249 lines
8.6 KiB
Haskell
249 lines
8.6 KiB
Haskell
{- git-annex assistant daemon status
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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.DaemonStatus where
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import Common.Annex
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import Assistant.ThreadedMonad
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import Assistant.Alert
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import Utility.ThreadScheduler
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import Utility.TempFile
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import Utility.NotificationBroadcaster
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import Logs.Transfer
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import qualified Command.Sync
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import Control.Concurrent.STM
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import System.Posix.Types
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import Data.Time.Clock.POSIX
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import Data.Time
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import System.Locale
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import qualified Data.Map as M
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import Control.Exception
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data DaemonStatus = DaemonStatus
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-- False when the daemon is performing its startup scan
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{ scanComplete :: Bool
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-- Time when a previous process of the daemon was running ok
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, lastRunning :: Maybe POSIXTime
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-- True when the sanity checker is running
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, sanityCheckRunning :: Bool
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-- Last time the sanity checker ran
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, lastSanityCheck :: Maybe POSIXTime
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-- Currently running file content transfers
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, currentTransfers :: TransferMap
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-- Messages to display to the user.
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, alertMap :: AlertMap
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, alertMax :: AlertId
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-- Ordered list of remotes to talk to.
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, knownRemotes :: [Remote]
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-- Broadcasts notifications about all changes to the DaemonStatus
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, changeNotifier :: NotificationBroadcaster
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-- Broadcasts notifications when queued or current transfers change.
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, transferNotifier :: NotificationBroadcaster
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-- Broadcasts notifications when there's a change to the alerts
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, alertNotifier :: NotificationBroadcaster
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}
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type TransferMap = M.Map Transfer TransferInfo
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{- This TMVar is never left empty, so accessing it will never block. -}
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type DaemonStatusHandle = TMVar DaemonStatus
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newDaemonStatus :: IO DaemonStatus
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newDaemonStatus = DaemonStatus
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<$> pure False
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<*> pure Nothing
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<*> pure False
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<*> pure Nothing
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<*> pure M.empty
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<*> pure M.empty
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<*> pure firstAlertId
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<*> pure []
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<*> newNotificationBroadcaster
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<*> newNotificationBroadcaster
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<*> newNotificationBroadcaster
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getDaemonStatus :: DaemonStatusHandle -> IO DaemonStatus
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getDaemonStatus = atomically . readTMVar
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modifyDaemonStatus_ :: DaemonStatusHandle -> (DaemonStatus -> DaemonStatus) -> IO ()
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modifyDaemonStatus_ dstatus a = modifyDaemonStatus dstatus $ \s -> (a s, ())
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modifyDaemonStatus :: DaemonStatusHandle -> (DaemonStatus -> (DaemonStatus, b)) -> IO b
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modifyDaemonStatus dstatus a = do
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(s, b) <- atomically $ do
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r@(s, _) <- a <$> takeTMVar dstatus
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putTMVar dstatus s
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return r
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sendNotification $ changeNotifier s
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return b
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{- Updates the cached ordered list of remotes from the list in Annex
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- state. -}
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updateKnownRemotes :: DaemonStatusHandle -> Annex ()
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updateKnownRemotes dstatus = do
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remotes <- Command.Sync.syncRemotes []
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liftIO $ modifyDaemonStatus_ dstatus $
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\s -> s { knownRemotes = remotes }
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{- Load any previous daemon status file, and store it in a MVar for this
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- process to use as its DaemonStatus. Also gets current transfer status. -}
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startDaemonStatus :: Annex DaemonStatusHandle
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startDaemonStatus = do
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file <- fromRepo gitAnnexDaemonStatusFile
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status <- liftIO $
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catchDefaultIO (readDaemonStatusFile file) =<< newDaemonStatus
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transfers <- M.fromList <$> getTransfers
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remotes <- Command.Sync.syncRemotes []
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liftIO $ atomically $ newTMVar status
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{ scanComplete = False
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, sanityCheckRunning = False
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, currentTransfers = transfers
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, knownRemotes = remotes
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}
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{- This writes the daemon status to disk, when it changes, but no more
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- frequently than once every ten minutes.
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-}
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daemonStatusThread :: ThreadState -> DaemonStatusHandle -> IO ()
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daemonStatusThread st dstatus = do
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notifier <- newNotificationHandle
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=<< changeNotifier <$> getDaemonStatus dstatus
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checkpoint
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runEvery (Seconds tenMinutes) $ do
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waitNotification notifier
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checkpoint
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where
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checkpoint = do
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status <- getDaemonStatus dstatus
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file <- runThreadState st $ fromRepo gitAnnexDaemonStatusFile
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writeDaemonStatusFile file status
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{- Don't just dump out the structure, because it will change over time,
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- and parts of it are not relevant. -}
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writeDaemonStatusFile :: FilePath -> DaemonStatus -> IO ()
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writeDaemonStatusFile file status =
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viaTmp writeFile file =<< serialized <$> getPOSIXTime
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where
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serialized now = unlines
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[ "lastRunning:" ++ show now
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, "scanComplete:" ++ show (scanComplete status)
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, "sanityCheckRunning:" ++ show (sanityCheckRunning status)
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, "lastSanityCheck:" ++ maybe "" show (lastSanityCheck status)
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]
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readDaemonStatusFile :: FilePath -> IO DaemonStatus
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readDaemonStatusFile file = parse <$> newDaemonStatus <*> readFile file
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where
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parse status = foldr parseline status . lines
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parseline line status
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| key == "lastRunning" = parseval readtime $ \v ->
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status { lastRunning = Just v }
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| key == "scanComplete" = parseval readish $ \v ->
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status { scanComplete = v }
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| key == "sanityCheckRunning" = parseval readish $ \v ->
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status { sanityCheckRunning = v }
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| key == "lastSanityCheck" = parseval readtime $ \v ->
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status { lastSanityCheck = Just v }
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| otherwise = status -- unparsable line
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where
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(key, value) = separate (== ':') line
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parseval parser a = maybe status a (parser value)
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readtime s = do
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d <- parseTime defaultTimeLocale "%s%Qs" s
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Just $ utcTimeToPOSIXSeconds d
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{- Checks if a time stamp was made after the daemon was lastRunning.
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-
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- Some slop is built in; this really checks if the time stamp was made
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- at least ten minutes after the daemon was lastRunning. This is to
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- ensure the daemon shut down cleanly, and deal with minor clock skew.
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-
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- If the daemon has never ran before, this always returns False.
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-}
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afterLastDaemonRun :: EpochTime -> DaemonStatus -> Bool
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afterLastDaemonRun timestamp status = maybe False (< t) (lastRunning status)
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where
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t = realToFrac (timestamp + slop) :: POSIXTime
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slop = fromIntegral tenMinutes
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tenMinutes :: Int
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tenMinutes = 10 * 60
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{- Mutates the transfer map. Runs in STM so that the transfer map can
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- be modified in the same transaction that modifies the transfer queue.
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- Note that this does not send a notification of the change; that's left
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- to the caller. -}
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adjustTransfersSTM :: DaemonStatusHandle -> (TransferMap -> TransferMap) -> STM ()
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adjustTransfersSTM dstatus a = do
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s <- takeTMVar dstatus
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putTMVar dstatus $ s { currentTransfers = a (currentTransfers s) }
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{- Variant that does send notifications. -}
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adjustTransfers :: DaemonStatusHandle -> (TransferMap -> TransferMap) -> IO ()
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adjustTransfers dstatus a =
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notifyTransfer dstatus `after` modifyDaemonStatus_ dstatus go
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where
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go s = s { currentTransfers = a (currentTransfers s) }
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{- Removes a transfer from the map, and returns its info. -}
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removeTransfer :: DaemonStatusHandle -> Transfer -> IO (Maybe TransferInfo)
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removeTransfer dstatus t =
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notifyTransfer dstatus `after` modifyDaemonStatus dstatus go
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where
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go s =
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let (info, ts) = M.updateLookupWithKey
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(\_k _v -> Nothing)
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t (currentTransfers s)
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in (s { currentTransfers = ts }, info)
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{- Send a notification when a transfer is changed. -}
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notifyTransfer :: DaemonStatusHandle -> IO ()
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notifyTransfer dstatus = sendNotification
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=<< transferNotifier <$> atomically (readTMVar dstatus)
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{- Send a notification when alerts are changed. -}
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notifyAlert :: DaemonStatusHandle -> IO ()
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notifyAlert dstatus = sendNotification
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=<< alertNotifier <$> atomically (readTMVar dstatus)
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{- Returns the alert's identifier, which can be used to remove it. -}
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addAlert :: DaemonStatusHandle -> Alert -> IO AlertId
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addAlert dstatus alert = notifyAlert dstatus `after` modifyDaemonStatus dstatus go
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where
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go s = (s { alertMax = i, alertMap = m }, i)
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where
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i = nextAlertId $ alertMax s
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m = M.insertWith' const i alert (alertMap s)
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removeAlert :: DaemonStatusHandle -> AlertId -> IO ()
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removeAlert dstatus i = updateAlert dstatus i (const Nothing)
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updateAlert :: DaemonStatusHandle -> AlertId -> (Alert -> Maybe Alert) -> IO ()
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updateAlert dstatus i a = updateAlertMap dstatus $ \m -> M.update a i m
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updateAlertMap :: DaemonStatusHandle -> (AlertMap -> AlertMap) -> IO ()
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updateAlertMap dstatus a = notifyAlert dstatus `after` modifyDaemonStatus_ dstatus go
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where
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go s = s { alertMap = a (alertMap s) }
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{- Displays an alert while performing an activity.
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-
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- The alert is left visible afterwards, as filler.
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- Old filler is pruned, to prevent the map growing too large. -}
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alertWhile :: DaemonStatusHandle -> Alert -> IO Bool -> IO Bool
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alertWhile dstatus alert a = alertWhile' dstatus alert $ do
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r <- a
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return $ (r, r)
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alertWhile' :: DaemonStatusHandle -> Alert -> IO (Bool, a) -> IO a
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alertWhile' dstatus alert a = do
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let alert' = alert { alertClass = Activity }
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i <- addAlert dstatus alert'
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(ok, r) <- bracket_ noop noop a
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updateAlertMap dstatus $ convertToFiller i ok
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return r
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