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{-# LANGUAGE OverloadedStrings #-}
module LogFormat
( logFormat
) where
import qualified Data.ByteString.Char8 as BS
import Data.Maybe (fromMaybe)
import Data.Monoid ((<>))
import Network.HTTP.Types (Status(statusCode))
import Network.Wai
(Request, httpVersion, rawPathInfo, requestHeaderReferer,
requestHeaderUserAgent, requestHeaders, requestMethod)
import System.Log.FastLogger (LogStr, toLogStr)
-- Sligthly modified Combined Log Format.
-- User ID extracted from the From header.
logFormat :: BS.ByteString -> Request -> Status -> Maybe Integer -> LogStr
logFormat t req st msize =
"" <> toLogStr (fromMaybe "-" $ lookup "X-Forwarded-For" headers) <> " - " <>
toLogStr (fromMaybe "-" $ lookup "From" headers) <>
" [" <>
toLogStr t <>
"] \"" <>
toLogStr (requestMethod req) <>
" " <>
toLogStr (rawPathInfo req) <>
" " <>
toLogStr (show $ httpVersion req) <>
"\" " <>
toLogStr (show $ statusCode st) <>
" " <>
toLogStr (maybe "-" show msize) <>
" \"" <>
toLogStr (fromMaybe "" $ requestHeaderReferer req) <>
"\" \"" <>
toLogStr (fromMaybe "" $ requestHeaderUserAgent req) <>
"\"\n"
where
headers = requestHeaders req
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