root / Ganeti / HTools / Rapi.hs @ a334d536
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{-| Implementation of the RAPI client interface. |
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-} |
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{- |
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Copyright (C) 2009, 2010 Google Inc. |
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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|
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This program is distributed in the hope that it will be useful, but |
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WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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02110-1301, USA. |
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-} |
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module Ganeti.HTools.Rapi |
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( |
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loadData |
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, parseData |
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) where |
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import Network.Curl |
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import Network.Curl.Types () |
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import Control.Monad |
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import Text.JSON (JSObject, JSValue, fromJSObject, decodeStrict) |
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import Text.JSON.Types (JSValue(..)) |
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import Text.Printf (printf) |
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import Ganeti.HTools.Utils |
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import Ganeti.HTools.Loader |
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import Ganeti.HTools.Types |
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import qualified Ganeti.HTools.Node as Node |
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import qualified Ganeti.HTools.Instance as Instance |
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-- | Read an URL via curl and return the body if successful. |
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getUrl :: (Monad m) => String -> IO (m String) |
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getUrl url = do |
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(code, body) <- curlGetString url [CurlSSLVerifyPeer False, |
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CurlSSLVerifyHost 0, |
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CurlTimeout (fromIntegral queryTimeout), |
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CurlConnectTimeout |
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(fromIntegral connTimeout)] |
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return (case code of |
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CurlOK -> return body |
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_ -> fail $ printf "Curl error for '%s', error %s" |
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url (show code)) |
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-- | Append the default port if not passed in. |
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formatHost :: String -> String |
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formatHost master = |
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if ':' `elem` master then master |
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else "https://" ++ master ++ ":5080" |
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-- | Parse a instance list in JSON format. |
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getInstances :: NameAssoc |
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-> String |
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-> Result [(String, Instance.Instance)] |
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getInstances ktn body = |
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loadJSArray "Parsing instance data" body >>= |
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mapM (parseInstance ktn . fromJSObject) |
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-- | Parse a node list in JSON format. |
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getNodes :: String -> Result [(String, Node.Node)] |
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getNodes body = loadJSArray "Parsing node data" body >>= |
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mapM (parseNode . fromJSObject) |
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-- | Construct an instance from a JSON object. |
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parseInstance :: NameAssoc |
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-> [(String, JSValue)] |
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-> Result (String, Instance.Instance) |
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parseInstance ktn a = do |
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name <- tryFromObj "Parsing new instance" a "name" |
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let owner_name = "Instance '" ++ name ++ "'" |
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let extract s x = tryFromObj owner_name x s |
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disk <- extract "disk_usage" a |
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beparams <- liftM fromJSObject (extract "beparams" a) |
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omem <- extract "oper_ram" a |
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mem <- (case omem of |
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JSRational _ _ -> annotateResult owner_name (fromJVal omem) |
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_ -> extract "memory" beparams) |
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vcpus <- extract "vcpus" beparams |
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pnode <- extract "pnode" a >>= lookupNode ktn name |
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snodes <- extract "snodes" a |
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snode <- (if null snodes then return Node.noSecondary |
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else readEitherString (head snodes) >>= lookupNode ktn name) |
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running <- extract "status" a |
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tags <- extract "tags" a |
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let inst = Instance.create name mem disk vcpus running tags pnode snode |
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return (name, inst) |
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-- | Construct a node from a JSON object. |
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parseNode :: [(String, JSValue)] -> Result (String, Node.Node) |
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parseNode a = do |
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name <- tryFromObj "Parsing new node" a "name" |
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let extract s = tryFromObj ("Node '" ++ name ++ "'") a s |
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offline <- extract "offline" |
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drained <- extract "drained" |
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guuid <- extract "group.uuid" |
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node <- (if offline || drained |
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then return $ Node.create name 0 0 0 0 0 0 True guuid |
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else do |
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mtotal <- extract "mtotal" |
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mnode <- extract "mnode" |
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mfree <- extract "mfree" |
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dtotal <- extract "dtotal" |
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dfree <- extract "dfree" |
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ctotal <- extract "ctotal" |
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return $ Node.create name mtotal mnode mfree |
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dtotal dfree ctotal False guuid) |
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return (name, node) |
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-- | Loads the raw cluster data from an URL. |
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readData :: String -- ^ Cluster or URL to use as source |
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-> IO (Result String, Result String, Result String) |
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readData master = do |
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let url = formatHost master |
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node_body <- getUrl $ printf "%s/2/nodes?bulk=1" url |
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inst_body <- getUrl $ printf "%s/2/instances?bulk=1" url |
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tags_body <- getUrl $ printf "%s/2/tags" url |
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return (node_body, inst_body, tags_body) |
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-- | Builds the cluster data from the raw Rapi content |
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parseData :: (Result String, Result String, Result String) |
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-> Result (Node.List, Instance.List, [String]) |
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parseData (node_body, inst_body, tags_body) = do |
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node_data <- node_body >>= getNodes |
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let (node_names, node_idx) = assignIndices node_data |
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inst_data <- inst_body >>= getInstances node_names |
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let (_, inst_idx) = assignIndices inst_data |
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tags_data <- tags_body >>= (fromJResult "Parsing tags data" . decodeStrict) |
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return (node_idx, inst_idx, tags_data) |
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-- | Top level function for data loading |
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loadData :: String -- ^ Cluster or URL to use as source |
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-> IO (Result (Node.List, Instance.List, [String])) |
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loadData master = readData master >>= return . parseData |