40 lines
1.2 KiB
Haskell
40 lines
1.2 KiB
Haskell
{- git-annex assistant push tracking
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-
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- Copyright 2012 Joey Hess <joey@kitenet.net>
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-
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- Licensed under the GNU GPL version 3 or higher.
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-}
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module Assistant.Pushes where
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import Assistant.Common
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import Assistant.Types.Pushes
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import Control.Concurrent.STM
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import Data.Time.Clock
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import qualified Data.Map as M
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{- Blocks until there are failed pushes.
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- Returns Remotes whose pushes failed a given time duration or more ago.
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- (This may be an empty list.) -}
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getFailedPushesBefore :: NominalDiffTime -> Assistant [Remote]
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getFailedPushesBefore duration = do
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v <- getAssistant failedPushMap
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liftIO $ do
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m <- atomically $ readTMVar v
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now <- getCurrentTime
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return $ M.keys $ M.filter (not . toorecent now) m
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where
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toorecent now time = now `diffUTCTime` time < duration
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{- Modifies the map. -}
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changeFailedPushMap :: (PushMap -> PushMap) -> Assistant ()
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changeFailedPushMap a = do
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v <- getAssistant failedPushMap
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liftIO $ atomically $ store v . a . fromMaybe M.empty =<< tryTakeTMVar v
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where
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{- tryTakeTMVar empties the TMVar; refill it only if
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- the modified map is not itself empty -}
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store v m
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| m == M.empty = noop
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| otherwise = putTMVar v $! m
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