75 lines
2.5 KiB
Haskell
75 lines
2.5 KiB
Haskell
{- Helpers for remotes using the git-annex P2P protocol.
|
|
-
|
|
- Copyright 2016-2020 Joey Hess <id@joeyh.name>
|
|
-
|
|
- Licensed under the GNU AGPL version 3 or higher.
|
|
-}
|
|
|
|
{-# LANGUAGE RankNTypes #-}
|
|
|
|
module Remote.Helper.P2P where
|
|
|
|
import Annex.Common
|
|
import qualified P2P.Protocol as P2P
|
|
import P2P.IO
|
|
import Types.Remote
|
|
import Annex.Content
|
|
import Messages.Progress
|
|
import Utility.Metered
|
|
import Types.NumCopies
|
|
|
|
import Control.Concurrent
|
|
|
|
-- Runs a Proto action using a connection it sets up.
|
|
type ProtoRunner a = P2P.Proto a -> Annex (Maybe a)
|
|
|
|
-- Runs a Proto action using a ClosableConnection.
|
|
type ProtoConnRunner c = forall a. P2P.Proto a -> ClosableConnection c -> Annex (ClosableConnection c, Maybe a)
|
|
|
|
-- Runs an Annex action with a connection from the pool, adding it back to
|
|
-- the pool when done.
|
|
type WithConn a c = (ClosableConnection c -> Annex (ClosableConnection c, a)) -> Annex a
|
|
|
|
store :: (MeterUpdate -> ProtoRunner Bool) -> Key -> AssociatedFile -> MeterUpdate -> Annex ()
|
|
store runner k af p = do
|
|
let sizer = KeySizer k (fmap fst <$> prepSendAnnex k)
|
|
metered (Just p) sizer $ \_ p' ->
|
|
runner p' (P2P.put k af p') >>= \case
|
|
Just True -> return ()
|
|
Just False -> giveup "transfer failed"
|
|
Nothing -> remoteUnavail
|
|
|
|
retrieve :: (MeterUpdate -> ProtoRunner (Bool, Verification)) -> Key -> AssociatedFile -> FilePath -> MeterUpdate -> Annex Verification
|
|
retrieve runner k af dest p =
|
|
metered (Just p) k $ \m p' ->
|
|
runner p' (P2P.get dest k af m p') >>= \case
|
|
Just (True, v) -> return v
|
|
Just (False, _) -> giveup "transfer failed"
|
|
Nothing -> remoteUnavail
|
|
|
|
remove :: ProtoRunner Bool -> Key -> Annex ()
|
|
remove runner k = runner (P2P.remove k) >>= \case
|
|
Just True -> return ()
|
|
Just False -> giveup "removing content from remote failed"
|
|
Nothing -> remoteUnavail
|
|
|
|
checkpresent :: ProtoRunner Bool -> Key -> Annex Bool
|
|
checkpresent runner k = maybe remoteUnavail return =<< runner (P2P.checkPresent k)
|
|
|
|
lock :: WithConn a c -> ProtoConnRunner c -> UUID -> Key -> (VerifiedCopy -> Annex a) -> Annex a
|
|
lock withconn connrunner u k callback = withconn $ \conn -> do
|
|
connv <- liftIO $ newMVar conn
|
|
let runproto d p = do
|
|
c <- liftIO $ takeMVar connv
|
|
(c', mr) <- connrunner p c
|
|
liftIO $ putMVar connv c'
|
|
return (fromMaybe d mr)
|
|
r <- P2P.lockContentWhile runproto k go
|
|
conn' <- liftIO $ takeMVar connv
|
|
return (conn', r)
|
|
where
|
|
go False = giveup "can't lock content"
|
|
go True = withVerifiedCopy LockedCopy u (return True) callback
|
|
|
|
remoteUnavail :: a
|
|
remoteUnavail = giveup "can't connect to remote"
|