1 {-| Implementation of the LUXI loader.
7 Copyright (C) 2009, 2010, 2011 Google Inc.
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.
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.
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
26 module Ganeti.HTools.Luxi
31 import qualified Control.Exception as E
32 import Text.JSON.Types
33 import qualified Text.JSON
35 import qualified Ganeti.Luxi as L
36 import Ganeti.HTools.Loader
37 import Ganeti.HTools.Types
38 import qualified Ganeti.HTools.Group as Group
39 import qualified Ganeti.HTools.Node as Node
40 import qualified Ganeti.HTools.Instance as Instance
41 import Ganeti.HTools.JSON
43 {-# ANN module "HLint: ignore Eta reduce" #-}
45 -- * Utility functions
47 -- | Get values behind \"data\" part of the result.
48 getData :: (Monad m) => JSValue -> m JSValue
49 getData (JSObject o) = fromObj (fromJSObject o) "data"
50 getData x = fail $ "Invalid input, expected dict entry but got " ++ show x
52 -- | Converts a (status, value) into m value, if possible.
53 parseQueryField :: (Monad m) => JSValue -> m (JSValue, JSValue)
54 parseQueryField (JSArray [status, result]) = return (status, result)
56 fail $ "Invalid query field, expected (status, value) but got " ++ show o
58 -- | Parse a result row.
59 parseQueryRow :: (Monad m) => JSValue -> m [(JSValue, JSValue)]
60 parseQueryRow (JSArray arr) = mapM parseQueryField arr
62 fail $ "Invalid query row result, expected array but got " ++ show o
64 -- | Parse an overall query result and get the [(status, value)] list
65 -- for each element queried.
66 parseQueryResult :: (Monad m) => JSValue -> m [[(JSValue, JSValue)]]
67 parseQueryResult (JSArray arr) = mapM parseQueryRow arr
69 fail $ "Invalid query result, expected array but got " ++ show o
71 -- | Prepare resulting output as parsers expect it.
72 extractArray :: (Monad m) => JSValue -> m [[(JSValue, JSValue)]]
74 getData v >>= parseQueryResult
76 -- | Testing result status for more verbose error message.
77 fromJValWithStatus :: (Text.JSON.JSON a, Monad m) => (JSValue, JSValue) -> m a
78 fromJValWithStatus (st, v) = do
80 L.checkRS st' v >>= fromJVal
82 -- | Annotate errors when converting values with owner/attribute for
84 genericConvert :: (Text.JSON.JSON a) =>
85 String -- ^ The object type
86 -> String -- ^ The object name
87 -> String -- ^ The attribute we're trying to convert
88 -> (JSValue, JSValue) -- ^ The value we're trying to convert
89 -> Result a -- ^ The annotated result
90 genericConvert otype oname oattr =
91 annotateResult (otype ++ " '" ++ oname ++
92 "', error while reading attribute '" ++
93 oattr ++ "'") . fromJValWithStatus
95 -- * Data querying functionality
97 -- | The input data for node query.
98 queryNodesMsg :: L.LuxiOp
100 L.Query L.QRNode ["name", "mtotal", "mnode", "mfree", "dtotal", "dfree",
101 "ctotal", "offline", "drained", "vm_capable",
104 -- | The input data for instance query.
105 queryInstancesMsg :: L.LuxiOp
107 L.Query L.QRInstance ["name", "disk_usage", "be/memory", "be/vcpus",
108 "status", "pnode", "snodes", "tags", "oper_ram",
109 "be/auto_balance", "disk_template"] ()
111 -- | The input data for cluster query.
112 queryClusterInfoMsg :: L.LuxiOp
113 queryClusterInfoMsg = L.QueryClusterInfo
115 -- | The input data for node group query.
116 queryGroupsMsg :: L.LuxiOp
118 L.Query L.QRGroup ["uuid", "name", "alloc_policy", "ipolicy"] ()
120 -- | Wraper over 'callMethod' doing node query.
121 queryNodes :: L.Client -> IO (Result JSValue)
122 queryNodes = L.callMethod queryNodesMsg
124 -- | Wraper over 'callMethod' doing instance query.
125 queryInstances :: L.Client -> IO (Result JSValue)
126 queryInstances = L.callMethod queryInstancesMsg
128 -- | Wrapper over 'callMethod' doing cluster information query.
129 queryClusterInfo :: L.Client -> IO (Result JSValue)
130 queryClusterInfo = L.callMethod queryClusterInfoMsg
132 -- | Wrapper over callMethod doing group query.
133 queryGroups :: L.Client -> IO (Result JSValue)
134 queryGroups = L.callMethod queryGroupsMsg
136 -- | Parse a instance list in JSON format.
137 getInstances :: NameAssoc
139 -> Result [(String, Instance.Instance)]
140 getInstances ktn arr = extractArray arr >>= mapM (parseInstance ktn)
142 -- | Construct an instance from a JSON object.
143 parseInstance :: NameAssoc
144 -> [(JSValue, JSValue)]
145 -> Result (String, Instance.Instance)
146 parseInstance ktn [ name, disk, mem, vcpus
147 , status, pnode, snodes, tags, oram
148 , auto_balance, disk_template ] = do
149 xname <- annotateResult "Parsing new instance" (fromJValWithStatus name)
150 let convert a = genericConvert "Instance" xname a
151 xdisk <- convert "disk_usage" disk
152 xmem <- case oram of -- FIXME: remove the "guessing"
153 (_, JSRational _ _) -> convert "oper_ram" oram
154 _ -> convert "be/memory" mem
155 xvcpus <- convert "be/vcpus" vcpus
156 xpnode <- convert "pnode" pnode >>= lookupNode ktn xname
157 xsnodes <- convert "snodes" snodes::Result [JSString]
158 snode <- if null xsnodes
159 then return Node.noSecondary
160 else lookupNode ktn xname (fromJSString $ head xsnodes)
161 xrunning <- convert "status" status
162 xtags <- convert "tags" tags
163 xauto_balance <- convert "auto_balance" auto_balance
164 xdt <- convert "disk_template" disk_template
165 let inst = Instance.create xname xmem xdisk xvcpus
166 xrunning xtags xauto_balance xpnode snode xdt
169 parseInstance _ v = fail ("Invalid instance query result: " ++ show v)
171 -- | Parse a node list in JSON format.
172 getNodes :: NameAssoc -> JSValue -> Result [(String, Node.Node)]
173 getNodes ktg arr = extractArray arr >>= mapM (parseNode ktg)
175 -- | Construct a node from a JSON object.
176 parseNode :: NameAssoc -> [(JSValue, JSValue)] -> Result (String, Node.Node)
177 parseNode ktg [ name, mtotal, mnode, mfree, dtotal, dfree
178 , ctotal, offline, drained, vm_capable, g_uuid ]
180 xname <- annotateResult "Parsing new node" (fromJValWithStatus name)
181 let convert a = genericConvert "Node" xname a
182 xoffline <- convert "offline" offline
183 xdrained <- convert "drained" drained
184 xvm_capable <- convert "vm_capable" vm_capable
185 xgdx <- convert "group.uuid" g_uuid >>= lookupGroup ktg xname
186 node <- if xoffline || xdrained || not xvm_capable
187 then return $ Node.create xname 0 0 0 0 0 0 True xgdx
189 xmtotal <- convert "mtotal" mtotal
190 xmnode <- convert "mnode" mnode
191 xmfree <- convert "mfree" mfree
192 xdtotal <- convert "dtotal" dtotal
193 xdfree <- convert "dfree" dfree
194 xctotal <- convert "ctotal" ctotal
195 return $ Node.create xname xmtotal xmnode xmfree
196 xdtotal xdfree xctotal False xgdx
199 parseNode _ v = fail ("Invalid node query result: " ++ show v)
201 -- | Parses the cluster tags.
202 getClusterData :: JSValue -> Result ([String], IPolicy)
203 getClusterData (JSObject obj) = do
204 let errmsg = "Parsing cluster info"
205 obj' = fromJSObject obj
206 ctags <- tryFromObj errmsg obj' "tags"
207 cpol <- tryFromObj errmsg obj' "ipolicy"
210 getClusterData _ = Bad $ "Cannot parse cluster info, not a JSON record"
212 -- | Parses the cluster groups.
213 getGroups :: JSValue -> Result [(String, Group.Group)]
214 getGroups jsv = extractArray jsv >>= mapM parseGroup
216 -- | Parses a given group information.
217 parseGroup :: [(JSValue, JSValue)] -> Result (String, Group.Group)
218 parseGroup [uuid, name, apol, ipol] = do
219 xname <- annotateResult "Parsing new group" (fromJValWithStatus name)
220 let convert a = genericConvert "Group" xname a
221 xuuid <- convert "uuid" uuid
222 xapol <- convert "alloc_policy" apol
223 xipol <- convert "ipolicy" ipol
224 return (xuuid, Group.create xname xuuid xapol xipol)
226 parseGroup v = fail ("Invalid group query result: " ++ show v)
228 -- * Main loader functionality
230 -- | Builds the cluster data by querying a given socket name.
231 readData :: String -- ^ Unix socket to use as source
232 -> IO (Result JSValue, Result JSValue, Result JSValue, Result JSValue)
238 nodes <- queryNodes s
239 instances <- queryInstances s
240 cinfo <- queryClusterInfo s
241 groups <- queryGroups s
242 return (groups, nodes, instances, cinfo)
245 -- | Converts the output of 'readData' into the internal cluster
247 parseData :: (Result JSValue, Result JSValue, Result JSValue, Result JSValue)
248 -> Result ClusterData
249 parseData (groups, nodes, instances, cinfo) = do
250 group_data <- groups >>= getGroups
251 let (group_names, group_idx) = assignIndices group_data
252 node_data <- nodes >>= getNodes group_names
253 let (node_names, node_idx) = assignIndices node_data
254 inst_data <- instances >>= getInstances node_names
255 let (_, inst_idx) = assignIndices inst_data
256 (ctags, cpol) <- cinfo >>= getClusterData
257 return (ClusterData group_idx node_idx inst_idx ctags cpol)
259 -- | Top level function for data loading.
260 loadData :: String -- ^ Unix socket to use as source
261 -> IO (Result ClusterData)
262 loadData = fmap parseData . readData