+{-# LANGUAGE NoMonomorphismRestriction #-}
module Main
where
import Control.Arrow ( (&&&), arr, returnA )
import Control.Monad ( when )
-import Control.Monad.IO.Class ( liftIO )
-import Database.Groundhog.Core ( PersistEntity )
-import Database.Groundhog.Sqlite (
+import Control.Monad.IO.Class ( MonadIO, liftIO )
+import Database.Groundhog (
defaultMigrationLogger,
insert,
migrate,
- runDbConn,
- runMigration,
+ runMigration )
+import Database.Groundhog.Core ( PersistBackend, PersistEntity )
+import Database.Groundhog.Generic ( runDbConn )
+import Database.Groundhog.Sqlite (
withSqliteConn )
-import Data.Maybe ( isNothing )
+import Database.Groundhog.Postgresql (
+ withPostgresqlConn )
import Data.Monoid ( (<>) )
import System.Console.CmdArgs ( def )
import System.Exit ( exitWith, ExitCode (ExitFailure) )
+import System.IO.Error ( catchIOError )
import Text.XML.HXT.Core (
ArrowXml,
IOStateArrow,
- SysConfigList,
XmlPickler,
XmlTree,
(>>>),
getAttrl,
getText,
hasName,
- no,
readDocument,
runX,
unpickleDoc,
- withPreserveComment,
- withRemoveWS,
- withSubstDTDEntities,
- withValidate,
- xpickle,
- yes )
+ xpickle )
+import Backend ( Backend(..) )
import CommandLine ( get_args )
import Configuration ( Configuration(..), merge_optional )
-import ExitCodes (
- exit_no_connection_string,
- exit_no_xml_files )
+import ConnectionString ( ConnectionString(..) )
+import ExitCodes ( exit_no_xml_files )
import Network.Services.TSN.Logging ( init_logging )
import qualified OptionalConfiguration as OC (
- OptionalConfiguration ( connection_string, xml_files ),
+ OptionalConfiguration ( xml_files ),
from_rc )
import Network.Services.TSN.Report (
report_info,
Listing ( player_listings ),
Message ( listings ),
PlayerListing )
+import qualified TSN.News as News ( Message )
+import Xml ( parse_opts )
-
--- | A list of options passed to 'readDocument' when we parse an XML
--- document. We don't validate because the DTDs from TSN are
--- wrong. As a result, we don't want to keep useless DTDs
--- areound. Thus we disable 'withSubstDTDEntities' which, when
--- combined with "withValidate no", prevents HXT from trying to read
--- the DTD at all.
---
-parse_opts :: SysConfigList
-parse_opts =
- [ withPreserveComment no,
- withRemoveWS yes,
- withSubstDTDEntities no,
- withValidate no ]
-
-
--- | We put the 'XmlTree' argument last so that it's easy to eta
--- reduce all of the import_foo functions that call this.
+-- | We put the 'Configuration' and 'XmlTree' arguments last so that
+-- it's easy to eta reduce all of the import_foo functions that call
+-- this.
--
-import_generic :: (XmlPickler a, PersistEntity b)
+import_generic :: (XmlPickler a, MonadIO m, PersistEntity b, PersistBackend m)
=> b -- ^ Dummy Listing instance needed for 'migrate'
-> (a -> [b]) -- ^ listings getter
-> XmlTree
- -> IO ()
-import_generic dummy g xml =
- withSqliteConn "foo.sqlite3" $ runDbConn $ do
- runMigration defaultMigrationLogger $ do
- migrate dummy
- let root_element = unpickleDoc xpickle xml
- case root_element of
- Nothing -> let msg = "Could not unpickle document in import_generic."
- in liftIO $ report_error msg
- Just elt -> mapM_ (\l -> insert l) (g elt)
+ -> m (Maybe Int) -- ^ Return the number of records inserted.
+import_generic dummy g xml = do
+ -- Needs NoMonomorphismRestriction to be allowed to return
+ -- different types in the two cases above.
+ runMigration defaultMigrationLogger $ migrate dummy
+ let root_element = unpickleDoc xpickle xml
+ case root_element of
+ Nothing -> do
+ let msg = "Could not unpickle document in import_generic."
+ liftIO $ report_error msg
+ return Nothing
+ Just elt -> do
+ ids <- mapM insert (g elt)
+ return $ Just (length ids)
+
+
+
+-- | Import TSN.News from an 'XmlTree'.
+import_news :: (MonadIO m, PersistBackend m)
+ => XmlTree
+ -> m (Maybe Int)
+import_news = -- This implementation is wrroooonnnnngggg.
+ import_generic
+ (undefined :: News.Message)
+ (\m -> [m] :: [News.Message]) -- Turn a Message into a [Message]
-- | Import TSN.Injuries from an 'XmlTree'.
-import_injuries :: XmlTree -> IO ()
+import_injuries :: (MonadIO m, PersistBackend m)
+ => XmlTree
+ -> m (Maybe Int)
import_injuries =
import_generic
(undefined :: Injuries.Listing)
Injuries.listings
-- | Import TSN.InjuriesDetail from an 'XmlTree'.
-import_injuries_detail :: XmlTree -> IO ()
+import_injuries_detail :: (MonadIO m, PersistBackend m)
+ => XmlTree
+ -> m (Maybe Int)
import_injuries_detail =
import_generic
(undefined :: InjuriesDetail.PlayerListing)
( (concatMap InjuriesDetail.player_listings) . InjuriesDetail.listings)
-import_file :: FilePath -> IO ()
-import_file path = do
- report_info $ "Attempting to import " ++ path ++ "."
- results <- runX $ readA >>> (doctypeA &&& returnA) >>> (arr import_with_dtd)
+import_file :: Configuration -> FilePath -> IO ()
+import_file cfg path = do
+ results <- catchIOError
+ parse_and_import
+ (\e -> do
+ report_error (show e)
+ report_error $ "Failed to import file " ++ path ++ "."
+ -- Return a nonempty list so we don't claim incorrectly that
+ -- we couldn't parse the DTD.
+ return [ Nothing ] )
+
case results of
+ -- If results' is empty, one of the arrows return "nothing."
[] -> report_error $ "Unable to determine DTD for file " ++ path ++ "."
- (r:_) -> r -- Need to do something with the result or it gets GCed?
- -- We do only expect one result fortunately.
+ (r:_) ->
+ case r of
+ Nothing -> return ()
+ Just cnt -> report_info $ "Successfully imported " ++
+ (show cnt) ++
+ " records from " ++ path ++ "."
where
-- | An arrow that reads a document into an 'XmlTree'.
readA :: IOStateArrow s a XmlTree
doctypeA :: ArrowXml a => a XmlTree String
doctypeA = getAttrl >>> hasName "doctype-SYSTEM" /> getText
+ -- | Combine the arrows above as well as the function below
+ -- (arrowized with 'arr') into an IO action that does everything
+ -- (parses and then runs the import on what was parsed).
+ --
+ -- The result of runX has type IO [IO (Maybe Int)]. We thus use
+ -- bind (>>=) and sequence to combine all of the IOs into one
+ -- big one outside of the list.
+ parse_and_import :: IO [Maybe Int]
+ parse_and_import =
+ runX (readA >>> (doctypeA &&& returnA) >>> (arr import_with_dtd))
+ >>=
+ sequence
+
-- | Takes a 'Doctype', 'XmlTree' pair and uses the 'Doctype' to
-- determine which function to call on the 'XmlTree'.
- import_with_dtd :: (String, XmlTree) -> IO ()
- import_with_dtd (dtd,xml)
- | dtd == "injuriesxml.dtd" = import_injuries xml
- | dtd == "Injuries_Detail_XML.dtd" = import_injuries_detail xml
- | otherwise = report_info $
- "Unrecognized DTD in " ++ path ++ ": " ++ dtd ++ "."
+ import_with_dtd :: (String, XmlTree) -> IO (Maybe Int)
+ import_with_dtd (dtd,xml) =
+ if backend cfg == Postgres
+ then withPostgresqlConn cs $ runDbConn $ importer xml
+ else withSqliteConn cs $ runDbConn $ importer xml
+ where
+ -- | Pull the real connection String out of the configuration.
+ cs :: String
+ cs = get_connection_string $ connection_string cfg
+
+ importer
+ | dtd == "injuriesxml.dtd" = import_injuries
+ | dtd == "Injuries_Detail_XML.dtd" = import_injuries_detail
+ | dtd == "newsxml.dtd" = import_news
+ | otherwise = \_ -> do -- Dummy arg simplifies the other cases.
+ let errmsg = "Unrecognized DTD in " ++ path ++ ": " ++ dtd ++ "."
+ liftIO $ report_info errmsg
+ return Nothing
+
main :: IO ()
report_error "No XML files given."
exitWith (ExitFailure exit_no_xml_files)
- -- There's a default connection string, namely the empty string, but
- -- it's not much use to us. So we make sure that we were given
- -- something explicitly.
- when (isNothing (OC.connection_string opt_config)) $ do
- report_error "No connection string supplied."
- exitWith (ExitFailure exit_no_connection_string)
-
-
- return ()
+ -- We don't do this in parallel (for now?) to keep the error
+ -- messages nice and linear.
+ mapM_ (import_file cfg) (OC.xml_files opt_config)
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