From: Michael Orlitzky Date: Sat, 21 Dec 2013 18:12:16 +0000 (-0500) Subject: Add scaffolding to allow logging via syslog or a file. X-Git-Tag: 0.0.2~31 X-Git-Url: https://gitweb.michael.orlitzky.com/?a=commitdiff_plain;h=52e788e676ea2a67ad20b23d2e5c5b351f27b834;p=dead%2Fhtsn.git Add scaffolding to allow logging via syslog or a file. Rework the output/logging so that the stdout/stderr display does not pass through hslogger. Change the output colors. Update the example config with new options. --- diff --git a/doc/htsnrc.example b/doc/htsnrc.example index 07c1a23..0c26557 100644 --- a/doc/htsnrc.example +++ b/doc/htsnrc.example @@ -2,18 +2,21 @@ # would need to place it in $HOME/.htsnrc. On Windows, it probably # needs to go in %APPDATA%, or C:\Users\\Application Data. + # The username used to connect to the feed. # # Default: none (required) # # username = "whoever" + # The password used to connect to the feed. # # Default: none (required) # # password = "whatever" + # By default, htsn will output the XML files to the current working # directory. Often this is not desirable, and you would rather save # them to a specific location. Specify it here. @@ -22,6 +25,7 @@ # # output-directory = "/var/lib/htsn" + # A list of hostnames that supply the feed. # # Default: ["feed1.sportsnetwork.com", @@ -29,3 +33,31 @@ # "feed3.sportsnetwork.com"] # # feed-hosts = [ "hostname1", "hostname2", ... ] + + +# Do you want to log to syslog? If so, the log_file option below will +# be ignored. This will log to the event log on Windows. +# +# Default: True +# +# syslog = False + + +# If syslog = False, which file should we use for a log? Can be either +# a relative or absolute path. It will not be auto-rotated; use +# something log logrotate for that. +# +# Default: htsn.log +# +# log_file = /var/log/htsn/htsn.log + + +# How verbose should the logs be? Valid levels are, +# +# "INFO", "WARNING", "ERROR" +# +# (there are others, but we don't emit them.) +# +# Default: "INFO" +# +# log_level = "WARNING" diff --git a/src/CommandLine.hs b/src/CommandLine.hs index 0a5a5a5..6d894b9 100644 --- a/src/CommandLine.hs +++ b/src/CommandLine.hs @@ -13,6 +13,7 @@ import System.Console.CmdArgs ( program, summary, typ, + typFile, typDir ) -- This let's us get the version from Cabal. @@ -35,6 +36,15 @@ my_summary :: String my_summary = program_name ++ "-" ++ (showVersion version) +-- | A description of the "log_file" option. +log_file_help :: String +log_file_help = + "If syslog == False, log to the given file." + +log_level_help :: String +log_level_help = + "How verbose should the logs be? One of INFO, WARNING, ERROR." + -- | A description of the "password" option. password_help :: String password_help = @@ -45,6 +55,11 @@ output_directory_help :: String output_directory_help = "Directory in which to output the XML files; must be writable" +-- | A description of the "syslog" option. +syslog_help :: String +syslog_help = + "Enable (default) or disable logging to syslog." + -- | A description of the "username" option. username_help :: String username_help = @@ -56,8 +71,11 @@ username_help = arg_spec :: OptionalConfiguration arg_spec = OptionalConfiguration { + log_file = def &= typFile &= help log_file_help, + log_level = def &= typ "LEVEL" &= help log_level_help, password = def &= typ "PASSWORD" &= help password_help, output_directory = def &= typDir &= help output_directory_help, + syslog = def &= typ "BOOL" &= help syslog_help, username = def &= typ "USERNAME" &= help username_help, feed_hosts = def &= typ "HOSTNAMES" } &= program program_name diff --git a/src/Configuration.hs b/src/Configuration.hs index 7b237c5..6234821 100644 --- a/src/Configuration.hs +++ b/src/Configuration.hs @@ -7,7 +7,8 @@ module Configuration ( merge_optional ) where -import System.Console.CmdArgs.Default (Default(..)) +import System.Console.CmdArgs.Default ( Default(..) ) +import System.Log ( Priority( INFO ) ) import qualified OptionalConfiguration as OC (OptionalConfiguration(..)) import TSN.FeedHosts (FeedHosts(..)) @@ -15,15 +16,18 @@ import TSN.FeedHosts (FeedHosts(..)) data Configuration = Configuration { feed_hosts :: FeedHosts, + log_file :: FilePath, + log_level :: Priority, password :: String, output_directory :: FilePath, + syslog :: Bool, username :: String } deriving (Show) -- | A Configuration with all of its fields set to their default -- values. instance Default Configuration where - def = Configuration def def "." def + def = Configuration def "htsn.log" INFO def "." True def -- | Merge a Configuration with an OptionalConfiguration. This is more @@ -35,8 +39,11 @@ merge_optional :: Configuration merge_optional cfg opt_cfg = Configuration all_feed_hosts + (merge (log_file cfg) (OC.log_file opt_cfg)) + (merge (log_level cfg) (OC.log_level opt_cfg)) (merge (password cfg) (OC.password opt_cfg)) (merge (output_directory cfg) (OC.output_directory opt_cfg)) + (merge (syslog cfg) (OC.syslog opt_cfg)) (merge (username cfg) (OC.username opt_cfg)) where merge :: a -> Maybe a -> a diff --git a/src/Logging.hs b/src/Logging.hs index d8f9ed4..db7260a 100644 --- a/src/Logging.hs +++ b/src/Logging.hs @@ -6,11 +6,9 @@ module Logging ( log_warning ) where -import System.IO ( hPutStr, stderr, stdout ) -import System.Log ( LogRecord ) -import System.Log.Formatter ( LogFormatter ) +import System.Log.Handler.Simple ( GenericHandler ) import System.Log.Logger ( - Priority ( DEBUG, ERROR, INFO, WARNING ), + Priority ( DEBUG, INFO ), debugM, errorM, infoM, @@ -19,11 +17,6 @@ import System.Log.Logger ( setLevel, updateGlobalLogger, warningM ) -import System.Log.Handler.Simple ( - GenericHandler(..), - streamHandler ) - -import Terminal ( hPutBlueStr, hPutRedStr ) log_debug :: String -> IO () log_debug = debugM rootLoggerName @@ -37,49 +30,12 @@ log_info = infoM rootLoggerName log_warning :: String -> IO () log_warning = warningM rootLoggerName --- | Debug messages output to the console don't get a prefix, since --- they're used to dump the network chatter. -console_formatter :: LogRecord -> IO String -console_formatter (DEBUG, msg) = return $ msg ++ "\n" -console_formatter (prio, msg) = return $ (show prio) ++ ": " ++ msg ++ "\n" - - -warn_formatter :: LogFormatter a -warn_formatter _ x@(WARNING, _) _ = console_formatter x -warn_formatter _ x@(ERROR, _) _ = console_formatter x -warn_formatter _ _ _ = return "" - -info_formatter :: LogFormatter a -info_formatter _ x@(INFO, _) _ = console_formatter x -info_formatter _ _ _ = return "" - -debug_formatter :: LogFormatter a -debug_formatter _ x@(DEBUG, _) _ = console_formatter x -debug_formatter _ _ _ = return "" - - -init_logging :: IO () -init_logging = do - -- Set the root logger to DEBUG level so that it will *attempt* to - -- process every message. - updateGlobalLogger rootLoggerName (setLevel DEBUG) - - stdout_handler <- streamHandler stdout DEBUG - stderr_handler <- streamHandler stderr WARNING - - let debug_handler = stdout_handler { formatter = debug_formatter, - writeFunc = hPutStr } - - let info_handler = stdout_handler { formatter = info_formatter, - priority = INFO, - writeFunc = hPutBlueStr } - - -- This also catches ERRORs. - let warn_handler = stderr_handler { formatter = warn_formatter, - priority = WARNING, - writeFunc = hPutRedStr } - - -- Set debug, info, and warn handlers for the root log. - updateGlobalLogger - rootLoggerName - (setHandlers [debug_handler, info_handler, warn_handler]) +init_logging :: Bool -> IO () +init_logging use_syslog = do + let max_level = if use_syslog then INFO else DEBUG + -- We need to specify the type here; otherwise, setHandlers won't + -- accept the empty list as an instance of [LogHandler a]. + let no_handlers = [] :: [GenericHandler a] + -- Removes the default "echo to stdout" handler. + updateGlobalLogger rootLoggerName (setLevel max_level + . setHandlers no_handlers) diff --git a/src/Main.hs b/src/Main.hs index 12cd002..6b18c86 100644 --- a/src/Main.hs +++ b/src/Main.hs @@ -28,7 +28,6 @@ import System.IO ( stderr, stdout ) import System.IO.Error (catchIOError) -import System.Log.Logger ( getLogger, rootLoggerName, saveGlobalLogger ) import System.Timeout (timeout) import CommandLine (get_args) @@ -46,18 +45,52 @@ import Logging ( import qualified OptionalConfiguration as OC ( OptionalConfiguration(..), from_rc ) -import Terminal (putGreenLn) +import Terminal ( + display_debug, + display_error, + display_info, + display_sent, + display_warning ) import TSN.FeedHosts (FeedHosts(..)) import TSN.Xml (parse_xmlfid, xml_prologue) +-- | 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 + +report_error :: String -> IO () +report_error s = do + display_error $ "ERROR: " ++ s + log_error s + +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 + +report_warning :: String -> IO () +report_warning s = do + display_warning $ "WARNING: " ++ s + log_warning s + + -- | Receive a single line of text from a Handle, and send it to the -- debug log. -- recv_line :: Handle -> IO String recv_line h = do line <- hGetLine h - log_debug line + report_debug (line ++ "\n") return line @@ -72,14 +105,14 @@ save_document :: Configuration -> String -> IO () save_document cfg doc = case maybe_path of Nothing -> - log_error "Document missing XML_File_ID element." + report_error "Document missing XML_File_ID element." Just path -> do already_exists <- doesFileExist path when already_exists $ do let msg = "File " ++ path ++ " already exists, overwriting." - log_warning msg + report_warning msg writeFile path doc - log_info $ "Wrote file: " ++ path ++ "." + report_info $ "Wrote file: " ++ path ++ "." where xmlfid = fmap show (parse_xmlfid doc) filename = fmap (++ ".xml") xmlfid @@ -102,9 +135,9 @@ loop !cfg !h !buffer = do -- of its lines into one big string. let document = concat $ reverse buffer save_document cfg document - loop cfg h [line] -- empty the buffer before looping again + loop cfg h [line] -- Empty the buffer before looping again. else - -- append line to the head of the buffer and loop + -- Append line to the head of the buffer and loop. loop cfg h (line : buffer) @@ -113,13 +146,13 @@ log_in cfg h = do prompt1 <- recv_prompt h if prompt1 /= username_prompt then - log_error "Didn't receive username prompt." + report_error "Didn't receive username prompt." else do send_line h (username cfg) prompt2 <- recv_prompt h if prompt2 /= password_prompt then - log_error "Didn't receive password prompt." + report_error "Didn't receive password prompt." else do send_line h (password cfg) _ <- recv_line h -- "The Sports Network" @@ -130,21 +163,23 @@ log_in cfg h = do send_line :: Handle -> String -> IO () send_line h' s = do - hPutStr h' (s ++ "\r\n") - putGreenLn s + let line = s ++ "\r\n" + hPutStr h' line + display_sent line recv_chars :: Int -> Handle -> IO String recv_chars n h' = do s <- sequence [ hGetChar h' | _ <- [1..n] ] - putStr s + report_debug s return s recv_prompt :: Handle -> IO String recv_prompt = recv_chars 10 + connect_and_loop :: Configuration -> String -> IO () connect_and_loop cfg host = do - log_info $ "Connecting to " ++ host ++ "..." + report_info $ "Connecting to " ++ host ++ "..." bracket acquire_handle release_handle action return () where @@ -168,7 +203,7 @@ connect_and_loop cfg host = do -- login_worked <- timeout five_seconds $ log_in cfg h case login_worked of - Nothing -> log_info "Login timed out (5s)." + Nothing -> report_info "Login timed out (5s)." Just _ -> loop cfg h [] @@ -184,10 +219,6 @@ thread_sleep seconds = do -- | The entry point of the program. main :: IO () main = do - init_logging - root_logger <- getLogger rootLoggerName - saveGlobalLogger root_logger - rc_cfg <- OC.from_rc cmd_cfg <- get_args @@ -195,26 +226,30 @@ main = do -- prefering the command-line ones. let opt_config = rc_cfg <> cmd_cfg - -- This is necessary because if the user specifies an empty list of + -- 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 (syslog cfg) + + -- Check the optional config for missing required options. This is + -- necessary because if the user specifies an empty list of -- hostnames in e.g. the config file, we want to bail rather than - -- fall back on the default list (which gets merged from a - -- Configuration below). + -- fall back on the default list (which was merged from a default + -- Configuration above). when (null $ get_feed_hosts (OC.feed_hosts opt_config)) $ do - log_error "No feed hosts supplied." + report_error "No feed hosts supplied." exitWith (ExitFailure exit_no_feed_hosts) when (isNothing (OC.password opt_config)) $ do - log_error "No password supplied." + report_error "No password supplied." exitWith (ExitFailure exit_no_password) when (isNothing (OC.username opt_config)) $ do - log_error "No username supplied." + report_error "No username supplied." exitWith (ExitFailure exit_no_username) - -- Finally, update a default config with any options that have been - -- set in either the config file or on the command-line. - let cfg = (def :: Configuration) `merge_optional` opt_config - -- This may be superstition (and I believe stderr is unbuffered), -- but it can't hurt. hSetBuffering stderr NoBuffering @@ -234,6 +269,6 @@ main = do round_robin cfg feed_host_idx = do let hosts = get_feed_hosts $ feed_hosts cfg let host = hosts !! feed_host_idx - catchIOError (connect_and_loop cfg host) (log_error . show) + catchIOError (connect_and_loop cfg host) (report_error . show) thread_sleep 10 -- Wait 10s before attempting to reconnect. round_robin cfg $ (feed_host_idx + 1) `mod` (length hosts) diff --git a/src/OptionalConfiguration.hs b/src/OptionalConfiguration.hs index de2e97d..d133432 100644 --- a/src/OptionalConfiguration.hs +++ b/src/OptionalConfiguration.hs @@ -1,6 +1,7 @@ {-# LANGUAGE DeriveDataTypeable #-} {-# LANGUAGE FlexibleInstances #-} {-# LANGUAGE OverloadedStrings #-} +{-# LANGUAGE StandaloneDeriving #-} -- | An OptionalConfiguration is just like a 'Configuration', except -- all of its fields are optional. The user can set options in two @@ -18,17 +19,27 @@ import qualified Data.Configurator as DC ( Worth(Optional), load, lookup ) -import Data.Data (Data) -import Data.Maybe (fromMaybe) -import Data.Monoid (Monoid(..)) -import Data.Typeable (Typeable) -import System.Directory (getHomeDirectory) +import qualified Data.Configurator.Types as DCT ( + Configured, + Value( String ), + convert ) +import Data.Data ( Data ) +import Data.Maybe ( fromMaybe ) +import Data.Monoid ( Monoid(..) ) +import Data.Typeable ( Typeable ) +import System.Directory ( getHomeDirectory ) import System.FilePath ( () ) -import System.IO.Error (catchIOError) +import System.IO.Error ( catchIOError ) +import System.Log ( Priority(..) ) +import Logging ( log_error ) +import TSN.FeedHosts ( FeedHosts(..) ) -import Logging (log_error) -import TSN.FeedHosts (FeedHosts(..)) +-- Derive standalone instances of Data and Typeable for Priority. This +-- is necessary for OptionalConfiguration (which contains a Maybe +-- Priority) to derive Data and Typeable. +deriving instance Data Priority +deriving instance Typeable Priority -- | The same as Configuration, except everything is optional. It's easy to -- merge two of these by simply dropping the Nothings in favor of @@ -37,10 +48,13 @@ import TSN.FeedHosts (FeedHosts(..)) -- data OptionalConfiguration = OptionalConfiguration { - feed_hosts :: FeedHosts, - password :: Maybe String, + feed_hosts :: FeedHosts, + log_file :: Maybe FilePath, + log_level :: Maybe Priority, + password :: Maybe String, output_directory :: Maybe FilePath, - username :: Maybe String } + syslog :: Maybe Bool, + username :: Maybe String } deriving (Show, Data, Typeable) @@ -62,14 +76,20 @@ instance Monoid OptionalConfiguration where Nothing Nothing Nothing + Nothing + Nothing + Nothing -- | Combine @cfg1@ and @cfg2@, giving precedence to @cfg2@. cfg1 `mappend` cfg2 = OptionalConfiguration all_feed_hosts + (merge (log_file cfg1) (log_file cfg2)) + (merge (log_level cfg1) (log_level cfg2)) (merge (password cfg1) (password cfg2)) (merge (output_directory cfg1) (output_directory cfg2)) + (merge (syslog cfg1) (syslog cfg2)) (merge (username cfg1) (username cfg2)) where merge :: (Maybe a) -> (Maybe a) -> (Maybe a) @@ -85,6 +105,17 @@ instance Monoid OptionalConfiguration where else cfg2 +instance DCT.Configured Priority where + -- | This allows us to read a Priority level out of a Configurator + -- config file. By default Configurator wouldn't know what to do, + -- so we have to tell it that we expect one of the valid Priority + -- constructors. + convert (DCT.String "INFO") = Just INFO + convert (DCT.String "WARNING") = Just WARNING + convert (DCT.String "ERROR") = Just ERROR + convert _ = Nothing + + -- | Obtain an OptionalConfiguration from the file ".htsnrc" in the -- user's home directory. -- @@ -105,14 +136,20 @@ from_rc = do return "$(HOME)") let user_config_path = home ".htsnrc" cfg <- DC.load [ DC.Optional user_config_path ] + cfg_log_file <- DC.lookup cfg "log_file" + cfg_log_level <- DC.lookup cfg "log_level" cfg_password <- DC.lookup cfg "password" cfg_output_directory <- DC.lookup cfg "output_directory" + cfg_syslog <- DC.lookup cfg "syslog" cfg_username <- DC.lookup cfg "username" cfg_feed_hosts <- DC.lookup cfg "feed_hosts" return $ OptionalConfiguration (fromMaybe (FeedHosts []) cfg_feed_hosts) + cfg_log_file + cfg_log_level cfg_password cfg_output_directory + cfg_syslog cfg_username diff --git a/src/TSN/FeedHosts.hs b/src/TSN/FeedHosts.hs index 58831e5..d2f295b 100644 --- a/src/TSN/FeedHosts.hs +++ b/src/TSN/FeedHosts.hs @@ -13,7 +13,10 @@ where -- DC is needed only for the DCT.Configured instance of String. import qualified Data.Configurator as DC() -import qualified Data.Configurator.Types as DCT +import qualified Data.Configurator.Types as DCT ( + Configured, + Value( List ), + convert ) import Data.Data (Data) import System.Console.CmdArgs.Default (Default(..)) import Data.Typeable (Typeable) diff --git a/src/Terminal.hs b/src/Terminal.hs index 7e88505..6031d62 100644 --- a/src/Terminal.hs +++ b/src/Terminal.hs @@ -1,7 +1,9 @@ module Terminal ( - hPutBlueStr, - hPutRedStr, - putGreenLn ) + display_debug, + display_error, + display_info, + display_sent, + display_warning ) where import Control.Monad.IO.Class (MonadIO(..)) @@ -10,38 +12,45 @@ import System.Console.ANSI ( Color(..), ColorIntensity( Vivid ), ConsoleLayer( Foreground ), - setSGR ) -import System.IO ( Handle, hPutStr ) + hSetSGR ) +import System.IO ( Handle, hPutStr, stderr, stdout ) -- | Perform a computation (anything in MonadIO) with the given -- graphics mode(s) enabled. Revert to the previous graphics mode -- after the computation has finished. -with_sgr :: (MonadIO m) => [SGR] -> m a -> m a -with_sgr sgrs computation = do - liftIO $ setSGR sgrs +with_sgr :: (MonadIO m) => Handle -> [SGR] -> m a -> m a +with_sgr h sgrs computation = do + liftIO $ hSetSGR h sgrs x <- computation - liftIO $ setSGR [] + liftIO $ hSetSGR h [] return x --- | Perform a computation (anything in MonadIO) with the terminal --- output set to a certain color. Reset to the default color after --- the computation has finished. -with_color :: (MonadIO m) => Color -> m a -> m a -with_color color = - with_sgr [SetColor Foreground Vivid color] +-- | Perform a computation (anything in MonadIO) with the output set +-- to a certain color. Reset to the default color after the +-- computation has finished. +with_color :: (MonadIO m) => Handle -> Color -> m a -> m a +with_color h color = + with_sgr h [SetColor Foreground Vivid color] --- | Output the given line to the given handle, in red. The silly --- camelCase name is for consistency with e.g. hPutStrLn. -hPutRedStr :: Handle -> String -> IO () -hPutRedStr h = with_color Red . hPutStr h +hPutStrColor :: Handle -> Color -> String -> IO () +hPutStrColor h c = with_color h c . hPutStr h --- | Output the given line to the given handle, in blue. The silly --- camelCase name is for consistency with e.g. hPutStrLn. -hPutBlueStr :: Handle -> String -> IO () -hPutBlueStr h = with_color Blue . hPutStr h +hPutStrColorLn :: Handle -> Color -> String -> IO () +hPutStrColorLn h c s = hPutStrColor h c (s ++ "\n") --- | Output the given line to stdout, in green. The silly camelCase --- name is for consistency with e.g. putStrLn. -putGreenLn :: String -> IO () -putGreenLn = with_color Green . putStrLn +-- | Don't automatically append a newline. +display_sent :: String -> IO () +display_sent = hPutStrColor stdout Green + +display_debug :: String -> IO () +display_debug = putStr + +display_info :: String -> IO () +display_info = hPutStrColorLn stdout Cyan + +display_warning :: String -> IO () +display_warning = hPutStrColorLn stderr Yellow + +display_error :: String -> IO () +display_error = hPutStrColorLn stderr Red