55 lines
1.8 KiB
Haskell
55 lines
1.8 KiB
Haskell
{- git-annex assistant transfer polling thread
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-
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- Copyright 2012 Joey Hess <id@joeyh.name>
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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.Threads.TransferPoller where
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import Assistant.Common
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import Assistant.DaemonStatus
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import Logs.Transfer
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import Utility.NotificationBroadcaster
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import qualified Assistant.Threads.TransferWatcher as TransferWatcher
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import Control.Concurrent
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import qualified Data.Map as M
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{- This thread polls the status of ongoing transfers, determining how much
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- of each transfer is complete. -}
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transferPollerThread :: NamedThread
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transferPollerThread = namedThread "TransferPoller" $ do
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g <- liftAnnex gitRepo
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tn <- liftIO . newNotificationHandle True =<<
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transferNotifier <$> getDaemonStatus
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forever $ do
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liftIO $ threadDelay 500000 -- 0.5 seconds
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ts <- currentTransfers <$> getDaemonStatus
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if M.null ts
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-- block until transfers running
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then liftIO $ waitNotification tn
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else mapM_ (poll g) $ M.toList ts
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where
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poll g (t, info)
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{- Downloads are polled by checking the size of the
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- temp file being used for the transfer. -}
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| transferDirection t == Download = do
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let f = gitAnnexTmpObjectLocation (transferKey t) g
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sz <- liftIO $ catchMaybeIO $ getFileSize f
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newsize t info sz
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{- Uploads don't need to be polled for when the TransferWatcher
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- thread can track file modifications. -}
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| TransferWatcher.watchesTransferSize = noop
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{- Otherwise, this code polls the upload progress
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- by reading the transfer info file. -}
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| otherwise = do
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let f = transferFile t g
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mi <- liftIO $ catchDefaultIO Nothing $
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readTransferInfoFile Nothing f
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maybe noop (newsize t info . bytesComplete) mi
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newsize t info sz
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| bytesComplete info /= sz && isJust sz =
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alterTransferInfo t $ \i -> i { bytesComplete = sz }
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| otherwise = noop
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