1 {-| Implementation of the RAPI client interface.
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 {-# LANGUAGE BangPatterns, CPP #-}
28 module Ganeti.HTools.Rapi
34 import Data.Maybe (fromMaybe)
37 import Network.Curl.Types ()
40 import Text.JSON (JSObject, fromJSObject, decodeStrict)
41 import Text.JSON.Types (JSValue(..))
42 import Text.Printf (printf)
44 import Ganeti.HTools.Utils
45 import Ganeti.HTools.Loader
46 import Ganeti.HTools.Types
47 import qualified Ganeti.HTools.Group as Group
48 import qualified Ganeti.HTools.Node as Node
49 import qualified Ganeti.HTools.Instance as Instance
50 import qualified Ganeti.Constants as C
52 -- | Read an URL via curl and return the body if successful.
53 getUrl :: (Monad m) => String -> IO (m String)
56 getUrl _ = return $ fail "RAPI/curl backend disabled at compile time"
60 -- | The curl options we use.
61 curlOpts :: [CurlOption]
62 curlOpts = [ CurlSSLVerifyPeer False
64 , CurlTimeout (fromIntegral queryTimeout)
65 , CurlConnectTimeout (fromIntegral connTimeout)
69 (code, !body) <- curlGetString url curlOpts
72 _ -> fail $ printf "Curl error for '%s', error %s"
76 -- | Append the default port if not passed in.
77 formatHost :: String -> String
79 if ':' `elem` master then master
80 else "https://" ++ master ++ ":" ++ show C.defaultRapiPort
82 -- | Parse a instance list in JSON format.
83 getInstances :: NameAssoc
85 -> Result [(String, Instance.Instance)]
86 getInstances ktn body =
87 loadJSArray "Parsing instance data" body >>=
88 mapM (parseInstance ktn . fromJSObject)
90 -- | Parse a node list in JSON format.
91 getNodes :: NameAssoc -> String -> Result [(String, Node.Node)]
92 getNodes ktg body = loadJSArray "Parsing node data" body >>=
93 mapM (parseNode ktg . fromJSObject)
95 -- | Parse a group list in JSON format.
96 getGroups :: String -> Result [(String, Group.Group)]
97 getGroups body = loadJSArray "Parsing group data" body >>=
98 mapM (parseGroup . fromJSObject)
100 -- | Construct an instance from a JSON object.
101 parseInstance :: NameAssoc
103 -> Result (String, Instance.Instance)
104 parseInstance ktn a = do
105 name <- tryFromObj "Parsing new instance" a "name"
106 let owner_name = "Instance '" ++ name ++ "', error while parsing data"
107 let extract s x = tryFromObj owner_name x s
108 disk <- extract "disk_usage" a
109 beparams <- liftM fromJSObject (extract "beparams" a)
110 omem <- extract "oper_ram" a
112 JSRational _ _ -> annotateResult owner_name (fromJVal omem)
113 _ -> extract "memory" beparams)
114 vcpus <- extract "vcpus" beparams
115 pnode <- extract "pnode" a >>= lookupNode ktn name
116 snodes <- extract "snodes" a
117 snode <- (if null snodes then return Node.noSecondary
118 else readEitherString (head snodes) >>= lookupNode ktn name)
119 running <- extract "status" a
120 tags <- extract "tags" a
121 auto_balance <- extract "auto_balance" beparams
122 dt <- extract "disk_template" a
123 let inst = Instance.create name mem disk vcpus running tags
124 auto_balance pnode snode dt
127 -- | Construct a node from a JSON object.
128 parseNode :: NameAssoc -> JSRecord -> Result (String, Node.Node)
130 name <- tryFromObj "Parsing new node" a "name"
131 let desc = "Node '" ++ name ++ "', error while parsing data"
132 extract s = tryFromObj desc a s
133 offline <- extract "offline"
134 drained <- extract "drained"
135 vm_cap <- annotateResult desc $ maybeFromObj a "vm_capable"
136 let vm_cap' = fromMaybe True vm_cap
137 guuid <- annotateResult desc $ maybeFromObj a "group.uuid"
138 guuid' <- lookupGroup ktg name (fromMaybe defaultGroupID guuid)
139 node <- (if offline || drained || not vm_cap'
140 then return $ Node.create name 0 0 0 0 0 0 True guuid'
142 mtotal <- extract "mtotal"
143 mnode <- extract "mnode"
144 mfree <- extract "mfree"
145 dtotal <- extract "dtotal"
146 dfree <- extract "dfree"
147 ctotal <- extract "ctotal"
148 return $ Node.create name mtotal mnode mfree
149 dtotal dfree ctotal False guuid')
152 -- | Construct a group from a JSON object.
153 parseGroup :: JSRecord -> Result (String, Group.Group)
155 name <- tryFromObj "Parsing new group" a "name"
156 let extract s = tryFromObj ("Group '" ++ name ++ "'") a s
157 uuid <- extract "uuid"
158 apol <- extract "alloc_policy"
159 return (uuid, Group.create name uuid apol)
161 -- | Loads the raw cluster data from an URL.
162 readData :: String -- ^ Cluster or URL to use as source
163 -> IO (Result String, Result String, Result String, Result String)
165 let url = formatHost master
166 group_body <- getUrl $ printf "%s/2/groups?bulk=1" url
167 node_body <- getUrl $ printf "%s/2/nodes?bulk=1" url
168 inst_body <- getUrl $ printf "%s/2/instances?bulk=1" url
169 tags_body <- getUrl $ printf "%s/2/tags" url
170 return (group_body, node_body, inst_body, tags_body)
172 -- | Builds the cluster data from the raw Rapi content.
173 parseData :: (Result String, Result String, Result String, Result String)
174 -> Result ClusterData
175 parseData (group_body, node_body, inst_body, tags_body) = do
176 group_data <- group_body >>= getGroups
177 let (group_names, group_idx) = assignIndices group_data
178 node_data <- node_body >>= getNodes group_names
179 let (node_names, node_idx) = assignIndices node_data
180 inst_data <- inst_body >>= getInstances node_names
181 let (_, inst_idx) = assignIndices inst_data
182 tags_data <- tags_body >>= (fromJResult "Parsing tags data" . decodeStrict)
183 return (ClusterData group_idx node_idx inst_idx tags_data)
185 -- | Top level function for data loading.
186 loadData :: String -- ^ Cluster or URL to use as source
187 -> IO (Result ClusterData)
188 loadData = fmap parseData . readData