hnormalise-0.4.1.0: app/Main.hs
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE RecordWildCards #-}
module Main where
--------------------------------------------------------------------------------
import Control.Applicative ((<$>), (<*>))
import Control.Concurrent.MVar (modifyMVar_, newMVar, newEmptyMVar, putMVar, readMVar, tryTakeMVar, withMVar, MVar)
import Control.Monad
import Control.Monad.IO.Class (MonadIO, liftIO)
import Control.Monad.Loops (whileM_, untilM_)
import Control.Monad.Trans (lift)
import Control.Monad.Trans.Resource (runResourceT)
import Data.Aeson
import Data.Attoparsec.Text
import qualified Data.ByteString.Char8 as SBS
import qualified Data.ByteString.Lazy.Char8 as BS
import Data.Conduit
import Data.Conduit.Binary (sinkFile)
import qualified Data.Conduit.Binary as CB
import qualified Data.Conduit.Combinators as C
import Data.Conduit.Network
import qualified Data.Conduit.Text as DCT
import qualified Data.Conduit.ZMQ4 as ZMQC
import Data.Maybe (fromJust)
import Data.Monoid ((<>))
import qualified Data.Text as T
import qualified Data.Text.Encoding as TE
import Data.Version (showVersion)
import qualified Options.Applicative as OA
import qualified Paths_hnormalise
import System.Exit (exitFailure, exitSuccess)
import System.Posix.Signals (installHandler, Handler(CatchOnce), sigINT, sigTERM)
import qualified System.ZMQ4 as ZMQ (Receiver, Sender, Socket, Size, context, term, setIoThreads, Context)
import qualified System.ZMQ4 as ZMQ (withContext, withSocket, bind, send, receive, connect, Push(..), Pull(..))
import Text.Printf (printf)
import Debug.Trace
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import HNormalise
import HNormalise.Config ( Config (..)
, ConnectionType(..)
, InputConfig(..)
, OutputConfig(..)
, TcpOutputConfig(..)
, TcpPortConfig(..)
, ZeroMQOutputConfig(..)
, ZeroMQPortConfig(..)
, connectionType
, loadConfig)
import HNormalise.Internal (Rsyslog (..))
import HNormalise.Json
--------------------------------------------------------------------------------
data Options = Options
{ oConfigFilePath :: !(Maybe FilePath)
, oJsonInput :: !Bool
, oVersion :: !Bool
, oTestFilePath :: !(Maybe FilePath)
} deriving (Show)
--------------------------------------------------------------------------------
parserOptions :: OA.Parser Options
parserOptions = Options
<$> (OA.optional $ OA.strOption $
OA.long "configfile" <>
OA.short 'c' <>
OA.metavar "FILENAME" <>
OA.help "configuration file location ")
<*> (OA.switch $
OA.long "jsoninput" <>
OA.short 'j' <>
OA.help "Input will be delivered as JSON (slower)")
<*> (OA.switch $
OA.long "version" <>
OA.short 'v' <>
OA.help "Display version and exit" <>
OA.hidden)
<*> (OA.optional $ OA.strOption $
OA.long "test" <>
OA.short 't' <>
OA.metavar "OUTPUT FILENAME" <>
OA.help "run in test modus, sinking output to the given file")
--------------------------------------------------------------------------------
parserInfo :: OA.ParserInfo Options
parserInfo = OA.info (OA.helper <*> parserOptions)
(OA.fullDesc
<> OA.progDesc "Normalise rsyslog messages"
<> OA.header ("hNormalise v" <> showVersion Paths_hnormalise.version)
)
--------------------------------------------------------------------------------
-- | 'handler' will catch SIGTERM and modify the MVar to allow the upstream
-- connection to be closed cleanly when using ZeroMQ. Code taken from
-- http://zguide.zeromq.org/hs:interrupt
handler :: MVar () -> IO ()
handler s_interrupted = trace "Interrupt received" $ putMVar s_interrupted ()
--------------------------------------------------------------------------------
-- | 'messageSink' yields the parsed JSON downstream, or if parsing fails, yields the original message downstream
messageSink success failure = loop
where
loop = do
v <- await
case v of
Just (Transformed json) -> do
yield json $$ success
yield (SBS.pack "\n") $$ success
loop
Just (Original l) -> do
yield l $$ failure
yield (SBS.pack "\n") $$ failure
loop
Nothing -> return ()
--------------------------------------------------------------------------------
-- | 'mySink' yields the results downstream with the addition of a string mentioning success or failure
-- for testing purposes
mySink = loop
where
loop = do
v <- await
case v of
Just (Transformed json) -> do
trace "successfull parse" $ yield (SBS.pack "success: ")
yield json
yield (SBS.pack "\n")
loop
Just (Original l) -> do
trace "failed parse" $ yield (SBS.pack "fail - original: ")
yield l
yield (SBS.pack "\n")
loop
Nothing -> return ()
--------------------------------------------------------------------------------
runTCPConnection options config = do
let listenHost = fromJust $ input config >>= (\(InputConfig t _) -> t) >>= (\(TcpPortConfig h p) -> h)
let listenPort = fromJust $ input config >>= (\(InputConfig t _) -> t) >>= (\(TcpPortConfig h p) -> p)
runTCPServer (serverSettings listenPort "*") $ \appData -> do
let fs = fields config
case oTestFilePath options of
Nothing -> do
let successHost = TE.encodeUtf8 $ fromJust $ output config >>= (\(OutputConfig t _) -> t) >>= (\(TcpOutputConfig s f) -> s) >>= (\(TcpPortConfig h p) -> h)
let successPort = fromJust $ output config >>= (\(OutputConfig t _) -> t) >>= (\(TcpOutputConfig s f) -> s) >>= (\(TcpPortConfig h p) -> p)
let failureHost = TE.encodeUtf8 $ fromJust $ output config >>= (\(OutputConfig t _) -> t) >>= (\(TcpOutputConfig s f) -> f) >>= (\(TcpPortConfig h p) -> h)
let failurePort = fromJust $ output config >>= (\(OutputConfig t _) -> t) >>= (\(TcpOutputConfig s f) -> f) >>= (\(TcpPortConfig h p) -> p)
runTCPClient (clientSettings successPort successHost) $ \successServer ->
runTCPClient (clientSettings failurePort failureHost) $ \failServer ->
let normalisationConduit = case oJsonInput options of
True -> CB.lines $= C.map (normaliseJsonInput fs)
False -> DCT.decode DCT.utf8 $= DCT.lines $= C.map (normaliseText fs)
in appSource appData
$= normalisationConduit
$$ messageSink (appSink successServer) (appSink failServer)
Just testSinkFileName ->
let normalisationConduit = case oJsonInput options of
True -> CB.lines $= C.map (normaliseJsonInput fs)
False -> DCT.decode DCT.utf8 $= DCT.lines $= C.map (normaliseText fs)
in runResourceT $ appSource appData
$= normalisationConduit
$= mySink
$$ sinkFile testSinkFileName
-- | 'zmqInterruptibleSource' converts a regular 0mq recieve operation on a socket into a conduit source
-- The source is halted when something is put into the MVar, effectively stopping the program from checking
-- for new incoming messages.
zmqInterruptibleSource m s = do
whileM_
(liftIO $ do
val <- tryTakeMVar m
case val of
Just _ -> trace "interrupt received, stopping source" $ return False
Nothing -> trace "still going ..." $ return True)
(lift (ZMQ.receive s) >>= yield)
liftIO $ putStrLn "Done!"
--------------------------------------------------------------------------------
runZeroMQConnection options config s_interrupted = do
let fs = fields config
let listenHost = fromJust $ input config >>= (\(InputConfig _ z) -> z) >>= (\(ZeroMQPortConfig m h p) -> h)
let listenPort = fromJust $ input config >>= (\(InputConfig _ z) -> z) >>= (\(ZeroMQPortConfig m h p) -> p)
trace (printf "listening on tcp://%s:%d" listenHost listenPort) $ return ()
case oTestFilePath options of
Nothing -> do
ZMQ.withContext $ \ctx -> do
ZMQ.withSocket ctx ZMQ.Pull $ \s -> do
ZMQ.bind s $ printf "tcp://%s:%d" listenHost listenPort
let successHost = fromJust $ output config >>= (\(OutputConfig _ z) -> z) >>= (\(ZeroMQOutputConfig s f) -> s) >>= (\(ZeroMQPortConfig m h p) -> h)
let successPort = fromJust $ output config >>= (\(OutputConfig _ z) -> z) >>= (\(ZeroMQOutputConfig s f) -> s) >>= (\(ZeroMQPortConfig m h p) -> p)
let failureHost = fromJust $ output config >>= (\(OutputConfig _ z) -> z) >>= (\(ZeroMQOutputConfig s f) -> f) >>= (\(ZeroMQPortConfig m h p) -> h)
let failurePort = fromJust $ output config >>= (\(OutputConfig _ z) -> z) >>= (\(ZeroMQOutputConfig s f) -> f) >>= (\(ZeroMQPortConfig m h p) -> p)
ZMQ.withSocket ctx ZMQ.Push $ \successSocket ->
ZMQ.withSocket ctx ZMQ.Push $ \failureSocket -> do
ZMQ.connect successSocket $ printf "tcp://%s:%d" successHost successPort
trace (printf "connected to tcp://%s:%d" successHost successPort) $ return ()
ZMQ.connect failureSocket $ printf "tcp://%s:%d" failureHost failurePort
trace (printf "connected to tcp://%s:%d" failureHost failurePort) $ return ()
let normalisationConduit = case oJsonInput options of
True -> CB.lines $= C.map (normaliseJsonInput fs)
False -> DCT.decode DCT.utf8 $= DCT.lines $= C.map (normaliseText fs)
liftIO $ zmqInterruptibleSource s_interrupted s
$= normalisationConduit
$$ messageSink (ZMQC.zmqSink successSocket []) (ZMQC.zmqSink failureSocket [])
{-Just testSinkFileName ->
let normalisationConduit = case oJsonInput options of
True -> CB.lines $= C.map (normaliseJsonInput fs)
False -> DCT.decode DCT.utf8 $= DCT.lines $= C.map (normaliseText fs)
in ZMQ.withContext $ \ctx -> do
ZMQ.withSocket ctx ZMQ.Pull $ \s -> do
ZMQ.bind s $ printf "tcp://%s:%d" listenHost listenPort
liftIO $ zmqInterruptibleSource s_interrupted s
$= normalisationConduit
$= mySink
$$ sinkFile testSinkFileName
-}
--------------------------------------------------------------------------------
-- | 'main' starts a TCP server, listening to incoming data and connecting to TCP servers downstream to
-- for the pipeline.
main :: IO ()
main = do
options <- OA.execParser parserInfo
when (oVersion options) $ do
putStrLn $ showVersion Paths_hnormalise.version
exitSuccess
config <- loadConfig (oConfigFilePath options)
--trace (show config) $ return ()
-- install the signal handlers for a clean shutdown
-- For now, we only support input and output configurations of the same type,
-- i.e., both TCP, both ZeroMQ, etc.
case connectionType config of
TCP -> void $ runTCPConnection options config
ZeroMQ -> do
trace "zeromq" $ return ()
s_interrupted <- newEmptyMVar
installHandler sigINT (CatchOnce $ handler s_interrupted) Nothing
installHandler sigTERM (CatchOnce $ handler s_interrupted) Nothing
runZeroMQConnection options config s_interrupted
exitSuccess