250 lines
7.5 KiB
Haskell
250 lines
7.5 KiB
Haskell
{-# LANGUAGE BangPatterns #-}
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{- git-annex location log
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-
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- git-annex keeps track of which repositories have the contents of annexed
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- files.
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-
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- Repositories record their UUID and the date when they --get or --drop
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- a value.
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-
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- Copyright 2010-2024 Joey Hess <id@joeyh.name>
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-
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- Licensed under the GNU AGPL version 3 or higher.
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-}
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{-# LANGUAGE BangPatterns #-}
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module Logs.Location (
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LogStatus(..),
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logStatus,
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logStatusAfter,
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logChange,
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loggedLocations,
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loggedPreviousLocations,
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loggedLocationsHistorical,
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loggedLocationsRef,
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parseLoggedLocations,
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isKnownKey,
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checkDead,
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setDead,
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Unchecked,
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finishCheck,
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loggedKeys,
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loggedKeysFor,
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loggedKeysFor',
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overLocationLogs,
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overLocationLogs',
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) where
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import Annex.Common
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import qualified Annex.Branch
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import Logs
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import Logs.Presence
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import Logs.Cluster
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import Annex.UUID
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import Annex.CatFile
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import Annex.VectorClock
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import Git.Types (RefDate, Ref)
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import qualified Annex
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import Data.Time.Clock
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import qualified Data.ByteString.Lazy as L
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import qualified Data.Map as M
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import qualified Data.Set as S
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{- Log a change in the presence of a key's value in current repository. -}
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logStatus :: Key -> LogStatus -> Annex ()
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logStatus key s = do
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u <- getUUID
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logChange key u s
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{- Run an action that gets the content of a key, and update the log
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- when it succeeds. -}
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logStatusAfter :: Key -> Annex Bool -> Annex Bool
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logStatusAfter key a = ifM a
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( do
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logStatus key InfoPresent
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return True
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, return False
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)
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{- Log a change in the presence of a key's value in a repository.
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-
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- Cluster UUIDs are not logged. Instead, when a node of a cluster is
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- logged to contain a key, loading the log will include the cluster's
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- UUID.
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-}
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logChange :: Key -> UUID -> LogStatus -> Annex ()
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logChange key u@(UUID _) s
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| isClusterUUID u = noop
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| otherwise = do
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config <- Annex.getGitConfig
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maybeAddLog
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(Annex.Branch.RegardingUUID [u])
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(locationLogFile config key)
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s
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(LogInfo (fromUUID u))
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logChange _ NoUUID _ = noop
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{- Returns a list of repository UUIDs that, according to the log, have
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- the value of a key. -}
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loggedLocations :: Key -> Annex [UUID]
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loggedLocations = getLoggedLocations presentLogInfo
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{- Returns a list of repository UUIDs that the location log indicates
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- used to have the vale of a key, but no longer do.
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-}
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loggedPreviousLocations :: Key -> Annex [UUID]
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loggedPreviousLocations = getLoggedLocations notPresentLogInfo
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{- Gets the location log on a particular date. -}
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loggedLocationsHistorical :: RefDate -> Key -> Annex [UUID]
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loggedLocationsHistorical = getLoggedLocations . historicalLogInfo
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{- Gets the locations contained in a git ref. -}
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loggedLocationsRef :: Ref -> Annex [UUID]
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loggedLocationsRef ref = map (toUUID . fromLogInfo) . getLog <$> catObject ref
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{- Parses the content of a log file and gets the locations in it. -}
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parseLoggedLocations :: Clusters -> L.ByteString -> [UUID]
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parseLoggedLocations clusters l = addClusterUUIDs clusters $
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map (toUUID . fromLogInfo . info)
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(filterPresent (parseLog l))
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getLoggedLocations :: (RawFilePath -> Annex [LogInfo]) -> Key -> Annex [UUID]
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getLoggedLocations getter key = do
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config <- Annex.getGitConfig
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locs <- map (toUUID . fromLogInfo) <$> getter (locationLogFile config key)
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clusters <- getClusters
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return $ addClusterUUIDs clusters locs
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-- Add UUIDs of any clusters whose nodes are in the list.
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addClusterUUIDs :: Clusters -> [UUID] -> [UUID]
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addClusterUUIDs clusters locs
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| M.null clustermap = locs
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-- ^ optimisation for common case of no clusters
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| otherwise = clusterlocs ++ locs
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where
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clustermap = clusterNodeUUIDs clusters
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clusterlocs = map fromClusterUUID $ S.toList $
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S.unions $ mapMaybe findclusters locs
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findclusters u = M.lookup (ClusterNodeUUID u) clustermap
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{- Is there a location log for the key? True even for keys with no
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- remaining locations. -}
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isKnownKey :: Key -> Annex Bool
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isKnownKey key = do
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config <- Annex.getGitConfig
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not . null <$> readLog (locationLogFile config key)
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{- For a key to be dead, all locations that have location status for the key
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- must have InfoDead set. -}
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checkDead :: Key -> Annex Bool
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checkDead key = do
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config <- Annex.getGitConfig
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ls <- compactLog <$> readLog (locationLogFile config key)
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return $! all (\l -> status l == InfoDead) ls
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{- Updates the log to say that a key is dead.
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-
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- Changes all logged lines for the key, in any location, that are
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- currently InfoMissing, to be InfoDead.
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-
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- The vector clock in the log is updated minimally, so that any
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- other location log changes are guaranteed to overrule this.
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-}
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setDead :: Key -> Annex ()
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setDead key = do
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config <- Annex.getGitConfig
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let logfile = locationLogFile config key
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ls <- compactLog <$> readLog logfile
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mapM_ (go logfile) (filter (\l -> status l == InfoMissing) ls)
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where
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go logfile l =
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let u = toUUID (fromLogInfo (info l))
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c = case date l of
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VectorClock v -> CandidateVectorClock $
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v + realToFrac (picosecondsToDiffTime 1)
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Unknown -> CandidateVectorClock 0
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in addLog' (Annex.Branch.RegardingUUID [u]) logfile InfoDead
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(info l) c
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data Unchecked a = Unchecked (Annex (Maybe a))
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finishCheck :: Unchecked a -> Annex (Maybe a)
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finishCheck (Unchecked a) = a
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{- Finds all keys that have location log information.
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- (There may be duplicate keys in the list.)
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-
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- Keys that have been marked as dead are not included.
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-}
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loggedKeys :: Annex (Maybe ([Unchecked Key], IO Bool))
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loggedKeys = loggedKeys' (not <$$> checkDead)
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loggedKeys' :: (Key -> Annex Bool) -> Annex (Maybe ([Unchecked Key], IO Bool))
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loggedKeys' check = do
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config <- Annex.getGitConfig
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Annex.Branch.files >>= \case
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Nothing -> return Nothing
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Just (bfs, cleanup) -> do
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let l = mapMaybe (defercheck <$$> locationLogFileKey config) bfs
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return (Just (l, cleanup))
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where
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defercheck k = Unchecked $ ifM (check k)
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( return (Just k)
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, return Nothing
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)
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{- Finds all keys that have location log information indicating
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- they are present in the specified repository.
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-
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- This does not stream well; use loggedKeysFor' for lazy streaming.
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-}
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loggedKeysFor :: UUID -> Annex (Maybe [Key])
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loggedKeysFor u = loggedKeysFor' u >>= \case
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Nothing -> return Nothing
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Just (l, cleanup) -> do
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l' <- catMaybes <$> mapM finishCheck l
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liftIO $ void cleanup
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return (Just l')
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loggedKeysFor' :: UUID -> Annex (Maybe ([Unchecked Key], IO Bool))
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loggedKeysFor' u = loggedKeys' isthere
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where
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isthere k = do
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us <- loggedLocations k
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let !there = u `elem` us
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return there
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{- This is much faster than loggedKeys. -}
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overLocationLogs :: v -> (Key -> [UUID] -> v -> Annex v) -> Annex v
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overLocationLogs v = overLocationLogs' v (flip const)
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overLocationLogs'
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:: v
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-> (Annex (Maybe (Key, RawFilePath, Maybe L.ByteString)) -> Annex v -> Annex v)
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-> (Key -> [UUID] -> v -> Annex v)
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-> Annex v
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overLocationLogs' iv discarder keyaction = do
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config <- Annex.getGitConfig
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clusters <- getClusters
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let getk = locationLogFileKey config
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let go v reader = reader >>= \case
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Just (k, f, content) -> discarder reader $ do
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-- precache to make checkDead fast, and also to
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-- make any accesses done in keyaction fast.
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maybe noop (Annex.Branch.precache f) content
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ifM (checkDead k)
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( go v reader
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, do
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!v' <- keyaction k (maybe [] (parseLoggedLocations clusters) content) v
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go v' reader
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)
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Nothing -> return v
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Annex.Branch.overBranchFileContents getk (go iv) >>= \case
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Just r -> return r
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Nothing -> giveup "This repository is read-only, and there are unmerged git-annex branches, which prevents operating on allu keys. (Set annex.merge-annex-branches to false to ignore the unmerged git-annex branches.)"
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