBaseWith StMT
restoreM = defaultRestoreM unStMT
instance MonadTrans Action where
lift = Action . lift . lift
instance MonadTransControl Action where
newtype StT Action a = StActionT {unStAction :: StT (ReaderT Context) (StT (ErrorT Failure) a)}
liftWith f = Action $ liftWith $ \runError ->
liftWith $ \runReader ->
f (liftM StActionT . runReader . runError . unAction)
restoreT = Action . restoreT . restoreT . liftM unStAction
access :: (MonadIO m) => Pipe -> AccessMode -> Database -> Action m a -> m (Either Failure a)
-- ^ Run action against database on server at other end of pipe. Use access mode for any reads and writes. Return Left on connection failure or read/write failure.
@ -139,11 +159,11 @@ call ns r = Action $ do
return (liftIOE ConnectionFailure promise)
-- | If you stack a monad on top of 'Action' then make it an instance of this class and use 'liftDB' to execute a DB Action within it. Instances already exist for the basic mtl transformers.
class (Monad m, MonadControlIO (BaseMonad m), Applicative (BaseMonad m), Functor (BaseMonad m)) => MonadDB m where
class (Monad m, MonadBaseControl IO (BaseMonad m), Applicative (BaseMonad m), Functor (BaseMonad m)) => MonadDB m where
type BaseMonad m :: * -> *
liftDB :: Action (BaseMonad m) a -> m a
instance (MonadControlIO m, Applicative m, Functor m) => MonadDB (Action m) where
instance (MonadBaseControl IO m, Applicative m, Functor m) => MonadDB (Action m) where
type BaseMonad (Action m) = m
liftDB = id
@ -192,7 +212,7 @@ auth usr pss = do
type Collection = UString
-- ^ Collection name (not prefixed with database)
allCollections :: (MonadControlIO m, Functor m) => Action m [Collection]
allCollections :: (MonadIO m, MonadBaseControl IO m, Functor m) => Action m [Collection]
-- ^ List all collections in this database
allCollections = do
db <- thisDatabase
@ -369,7 +389,7 @@ query :: Selector -> Collection -> Query
-- ^ Selects documents in collection that match selector. It uses no query options, projects all fields, does not skip any documents, does not limit result size, uses default batch size, does not sort, does not hint, and does not snapshot.
query sel col = Query [] (Select sel col) [] 0 0 [] False 0 []
find :: (MonadControlIO m) => Query -> Action m Cursor
find :: (MonadIO m, MonadBaseControl IO m) => Query -> Action m Cursor
-- ^ Fetch documents satisfying query
find q@Query{selection, batchSize} = do
db <- thisDatabase
@ -464,7 +484,7 @@ fulfill = Action . liftIOE id
data Cursor = Cursor FullCollection BatchSize (MVar DelayedBatch)
-- ^ Iterator over results of a query. Use 'next' to iterate or 'rest' to get all results. A cursor is closed when it is explicitly closed, all results have been read from it, garbage collected, or not used for over 10 minutes (unless 'NoCursorTimeout' option was specified in 'Query'). Reading from a closed cursor raises a 'CursorNotFoundFailure'. Note, a cursor is not closed when the pipe is closed, so you can open another pipe to the same server and continue using the cursor.
newCursor :: (MonadControlIO m) => Database -> Collection -> BatchSize -> DelayedBatch -> Action m Cursor
newCursor :: (MonadIO m, MonadBaseControl IO m) => Database -> Collection -> BatchSize -> DelayedBatch -> Action m Cursor
-- ^ Create new cursor. If you don't read all results then close it. Cursor will be closed automatically when all results are read from it or when eventually garbage collected.
newCursor db col batchSize dBatch = do
var <- newMVar dBatch
@ -472,7 +492,7 @@ newCursor db col batchSize dBatch = do
addMVarFinalizer var (closeCursor cursor)
return cursor
nextBatch :: (MonadControlIO m) => Cursor -> Action m [Document]
nextBatch :: (MonadIO m, MonadBaseControl IO m) => Cursor -> Action m [Document]
-- ^ Return next batch of documents in query result, which will be empty if finished.
nextBatch (Cursor fcol batchSize var) = modifyMVar var $ \dBatch -> do
-- Pre-fetch next batch promise from server and return current batch.
@ -483,7 +503,7 @@ nextBatch (Cursor fcol batchSize var) = modifyMVar var $ \dBatch -> do
nextBatch' limit cid = request [] (GetMore fcol batchSize' cid, remLimit)
where (batchSize', remLimit) = batchSizeRemainingLimit batchSize limit
next :: (MonadControlIO m) => Cursor -> Action m (Maybe Document)
next :: (MonadIO m, MonadBaseControl IO m) => Cursor -> Action m (Maybe Document)
-- ^ Return next document in query result, or Nothing if finished.
next (Cursor fcol batchSize var) = modifyMVar var nextState where
-- Pre-fetch next batch promise from server when last one in current batch is returned.
@ -502,15 +522,15 @@ next (Cursor fcol batchSize var) = modifyMVar var nextState where
nextBatch' limit cid = request [] (GetMore fcol batchSize' cid, remLimit)
where (batchSize', remLimit) = batchSizeRemainingLimit batchSize limit
nextN :: (MonadControlIO m, Functor m) => Int -> Cursor -> Action m [Document]
nextN :: (MonadIO m, MonadBaseControl IO m, Functor m) => Int -> Cursor -> Action m [Document]
-- ^ Return next N documents or less if end is reached
nextN n c = catMaybes <$> replicateM n (next c)
rest :: (MonadControlIO m, Functor m) => Cursor -> Action m [Document]
rest :: (MonadIO m, MonadBaseControl IO m, Functor m) => Cursor -> Action m [Document]
-- ^ Return remaining documents in query result
rest c = loop (next c)
closeCursor :: (MonadControlIO m) => Cursor -> Action m ()
closeCursor :: (MonadIO m, MonadBaseControl IO m) => Cursor -> Action m ()
closeCursor (Cursor _ _ var) = modifyMVar var $ \dBatch -> do
Batch _ cid _ <- fulfill dBatch
unless (cid == 0) $ send [KillCursors [cid]]
@ -618,7 +638,7 @@ mapReduce :: Collection -> MapFun -> ReduceFun -> MapReduce
-- ^ MapReduce on collection with given map and reduce functions. Remaining attributes are set to their defaults, which are stated in their comments.
mapReduce col map' red = MapReduce col map' red [] [] 0 Inline Nothing [] False
runMR :: (MonadControlIO m, Applicative m) => MapReduce -> Action m Cursor
runMR :: (MonadIO m, MonadBaseControl IO m, Applicative m) => MapReduce -> Action m Cursor
-- ^ Run MapReduce and return cursor of results. Error if map/reduce fails (because of bad Javascript)
runMR mr = do
res <- runMR' mr

4
mongoDB.cabal
View file

@ -18,7 +18,9 @@ build-depends:
parsec -any,
random -any,
random-shuffle -any,
monad-control >= 0.2 && < 0.3
monad-control >= 0.3.0.1 && < 0.4,
lifted-base >= 0.1.0.1 && < 0.2,
transformers-base >= 0.4 && < 0.5
stability: alpha
homepage: http://github.com/TonyGen/mongoDB-haskell
package-url: