1 {-| Parsing data from a simulated description of the cluster.
3 This module holds the code for parsing a cluster description.
9 Copyright (C) 2009, 2010, 2011, 2012 Google Inc.
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.
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.
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
28 module Ganeti.HTools.Simu
33 import Control.Monad (mplus)
34 import Text.Printf (printf)
36 import Ganeti.HTools.Utils
37 import Ganeti.HTools.Types
38 import Ganeti.HTools.Loader
39 import qualified Ganeti.HTools.Container as Container
40 import qualified Ganeti.HTools.Group as Group
41 import qualified Ganeti.HTools.Node as Node
43 -- | Parse a shortened policy string (for command line usage).
44 apolAbbrev :: String -> Result AllocPolicy
45 apolAbbrev c | c == "p" = return AllocPreferred
46 | c == "a" = return AllocLastResort
47 | c == "u" = return AllocUnallocable
48 | otherwise = fail $ "Cannot parse AllocPolicy abbreviation '"
51 -- | Parse the string description into nodes.
52 parseDesc :: String -> [String]
53 -> Result (AllocPolicy, Int, Int, Int, Int, Int)
54 parseDesc _ [a, n, d, m, c, s] = do
55 apol <- allocPolicyFromRaw a `mplus` apolAbbrev a
56 ncount <- tryRead "node count" n
57 disk <- annotateResult "disk size" (parseUnit d)
58 mem <- annotateResult "memory size" (parseUnit m)
59 cpu <- tryRead "cpu count" c
60 spindles <- tryRead "spindles" s
61 return (apol, ncount, disk, mem, cpu, spindles)
63 parseDesc desc [a, n, d, m, c] = parseDesc desc [a, n, d, m, c, "1"]
67 "Invalid cluster specification, expected 6 comma-separated\
68 \ sections (allocation policy, node count, disk size,\
69 \ memory size, number of CPUs, spindles) but got %d: '%s'"
72 -- | Creates a node group with the given specifications.
73 createGroup :: Int -- ^ The group index
74 -> String -- ^ The group specification
75 -> Result (Group.Group, [Node.Node])
76 createGroup grpIndex spec = do
77 (apol, ncount, disk, mem, cpu, spindles) <- parseDesc spec $
79 let nodes = map (\idx ->
80 Node.create (printf "node-%02d-%03d" grpIndex idx)
81 (fromIntegral mem) 0 mem
82 (fromIntegral disk) disk
83 (fromIntegral cpu) False spindles grpIndex
85 grp = Group.create (printf "group-%02d" grpIndex)
86 (printf "fake-uuid-%02d" grpIndex) apol defIPolicy
87 return (Group.setIdx grp grpIndex, nodes)
89 -- | Builds the cluster data from node\/instance files.
90 parseData :: [String] -- ^ Cluster description in text format
93 grpNodeData <- mapM (uncurry createGroup) $ zip [1..] ndata
94 let (groups, nodes) = unzip grpNodeData
96 let ktn = map (\(idx, n) -> (idx, Node.setIdx n idx))
98 ktg = map (\g -> (Group.idx g, g)) groups
99 return (ClusterData (Container.fromList ktg)
100 (Container.fromList ktn) Container.empty [] defIPolicy)
102 -- | Builds the cluster data from node\/instance files.
103 loadData :: [String] -- ^ Cluster description in text format
104 -> IO (Result ClusterData)
105 loadData = -- IO monad, just for consistency with the other loaders