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1 | {-# LANGUAGE DeriveDataTypeable #-} |
2 | {-# LANGUAGE DeriveGeneric #-} | |
3 | {-# LANGUAGE OverloadedStrings #-} | |
4 | ||
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5 | -- | Default formatting for Graylog messages, |
6 | -- see http://docs.graylog.org/en/latest/pages/gelf.html | |
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7 | module Graylog.Gelf where |
8 | ||
9 | import Data.Aeson (ToJSON (..), Value (..), genericToJSON, | |
10 | toJSON) | |
11 | import Data.Aeson.Casing | |
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12 | import Data.Text (Text) |
13 | import Data.Time | |
14 | import Data.Typeable | |
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15 | import GHC.Generics |
16 | ||
17 | data GELF | |
18 | = GELF | |
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19 | { _gelfVersion :: Version |
20 | , _gelfHost :: Text | |
21 | , _gelfShortMessage :: Text | |
22 | , _gelfFullMessage :: Maybe Text | |
23 | , _gelfTimestamp :: Maybe UTCTime | |
24 | , _gelfLevel :: Maybe SyslogLevel | |
25 | , _gelfLine :: Maybe Word | |
26 | , _gelfFile :: Maybe Text | |
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27 | } |
28 | deriving (Show, Typeable, Generic) | |
29 | ||
30 | instance ToJSON GELF where | |
31 | toJSON = genericToJSON $ aesonPrefix snakeCase | |
32 | ||
33 | -- | |
34 | ||
35 | data Version | |
36 | = Version1x1 | |
37 | deriving (Eq, Show, Typeable, Generic) | |
38 | ||
39 | instance ToJSON Version where | |
40 | toJSON Version1x1 = String "1.1" | |
41 | ||
42 | -- | |
43 | ||
44 | data SyslogLevel | |
45 | = Emergency | |
46 | | Alert | |
47 | | Critical | |
48 | | Error | |
49 | | Warning | |
50 | | Notice | |
51 | | Informational | |
52 | | Debug | |
53 | deriving (Eq, Ord, Show, Typeable, Generic) | |
54 | ||
55 | instance ToJSON SyslogLevel where | |
56 | toJSON Emergency = Number 0 | |
57 | toJSON Alert = Number 1 | |
58 | toJSON Critical = Number 2 | |
59 | toJSON Error = Number 3 | |
60 | toJSON Warning = Number 4 | |
61 | toJSON Notice = Number 5 | |
62 | toJSON Informational = Number 6 | |
63 | toJSON Debug = Number 7 | |
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64 | |
65 | -- | |
66 | ||
67 | simpleGelf | |
68 | :: Text -- ^ Hostname | |
69 | -> Text -- ^ Short message | |
70 | -> GELF | |
71 | simpleGelf host short = | |
72 | GELF Version1x1 host short Nothing Nothing Nothing Nothing Nothing |