{-
-Copyright (C) 2009 Google Inc.
+Copyright (C) 2009, 2010 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
module Ganeti.HTools.Rapi
(
loadData
+ , parseData
) where
import Network.Curl
import Network.Curl.Types ()
-import Network.Curl.Code
-import Data.List
import Control.Monad
-import Text.JSON (JSObject, JSValue)
+import Text.JSON (JSObject, JSValue, fromJSObject, decodeStrict)
+import Text.JSON.Types (JSValue(..))
import Text.Printf (printf)
import Ganeti.HTools.Utils
import Ganeti.HTools.Loader
import Ganeti.HTools.Types
+import qualified Ganeti.HTools.Group as Group
import qualified Ganeti.HTools.Node as Node
import qualified Ganeti.HTools.Instance as Instance
-- | Append the default port if not passed in.
formatHost :: String -> String
formatHost master =
- if elem ':' master then master
+ if ':' `elem` master then master
else "https://" ++ master ++ ":5080"
-- | Parse a instance list in JSON format.
getInstances :: NameAssoc
-> String
-> Result [(String, Instance.Instance)]
-getInstances ktn body = loadJSArray body >>= mapM (parseInstance ktn)
+getInstances ktn body =
+ loadJSArray "Parsing instance data" body >>=
+ mapM (parseInstance ktn . fromJSObject)
-- | Parse a node list in JSON format.
-getNodes :: String -> Result [(String, Node.Node)]
-getNodes body = loadJSArray body >>= mapM parseNode
+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 :: [(String, Ndx)]
- -> JSObject JSValue
+parseInstance :: NameAssoc
+ -> [(String, JSValue)]
-> Result (String, Instance.Instance)
parseInstance ktn a = do
- name <- fromObj "name" a
- disk <- fromObj "disk_usage" a
- mem <- fromObj "beparams" a >>= fromObj "memory"
- vcpus <- fromObj "beparams" a >>= fromObj "vcpus"
- pnode <- fromObj "pnode" a >>= lookupNode ktn name
- snodes <- fromObj "snodes" a
+ name <- tryFromObj "Parsing new instance" a "name"
+ let owner_name = "Instance '" ++ name ++ "'"
+ 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 <- fromObj "status" a
- let inst = Instance.create name mem disk vcpus running pnode snode
+ running <- extract "status" a
+ tags <- extract "tags" a
+ let inst = Instance.create name mem disk vcpus running tags pnode snode
return (name, inst)
-- | Construct a node from a JSON object.
-parseNode :: JSObject JSValue -> Result (String, Node.Node)
-parseNode a = do
- name <- fromObj "name" a
- offline <- fromObj "offline" a
- node <- (if offline
- then return $ Node.create name 0 0 0 0 0 0 True
- else do
- drained <- fromObj "drained" a
- mtotal <- fromObj "mtotal" a
- mnode <- fromObj "mnode" a
- mfree <- fromObj "mfree" a
- dtotal <- fromObj "dtotal" a
- dfree <- fromObj "dfree" a
- ctotal <- fromObj "ctotal" a
- return $ Node.create name mtotal mnode mfree
- dtotal dfree ctotal (offline || drained))
- return (name, node)
-
--- | Builds the cluster data from an URL.
-loadData :: String -- ^ Cluster or URL to use as source
- -> IO (Result (Node.AssocList, Instance.AssocList))
-loadData master = do -- IO monad
+parseNode :: NameAssoc -> [(String, JSValue)] -> Result (String, Node.Node)
+parseNode ktg a = do
+ name <- tryFromObj "Parsing new node" a "name"
+ let extract s = tryFromObj ("Node '" ++ name ++ "'") a s
+ offline <- extract "offline"
+ drained <- extract "drained"
+ guuid <- extract "group.uuid" >>= lookupGroup ktg name
+ node <- (if offline || drained
+ 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 :: [(String, JSValue)] -> 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
- return $ do -- Result monad
- node_data <- node_body >>= getNodes
- let (node_names, node_idx) = assignIndices node_data
- inst_data <- inst_body >>= getInstances node_names
- let (_, inst_idx) = assignIndices inst_data
- return (node_idx, inst_idx)
+ 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 master = readData master >>= return . parseData