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|
{- External special remote interface.
-
- Copyright 2013 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
{-# LANGUAGE FlexibleInstances, TypeSynonymInstances #-}
module Remote.External (remote) where
import Data.Char
import Common.Annex
import Types.Remote
import Types.Key
import qualified Git
import Config
import Remote.Helper.Special
import Remote.Helper.Encryptable
import Crypto
import Utility.Metered
import Logs.Transfer
import Config.Cost
remote :: RemoteType
remote = RemoteType {
typename = "hook",
enumerate = findSpecialRemotes "hooktype",
generate = gen,
setup = undefined
}
gen :: Git.Repo -> UUID -> RemoteConfig -> RemoteGitConfig -> Annex (Maybe Remote)
gen r u c gc = do
cst <- remoteCost gc expensiveRemoteCost
return $ Just $ encryptableRemote c
(storeEncrypted $ getGpgEncParams (c,gc))
retrieveEncrypted
Remote {
uuid = u,
cost = cst,
name = Git.repoDescribe r,
storeKey = store,
retrieveKeyFile = retrieve,
retrieveKeyFileCheap = retrieveCheap,
removeKey = remove,
hasKey = checkPresent r,
hasKeyCheap = False,
whereisKey = Nothing,
remoteFsck = Nothing,
repairRepo = Nothing,
config = c,
localpath = Nothing,
repo = r,
gitconfig = gc,
readonly = False,
globallyAvailable = False,
remotetype = remote
}
store :: Key -> AssociatedFile -> MeterUpdate -> Annex Bool
store k _f _p = undefined
storeEncrypted :: [CommandParam] -> (Cipher, Key) -> Key -> MeterUpdate -> Annex Bool
storeEncrypted gpgOpts (cipher, enck) k _p = undefined
retrieve :: Key -> AssociatedFile -> FilePath -> MeterUpdate -> Annex Bool
retrieve k _f d _p = undefined
retrieveCheap :: Key -> FilePath -> Annex Bool
retrieveCheap _ _ = undefined
retrieveEncrypted :: (Cipher, Key) -> Key -> FilePath -> MeterUpdate -> Annex Bool
retrieveEncrypted (cipher, enck) _ f _p = undefined
remove :: Key -> Annex Bool
remove k = undefined
checkPresent :: Git.Repo -> Key -> Annex (Either String Bool)
checkPresent r k = undefined
-- Messages that git-annex can send.
class Sendable m where
formatMessage :: m -> [String]
-- Messages that git-annex can receive.
class Receivable m where
-- Passed the first word of the message, returns
-- a Parser that can be be fed the rest of the message to generate
-- the value.
parseCommand :: String -> Parser m
parseMessage :: (Receivable m) => String -> Maybe m
parseMessage s = parseCommand command rest
where
(command, rest) = splitWord s
-- Messages that can be sent to the external remote to request it do something.
data Request
= PREPARE
| INITREMOTE
| GETCOST
| TRANSFER Direction Key FilePath
| CHECKPRESENT Key
| REMOVE Key
deriving (Show)
instance Sendable Request where
formatMessage PREPARE = ["PREPARE"]
formatMessage INITREMOTE = ["INITREMOTE"]
formatMessage GETCOST = ["GETCOST"]
formatMessage (TRANSFER direction key file) =
[ "TRANSFER", serialize direction, serialize key, serialize file ]
formatMessage (CHECKPRESENT key) = [ "CHECKPRESENT", serialize key ]
formatMessage (REMOVE key) = [ "REMOVE", serialize key ]
-- Responses the external remote can make to requests.
data Response
= PREPARE_SUCCESS
| 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
| COST_UNKNOWN
| INITREMOTE_SUCCESS
| INITREMOTE_FAILURE ErrorMsg
| UNKNOWN_REQUEST
deriving (Show)
instance Receivable Response where
parseCommand "PREPARE-SUCCESS" = parse0 PREPARE_SUCCESS
parseCommand "TRANSFER-SUCCESS" = parse2 TRANSFER_SUCCESS
parseCommand "TRANSFER-FAILURE" = parse3 TRANSFER_FAILURE
parseCommand "CHECKPRESENT-SUCCESS" = parse1 CHECKPRESENT_SUCCESS
parseCommand "CHECKPRESENT-FAILURE" = parse1 CHECKPRESENT_FAILURE
parseCommand "CHECKPRESENT-UNKNOWN" = parse2 CHECKPRESENT_UNKNOWN
parseCommand "REMOVE-SUCCESS" = parse1 REMOVE_SUCCESS
parseCommand "REMOVE-FAILURE" = parse2 REMOVE_FAILURE
parseCommand "COST" = parse1 COST
parseCommand "COST_UNKNOWN" = parse0 COST_UNKNOWN
parseCommand "INITREMOTE-SUCCESS" = parse0 INITREMOTE_SUCCESS
parseCommand "INITREMOTE-FAILURE" = parse1 INITREMOTE_FAILURE
parseCommand "UNKNOWN-REQUEST" = parse0 UNKNOWN_REQUEST
parseCommand _ = parseFail
-- Requests that the external remote can send at any time it's in control.
data RemoteRequest
= VERSION Int
| PROGRESS Direction Key Int
| DIRHASH Key
| SETCONFIG Setting String
| GETCONFIG Setting
| SETSTATE Key String
| GETSTATE Key
deriving (Show)
instance Receivable RemoteRequest where
parseCommand "VERSION" = parse1 VERSION
parseCommand "PROGRESS" = parse3 PROGRESS
parseCommand "DIRHASH" = parse1 DIRHASH
parseCommand "SETCONFIG" = parse2 SETCONFIG
parseCommand "GETCONFIG" = parse1 GETCONFIG
parseCommand "SETSTATE" = parse2 SETSTATE
parseCommand "GETSTATE" = parse1 GETSTATE
parseCommand _ = parseFail
-- Responses to RemoteRequest.
data RemoteResponse
= VALUE String
deriving (Show)
instance Sendable RemoteResponse where
formatMessage (VALUE s) = [ "VALUE", serialize s ]
-- Messages that can be sent at any time by either git-annex or the remote.
data AsyncMessages
= ERROR ErrorMsg
deriving (Show)
instance Sendable AsyncMessages where
formatMessage (ERROR err) = [ "ERROR", serialize err ]
instance Receivable AsyncMessages where
parseCommand "ERROR" = parse1 ERROR
parseCommand _ = parseFail
-- Data types used for parameters when communicating with the remote.
-- All are serializable.
type ErrorMsg = String
type Setting = String
class Serializable a where
serialize :: a -> String
deserialize :: String -> Maybe a
instance Serializable Direction where
serialize Upload = "STORE"
serialize Download = "RETRIEVE"
deserialize "STORE" = Just Upload
deserialize "RETRIEVE" = Just Download
deserialize _ = Nothing
instance Serializable Key where
serialize = key2file
deserialize = file2key
instance Serializable [Char] where
serialize = id
deserialize = Just
instance Serializable Cost where
serialize = show
deserialize = readish
instance Serializable Int where
serialize = show
deserialize = readish
{- Parsing the parameters of messages. Using the right parseN ensures
- that the string is split into exactly the requested number of words,
- which allows the last parameter of a message to contain arbitrary
- whitespace, etc, without needing any special quoting.
-}
type Parser a = String -> Maybe a
parseFail :: Parser a
parseFail _ = Nothing
parse0 :: a -> Parser a
parse0 mk "" = Just mk
parse0 _ _ = Nothing
parse1 :: Serializable p1 => (p1 -> a) -> Parser a
parse1 mk p1 = mk <$> deserialize p1
parse2 :: (Serializable p1, Serializable p2) => (p1 -> p2 -> a) -> Parser a
parse2 mk s = mk <$> deserialize p1 <*> deserialize p2
where
(p1, p2) = splitWord s
parse3 :: (Serializable p1, Serializable p2, Serializable p3) => (p1 -> p2 -> p3 -> a) -> Parser a
parse3 mk s = mk <$> deserialize p1 <*> deserialize p2 <*> deserialize p3
where
(p1, rest) = splitWord s
(p2, p3) = splitWord rest
splitWord :: String -> (String, String)
splitWord = separate isSpace
|