+-- | 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
+
+ -- 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
+
+ | dtd == News.dtd =
+ -- Some of the newsxml docs are busted in predictable ways.
+ -- We want them to "succeed" so that they're deleted.
+ -- We already know we can't parse them.
+ if News.has_only_single_sms xml
+ then go News.pickle_message
+ else do
+ let msg = "Unsupported newsxml.dtd with multiple SMS " ++
+ "(" ++ path ++ ")"
+ return $ ImportUnsupported msg
+ | dtd == Odds.dtd = go Odds.pickle_message
+
+ | dtd == ScheduleChanges.dtd = go ScheduleChanges.pickle_message
+
+ | dtd == Scores.dtd = go Scores.pickle_message
+
+ -- SportInfo and GameInfo appear last in the guards
+ | dtd == Weather.dtd =
+ -- Some of the weatherxml docs are busted in predictable ways.
+ -- We want them to "succeed" so that they're deleted.
+ -- We already know we can't parse them.
+ if Weather.is_type1 xml
+ then if Weather.teams_are_normal xml
+ then go Weather.pickle_message
+ else do
+ let msg = "Teams in reverse order in weatherxml.dtd" ++
+ " (" ++ path ++ ")"
+ return $ ImportUnsupported msg
+ else do
+ let msg = "Unsupported weatherxml.dtd type (" ++ path ++ ")"
+ return $ ImportUnsupported msg
+
+ | dtd `elem` GameInfo.dtds = do
+ let either_m = GameInfo.parse_xml dtd xml
+ case either_m of
+ -- This might give us a slightly better error
+ -- message than the default 'errmsg'.
+ Left err -> return $ ImportFailed err
+ Right m -> migrate_and_import m
+
+ | dtd `elem` SportInfo.dtds = do
+ let either_m = SportInfo.parse_xml dtd xml
+ case either_m of
+ -- This might give us a slightly better error
+ -- message than the default 'errmsg'.
+ Left err -> return $ ImportFailed err
+ Right m -> migrate_and_import m
+
+ | otherwise = do
+ let infomsg =
+ "Unrecognized DTD in " ++ path ++ ": " ++ dtd ++ "."
+ return $ ImportUnsupported infomsg
+
+
+
+-- | Entry point of the program. It twiddles some knobs for
+-- configuration options and then calls 'import_file' on each XML
+-- file given on the command-line.
+--
+-- Any file successfully processed is then optionally removed, and
+-- we're done.
+--