+ unpickleDoc )
+
+-- Local imports.
+import Backend ( Backend(..) )
+import CommandLine ( get_args )
+import Configuration ( Configuration(..), merge_optional )
+import ConnectionString ( ConnectionString(..) )
+import ExitCodes ( exit_no_xml_files )
+import qualified OptionalConfiguration as OC (
+ OptionalConfiguration ( xml_files ),
+ from_rc )
+import Network.Services.TSN.Report (
+ report_info,
+ report_error )
+import TSN.DbImport ( DbImport(..), ImportResult(..) )
+import TSN.Parse ( format_parse_error )
+import qualified TSN.XML.AutoRacingResults as AutoRacingResults (
+ dtd,
+ pickle_message )
+import qualified TSN.XML.AutoRacingSchedule as AutoRacingSchedule (
+ dtd,
+ pickle_message )
+import qualified TSN.XML.EarlyLine as EarlyLine (
+ dtd,
+ pickle_message )
+import qualified TSN.XML.GameInfo as GameInfo ( dtds, parse_xml )
+import qualified TSN.XML.Heartbeat as Heartbeat ( dtd, verify )
+import qualified TSN.XML.Injuries as Injuries ( dtd, pickle_message )
+import qualified TSN.XML.InjuriesDetail as InjuriesDetail (
+ dtd,
+ pickle_message )
+import qualified TSN.XML.MLBEarlyLine as MLBEarlyLine (
+ dtd,
+ pickle_message )
+import qualified TSN.XML.JFile as JFile ( dtd, pickle_message )
+import qualified TSN.XML.News as News (
+ dtd,
+ has_only_single_sms,
+ pickle_message )
+import qualified TSN.XML.Odds as Odds ( dtd, pickle_message )
+import qualified TSN.XML.ScheduleChanges as ScheduleChanges (
+ dtd,
+ pickle_message )
+import qualified TSN.XML.Scores as Scores ( dtd, pickle_message )
+import qualified TSN.XML.SportInfo as SportInfo ( dtds, parse_xml )
+import qualified TSN.XML.Weather as Weather (
+ dtd,
+ is_type1,
+ pickle_message,
+ teams_are_normal )
+import Xml ( DtdName(..), parse_opts )
+
+
+-- | This is where most of the work happens. This function is called
+-- on every file that we would like to import. It determines which
+-- importer to use based on the DTD, attempts to process the file,
+-- and then returns whether or not it was successful. If the file
+-- was processed, 'True' is returned. Otherwise, 'False' is
+-- returned.
+--
+-- The implementation is straightforward with one exception: since
+-- we are already in arrow world with HXT, the @import_with_dtd@
+-- function is lifted to an 'Arrow' as well with 'arr'. This
+-- prevents us from having to do a bunch of unwrapping and
+-- rewrapping with the associated error checking.
+--
+import_file :: Configuration -- ^ A configuration object needed for the
+ -- 'backend' and 'connection_string'.
+
+ -> FilePath -- ^ The path of the XML file to import.
+
+ -> IO Bool -- ^ True if we processed the file, False otherwise.
+import_file cfg path = do
+ results <- parse_and_import `catch` exception_handler
+ case results of
+ [] -> do
+ -- One of the arrows returned "nothing."
+ report_error $ "Unable to determine DTD for file " ++ path ++ "."
+ return False
+ (ImportFailed errmsg:_) -> do
+ report_error $ errmsg ++ " (" ++ path ++ ")"
+ return False
+ (ImportSkipped infomsg:_) -> do
+ -- We processed the message but didn't import anything. Return
+ -- "success" so that the XML file is deleted.
+ report_info infomsg
+ return True
+ (ImportSucceeded:_) -> do
+ report_info $ "Successfully imported " ++ path ++ "."
+ return True
+ (ImportUnsupported infomsg:_) -> do
+ -- For now we return "success" for these too, since we know we don't
+ -- support a bunch of DTDs and we want them to get deleted.
+ report_info infomsg
+ return True
+ where
+ -- | This will catch *any* exception, even the ones thrown by
+ -- Haskell's 'error' (which should never occur under normal
+ -- circumstances).
+ exception_handler :: SomeException -> IO [ImportResult]
+ exception_handler e = do
+ report_error (show e)
+ let errdesc = "Failed to import file " ++ path ++ "."
+ -- Return a nonempty list so we don't claim incorrectly that
+ -- we couldn't parse the DTD.
+ return [ImportFailed errdesc]
+
+ -- | An arrow that reads a document into an 'XmlTree'.
+ readA :: IOStateArrow s a XmlTree
+ readA = readDocument parse_opts path
+
+ -- | An arrow which parses the doctype "SYSTEM" of an 'XmlTree'.
+ -- We use these to determine the parser to use.
+ dtdnameA :: ArrowXml a => a XmlTree DtdName
+ dtdnameA = getAttrl >>> hasName "doctype-SYSTEM" /> getText >>^ DtdName
+
+ -- | 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 ImportResult]. We thus use
+ -- bind (>>=) and sequence to combine all of the IOs into one
+ -- big one outside of the list.
+ parse_and_import :: IO [ImportResult]
+ parse_and_import =
+ runX (readA >>> (dtdnameA &&& returnA) >>> (arr import_with_dtd))
+ >>=
+ sequence
+
+ -- | Takes a ('DtdName', 'XmlTree') pair and uses the 'DtdName'
+ -- to determine which function to call on the 'XmlTree'.
+ import_with_dtd :: (DtdName, XmlTree) -> IO ImportResult
+ import_with_dtd (DtdName dtd,xml)
+ -- We special-case the heartbeat so it doesn't have to run in
+ -- the database monad.
+ | dtd == Heartbeat.dtd = Heartbeat.verify xml
+ | otherwise =
+ -- We need NoMonomorphismRestriction here.
+ if backend cfg == Postgres
+ then withPostgresqlConn cs $ runDbConn importer
+ else withSqliteConn cs $ runDbConn importer
+ where
+ -- | Pull the real connection String out of the configuration.
+ --
+ cs :: String
+ cs = get_connection_string $ connection_string cfg
+
+ -- | Convenience; we use this everywhere below in 'importer'.
+ --
+ migrate_and_import m = dbmigrate m >> dbimport m
+
+ -- | The error message we return if unpickling fails.
+ --
+ errmsg = "Could not unpickle " ++ dtd ++ "."
+
+ -- | Try to migrate and import using the given pickler @f@;
+ -- if it works, return the result. Otherwise, return an
+ -- 'ImportFailed' along with our error message.
+ --
+ go f = maybe
+ (return $ ImportFailed errmsg)
+ migrate_and_import
+ (unpickleDoc f xml)
+
+ importer
+ | dtd == AutoRacingResults.dtd =
+ go AutoRacingResults.pickle_message
+
+ | dtd == AutoRacingSchedule.dtd =
+ go AutoRacingSchedule.pickle_message
+
+ | dtd == EarlyLine.dtd =
+ go EarlyLine.pickle_message
+
+ -- GameInfo and SportInfo appear last in the guards
+ | dtd == Injuries.dtd = go Injuries.pickle_message
+
+ | dtd == InjuriesDetail.dtd = go InjuriesDetail.pickle_message
+
+ | dtd == JFile.dtd = go JFile.pickle_message