-
Iustin Pop authored
This completes the Utils/JSON split started in commit f047f90f. The import graph should be cleaner now. Signed-off-by:
Iustin Pop <iustin@google.com> Reviewed-by:
René Nussbaumer <rn@google.com>
b69be409
Rapi.hs 6.74 KiB
{-| Implementation of the RAPI client interface.
-}
{-
Copyright (C) 2009, 2010, 2011 Google Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.
-}
{-# LANGUAGE BangPatterns, CPP #-}
module Ganeti.HTools.Rapi
( loadData
, parseData
) where
import Data.Maybe (fromMaybe)
#ifndef NO_CURL
import Network.Curl
import Network.Curl.Types ()
#endif
import Control.Monad
import Text.JSON (JSObject, fromJSObject, decodeStrict)
import Text.JSON.Types (JSValue(..))
import Text.Printf (printf)
import Ganeti.HTools.Loader
import Ganeti.HTools.Types
import Ganeti.HTools.JSON
import qualified Ganeti.HTools.Group as Group
import qualified Ganeti.HTools.Node as Node
import qualified Ganeti.HTools.Instance as Instance
import qualified Ganeti.Constants as C
{-# ANN module "HLint: ignore Eta reduce" #-}
-- | Read an URL via curl and return the body if successful.
getUrl :: (Monad m) => String -> IO (m String)
#ifdef NO_CURL
getUrl _ = return $ fail "RAPI/curl backend disabled at compile time"
#else
-- | The curl options we use.
curlOpts :: [CurlOption]
curlOpts = [ CurlSSLVerifyPeer False
, CurlSSLVerifyHost 0
, CurlTimeout (fromIntegral queryTimeout)
, CurlConnectTimeout (fromIntegral connTimeout)
]
getUrl url = do
(code, !body) <- curlGetString url curlOpts
return (case code of
CurlOK -> return body
_ -> fail $ printf "Curl error for '%s', error %s"
url (show code))
#endif
-- | Append the default port if not passed in.
formatHost :: String -> String
formatHost master =
if ':' `elem` master
then master
else "https://" ++ master ++ ":" ++ show C.defaultRapiPort
-- | Parse a instance list in JSON format.
getInstances :: NameAssoc
-> String
-> Result [(String, Instance.Instance)]
getInstances ktn body =
loadJSArray "Parsing instance data" body >>=
mapM (parseInstance ktn . fromJSObject)
-- | Parse a node list in JSON format.
getNodes :: NameAssoc -> String -> Result [(String, Node.Node)]
getNodes ktg body = loadJSArray "Parsing node data" body >>=
mapM (parseNode ktg . fromJSObject)
-- | Parse a group list in JSON format.
getGroups :: String -> Result [(String, Group.Group)]
getGroups body = loadJSArray "Parsing group data" body >>=
mapM (parseGroup . fromJSObject)
-- | Construct an instance from a JSON object.
parseInstance :: NameAssoc
-> JSRecord
-> Result (String, Instance.Instance)
parseInstance ktn a = do
name <- tryFromObj "Parsing new instance" a "name"
let owner_name = "Instance '" ++ name ++ "', error while parsing data"
let extract s x = tryFromObj owner_name x s
disk <- extract "disk_usage" a
beparams <- liftM fromJSObject (extract "beparams" a)
omem <- extract "oper_ram" a
mem <- case omem of
JSRational _ _ -> annotateResult owner_name (fromJVal omem)
_ -> extract "memory" beparams
vcpus <- extract "vcpus" beparams
pnode <- extract "pnode" a >>= lookupNode ktn name
snodes <- extract "snodes" a
snode <- if null snodes
then return Node.noSecondary
else readEitherString (head snodes) >>= lookupNode ktn name
running <- extract "status" a
tags <- extract "tags" a
auto_balance <- extract "auto_balance" beparams
dt <- extract "disk_template" a
let inst = Instance.create name mem disk vcpus running tags
auto_balance pnode snode dt
return (name, inst)
-- | Construct a node from a JSON object.
parseNode :: NameAssoc -> JSRecord -> Result (String, Node.Node)
parseNode ktg a = do
name <- tryFromObj "Parsing new node" a "name"
let desc = "Node '" ++ name ++ "', error while parsing data"
extract s = tryFromObj desc a s
offline <- extract "offline"
drained <- extract "drained"
vm_cap <- annotateResult desc $ maybeFromObj a "vm_capable"
let vm_cap' = fromMaybe True vm_cap
guuid <- annotateResult desc $ maybeFromObj a "group.uuid"
guuid' <- lookupGroup ktg name (fromMaybe defaultGroupID guuid)
node <- if offline || drained || not vm_cap'
then return $ Node.create name 0 0 0 0 0 0 True guuid'
else do
mtotal <- extract "mtotal"
mnode <- extract "mnode"
mfree <- extract "mfree"
dtotal <- extract "dtotal"
dfree <- extract "dfree"
ctotal <- extract "ctotal"
return $ Node.create name mtotal mnode mfree
dtotal dfree ctotal False guuid'
return (name, node)
-- | Construct a group from a JSON object.
parseGroup :: JSRecord -> Result (String, Group.Group)
parseGroup a = do
name <- tryFromObj "Parsing new group" a "name"
let extract s = tryFromObj ("Group '" ++ name ++ "'") a s
uuid <- extract "uuid"
apol <- extract "alloc_policy"
return (uuid, Group.create name uuid apol)
-- | Loads the raw cluster data from an URL.
readData :: String -- ^ Cluster or URL to use as source
-> IO (Result String, Result String, Result String, Result String)
readData master = do
let url = formatHost master
group_body <- getUrl $ printf "%s/2/groups?bulk=1" url
node_body <- getUrl $ printf "%s/2/nodes?bulk=1" url
inst_body <- getUrl $ printf "%s/2/instances?bulk=1" url
tags_body <- getUrl $ printf "%s/2/tags" url
return (group_body, node_body, inst_body, tags_body)
-- | Builds the cluster data from the raw Rapi content.
parseData :: (Result String, Result String, Result String, Result String)
-> Result ClusterData
parseData (group_body, node_body, inst_body, tags_body) = do
group_data <- group_body >>= getGroups
let (group_names, group_idx) = assignIndices group_data
node_data <- node_body >>= getNodes group_names
let (node_names, node_idx) = assignIndices node_data
inst_data <- inst_body >>= getInstances node_names
let (_, inst_idx) = assignIndices inst_data
tags_data <- tags_body >>= (fromJResult "Parsing tags data" . decodeStrict)
return (ClusterData group_idx node_idx inst_idx tags_data)
-- | Top level function for data loading.
loadData :: String -- ^ Cluster or URL to use as source
-> IO (Result ClusterData)
loadData = fmap parseData . readData