184 lines
6.2 KiB
Haskell
184 lines
6.2 KiB
Haskell
{- git-annex assistant thread to scan remotes to find needed transfers
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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.Threads.TransferScanner where
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import Assistant.Common
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import Assistant.Types.ScanRemotes
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import Assistant.ScanRemotes
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import Assistant.TransferQueue
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import Assistant.DaemonStatus
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import Assistant.Drop
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import Assistant.Sync
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import Assistant.DeleteRemote
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import Assistant.Types.UrlRenderer
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import Logs.Transfer
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import Logs.Location
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import Logs.Group
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import Logs.Web (webUUID)
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import qualified Remote
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import qualified Types.Remote as Remote
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import Utility.ThreadScheduler
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import Utility.NotificationBroadcaster
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import Utility.Batch
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import qualified Git.LsFiles as LsFiles
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import qualified Backend
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import Annex.Content
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import Annex.Wanted
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import CmdLine.Action
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import qualified Data.Set as S
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{- This thread waits until a remote needs to be scanned, to find transfers
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- that need to be made, to keep data in sync.
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-}
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transferScannerThread :: UrlRenderer -> NamedThread
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transferScannerThread urlrenderer = namedThread "TransferScanner" $ do
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startupScan
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go S.empty
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where
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go scanned = do
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scanrunning False
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liftIO $ threadDelaySeconds (Seconds 2)
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(rs, infos) <- unzip <$> getScanRemote
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scanrunning True
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if any fullScan infos || any (`S.notMember` scanned) rs
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then do
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expensiveScan urlrenderer rs
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go $ scanned `S.union` S.fromList rs
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else do
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mapM_ failedTransferScan rs
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go scanned
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scanrunning b = do
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ds <- modifyDaemonStatus $ \s ->
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(s { transferScanRunning = b }, s)
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liftIO $ sendNotification $ transferNotifier ds
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{- All git remotes are synced, and all available remotes
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- are scanned in full on startup, for multiple reasons, including:
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-
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- * This may be the first run, and there may be remotes
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- already in place, that need to be synced.
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- * Changes may have been made last time we run, but remotes were
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- not available to be synced with.
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- * Changes may have been made to remotes while we were down.
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- * We may have run before, and scanned a remote, but
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- only been in a subdirectory of the git remote, and so
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- not synced it all.
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- * We may have run before, and had transfers queued,
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- and then the system (or us) crashed, and that info was
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- lost.
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- * A remote may be in the unwanted group, and this is a chance
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- to determine if the remote has been emptied.
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-}
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startupScan = do
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reconnectRemotes True =<< syncGitRemotes <$> getDaemonStatus
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addScanRemotes True =<< syncDataRemotes <$> getDaemonStatus
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{- This is a cheap scan for failed transfers involving a remote. -}
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failedTransferScan :: Remote -> Assistant ()
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failedTransferScan r = do
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failed <- liftAnnex $ clearFailedTransfers (Remote.uuid r)
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mapM_ retry failed
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where
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retry (t, info)
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| transferDirection t == Download =
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{- Check if the remote still has the key.
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- If not, relies on the expensiveScan to
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- get it queued from some other remote. -}
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whenM (liftAnnex $ remoteHas r $ transferKey t) $
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requeue t info
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| otherwise =
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{- The Transferrer checks when uploading
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- that the remote doesn't already have the
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- key, so it's not redundantly checked here. -}
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requeue t info
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requeue t info = queueTransferWhenSmall "retrying failed transfer" (associatedFile info) t r
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{- This is a expensive scan through the full git work tree, finding
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- files to transfer. The scan is blocked when the transfer queue gets
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- too large.
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-
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- This also finds files that are present either here or on a remote
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- but that are not preferred content, and drops them. Searching for files
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- to drop is done concurrently with the scan for transfers.
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-
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- TODO: It would be better to first drop as much as we can, before
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- transferring much, to minimise disk use.
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-
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- During the scan, we'll also check if any unwanted repositories are empty,
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- and can be removed. While unrelated, this is a cheap place to do it,
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- since we need to look at the locations of all keys anyway.
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-}
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expensiveScan :: UrlRenderer -> [Remote] -> Assistant ()
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expensiveScan urlrenderer rs = unless onlyweb $ batch <~> do
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debug ["starting scan of", show visiblers]
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let us = map Remote.uuid rs
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mapM_ (liftAnnex . clearFailedTransfers) us
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unwantedrs <- liftAnnex $ S.fromList
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<$> filterM inUnwantedGroup us
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g <- liftAnnex gitRepo
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(files, cleanup) <- liftIO $ LsFiles.inRepo [] g
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removablers <- scan unwantedrs files
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void $ liftIO cleanup
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debug ["finished scan of", show visiblers]
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remove <- asIO1 $ removableRemote urlrenderer
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liftIO $ mapM_ (void . tryNonAsync . remove) $ S.toList removablers
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where
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onlyweb = all (== webUUID) $ map Remote.uuid rs
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visiblers = let rs' = filter (not . Remote.readonly) rs
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in if null rs' then rs else rs'
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scan unwanted [] = return unwanted
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scan unwanted (f:fs) = do
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(unwanted', ts) <- maybe
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(return (unwanted, []))
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(findtransfers f unwanted)
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=<< liftAnnex (Backend.lookupFile f)
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mapM_ (enqueue f) ts
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scan unwanted' fs
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enqueue f (r, t) =
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queueTransferWhenSmall "expensive scan found missing object"
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(Just f) t r
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findtransfers f unwanted (key, _) = do
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{- The syncable remotes may have changed since this
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- scan began. -}
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syncrs <- syncDataRemotes <$> getDaemonStatus
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locs <- liftAnnex $ loggedLocations key
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present <- liftAnnex $ inAnnex key
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liftAnnex $ handleDropsFrom locs syncrs
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"expensive scan found too many copies of object"
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present key (Just f) Nothing callCommandAction
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liftAnnex $ do
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let slocs = S.fromList locs
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let use a = return $ mapMaybe (a key slocs) syncrs
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ts <- if present
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then filterM (wantSend True (Just key) (Just f) . Remote.uuid . fst)
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=<< use (genTransfer Upload False)
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else ifM (wantGet True (Just key) (Just f))
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( use (genTransfer Download True) , return [] )
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let unwanted' = S.difference unwanted slocs
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return (unwanted', ts)
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genTransfer :: Direction -> Bool -> Key -> S.Set UUID -> Remote -> Maybe (Remote, Transfer)
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genTransfer direction want key slocs r
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| direction == Upload && Remote.readonly r = Nothing
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| S.member (Remote.uuid r) slocs == want = Just
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(r, Transfer direction (Remote.uuid r) key)
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| otherwise = Nothing
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remoteHas :: Remote -> Key -> Annex Bool
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remoteHas r key = elem
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<$> pure (Remote.uuid r)
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<*> loggedLocations key
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