root / htools / Ganeti / Config.hs @ eaa64cd8
History | View | Annotate | Download (4.1 kB)
1 |
{-| Implementation of the Ganeti configuration database. |
---|---|
2 |
|
3 |
-} |
4 |
|
5 |
{- |
6 |
|
7 |
Copyright (C) 2011, 2012 Google Inc. |
8 |
|
9 |
This program is free software; you can redistribute it and/or modify |
10 |
it under the terms of the GNU General Public License as published by |
11 |
the Free Software Foundation; either version 2 of the License, or |
12 |
(at your option) any later version. |
13 |
|
14 |
This program is distributed in the hope that it will be useful, but |
15 |
WITHOUT ANY WARRANTY; without even the implied warranty of |
16 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
17 |
General Public License for more details. |
18 |
|
19 |
You should have received a copy of the GNU General Public License |
20 |
along with this program; if not, write to the Free Software |
21 |
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
22 |
02110-1301, USA. |
23 |
|
24 |
-} |
25 |
|
26 |
module Ganeti.Config |
27 |
( LinkIpMap |
28 |
, loadConfig |
29 |
, getNodeInstances |
30 |
, getDefaultNicLink |
31 |
, getInstancesIpByLink |
32 |
, getNode |
33 |
, getInstance |
34 |
, getInstPrimaryNode |
35 |
, buildLinkIpInstnameMap |
36 |
) where |
37 |
|
38 |
import Data.List (foldl') |
39 |
import qualified Data.Map as M |
40 |
import qualified Text.JSON as J |
41 |
|
42 |
import Ganeti.HTools.JSON |
43 |
import Ganeti.BasicTypes |
44 |
|
45 |
import qualified Ganeti.Constants as C |
46 |
import Ganeti.Objects |
47 |
|
48 |
-- | Type alias for the link and ip map. |
49 |
type LinkIpMap = M.Map String (M.Map String String) |
50 |
|
51 |
-- | Reads the config file. |
52 |
readConfig :: FilePath -> IO String |
53 |
readConfig = readFile |
54 |
|
55 |
-- | Parses the configuration file. |
56 |
parseConfig :: String -> Result ConfigData |
57 |
parseConfig = fromJResult "parsing configuration" . J.decodeStrict |
58 |
|
59 |
-- | Wrapper over 'readConfig' and 'parseConfig'. |
60 |
loadConfig :: FilePath -> IO (Result ConfigData) |
61 |
loadConfig = fmap parseConfig . readConfig |
62 |
|
63 |
-- * Query functions |
64 |
|
65 |
-- | Get instances of a given node. |
66 |
getNodeInstances :: ConfigData -> String -> ([Instance], [Instance]) |
67 |
getNodeInstances cfg nname = |
68 |
let all_inst = M.elems . configInstances $ cfg |
69 |
pri_inst = filter ((== nname) . instPrimaryNode) all_inst |
70 |
-- FIXME: actually compute the secondary nodes |
71 |
sec_inst = undefined |
72 |
in (pri_inst, sec_inst) |
73 |
|
74 |
-- | Returns the default cluster link. |
75 |
getDefaultNicLink :: ConfigData -> String |
76 |
getDefaultNicLink = |
77 |
nicpLink . (M.! C.ppDefault) . clusterNicparams . configCluster |
78 |
|
79 |
-- | Returns instances of a given link. |
80 |
getInstancesIpByLink :: LinkIpMap -> String -> [String] |
81 |
getInstancesIpByLink linkipmap link = |
82 |
M.keys $ M.findWithDefault M.empty link linkipmap |
83 |
|
84 |
-- | Looks up a node. |
85 |
getNode :: ConfigData -> String -> Result Node |
86 |
getNode cfg name = |
87 |
maybe (Bad $ "Node " ++ name ++ " not found") Ok $ |
88 |
M.lookup name (configNodes cfg) |
89 |
|
90 |
-- | Looks up an instance. |
91 |
getInstance :: ConfigData -> String -> Result Instance |
92 |
getInstance cfg name = |
93 |
maybe (Bad $ "Instance " ++ name ++ " not found") Ok $ |
94 |
M.lookup name (configInstances cfg) |
95 |
|
96 |
-- | Looks up an instance's primary node. |
97 |
getInstPrimaryNode :: ConfigData -> String -> Result Node |
98 |
getInstPrimaryNode cfg name = |
99 |
getInstance cfg name >>= return . instPrimaryNode >>= getNode cfg |
100 |
|
101 |
-- | Builds link -> ip -> instname map. |
102 |
-- |
103 |
-- TODO: improve this by splitting it into multiple independent functions: |
104 |
-- |
105 |
-- * abstract the \"fetch instance with filled params\" functionality |
106 |
-- |
107 |
-- * abstsract the [instance] -> [(nic, instance_name)] part |
108 |
-- |
109 |
-- * etc. |
110 |
buildLinkIpInstnameMap :: ConfigData -> LinkIpMap |
111 |
buildLinkIpInstnameMap cfg = |
112 |
let cluster = configCluster cfg |
113 |
instances = M.elems . configInstances $ cfg |
114 |
defparams = (M.!) (clusterNicparams cluster) C.ppDefault |
115 |
nics = concatMap (\i -> [(instName i, nic) | nic <- instNics i]) |
116 |
instances |
117 |
in foldl' (\accum (iname, nic) -> |
118 |
let pparams = nicNicparams nic |
119 |
fparams = fillNICParams defparams pparams |
120 |
link = nicpLink fparams |
121 |
in case nicIp nic of |
122 |
Nothing -> accum |
123 |
Just ip -> let oldipmap = M.findWithDefault (M.empty) |
124 |
link accum |
125 |
newipmap = M.insert ip iname oldipmap |
126 |
in M.insert link newipmap accum |
127 |
) M.empty nics |