Revision 00dd69a2 htools/Ganeti/HTools/IAlloc.hs
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-} |
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module Ganeti.HTools.IAlloc |
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( readRequest
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, runIAllocator
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, processRelocate
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) where
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( readRequest |
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, runIAllocator |
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, processRelocate |
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) where |
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import Data.Either () |
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import Data.Maybe (fromMaybe, isJust) |
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map_g = cdGroups cdata |
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optype <- extrReq "type" |
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rqtype <- |
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case () of
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_ | optype == C.iallocatorModeAlloc ->
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do
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rname <- extrReq "name"
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req_nodes <- extrReq "required_nodes"
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inew <- parseBaseInstance rname request
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let io = snd inew
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return $ Allocate io req_nodes
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| optype == C.iallocatorModeReloc ->
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do
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rname <- extrReq "name"
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ridx <- lookupInstance kti rname
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req_nodes <- extrReq "required_nodes"
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ex_nodes <- extrReq "relocate_from"
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ex_idex <- mapM (Container.findByName map_n) ex_nodes
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return $ Relocate ridx req_nodes (map Node.idx ex_idex)
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| optype == C.iallocatorModeChgGroup ->
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do
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rl_names <- extrReq "instances"
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rl_insts <- mapM (liftM Instance.idx .
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Container.findByName map_i) rl_names
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gr_uuids <- extrReq "target_groups"
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gr_idxes <- mapM (liftM Group.idx .
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Container.findByName map_g) gr_uuids
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return $ ChangeGroup rl_insts gr_idxes
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| optype == C.iallocatorModeNodeEvac ->
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do
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rl_names <- extrReq "instances"
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rl_insts <- mapM (Container.findByName map_i) rl_names
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let rl_idx = map Instance.idx rl_insts
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rl_mode <- extrReq "evac_mode"
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return $ NodeEvacuate rl_idx rl_mode
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case () of |
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_ | optype == C.iallocatorModeAlloc -> |
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do |
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rname <- extrReq "name" |
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req_nodes <- extrReq "required_nodes" |
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inew <- parseBaseInstance rname request |
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let io = snd inew |
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return $ Allocate io req_nodes |
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| optype == C.iallocatorModeReloc -> |
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do |
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rname <- extrReq "name" |
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ridx <- lookupInstance kti rname |
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req_nodes <- extrReq "required_nodes" |
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ex_nodes <- extrReq "relocate_from" |
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ex_idex <- mapM (Container.findByName map_n) ex_nodes |
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return $ Relocate ridx req_nodes (map Node.idx ex_idex) |
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| optype == C.iallocatorModeChgGroup -> |
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do |
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rl_names <- extrReq "instances" |
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rl_insts <- mapM (liftM Instance.idx . |
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Container.findByName map_i) rl_names |
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gr_uuids <- extrReq "target_groups" |
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gr_idxes <- mapM (liftM Group.idx . |
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Container.findByName map_g) gr_uuids |
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return $ ChangeGroup rl_insts gr_idxes |
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| optype == C.iallocatorModeNodeEvac -> |
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do |
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rl_names <- extrReq "instances" |
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rl_insts <- mapM (Container.findByName map_i) rl_names |
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let rl_idx = map Instance.idx rl_insts |
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rl_mode <- extrReq "evac_mode" |
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return $ NodeEvacuate rl_idx rl_mode |
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| otherwise -> fail ("Invalid request type '" ++ optype ++ "'")
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| otherwise -> fail ("Invalid request type '" ++ optype ++ "'")
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return (msgs, Request rqtype cdata) |
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-- | Formats the result into a valid IAllocator response message. |
| ... | ... | |
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-> JSValue -- ^ The JSON encoded result |
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-> String -- ^ The full JSON-formatted message |
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formatResponse success info result = |
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let |
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e_success = ("success", showJSON success)
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e_info = ("info", showJSON info)
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e_result = ("result", result)
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in encodeStrict $ makeObj [e_success, e_info, e_result] |
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let e_success = ("success", showJSON success)
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e_info = ("info", showJSON info)
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e_result = ("result", result)
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in encodeStrict $ makeObj [e_success, e_info, e_result] |
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-- | Flatten the log of a solution into a string. |
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describeSolution :: Cluster.AllocSolution -> String |
| ... | ... | |
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case Cluster.asSolution as of |
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Nothing -> fail info |
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Just (nl, inst, nodes, _) -> |
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do
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let il' = Container.add (Instance.idx inst) inst il
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return (info, showJSON $ map Node.name nodes, nl, il')
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do |
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let il' = Container.add (Instance.idx inst) inst il |
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return (info, showJSON $ map Node.name nodes, nl, il') |
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-- | Convert a node-evacuation/change group result. |
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formatNodeEvac :: Group.List |
| ... | ... | |
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-> (Node.List, Instance.List, Cluster.EvacSolution) |
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-> Result IAllocResult |
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formatNodeEvac gl nl il (fin_nl, fin_il, es) = |
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let iname = Instance.name . flip Container.find il
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nname = Node.name . flip Container.find nl
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gname = Group.name . flip Container.find gl
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fes = map (\(idx, msg) -> (iname idx, msg)) $ Cluster.esFailed es
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mes = map (\(idx, gdx, ndxs) -> (iname idx, gname gdx, map nname ndxs))
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$ Cluster.esMoved es
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failed = length fes
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moved = length mes
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info = show failed ++ " instances failed to move and " ++ show moved ++
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" were moved successfully"
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in Ok (info, showJSON (mes, fes, Cluster.esOpCodes es), fin_nl, fin_il)
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let iname = Instance.name . flip Container.find il |
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nname = Node.name . flip Container.find nl |
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gname = Group.name . flip Container.find gl |
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fes = map (\(idx, msg) -> (iname idx, msg)) $ Cluster.esFailed es |
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mes = map (\(idx, gdx, ndxs) -> (iname idx, gname gdx, map nname ndxs)) |
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$ Cluster.esMoved es |
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failed = length fes |
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moved = length mes |
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info = show failed ++ " instances failed to move and " ++ show moved ++ |
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" were moved successfully" |
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in Ok (info, showJSON (mes, fes, Cluster.esOpCodes es), fin_nl, fin_il) |
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-- | Runs relocate for a single instance. |
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-- |
| ... | ... | |
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formatRelocate :: (Node.List, Instance.List, [Ndx]) |
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-> Result IAllocResult |
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formatRelocate (nl, il, ndxs) = |
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let nodes = map (`Container.find` nl) ndxs
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names = map Node.name nodes
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in Ok ("success", showJSON names, nl, il)
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let nodes = map (`Container.find` nl) ndxs |
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names = map Node.name nodes |
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in Ok ("success", showJSON names, nl, il)
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-- | Process a request and return new node lists. |
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processRequest :: Request -> Result IAllocResult |
| ... | ... | |
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let Request rqtype (ClusterData gl nl il _) = request |
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in case rqtype of |
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Allocate xi reqn -> |
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Cluster.tryMGAlloc gl nl il xi reqn >>= formatAllocate il
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Cluster.tryMGAlloc gl nl il xi reqn >>= formatAllocate il |
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Relocate idx reqn exnodes -> |
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processRelocate gl nl il idx reqn exnodes >>= formatRelocate
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processRelocate gl nl il idx reqn exnodes >>= formatRelocate |
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ChangeGroup gdxs idxs -> |
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Cluster.tryChangeGroup gl nl il idxs gdxs >>=
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formatNodeEvac gl nl il
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Cluster.tryChangeGroup gl nl il idxs gdxs >>= |
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formatNodeEvac gl nl il |
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NodeEvacuate xi mode -> |
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Cluster.tryNodeEvac gl nl il mode xi >>=
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formatNodeEvac gl nl il
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Cluster.tryNodeEvac gl nl il mode xi >>= |
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formatNodeEvac gl nl il |
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-- | Reads the request from the data file(s). |
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readRequest :: Options -> [String] -> IO Request |
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readRequest opts args = do |
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when (null args) $ do |
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hPutStrLn stderr "Error: this program needs an input file."
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exitWith $ ExitFailure 1
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hPutStrLn stderr "Error: this program needs an input file." |
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exitWith $ ExitFailure 1 |
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input_data <- readFile (head args) |
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r1 <- case parseData input_data of |
| ... | ... | |
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runIAllocator :: Request -> (Maybe (Node.List, Instance.List), String) |
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runIAllocator request = |
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let (ok, info, result, cdata) = |
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case processRequest request of
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Ok (msg, r, nl, il) -> (True, "Request successful: " ++ msg, r,
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Just (nl, il))
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Bad msg -> (False, "Request failed: " ++ msg, JSArray [], Nothing)
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case processRequest request of |
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Ok (msg, r, nl, il) -> (True, "Request successful: " ++ msg, r, |
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Just (nl, il)) |
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Bad msg -> (False, "Request failed: " ++ msg, JSArray [], Nothing) |
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rstring = formatResponse ok info result |
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in (cdata, rstring) |
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