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{-# LANGUAGE OverloadedStrings #-}
{-
Bustle.Upgrade: synthesise information missing from old logs
Copyright (C) 2009 Collabora Ltd.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
-}
module Bustle.Upgrade (upgrade) where
import Control.Monad.State
import Data.Set (Set)
import qualified Data.Set as Set
import qualified Data.Text as Text
import Bustle.Types
-- Bustle <0.2.0 did not log NameOwnerChanged; this adds fake ones to logs
-- lacking them
upgrade :: [DetailedEvent] -> [DetailedEvent]
upgrade es =
case partitionDetaileds es of
([], ms) -> concat $ evalState (mapM synthesiseNOC ms) Set.empty
_ -> es
synthesiseNOC :: Detailed Message -> State (Set TaggedBusName) [DetailedEvent]
synthesiseNOC de@(Detailed µs m _) = do
fakes <- mapM synthDM $ mentionedNames m
return ( concat fakes ++ [fmap MessageEvent de] )
where
synthDM :: TaggedBusName -> State (Set TaggedBusName) [DetailedEvent]
synthDM n = do
fakes <- synth n
return $ map (\fake -> Detailed µs (NOCEvent fake) Nothing) fakes
synth :: TaggedBusName
-> State (Set TaggedBusName) [NOC]
synth n = do
b <- gets (Set.member n)
if b
then return []
else do
modify (Set.insert n)
return $ case n of
U u -> [ Connected u ]
O o -> [ Connected (fakeName o)
, NameChanged o (Claimed (fakeName o))
]
fakeName :: OtherName -> UniqueName
fakeName = fakeUniqueName . unOtherName
-- vim: sw=2 sts=2
|
