Synnefo » snf-ganeti » ganeti-local

{-| Module describing an instance.

The instance data type holds very few fields, the algorithm

intelligence is in the "Node" and "Cluster" modules.

-}

{-

Copyright (C) 2009 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

the Free Software Foundation; either version 2 of the License, or

(at your option) any later version.

This program is distributed in the hope that it will be useful, but

WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

General Public License for more details.

You should have received a copy of the GNU General Public License

along with this program; if not, write to the Free Software

Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301, USA.

-}

module Ganeti.HTools.Instance where

import qualified Ganeti.HTools.Types as T

import qualified Ganeti.HTools.Container as Container

-- * Type declarations

-- | The instance type

data Instance = Instance { name :: String   -- ^ The instance name

                         , mem :: Int       -- ^ Memory of the instance

                         , dsk :: Int       -- ^ Disk size of instance

                         , running :: Bool  -- ^ Whether the instance

                                            -- is running

                         , run_st :: String -- ^ Original (text) run status

                         , pnode :: T.Ndx   -- ^ Original primary node

                         , snode :: T.Ndx   -- ^ Original secondary node

                         , idx :: T.Idx     -- ^ Internal index for

                                            -- book-keeping

                         } deriving (Show)

instance T.Element Instance where

    nameOf  = name

    idxOf   = idx

    setName = setName

    setIdx  = setIdx

-- | A simple name for the int, instance association list.

type AssocList = [(T.Idx, Instance)]

-- | A simple name for an instance map.

type List = Container.Container Instance

-- * Initialization

-- | Create an instance.

--

-- Some parameters are not initialized by function, and must be set

-- later (via 'setIdx' for example).

create :: String -> Int -> Int -> String -> T.Ndx -> T.Ndx -> Instance

create name_init mem_init dsk_init run_init pn sn =

    Instance {

          name = name_init,

          mem = mem_init,

          dsk = dsk_init,

          running = case run_init of

                      "running" -> True

                      "ERROR_up" -> True

                      _ -> False,

          run_st = run_init,

          pnode = pn,

          snode = sn,

          idx = -1

        }

-- | Changes the index.

--

-- This is used only during the building of the data structures.

setIdx :: Instance -- ^ The original instance

       -> T.Idx    -- ^ New index

       -> Instance -- ^ The modified instance

setIdx t i = t { idx = i }

-- | Changes the name.

--

-- This is used only during the building of the data structures.

setName :: Instance -- ^ The original instance

        -> String   -- ^ New name

        -> Instance -- ^ The modified instance

setName t s = t { name = s }

-- * Update functions

-- | Changes the primary node of the instance.

setPri :: Instance  -- ^ the original instance

        -> T.Ndx    -- ^ the new primary node

        -> Instance -- ^ the modified instance

setPri t p = t { pnode = p }

-- | Changes the secondary node of the instance.

setSec :: Instance  -- ^ the original instance

        -> T.Ndx    -- ^ the new secondary node

        -> Instance -- ^ the modified instance

setSec t s = t { snode = s }

-- | Changes both nodes of the instance.

setBoth :: Instance  -- ^ the original instance

         -> T.Ndx    -- ^ new primary node index

         -> T.Ndx    -- ^ new secondary node index

         -> Instance -- ^ the modified instance

setBoth t p s = t { pnode = p, snode = s }