root / src / Ganeti / Network.hs @ fc4be2bf
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{-| Implementation of the Ganeti network objects. |
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This is does not (yet) cover all methods that are provided in the |
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corresponding python implementation (network.py). |
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-} |
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{- |
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Copyright (C) 2011, 2012, 2013 Google Inc. |
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, but |
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WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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02110-1301, USA. |
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-} |
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module Ganeti.Network |
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( AddressPool(..) |
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, createAddressPool |
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, bitStringToBitVector |
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, allReservations |
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, getReservedCount |
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, getFreeCount |
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, isFull |
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, getMap |
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, networkIsValid |
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) where |
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import qualified Data.Vector.Unboxed as V |
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import Ganeti.Objects |
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-- | An address pool, holding a network plus internal and external |
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-- reservations. |
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data AddressPool = AddressPool { network :: Network, |
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reservations :: V.Vector Bool, |
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extReservations :: V.Vector Bool } |
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deriving (Show) |
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-- | Create an address pool from a network. |
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createAddressPool :: Network -> Maybe AddressPool |
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createAddressPool n |
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| networkIsValid n = |
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let res = maybeStr2BitVec $ networkReservations n |
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ext_res = maybeStr2BitVec $ networkExtReservations n |
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in Just AddressPool { reservations = res |
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, extReservations = ext_res |
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, network = n } |
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| otherwise = Nothing |
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-- | Checks the consistency of the network object. So far, only checks the |
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-- length of the reservation strings. |
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networkIsValid :: Network -> Bool |
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networkIsValid n = |
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sameLength (networkReservations n) (networkExtReservations n) |
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-- | Checks if two maybe strings are both nothing or of equal length. |
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sameLength :: Maybe String -> Maybe String -> Bool |
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sameLength Nothing Nothing = True |
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sameLength (Just s1) (Just s2) = length s1 == length s2 |
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sameLength _ _ = False |
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-- | Converts a maybe bit string to a bit vector. Returns an empty bit vector on |
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-- nothing. |
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maybeStr2BitVec :: Maybe String -> V.Vector Bool |
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maybeStr2BitVec (Just s) = bitStringToBitVector s |
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maybeStr2BitVec Nothing = V.fromList ([]::[Bool]) |
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-- | Converts a string to a bit vector. The character '0' is interpreted |
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-- as 'False', all others as 'True'. |
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bitStringToBitVector :: String -> V.Vector Bool |
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bitStringToBitVector = V.fromList . map (/= '0') |
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-- | Get a bit vector of all reservations (internal and external) combined. |
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allReservations :: AddressPool -> V.Vector Bool |
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allReservations a = V.zipWith (||) (reservations a) (extReservations a) |
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-- | Get the count of reserved addresses. |
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getReservedCount :: AddressPool -> Int |
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getReservedCount = V.length . V.filter (== True) . allReservations |
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-- | Get the count of free addresses. |
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getFreeCount :: AddressPool -> Int |
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getFreeCount = V.length . V.filter (== False) . allReservations |
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-- | Check whether the network is full. |
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isFull :: AddressPool -> Bool |
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isFull = V.and . allReservations |
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-- | Return a textual representation of the network's occupation status. |
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getMap :: AddressPool -> String |
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getMap = V.toList . V.map mapPixel . allReservations |
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where mapPixel c = if c then 'X' else '.' |