{-
-Copyright (C) 2009, 2010, 2011 Google Inc.
+Copyright (C) 2009, 2010, 2011, 2012 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.IAlloc
- ( parseData
- , formatResponse
- ) where
+ ( readRequest
+ , runIAllocator
+ , processRelocate
+ , loadData
+ ) where
import Data.Either ()
import Data.Maybe (fromMaybe)
+import Data.List
import Control.Monad
-import Text.JSON (JSObject, JSValue(JSBool, JSString, JSArray),
- makeObj, encodeStrict, decodeStrict,
- fromJSObject, toJSString)
+import Text.JSON (JSObject, JSValue(JSArray),
+ makeObj, encodeStrict, decodeStrict, fromJSObject, showJSON)
+import System.Exit
+import System.IO
+
+import qualified Ganeti.HTools.Cluster as Cluster
import qualified Ganeti.HTools.Container as Container
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
+import Ganeti.HTools.CLI
import Ganeti.HTools.Loader
-import Ganeti.HTools.Utils
+import Ganeti.HTools.JSON
import Ganeti.HTools.Types
+{-# ANN module "HLint: ignore Eta reduce" #-}
+
+-- | Type alias for the result of an IAllocator call.
+type IAllocResult = (String, JSValue, Node.List, Instance.List)
+
-- | 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)]
+ -> JSRecord
-> Result (String, Instance.Instance)
parseBaseInstance n a = do
let extract x = tryFromObj ("invalid data for instance '" ++ n ++ "'") a x
mem <- extract "memory"
vcpus <- extract "vcpus"
tags <- extract "tags"
- let running = "running"
- return (n, Instance.create n mem disk vcpus running tags True 0 0)
+ dt <- extract "disk_template"
+ su <- extract "spindle_use"
+ return (n, Instance.create n mem disk vcpus Running tags True 0 0 dt su)
--- | 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
+-- | Parses an instance as found in the cluster instance list.
+parseInstance :: NameAssoc -- ^ The node name-to-index association list
+ -> String -- ^ The name of the instance
+ -> JSRecord -- ^ The JSON object
-> Result (String, Instance.Instance)
parseInstance ktn n a = do
base <- parseBaseInstance n a
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)
+ 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 :: NameAssoc -- ^ The group association
- -> String -- ^ The node's name
- -> [(String, JSValue)] -- ^ The JSON object
+parseNode :: NameAssoc -- ^ The group association
+ -> String -- ^ The node's name
+ -> JSRecord -- ^ The JSON object
-> Result (String, Node.Node)
parseNode ktg n a = do
let desc = "invalid data for node '" ++ n ++ "'"
vm_capable <- annotateResult desc $ maybeFromObj a "vm_capable"
let vm_capable' = fromMaybe True vm_capable
gidx <- lookupGroup ktg n guuid
- node <- (if offline || drained || not vm_capable'
- then return $ Node.create n 0 0 0 0 0 0 True gidx
- else do
- mtotal <- extract "total_memory"
- mnode <- extract "reserved_memory"
- mfree <- extract "free_memory"
- dtotal <- extract "total_disk"
- dfree <- extract "free_disk"
- ctotal <- extract "total_cpus"
- return $ Node.create n mtotal mnode mfree
- dtotal dfree ctotal False gidx)
+ node <- if offline || drained || not vm_capable'
+ then return $ Node.create n 0 0 0 0 0 0 True 0 gidx
+ else do
+ mtotal <- extract "total_memory"
+ mnode <- extract "reserved_memory"
+ mfree <- extract "free_memory"
+ dtotal <- extract "total_disk"
+ dfree <- extract "free_disk"
+ ctotal <- extract "total_cpus"
+ ndparams <- extract "ndparams" >>= asJSObject
+ spindles <- tryFromObj desc (fromJSObject ndparams)
+ "spindle_count"
+ return $ Node.create n mtotal mnode mfree
+ dtotal dfree ctotal False spindles gidx
return (n, node)
-- | Parses a group as found in the cluster group list.
-parseGroup :: String -- ^ The group UUID
- -> [(String, JSValue)] -- ^ The JSON object
+parseGroup :: String -- ^ The group UUID
+ -> JSRecord -- ^ The JSON object
-> Result (String, Group.Group)
parseGroup u a = do
let extract x = tryFromObj ("invalid data for group '" ++ u ++ "'") a x
name <- extract "name"
apol <- extract "alloc_policy"
- return (u, Group.create name u apol)
+ ipol <- extract "ipolicy"
+ return (u, Group.create name u apol ipol)
-- | Top-level parser.
-parseData :: String -- ^ The JSON message as received from Ganeti
- -> Result Request -- ^ A (possible valid) request
+--
+-- The result is a tuple of eventual warning messages and the parsed
+-- request; if parsing the input data fails, we'll return a 'Bad'
+-- value.
+parseData :: String -- ^ The JSON message as received from Ganeti
+ -> Result ([String], Request) -- ^ Result tuple
parseData body = do
decoded <- fromJResult "Parsing input IAllocator message" (decodeStrict body)
let obj = fromJSObject decoded
let (kti, il) = assignIndices iobj
-- cluster tags
ctags <- extrObj "cluster_tags"
- cdata <- mergeData [] [] [] (ClusterData gl nl il ctags)
- let map_n = cdNodes cdata
+ cdata1 <- mergeData [] [] [] [] (ClusterData gl nl il ctags defIPolicy)
+ let (msgs, fix_nl) = checkData (cdNodes cdata1) (cdInstances cdata1)
+ cdata = cdata1 { cdNodes = fix_nl }
+ map_n = cdNodes cdata
+ map_i = cdInstances cdata
+ map_g = cdGroups cdata
optype <- extrReq "type"
rqtype <-
- case optype of
- "allocate" ->
+ case () of
+ _ | optype == C.iallocatorModeAlloc ->
do
rname <- extrReq "name"
req_nodes <- extrReq "required_nodes"
inew <- parseBaseInstance rname request
let io = snd inew
return $ Allocate io req_nodes
- "relocate" ->
+ | optype == C.iallocatorModeReloc ->
do
rname <- extrReq "name"
ridx <- lookupInstance kti rname
ex_nodes <- extrReq "relocate_from"
ex_idex <- mapM (Container.findByName map_n) ex_nodes
return $ Relocate ridx req_nodes (map Node.idx ex_idex)
- "multi-evacuate" ->
+ | optype == C.iallocatorModeChgGroup ->
+ do
+ rl_names <- extrReq "instances"
+ rl_insts <- mapM (liftM Instance.idx .
+ Container.findByName map_i) rl_names
+ gr_uuids <- extrReq "target_groups"
+ gr_idxes <- mapM (liftM Group.idx .
+ Container.findByName map_g) gr_uuids
+ return $ ChangeGroup rl_insts gr_idxes
+ | optype == C.iallocatorModeNodeEvac ->
do
- ex_names <- extrReq "evac_nodes"
- 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 cdata
-
--- | Format the result
-formatRVal :: RqType -> [Node.AllocElement] -> JSValue
-formatRVal _ [] = JSArray []
-
-formatRVal (Evacuate _) elems =
- let sols = map (\(_, inst, nl, _) -> Instance.name inst : map Node.name nl)
- elems
- jsols = map (JSArray . map (JSString . toJSString)) sols
- in JSArray jsols
-
-formatRVal _ elems =
- let (_, _, nodes, _) = head elems
- nodes' = map Node.name nodes
- in JSArray $ map (JSString . toJSString) nodes'
-
--- | Formats the response into a valid IAllocator response message.
+ rl_names <- extrReq "instances"
+ rl_insts <- mapM (Container.findByName map_i) rl_names
+ let rl_idx = map Instance.idx rl_insts
+ rl_mode <- extrReq "evac_mode"
+ return $ NodeEvacuate rl_idx rl_mode
+
+ | otherwise -> fail ("Invalid request type '" ++ optype ++ "'")
+ return (msgs, Request rqtype cdata)
+
+-- | Formats the result into a valid IAllocator response message.
formatResponse :: Bool -- ^ Whether the request was successful
-> String -- ^ Information text
- -> RqType -- ^ Request type
- -> [Node.AllocElement] -- ^ The resulting allocations
- -> String -- ^ The JSON-formatted message
-formatResponse success info rq elems =
- let
- e_success = ("success", JSBool success)
- e_info = ("info", JSString . toJSString $ info)
- e_nodes = ("nodes", formatRVal rq elems)
- in encodeStrict $ makeObj [e_success, e_info, e_nodes]
+ -> JSValue -- ^ The JSON encoded result
+ -> String -- ^ The full JSON-formatted message
+formatResponse success info result =
+ let e_success = ("success", showJSON success)
+ e_info = ("info", showJSON info)
+ e_result = ("result", result)
+ in encodeStrict $ makeObj [e_success, e_info, e_result]
+
+-- | Flatten the log of a solution into a string.
+describeSolution :: Cluster.AllocSolution -> String
+describeSolution = intercalate ", " . Cluster.asLog
+
+-- | Convert allocation/relocation results into the result format.
+formatAllocate :: Instance.List -> Cluster.AllocSolution -> Result IAllocResult
+formatAllocate il as = do
+ let info = describeSolution as
+ case Cluster.asSolution as of
+ Nothing -> fail info
+ Just (nl, inst, nodes, _) ->
+ do
+ let il' = Container.add (Instance.idx inst) inst il
+ return (info, showJSON $ map Node.name nodes, nl, il')
+
+-- | Convert a node-evacuation/change group result.
+formatNodeEvac :: Group.List
+ -> Node.List
+ -> Instance.List
+ -> (Node.List, Instance.List, Cluster.EvacSolution)
+ -> Result IAllocResult
+formatNodeEvac gl nl il (fin_nl, fin_il, es) =
+ let iname = Instance.name . flip Container.find il
+ nname = Node.name . flip Container.find nl
+ gname = Group.name . flip Container.find gl
+ fes = map (\(idx, msg) -> (iname idx, msg)) $ Cluster.esFailed es
+ mes = map (\(idx, gdx, ndxs) -> (iname idx, gname gdx, map nname ndxs))
+ $ Cluster.esMoved es
+ failed = length fes
+ moved = length mes
+ info = show failed ++ " instances failed to move and " ++ show moved ++
+ " were moved successfully"
+ in Ok (info, showJSON (mes, fes, Cluster.esOpCodes es), fin_nl, fin_il)
+
+-- | Runs relocate for a single instance.
+--
+-- This is wrapper over the 'Cluster.tryNodeEvac' function that is run
+-- with a single instance (ours), and further it checks that the
+-- result it got (in the nodes field) is actually consistent, as
+-- tryNodeEvac is designed to output primarily an opcode list, not a
+-- node list.
+processRelocate :: Group.List -- ^ The group list
+ -> Node.List -- ^ The node list
+ -> Instance.List -- ^ The instance list
+ -> Idx -- ^ The index of the instance to move
+ -> Int -- ^ The number of nodes required
+ -> [Ndx] -- ^ Nodes which should not be used
+ -> Result (Node.List, Instance.List, [Ndx]) -- ^ Solution list
+processRelocate gl nl il idx 1 exndx = do
+ let orig = Container.find idx il
+ sorig = Instance.sNode orig
+ porig = Instance.pNode orig
+ mir_type = Instance.mirrorType orig
+ (exp_node, node_type, reloc_type) <-
+ case mir_type of
+ MirrorNone -> fail "Can't relocate non-mirrored instances"
+ MirrorInternal -> return (sorig, "secondary", ChangeSecondary)
+ MirrorExternal -> return (porig, "primary", ChangePrimary)
+ when (exndx /= [exp_node]) $
+ -- FIXME: we can't use the excluded nodes here; the logic is
+ -- already _but only partially_ implemented in tryNodeEvac...
+ fail $ "Unsupported request: excluded nodes not equal to\
+ \ instance's " ++ node_type ++ "(" ++ show exp_node
+ ++ " versus " ++ show exndx ++ ")"
+ (nl', il', esol) <- Cluster.tryNodeEvac gl nl il reloc_type [idx]
+ nodes <- case lookup idx (Cluster.esFailed esol) of
+ Just msg -> fail msg
+ Nothing ->
+ case lookup idx (map (\(a, _, b) -> (a, b))
+ (Cluster.esMoved esol)) of
+ Nothing ->
+ fail "Internal error: lost instance idx during move"
+ Just n -> return n
+ let inst = Container.find idx il'
+ pnode = Instance.pNode inst
+ snode = Instance.sNode inst
+ nodes' <-
+ case mir_type of
+ MirrorNone -> fail "Internal error: mirror type none after relocation?!"
+ MirrorInternal ->
+ do
+ when (snode == sorig) $
+ fail "Internal error: instance didn't change secondary node?!"
+ when (snode == pnode) $
+ fail "Internal error: selected primary as new secondary?!"
+ if nodes == [pnode, snode]
+ then return [snode] -- only the new secondary is needed
+ else fail $ "Internal error: inconsistent node list (" ++
+ show nodes ++ ") versus instance nodes (" ++ show pnode ++
+ "," ++ show snode ++ ")"
+ MirrorExternal ->
+ do
+ when (pnode == porig) $
+ fail "Internal error: instance didn't change primary node?!"
+ if nodes == [pnode]
+ then return nodes
+ else fail $ "Internal error: inconsistent node list (" ++
+ show nodes ++ ") versus instance node (" ++ show pnode ++ ")"
+ return (nl', il', nodes')
+
+processRelocate _ _ _ _ reqn _ =
+ fail $ "Exchange " ++ show reqn ++ " nodes mode is not implemented"
+
+formatRelocate :: (Node.List, Instance.List, [Ndx])
+ -> Result IAllocResult
+formatRelocate (nl, il, ndxs) =
+ let nodes = map (`Container.find` nl) ndxs
+ names = map Node.name nodes
+ in Ok ("success", showJSON names, nl, il)
+
+-- | Process a request and return new node lists.
+processRequest :: Request -> Result IAllocResult
+processRequest request =
+ let Request rqtype (ClusterData gl nl il _ _) = request
+ in case rqtype of
+ Allocate xi reqn ->
+ Cluster.tryMGAlloc gl nl il xi reqn >>= formatAllocate il
+ Relocate idx reqn exnodes ->
+ processRelocate gl nl il idx reqn exnodes >>= formatRelocate
+ ChangeGroup gdxs idxs ->
+ Cluster.tryChangeGroup gl nl il idxs gdxs >>=
+ formatNodeEvac gl nl il
+ NodeEvacuate xi mode ->
+ Cluster.tryNodeEvac gl nl il mode xi >>=
+ formatNodeEvac gl nl il
+
+-- | Reads the request from the data file(s).
+readRequest :: FilePath -> IO Request
+readRequest fp = do
+ input_data <- case fp of
+ "-" -> getContents
+ _ -> readFile fp
+ case parseData input_data of
+ Bad err -> do
+ hPutStrLn stderr $ "Error: " ++ err
+ exitWith $ ExitFailure 1
+ Ok (fix_msgs, rq) -> maybeShowWarnings fix_msgs >> return rq
+
+-- | Main iallocator pipeline.
+runIAllocator :: Request -> (Maybe (Node.List, Instance.List), String)
+runIAllocator request =
+ let (ok, info, result, cdata) =
+ case processRequest request of
+ Ok (msg, r, nl, il) -> (True, "Request successful: " ++ msg, r,
+ Just (nl, il))
+ Bad msg -> (False, "Request failed: " ++ msg, JSArray [], Nothing)
+ rstring = formatResponse ok info result
+ in (cdata, rstring)
+
+-- | Load the data from an iallocation request file
+loadData :: FilePath -- ^ The path to the file
+ -> IO (Result ClusterData)
+loadData fp = do
+ Request _ cdata <- readRequest fp
+ return $ Ok cdata
projects / ganeti-local / blobdiff