+{-# LANGUAGE TemplateHaskell #-}
+
{-| Implementation of the opcodes.
-}
{-
-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.OpCodes
- ( OpCode(..)
- , ReplaceDisksMode(..)
- , opID
- ) where
+ ( OpCode(..)
+ , ReplaceDisksMode(..)
+ , DiskIndex
+ , mkDiskIndex
+ , unDiskIndex
+ , opID
+ , allOpIDs
+ ) where
-import Control.Monad
import Text.JSON (readJSON, showJSON, makeObj, JSON)
-import qualified Text.JSON as J
-import Text.JSON.Types
-
-import Ganeti.HTools.Utils
-
-data ReplaceDisksMode = ReplaceOnPrimary
- | ReplaceOnSecondary
- | ReplaceNewSecondary
- | ReplaceAuto
- deriving (Show, Read, Eq)
-
-instance JSON ReplaceDisksMode where
- showJSON m = case m of
- ReplaceOnPrimary -> showJSON "replace_on_primary"
- ReplaceOnSecondary -> showJSON "replace_on_secondary"
- ReplaceNewSecondary -> showJSON "replace_new_secondary"
- ReplaceAuto -> showJSON "replace_auto"
- readJSON s = case readJSON s of
- J.Ok "replace_on_primary" -> J.Ok ReplaceOnPrimary
- J.Ok "replace_on_secondary" -> J.Ok ReplaceOnSecondary
- J.Ok "replace_new_secondary" -> J.Ok ReplaceNewSecondary
- J.Ok "replace_auto" -> J.Ok ReplaceAuto
- _ -> J.Error "Can't parse a valid ReplaceDisksMode"
-
-data OpCode = OpTestDelay Double Bool [String]
- | OpReplaceDisks String (Maybe String) ReplaceDisksMode
- [Int] (Maybe String)
- | OpFailoverInstance String Bool
- | OpMigrateInstance String Bool Bool Bool
- deriving (Show, Read, Eq)
-
-
-opID :: OpCode -> String
-opID (OpTestDelay _ _ _) = "OP_TEST_DELAY"
-opID (OpReplaceDisks _ _ _ _ _) = "OP_INSTANCE_REPLACE_DISKS"
-opID (OpFailoverInstance _ _) = "OP_INSTANCE_FAILOVER"
-opID (OpMigrateInstance _ _ _ _) = "OP_INSTANCE_MIGRATE"
-
-loadOpCode :: JSValue -> J.Result OpCode
-loadOpCode v = do
- o <- liftM J.fromJSObject (readJSON v)
- let extract x = fromObj o x
- op_id <- extract "OP_ID"
- case op_id of
- "OP_TEST_DELAY" -> do
- on_nodes <- extract "on_nodes"
- on_master <- extract "on_master"
- duration <- extract "duration"
- return $ OpTestDelay duration on_master on_nodes
- "OP_INSTANCE_REPLACE_DISKS" -> do
- inst <- extract "instance_name"
- node <- maybeFromObj o "remote_node"
- mode <- extract "mode"
- disks <- extract "disks"
- ialloc <- maybeFromObj o "iallocator"
- return $ OpReplaceDisks inst node mode disks ialloc
- "OP_INSTANCE_FAILOVER" -> do
- inst <- extract "instance_name"
- consist <- extract "ignore_consistency"
- return $ OpFailoverInstance inst consist
- "OP_INSTANCE_MIGRATE" -> do
- inst <- extract "instance_name"
- live <- extract "live"
- cleanup <- extract "cleanup"
- allow_failover <- extract "allow_failover"
- return $ OpMigrateInstance inst live cleanup allow_failover
- _ -> J.Error $ "Unknown opcode " ++ op_id
-
-saveOpCode :: OpCode -> JSValue
-saveOpCode op@(OpTestDelay duration on_master on_nodes) =
- let ol = [ ("OP_ID", showJSON $ opID op)
- , ("duration", showJSON duration)
- , ("on_master", showJSON on_master)
- , ("on_nodes", showJSON on_nodes) ]
- in makeObj ol
-
-saveOpCode op@(OpReplaceDisks inst node mode disks iallocator) =
- let ol = [ ("OP_ID", showJSON $ opID op)
- , ("instance_name", showJSON inst)
- , ("mode", showJSON mode)
- , ("disks", showJSON disks)]
- ol2 = case node of
- Just n -> ("remote_node", showJSON n):ol
- Nothing -> ol
- ol3 = case iallocator of
- Just i -> ("iallocator", showJSON i):ol2
- Nothing -> ol2
- in makeObj ol3
-
-saveOpCode op@(OpFailoverInstance inst consist) =
- let ol = [ ("OP_ID", showJSON $ opID op)
- , ("instance_name", showJSON inst)
- , ("ignore_consistency", showJSON consist) ]
- in makeObj ol
-
-saveOpCode op@(OpMigrateInstance inst live cleanup allow_failover) =
- let ol = [ ("OP_ID", showJSON $ opID op)
- , ("instance_name", showJSON inst)
- , ("live", showJSON live)
- , ("cleanup", showJSON cleanup)
- , ("allow_failover", showJSON allow_failover) ]
- in makeObj ol
+
+import qualified Ganeti.Constants as C
+import Ganeti.THH
+
+import Ganeti.JSON
+
+-- | Replace disks type.
+$(declareSADT "ReplaceDisksMode"
+ [ ("ReplaceOnPrimary", 'C.replaceDiskPri)
+ , ("ReplaceOnSecondary", 'C.replaceDiskSec)
+ , ("ReplaceNewSecondary", 'C.replaceDiskChg)
+ , ("ReplaceAuto", 'C.replaceDiskAuto)
+ ])
+$(makeJSONInstance ''ReplaceDisksMode)
+
+-- | Disk index type (embedding constraints on the index value via a
+-- smart constructor).
+newtype DiskIndex = DiskIndex { unDiskIndex :: Int }
+ deriving (Show, Read, Eq, Ord)
+
+-- | Smart constructor for 'DiskIndex'.
+mkDiskIndex :: (Monad m) => Int -> m DiskIndex
+mkDiskIndex i | i >= 0 && i < C.maxDisks = return (DiskIndex i)
+ | otherwise = fail $ "Invalid value for disk index '" ++
+ show i ++ "', required between 0 and " ++
+ show C.maxDisks
+
+instance JSON DiskIndex where
+ readJSON v = readJSON v >>= mkDiskIndex
+ showJSON = showJSON . unDiskIndex
+
+-- | OpCode representation.
+--
+-- We only implement a subset of Ganeti opcodes, but only what we
+-- actually use in the htools codebase.
+$(genOpCode "OpCode"
+ [ ("OpTestDelay",
+ [ simpleField "duration" [t| Double |]
+ , simpleField "on_master" [t| Bool |]
+ , simpleField "on_nodes" [t| [String] |]
+ ])
+ , ("OpInstanceReplaceDisks",
+ [ simpleField "instance_name" [t| String |]
+ , optionalField $ simpleField "remote_node" [t| String |]
+ , simpleField "mode" [t| ReplaceDisksMode |]
+ , simpleField "disks" [t| [DiskIndex] |]
+ , optionalField $ simpleField "iallocator" [t| String |]
+ ])
+ , ("OpInstanceFailover",
+ [ simpleField "instance_name" [t| String |]
+ , simpleField "ignore_consistency" [t| Bool |]
+ , optionalField $ simpleField "target_node" [t| String |]
+ ])
+ , ("OpInstanceMigrate",
+ [ simpleField "instance_name" [t| String |]
+ , simpleField "live" [t| Bool |]
+ , simpleField "cleanup" [t| Bool |]
+ , defaultField [| False |] $ simpleField "allow_failover" [t| Bool |]
+ , optionalField $ simpleField "target_node" [t| String |]
+ ])
+ ])
+
+-- | Returns the OP_ID for a given opcode value.
+$(genOpID ''OpCode "opID")
+
+-- | A list of all defined/supported opcode IDs.
+$(genAllOpIDs ''OpCode "allOpIDs")
instance JSON OpCode where
- readJSON = loadOpCode
- showJSON = saveOpCode
+ readJSON = loadOpCode
+ showJSON = saveOpCode
projects / ganeti-local / blobdiff