1 {-| Parsing data from text-files
3 This module holds the code for loading the cluster state from text
4 files, as produced by gnt-node and gnt-instance list.
10 Copyright (C) 2009, 2010, 2011 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.Text
44 import Text.Printf (printf)
46 import Ganeti.HTools.Utils
47 import Ganeti.HTools.Loader
48 import Ganeti.HTools.Types
49 import qualified Ganeti.HTools.Container as Container
50 import qualified Ganeti.HTools.Group as Group
51 import qualified Ganeti.HTools.Node as Node
52 import qualified Ganeti.HTools.Instance as Instance
54 -- | Serialize a single group
55 serializeGroup :: Group.Group -> String
57 printf "%s|%s|%s" (Group.name grp) (Group.uuid grp)
58 (apolToString (Group.allocPolicy grp))
60 -- | Generate group file data from a group list
61 serializeGroups :: Group.List -> String
62 serializeGroups = unlines . map serializeGroup . Container.elems
64 -- | Serialize a single node
65 serializeNode :: Group.List -> Node.Node -> String
66 serializeNode gl node =
67 printf "%s|%.0f|%d|%d|%.0f|%d|%.0f|%c|%s" (Node.name node)
68 (Node.tMem node) (Node.nMem node) (Node.fMem node)
69 (Node.tDsk node) (Node.fDsk node) (Node.tCpu node)
70 (if Node.offline node then 'Y' else 'N')
72 where grp = Container.find (Node.group node) gl
74 -- | Generate node file data from node objects
75 serializeNodes :: Group.List -> Node.List -> String
76 serializeNodes gl = unlines . map (serializeNode gl) . Container.elems
78 -- | Serialize a single instance
79 serializeInstance :: Node.List -> Instance.Instance -> String
80 serializeInstance nl inst =
82 iname = Instance.name inst
83 pnode = Container.nameOf nl (Instance.pNode inst)
84 sidx = Instance.sNode inst
85 snode = (if sidx == Node.noSecondary
87 else Container.nameOf nl sidx)
89 printf "%s|%d|%d|%d|%s|%s|%s|%s"
90 iname (Instance.mem inst) (Instance.dsk inst)
91 (Instance.vcpus inst) (Instance.runSt inst)
92 pnode snode (intercalate "," (Instance.tags inst))
94 -- | Generate instance file data from instance objects
95 serializeInstances :: Node.List -> Instance.List -> String
96 serializeInstances nl =
97 unlines . map (serializeInstance nl) . Container.elems
99 -- | Generate complete cluster data from node and instance lists
100 serializeCluster :: ClusterData -> String
101 serializeCluster (ClusterData gl nl il ctags) =
102 let gdata = serializeGroups gl
103 ndata = serializeNodes gl nl
104 idata = serializeInstances nl il
105 -- note: not using 'unlines' as that adds too many newlines
106 in intercalate "\n" [gdata, ndata, idata, unlines ctags]
108 -- | Load a group from a field list.
109 loadGroup :: (Monad m) => [String] -> m (String, Group.Group)
110 loadGroup [name, gid, apol] = do
111 xapol <- apolFromString apol
112 return (gid, Group.create name gid xapol)
114 loadGroup s = fail $ "Invalid/incomplete group data: '" ++ show s ++ "'"
116 -- | Load a node from a field list.
117 loadNode :: (Monad m) => NameAssoc -> [String] -> m (String, Node.Node)
118 loadNode ktg [name, tm, nm, fm, td, fd, tc, fo, gu] = do
119 gdx <- lookupGroup ktg name gu
121 if any (== "?") [tm,nm,fm,td,fd,tc] || fo == "Y" then
122 return $ Node.create name 0 0 0 0 0 0 True gdx
124 vtm <- tryRead name tm
125 vnm <- tryRead name nm
126 vfm <- tryRead name fm
127 vtd <- tryRead name td
128 vfd <- tryRead name fd
129 vtc <- tryRead name tc
130 return $ Node.create name vtm vnm vfm vtd vfd vtc False gdx
131 return (name, new_node)
132 loadNode _ s = fail $ "Invalid/incomplete node data: '" ++ show s ++ "'"
134 -- | Load an instance from a field list.
135 loadInst :: (Monad m) =>
136 NameAssoc -> [String] -> m (String, Instance.Instance)
137 loadInst ktn [name, mem, dsk, vcpus, status, pnode, snode, tags] = do
138 pidx <- lookupNode ktn name pnode
139 sidx <- (if null snode then return Node.noSecondary
140 else lookupNode ktn name snode)
141 vmem <- tryRead name mem
142 vdsk <- tryRead name dsk
143 vvcpus <- tryRead name vcpus
144 when (sidx == pidx) $ fail $ "Instance " ++ name ++
145 " has same primary and secondary node - " ++ pnode
146 let vtags = sepSplit ',' tags
147 newinst = Instance.create name vmem vdsk vvcpus status vtags
149 return (name, newinst)
150 loadInst _ s = fail $ "Invalid/incomplete instance data: '" ++ show s ++ "'"
152 -- | Convert newline and delimiter-separated text.
154 -- This function converts a text in tabular format as generated by
155 -- @gnt-instance list@ and @gnt-node list@ to a list of objects using
156 -- a supplied conversion function.
157 loadTabular :: (Monad m, Element a) =>
158 [String] -> ([String] -> m (String, a))
159 -> m (NameAssoc, Container.Container a)
160 loadTabular lines_data convert_fn = do
161 let rows = map (sepSplit '|') lines_data
162 kerows <- mapM convert_fn rows
163 return $ assignIndices kerows
165 -- | Load the cluser data from disk.
166 readData :: String -- ^ Path to the text file
170 -- | Builds the cluster data from text input.
171 parseData :: String -- ^ Text data
172 -> Result ClusterData
174 let flines = lines fdata
175 (glines, nlines, ilines, ctags) <-
176 case sepSplit "" flines of
177 [a, b, c, d] -> Ok (a, b, c, d)
178 xs -> Bad $ printf "Invalid format of the input file: %d sections\
179 \ instead of 4" (length xs)
180 {- group file: name uuid -}
181 (ktg, gl) <- loadTabular glines loadGroup
182 {- node file: name t_mem n_mem f_mem t_disk f_disk -}
183 (ktn, nl) <- loadTabular nlines (loadNode ktg)
184 {- instance file: name mem disk status pnode snode -}
185 (_, il) <- loadTabular ilines (loadInst ktn)
186 {- the tags are simply line-based, no processing needed -}
187 return (ClusterData gl nl il ctags)
189 -- | Top level function for data loading
190 loadData :: String -- ^ Path to the text file
191 -> IO (Result ClusterData)
192 loadData = fmap parseData . readData