import ExitCodes (
exit_no_feed_hosts,
exit_no_password,
- exit_no_username )
+ exit_no_username,
+ exit_pidfile_exists )
import Logging (
init_logging,
log_debug,
display_warning )
import TSN.FeedHosts ( FeedHosts(..) )
import TSN.Xml ( parse_xmlfid )
+import Unix ( full_daemonize )
-
--- | Warning! This does not automatically append a newline. The output
--- is displayed/logged as-is, for, you know, debug purposes.
+-- | Display and log debug information. WARNING! This does not
+-- automatically append a newline. The output is displayed/logged
+-- as-is, for, you know, debug purposes.
report_debug :: String -> IO ()
report_debug s = do
display_debug s
log_debug s
+
+-- | Display and log an error condition. This will prefix the error
+-- with "ERROR: " when displaying (but not logging) it so that it
+-- stands out.
+--
report_error :: String -> IO ()
report_error s = do
display_error $ "ERROR: " ++ s
log_error s
+
+-- | Display and log an informational (status) message.
report_info :: String -> IO ()
report_info s = do
display_info s
log_info s
--- | Warning! This does not automatically append a newline.
-report_sent :: String -> IO ()
-report_sent s = do
- display_sent s
- log_debug s
+-- | Display and log a warning. This will prefix the warning with
+-- "WARNING: " when displaying (but not logging) it so that it
+-- stands out.
+--
report_warning :: String -> IO ()
report_warning s = do
display_warning $ "WARNING: " ++ s
--
save_document :: Configuration -> String -> IO ()
save_document cfg doc =
- case maybe_path of
- Nothing ->
- report_error "Document missing XML_File_ID element."
- Just path -> do
+ case either_path of
+ Left err -> report_error err
+ Right path -> do
already_exists <- doesFileExist path
when already_exists $ do
let msg = "File " ++ path ++ " already exists, overwriting."
writeFile path doc
report_info $ "Wrote file: " ++ path ++ "."
where
+ -- All the fmaps are because we're working inside a Maybe.
xmlfid = fmap show (parse_xmlfid doc)
filename = fmap (++ ".xml") xmlfid
- maybe_path = fmap ((output_directory cfg) </>) filename
+ either_path = fmap ((output_directory cfg) </>) filename
-- | Loop forever, writing the buffer to file whenever a </message>
send_line h' s = do
let line = s ++ "\r\n"
hPutStr h' line
+ -- Don't log the username/password!
display_sent line
recv_chars :: Int -> Handle -> IO String
connect_and_loop :: Configuration -> String -> IO ()
connect_and_loop cfg host = do
- report_info $ "Connecting to " ++ host ++ "..."
+ report_info $ "Connecting to " ++ host ++ "."
bracket acquire_handle release_handle action
return ()
where
report_error "No username supplied."
exitWith (ExitFailure exit_no_username)
+ when (daemonize cfg) $ do
+ pidfile_exists <- doesFileExist (pidfile cfg)
+ when pidfile_exists $ do
+ report_error $ "PID file " ++ (pidfile cfg) ++ " already exists. "
+ ++ "Refusing to start."
+ exitWith (ExitFailure exit_pidfile_exists)
+
-- This may be superstition (and I believe stderr is unbuffered),
-- but it can't hurt.
hSetBuffering stderr NoBuffering
hSetBuffering stdout NoBuffering
- -- Begin connecting to our feed hosts, starting with the first one.
- round_robin cfg 0
+ -- The rest of the program is kicked off by the following line which
+ -- begins connecting to our feed hosts, starting with the first one,
+ -- and proceeds in a round-robin fashion.
+ let run_program = round_robin cfg 0
+
+ -- If we were asked to daemonize, do that; otherwise just run the thing.
+ if (daemonize cfg)
+ then full_daemonize cfg run_program
+ else run_program
where
-- | This is the top-level "loop forever" function. If an