root / src / Ganeti / ConstantUtils.hs @ cdac0552
History | View | Annotate | Download (4 kB)
1 |
{-| ConstantUtils contains the helper functions for constants |
---|---|
2 |
|
3 |
This module cannot be merged with 'Ganeti.Utils' because it would |
4 |
create a circular dependency if imported, for example, from |
5 |
'Ganeti.Constants'. |
6 |
|
7 |
-} |
8 |
|
9 |
{- |
10 |
|
11 |
Copyright (C) 2013 Google Inc. |
12 |
|
13 |
This program is free software; you can redistribute it and/or modify |
14 |
it under the terms of the GNU General Public License as published by |
15 |
the Free Software Foundation; either version 2 of the License, or |
16 |
(at your option) any later version. |
17 |
|
18 |
This program is distributed in the hope that it will be useful, but |
19 |
WITHOUT ANY WARRANTY; without even the implied warranty of |
20 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
21 |
General Public License for more details. |
22 |
|
23 |
You should have received a copy of the GNU General Public License |
24 |
along with this program; if not, write to the Free Software |
25 |
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
26 |
02110-1301, USA. |
27 |
|
28 |
-} |
29 |
module Ganeti.ConstantUtils where |
30 |
|
31 |
import Data.Set (Set) |
32 |
import qualified Data.Set as Set (fromList, toList) |
33 |
|
34 |
import Ganeti.THH (PyValue(..)) |
35 |
import Ganeti.PyValueInstances () |
36 |
|
37 |
-- | FrozenSet wraps a Haskell 'Set' |
38 |
-- |
39 |
-- See 'PyValue' instance for 'FrozenSet'. |
40 |
newtype FrozenSet a = FrozenSet { unFrozenSet :: Set a } |
41 |
deriving (Eq, Show) |
42 |
|
43 |
-- | Converts a Haskell 'Set' into a Python 'frozenset' |
44 |
-- |
45 |
-- This instance was supposed to be for 'Set' instead of 'FrozenSet'. |
46 |
-- However, 'ghc-6.12.1' seems to be crashing with 'segmentation |
47 |
-- fault' due to the presence of more than one instance of 'Set', |
48 |
-- namely, this one and the one in 'Ganeti.OpCodes'. For this reason, |
49 |
-- we wrap 'Set' into 'FrozenSet'. |
50 |
instance PyValue a => PyValue (FrozenSet a) where |
51 |
showValue s = "frozenset(" ++ showValue (Set.toList (unFrozenSet s)) ++ ")" |
52 |
|
53 |
mkSet :: Ord a => [a] -> FrozenSet a |
54 |
mkSet = FrozenSet . Set.fromList |
55 |
|
56 |
-- | 'Protocol' represents the protocols used by the daemons |
57 |
data Protocol = Tcp | Udp |
58 |
deriving (Show) |
59 |
|
60 |
-- | 'PyValue' instance of 'Protocol' |
61 |
-- |
62 |
-- This instance is used by the Haskell to Python constants |
63 |
instance PyValue Protocol where |
64 |
showValue Tcp = "\"tcp\"" |
65 |
showValue Udp = "\"udp\"" |
66 |
|
67 |
-- | Failure exit code |
68 |
-- |
69 |
-- These are defined here and not in 'Ganeti.HsConstants' together with |
70 |
-- the other exit codes in order to avoid a circular dependency |
71 |
-- between 'Ganeti.HsConstants' and 'Ganeti.Runtime' |
72 |
exitFailure :: Int |
73 |
exitFailure = 1 |
74 |
|
75 |
-- | Console device |
76 |
-- |
77 |
-- This is defined here and not in 'Ganeti.HsConstants' order to avoid |
78 |
-- a circular dependency between 'Ganeti.HsConstants' and |
79 |
-- 'Ganeti.Logging' |
80 |
devConsole :: String |
81 |
devConsole = "/dev/console" |
82 |
|
83 |
-- | Random uuid generator |
84 |
-- |
85 |
-- This is defined here and not in 'Ganeti.HsConstants' order to avoid |
86 |
-- a circular dependendy between 'Ganeti.HsConstants' and |
87 |
-- 'Ganeti.Types' |
88 |
randomUuidFile :: String |
89 |
randomUuidFile = "/proc/sys/kernel/random/uuid" |
90 |
|
91 |
-- * Priority levels |
92 |
-- |
93 |
-- This is defined here and not in 'Ganeti.Types' in order to avoid a |
94 |
-- GHC stage restriction and because there is no suitable 'declareADT' |
95 |
-- variant that handles integer values directly. |
96 |
|
97 |
priorityLow :: Int |
98 |
priorityLow = 10 |
99 |
|
100 |
priorityNormal :: Int |
101 |
priorityNormal = 0 |
102 |
|
103 |
priorityHigh :: Int |
104 |
priorityHigh = -10 |
105 |
|
106 |
-- | Calculates int version number from major, minor and revision |
107 |
-- numbers. |
108 |
buildVersion :: Int -> Int -> Int -> Int |
109 |
buildVersion major minor revision = |
110 |
1000000 * major + 10000 * minor + 1 * revision |
111 |
|
112 |
-- | Confd protocol version |
113 |
-- |
114 |
-- This is defined here in order to avoid a circular dependency |
115 |
-- between 'Ganeti.Confd.Types' and 'Ganeti.HsConstants'. |
116 |
confdProtocolVersion :: Int |
117 |
confdProtocolVersion = 1 |
118 |
|
119 |
-- * Confd request query fields. |
120 |
-- |
121 |
-- These are defined here and not in 'Ganeti.Types' due to GHC stage |
122 |
-- restrictions concerning Template Haskell. They are also not |
123 |
-- defined in 'Ganeti.HsConstants' in order to avoid a circular |
124 |
-- dependency between that module and 'Ganeti.Types'. |
125 |
|
126 |
confdReqqLink :: String |
127 |
confdReqqLink = "0" |
128 |
|
129 |
confdReqqIp :: String |
130 |
confdReqqIp = "1" |
131 |
|
132 |
confdReqqIplist :: String |
133 |
confdReqqIplist = "2" |
134 |
|
135 |
confdReqqFields :: String |
136 |
confdReqqFields = "3" |