-}
+{-
+
+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 Ganeti.HTools.Utils
+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
+
+-- | 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
+ -> [(String, JSValue)]
+ -> Result (String, Instance.Instance)
+parseBaseInstance n a = do
+ 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 vcpus running tags 0 0)
+
+-- | 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
+ 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
+ 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 = fromJSObject decoded
+ -- request parser
+ request <- liftM fromJSObject (fromObj "request" obj)
+ -- existing node parsing
+ 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 . 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 io = snd inew
+ return $ Allocate io req_nodes
+ "relocate" ->
+ do
+ 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
+ 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
+
+formatRVal :: String -> RqType
+ -> [Node.AllocElement] -> JSValue
+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
+
+formatRVal csf _ elems =
+ let (_, _, nodes) = head elems
+ nodes' = map ((++ csf) . Node.name) nodes
+ in JSArray $ map (JSString . toJSString) nodes'
+
-data RqType
- = Allocate
- | Relocate
- deriving (Eq, Show)
-
-data Request
- = RqAlloc String String String
- | RqReloc String String String
-
-parseInstance :: String -> JSObject JSValue -> Result String
-parseInstance n a =
- let name = Ok n
- disk = case getIntElement "disk_usage" a of
- Bad _ -> let all_d = getListElement "disks" a >>= asObjectList
- szd = all_d >>=
- (sequence .
- map (getIntElement "size"))
- sze = liftM (map (+128)) szd
- szf = liftM sum sze
- in szf
- x@(Ok _) -> x
- nodes = getListElement "nodes" a
- pnode = liftM head nodes >>= readEitherString
- snode = liftM (head . tail) nodes >>= readEitherString
- mem = getIntElement "memory" a
- running = Ok "running" --getStringElement "status" a
- in
- name |+ (show `liftM` mem) |+
- (show `liftM` disk) |+ running |+ pnode |+ snode
-
-parseNode :: String -> JSObject JSValue -> Result String
-parseNode n a =
- let name = Ok n
- mtotal = getIntElement "total_memory" a
- mnode = getIntElement "reserved_memory" a
- mfree = getIntElement "free_memory" a
- dtotal = getIntElement "total_disk" a
- dfree = getIntElement "free_disk" a
- in name |+ (show `liftM` mtotal) |+
- (show `liftM` mnode) |+
- (show `liftM` mfree) |+
- (show `liftM` dtotal) |+
- (show `liftM` dfree)
-
-validateRequest :: String -> Result RqType
-validateRequest rq =
- case rq of
- "allocate" -> Ok Allocate
- "relocate" -> Ok Relocate
- _ -> Bad ("Invalid request type '" ++ rq ++ "'")
-
-parseData :: String -> Result Request
-parseData body =
- do
- decoded <- fromJResult $ decodeStrict body
- let obj = decoded -- decoded `combineEithers` fromJSObject
- -- request parser
- request <- getObjectElement "request" obj
- rname <- getStringElement "name" request
- rtype <- getStringElement "type" request >>= validateRequest
- inew <- (\x -> if x == Allocate then parseInstance rname request
- else Ok "") rtype
- -- existing intstance parsing
- ilist <- getObjectElement "instances" obj
- let idata = fromJSObject ilist
- iobj <- (sequence . map (\(x,y) -> asJSObject y >>= parseInstance x))
- idata
- let ilines = unlines iobj
- -- existing node parsing
- nlist <- getObjectElement "nodes" obj
- let ndata = fromJSObject nlist
- nobj <- (sequence . map (\(x,y) -> asJSObject y >>= parseNode x))
- ndata
- let nlines = unlines nobj
- return $ (\ r nl il inew rnam ->
- case r of
- Allocate -> RqAlloc inew nl il
- Relocate -> RqReloc rnam nl il)
- rtype nlines ilines inew rname
-
-
-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/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