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Merge branch 'pr-20'

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Conflicts:
	Database/MongoDB/Query.hs
This commit is contained in:
Fedor Gogolev 2014-04-12 17:06:52 +04:00
commit adb57dce72
9 changed files with 684 additions and 805 deletions
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66
Database/MongoDB/Admin.hs
View file

@ -30,7 +30,7 @@ module Database.MongoDB.Admin (
import Prelude hiding (lookup) import Prelude hiding (lookup)
import Control.Applicative ((<$>)) import Control.Applicative ((<$>))
import Control.Concurrent (forkIO, threadDelay) import Control.Concurrent (forkIO, threadDelay)
import Control.Monad (forever, unless) import Control.Monad (forever, unless, liftM)
import Data.IORef (IORef, newIORef, readIORef, writeIORef) import Data.IORef (IORef, newIORef, readIORef, writeIORef)
import Data.Set (Set) import Data.Set (Set)
import System.IO.Unsafe (unsafePerformIO) import System.IO.Unsafe (unsafePerformIO)
@ -47,7 +47,7 @@ import qualified Data.Text as T
import Database.MongoDB.Connection (Host, showHostPort) import Database.MongoDB.Connection (Host, showHostPort)
import Database.MongoDB.Internal.Protocol (pwHash, pwKey) import Database.MongoDB.Internal.Protocol (pwHash, pwKey)
import Database.MongoDB.Internal.Util (MonadIO', (<.>), true1) import Database.MongoDB.Internal.Util ((<.>), true1)
import Database.MongoDB.Query (Action, Database, Collection, Username, Password, import Database.MongoDB.Query (Action, Database, Collection, Username, Password,
Order, Query(..), accessMode, master, runCommand, Order, Query(..), accessMode, master, runCommand,
useDb, thisDatabase, rest, select, find, findOne, useDb, thisDatabase, rest, select, find, findOne,
@ -64,17 +64,17 @@ coptElem Capped = "capped" =: True
coptElem (MaxByteSize n) = "size" =: n coptElem (MaxByteSize n) = "size" =: n
coptElem (MaxItems n) = "max" =: n coptElem (MaxItems n) = "max" =: n
createCollection :: (MonadIO' m) => [CollectionOption] -> Collection -> Action m Document createCollection :: (MonadIO m) => [CollectionOption] -> Collection -> Action m Document
-- ^ Create collection with given options. You only need to call this to set options, otherwise a collection is created automatically on first use with no options. -- ^ Create collection with given options. You only need to call this to set options, otherwise a collection is created automatically on first use with no options.
createCollection opts col = runCommand $ ["create" =: col] ++ map coptElem opts createCollection opts col = runCommand $ ["create" =: col] ++ map coptElem opts
renameCollection :: (MonadIO' m) => Collection -> Collection -> Action m Document renameCollection :: (MonadIO m) => Collection -> Collection -> Action m Document
-- ^ Rename first collection to second collection -- ^ Rename first collection to second collection
renameCollection from to = do renameCollection from to = do
db <- thisDatabase db <- thisDatabase
useDb admin $ runCommand ["renameCollection" =: db <.> from, "to" =: db <.> to, "dropTarget" =: True] useDb admin $ runCommand ["renameCollection" =: db <.> from, "to" =: db <.> to, "dropTarget" =: True]
dropCollection :: (MonadIO' m) => Collection -> Action m Bool dropCollection :: (MonadIO m) => Collection -> Action m Bool
-- ^ Delete the given collection! Return True if collection existed (and was deleted); return False if collection did not exist (and no action). -- ^ Delete the given collection! Return True if collection existed (and was deleted); return False if collection did not exist (and no action).
dropCollection coll = do dropCollection coll = do
resetIndexCache resetIndexCache
@ -83,7 +83,7 @@ dropCollection coll = do
if at "errmsg" r == ("ns not found" :: Text) then return False else if at "errmsg" r == ("ns not found" :: Text) then return False else
fail $ "dropCollection failed: " ++ show r fail $ "dropCollection failed: " ++ show r
validateCollection :: (MonadIO' m) => Collection -> Action m Document validateCollection :: (MonadIO m) => Collection -> Action m Document
-- ^ This operation takes a while -- ^ This operation takes a while
validateCollection coll = runCommand ["validate" =: coll] validateCollection coll = runCommand ["validate" =: coll]
@ -115,7 +115,7 @@ genName :: Order -> IndexName
genName keys = T.intercalate "_" (map f keys) where genName keys = T.intercalate "_" (map f keys) where
f (k := v) = k `T.append` "_" `T.append` T.pack (show v) f (k := v) = k `T.append` "_" `T.append` T.pack (show v)
ensureIndex :: (MonadIO' m) => Index -> Action m () ensureIndex :: (MonadIO m) => Index -> Action m ()
-- ^ Create index if we did not already create one. May be called repeatedly with practically no performance hit, because we remember if we already called this for the same index (although this memory gets wiped out every 15 minutes, in case another client drops the index and we want to create it again). -- ^ Create index if we did not already create one. May be called repeatedly with practically no performance hit, because we remember if we already called this for the same index (although this memory gets wiped out every 15 minutes, in case another client drops the index and we want to create it again).
ensureIndex idx = let k = (iColl idx, iName idx) in do ensureIndex idx = let k = (iColl idx, iName idx) in do
icache <- fetchIndexCache icache <- fetchIndexCache
@ -124,11 +124,11 @@ ensureIndex idx = let k = (iColl idx, iName idx) in do
accessMode master (createIndex idx) accessMode master (createIndex idx)
liftIO $ writeIORef icache (Set.insert k set) liftIO $ writeIORef icache (Set.insert k set)
createIndex :: (MonadIO' m) => Index -> Action m () createIndex :: (MonadIO m) => Index -> Action m ()
-- ^ Create index on the server. This call goes to the server every time. -- ^ Create index on the server. This call goes to the server every time.
createIndex idx = insert_ "system.indexes" . idxDocument idx =<< thisDatabase createIndex idx = insert_ "system.indexes" . idxDocument idx =<< thisDatabase
dropIndex :: (MonadIO' m) => Collection -> IndexName -> Action m Document dropIndex :: (MonadIO m) => Collection -> IndexName -> Action m Document
-- ^ Remove the index -- ^ Remove the index
dropIndex coll idxName = do dropIndex coll idxName = do
resetIndexCache resetIndexCache
@ -140,7 +140,7 @@ getIndexes coll = do
db <- thisDatabase db <- thisDatabase
rest =<< find (select ["ns" =: db <.> coll] "system.indexes") rest =<< find (select ["ns" =: db <.> coll] "system.indexes")
dropIndexes :: (MonadIO' m) => Collection -> Action m Document dropIndexes :: (MonadIO m) => Collection -> Action m Document
-- ^ Drop all indexes on this collection -- ^ Drop all indexes on this collection
dropIndexes coll = do dropIndexes coll = do
resetIndexCache resetIndexCache
@ -192,7 +192,7 @@ allUsers :: (MonadIO m, MonadBaseControl IO m, Functor m) => Action m [Document]
allUsers = map (exclude ["_id"]) <$> (rest =<< find allUsers = map (exclude ["_id"]) <$> (rest =<< find
(select [] "system.users") {sort = ["user" =: (1 :: Int)], project = ["user" =: (1 :: Int), "readOnly" =: (1 :: Int)]}) (select [] "system.users") {sort = ["user" =: (1 :: Int)], project = ["user" =: (1 :: Int), "readOnly" =: (1 :: Int)]})
addUser :: (MonadIO' m) => Bool -> Username -> Password -> Action m () addUser :: (MonadIO m) => Bool -> Username -> Password -> Action m ()
-- ^ Add user with password with read-only access if bool is True or read-write access if bool is False -- ^ Add user with password with read-only access if bool is True or read-write access if bool is False
addUser readOnly user pass = do addUser readOnly user pass = do
mu <- findOne (select ["user" =: user] "system.users") mu <- findOne (select ["user" =: user] "system.users")
@ -208,76 +208,76 @@ admin :: Database
-- ^ \"admin\" database -- ^ \"admin\" database
admin = "admin" admin = "admin"
cloneDatabase :: (MonadIO' m) => Database -> Host -> Action m Document cloneDatabase :: (MonadIO m) => Database -> Host -> Action m Document
-- ^ Copy database from given host to the server I am connected to. Fails and returns @"ok" = 0@ if we don't have permission to read from given server (use copyDatabase in this case). -- ^ Copy database from given host to the server I am connected to. Fails and returns @"ok" = 0@ if we don't have permission to read from given server (use copyDatabase in this case).
cloneDatabase db fromHost = useDb db $ runCommand ["clone" =: showHostPort fromHost] cloneDatabase db fromHost = useDb db $ runCommand ["clone" =: showHostPort fromHost]
copyDatabase :: (MonadIO' m) => Database -> Host -> Maybe (Username, Password) -> Database -> Action m Document copyDatabase :: (MonadIO m) => Database -> Host -> Maybe (Username, Password) -> Database -> Action m Document
-- ^ Copy database from given host to the server I am connected to. If username & password is supplied use them to read from given host. -- ^ Copy database from given host to the server I am connected to. If username & password is supplied use them to read from given host.
copyDatabase fromDb fromHost mup toDb = do copyDatabase fromDb fromHost mup toDb = do
let c = ["copydb" =: (1 :: Int), "fromhost" =: showHostPort fromHost, "fromdb" =: fromDb, "todb" =: toDb] let c = ["copydb" =: (1 :: Int), "fromhost" =: showHostPort fromHost, "fromdb" =: fromDb, "todb" =: toDb]
useDb admin $ case mup of useDb admin $ case mup of
Nothing -> runCommand c Nothing -> runCommand c
Just (usr, pss) -> do Just (usr, pss) -> do
n <- at "nonce" <$> runCommand ["copydbgetnonce" =: (1 :: Int), "fromhost" =: showHostPort fromHost] n <- at "nonce" `liftM` runCommand ["copydbgetnonce" =: (1 :: Int), "fromhost" =: showHostPort fromHost]
runCommand $ c ++ ["username" =: usr, "nonce" =: n, "key" =: pwKey n usr pss] runCommand $ c ++ ["username" =: usr, "nonce" =: n, "key" =: pwKey n usr pss]
dropDatabase :: (MonadIO' m) => Database -> Action m Document dropDatabase :: (MonadIO m) => Database -> Action m Document
-- ^ Delete the given database! -- ^ Delete the given database!
dropDatabase db = useDb db $ runCommand ["dropDatabase" =: (1 :: Int)] dropDatabase db = useDb db $ runCommand ["dropDatabase" =: (1 :: Int)]
repairDatabase :: (MonadIO' m) => Database -> Action m Document repairDatabase :: (MonadIO m) => Database -> Action m Document
-- ^ Attempt to fix any corrupt records. This operation takes a while. -- ^ Attempt to fix any corrupt records. This operation takes a while.
repairDatabase db = useDb db $ runCommand ["repairDatabase" =: (1 :: Int)] repairDatabase db = useDb db $ runCommand ["repairDatabase" =: (1 :: Int)]
-- ** Server -- ** Server
serverBuildInfo :: (MonadIO' m) => Action m Document serverBuildInfo :: (MonadIO m) => Action m Document
serverBuildInfo = useDb admin $ runCommand ["buildinfo" =: (1 :: Int)] serverBuildInfo = useDb admin $ runCommand ["buildinfo" =: (1 :: Int)]
serverVersion :: (MonadIO' m) => Action m Text serverVersion :: (MonadIO m) => Action m Text
serverVersion = at "version" <$> serverBuildInfo serverVersion = at "version" `liftM` serverBuildInfo
-- * Diagnostics -- * Diagnostics
-- ** Collection -- ** Collection
collectionStats :: (MonadIO' m) => Collection -> Action m Document collectionStats :: (MonadIO m) => Collection -> Action m Document
collectionStats coll = runCommand ["collstats" =: coll] collectionStats coll = runCommand ["collstats" =: coll]
dataSize :: (MonadIO' m) => Collection -> Action m Int dataSize :: (MonadIO m) => Collection -> Action m Int
dataSize c = at "size" <$> collectionStats c dataSize c = at "size" `liftM` collectionStats c
storageSize :: (MonadIO' m) => Collection -> Action m Int storageSize :: (MonadIO m) => Collection -> Action m Int
storageSize c = at "storageSize" <$> collectionStats c storageSize c = at "storageSize" `liftM` collectionStats c
totalIndexSize :: (MonadIO' m) => Collection -> Action m Int totalIndexSize :: (MonadIO m) => Collection -> Action m Int
totalIndexSize c = at "totalIndexSize" <$> collectionStats c totalIndexSize c = at "totalIndexSize" `liftM` collectionStats c
totalSize :: (MonadIO m, MonadBaseControl IO m, MonadIO' m) => Collection -> Action m Int totalSize :: (MonadIO m, MonadBaseControl IO m) => Collection -> Action m Int
totalSize coll = do totalSize coll = do
x <- storageSize coll x <- storageSize coll
xs <- mapM isize =<< getIndexes coll xs <- mapM isize =<< getIndexes coll
return (foldl (+) x xs) return (foldl (+) x xs)
where where
isize idx = at "storageSize" <$> collectionStats (coll `T.append` ".$" `T.append` at "name" idx) isize idx = at "storageSize" `liftM` collectionStats (coll `T.append` ".$" `T.append` at "name" idx)
-- ** Profiling -- ** Profiling
data ProfilingLevel = Off | Slow | All deriving (Show, Enum, Eq) data ProfilingLevel = Off | Slow | All deriving (Show, Enum, Eq)
getProfilingLevel :: (MonadIO' m) => Action m ProfilingLevel getProfilingLevel :: (MonadIO m) => Action m ProfilingLevel
getProfilingLevel = toEnum . at "was" <$> runCommand ["profile" =: (-1 :: Int)] getProfilingLevel = (toEnum . at "was") `liftM` runCommand ["profile" =: (-1 :: Int)]
type MilliSec = Int type MilliSec = Int
setProfilingLevel :: (MonadIO' m) => ProfilingLevel -> Maybe MilliSec -> Action m () setProfilingLevel :: (MonadIO m) => ProfilingLevel -> Maybe MilliSec -> Action m ()
setProfilingLevel p mSlowMs = setProfilingLevel p mSlowMs =
runCommand (["profile" =: fromEnum p] ++ ("slowms" =? mSlowMs)) >> return () runCommand (["profile" =: fromEnum p] ++ ("slowms" =? mSlowMs)) >> return ()
-- ** Database -- ** Database
dbStats :: (MonadIO' m) => Action m Document dbStats :: (MonadIO m) => Action m Document
dbStats = runCommand ["dbstats" =: (1 :: Int)] dbStats = runCommand ["dbstats" =: (1 :: Int)]
currentOp :: (MonadIO m) => Action m (Maybe Document) currentOp :: (MonadIO m) => Action m (Maybe Document)
@ -291,7 +291,7 @@ killOp op = findOne (select ["op" =: op] "$cmd.sys.killop")
-- ** Server -- ** Server
serverStatus :: (MonadIO' m) => Action m Document serverStatus :: (MonadIO m) => Action m Document
serverStatus = useDb admin $ runCommand ["serverStatus" =: (1 :: Int)] serverStatus = useDb admin $ runCommand ["serverStatus" =: (1 :: Int)]

52
Database/MongoDB/Connection.hs
View file

@ -4,7 +4,7 @@
module Database.MongoDB.Connection ( module Database.MongoDB.Connection (
-- * Util -- * Util
Secs, IOE, runIOE, Secs,
-- * Connection -- * Connection
Pipe, close, isClosed, Pipe, close, isClosed,
-- * Server -- * Server
@ -25,12 +25,11 @@ import System.IO.Unsafe (unsafePerformIO)
import System.Timeout (timeout) import System.Timeout (timeout)
import Text.ParserCombinators.Parsec (parse, many1, letter, digit, char, eof, import Text.ParserCombinators.Parsec (parse, many1, letter, digit, char, eof,
spaces, try, (<|>)) spaces, try, (<|>))
import qualified Control.Exception as E
import qualified Data.List as List import qualified Data.List as List
import Control.Monad.Identity (runIdentity) import Control.Monad.Identity (runIdentity)
import Control.Monad.Error (ErrorT(..), lift, throwError) import Control.Monad.Error (throwError)
import Control.Concurrent.MVar.Lifted (MVar, newMVar, withMVar, modifyMVar, import Control.Concurrent.MVar.Lifted (MVar, newMVar, withMVar, modifyMVar,
readMVar) readMVar)
import Data.Bson (Document, at, (=:)) import Data.Bson (Document, at, (=:))
@ -40,16 +39,16 @@ import qualified Data.Bson as B
import qualified Data.Text as T import qualified Data.Text as T
import Database.MongoDB.Internal.Protocol (Pipe, newPipe) import Database.MongoDB.Internal.Protocol (Pipe, newPipe)
import Database.MongoDB.Internal.Util (untilSuccess, liftIOE, runIOE, import Database.MongoDB.Internal.Util (untilSuccess, liftIOE,
updateAssocs, shuffle, mergesortM) updateAssocs, shuffle, mergesortM)
import Database.MongoDB.Query (Command, Failure(ConnectionFailure), access, import Database.MongoDB.Query (Command, Failure(ConnectionFailure), access,
slaveOk, runCommand) slaveOk, runCommand)
import System.IO.Pipeline (IOE, close, isClosed) import System.IO.Pipeline (close, isClosed)
adminCommand :: Command -> Pipe -> IOE Document adminCommand :: Command -> Pipe -> IO Document
-- ^ Run command against admin database on server connected to pipe. Fail if connection fails. -- ^ Run command against admin database on server connected to pipe. Fail if connection fails.
adminCommand cmd pipe = adminCommand cmd pipe =
liftIOE failureToIOError . ErrorT $ access pipe slaveOk "admin" $ runCommand cmd liftIOE failureToIOError $ access pipe slaveOk "admin" $ runCommand cmd
where where
failureToIOError (ConnectionFailure e) = e failureToIOError (ConnectionFailure e) = e
failureToIOError e = userError $ show e failureToIOError e = userError $ show e
@ -102,17 +101,16 @@ globalConnectTimeout :: IORef Secs
globalConnectTimeout = unsafePerformIO (newIORef 6) globalConnectTimeout = unsafePerformIO (newIORef 6)
{-# NOINLINE globalConnectTimeout #-} {-# NOINLINE globalConnectTimeout #-}
connect :: Host -> IOE Pipe connect :: Host -> IO Pipe
-- ^ Connect to Host returning pipelined TCP connection. Throw IOError if connection refused or no response within 'globalConnectTimeout'. -- ^ Connect to Host returning pipelined TCP connection. Throw IOError if connection refused or no response within 'globalConnectTimeout'.
connect h = lift (readIORef globalConnectTimeout) >>= flip connect' h connect h = readIORef globalConnectTimeout >>= flip connect' h
connect' :: Secs -> Host -> IOE Pipe connect' :: Secs -> Host -> IO Pipe
-- ^ Connect to Host returning pipelined TCP connection. Throw IOError if connection refused or no response within given number of seconds. -- ^ Connect to Host returning pipelined TCP connection. Throw IOError if connection refused or no response within given number of seconds.
connect' timeoutSecs (Host hostname port) = do connect' timeoutSecs (Host hostname port) = do
handle <- ErrorT . E.try $ do
mh <- timeout (round $ timeoutSecs * 1000000) (connectTo hostname port) mh <- timeout (round $ timeoutSecs * 1000000) (connectTo hostname port)
maybe (ioError $ userError "connect timed out") return mh handle <- maybe (ioError $ userError "connect timed out") return mh
lift $ newPipe handle newPipe handle
-- * Replica Set -- * Replica Set
@ -125,11 +123,11 @@ replSetName :: ReplicaSet -> Text
-- ^ name of connected replica set -- ^ name of connected replica set
replSetName (ReplicaSet rsName _ _) = rsName replSetName (ReplicaSet rsName _ _) = rsName
openReplicaSet :: (ReplicaSetName, [Host]) -> IOE ReplicaSet openReplicaSet :: (ReplicaSetName, [Host]) -> IO ReplicaSet
-- ^ Open connections (on demand) to servers in replica set. Supplied hosts is seed list. At least one of them must be a live member of the named replica set, otherwise fail. The value of 'globalConnectTimeout' at the time of this call is the timeout used for future member connect attempts. To use your own value call 'openReplicaSet\'' instead. -- ^ Open connections (on demand) to servers in replica set. Supplied hosts is seed list. At least one of them must be a live member of the named replica set, otherwise fail. The value of 'globalConnectTimeout' at the time of this call is the timeout used for future member connect attempts. To use your own value call 'openReplicaSet\'' instead.
openReplicaSet rsSeed = lift (readIORef globalConnectTimeout) >>= flip openReplicaSet' rsSeed openReplicaSet rsSeed = readIORef globalConnectTimeout >>= flip openReplicaSet' rsSeed
openReplicaSet' :: Secs -> (ReplicaSetName, [Host]) -> IOE ReplicaSet openReplicaSet' :: Secs -> (ReplicaSetName, [Host]) -> IO ReplicaSet
-- ^ Open connections (on demand) to servers in replica set. Supplied hosts is seed list. At least one of them must be a live member of the named replica set, otherwise fail. Supplied seconds timeout is used for connect attempts to members. -- ^ Open connections (on demand) to servers in replica set. Supplied hosts is seed list. At least one of them must be a live member of the named replica set, otherwise fail. Supplied seconds timeout is used for connect attempts to members.
openReplicaSet' timeoutSecs (rsName, seedList) = do openReplicaSet' timeoutSecs (rsName, seedList) = do
vMembers <- newMVar (map (, Nothing) seedList) vMembers <- newMVar (map (, Nothing) seedList)
@ -141,7 +139,7 @@ closeReplicaSet :: ReplicaSet -> IO ()
-- ^ Close all connections to replica set -- ^ Close all connections to replica set
closeReplicaSet (ReplicaSet _ vMembers _) = withMVar vMembers $ mapM_ (maybe (return ()) close . snd) closeReplicaSet (ReplicaSet _ vMembers _) = withMVar vMembers $ mapM_ (maybe (return ()) close . snd)
primary :: ReplicaSet -> IOE Pipe primary :: ReplicaSet -> IO Pipe
-- ^ Return connection to current primary of replica set. Fail if no primary available. -- ^ Return connection to current primary of replica set. Fail if no primary available.
primary rs@(ReplicaSet rsName _ _) = do primary rs@(ReplicaSet rsName _ _) = do
mHost <- statedPrimary <$> updateMembers rs mHost <- statedPrimary <$> updateMembers rs
@ -149,19 +147,19 @@ primary rs@(ReplicaSet rsName _ _) = do
Just host' -> connection rs Nothing host' Just host' -> connection rs Nothing host'
Nothing -> throwError $ userError $ "replica set " ++ T.unpack rsName ++ " has no primary" Nothing -> throwError $ userError $ "replica set " ++ T.unpack rsName ++ " has no primary"
secondaryOk :: ReplicaSet -> IOE Pipe secondaryOk :: ReplicaSet -> IO Pipe
-- ^ Return connection to a random secondary, or primary if no secondaries available. -- ^ Return connection to a random secondary, or primary if no secondaries available.
secondaryOk rs = do secondaryOk rs = do
info <- updateMembers rs info <- updateMembers rs
hosts <- lift $ shuffle (possibleHosts info) hosts <- shuffle (possibleHosts info)
let hosts' = maybe hosts (\p -> delete p hosts ++ [p]) (statedPrimary info) let hosts' = maybe hosts (\p -> delete p hosts ++ [p]) (statedPrimary info)
untilSuccess (connection rs Nothing) hosts' untilSuccess (connection rs Nothing) hosts'
routedHost :: ((Host, Bool) -> (Host, Bool) -> IOE Ordering) -> ReplicaSet -> IOE Pipe routedHost :: ((Host, Bool) -> (Host, Bool) -> IO Ordering) -> ReplicaSet -> IO Pipe
-- ^ Return a connection to a host using a user-supplied sorting function, which sorts based on a tuple containing the host and a boolean indicating whether the host is primary. -- ^ Return a connection to a host using a user-supplied sorting function, which sorts based on a tuple containing the host and a boolean indicating whether the host is primary.
routedHost f rs = do routedHost f rs = do
info <- updateMembers rs info <- updateMembers rs
hosts <- lift $ shuffle (possibleHosts info) hosts <- shuffle (possibleHosts info)
let addIsPrimary h = (h, if Just h == statedPrimary info then True else False) let addIsPrimary h = (h, if Just h == statedPrimary info then True else False)
hosts' <- mergesortM (\a b -> f (addIsPrimary a) (addIsPrimary b)) hosts hosts' <- mergesortM (\a b -> f (addIsPrimary a) (addIsPrimary b)) hosts
untilSuccess (connection rs Nothing) hosts' untilSuccess (connection rs Nothing) hosts'
@ -177,13 +175,13 @@ possibleHosts :: ReplicaInfo -> [Host]
-- ^ Non-arbiter, non-hidden members of replica set -- ^ Non-arbiter, non-hidden members of replica set
possibleHosts (_, info) = map readHostPort $ at "hosts" info possibleHosts (_, info) = map readHostPort $ at "hosts" info
updateMembers :: ReplicaSet -> IOE ReplicaInfo updateMembers :: ReplicaSet -> IO ReplicaInfo
-- ^ Fetch replica info from any server and update members accordingly -- ^ Fetch replica info from any server and update members accordingly
updateMembers rs@(ReplicaSet _ vMembers _) = do updateMembers rs@(ReplicaSet _ vMembers _) = do
(host', info) <- untilSuccess (fetchReplicaInfo rs) =<< readMVar vMembers (host', info) <- untilSuccess (fetchReplicaInfo rs) =<< readMVar vMembers
modifyMVar vMembers $ \members -> do modifyMVar vMembers $ \members -> do
let ((members', old), new) = intersection (map readHostPort $ at "hosts" info) members let ((members', old), new) = intersection (map readHostPort $ at "hosts" info) members
lift $ forM_ old $ \(_, mPipe) -> maybe (return ()) close mPipe forM_ old $ \(_, mPipe) -> maybe (return ()) close mPipe
return (members' ++ map (, Nothing) new, (host', info)) return (members' ++ map (, Nothing) new, (host', info))
where where
intersection :: (Eq k) => [k] -> [(k, v)] -> (([(k, v)], [(k, v)]), [k]) intersection :: (Eq k) => [k] -> [(k, v)] -> (([(k, v)], [(k, v)]), [k])
@ -191,7 +189,7 @@ updateMembers rs@(ReplicaSet _ vMembers _) = do
assocKeys = map fst assocs assocKeys = map fst assocs
inKeys = intersect keys assocKeys inKeys = intersect keys assocKeys
fetchReplicaInfo :: ReplicaSet -> (Host, Maybe Pipe) -> IOE ReplicaInfo fetchReplicaInfo :: ReplicaSet -> (Host, Maybe Pipe) -> IO ReplicaInfo
-- Connect to host and fetch replica info from host creating new connection if missing or closed (previously failed). Fail if not member of named replica set. -- Connect to host and fetch replica info from host creating new connection if missing or closed (previously failed). Fail if not member of named replica set.
fetchReplicaInfo rs@(ReplicaSet rsName _ _) (host', mPipe) = do fetchReplicaInfo rs@(ReplicaSet rsName _ _) (host', mPipe) = do
pipe <- connection rs mPipe host' pipe <- connection rs mPipe host'
@ -201,15 +199,15 @@ fetchReplicaInfo rs@(ReplicaSet rsName _ _) (host', mPipe) = do
Just setName | setName /= rsName -> throwError $ userError $ show host' ++ " not a member of replica set " ++ T.unpack rsName ++ ": " ++ show info Just setName | setName /= rsName -> throwError $ userError $ show host' ++ " not a member of replica set " ++ T.unpack rsName ++ ": " ++ show info
Just _ -> return (host', info) Just _ -> return (host', info)
connection :: ReplicaSet -> Maybe Pipe -> Host -> IOE Pipe connection :: ReplicaSet -> Maybe Pipe -> Host -> IO Pipe
-- ^ Return new or existing connection to member of replica set. If pipe is already known for host it is given, but we still test if it is open. -- ^ Return new or existing connection to member of replica set. If pipe is already known for host it is given, but we still test if it is open.
connection (ReplicaSet _ vMembers timeoutSecs) mPipe host' = connection (ReplicaSet _ vMembers timeoutSecs) mPipe host' =
maybe conn (\p -> lift (isClosed p) >>= \bad -> if bad then conn else return p) mPipe maybe conn (\p -> isClosed p >>= \bad -> if bad then conn else return p) mPipe
where where
conn = modifyMVar vMembers $ \members -> do conn = modifyMVar vMembers $ \members -> do
let new = connect' timeoutSecs host' >>= \pipe -> return (updateAssocs host' (Just pipe) members, pipe) let new = connect' timeoutSecs host' >>= \pipe -> return (updateAssocs host' (Just pipe) members, pipe)
case List.lookup host' members of case List.lookup host' members of
Just (Just pipe) -> lift (isClosed pipe) >>= \bad -> if bad then new else return (members, pipe) Just (Just pipe) -> isClosed pipe >>= \bad -> if bad then new else return (members, pipe)
_ -> new _ -> new

16
Database/MongoDB/Internal/Protocol.hs
View file

@ -24,7 +24,6 @@ module Database.MongoDB.Internal.Protocol (
import Control.Applicative ((<$>)) import Control.Applicative ((<$>))
import Control.Arrow ((***)) import Control.Arrow ((***))
import Control.Exception (try)
import Control.Monad (forM_, replicateM, unless) import Control.Monad (forM_, replicateM, unless)
import Data.Binary.Get (Get, runGet) import Data.Binary.Get (Get, runGet)
import Data.Binary.Put (Put, runPut) import Data.Binary.Put (Put, runPut)
@ -36,7 +35,6 @@ import System.IO.Unsafe (unsafePerformIO)
import qualified Data.ByteString.Lazy as L import qualified Data.ByteString.Lazy as L
import Control.Monad.Error (ErrorT(..))
import Control.Monad.Trans (MonadIO, liftIO) import Control.Monad.Trans (MonadIO, liftIO)
import Data.Bson (Document) import Data.Bson (Document)
import Data.Bson.Binary (getDocument, putDocument, getInt32, putInt32, getInt64, import Data.Bson.Binary (getDocument, putDocument, getInt32, putInt32, getInt64,
@ -48,7 +46,7 @@ import qualified Data.Text as T
import qualified Data.Text.Encoding as TE import qualified Data.Text.Encoding as TE
import Database.MongoDB.Internal.Util (whenJust, hGetN, bitOr, byteStringHex) import Database.MongoDB.Internal.Util (whenJust, hGetN, bitOr, byteStringHex)
import System.IO.Pipeline (IOE, Pipeline, newPipeline, IOStream(..)) import System.IO.Pipeline (Pipeline, newPipeline, IOStream(..))
import qualified System.IO.Pipeline as P import qualified System.IO.Pipeline as P
@ -61,11 +59,11 @@ newPipe :: Handle -> IO Pipe
-- ^ Create pipe over handle -- ^ Create pipe over handle
newPipe handle = newPipeline $ IOStream (writeMessage handle) (readMessage handle) (hClose handle) newPipe handle = newPipeline $ IOStream (writeMessage handle) (readMessage handle) (hClose handle)
send :: Pipe -> [Notice] -> IOE () send :: Pipe -> [Notice] -> IO ()
-- ^ Send notices as a contiguous batch to server with no reply. Throw IOError if connection fails. -- ^ Send notices as a contiguous batch to server with no reply. Throw IOError if connection fails.
send pipe notices = P.send pipe (notices, Nothing) send pipe notices = P.send pipe (notices, Nothing)
call :: Pipe -> [Notice] -> Request -> IOE (IOE Reply) call :: Pipe -> [Notice] -> Request -> IO (IO Reply)
-- ^ Send notices and request as a contiguous batch to server and return reply promise, which will block when invoked until reply arrives. This call and resulting promise will throw IOError if connection fails. -- ^ Send notices and request as a contiguous batch to server and return reply promise, which will block when invoked until reply arrives. This call and resulting promise will throw IOError if connection fails.
call pipe notices request = do call pipe notices request = do
requestId <- genRequestId requestId <- genRequestId
@ -81,9 +79,9 @@ type Message = ([Notice], Maybe (Request, RequestId))
-- ^ A write notice(s) with getLastError request, or just query request. -- ^ A write notice(s) with getLastError request, or just query request.
-- Note, that requestId will be out of order because request ids will be generated for notices after the request id supplied was generated. This is ok because the mongo server does not care about order just uniqueness. -- Note, that requestId will be out of order because request ids will be generated for notices after the request id supplied was generated. This is ok because the mongo server does not care about order just uniqueness.
writeMessage :: Handle -> Message -> IOE () writeMessage :: Handle -> Message -> IO ()
-- ^ Write message to socket -- ^ Write message to socket
writeMessage handle (notices, mRequest) = ErrorT . try $ do writeMessage handle (notices, mRequest) = do
forM_ notices $ \n -> writeReq . (Left n,) =<< genRequestId forM_ notices $ \n -> writeReq . (Left n,) =<< genRequestId
whenJust mRequest $ writeReq . (Right *** id) whenJust mRequest $ writeReq . (Right *** id)
hFlush handle hFlush handle
@ -99,9 +97,9 @@ writeMessage handle (notices, mRequest) = ErrorT . try $ do
type Response = (ResponseTo, Reply) type Response = (ResponseTo, Reply)
-- ^ Message received from a Mongo server in response to a Request -- ^ Message received from a Mongo server in response to a Request
readMessage :: Handle -> IOE Response readMessage :: Handle -> IO Response
-- ^ read response from socket -- ^ read response from socket
readMessage handle = ErrorT $ try readResp where readMessage handle = readResp where
readResp = do readResp = do
len <- fromEnum . decodeSize <$> hGetN handle 4 len <- fromEnum . decodeSize <$> hGetN handle 4
runGet getReply <$> hGetN handle len runGet getReply <$> hGetN handle len

19
Database/MongoDB/Internal/Util.hs
View file

@ -7,9 +7,8 @@
module Database.MongoDB.Internal.Util where module Database.MongoDB.Internal.Util where
import Control.Applicative (Applicative(..), (<$>)) import Control.Applicative ((<$>))
import Control.Arrow (left) import Control.Exception (assert, handle, throwIO, Exception)
import Control.Exception (assert)
import Control.Monad (liftM, liftM2) import Control.Monad (liftM, liftM2)
import Data.Bits (Bits, (.|.)) import Data.Bits (Bits, (.|.))
import Data.Word (Word8) import Data.Word (Word8)
@ -23,7 +22,7 @@ import System.Random.Shuffle (shuffle')
import qualified Data.ByteString.Lazy as L import qualified Data.ByteString.Lazy as L
import qualified Data.ByteString as S import qualified Data.ByteString as S
import Control.Monad.Error (MonadError(..), ErrorT(..), Error(..)) import Control.Monad.Error (MonadError(..), Error(..))
import Control.Monad.Trans (MonadIO, liftIO) import Control.Monad.Trans (MonadIO, liftIO)
import Data.Bson import Data.Bson
import Data.Text (Text) import Data.Text (Text)
@ -36,10 +35,6 @@ deriving instance Eq PortID
#endif #endif
deriving instance Ord PortID deriving instance Ord PortID
-- | MonadIO with extra Applicative and Functor superclasses
class (MonadIO m, Applicative m, Functor m) => MonadIO' m
instance (MonadIO m, Applicative m, Functor m) => MonadIO' m
-- | A monadic sort implementation derived from the non-monadic one in ghc's Prelude -- | A monadic sort implementation derived from the non-monadic one in ghc's Prelude
mergesortM :: Monad m => (a -> a -> m Ordering) -> [a] -> m [a] mergesortM :: Monad m => (a -> a -> m Ordering) -> [a] -> m [a]
mergesortM cmp = mergesortM' cmp . map wrap mergesortM cmp = mergesortM' cmp . map wrap
@ -87,13 +82,9 @@ untilSuccess' _ f (x : xs) = catchError (f x) (\e -> untilSuccess' e f xs)
whenJust :: (Monad m) => Maybe a -> (a -> m ()) -> m () whenJust :: (Monad m) => Maybe a -> (a -> m ()) -> m ()
whenJust mVal act = maybe (return ()) act mVal whenJust mVal act = maybe (return ()) act mVal
liftIOE :: (MonadIO m) => (e -> e') -> ErrorT e IO a -> ErrorT e' m a liftIOE :: (MonadIO m, Exception e, Exception e') => (e -> e') -> IO a -> m a
-- ^ lift IOE monad to ErrorT monad over some MonadIO m -- ^ lift IOE monad to ErrorT monad over some MonadIO m
liftIOE f = ErrorT . liftIO . fmap (left f) . runErrorT liftIOE f = liftIO . handle (throwIO . f)
runIOE :: ErrorT IOError IO a -> IO a
-- ^ Run action while catching explicit error and rethrowing in IO monad
runIOE (ErrorT action) = action >>= either ioError return
updateAssocs :: (Eq k) => k -> v -> [(k, v)] -> [(k, v)] updateAssocs :: (Eq k) => k -> v -> [(k, v)] -> [(k, v)]
-- ^ Change or insert value of key in association list -- ^ Change or insert value of key in association list

186
Database/MongoDB/Query.hs
View file

@ -1,12 +1,13 @@
-- | Query and update documents -- | Query and update documents
{-# LANGUAGE OverloadedStrings, RecordWildCards, NamedFieldPuns, TupleSections, FlexibleContexts, FlexibleInstances, UndecidableInstances, MultiParamTypeClasses, GeneralizedNewtypeDeriving, StandaloneDeriving, TypeSynonymInstances, TypeFamilies, CPP #-} {-# LANGUAGE OverloadedStrings, RecordWildCards, NamedFieldPuns, TupleSections, FlexibleContexts, FlexibleInstances, UndecidableInstances, MultiParamTypeClasses, GeneralizedNewtypeDeriving, StandaloneDeriving, TypeSynonymInstances, TypeFamilies, CPP, DeriveDataTypeable #-}
module Database.MongoDB.Query ( module Database.MongoDB.Query (
-- * Monad -- * Monad
Action, access, Failure(..), ErrorCode, Action, access, Failure(..), ErrorCode,
AccessMode(..), GetLastError, master, slaveOk, accessMode, AccessMode(..), GetLastError, master, slaveOk, accessMode,
MonadDB(..), liftDB,
MongoContext, HasMongoContext(..),
-- * Database -- * Database
Database, allDatabases, useDb, thisDatabase, Database, allDatabases, useDb, thisDatabase,
-- ** Authentication -- ** Authentication
@ -43,12 +44,13 @@ module Database.MongoDB.Query (
) where ) where
import Prelude hiding (lookup) import Prelude hiding (lookup)
import Control.Applicative (Applicative, (<$>)) import Control.Exception (Exception, throwIO)
import Control.Monad (unless, replicateM, liftM) import Control.Monad (unless, replicateM, liftM)
import Data.Int (Int32) import Data.Int (Int32)
import Data.Maybe (listToMaybe, catMaybes) import Data.Maybe (listToMaybe, catMaybes)
import Data.Word (Word32) import Data.Word (Word32)
import Data.Monoid (mappend) import Data.Monoid (mappend)
import Data.Typeable (Typeable)
#if MIN_VERSION_base(4,6,0) #if MIN_VERSION_base(4,6,0)
import Control.Concurrent.MVar.Lifted (MVar, newMVar, mkWeakMVar, import Control.Concurrent.MVar.Lifted (MVar, newMVar, mkWeakMVar,
@ -57,17 +59,11 @@ import Control.Concurrent.MVar.Lifted (MVar, newMVar, mkWeakMVar,
import Control.Concurrent.MVar.Lifted (MVar, newMVar, addMVarFinalizer, import Control.Concurrent.MVar.Lifted (MVar, newMVar, addMVarFinalizer,
readMVar, modifyMVar) readMVar, modifyMVar)
#endif #endif
import Control.Monad.Base (MonadBase(liftBase)) import Control.Monad.Base (MonadBase)
import Control.Monad.Error (ErrorT, Error(..), MonadError, runErrorT, import Control.Monad.Error (Error(..))
throwError) import Control.Monad.Reader (MonadReader, ReaderT, runReaderT, ask, asks, local)
import Control.Monad.Reader (ReaderT, runReaderT, ask, asks, local) import Control.Monad.Trans (MonadIO, liftIO)
import Control.Monad.RWS (RWST) import Control.Monad.Trans.Control (MonadBaseControl(..))
import Control.Monad.State (StateT)
import Control.Monad.Trans (MonadIO, MonadTrans, lift, liftIO)
import Control.Monad.Trans.Control (ComposeSt, MonadBaseControl(..),
MonadTransControl(..), StM, StT,
defaultLiftBaseWith, defaultRestoreM)
import Control.Monad.Writer (WriterT, Monoid)
import Data.Bson (Document, Field(..), Label, Val, Value(String, Doc, Bool), import Data.Bson (Document, Field(..), Label, Val, Value(String, Doc, Bool),
Javascript, at, valueAt, lookup, look, genObjectId, (=:), Javascript, at, valueAt, lookup, look, genObjectId, (=:),
(=?)) (=?))
@ -83,7 +79,7 @@ import Database.MongoDB.Internal.Protocol (Reply(..), QueryOption(..),
qFullCollection, qBatchSize, qFullCollection, qBatchSize,
qSelector, qProjector), qSelector, qProjector),
pwKey) pwKey)
import Database.MongoDB.Internal.Util (MonadIO', loop, liftIOE, true1, (<.>)) import Database.MongoDB.Internal.Util (loop, liftIOE, true1, (<.>))
import qualified Database.MongoDB.Internal.Protocol as P import qualified Database.MongoDB.Internal.Protocol as P
#if !MIN_VERSION_base(4,6,0) #if !MIN_VERSION_base(4,6,0)
@ -92,31 +88,12 @@ import qualified Database.MongoDB.Internal.Protocol as P
-- * Monad -- * Monad
newtype Action m a = Action {unAction :: ErrorT Failure (ReaderT Context m) a} type Action = ReaderT MongoContext
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' -- ^ A monad on top of m (which must be a MonadIO) that may access the database and may fail with a DB 'Failure'
instance MonadBase b m => MonadBase b (Action m) where access :: (MonadIO m) => Pipe -> AccessMode -> Database -> Action m a -> m a
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. -- ^ 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.
access myPipe myAccessMode myDatabase (Action action) = runReaderT (runErrorT action) Context{..} access myPipe myAccessMode myDatabase action = runReaderT action MongoContext{..}
-- | A connection failure, or a read or write exception like cursor expired or inserting a duplicate key. -- | A connection failure, or a read or write exception like cursor expired or inserting a duplicate key.
-- Note, unexpected data from the server is not a Failure, rather it is a programming error (you should call 'error' in this case) because the client and server are incompatible and requires a programming change. -- Note, unexpected data from the server is not a Failure, rather it is a programming error (you should call 'error' in this case) because the client and server are incompatible and requires a programming change.
@ -127,7 +104,8 @@ data Failure =
| WriteFailure ErrorCode String -- ^ Error observed by getLastError after a write, error description is in string | WriteFailure ErrorCode String -- ^ Error observed by getLastError after a write, error description is in string
| DocNotFound Selection -- ^ 'fetch' found no document matching selection | DocNotFound Selection -- ^ 'fetch' found no document matching selection
| AggregateFailure String -- ^ 'aggregate' returned an error | AggregateFailure String -- ^ 'aggregate' returned an error
deriving (Show, Eq) deriving (Show, Eq, Typeable)
instance Exception Failure
type ErrorCode = Int type ErrorCode = Int
-- ^ Error code from getLastError or query failure -- ^ Error code from getLastError or query failure
@ -155,7 +133,7 @@ slaveOk = ReadStaleOk
accessMode :: (Monad m) => AccessMode -> Action m a -> Action m a accessMode :: (Monad m) => AccessMode -> Action m a -> Action m a
-- ^ Run action with given 'AccessMode' -- ^ Run action with given 'AccessMode'
accessMode mode (Action act) = Action $ local (\ctx -> ctx {myAccessMode = mode}) act accessMode mode act = local (\ctx -> ctx {myAccessMode = mode}) act
readMode :: AccessMode -> ReadMode readMode :: AccessMode -> ReadMode
readMode ReadStaleOk = StaleOk readMode ReadStaleOk = StaleOk
@ -167,85 +145,72 @@ writeMode UnconfirmedWrites = NoConfirm
writeMode (ConfirmWrites z) = Confirm z writeMode (ConfirmWrites z) = Confirm z
-- | Values needed when executing a db operation -- | Values needed when executing a db operation
data Context = Context { data MongoContext = MongoContext {
myPipe :: Pipe, -- ^ operations read/write to this pipelined TCP connection to a MongoDB server myPipe :: Pipe, -- ^ operations read/write to this pipelined TCP connection to a MongoDB server
myAccessMode :: AccessMode, -- ^ read/write operation will use this access mode myAccessMode :: AccessMode, -- ^ read/write operation will use this access mode
myDatabase :: Database } -- ^ operations query/update this database myDatabase :: Database } -- ^ operations query/update this database
myReadMode :: Context -> ReadMode myReadMode :: MongoContext -> ReadMode
myReadMode = readMode . myAccessMode myReadMode = readMode . myAccessMode
myWriteMode :: Context -> WriteMode myWriteMode :: MongoContext -> WriteMode
myWriteMode = writeMode . myAccessMode myWriteMode = writeMode . myAccessMode
send :: (MonadIO m) => [Notice] -> Action m () send :: (MonadIO m) => [Notice] -> Action m ()
-- ^ Send notices as a contiguous batch to server with no reply. Throw 'ConnectionFailure' if pipe fails. -- ^ Send notices as a contiguous batch to server with no reply. Throw 'ConnectionFailure' if pipe fails.
send ns = Action $ do send ns = do
pipe <- asks myPipe pipe <- asks myPipe
liftIOE ConnectionFailure $ P.send pipe ns liftIOE ConnectionFailure $ P.send pipe ns
call :: (MonadIO m) => [Notice] -> Request -> Action m (ErrorT Failure IO Reply) call :: (MonadIO m) => [Notice] -> Request -> Action m (IO Reply)
-- ^ Send notices and request as a contiguous batch to server and return reply promise, which will block when invoked until reply arrives. This call will throw 'ConnectionFailure' if pipe fails on send, and promise will throw 'ConnectionFailure' if pipe fails on receive. -- ^ Send notices and request as a contiguous batch to server and return reply promise, which will block when invoked until reply arrives. This call will throw 'ConnectionFailure' if pipe fails on send, and promise will throw 'ConnectionFailure' if pipe fails on receive.
call ns r = Action $ do call ns r = do
pipe <- asks myPipe pipe <- asks myPipe
promise <- liftIOE ConnectionFailure $ P.call pipe ns r promise <- liftIOE ConnectionFailure $ P.call pipe ns r
return (liftIOE ConnectionFailure promise) 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 HasMongoContext env where
class (Monad m, MonadBaseControl IO (BaseMonad m), Applicative (BaseMonad m), Functor (BaseMonad m)) => MonadDB m where mongoContext :: env -> MongoContext
type BaseMonad m :: * -> * instance HasMongoContext MongoContext where
liftDB :: Action (BaseMonad m) a -> m a mongoContext = id
instance (MonadBaseControl IO m, Applicative m, Functor m) => MonadDB (Action m) where liftDB :: (MonadReader env m, HasMongoContext env, MonadIO m)
type BaseMonad (Action m) = m => Action IO a
liftDB = id -> m a
liftDB m = do
instance (MonadDB m, Error e) => MonadDB (ErrorT e m) where env <- ask
type BaseMonad (ErrorT e m) = BaseMonad m liftIO $ runReaderT m (mongoContext env)
liftDB = lift . liftDB
instance (MonadDB m) => MonadDB (ReaderT r m) where
type BaseMonad (ReaderT r m) = BaseMonad m
liftDB = lift . liftDB
instance (MonadDB m) => MonadDB (StateT s m) where
type BaseMonad (StateT s m) = BaseMonad m
liftDB = lift . liftDB
instance (MonadDB m, Monoid w) => MonadDB (WriterT w m) where
type BaseMonad (WriterT w m) = BaseMonad m
liftDB = lift . liftDB
instance (MonadDB m, Monoid w) => MonadDB (RWST r w s m) where
type BaseMonad (RWST r w s m) = BaseMonad m
liftDB = lift . liftDB
-- * Database -- * Database
type Database = Text type Database = Text
allDatabases :: (MonadIO' m) => Action m [Database] allDatabases :: (MonadIO m) => Action m [Database]
-- ^ List all databases residing on server -- ^ List all databases residing on server
allDatabases = map (at "name") . at "databases" <$> useDb "admin" (runCommand1 "listDatabases") allDatabases = (map (at "name") . at "databases") `liftM` useDb "admin" (runCommand1 "listDatabases")
thisDatabase :: (Monad m) => Action m Database thisDatabase :: (Monad m) => Action m Database
-- ^ Current database in use -- ^ Current database in use
thisDatabase = Action $ asks myDatabase thisDatabase = asks myDatabase
useDb :: (Monad m) => Database -> Action m a -> Action m a useDb :: (Monad m) => Database -> Action m a -> Action m a
-- ^ Run action against given database -- ^ Run action against given database
useDb db (Action act) = Action $ local (\ctx -> ctx {myDatabase = db}) act useDb db act = local (\ctx -> ctx {myDatabase = db}) act
-- * Authentication -- * Authentication
auth :: (MonadIO' m) => Username -> Password -> Action m Bool auth :: (MonadIO m) => Username -> Password -> Action m Bool
-- ^ Authenticate with the current database (if server is running in secure mode). Return whether authentication was successful or not. Reauthentication is required for every new pipe. -- ^ Authenticate with the current database (if server is running in secure mode). Return whether authentication was successful or not. Reauthentication is required for every new pipe.
auth usr pss = do auth usr pss = do
n <- at "nonce" <$> runCommand ["getnonce" =: (1 :: Int)] n <- at "nonce" `liftM` runCommand ["getnonce" =: (1 :: Int)]
true1 "ok" <$> runCommand ["authenticate" =: (1 :: Int), "user" =: usr, "nonce" =: n, "key" =: pwKey n usr pss] true1 "ok" `liftM` runCommand ["authenticate" =: (1 :: Int), "user" =: usr, "nonce" =: n, "key" =: pwKey n usr pss]
-- * Collection -- * Collection
type Collection = Text type Collection = Text
-- ^ Collection name (not prefixed with database) -- ^ Collection name (not prefixed with database)
allCollections :: (MonadIO m, MonadBaseControl IO m, Functor m) => Action m [Collection] allCollections :: (MonadIO m, MonadBaseControl IO m) => Action m [Collection]
-- ^ List all collections in this database -- ^ List all collections in this database
allCollections = do allCollections = do
db <- thisDatabase db <- thisDatabase
@ -268,8 +233,13 @@ whereJS :: Selector -> Javascript -> Selector
whereJS sel js = ("$where" =: js) : sel whereJS sel js = ("$where" =: js) : sel
class Select aQueryOrSelection where class Select aQueryOrSelection where
<<<<<<< HEAD
select :: Selector -> Collection -> aQueryOrSelection select :: Selector -> Collection -> aQueryOrSelection
-- ^ 'Query' or 'Selection' that selects documents in collection that match selector. The choice of type depends on use, for example, in @'find' (select sel col)@ it is a Query, and in @'delete' (select sel col)@ it is a Selection. -- ^ 'Query' or 'Selection' that selects documents in collection that match selector. The choice of type depends on use, for example, in @'find' (select sel col)@ it is a Query, and in @'delete' (select sel col)@ it is a Selection.
=======
select :: Selector -> Collection -> aQueryOrSelection
-- ^ 'Query' or 'Selection' that selects documents in collection that match selector. The choice of type depends on use, for example, in @find (select sel col)@ it is a Query, and in @delete (select sel col)@ it is a Selection.
>>>>>>> refs/heads/pr-20
instance Select Selection where instance Select Selection where
select = Select select = Select
@ -286,22 +256,22 @@ data WriteMode =
write :: (MonadIO m) => Notice -> Action m () write :: (MonadIO m) => Notice -> Action m ()
-- ^ Send write to server, and if write-mode is 'Safe' then include getLastError request and raise 'WriteFailure' if it reports an error. -- ^ Send write to server, and if write-mode is 'Safe' then include getLastError request and raise 'WriteFailure' if it reports an error.
write notice = Action (asks myWriteMode) >>= \mode -> case mode of write notice = asks myWriteMode >>= \mode -> case mode of
NoConfirm -> send [notice] NoConfirm -> send [notice]
Confirm params -> do Confirm params -> do
let q = query (("getlasterror" =: (1 :: Int)) : params) "$cmd" let q = query (("getlasterror" =: (1 :: Int)) : params) "$cmd"
Batch _ _ [doc] <- fulfill =<< request [notice] =<< queryRequest False q {limit = 1} Batch _ _ [doc] <- fulfill =<< request [notice] =<< queryRequest False q {limit = 1}
case lookup "err" doc of case lookup "err" doc of
Nothing -> return () Nothing -> return ()
Just err -> throwError $ WriteFailure (maybe 0 id $ lookup "code" doc) err Just err -> liftIO $ throwIO $ WriteFailure (maybe 0 id $ lookup "code" doc) err
-- ** Insert -- ** Insert
insert :: (MonadIO' m) => Collection -> Document -> Action m Value insert :: (MonadIO m) => Collection -> Document -> Action m Value
-- ^ Insert document into collection and return its \"_id\" value, which is created automatically if not supplied -- ^ Insert document into collection and return its \"_id\" value, which is created automatically if not supplied
insert col doc = head <$> insertMany col [doc] insert col doc = head `liftM` insertMany col [doc]
insert_ :: (MonadIO' m) => Collection -> Document -> Action m () insert_ :: (MonadIO m) => Collection -> Document -> Action m ()
-- ^ Same as 'insert' except don't return _id -- ^ Same as 'insert' except don't return _id
insert_ col doc = insert col doc >> return () insert_ col doc = insert col doc >> return ()
@ -333,11 +303,11 @@ assignId :: Document -> IO Document
-- ^ Assign a unique value to _id field if missing -- ^ Assign a unique value to _id field if missing
assignId doc = if any (("_id" ==) . label) doc assignId doc = if any (("_id" ==) . label) doc
then return doc then return doc
else (\oid -> ("_id" =: oid) : doc) <$> genObjectId else (\oid -> ("_id" =: oid) : doc) `liftM` genObjectId
-- ** Update -- ** Update
save :: (MonadIO' m) => Collection -> Document -> Action m () save :: (MonadIO m) => Collection -> Document -> Action m ()
-- ^ Save document to collection, meaning insert it if its new (has no \"_id\" field) or update it if its not new (has \"_id\" field) -- ^ Save document to collection, meaning insert it if its new (has no \"_id\" field) or update it if its not new (has \"_id\" field)
save col doc = case look "_id" doc of save col doc = case look "_id" doc of
Nothing -> insert_ col doc Nothing -> insert_ col doc
@ -437,12 +407,12 @@ findOne q = do
fetch :: (MonadIO m) => Query -> Action m Document fetch :: (MonadIO m) => Query -> Action m Document
-- ^ Same as 'findOne' except throw 'DocNotFound' if none match -- ^ Same as 'findOne' except throw 'DocNotFound' if none match
fetch q = findOne q >>= maybe (throwError $ DocNotFound $ selection q) return fetch q = findOne q >>= maybe (liftIO $ throwIO $ DocNotFound $ selection q) return
-- | runs the findAndModify command. -- | runs the findAndModify command.
-- Returns a single updated document (new option is set to true). -- Returns a single updated document (new option is set to true).
-- Currently this API does not allow setting the remove option -- Currently this API does not allow setting the remove option
findAndModify :: (Applicative m, MonadIO m) findAndModify :: MonadIO m
=> Query => Query
-> Document -- ^ updates -> Document -- ^ updates
-> Action m (Either String Document) -> Action m (Either String Document)
@ -484,20 +454,20 @@ explain q = do -- same as findOne but with explain set to true
Batch _ _ docs <- fulfill =<< request [] =<< queryRequest True q {limit = 1} Batch _ _ docs <- fulfill =<< request [] =<< queryRequest True q {limit = 1}
return $ if null docs then error ("no explain: " ++ show q) else head docs return $ if null docs then error ("no explain: " ++ show q) else head docs
count :: (MonadIO' m) => Query -> Action m Int count :: (MonadIO m) => Query -> Action m Int
-- ^ Fetch number of documents satisfying query (including effect of skip and/or limit if present) -- ^ Fetch number of documents satisfying query (including effect of skip and/or limit if present)
count Query{selection = Select sel col, skip, limit} = at "n" <$> runCommand count Query{selection = Select sel col, skip, limit} = at "n" `liftM` runCommand
(["count" =: col, "query" =: sel, "skip" =: (fromIntegral skip :: Int32)] (["count" =: col, "query" =: sel, "skip" =: (fromIntegral skip :: Int32)]
++ ("limit" =? if limit == 0 then Nothing else Just (fromIntegral limit :: Int32))) ++ ("limit" =? if limit == 0 then Nothing else Just (fromIntegral limit :: Int32)))
distinct :: (MonadIO' m) => Label -> Selection -> Action m [Value] distinct :: (MonadIO m) => Label -> Selection -> Action m [Value]
-- ^ Fetch distinct values of field in selected documents -- ^ Fetch distinct values of field in selected documents
distinct k (Select sel col) = at "values" <$> runCommand ["distinct" =: col, "key" =: k, "query" =: sel] distinct k (Select sel col) = at "values" `liftM` runCommand ["distinct" =: col, "key" =: k, "query" =: sel]
queryRequest :: (Monad m) => Bool -> Query -> Action m (Request, Limit) queryRequest :: (Monad m) => Bool -> Query -> Action m (Request, Limit)
-- ^ Translate Query to Protocol.Query. If first arg is true then add special $explain attribute. -- ^ Translate Query to Protocol.Query. If first arg is true then add special $explain attribute.
queryRequest isExplain Query{..} = do queryRequest isExplain Query{..} = do
ctx <- Action ask ctx <- ask
return $ queryRequest' (myReadMode ctx) (myDatabase ctx) return $ queryRequest' (myReadMode ctx) (myDatabase ctx)
where where
queryRequest' rm db = (P.Query{..}, remainingLimit) where queryRequest' rm db = (P.Query{..}, remainingLimit) where
@ -523,7 +493,7 @@ batchSizeRemainingLimit batchSize limit = if limit == 0
where batchSize' = if batchSize == 1 then 2 else batchSize where batchSize' = if batchSize == 1 then 2 else batchSize
-- batchSize 1 is broken because server converts 1 to -1 meaning limit 1 -- batchSize 1 is broken because server converts 1 to -1 meaning limit 1
type DelayedBatch = ErrorT Failure IO Batch type DelayedBatch = IO Batch
-- ^ A promised batch which may fail -- ^ A promised batch which may fail
data Batch = Batch Limit CursorId [Document] data Batch = Batch Limit CursorId [Document]
@ -544,12 +514,12 @@ fromReply limit Reply{..} = do
-- If response flag indicates failure then throw it, otherwise do nothing -- If response flag indicates failure then throw it, otherwise do nothing
checkResponseFlag flag = case flag of checkResponseFlag flag = case flag of
AwaitCapable -> return () AwaitCapable -> return ()
CursorNotFound -> throwError $ CursorNotFoundFailure rCursorId CursorNotFound -> throwIO $ CursorNotFoundFailure rCursorId
QueryError -> throwError $ QueryFailure (at "code" $ head rDocuments) (at "$err" $ head rDocuments) QueryError -> throwIO $ QueryFailure (at "code" $ head rDocuments) (at "$err" $ head rDocuments)
fulfill :: (MonadIO m) => DelayedBatch -> Action m Batch fulfill :: (MonadIO m) => DelayedBatch -> Action m Batch
-- ^ Demand and wait for result, raise failure if exception -- ^ Demand and wait for result, raise failure if exception
fulfill = Action . liftIOE id fulfill = liftIO
-- *** Cursor -- *** Cursor
@ -604,11 +574,11 @@ next (Cursor fcol batchSize var) = modifyMVar var nextState where
then return (return $ Batch 0 0 [], Nothing) -- finished then return (return $ Batch 0 0 [], Nothing) -- finished
else fmap (,Nothing) $ nextBatch' fcol batchSize limit cid else fmap (,Nothing) $ nextBatch' fcol batchSize limit cid
nextN :: (MonadIO m, MonadBaseControl IO m, Functor m) => Int -> Cursor -> Action m [Document] nextN :: (MonadIO m, MonadBaseControl IO m) => Int -> Cursor -> Action m [Document]
-- ^ Return next N documents or less if end is reached -- ^ Return next N documents or less if end is reached
nextN n c = catMaybes <$> replicateM n (next c) nextN n c = catMaybes `liftM` replicateM n (next c)
rest :: (MonadIO m, MonadBaseControl IO m, Functor m) => Cursor -> Action m [Document] rest :: (MonadIO m, MonadBaseControl IO m) => Cursor -> Action m [Document]
-- ^ Return remaining documents in query result -- ^ Return remaining documents in query result
rest c = loop (next c) rest c = loop (next c)
@ -628,13 +598,13 @@ isCursorClosed (Cursor _ _ var) = do
type Pipeline = [Document] type Pipeline = [Document]
-- ^ The Aggregate Pipeline -- ^ The Aggregate Pipeline
aggregate :: MonadIO' m => Collection -> Pipeline -> Action m [Document] aggregate :: MonadIO m => Collection -> Pipeline -> Action m [Document]
-- ^ Runs an aggregate and unpacks the result. See <http://docs.mongodb.org/manual/core/aggregation/> for details. -- ^ Runs an aggregate and unpacks the result. See <http://docs.mongodb.org/manual/core/aggregation/> for details.
aggregate aColl agg = do aggregate aColl agg = do
response <- runCommand ["aggregate" =: aColl, "pipeline" =: agg] response <- runCommand ["aggregate" =: aColl, "pipeline" =: agg]
case true1 "ok" response of case true1 "ok" response of
True -> lookup "result" response True -> lookup "result" response
False -> throwError $ AggregateFailure $ at "errmsg" response False -> liftIO $ throwIO $ AggregateFailure $ at "errmsg" response
-- ** Group -- ** Group
@ -661,9 +631,9 @@ groupDocument Group{..} =
"initial" =: gInitial, "initial" =: gInitial,
"cond" =: gCond ] "cond" =: gCond ]
group :: (MonadIO' m) => Group -> Action m [Document] group :: (MonadIO m) => Group -> Action m [Document]
-- ^ Execute group query and return resulting aggregate value for each distinct key -- ^ Execute group query and return resulting aggregate value for each distinct key
group g = at "retval" <$> runCommand ["group" =: groupDocument g] group g = at "retval" `liftM` runCommand ["group" =: groupDocument g]
-- ** MapReduce -- ** MapReduce
@ -733,7 +703,7 @@ 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 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 mapReduce col map' red = MapReduce col map' red [] [] 0 Inline Nothing [] False
runMR :: (MonadIO m, MonadBaseControl IO m, Applicative m) => MapReduce -> Action m Cursor runMR :: (MonadIO m, MonadBaseControl IO m) => MapReduce -> Action m Cursor
-- ^ Run MapReduce and return cursor of results. Error if map/reduce fails (because of bad Javascript) -- ^ Run MapReduce and return cursor of results. Error if map/reduce fails (because of bad Javascript)
runMR mr = do runMR mr = do
res <- runMR' mr res <- runMR' mr
@ -743,7 +713,7 @@ runMR mr = do
Just x -> error $ "unexpected map-reduce result field: " ++ show x Just x -> error $ "unexpected map-reduce result field: " ++ show x
Nothing -> newCursor "" "" 0 $ return $ Batch 0 0 (at "results" res) Nothing -> newCursor "" "" 0 $ return $ Batch 0 0 (at "results" res)
runMR' :: (MonadIO' m) => MapReduce -> Action m MRResult runMR' :: (MonadIO m) => MapReduce -> Action m MRResult
-- ^ Run MapReduce and return a MR result document containing stats and the results if Inlined. Error if the map/reduce failed (because of bad Javascript). -- ^ Run MapReduce and return a MR result document containing stats and the results if Inlined. Error if the map/reduce failed (because of bad Javascript).
runMR' mr = do runMR' mr = do
doc <- runCommand (mrDocument mr) doc <- runCommand (mrDocument mr)
@ -754,18 +724,18 @@ runMR' mr = do
type Command = Document type Command = Document
-- ^ A command is a special query or action against the database. See <http://www.mongodb.org/display/DOCS/Commands> for details. -- ^ A command is a special query or action against the database. See <http://www.mongodb.org/display/DOCS/Commands> for details.
runCommand :: (MonadIO' m) => Command -> Action m Document runCommand :: (MonadIO m) => Command -> Action m Document
-- ^ Run command against the database and return its result -- ^ Run command against the database and return its result
runCommand c = maybe err id <$> findOne (query c "$cmd") where runCommand c = maybe err id `liftM` findOne (query c "$cmd") where
err = error $ "Nothing returned for command: " ++ show c err = error $ "Nothing returned for command: " ++ show c
runCommand1 :: (MonadIO' m) => Text -> Action m Document runCommand1 :: (MonadIO m) => Text -> Action m Document
-- ^ @runCommand1 foo = runCommand [foo =: 1]@ -- ^ @runCommand1 foo = runCommand [foo =: 1]@
runCommand1 c = runCommand [c =: (1 :: Int)] runCommand1 c = runCommand [c =: (1 :: Int)]
eval :: (MonadIO' m, Val v) => Javascript -> Action m v eval :: (MonadIO m, Val v) => Javascript -> Action m v
-- ^ Run code on server -- ^ Run code on server
eval code = at "retval" <$> runCommand ["$eval" =: code] eval code = at "retval" `liftM` runCommand ["$eval" =: code]
{- Authors: Tony Hannan <tony@10gen.com> {- Authors: Tony Hannan <tony@10gen.com>

25
System/IO/Pipeline.hs
View file

@ -12,7 +12,6 @@ A pipeline closes itself when a read or write causes an error, so you can detect
#endif #endif
module System.IO.Pipeline ( module System.IO.Pipeline (
IOE,
-- * IOStream -- * IOStream
IOStream(..), IOStream(..),
-- * Pipeline -- * Pipeline
@ -33,29 +32,19 @@ import Control.Concurrent.MVar.Lifted (MVar, newEmptyMVar, newMVar, withMVar,
import Control.Concurrent.MVar.Lifted (MVar, newEmptyMVar, newMVar, withMVar, import Control.Concurrent.MVar.Lifted (MVar, newEmptyMVar, newMVar, withMVar,
putMVar, readMVar, addMVarFinalizer) putMVar, readMVar, addMVarFinalizer)
#endif #endif
import Control.Monad.Error (ErrorT(ErrorT), runErrorT) import Control.Exception.Lifted (onException, throwIO, try)
#if !MIN_VERSION_base(4,6,0) #if !MIN_VERSION_base(4,6,0)
mkWeakMVar :: MVar a -> IO () -> IO () mkWeakMVar :: MVar a -> IO () -> IO ()
mkWeakMVar = addMVarFinalizer mkWeakMVar = addMVarFinalizer
#endif #endif
onException :: (Monad m) => ErrorT e m a -> m () -> ErrorT e m a
-- ^ If first action throws an exception then run second action then re-throw
onException (ErrorT action) releaser = ErrorT $ do
e <- action
either (const releaser) (const $ return ()) e
return e
type IOE = ErrorT IOError IO
-- ^ IO monad with explicit error
-- * IOStream -- * IOStream
-- | An IO sink and source where value of type @o@ are sent and values of type @i@ are received. -- | An IO sink and source where value of type @o@ are sent and values of type @i@ are received.
data IOStream i o = IOStream { data IOStream i o = IOStream {
writeStream :: o -> IOE (), writeStream :: o -> IO (),
readStream :: IOE i, readStream :: IO i,
closeStream :: IO () } closeStream :: IO () }
-- * Pipeline -- * Pipeline
@ -101,19 +90,19 @@ listen :: Pipeline i o -> IO ()
listen Pipeline{..} = do listen Pipeline{..} = do
stream <- readMVar vStream stream <- readMVar vStream
forever $ do forever $ do
e <- runErrorT $ readStream stream e <- try $ readStream stream
var <- readChan responseQueue var <- readChan responseQueue
putMVar var e putMVar var e
case e of case e of
Left err -> closeStream stream >> ioError err -- close and stop looping Left err -> closeStream stream >> ioError err -- close and stop looping
Right _ -> return () Right _ -> return ()
send :: Pipeline i o -> o -> IOE () send :: Pipeline i o -> o -> IO ()
-- ^ Send message to destination; the destination must not response (otherwise future 'call's will get these responses instead of their own). -- ^ Send message to destination; the destination must not response (otherwise future 'call's will get these responses instead of their own).
-- Throw IOError and close pipeline if send fails -- Throw IOError and close pipeline if send fails
send p@Pipeline{..} message = withMVar vStream (flip writeStream message) `onException` close p send p@Pipeline{..} message = withMVar vStream (flip writeStream message) `onException` close p
call :: Pipeline i o -> o -> IOE (IOE i) call :: Pipeline i o -> o -> IO (IO i)
-- ^ Send message to destination and return /promise/ of response from one message only. The destination must reply to the message (otherwise promises will have the wrong responses in them). -- ^ Send message to destination and return /promise/ of response from one message only. The destination must reply to the message (otherwise promises will have the wrong responses in them).
-- Throw IOError and closes pipeline if send fails, likewise for promised response. -- Throw IOError and closes pipeline if send fails, likewise for promised response.
call p@Pipeline{..} message = withMVar vStream doCall `onException` close p where call p@Pipeline{..} message = withMVar vStream doCall `onException` close p where
@ -121,7 +110,7 @@ call p@Pipeline{..} message = withMVar vStream doCall `onException` close p whe
writeStream stream message writeStream stream message
var <- newEmptyMVar var <- newEmptyMVar
liftIO $ writeChan responseQueue var liftIO $ writeChan responseQueue var
return $ ErrorT (readMVar var) -- return promise return $ readMVar var >>= either throwIO return -- return promise
{- Authors: Tony Hannan <tony@10gen.com> {- Authors: Tony Hannan <tony@10gen.com>

66
System/IO/Pool.hs
View file

@ -1,66 +0,0 @@
{- | Cycle through a set of resources (randomly), recreating them when they expire -}
{-# LANGUAGE RecordWildCards, NamedFieldPuns, FlexibleContexts #-}
module System.IO.Pool where
import Control.Applicative ((<$>))
import Control.Exception (assert)
import Data.Array.IO (IOArray, readArray, writeArray, newArray, newListArray,
getElems, getBounds, rangeSize, range)
import Data.Maybe (catMaybes)
import System.Random (randomRIO)
import Control.Concurrent.MVar.Lifted (MVar, newMVar, withMVar, modifyMVar_)
import Control.Monad.Error (ErrorT, Error)
import Control.Monad.Trans (liftIO)
-- | Creator, destroyer, and checker of resources of type r. Creator may throw error or type e.
data Factory e r = Factory {
newResource :: ErrorT e IO r,
killResource :: r -> IO (),
isExpired :: r -> IO Bool }
newPool :: Factory e r -> Int -> IO (Pool e r)
-- ^ Create new pool of initial max size, which must be >= 1
newPool f n = assert (n > 0) $ do
arr <- newArray (0, n-1) Nothing
var <- newMVar arr
return (Pool f var)
data Pool e r = Pool {factory :: Factory e r, resources :: MVar (IOArray Int (Maybe r))}
-- ^ Pool of maximum N resources. Resources may expire on their own or be killed. Resources will initially be created on demand up N resources then recycled in random fashion. N may be changed by resizing the pool. Random is preferred to round-robin to distribute effect of pathological use cases that use every Xth resource the most and N is a multiple of X.
-- Resources *must* close/kill themselves when garbage collected ('resize' relies on this).
aResource :: (Error e) => Pool e r -> ErrorT e IO r
-- ^ Return a random live resource in pool or create new one if expired or not yet created
aResource Pool{..} = withMVar resources $ \array -> do
i <- liftIO $ randomRIO =<< getBounds array
mr <- liftIO $ readArray array i
r <- maybe (new array i) (check array i) mr
return r
where
new array i = do
r <- newResource factory
liftIO $ writeArray array i (Just r)
return r
check array i r = do
bad <- liftIO $ isExpired factory r
if bad then new array i else return r
poolSize :: Pool e r -> IO Int
-- ^ current max size of pool
poolSize Pool{resources} = withMVar resources (fmap rangeSize . getBounds)
resize :: Pool e r -> Int -> IO ()
-- ^ resize max size of pool. When shrinking some resource will be dropped without closing since they may still be in use. They are expected to close themselves when garbage collected.
resize Pool{resources} n = modifyMVar_ resources $ \array -> do
rs <- take n <$> getElems array
array' <- newListArray (0, n-1) (rs ++ repeat Nothing)
return array'
killAll :: Pool e r -> IO ()
-- ^ Kill all resources in pool so subsequent access creates new ones
killAll (Pool Factory{killResource} resources) = withMVar resources $ \array -> do
mapM_ killResource . catMaybes =<< getElems array
mapM_ (\i -> writeArray array i Nothing) . range =<< getBounds array

1
mongoDB.cabal
View file

@ -46,4 +46,3 @@ Library
Database.MongoDB.Internal.Util Database.MongoDB.Internal.Util
Database.MongoDB.Query Database.MongoDB.Query
System.IO.Pipeline System.IO.Pipeline
System.IO.Pool