root / htools / Ganeti / DataCollectors / Drbd.hs @ 638e0a6f
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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 | 332b1340 | Michele Tartara | import Data.Attoparsec.Text.Lazy as A |
35 | 332b1340 | Michele Tartara | import Data.Text.Lazy (pack, unpack) |
36 | 332b1340 | Michele Tartara | import Text.JSON |
37 | 332b1340 | Michele Tartara | |
38 | 332b1340 | Michele Tartara | import qualified Ganeti.BasicTypes as BT |
39 | 332b1340 | Michele Tartara | import qualified Ganeti.Constants as C |
40 | 332b1340 | Michele Tartara | import Ganeti.Block.Drbd.Parser(drbdStatusParser) |
41 | 332b1340 | Michele Tartara | import Ganeti.Common |
42 | 55abd2c7 | Iustin Pop | import Ganeti.DataCollectors.CLI |
43 | 332b1340 | Michele Tartara | import Ganeti.Utils |
44 | 332b1340 | Michele Tartara | |
45 | 332b1340 | Michele Tartara | |
46 | 332b1340 | Michele Tartara | -- | The default path of the DRBD status file. |
47 | 332b1340 | Michele Tartara | -- It is hardcoded because it is not likely to change. |
48 | 332b1340 | Michele Tartara | defaultFile :: FilePath |
49 | 332b1340 | Michele Tartara | defaultFile = C.drbdStatusFile |
50 | 332b1340 | Michele Tartara | |
51 | 332b1340 | Michele Tartara | -- | The default setting for the maximum amount of not parsed character to |
52 | 332b1340 | Michele Tartara | -- print in case of error. |
53 | 332b1340 | Michele Tartara | -- It is set to use most of the screen estate on a standard 80x25 terminal. |
54 | 332b1340 | Michele Tartara | -- TODO: add the possibility to set this with a command line parameter. |
55 | 332b1340 | Michele Tartara | defaultCharNum :: Int |
56 | 332b1340 | Michele Tartara | defaultCharNum = 80*20 |
57 | 332b1340 | Michele Tartara | |
58 | 332b1340 | Michele Tartara | options :: IO [OptType] |
59 | 332b1340 | Michele Tartara | options = return [] |
60 | 332b1340 | Michele Tartara | |
61 | 332b1340 | Michele Tartara | -- | The list of arguments supported by the program. |
62 | 332b1340 | Michele Tartara | arguments :: [ArgCompletion] |
63 | 332b1340 | Michele Tartara | arguments = [ArgCompletion OptComplFile 0 (Just 1)] |
64 | 332b1340 | Michele Tartara | |
65 | 332b1340 | Michele Tartara | -- * Command line options |
66 | 332b1340 | Michele Tartara | |
67 | 332b1340 | Michele Tartara | -- | Main function. |
68 | 332b1340 | Michele Tartara | main :: Options -> [String] -> IO () |
69 | 332b1340 | Michele Tartara | main _ args = do |
70 | 638e0a6f | Iustin Pop | proc_drbd <- case args of |
71 | 638e0a6f | Iustin Pop | [ ] -> return defaultFile |
72 | 638e0a6f | Iustin Pop | [x] -> return x |
73 | 638e0a6f | Iustin Pop | _ -> exitErr $ "This program takes only one argument," ++ |
74 | 638e0a6f | Iustin Pop | " got '" ++ unwords args ++ "'" |
75 | 332b1340 | Michele Tartara | contents <- |
76 | 638e0a6f | Iustin Pop | ((E.try $ readFile proc_drbd) :: IO (Either IOError String)) >>= |
77 | 638e0a6f | Iustin Pop | exitIfBad "reading from file" . either (BT.Bad . show) BT.Ok |
78 | 332b1340 | Michele Tartara | output <- |
79 | 332b1340 | Michele Tartara | case A.parse drbdStatusParser $ pack contents of |
80 | 332b1340 | Michele Tartara | A.Fail unparsedText contexts errorMessage -> exitErr $ |
81 | 332b1340 | Michele Tartara | show (Prelude.take defaultCharNum $ unpack unparsedText) ++ "\n" |
82 | 332b1340 | Michele Tartara | ++ show contexts ++ "\n" ++ errorMessage |
83 | 332b1340 | Michele Tartara | A.Done _ drbdStatus -> return $ encode drbdStatus |
84 | 332b1340 | Michele Tartara | putStrLn output |