root / src / Ganeti / DataCollectors / Drbd.hs @ e71c47d3
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1 | 332b1340 | Michele Tartara | {-| DRBD data collector. |
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2 | 332b1340 | Michele Tartara | |
3 | 332b1340 | Michele Tartara | -} |
4 | 332b1340 | Michele Tartara | |
5 | 332b1340 | Michele Tartara | {- |
6 | 332b1340 | Michele Tartara | |
7 | 332b1340 | Michele Tartara | Copyright (C) 2012 Google Inc. |
8 | 332b1340 | Michele Tartara | |
9 | 332b1340 | Michele Tartara | This program is free software; you can redistribute it and/or modify |
10 | 332b1340 | Michele Tartara | it under the terms of the GNU General Public License as published by |
11 | 332b1340 | Michele Tartara | the Free Software Foundation; either version 2 of the License, or |
12 | 332b1340 | Michele Tartara | (at your option) any later version. |
13 | 332b1340 | Michele Tartara | |
14 | 332b1340 | Michele Tartara | This program is distributed in the hope that it will be useful, but |
15 | 332b1340 | Michele Tartara | WITHOUT ANY WARRANTY; without even the implied warranty of |
16 | 332b1340 | Michele Tartara | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
17 | 332b1340 | Michele Tartara | General Public License for more details. |
18 | 332b1340 | Michele Tartara | |
19 | 332b1340 | Michele Tartara | You should have received a copy of the GNU General Public License |
20 | 332b1340 | Michele Tartara | along with this program; if not, write to the Free Software |
21 | 332b1340 | Michele Tartara | Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
22 | 332b1340 | Michele Tartara | 02110-1301, USA. |
23 | 332b1340 | Michele Tartara | |
24 | 332b1340 | Michele Tartara | -} |
25 | 332b1340 | Michele Tartara | |
26 | 332b1340 | Michele Tartara | module Ganeti.DataCollectors.Drbd |
27 | 332b1340 | Michele Tartara | ( main |
28 | 332b1340 | Michele Tartara | , options |
29 | 332b1340 | Michele Tartara | , arguments |
30 | 332b1340 | Michele Tartara | ) where |
31 | 332b1340 | Michele Tartara | |
32 | 332b1340 | Michele Tartara | |
33 | 332b1340 | Michele Tartara | import qualified Control.Exception as E |
34 | d78970ba | Michele Tartara | import Control.Monad |
35 | 332b1340 | Michele Tartara | import Data.Attoparsec.Text.Lazy as A |
36 | d78970ba | Michele Tartara | import Data.Maybe |
37 | 332b1340 | Michele Tartara | import Data.Text.Lazy (pack, unpack) |
38 | d78970ba | Michele Tartara | import Network.BSD (getHostName) |
39 | d78970ba | Michele Tartara | import qualified Text.JSON as J |
40 | 332b1340 | Michele Tartara | |
41 | 332b1340 | Michele Tartara | import qualified Ganeti.BasicTypes as BT |
42 | 332b1340 | Michele Tartara | import qualified Ganeti.Constants as C |
43 | 332b1340 | Michele Tartara | import Ganeti.Block.Drbd.Parser(drbdStatusParser) |
44 | d78970ba | Michele Tartara | import Ganeti.Block.Drbd.Types(DrbdInstMinor) |
45 | 332b1340 | Michele Tartara | import Ganeti.Common |
46 | d78970ba | Michele Tartara | import Ganeti.Confd.Client |
47 | d78970ba | Michele Tartara | import Ganeti.Confd.Types |
48 | 55abd2c7 | Iustin Pop | import Ganeti.DataCollectors.CLI |
49 | e71c47d3 | Michele Tartara | import Ganeti.DataCollectors.Types |
50 | 332b1340 | Michele Tartara | import Ganeti.Utils |
51 | 332b1340 | Michele Tartara | |
52 | 332b1340 | Michele Tartara | |
53 | 332b1340 | Michele Tartara | -- | The default path of the DRBD status file. |
54 | 332b1340 | Michele Tartara | -- It is hardcoded because it is not likely to change. |
55 | 332b1340 | Michele Tartara | defaultFile :: FilePath |
56 | 332b1340 | Michele Tartara | defaultFile = C.drbdStatusFile |
57 | 332b1340 | Michele Tartara | |
58 | 332b1340 | Michele Tartara | -- | The default setting for the maximum amount of not parsed character to |
59 | 332b1340 | Michele Tartara | -- print in case of error. |
60 | 332b1340 | Michele Tartara | -- It is set to use most of the screen estate on a standard 80x25 terminal. |
61 | 332b1340 | Michele Tartara | -- TODO: add the possibility to set this with a command line parameter. |
62 | 332b1340 | Michele Tartara | defaultCharNum :: Int |
63 | 332b1340 | Michele Tartara | defaultCharNum = 80*20 |
64 | 332b1340 | Michele Tartara | |
65 | e71c47d3 | Michele Tartara | -- | The name of this data collector. |
66 | e71c47d3 | Michele Tartara | dcName :: String |
67 | e71c47d3 | Michele Tartara | dcName = "drbd" |
68 | e71c47d3 | Michele Tartara | |
69 | e71c47d3 | Michele Tartara | -- | The version number for the data format of this data collector. |
70 | e71c47d3 | Michele Tartara | dcFormatVersion :: Int |
71 | e71c47d3 | Michele Tartara | dcFormatVersion = 1 |
72 | e71c47d3 | Michele Tartara | |
73 | 332b1340 | Michele Tartara | options :: IO [OptType] |
74 | d78970ba | Michele Tartara | options = |
75 | d78970ba | Michele Tartara | return |
76 | d78970ba | Michele Tartara | [ oDrbdStatus |
77 | d78970ba | Michele Tartara | , oDrbdPairing |
78 | d78970ba | Michele Tartara | ] |
79 | 332b1340 | Michele Tartara | |
80 | 332b1340 | Michele Tartara | -- | The list of arguments supported by the program. |
81 | 332b1340 | Michele Tartara | arguments :: [ArgCompletion] |
82 | d78970ba | Michele Tartara | arguments = [ArgCompletion OptComplFile 0 (Just 0)] |
83 | 332b1340 | Michele Tartara | |
84 | 332b1340 | Michele Tartara | -- * Command line options |
85 | 332b1340 | Michele Tartara | |
86 | d78970ba | Michele Tartara | -- | Get information about the pairing of DRBD minors and Ganeti instances |
87 | d78970ba | Michele Tartara | -- on the current node. The information is taken from the Confd client |
88 | d78970ba | Michele Tartara | -- or, if a filename is specified, from a JSON encoded file (for testing |
89 | d78970ba | Michele Tartara | -- purposes). |
90 | d78970ba | Michele Tartara | getPairingInfo :: Maybe String -> IO (BT.Result [DrbdInstMinor]) |
91 | d78970ba | Michele Tartara | getPairingInfo Nothing = do |
92 | d78970ba | Michele Tartara | curNode <- getHostName |
93 | d78970ba | Michele Tartara | client <- getConfdClient |
94 | d78970ba | Michele Tartara | reply <- query client ReqNodeDrbd $ PlainQuery curNode |
95 | d78970ba | Michele Tartara | return $ |
96 | d78970ba | Michele Tartara | case fmap (J.readJSONs . confdReplyAnswer) reply of |
97 | d78970ba | Michele Tartara | Just (J.Ok instMinor) -> BT.Ok instMinor |
98 | d78970ba | Michele Tartara | Just (J.Error msg) -> BT.Bad msg |
99 | d78970ba | Michele Tartara | Nothing -> BT.Bad "No answer from the Confd server" |
100 | d78970ba | Michele Tartara | getPairingInfo (Just filename) = do |
101 | d78970ba | Michele Tartara | content <- readFile filename |
102 | d78970ba | Michele Tartara | return $ |
103 | d78970ba | Michele Tartara | case J.decode content of |
104 | d78970ba | Michele Tartara | J.Ok instMinor -> BT.Ok instMinor |
105 | d78970ba | Michele Tartara | J.Error msg -> BT.Bad msg |
106 | d78970ba | Michele Tartara | |
107 | e71c47d3 | Michele Tartara | -- | This function builds a report with the DRBD status. |
108 | e71c47d3 | Michele Tartara | buildDRBDReport :: FilePath -> Maybe FilePath -> IO DCReport |
109 | e71c47d3 | Michele Tartara | buildDRBDReport statusFile pairingFile = do |
110 | 332b1340 | Michele Tartara | contents <- |
111 | e71c47d3 | Michele Tartara | ((E.try $ readFile statusFile) :: IO (Either IOError String)) >>= |
112 | 638e0a6f | Iustin Pop | exitIfBad "reading from file" . either (BT.Bad . show) BT.Ok |
113 | e71c47d3 | Michele Tartara | pairingResult <- getPairingInfo pairingFile |
114 | d78970ba | Michele Tartara | pairing <- exitIfBad "Can't get pairing info" pairingResult |
115 | e71c47d3 | Michele Tartara | jsonData <- |
116 | d78970ba | Michele Tartara | case A.parse (drbdStatusParser pairing) $ pack contents of |
117 | 332b1340 | Michele Tartara | A.Fail unparsedText contexts errorMessage -> exitErr $ |
118 | 332b1340 | Michele Tartara | show (Prelude.take defaultCharNum $ unpack unparsedText) ++ "\n" |
119 | 332b1340 | Michele Tartara | ++ show contexts ++ "\n" ++ errorMessage |
120 | e71c47d3 | Michele Tartara | A.Done _ drbdStatus -> return $ J.showJSON drbdStatus |
121 | e71c47d3 | Michele Tartara | buildReport dcName Nothing dcFormatVersion jsonData |
122 | e71c47d3 | Michele Tartara | |
123 | e71c47d3 | Michele Tartara | -- | Main function. |
124 | e71c47d3 | Michele Tartara | main :: Options -> [String] -> IO () |
125 | e71c47d3 | Michele Tartara | main opts args = do |
126 | e71c47d3 | Michele Tartara | let statusFile = fromMaybe defaultFile $ optDrbdStatus opts |
127 | e71c47d3 | Michele Tartara | pairingFile = optDrbdPairing opts |
128 | e71c47d3 | Michele Tartara | unless (null args) . exitErr $ "This program takes exactly zero" ++ |
129 | e71c47d3 | Michele Tartara | " arguments, got '" ++ unwords args ++ "'" |
130 | e71c47d3 | Michele Tartara | report <- buildDRBDReport statusFile pairingFile |
131 | e71c47d3 | Michele Tartara | putStrLn $ J.encode report |