1 {-| Implementation of the RAPI client interface.
7 Copyright (C) 2009 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.Rapi
32 import Network.Curl.Types ()
33 import Network.Curl.Code
36 import Text.JSON (JSObject, JSValue)
37 import Text.Printf (printf)
39 import Ganeti.HTools.Utils
40 import Ganeti.HTools.Loader
41 import Ganeti.HTools.Types
42 import qualified Ganeti.HTools.Node as Node
43 import qualified Ganeti.HTools.Instance as Instance
45 -- | Read an URL via curl and return the body if successful.
46 getUrl :: (Monad m) => String -> IO (m String)
48 (code, body) <- curlGetString url [CurlSSLVerifyPeer False,
52 _ -> fail $ printf "Curl error for '%s', error %s"
55 -- | Append the default port if not passed in.
56 formatHost :: String -> String
58 if elem ':' master then master
59 else "https://" ++ master ++ ":5080"
61 -- | Parse a instance list in JSON format.
62 getInstances :: NameAssoc
64 -> Result [(String, Instance.Instance)]
65 getInstances ktn body = do
66 arr <- loadJSArray body
67 ilist <- mapM (parseInstance ktn) arr
70 -- | Parse a node list in JSON format.
71 getNodes :: String -> Result [(String, Node.Node)]
73 arr <- loadJSArray body
74 nlist <- mapM parseNode arr
77 -- | Construct an instance from a JSON object.
78 parseInstance :: [(String, Ndx)]
80 -> Result (String, Instance.Instance)
81 parseInstance ktn a = do
82 name <- fromObj "name" a
83 disk <- fromObj "disk_usage" a
84 mem <- fromObj "beparams" a >>= fromObj "memory"
85 vcpus <- fromObj "beparams" a >>= fromObj "vcpus"
86 pnode <- fromObj "pnode" a >>= lookupNode ktn name
87 snodes <- fromObj "snodes" a
88 snode <- (if null snodes then return Node.noSecondary
89 else readEitherString (head snodes) >>= lookupNode ktn name)
90 running <- fromObj "status" a
91 let inst = Instance.create name mem disk vcpus running pnode snode
94 -- | Construct a node from a JSON object.
95 parseNode :: JSObject JSValue -> Result (String, Node.Node)
97 name <- fromObj "name" a
98 offline <- fromObj "offline" a
99 node <- (case offline of
100 True -> return $ Node.create name 0 0 0 0 0 0 True
102 drained <- fromObj "drained" a
103 mtotal <- fromObj "mtotal" a
104 mnode <- fromObj "mnode" a
105 mfree <- fromObj "mfree" a
106 dtotal <- fromObj "dtotal" a
107 dfree <- fromObj "dfree" a
108 ctotal <- fromObj "ctotal" a
109 return $ Node.create name mtotal mnode mfree
110 dtotal dfree ctotal (offline || drained))
113 -- | Builds the cluster data from an URL.
114 loadData :: String -- ^ Cluster or URL to use as source
115 -> IO (Result (Node.AssocList, Instance.AssocList))
116 loadData master = do -- IO monad
117 let url = formatHost master
118 node_body <- getUrl $ printf "%s/2/nodes?bulk=1" url
119 inst_body <- getUrl $ printf "%s/2/instances?bulk=1" url
120 return $ do -- Result monad
121 node_data <- node_body >>= getNodes
122 let (node_names, node_idx) = assignIndices node_data
123 inst_data <- inst_body >>= getInstances node_names
124 let (_, inst_idx) = assignIndices inst_data
125 return (node_idx, inst_idx)