content: {-| Some utility functions, based on the Confd client, providing data
   in a ready-to-use way.
  -}
  
  {-
  
  Copyright (C) 2013 Google Inc.
  All rights reserved.
  
  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions are
  met:
  
  1. Redistributions of source code must retain the above copyright notice,
  this list of conditions and the following disclaimer.
  
  2. Redistributions in binary form must reproduce the above copyright
  notice, this list of conditions and the following disclaimer in the
  documentation and/or other materials provided with the distribution.
  
  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
  IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  -}
  
  module Ganeti.Confd.ClientFunctions
    ( getInstances
    , getInstanceDisks
    ) where
  
  import Control.Monad (liftM)
  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
    -> BT.ResultT String IO ([Ganeti.Objects.Instance], [Ganeti.Objects.Instance])
  getInstances node srvAddr srvPort = do
    client <- liftIO $ getConfdClient srvAddr srvPort
    reply <- liftIO . query client ReqNodeInstances $ PlainQuery node
    case fmap (J.readJSON . confdReplyAnswer) reply of
      Just (J.Ok instances) -> return instances
      Just (J.Error msg) -> fail msg
      Nothing -> fail "No answer from the Confd server"
  
  -- | Get the list of disks that belong to a given instance
  -- The server address and the server port parameters are mainly intended
  -- for testing purposes. If they are Nothing, the default values will be used.
  getDisks
    :: Ganeti.Objects.Instance
    -> Maybe String
    -> Maybe Int
    -> BT.ResultT String IO [Ganeti.Objects.Disk]
  getDisks inst srvAddr srvPort = do
    client <- liftIO $ getConfdClient srvAddr srvPort
    reply <- liftIO . query client ReqInstanceDisks . PlainQuery . uuidOf $ inst
    case fmap (J.readJSON . confdReplyAnswer) reply of
      Just (J.Ok disks) -> return disks
      Just (J.Error msg) -> fail msg
      Nothing -> fail "No answer from the Confd server"
  
  -- | Get the list of instances on the given node along with their disks
  -- The server address and the server port parameters are mainly intended
  -- for testing purposes. If they are Nothing, the default values will be used.
  getInstanceDisks
    :: String
    -> Maybe String
    -> Maybe Int
    -> BT.ResultT String IO [(Ganeti.Objects.Instance, [Ganeti.Objects.Disk])]
  getInstanceDisks node srvAddr srvPort =
    liftM (uncurry (++)) (getInstances node srvAddr srvPort) >>=
      mapM (\i -> liftM ((,) i) (getDisks i srvAddr srvPort))
  