1 {-| Generic data loader
3 This module holds the common code for parsing the input data after it
4 has been loaded from external sources.
10 Copyright (C) 2009 Google Inc.
12 This program is free software; you can redistribute it and/or modify
13 it under the terms of the GNU General Public License as published by
14 the Free Software Foundation; either version 2 of the License, or
15 (at your option) any later version.
17 This program is distributed in the hope that it will be useful, but
18 WITHOUT ANY WARRANTY; without even the implied warranty of
19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 General Public License for more details.
22 You should have received a copy of the GNU General Public License
23 along with this program; if not, write to the Free Software
24 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
29 module Ganeti.HTools.Loader
40 import Data.Function (on)
42 import Data.Maybe (fromJust)
43 import Text.Printf (printf)
45 import qualified Ganeti.HTools.Container as Container
46 import qualified Ganeti.HTools.Instance as Instance
47 import qualified Ganeti.HTools.Node as Node
49 import Ganeti.HTools.Types
53 -- | The exclusion tag prefix
54 exTagsPrefix :: String
55 exTagsPrefix = "htools:iextags:"
59 {-| The iallocator request type.
61 This type denotes what request we got from Ganeti and also holds
62 request-specific fields.
66 = Allocate Instance.Instance Int -- ^ A new instance allocation
67 | Relocate Idx Int [Ndx] -- ^ Move an instance to a new
69 | Evacuate [Ndx] -- ^ Evacuate nodes
72 -- | A complete request, as received from Ganeti.
73 data Request = Request RqType Node.List Instance.List [String] String
78 -- | Lookups a node into an assoc list.
79 lookupNode :: (Monad m) => [(String, Ndx)] -> String -> String -> m Ndx
80 lookupNode ktn inst node =
81 case lookup node ktn of
82 Nothing -> fail $ "Unknown node '" ++ node ++ "' for instance " ++ inst
83 Just idx -> return idx
85 -- | Lookups an instance into an assoc list.
86 lookupInstance :: (Monad m) => [(String, Idx)] -> String -> m Idx
87 lookupInstance kti inst =
88 case lookup inst kti of
89 Nothing -> fail $ "Unknown instance '" ++ inst ++ "'"
90 Just idx -> return idx
92 -- | Given a list of elements (and their names), assign indices to them.
93 assignIndices :: (Element a) =>
95 -> (NameAssoc, [(Int, a)])
97 unzip . map (\ (idx, (k, v)) -> ((k, idx), (idx, setIdx v idx)))
100 -- | Assoc element comparator
101 assocEqual :: (Eq a) => (a, b) -> (a, b) -> Bool
102 assocEqual = (==) `on` fst
104 -- | For each instance, add its index to its primary and secondary nodes.
105 fixNodes :: [(Ndx, Node.Node)]
107 -> [(Ndx, Node.Node)]
110 pdx = Instance.pNode inst
111 sdx = Instance.sNode inst
112 pold = fromJust $ lookup pdx accu
113 pnew = Node.setPri pold inst
114 ac1 = deleteBy assocEqual (pdx, pold) accu
115 ac2 = (pdx, pnew):ac1
117 if sdx /= Node.noSecondary
118 then let sold = fromJust $ lookup sdx accu
119 snew = Node.setSec sold inst
120 ac3 = deleteBy assocEqual (sdx, sold) ac2
124 -- | Remove non-selected tags from the exclusion list
125 filterExTags :: [String] -> Instance.Instance -> Instance.Instance
126 filterExTags tl inst =
127 let old_tags = Instance.tags inst
128 new_tags = filter (\tag -> any (`isPrefixOf` tag) tl)
130 in inst { Instance.tags = new_tags }
132 -- | Update the movable attribute
133 updateMovable :: [String] -> Instance.Instance -> Instance.Instance
134 updateMovable exinst inst =
135 if Instance.sNode inst == Node.noSecondary ||
136 Instance.name inst `elem` exinst
137 then Instance.setMovable inst False
140 -- | Compute the longest common suffix of a list of strings that
141 -- | starts with a dot.
142 longestDomain :: [String] -> String
143 longestDomain [] = ""
144 longestDomain (x:xs) =
145 foldr (\ suffix accu -> if all (isSuffixOf suffix) xs
148 "" $ filter (isPrefixOf ".") (tails x)
150 -- | Remove tail suffix from a string.
151 stripSuffix :: Int -> String -> String
152 stripSuffix sflen name = take (length name - sflen) name
154 -- | Extracts the exclusion tags from the cluster configuration
155 extractExTags :: [String] -> [String]
157 map (drop (length exTagsPrefix)) .
158 filter (isPrefixOf exTagsPrefix)
160 -- | Initializer function that loads the data from a node and instance
161 -- list and massages it into the correct format.
162 mergeData :: [(String, DynUtil)] -- ^ Instance utilisation data
163 -> [String] -- ^ Exclusion tags
164 -> [String] -- ^ Untouchable instances
165 -> (Node.AssocList, Instance.AssocList, [String])
166 -- ^ Data from backends
167 -> Result (Node.List, Instance.List, [String], String)
168 mergeData um extags exinsts (nl, il, tags) =
169 let il2 = Container.fromAssocList il
170 il3 = foldl' (\im (name, n_util) ->
171 case Container.findByName im name of
172 Nothing -> im -- skipping unknown instance
174 let new_i = inst { Instance.util = n_util }
175 in Container.add (Instance.idx inst) new_i im
177 allextags = extags ++ extractExTags tags
178 il4 = Container.map (filterExTags allextags .
179 updateMovable exinsts) il3
180 nl2 = foldl' fixNodes nl (Container.elems il4)
181 nl3 = Container.fromAssocList
182 (map (\ (k, v) -> (k, Node.buildPeers v il4)) nl2)
183 node_names = map (Node.name . snd) nl
184 inst_names = map (Instance.name . snd) il
185 common_suffix = longestDomain (node_names ++ inst_names)
186 csl = length common_suffix
187 snl = Container.map (\n -> setName n (stripSuffix csl $ nameOf n)) nl3
188 sil = Container.map (\i -> setName i (stripSuffix csl $ nameOf i)) il4
189 in if not $ all (`elem` inst_names) exinsts
190 then Bad $ "Some of the excluded instances are unknown: " ++
191 show (exinsts \\ inst_names)
192 else Ok (snl, sil, tags, common_suffix)
194 -- | Checks the cluster data for consistency.
195 checkData :: Node.List -> Instance.List
196 -> ([String], Node.List)
200 let nname = Node.name node
201 nilst = map (`Container.find` il) (Node.pList node)
202 dilst = filter (not . Instance.running) nilst
203 adj_mem = sum . map Instance.mem $ dilst
204 delta_mem = truncate (Node.tMem node)
209 delta_dsk = truncate (Node.tDsk node)
212 newn = Node.setFmem (Node.setXmem node delta_mem)
213 (Node.fMem node - adj_mem)
214 umsg1 = [printf "node %s is missing %d MB ram \
216 nname delta_mem (delta_dsk `div` 1024) |
217 delta_mem > 512 || delta_dsk > 1024]::[String]
218 in (msgs ++ umsg1, newn)
221 -- | Compute the amount of memory used by primary instances on a node.
222 nodeImem :: Node.Node -> Instance.List -> Int
224 let rfind = flip Container.find il
225 in sum . map (Instance.mem . rfind)
228 -- | Compute the amount of disk used by instances on a node (either primary
230 nodeIdsk :: Node.Node -> Instance.List -> Int
232 let rfind = flip Container.find il
233 in sum . map (Instance.dsk . rfind)
234 $ Node.pList node ++ Node.sList node