Revision 12c19659 htools/Ganeti/OpCodes.hs
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, opID |
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) where |
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import Control.Monad |
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import Text.JSON (readJSON, showJSON, makeObj, JSON) |
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import qualified Text.JSON as J |
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import Text.JSON.Types |
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import qualified Ganeti.Constants as C |
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import qualified Ganeti.THH as THH
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import Ganeti.THH
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import Ganeti.HTools.Utils |
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-- | Replace disks type. |
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$(THH.declareSADT "ReplaceDisksMode"
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$(declareSADT "ReplaceDisksMode" |
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[ ("ReplaceOnPrimary", 'C.replaceDiskPri)
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, ("ReplaceOnSecondary", 'C.replaceDiskSec)
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, ("ReplaceNewSecondary", 'C.replaceDiskChg)
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, ("ReplaceAuto", 'C.replaceDiskAuto)
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]) |
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$(THH.makeJSONInstance ''ReplaceDisksMode)
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$(makeJSONInstance ''ReplaceDisksMode) |
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-- | OpCode representation. |
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-- |
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-- We only implement a subset of Ganeti opcodes, but only what we |
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-- actually use in the htools codebase. |
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data OpCode = OpTestDelay Double Bool [String] |
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| OpInstanceReplaceDisks String (Maybe String) ReplaceDisksMode |
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[Int] (Maybe String) |
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| OpInstanceFailover String Bool (Maybe String) |
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| OpInstanceMigrate String Bool Bool Bool (Maybe String) |
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deriving (Show, Read, Eq) |
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$(THH.genOpID ''OpCode "opID") |
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-- | Loads an OpCode from the JSON serialised form. |
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loadOpCode :: JSValue -> J.Result OpCode |
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loadOpCode v = do |
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o <- liftM J.fromJSObject (readJSON v) |
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let extract x = fromObj o x |
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op_id <- extract "OP_ID" |
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case op_id of |
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"OP_TEST_DELAY" -> do |
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on_nodes <- extract "on_nodes" |
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on_master <- extract "on_master" |
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duration <- extract "duration" |
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return $ OpTestDelay duration on_master on_nodes |
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"OP_INSTANCE_REPLACE_DISKS" -> do |
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inst <- extract "instance_name" |
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node <- maybeFromObj o "remote_node" |
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mode <- extract "mode" |
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disks <- extract "disks" |
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ialloc <- maybeFromObj o "iallocator" |
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return $ OpInstanceReplaceDisks inst node mode disks ialloc |
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"OP_INSTANCE_FAILOVER" -> do |
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inst <- extract "instance_name" |
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consist <- extract "ignore_consistency" |
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tnode <- maybeFromObj o "target_node" |
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return $ OpInstanceFailover inst consist tnode |
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"OP_INSTANCE_MIGRATE" -> do |
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inst <- extract "instance_name" |
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live <- extract "live" |
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cleanup <- extract "cleanup" |
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allow_failover <- fromObjWithDefault o "allow_failover" False |
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tnode <- maybeFromObj o "target_node" |
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return $ OpInstanceMigrate inst live cleanup |
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allow_failover tnode |
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_ -> J.Error $ "Unknown opcode " ++ op_id |
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-- | Serialises an opcode to JSON. |
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saveOpCode :: OpCode -> JSValue |
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saveOpCode op@(OpTestDelay duration on_master on_nodes) = |
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let ol = [ ("OP_ID", showJSON $ opID op)
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, ("duration", showJSON duration)
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, ("on_master", showJSON on_master)
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, ("on_nodes", showJSON on_nodes) ]
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in makeObj ol |
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saveOpCode op@(OpInstanceReplaceDisks inst node mode disks iallocator) = |
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let ol = [ ("OP_ID", showJSON $ opID op)
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, ("instance_name", showJSON inst)
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, ("mode", showJSON mode)
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, ("disks", showJSON disks)]
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ol2 = case node of |
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Just n -> ("remote_node", showJSON n):ol
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Nothing -> ol |
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ol3 = case iallocator of |
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Just i -> ("iallocator", showJSON i):ol2
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Nothing -> ol2 |
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in makeObj ol3 |
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saveOpCode op@(OpInstanceFailover inst consist tnode) = |
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let ol = [ ("OP_ID", showJSON $ opID op)
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, ("instance_name", showJSON inst)
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, ("ignore_consistency", showJSON consist) ]
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ol' = case tnode of |
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Nothing -> ol |
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Just node -> ("target_node", showJSON node):ol
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in makeObj ol' |
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saveOpCode op@(OpInstanceMigrate inst live cleanup allow_failover tnode) = |
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let ol = [ ("OP_ID", showJSON $ opID op)
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, ("instance_name", showJSON inst)
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, ("live", showJSON live)
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, ("cleanup", showJSON cleanup)
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, ("allow_failover", showJSON allow_failover) ]
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ol' = case tnode of |
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Nothing -> ol |
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Just node -> ("target_node", showJSON node):ol
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in makeObj ol' |
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$(genOpCode "OpCode" |
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[ ("OpTestDelay",
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[ ("duration", [t| Double |], noDefault)
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, ("on_master", [t| Bool |], noDefault)
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, ("on_nodes", [t| [String] |], noDefault)
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]) |
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, ("OpInstanceReplaceDisks",
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[ ("instance_name", [t| String |], noDefault)
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, ("remote_node", [t| Maybe String |], noDefault)
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, ("mode", [t| ReplaceDisksMode |], noDefault)
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, ("disks", [t| [Int] |], noDefault)
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, ("iallocator", [t| Maybe String |], noDefault)
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]) |
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, ("OpInstanceFailover",
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[ ("instance_name", [t| String |], noDefault)
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, ("ignore_consistency", [t| Bool |], noDefault)
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, ("target_node", [t| Maybe String |], noDefault)
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]) |
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, ("OpInstanceMigrate",
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[ ("instance_name", [t| String |], noDefault)
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, ("live", [t| Bool |], noDefault)
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, ("cleanup", [t| Bool |], noDefault)
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, ("allow_failover", [t| Bool |], [| Just False |])
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, ("target_node", [t| Maybe String |], noDefault)
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]) |
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]) |
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$(genOpID ''OpCode "opID") |
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instance JSON OpCode where |
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readJSON = loadOpCode |
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