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1 | {-# LANGUAGE DeriveDataTypeable #-} | |
2 | {-# LANGUAGE DeriveGeneric #-} | |
3 | {-# LANGUAGE OverloadedStrings #-} | |
4 | {-# LANGUAGE RecordWildCards #-} | |
5 | ||
6 | -- | Default formatting for Graylog messages, | |
7 | -- see http://docs.graylog.org/en/latest/pages/gelf.html | |
8 | module Graylog.Gelf where | |
9 | ||
10 | import Data.Aeson (ToJSON (..), Value (..), object, toJSON, | |
11 | (.=)) | |
12 | import Data.HashMap.Strict (HashMap) | |
13 | import Data.Scientific (Scientific) | |
14 | import Data.Text (Text) | |
15 | import Data.Time | |
16 | import Data.Typeable | |
17 | import GHC.Exts (toList) | |
18 | import GHC.Generics | |
19 | ||
20 | data GELF | |
21 | = GELF | |
22 | { _gelfVersion :: Version | |
23 | , _gelfHost :: Text | |
24 | , _gelfShortMessage :: Text | |
25 | , _gelfFullMessage :: Maybe Text | |
26 | , _gelfTimestamp :: Maybe UTCTime | |
27 | , _gelfLevel :: Maybe SyslogLevel | |
28 | , _gelfLine :: Maybe Word | |
29 | , _gelfFile :: Maybe Text | |
30 | , _gelfMeta :: HashMap Text MetaValue | |
31 | } | |
32 | deriving (Show, Typeable, Generic) | |
33 | ||
34 | data MetaValue | |
35 | = TextValue Text | |
36 | | NumberValue Scientific | |
37 | deriving (Show) | |
38 | ||
39 | instance ToJSON MetaValue where | |
40 | toJSON (TextValue txt) = toJSON txt | |
41 | toJSON (NumberValue n) = toJSON n | |
42 | ||
43 | class ToMeta a where | |
44 | toMeta :: a -> MetaValue | |
45 | ||
46 | instance ToMeta Text where | |
47 | toMeta = TextValue | |
48 | ||
49 | instance ToMeta Scientific where | |
50 | toMeta = NumberValue | |
51 | ||
52 | instance ToMeta Integer where | |
53 | toMeta = NumberValue . fromInteger | |
54 | ||
55 | instance ToMeta Int where | |
56 | toMeta = toMeta . toInteger | |
57 | ||
58 | instance ToJSON GELF where | |
59 | toJSON GELF{..} = object $ [ "version" .= _gelfVersion | |
60 | , "host" .= _gelfHost | |
61 | , "short_message" .= _gelfShortMessage | |
62 | , "full_message" .= _gelfFullMessage | |
63 | , "timestamp" .= _gelfTimestamp | |
64 | , "level" .= _gelfLevel | |
65 | , "line" .= _gelfLine | |
66 | , "file" .= _gelfFile | |
67 | ] <> toList (toJSON <$> _gelfMeta) | |
68 | ||
69 | -- | |
70 | ||
71 | data Version | |
72 | = Version1x1 | |
73 | deriving (Eq, Show, Typeable, Generic) | |
74 | ||
75 | instance ToJSON Version where | |
76 | toJSON Version1x1 = String "1.1" | |
77 | ||
78 | -- | |
79 | ||
80 | data SyslogLevel | |
81 | = Emergency | |
82 | | Alert | |
83 | | Critical | |
84 | | Error | |
85 | | Warning | |
86 | | Notice | |
87 | | Informational | |
88 | | Debug | |
89 | deriving (Eq, Ord, Show, Typeable, Generic) | |
90 | ||
91 | instance ToJSON SyslogLevel where | |
92 | toJSON Emergency = Number 0 | |
93 | toJSON Alert = Number 1 | |
94 | toJSON Critical = Number 2 | |
95 | toJSON Error = Number 3 | |
96 | toJSON Warning = Number 4 | |
97 | toJSON Notice = Number 5 | |
98 | toJSON Informational = Number 6 | |
99 | toJSON Debug = Number 7 | |
100 | ||
101 | -- | |
102 | ||
103 | simpleGelf | |
104 | :: Text -- ^ Hostname | |
105 | -> Text -- ^ Short message | |
106 | -> GELF | |
107 | simpleGelf host short = | |
108 | GELF Version1x1 host short Nothing Nothing Nothing Nothing Nothing mempty |