+ ArrowXml,
+ IOStateArrow,
+ XmlTree,
+ (>>>),
+ (/>),
+ getAttrl,
+ getText,
+ hasName,
+ readDocument,
+ runX )
+
+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 qualified TSN.XML.Heartbeat as Heartbeat ( verify )
+import qualified TSN.XML.Injuries as Injuries ( Listing )
+import qualified TSN.XML.InjuriesDetail as InjuriesDetail ( PlayerListing )
+import qualified TSN.XML.News as News ( Message )
+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, processes the file, and then
+-- returns whether or not any records were imported. If the file was
+-- processed, the number of records imported is returned (wrapped in
+-- a Just). Otherwise, if the file was not processed, 'Nothing' is
+-- returned.
+--
+-- 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 (Maybe Int) -- ^ If we processed the file, Just the number
+ -- of records imported. Otherwise, Nothing.
+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 Nothing
+ (ImportFailed errmsg:_) -> do
+ report_error errmsg
+ return Nothing
+ (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 $ Just 0
+ (ImportSucceeded count:_) -> do
+ report_info $ "Successfully imported " ++ (show count) ++
+ " records from " ++ path ++ "."
+ return $ Just count
+ (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 $ Just 0
+ 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 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" =
+ dbimport (undefined :: Injuries.Listing)