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|
{- git-annex assistant thread to scan remotes to find needed transfers
-
- Copyright 2012 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Assistant.Threads.TransferScanner where
import Assistant.Common
import Assistant.ScanRemotes
import Assistant.TransferQueue
import Assistant.ThreadedMonad
import Assistant.DaemonStatus
import Assistant.Alert
import Logs.Transfer
import Logs.Location
import qualified Remote
import Utility.ThreadScheduler
import qualified Git.LsFiles as LsFiles
import Command
import Annex.Content
import qualified Data.Set as S
thisThread :: ThreadName
thisThread = "TransferScanner"
{- This thread waits until a remote needs to be scanned, to find transfers
- that need to be made, to keep data in sync.
-}
transferScannerThread :: ThreadState -> DaemonStatusHandle -> ScanRemoteMap -> TransferQueue -> IO ()
transferScannerThread st dstatus scanremotes transferqueue = do
startupScan
go S.empty
where
go scanned = do
threadDelaySeconds (Seconds 2)
(r, info) <- getScanRemote scanremotes
if fullScan info || not (S.member r scanned)
then do
expensiveScan st dstatus transferqueue r
go (S.insert r scanned)
else do
failedTransferScan st dstatus transferqueue r
go scanned
{- All available remotes are scanned in full on startup,
- for multiple reasons, including:
-
- * This may be the first run, and there may be remotes
- already in place, that need to be synced.
- * We may have run before, and scanned a remote, but
- only been in a subdirectory of the git remote, and so
- not synced it all.
- * We may have run before, and had transfers queued,
- and then the system (or us) crashed, and that info was
- lost.
-}
startupScan = addScanRemotes scanremotes True
=<< knownRemotes <$> getDaemonStatus dstatus
{- This is a cheap scan for failed transfers involving a remote. -}
failedTransferScan :: ThreadState -> DaemonStatusHandle -> TransferQueue -> Remote -> IO ()
failedTransferScan st dstatus transferqueue r = do
ts <- runThreadState st $
getFailedTransfers $ Remote.uuid r
go ts
where
go [] = noop
go ((t, info):ts)
| transferDirection t == Download = do
{- Check if the remote still has the key.
- If not, relies on the expensiveScan to
- get it queued from some other remote. -}
ifM (runThreadState st $ remoteHas r $ transferKey t)
( requeue t info
, dequeue t
)
go ts
| otherwise = do
{- The Transferrer checks when uploading
- that the remote doesn't already have the
- key, so it's not redundantly checked
- here. -}
requeue t info
go ts
requeue t info = do
queueTransferWhenSmall
transferqueue dstatus (associatedFile info) t r
dequeue t
dequeue t = void $ runThreadState st $ inRepo $
liftIO . tryIO . removeFile . failedTransferFile t
{- This is a expensive scan through the full git work tree.
-
- The scan is blocked when the transfer queue gets too large. -}
expensiveScan :: ThreadState -> DaemonStatusHandle -> TransferQueue -> Remote -> IO ()
expensiveScan st dstatus transferqueue r = do
liftIO $ debug thisThread ["starting scan of", show r]
void $ alertWhile dstatus (scanAlert r) $ do
g <- runThreadState st $ fromRepo id
files <- LsFiles.inRepo [] g
go files
return True
liftIO $ debug thisThread ["finished scan of", show r]
where
go [] = noop
go (f:fs) = do
v <- runThreadState st $ whenAnnexed check f
case v of
Nothing -> noop
Just t -> do
debug thisThread ["queuing", show t]
enqueue f t
go fs
where
check _ (key, _) = ifM (inAnnex key)
( helper key Upload False =<< remoteHas r key
, helper key Download True =<< remoteHas r key
)
helper key direction x y
| x == y = return $ Just $
Transfer direction (Remote.uuid r) key
| otherwise = return Nothing
enqueue f t = queueTransferWhenSmall transferqueue dstatus (Just f) t r
remoteHas :: Remote -> Key -> Annex Bool
remoteHas r key = elem
<$> pure (Remote.uuid r)
<*> loggedLocations key
|
