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|
{- git remotes using the git-annex P2P protocol
-
- Copyright 2016-2018 Joey Hess <id@joeyh.name>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Remote.P2P (
remote,
chainGen
) where
import Annex.Common
import qualified Annex
import qualified P2P.Protocol as P2P
import P2P.Address
import P2P.Annex
import P2P.IO
import P2P.Auth
import Types.Remote
import Types.GitConfig
import qualified Git
import Annex.UUID
import Config
import Config.Cost
import Remote.Helper.Git
import Remote.Helper.Export
import Remote.Helper.P2P
import Utility.AuthToken
import Control.Concurrent.STM
remote :: RemoteType
remote = RemoteType
{ typename = "p2p"
-- Remote.Git takes care of enumerating P2P remotes,
-- and will call chainGen on them.
, enumerate = const (return [])
, generate = \_ _ _ _ -> return Nothing
, setup = error "P2P remotes are set up using git-annex p2p"
, exportSupported = exportUnsupported
}
chainGen :: P2PAddress -> Git.Repo -> UUID -> RemoteConfig -> RemoteGitConfig -> Annex (Maybe Remote)
chainGen addr r u c gc = do
connpool <- mkConnectionPool
cst <- remoteCost gc veryExpensiveRemoteCost
let protorunner = runProto u addr connpool
let withconn = withConnection u addr connpool
let this = Remote
{ uuid = u
, cost = cst
, name = Git.repoDescribe r
, storeKey = store protorunner
, retrieveKeyFile = retrieve protorunner
, retrieveKeyFileCheap = \_ _ _ -> return False
, removeKey = remove protorunner
, lockContent = Just $ lock withconn runProtoConn u
, checkPresent = checkpresent protorunner
, checkPresentCheap = False
, exportActions = exportUnsupported
, whereisKey = Nothing
, remoteFsck = Nothing
, repairRepo = Nothing
, config = c
, localpath = Nothing
, repo = r
, gitconfig = gc { remoteGitConfig = extractGitConfig r }
, readonly = False
, availability = GloballyAvailable
, remotetype = remote
, mkUnavailable = return Nothing
, getInfo = gitRepoInfo this
, claimUrl = Nothing
, checkUrl = Nothing
}
return (Just this)
-- | A connection to the peer, which can be closed.
type Connection = ClosableConnection P2PConnection
type ConnectionPool = TVar [Connection]
mkConnectionPool :: Annex ConnectionPool
mkConnectionPool = liftIO $ newTVarIO []
-- Runs the Proto action.
runProto :: UUID -> P2PAddress -> ConnectionPool -> P2P.Proto a -> Annex (Maybe a)
runProto u addr connpool a = withConnection u addr connpool (runProtoConn a)
runProtoConn :: P2P.Proto a -> Connection -> Annex (Connection, Maybe a)
runProtoConn _ ClosedConnection = return (ClosedConnection, Nothing)
runProtoConn a (OpenConnection conn) = do
v <- runFullProto Client conn a
-- When runFullProto fails, the connection is no longer usable,
-- so close it.
case v of
Left e -> do
warning $ "Lost connection to peer (" ++ e ++ ")"
liftIO $ closeConnection conn
return (ClosedConnection, Nothing)
Right r -> return (OpenConnection conn, Just r)
-- Uses an open connection if one is available in the ConnectionPool;
-- otherwise opens a new connection.
--
-- Once the action is done, the connection is added back to the
-- ConnectionPool, unless it's no longer open.
withConnection :: UUID -> P2PAddress -> ConnectionPool -> (Connection -> Annex (Connection, a)) -> Annex a
withConnection u addr connpool a = bracketOnError get cache go
where
get = do
mc <- liftIO $ atomically $ do
l <- readTVar connpool
case l of
[] -> do
writeTVar connpool []
return Nothing
(c:cs) -> do
writeTVar connpool cs
return (Just c)
maybe (openConnection u addr) return mc
cache ClosedConnection = return ()
cache conn = liftIO $ atomically $ modifyTVar' connpool (conn:)
go conn = do
(conn', r) <- a conn
cache conn'
return r
openConnection :: UUID -> P2PAddress -> Annex Connection
openConnection u addr = do
g <- Annex.gitRepo
v <- liftIO $ tryNonAsync $ connectPeer g addr
case v of
Right conn -> do
myuuid <- getUUID
authtoken <- fromMaybe nullAuthToken
<$> loadP2PRemoteAuthToken addr
res <- liftIO $ runNetProto conn $
P2P.auth myuuid authtoken
case res of
Right (Just theiruuid)
| u == theiruuid -> return (OpenConnection conn)
| otherwise -> do
liftIO $ closeConnection conn
warning "Remote peer uuid seems to have changed."
return ClosedConnection
Right Nothing -> do
warning "Unable to authenticate with peer."
liftIO $ closeConnection conn
return ClosedConnection
Left e -> do
warning $ "Problem communicating with peer. (" ++ e ++ ")"
liftIO $ closeConnection conn
return ClosedConnection
Left e -> do
warning $ "Unable to connect to peer. (" ++ show e ++ ")"
return ClosedConnection
|
