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Make Failure an instance of Exception #24

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Make Failure an instance of Exception #24

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12 changes: 8 additions & 4 deletions Database/MongoDB/Query.hs
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Original file line number Diff line number Diff line change
@@ -1,11 +1,11 @@
-- | Query and update documents

{-# LANGUAGE OverloadedStrings, RecordWildCards, NamedFieldPuns, TupleSections, FlexibleContexts, FlexibleInstances, UndecidableInstances, MultiParamTypeClasses, GeneralizedNewtypeDeriving, StandaloneDeriving, TypeSynonymInstances, TypeFamilies #-}
{-# LANGUAGE OverloadedStrings, RecordWildCards, NamedFieldPuns, TupleSections, FlexibleContexts, FlexibleInstances, UndecidableInstances, MultiParamTypeClasses, GeneralizedNewtypeDeriving, StandaloneDeriving, TypeSynonymInstances, TypeFamilies, DeriveDataTypeable #-}

module Database.MongoDB.Query (
-- * Monad
Action, access, Failure(..), ErrorCode,
AccessMode(..), GetLastError, master, slaveOk, accessMode,
AccessMode(..), GetLastError, master, slaveOk, accessMode,
MonadDB(..),
-- * Database
Database, allDatabases, useDb, thisDatabase,
Expand Down Expand Up @@ -44,7 +44,9 @@ import Data.Bson (Document, at, valueAt, lookup, look, Field(..), (=:), (=?), La
import Database.MongoDB.Internal.Protocol (Pipe, Notice(..), Request(GetMore, qOptions, qFullCollection, qSkip, qBatchSize, qSelector, qProjector), Reply(..), QueryOption(..), ResponseFlag(..), InsertOption(..), UpdateOption(..), DeleteOption(..), CursorId, FullCollection, Username, Password, pwKey)
import qualified Database.MongoDB.Internal.Protocol as P (send, call, Request(Query))
import Database.MongoDB.Internal.Util (MonadIO', loop, liftIOE, true1, (<.>))
import Data.Typeable (Typeable)
import Control.Concurrent.MVar.Lifted
import Control.Exception (Exception)
import Control.Monad.Error
import Control.Monad.Reader
import Control.Monad.State (StateT)
Expand Down Expand Up @@ -93,7 +95,9 @@ data Failure =
| QueryFailure ErrorCode String -- ^ Query failed for some reason as described in the string
| WriteFailure ErrorCode String -- ^ Error observed by getLastError after a write, error description is in string
| DocNotFound Selection -- ^ 'fetch' found no document matching selection
deriving (Show, Eq)
deriving (Show, Eq, Typeable)

instance Exception Failure

type ErrorCode = Int
-- ^ Error code from getLastError or query failure
Expand Down Expand Up @@ -301,7 +305,7 @@ assignId doc = if X.any (("_id" ==) . label) doc
then return doc
else (\oid -> ("_id" =: oid) : doc) <$> genObjectId

-- ** Update
-- ** Update

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)
Expand Down