module Database.Persist.Sqlite
( withSqlitePool
, withSqliteConn
, createSqlitePool
, module Database.Persist.Sql
, SqliteConf (..)
, runSqlite
, wrapConnection
) where
import Database.Persist.Sql
import qualified Database.Sqlite as Sqlite
import Control.Monad.IO.Class (MonadIO (..))
import Control.Monad.Logger (NoLoggingT, runNoLoggingT)
import Data.List (intercalate)
import Data.IORef
import qualified Data.Map as Map
import Control.Monad.Trans.Control (control)
import qualified Control.Exception as E
import Data.Text (Text, pack)
import Control.Monad (mzero)
import Data.Aeson
import qualified Data.Text as T
import Data.Conduit
import qualified Data.Conduit.List as CL
import Control.Applicative
import Data.Int (Int64)
import Control.Monad ((>=>))
createSqlitePool :: MonadIO m => Text -> Int -> m ConnectionPool
createSqlitePool s = createSqlPool $ open' s
withSqlitePool :: (MonadBaseControl IO m, MonadIO m)
=> Text
-> Int
-> (ConnectionPool -> m a) -> m a
withSqlitePool s = withSqlPool $ open' s
withSqliteConn :: (MonadBaseControl IO m, MonadIO m)
=> Text -> (Connection -> m a) -> m a
withSqliteConn = withSqlConn . open'
open' :: Text -> IO Connection
open' = Sqlite.open >=> wrapConnection
wrapConnection :: Sqlite.Connection -> IO Connection
wrapConnection conn = do
smap <- newIORef $ Map.empty
return Connection
{ connPrepare = prepare' conn
, connStmtMap = smap
, connInsertSql = insertSql'
, connClose = Sqlite.close conn
, connMigrateSql = migrate'
, connBegin = helper "BEGIN"
, connCommit = helper "COMMIT"
, connRollback = ignoreExceptions . helper "ROLLBACK"
, connEscapeName = escape
, connNoLimit = "LIMIT -1"
, connRDBMS = "sqlite"
}
where
helper t getter = do
stmt <- getter t
_ <- stmtExecute stmt []
stmtReset stmt
ignoreExceptions = E.handle (\(_ :: E.SomeException) -> return ())
runSqlite :: (MonadBaseControl IO m, MonadIO m)
=> Text
-> SqlPersistT (NoLoggingT (ResourceT m)) a
-> m a
runSqlite connstr = runResourceT
. runNoLoggingT
. withSqliteConn connstr
. runSqlConn
prepare' :: Sqlite.Connection -> Text -> IO Statement
prepare' conn sql = do
stmt <- Sqlite.prepare conn sql
return Statement
{ stmtFinalize = Sqlite.finalize stmt
, stmtReset = Sqlite.reset conn stmt
, stmtExecute = execute' conn stmt
, stmtQuery = withStmt' conn stmt
}
insertSql' :: DBName -> [DBName] -> DBName -> InsertSqlResult
insertSql' t cols _ =
ISRInsertGet (pack ins) sel
where
sel = "SELECT last_insert_rowid()"
ins = concat
[ "INSERT INTO "
, escape' t
, "("
, intercalate "," $ map escape' cols
, ") VALUES("
, intercalate "," (map (const "?") cols)
, ")"
]
execute' :: Sqlite.Connection -> Sqlite.Statement -> [PersistValue] -> IO Int64
execute' conn stmt vals = flip finally (liftIO $ Sqlite.reset conn stmt) $ do
Sqlite.bind stmt vals
_ <- Sqlite.step stmt
Sqlite.changes conn
withStmt'
:: MonadResource m
=> Sqlite.Connection
-> Sqlite.Statement
-> [PersistValue]
-> Source m [PersistValue]
withStmt' conn stmt vals = bracketP
(Sqlite.bind stmt vals >> return stmt)
(Sqlite.reset conn)
(const pull)
where
pull = do
x <- liftIO $ Sqlite.step stmt
case x of
Sqlite.Done -> return ()
Sqlite.Row -> do
cols <- liftIO $ Sqlite.columns stmt
yield cols
pull
showSqlType :: SqlType -> Text
showSqlType SqlString = "VARCHAR"
showSqlType SqlInt32 = "INTEGER"
showSqlType SqlInt64 = "INTEGER"
showSqlType SqlReal = "REAL"
showSqlType (SqlNumeric precision scale) = pack $ "NUMERIC(" ++ show precision ++ "," ++ show scale ++ ")"
showSqlType SqlDay = "DATE"
showSqlType SqlTime = "TIME"
showSqlType SqlDayTimeZoned = "TIMESTAMP"
showSqlType SqlDayTime = "TIMESTAMP"
showSqlType SqlBlob = "BLOB"
showSqlType SqlBool = "BOOLEAN"
showSqlType (SqlOther t) = t
migrate' :: [EntityDef a]
-> (Text -> IO Statement)
-> EntityDef SqlType
-> IO (Either [Text] [(Bool, Text)])
migrate' allDefs getter val = do
let (cols, uniqs) = mkColumns allDefs val
let newSql = mkCreateTable False def (filter (not . safeToRemove val . cName) cols, uniqs)
stmt <- getter "SELECT sql FROM sqlite_master WHERE type='table' AND name=?"
oldSql' <- runResourceT
$ stmtQuery stmt [PersistText $ unDBName table] $$ go
case oldSql' of
Nothing -> return $ Right [(False, newSql)]
Just oldSql -> do
if oldSql == newSql
then return $ Right []
else do
sql <- getCopyTable allDefs getter val
return $ Right sql
where
def = val
table = entityDB def
go = do
x <- CL.head
case x of
Nothing -> return Nothing
Just [PersistText y] -> return $ Just y
Just y -> error $ "Unexpected result from sqlite_master: " ++ show y
safeToRemove :: EntityDef a -> DBName -> Bool
safeToRemove def (DBName colName)
= any (elem "SafeToRemove" . fieldAttrs)
$ filter ((== (DBName colName)) . fieldDB)
$ entityFields def
getCopyTable :: [EntityDef a]
-> (Text -> IO Statement)
-> EntityDef SqlType
-> IO [(Bool, Text)]
getCopyTable allDefs getter val = do
stmt <- getter $ pack $ "PRAGMA table_info(" ++ escape' table ++ ")"
oldCols' <- runResourceT $ stmtQuery stmt [] $$ getCols
let oldCols = map DBName $ filter (/= "id") oldCols'
let newCols = filter (not . safeToRemove def) $ map cName cols
let common = filter (`elem` oldCols) newCols
let id_ = entityID val
return [ (False, tmpSql)
, (False, copyToTemp $ id_ : common)
, (common /= filter (not . safeToRemove def) oldCols, pack dropOld)
, (False, newSql)
, (False, copyToFinal $ id_ : newCols)
, (False, pack dropTmp)
]
where
def = val
getCols = do
x <- CL.head
case x of
Nothing -> return []
Just (_:PersistText name:_) -> do
names <- getCols
return $ name : names
Just y -> error $ "Invalid result from PRAGMA table_info: " ++ show y
table = entityDB def
tableTmp = DBName $ unDBName table `T.append` "_backup"
(cols, uniqs) = mkColumns allDefs val
cols' = filter (not . safeToRemove def . cName) cols
newSql = mkCreateTable False def (cols', uniqs)
tmpSql = mkCreateTable True def { entityDB = tableTmp } (cols', uniqs)
dropTmp = "DROP TABLE " ++ escape' tableTmp
dropOld = "DROP TABLE " ++ escape' table
copyToTemp common = pack $ concat
[ "INSERT INTO "
, escape' tableTmp
, "("
, intercalate "," $ map escape' common
, ") SELECT "
, intercalate "," $ map escape' common
, " FROM "
, escape' table
]
copyToFinal newCols = pack $ concat
[ "INSERT INTO "
, T.unpack $ escape table
, " SELECT "
, intercalate "," $ map escape' newCols
, " FROM "
, escape' tableTmp
]
escape' :: DBName -> String
escape' = T.unpack . escape
mkCreateTable :: Bool -> EntityDef a -> ([Column], [UniqueDef]) -> Text
mkCreateTable isTemp entity (cols, uniqs) = T.concat
[ "CREATE"
, if isTemp then " TEMP" else ""
, " TABLE "
, escape $ entityDB entity
, "("
, escape $ entityID entity
, " INTEGER PRIMARY KEY"
, T.concat $ map sqlColumn cols
, T.concat $ map sqlUnique uniqs
, ")"
]
sqlColumn :: Column -> Text
sqlColumn (Column name isNull typ def _maxLen ref) = T.concat
[ ","
, escape name
, " "
, showSqlType typ
, if isNull then " NULL" else " NOT NULL"
, case def of
Nothing -> ""
Just d -> " DEFAULT " `T.append` d
, case ref of
Nothing -> ""
Just (table, _) -> " REFERENCES " `T.append` escape table
]
sqlUnique :: UniqueDef -> Text
sqlUnique (UniqueDef _ cname cols _) = T.concat
[ ",CONSTRAINT "
, escape cname
, " UNIQUE ("
, T.intercalate "," $ map (escape . snd) cols
, ")"
]
escape :: DBName -> Text
escape (DBName s) =
T.concat [q, T.concatMap go s, q]
where
q = T.singleton '"'
go '"' = "\"\""
go c = T.singleton c
data SqliteConf = SqliteConf
{ sqlDatabase :: Text
, sqlPoolSize :: Int
}
instance PersistConfig SqliteConf where
type PersistConfigBackend SqliteConf = SqlPersistT
type PersistConfigPool SqliteConf = ConnectionPool
createPoolConfig (SqliteConf cs size) = createSqlitePool cs size
runPool _ = runSqlPool
loadConfig (Object o) =
SqliteConf <$> o .: "database"
<*> o .: "poolsize"
loadConfig _ = mzero
finally :: MonadBaseControl IO m
=> m a
-> m b
-> m a
finally a sequel = control $ \runInIO ->
E.finally (runInIO a)
(runInIO sequel)