root / htools / Ganeti / Ssconf.hs @ aa3adf35
History | View | Annotate | Download (4.5 kB)
1 |
{-# LANGUAGE TemplateHaskell #-} |
---|---|
2 |
|
3 |
{-| Implementation of the Ganeti Ssconf interface. |
4 |
|
5 |
-} |
6 |
|
7 |
{- |
8 |
|
9 |
Copyright (C) 2012 Google Inc. |
10 |
|
11 |
This program is free software; you can redistribute it and/or modify |
12 |
it under the terms of the GNU General Public License as published by |
13 |
the Free Software Foundation; either version 2 of the License, or |
14 |
(at your option) any later version. |
15 |
|
16 |
This program is distributed in the hope that it will be useful, but |
17 |
WITHOUT ANY WARRANTY; without even the implied warranty of |
18 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
19 |
General Public License for more details. |
20 |
|
21 |
You should have received a copy of the GNU General Public License |
22 |
along with this program; if not, write to the Free Software |
23 |
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
24 |
02110-1301, USA. |
25 |
|
26 |
-} |
27 |
|
28 |
module Ganeti.Ssconf |
29 |
( SSKey(..) |
30 |
, sSKeyToRaw |
31 |
, sSKeyFromRaw |
32 |
, getPrimaryIPFamily |
33 |
) where |
34 |
|
35 |
import Ganeti.THH |
36 |
|
37 |
import Control.Monad (liftM) |
38 |
import Data.Char (isSpace) |
39 |
import Data.Maybe (fromMaybe) |
40 |
import qualified Network.Socket as Socket |
41 |
import System.FilePath ((</>)) |
42 |
import System.IO.Error |
43 |
|
44 |
import qualified Ganeti.Constants as C |
45 |
import Ganeti.BasicTypes |
46 |
import Ganeti.HTools.Utils |
47 |
|
48 |
-- | Maximum ssconf file size we support. |
49 |
maxFileSize :: Int |
50 |
maxFileSize = 131072 |
51 |
|
52 |
$(declareSADT "SSKey" |
53 |
[ ("SSClusterName", 'C.ssClusterName) |
54 |
, ("SSClusterTags", 'C.ssClusterTags) |
55 |
, ("SSFileStorageDir", 'C.ssFileStorageDir) |
56 |
, ("SSSharedFileStorageDir", 'C.ssSharedFileStorageDir) |
57 |
, ("SSMasterCandidates", 'C.ssMasterCandidates) |
58 |
, ("SSMasterCandidatesIps", 'C.ssMasterCandidatesIps) |
59 |
, ("SSMasterIp", 'C.ssMasterIp) |
60 |
, ("SSMasterNetdev", 'C.ssMasterNetdev) |
61 |
, ("SSMasterNetmask", 'C.ssMasterNetmask) |
62 |
, ("SSMasterNode", 'C.ssMasterNode) |
63 |
, ("SSNodeList", 'C.ssNodeList) |
64 |
, ("SSNodePrimaryIps", 'C.ssNodePrimaryIps) |
65 |
, ("SSNodeSecondaryIps", 'C.ssNodeSecondaryIps) |
66 |
, ("SSOfflineNodes", 'C.ssOfflineNodes) |
67 |
, ("SSOnlineNodes", 'C.ssOnlineNodes) |
68 |
, ("SSPrimaryIpFamily", 'C.ssPrimaryIpFamily) |
69 |
, ("SSInstanceList", 'C.ssInstanceList) |
70 |
, ("SSReleaseVersion", 'C.ssReleaseVersion) |
71 |
, ("SSHypervisorList", 'C.ssHypervisorList) |
72 |
, ("SSMaintainNodeHealth", 'C.ssMaintainNodeHealth) |
73 |
, ("SSUidPool", 'C.ssUidPool) |
74 |
, ("SSNodegroups", 'C.ssNodegroups) |
75 |
]) |
76 |
|
77 |
-- | Convert a ssconf key into a (full) file path. |
78 |
keyToFilename :: Maybe FilePath -- ^ Optional config path override |
79 |
-> SSKey -- ^ ssconf key |
80 |
-> FilePath |
81 |
keyToFilename optpath key = fromMaybe C.dataDir optpath </> sSKeyToRaw key |
82 |
|
83 |
-- | Runs an IO action while transforming any error into 'Bad' |
84 |
-- values. It also accepts an optional value to use in case the error |
85 |
-- is just does not exist. |
86 |
catchIOErrors :: Maybe a -- ^ Optional default |
87 |
-> IO a -- ^ Action to run |
88 |
-> IO (Result a) |
89 |
catchIOErrors def action = |
90 |
catch (do |
91 |
result <- action |
92 |
return (Ok result) |
93 |
) (\err -> let bad_result = Bad (show err) |
94 |
in return $ if isDoesNotExistError err |
95 |
then maybe bad_result Ok def |
96 |
else bad_result) |
97 |
|
98 |
-- | Read an ssconf file. |
99 |
readSSConfFile :: Maybe FilePath -- ^ Optional config path override |
100 |
-> Maybe String -- ^ Optional default value |
101 |
-> SSKey -- ^ Desired ssconf key |
102 |
-> IO (Result String) |
103 |
readSSConfFile optpath def key = do |
104 |
result <- catchIOErrors def . readFile . keyToFilename optpath $ key |
105 |
return (liftM (take maxFileSize) result) |
106 |
|
107 |
-- | Strip space characthers (including newline). As this is |
108 |
-- expensive, should only be run on small strings. |
109 |
rstripSpace :: String -> String |
110 |
rstripSpace = reverse . dropWhile isSpace . reverse |
111 |
|
112 |
-- | Parses a string containing an IP family |
113 |
parseIPFamily :: Int -> Result Socket.Family |
114 |
parseIPFamily fam | fam == C.ip4Family = Ok Socket.AF_INET |
115 |
| fam == C.ip6Family = Ok Socket.AF_INET6 |
116 |
| otherwise = Bad $ "Unknown af_family value: " ++ show fam |
117 |
|
118 |
-- | Read the primary IP family. |
119 |
getPrimaryIPFamily :: Maybe FilePath -> IO (Result Socket.Family) |
120 |
getPrimaryIPFamily optpath = do |
121 |
result <- readSSConfFile optpath (Just (show C.ip4Family)) SSPrimaryIpFamily |
122 |
return (result >>= return . rstripSpace >>= |
123 |
tryRead "Parsing af_family" >>= parseIPFamily) |