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{-| Some utility functions, based on the Confd client, providing data

 in a ready-to-use way.

-}

{-

Copyright (C) 2013 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.Confd.ClientFunctions

  ( getInstances

  ) where

import qualified Text.JSON as J

import Ganeti.BasicTypes as BT

import Ganeti.Confd.Types

import Ganeti.Confd.Client

import Ganeti.Objects

-- | Get the list of instances the given node is ([primary], [secondary]) for.

-- The server address and the server port parameters are mainly intended

-- for testing purposes. If they are Nothing, the default values will be used.

getInstances

  :: String

  -> Maybe String

  -> Maybe Int

  -> IO (BT.Result ([Ganeti.Objects.Instance], [Ganeti.Objects.Instance]))

getInstances node srvAddr srvPort = do

  client <- getConfdClient srvAddr srvPort

  reply <- query client ReqNodeInstances $ PlainQuery node

  return $

    case fmap (J.readJSON . confdReplyAnswer) reply of

      Just (J.Ok instances) -> BT.Ok instances

      Just (J.Error msg) -> BT.Bad msg

      Nothing -> BT.Bad "No answer from the Confd server"