-}
+{-
+
+Copyright (C) 2009 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.
+
+-}
+
module Ganeti.HTools.IAlloc
- (
- parseData
+ ( parseData
, formatResponse
) where
import Data.Either ()
---import Data.Maybe
import Control.Monad
import Text.JSON (JSObject, JSValue(JSBool, JSString, JSArray),
makeObj, encodeStrict, decodeStrict,
fromJSObject, toJSString)
---import Text.Printf (printf)
+import qualified Ganeti.HTools.Container as Container
import qualified Ganeti.HTools.Node as Node
import qualified Ganeti.HTools.Instance as Instance
import Ganeti.HTools.Loader
import Ganeti.HTools.Utils
import Ganeti.HTools.Types
-data RqType
- = Allocate String Instance.Instance
- | Relocate Int
- deriving (Show)
-
-data Request = Request RqType IdxNode IdxInstance NameList NameList
- deriving (Show)
-
+-- | Parse the basic specifications of an instance.
+--
+-- Instances in the cluster instance list and the instance in an
+-- 'Allocate' request share some common properties, which are read by
+-- this function.
parseBaseInstance :: String
- -> JSObject JSValue
+ -> [(String, JSValue)]
-> Result (String, Instance.Instance)
parseBaseInstance n a = do
- disk <- case fromObj "disk_usage" a of
- Bad _ -> do
- all_d <- fromObj "disks" a >>= asObjectList
- szd <- mapM (fromObj "size") all_d
- let sze = map (+128) szd
- szf = (sum sze)::Int
- return szf
- x@(Ok _) -> x
+ disk <- fromObj "disk_space_total" a
mem <- fromObj "memory" a
+ vcpus <- fromObj "vcpus" a
+ tags <- fromObj "tags" a
let running = "running"
- return $ (n, Instance.create n mem disk running 0 0)
+ return (n, Instance.create n mem disk vcpus running tags 0 0)
-parseInstance :: NameAssoc
- -> String
- -> JSObject JSValue
+-- | Parses an instance as found in the cluster instance listg.
+parseInstance :: NameAssoc -- ^ The node name-to-index association list
+ -> String -- ^ The name of the instance
+ -> [(String, JSValue)] -- ^ The JSON object
-> Result (String, Instance.Instance)
parseInstance ktn n a = do
- base <- parseBaseInstance n a
- nodes <- fromObj "nodes" a
- pnode <- readEitherString $ head nodes
- snode <- readEitherString $ (head . tail) nodes
- pidx <- lookupNode ktn n pnode
- sidx <- lookupNode ktn n snode
- return (n, Instance.setBoth (snd base) pidx sidx)
-
-parseNode :: String -> JSObject JSValue -> Result (String, Node.Node)
+ base <- parseBaseInstance n a
+ nodes <- fromObj "nodes" a
+ pnode <- if null nodes
+ then Bad $ "empty node list for instance " ++ n
+ else readEitherString $ head nodes
+ pidx <- lookupNode ktn n pnode
+ let snodes = tail nodes
+ sidx <- (if null snodes then return Node.noSecondary
+ else readEitherString (head snodes) >>= lookupNode ktn n)
+ return (n, Instance.setBoth (snd base) pidx sidx)
+
+-- | Parses a node as found in the cluster node list.
+parseNode :: String -- ^ The node's name
+ -> [(String, JSValue)] -- ^ The JSON object
+ -> Result (String, Node.Node)
parseNode n a = do
- let name = n
- mtotal <- fromObj "total_memory" a
- mnode <- fromObj "reserved_memory" a
- mfree <- fromObj "free_memory" a
- dtotal <- fromObj "total_disk" a
- dfree <- fromObj "free_disk" a
- offline <- fromObj "offline" a
- drained <- fromObj "offline" a
- return $ (name, Node.create n mtotal mnode mfree dtotal dfree
- (offline || drained))
-
-parseData :: String -> Result Request
+ offline <- fromObj "offline" a
+ drained <- fromObj "drained" a
+ node <- (if offline || drained
+ then return $ Node.create n 0 0 0 0 0 0 True
+ else do
+ mtotal <- fromObj "total_memory" a
+ mnode <- fromObj "reserved_memory" a
+ mfree <- fromObj "free_memory" a
+ dtotal <- fromObj "total_disk" a
+ dfree <- fromObj "free_disk" a
+ ctotal <- fromObj "total_cpus" a
+ return $ Node.create n mtotal mnode mfree
+ dtotal dfree ctotal False)
+ return (n, node)
+
+-- | Top-level parser.
+parseData :: String -- ^ The JSON message as received from Ganeti
+ -> Result Request -- ^ A (possible valid) request
parseData body = do
decoded <- fromJResult $ decodeStrict body
- let obj = decoded
+ let obj = fromJSObject decoded
-- request parser
- request <- fromObj "request" obj
- rname <- fromObj "name" request
+ request <- liftM fromJSObject (fromObj "request" obj)
-- existing node parsing
- nlist <- fromObj "nodes" obj
- let ndata = fromJSObject nlist
- nobj <- (mapM (\(x,y) -> asJSObject y >>= parseNode x)) ndata
- let (ktn, nl) = assignIndices Node.setIdx nobj
+ nlist <- liftM fromJSObject (fromObj "nodes" obj)
+ nobj <- mapM (\(x,y) -> asJSObject y >>= parseNode x . fromJSObject) nlist
+ let (ktn, nl) = assignIndices nobj
-- existing instance parsing
ilist <- fromObj "instances" obj
let idata = fromJSObject ilist
- iobj <- (mapM (\(x,y) -> asJSObject y >>= parseInstance ktn x)) idata
- let (kti, il) = assignIndices Instance.setIdx iobj
+ iobj <- mapM (\(x,y) ->
+ asJSObject y >>= parseInstance ktn x . fromJSObject) idata
+ let (kti, il) = assignIndices iobj
+ -- cluster tags
+ ctags <- fromObj "cluster_tags" obj
+ (map_n, map_i, ptags, csf) <- mergeData [] [] [] (nl, il, ctags)
optype <- fromObj "type" request
rqtype <-
case optype of
"allocate" ->
do
+ rname <- fromObj "name" request
+ req_nodes <- fromObj "required_nodes" request
inew <- parseBaseInstance rname request
- let (iname, io) = inew
- return $ Allocate iname io
+ let io = snd inew
+ return $ Allocate io req_nodes
"relocate" ->
do
- ridx <- lookupNode kti rname rname
- return $ Relocate ridx
- other -> fail $ ("Invalid request type '" ++ other ++ "'")
+ rname <- fromObj "name" request
+ ridx <- lookupInstance kti rname
+ req_nodes <- fromObj "required_nodes" request
+ ex_nodes <- fromObj "relocate_from" request
+ let ex_nodes' = map (stripSuffix $ length csf) ex_nodes
+ ex_idex <- mapM (Container.findByName map_n) ex_nodes'
+ return $ Relocate ridx req_nodes (map Node.idx ex_idex)
+ "multi-evacuate" ->
+ do
+ ex_names <- fromObj "evac_nodes" request
+ let ex_names' = map (stripSuffix $ length csf) ex_names
+ ex_nodes <- mapM (Container.findByName map_n) ex_names'
+ let ex_ndx = map Node.idx ex_nodes
+ return $ Evacuate ex_ndx
+ other -> fail ("Invalid request type '" ++ other ++ "'")
+ return $ Request rqtype map_n map_i ptags csf
+
+-- | Format the result
+formatRVal :: String -> RqType -> [Node.AllocElement] -> JSValue
+formatRVal _ _ [] = JSArray []
+
+formatRVal csf (Evacuate _) elems =
+ let sols = map (\(_, inst, nl) ->
+ let names = Instance.name inst : map Node.name nl
+ in map (++ csf) names) elems
+ jsols = map (JSArray . map (JSString . toJSString)) sols
+ in JSArray jsols
- return $ Request rqtype nl il (swapPairs ktn) (swapPairs kti)
+formatRVal csf _ elems =
+ let (_, _, nodes) = head elems
+ nodes' = map ((++ csf) . Node.name) nodes
+ in JSArray $ map (JSString . toJSString) nodes'
-formatResponse :: Bool -> String -> [String] -> String
-formatResponse success info nodes =
+-- | Formats the response into a valid IAllocator response message.
+formatResponse :: Bool -- ^ Whether the request was successful
+ -> String -- ^ Information text
+ -> String -- ^ Suffix for nodes and instances
+ -> RqType -- ^ Request type
+ -> [Node.AllocElement] -- ^ The resulting allocations
+ -> String -- ^ The JSON-formatted message
+formatResponse success info csf rq elems =
let
e_success = ("success", JSBool success)
e_info = ("info", JSString . toJSString $ info)
- e_nodes = ("nodes", JSArray $ map (JSString . toJSString) nodes)
+ e_nodes = ("nodes", formatRVal csf rq elems)
in encodeStrict $ makeObj [e_success, e_info, e_nodes]
projects / ganeti-local / blobdiff