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{- External special remote data types.
-
- Copyright 2013 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
{-# LANGUAGE FlexibleInstances, TypeSynonymInstances #-}
{-# OPTIONS_GHC -fno-warn-orphans #-}
module Remote.External.Types (
External(..),
newExternal,
ExternalType,
ExternalLock,
withExternalLock,
ExternalState(..),
PrepareStatus(..),
Proto.parseMessage,
Proto.Sendable(..),
Proto.Receivable(..),
Request(..),
needsPREPARE,
Response(..),
RemoteRequest(..),
RemoteResponse(..),
AsyncMessage(..),
ErrorMsg,
Setting,
ProtocolVersion,
supportedProtocolVersions,
) where
import Common.Annex
import Types.Key (file2key, key2file)
import Types.StandardGroups (PreferredContentExpression)
import Utility.Metered (BytesProcessed(..))
import Logs.Transfer (Direction(..))
import Config.Cost (Cost)
import Types.Remote (RemoteConfig)
import Types.Availability (Availability(..))
import Utility.Url (URLString)
import qualified Utility.SimpleProtocol as Proto
import Control.Concurrent.STM
-- If the remote is not yet running, the ExternalState TMVar is empty.
data External = External
{ externalType :: ExternalType
, externalUUID :: UUID
-- Empty until the remote is running.
, externalState :: TMVar ExternalState
-- Empty when a remote is in use.
, externalLock :: TMVar ExternalLock
-- Never left empty.
, externalConfig :: TMVar RemoteConfig
}
newExternal :: ExternalType -> UUID -> RemoteConfig -> Annex External
newExternal externaltype u c = liftIO $ External
<$> pure externaltype
<*> pure u
<*> atomically newEmptyTMVar
<*> atomically (newTMVar ExternalLock)
<*> atomically (newTMVar c)
type ExternalType = String
data ExternalState = ExternalState
{ externalSend :: Handle
, externalReceive :: Handle
, externalPid :: ProcessHandle
, externalPrepared :: PrepareStatus
}
data PrepareStatus = Unprepared | Prepared | FailedPrepare ErrorMsg
-- Constructor is not exported, and only created by newExternal.
data ExternalLock = ExternalLock
withExternalLock :: External -> (ExternalLock -> Annex a) -> Annex a
withExternalLock external = bracketIO setup cleanup
where
setup = atomically $ takeTMVar v
cleanup = atomically . putTMVar v
v = externalLock external
-- Messages that can be sent to the external remote to request it do something.
data Request
= PREPARE
| INITREMOTE
| GETCOST
| GETAVAILABILITY
| CLAIMURL URLString
| CHECKURL URLString
| TRANSFER Direction Key FilePath
| CHECKPRESENT Key
| REMOVE Key
deriving (Show)
-- Does PREPARE need to have been sent before this request?
needsPREPARE :: Request -> Bool
needsPREPARE PREPARE = False
needsPREPARE INITREMOTE = False
needsPREPARE _ = True
instance Proto.Sendable Request where
formatMessage PREPARE = ["PREPARE"]
formatMessage INITREMOTE = ["INITREMOTE"]
formatMessage GETCOST = ["GETCOST"]
formatMessage GETAVAILABILITY = ["GETAVAILABILITY"]
formatMessage (CLAIMURL url) = [ "CLAIMURL", Proto.serialize url ]
formatMessage (CHECKURL url) = [ "CHECKURL", Proto.serialize url ]
formatMessage (TRANSFER direction key file) =
[ "TRANSFER"
, Proto.serialize direction
, Proto.serialize key
, Proto.serialize file
]
formatMessage (CHECKPRESENT key) = [ "CHECKPRESENT", Proto.serialize key ]
formatMessage (REMOVE key) = [ "REMOVE", Proto.serialize key ]
-- Responses the external remote can make to requests.
data Response
= PREPARE_SUCCESS
| PREPARE_FAILURE ErrorMsg
| TRANSFER_SUCCESS Direction Key
| TRANSFER_FAILURE Direction Key ErrorMsg
| CHECKPRESENT_SUCCESS Key
| CHECKPRESENT_FAILURE Key
| CHECKPRESENT_UNKNOWN Key ErrorMsg
| REMOVE_SUCCESS Key
| REMOVE_FAILURE Key ErrorMsg
| COST Cost
| AVAILABILITY Availability
| INITREMOTE_SUCCESS
| INITREMOTE_FAILURE ErrorMsg
| CLAIMURL_SUCCESS
| CLAIMURL_AS FilePath
| CLAIMURL_FAILURE
| CHECKURL_SIZE Size
| CHECKURL_SIZEUNKNOWN
| CHECKURL_FAILURE ErrorMsg
| UNSUPPORTED_REQUEST
deriving (Show)
instance Proto.Receivable Response where
parseCommand "PREPARE-SUCCESS" = Proto.parse0 PREPARE_SUCCESS
parseCommand "PREPARE-FAILURE" = Proto.parse1 PREPARE_FAILURE
parseCommand "TRANSFER-SUCCESS" = Proto.parse2 TRANSFER_SUCCESS
parseCommand "TRANSFER-FAILURE" = Proto.parse3 TRANSFER_FAILURE
parseCommand "CHECKPRESENT-SUCCESS" = Proto.parse1 CHECKPRESENT_SUCCESS
parseCommand "CHECKPRESENT-FAILURE" = Proto.parse1 CHECKPRESENT_FAILURE
parseCommand "CHECKPRESENT-UNKNOWN" = Proto.parse2 CHECKPRESENT_UNKNOWN
parseCommand "REMOVE-SUCCESS" = Proto.parse1 REMOVE_SUCCESS
parseCommand "REMOVE-FAILURE" = Proto.parse2 REMOVE_FAILURE
parseCommand "COST" = Proto.parse1 COST
parseCommand "AVAILABILITY" = Proto.parse1 AVAILABILITY
parseCommand "INITREMOTE-SUCCESS" = Proto.parse0 INITREMOTE_SUCCESS
parseCommand "INITREMOTE-FAILURE" = Proto.parse1 INITREMOTE_FAILURE
parseCommand "CLAIMURL-SUCCESS" = Proto.parse0 CLAIMURL_SUCCESS
parseCommand "CLAIMURL-AS" = Proto.parse1 CLAIMURL_AS
parseCommand "CLAIMURL-FAILURE" = Proto.parse0 CLAIMURL_FAILURE
parseCommand "CHECKURL-SIZE" = Proto.parse1 CHECKURL_SIZE
parseCommand "CHECKURL-SIZEUNKNOWN" = Proto.parse0 CHECKURL_SIZEUNKNOWN
parseCommand "CHECKURL-FAILURE" = Proto.parse1 CHECKURL_FAILURE
parseCommand "UNSUPPORTED-REQUEST" = Proto.parse0 UNSUPPORTED_REQUEST
parseCommand _ = Proto.parseFail
-- Requests that the external remote can send at any time it's in control.
data RemoteRequest
= VERSION ProtocolVersion
| PROGRESS BytesProcessed
| DIRHASH Key
| SETCONFIG Setting String
| GETCONFIG Setting
| SETCREDS Setting String String
| GETCREDS Setting
| GETUUID
| GETGITDIR
| SETWANTED PreferredContentExpression
| GETWANTED
| SETSTATE Key String
| GETSTATE Key
| SETURLPRESENT Key URLString
| SETURLMISSING Key URLString
| GETURLS Key String
| DEBUG String
deriving (Show)
instance Proto.Receivable RemoteRequest where
parseCommand "VERSION" = Proto.parse1 VERSION
parseCommand "PROGRESS" = Proto.parse1 PROGRESS
parseCommand "DIRHASH" = Proto.parse1 DIRHASH
parseCommand "SETCONFIG" = Proto.parse2 SETCONFIG
parseCommand "GETCONFIG" = Proto.parse1 GETCONFIG
parseCommand "SETCREDS" = Proto.parse3 SETCREDS
parseCommand "GETCREDS" = Proto.parse1 GETCREDS
parseCommand "GETUUID" = Proto.parse0 GETUUID
parseCommand "GETGITDIR" = Proto.parse0 GETGITDIR
parseCommand "SETWANTED" = Proto.parse1 SETWANTED
parseCommand "GETWANTED" = Proto.parse0 GETWANTED
parseCommand "SETSTATE" = Proto.parse2 SETSTATE
parseCommand "GETSTATE" = Proto.parse1 GETSTATE
parseCommand "SETURLPRESENT" = Proto.parse2 SETURLPRESENT
parseCommand "SETURLMISSING" = Proto.parse2 SETURLMISSING
parseCommand "GETURLS" = Proto.parse2 GETURLS
parseCommand "DEBUG" = Proto.parse1 DEBUG
parseCommand _ = Proto.parseFail
-- Responses to RemoteRequest.
data RemoteResponse
= VALUE String
| CREDS String String
deriving (Show)
instance Proto.Sendable RemoteResponse where
formatMessage (VALUE s) = [ "VALUE", Proto.serialize s ]
formatMessage (CREDS login password) = [ "CREDS", Proto.serialize login, Proto.serialize password ]
-- Messages that can be sent at any time by either git-annex or the remote.
data AsyncMessage
= ERROR ErrorMsg
deriving (Show)
instance Proto.Sendable AsyncMessage where
formatMessage (ERROR err) = [ "ERROR", Proto.serialize err ]
instance Proto.Receivable AsyncMessage where
parseCommand "ERROR" = Proto.parse1 ERROR
parseCommand _ = Proto.parseFail
-- Data types used for parameters when communicating with the remote.
-- All are serializable.
type ErrorMsg = String
type Setting = String
type ProtocolVersion = Int
type Size = Integer
supportedProtocolVersions :: [ProtocolVersion]
supportedProtocolVersions = [1]
instance Proto.Serializable Direction where
serialize Upload = "STORE"
serialize Download = "RETRIEVE"
deserialize "STORE" = Just Upload
deserialize "RETRIEVE" = Just Download
deserialize _ = Nothing
instance Proto.Serializable Key where
serialize = key2file
deserialize = file2key
instance Proto.Serializable [Char] where
serialize = id
deserialize = Just
instance Proto.Serializable ProtocolVersion where
serialize = show
deserialize = readish
instance Proto.Serializable Cost where
serialize = show
deserialize = readish
instance Proto.Serializable Size where
serialize = show
deserialize = readish
instance Proto.Serializable Availability where
serialize GloballyAvailable = "GLOBAL"
serialize LocallyAvailable = "LOCAL"
deserialize "GLOBAL" = Just GloballyAvailable
deserialize "LOCAL" = Just LocallyAvailable
deserialize _ = Nothing
instance Proto.Serializable BytesProcessed where
serialize (BytesProcessed n) = show n
deserialize = BytesProcessed <$$> readish
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