-}
module Ganeti.HTools.IAlloc
- ( parseData
- , formatResponse
+ ( readRequest
+ , runIAllocator
) where
import Data.Either ()
-import Data.Maybe (fromMaybe)
+import Data.Maybe (fromMaybe, isJust)
+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 (exitWith, ExitCode(..))
+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.ExtLoader (loadExternalData)
import Ganeti.HTools.Utils
import Ganeti.HTools.Types
+-- | Type alias for the result of an IAllocator call.
+type IAllocResult = (String, JSValue)
+
-- | Parse the basic specifications of an instance.
--
-- Instances in the cluster instance list and the instance in an
mem <- extract "memory"
vcpus <- extract "vcpus"
tags <- extract "tags"
+ dt <- extract "disk_template"
let running = "running"
- return (n, Instance.create n mem disk vcpus running tags True 0 0)
+ return (n, Instance.create n mem disk vcpus running tags True 0 0 dt)
-- | Parses an instance as found in the cluster instance list.
parseInstance :: NameAssoc -- ^ The node name-to-index association list
| otherwise -> fail ("Invalid request type '" ++ optype ++ "'")
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.
+-- | 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 =
+ -> JSValue -- ^ The JSON encoded result
+ -> String -- ^ The full JSON-formatted message
+formatResponse success info result =
let
- e_success = ("success", JSBool success)
- e_info = ("info", JSString . toJSString $ info)
- e_result = ("result", formatRVal rq elems)
+ 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 evacuation results into the result format.
+formatEvacuate :: Cluster.AllocSolution -> Result IAllocResult
+formatEvacuate as = do
+ let info = describeSolution as
+ elems = Cluster.asSolutions as
+ when (null elems) $ fail info
+ let sols = map (\(_, inst, nl, _) -> Instance.name inst : map Node.name nl)
+ elems
+ return (info, showJSON sols)
+
+-- | Convert allocation/relocation results into the result format.
+formatAllocate :: Cluster.AllocSolution -> Result IAllocResult
+formatAllocate as = do
+ let info = describeSolution as
+ case Cluster.asSolutions as of
+ [] -> fail info
+ (_, _, nodes, _):[] -> return (info, showJSON $ map (Node.name) nodes)
+ _ -> fail "Internal error: multiple allocation solutions"
+
+-- | 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
+ Relocate idx reqn exnodes ->
+ Cluster.tryMGReloc gl nl il idx reqn exnodes >>= formatAllocate
+ Evacuate exnodes ->
+ Cluster.tryMGEvac gl nl il exnodes >>= formatEvacuate
+ MultiReloc _ _ -> fail "multi-reloc not handled"
+ NodeEvacuate _ _ -> fail "node-evacuate not handled"
+
+-- | Reads the request from the data file(s)
+readRequest :: Options -> [String] -> IO Request
+readRequest opts args = do
+ when (null args) $ do
+ hPutStrLn stderr "Error: this program needs an input file."
+ exitWith $ ExitFailure 1
+
+ input_data <- readFile (head args)
+ r1 <- case parseData input_data of
+ Bad err -> do
+ hPutStrLn stderr $ "Error: " ++ err
+ exitWith $ ExitFailure 1
+ Ok rq -> return rq
+ (if isJust (optDataFile opts) || (not . null . optNodeSim) opts
+ then do
+ cdata <- loadExternalData opts
+ let Request rqt _ = r1
+ return $ Request rqt cdata
+ else return r1)
+
+-- | Main iallocator pipeline.
+runIAllocator :: Request -> String
+runIAllocator request =
+ let (ok, info, result) =
+ case processRequest request of
+ Ok (msg, r) -> (True, "Request successful: " ++ msg, r)
+ Bad msg -> (False, "Request failed: " ++ msg, JSArray [])
+ in formatResponse ok info result
projects / ganeti-local / blobdiff