module Network.Wai.Middleware.RequestLogger
( logStdout
, logCallback
, logStdoutDev
, logCallbackDev
, logHandle
, logHandleDev
) where
import System.IO (stdout, hFlush)
import qualified Data.ByteString as BS
import Data.ByteString.Char8 (pack, unpack)
import Control.Monad.IO.Class (liftIO)
import Network.Wai (Request(..), Middleware, responseStatus, Response)
import System.Log.FastLogger
import Network.HTTP.Types as H
import Data.Maybe (fromMaybe)
import Network.Wai.Parse (sinkRequestBody, lbsBackEnd, fileName, Param, File, getRequestBodyType)
import qualified Data.ByteString.Lazy as LBS
import qualified Data.Conduit as C
import qualified Data.Conduit.List as CL
import System.Console.ANSI
import Data.IORef
import System.IO.Unsafe
logHandle :: (BS.ByteString -> IO ()) -> Middleware
logHandle = logCallback
logHandleDev :: (BS.ByteString -> IO ()) -> Middleware
logHandleDev = logCallbackDev
logStdout :: Middleware
logStdout = logCallback $ \bs -> hPutLogStr stdout [LB bs]
logStdoutDev :: Middleware
logStdoutDev = logCallbackDev $ \bs -> hPutLogStr stdout [LB bs] >> hFlush stdout
logCallback :: (BS.ByteString -> IO ())
-> Middleware
logCallback cb app req = do
rsp <- app req
liftIO $ cb $ BS.concat
[ requestMethod req
, " "
, rawPathInfo req
, rawQueryString req
, " "
, "Accept: "
, maybe "" toBS $ lookup "Accept" $ requestHeaders req
, "\n"
, "Status: "
, statusBS rsp
, " "
, msgBS rsp
]
return rsp
toBS :: H.Ascii -> BS.ByteString
toBS = id
colors :: IORef [Color]
colors = unsafePerformIO $ newIORef [
Red
, Green
, Yellow
, Blue
, Magenta
, Cyan
]
rotateColors :: [Color] -> ([Color], Color)
rotateColors [] = error "Impossible! There must be colors!"
rotateColors (c:cs) = (cs ++ [c], c)
logCallbackDev :: (BS.ByteString -> IO ())
-> Middleware
logCallbackDev cb app req = do
let mlen = lookup "content-length" (requestHeaders req) >>= readInt
(req', body) <-
case mlen of
Just len | len <= 2048 -> do
body <- requestBody req C.$$ CL.consume
let req' = req { requestBody = CL.sourceList body }
return (req', body)
_ -> return (req, [])
postParams <- if requestMethod req `elem` ["GET", "HEAD"]
then return []
else do postParams <- liftIO $ allPostParams body
return $ collectPostParams postParams
let getParams = map emptyGetParam $ queryString req
color <- liftIO $ atomicModifyIORef colors rotateColors
liftIO $ cb $ BS.concat $ ansiColor color (requestMethod req) ++
[ " "
, rawPathInfo req
, "\n"
, "Accept: "
, fromMaybe "" $ lookup "Accept" $ requestHeaders req
, paramsToBS "GET " getParams
, paramsToBS "POST " postParams
, "\n"
]
rsp <- app req'
liftIO $ cb $ BS.concat $ ansiColor color "Status: " ++ [
statusBS rsp
, " "
, msgBS rsp
, ". "
, rawPathInfo req
, "\n"
]
return rsp
where
ansiColor color bs = [
pack $ setSGRCode [SetColor Foreground Vivid color]
, bs
, pack $ setSGRCode [Reset]
]
paramsToBS prefix params =
if null params then ""
else BS.concat ["\n", prefix, pack (show params)]
allPostParams body =
case getRequestBodyType req of
Nothing -> return ([], [])
Just rbt -> C.runResourceT $ CL.sourceList body C.$$ sinkRequestBody lbsBackEnd rbt
emptyGetParam :: (BS.ByteString, Maybe BS.ByteString) -> (BS.ByteString, BS.ByteString)
emptyGetParam (k, Just v) = (k,v)
emptyGetParam (k, Nothing) = (k,"")
collectPostParams :: ([Param], [File LBS.ByteString]) -> [Param]
collectPostParams (postParams, files) = postParams ++
map (\(k,v) -> (k, BS.append "FILE: " (fileName v))) files
readInt bs =
case reads $ unpack bs of
(i, _):_ -> Just (i :: Int)
[] -> Nothing
statusBS :: Response -> BS.ByteString
statusBS = pack . show . statusCode . responseStatus
msgBS :: Response -> BS.ByteString
msgBS = statusMessage . responseStatus