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{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE RecordWildCards #-}
-- | Default formatting for Graylog messages,
-- see http://docs.graylog.org/en/latest/pages/gelf.html
module Graylog.Gelf where
import Data.Aeson (ToJSON (..), Value (..), object, toJSON,
(.=))
import Data.HashMap.Strict (HashMap)
import Data.Scientific (Scientific)
import Data.Text (Text)
import Data.Time
import Data.Typeable
import GHC.Exts (toList)
import GHC.Generics
data GELF
= GELF
{ _gelfVersion :: Version
, _gelfHost :: Text
, _gelfShortMessage :: Text
, _gelfFullMessage :: Maybe Text
, _gelfTimestamp :: Maybe UTCTime
, _gelfLevel :: Maybe SyslogLevel
, _gelfLine :: Maybe Word
, _gelfFile :: Maybe Text
, _gelfMeta :: HashMap Text MetaValue
}
deriving (Show, Typeable, Generic)
data MetaValue
= TextValue Text
| NumberValue Scientific
deriving (Show)
instance ToJSON MetaValue where
toJSON (TextValue txt) = toJSON txt
toJSON (NumberValue n) = toJSON n
class ToMeta a where
toMeta :: a -> MetaValue
instance ToMeta Text where
toMeta = TextValue
instance ToMeta Scientific where
toMeta = NumberValue
instance ToMeta Integer where
toMeta = NumberValue . fromInteger
instance ToMeta Int where
toMeta = toMeta . toInteger
instance ToJSON GELF where
toJSON GELF{..} = object $ [ "version" .= _gelfVersion
, "host" .= _gelfHost
, "short_message" .= _gelfShortMessage
, "full_message" .= _gelfFullMessage
, "timestamp" .= _gelfTimestamp
, "level" .= _gelfLevel
, "line" .= _gelfLine
, "file" .= _gelfFile
] <> toList (toJSON <$> _gelfMeta)
--
data Version
= Version1x1
deriving (Eq, Show, Typeable, Generic)
instance ToJSON Version where
toJSON Version1x1 = String "1.1"
--
data SyslogLevel
= Emergency
| Alert
| Critical
| Error
| Warning
| Notice
| Informational
| Debug
deriving (Eq, Ord, Show, Typeable, Generic)
instance ToJSON SyslogLevel where
toJSON Emergency = Number 0
toJSON Alert = Number 1
toJSON Critical = Number 2
toJSON Error = Number 3
toJSON Warning = Number 4
toJSON Notice = Number 5
toJSON Informational = Number 6
toJSON Debug = Number 7
--
simpleGelf
:: Text -- ^ Hostname
-> Text -- ^ Short message
-> GELF
simpleGelf host short =
GELF Version1x1 host short Nothing Nothing Nothing Nothing Nothing mempty
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