+{-# LANGUAGE DoAndIfThenElse #-}
+{-# LANGUAGE NoMonomorphismRestriction #-}
module Main
where
-import Text.Show.Pretty ( ppShow )
-import Text.XML.HXT.Core
+-- System imports.
+import Control.Arrow ( (&&&), (>>^), arr, returnA )
+import Control.Concurrent ( threadDelay )
+import Control.Exception ( SomeException, catch )
+import Control.Monad ( when )
+import Database.Groundhog.Generic ( runDbConn )
+import Database.Groundhog.Sqlite (
+ withSqliteConn )
+import Database.Groundhog.Postgresql (
+ withPostgresqlConn )
+import Data.Monoid ( (<>) )
+import Network.Services.TSN.Logging ( init_logging )
+import System.Console.CmdArgs ( def )
+import System.Directory ( removeFile )
+import System.Exit ( exitWith, ExitCode (ExitFailure) )
+import System.IO.Error ( catchIOError )
+import Text.XML.HXT.Core (
+ ArrowXml,
+ IOStateArrow,
+ SysConfigList,
+ XmlTree,
+ (>>>),
+ (/>),
+ getAttrl,
+ getText,
+ hasName,
+ readDocument,
+ runX,
+ unpickleDoc )
-import qualified TSN.Injuries as Injuries
+-- 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.AutoRacingDriverList as AutoRacingDriverList (
+ dtd,
+ pickle_message )
+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, parse_opts_novalidate )
+-- | 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." Now that we're
+ -- validating against the DTDs, this will almost always be
+ -- caused by a document whose DTD is not present (i.e. is
+ -- unsupported). So we return "success" to allow the XML file to
+ -- be deleted.
+ report_info $ "No DTD for file " ++ path ++ "."
+ return True
+ (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'. We take a
+ -- SysConfigList so our caller can decide whether or not to
+ -- e.g. validate the document against its DTD.
+ readA :: SysConfigList -> IOStateArrow s a XmlTree
+ readA scl = readDocument scl 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.
+ --
+ -- Before we actually run the import, we check it against a list
+ -- of problem DTDs. These can produce weird errors, and we have
+ -- checks for them. But with DTD validation enabled, we can't
+ -- even look inside the document to see what's wrong -- parsing
+ -- will fail! So for those special document types, we proceed
+ -- using 'parse_opts_novalidate' instead of the default
+ -- 'parse_opts'.
+ --
+ parse_and_import :: IO [ImportResult]
+ parse_and_import = do
+ -- Get the DTD name without validating against it.
+ ((DtdName dtd) : _) <- runX $ (readA parse_opts_novalidate) >>> dtdnameA
+
+ let problem_dtds = [ News.dtd, Weather.dtd ]
+ let opts = if dtd `elem` problem_dtds
+ then parse_opts_novalidate
+ else parse_opts
+
+ runX ((readA opts) >>> (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 == AutoRacingDriverList.dtd =
+ go AutoRacingDriverList.pickle_message
+
+ | 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
+
+ | dtd == MLBEarlyLine.dtd = go MLBEarlyLine.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 (format_parse_error 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 (format_parse_error err)
+ Right m -> migrate_and_import m
+
+ | otherwise = do
+ let infomsg =
+ "Unrecognized DTD in " ++ path ++ ": " ++ dtd ++ "."
+ -- This should be an impossible case while DTD
+ -- validation is enabled. If we can parse the file at
+ -- all, then we have a DTD for it sitting around. And we
+ -- only have DTDs for supported types.
+ 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.
+--
main :: IO ()
main = do
- res <- runX ( xunpickleDocument Injuries.pickle_message
- [ withValidate no
- , withTrace 1
- , withRemoveWS yes
- , withPreserveComment no
- ] "test/xml/injuriesxml.xml" )
- putStr $ ppShow res
+ rc_cfg <- OC.from_rc
+ cmd_cfg <- get_args
+
+ -- Merge the config file options with the command-line ones,
+ -- prefering the command-line ones.
+ let opt_config = rc_cfg <> cmd_cfg
+
+ -- Update a default config with any options that have been set in
+ -- either the config file or on the command-line. We initialize
+ -- logging before the missing parameter checks below so that we can
+ -- log the errors.
+ let cfg = (def :: Configuration) `merge_optional` opt_config
+ init_logging (log_level cfg) (log_file cfg) (syslog cfg)
+
+ -- Check the optional config for missing required options.
+ when (null $ OC.xml_files opt_config) $ do
+ report_error "No XML files given."
+ exitWith (ExitFailure exit_no_xml_files)
+
+ -- We don't do this in parallel (for now?) to keep the error
+ -- messages nice and linear.
+ results <- mapM (import_file cfg) (OC.xml_files opt_config)
+
+ -- Zip the results with the files list to find out which ones can be
+ -- deleted.
+ let result_pairs = zip (OC.xml_files opt_config) results
+ let victims = [ p | (p, True) <- result_pairs ]
+ let processed_count = length victims
+ report_info $ "Processed " ++ (show processed_count) ++ " document(s) total."
+ when (remove cfg) $ mapM_ (kill True) victims
+
+ where
+ -- | Wrap these two actions into one function so that we don't
+ -- report that the file was removed if the exception handler is
+ -- run.
+ remove_and_report path = do
+ removeFile path
+ report_info $ "Removed processed file " ++ path ++ "."
+
+ -- | Try to remove @path@ and potentially try again.
+ kill try_again path =
+ (remove_and_report path) `catchIOError` exception_handler
+ where
+ -- | A wrapper around threadDelay which takes seconds instead of
+ -- microseconds as its argument.
+ thread_sleep :: Int -> IO ()
+ thread_sleep seconds = do
+ let microseconds = seconds * (10 ^ (6 :: Int))
+ threadDelay microseconds
+
+ -- | If we can't remove the file, report that, and try once
+ -- more after waiting a few seconds.
+ exception_handler :: IOError -> IO ()
+ exception_handler e = do
+ report_error (show e)
+ report_error $ "Failed to remove imported file " ++ path ++ "."
+ if try_again then do
+ report_info "Waiting 5 seconds to attempt removal again..."
+ thread_sleep 5
+ kill False path
+ else
+ report_info $ "Giving up on " ++ path ++ "."
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