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 = loadJSArray body >>= mapM (parseInstance ktn)
67 -- | Parse a node list in JSON format.
68 getNodes :: String -> Result [(String, Node.Node)]
69 getNodes body = loadJSArray body >>= mapM parseNode
71 -- | Construct an instance from a JSON object.
72 parseInstance :: [(String, Ndx)]
74 -> Result (String, Instance.Instance)
75 parseInstance ktn a = do
76 name <- fromObj "name" a
77 disk <- fromObj "disk_usage" a
78 mem <- fromObj "beparams" a >>= fromObj "memory"
79 vcpus <- fromObj "beparams" a >>= fromObj "vcpus"
80 pnode <- fromObj "pnode" a >>= lookupNode ktn name
81 snodes <- fromObj "snodes" a
82 snode <- (if null snodes then return Node.noSecondary
83 else readEitherString (head snodes) >>= lookupNode ktn name)
84 running <- fromObj "status" a
85 let inst = Instance.create name mem disk vcpus running pnode snode
88 -- | Construct a node from a JSON object.
89 parseNode :: JSObject JSValue -> Result (String, Node.Node)
91 name <- fromObj "name" a
92 offline <- fromObj "offline" a
94 then return $ Node.create name 0 0 0 0 0 0 True
96 drained <- fromObj "drained" a
97 mtotal <- fromObj "mtotal" a
98 mnode <- fromObj "mnode" a
99 mfree <- fromObj "mfree" a
100 dtotal <- fromObj "dtotal" a
101 dfree <- fromObj "dfree" a
102 ctotal <- fromObj "ctotal" a
103 return $ Node.create name mtotal mnode mfree
104 dtotal dfree ctotal (offline || drained))
107 -- | Builds the cluster data from an URL.
108 loadData :: String -- ^ Cluster or URL to use as source
109 -> IO (Result (Node.AssocList, Instance.AssocList))
110 loadData master = do -- IO monad
111 let url = formatHost master
112 node_body <- getUrl $ printf "%s/2/nodes?bulk=1" url
113 inst_body <- getUrl $ printf "%s/2/instances?bulk=1" url
114 return $ do -- Result monad
115 node_data <- node_body >>= getNodes
116 let (node_names, node_idx) = assignIndices node_data
117 inst_data <- inst_body >>= getInstances node_names
118 let (_, inst_idx) = assignIndices inst_data
119 return (node_idx, inst_idx)