git-annex/Types/Remote.hs
Joey Hess 9e11699c76 connect existing meters to the transfer log for downloads
Most remotes have meters in their implementations of retrieveKeyFile
already. Simply hooking these up to the transfer log makes that information
available. Easy peasy.

This is particularly valuable information for encrypted remotes, which
otherwise bypass the assistant's polling of temp files, and so don't have
good progress bars yet.

Still some work to do here (see progressbars.mdwn changes), but this
is entirely an improvement from the lack of progress bars for encrypted
downloads.
2013-04-11 17:32:31 -04:00

93 lines
2.8 KiB
Haskell

{- git-annex remotes types
-
- Most things should not need this, using Types instead
-
- Copyright 2011 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Types.Remote where
import Data.Map as M
import Data.Ord
import qualified Git
import Types.Key
import Types.UUID
import Types.GitConfig
import Config.Cost
import Utility.Metered
type RemoteConfigKey = String
type RemoteConfig = M.Map RemoteConfigKey String
{- There are different types of remotes. -}
data RemoteTypeA a = RemoteType {
-- human visible type name
typename :: String,
-- enumerates remotes of this type
enumerate :: a [Git.Repo],
-- generates a remote of this type
generate :: Git.Repo -> UUID -> RemoteConfig -> RemoteGitConfig -> a (RemoteA a),
-- initializes or changes a remote
setup :: UUID -> RemoteConfig -> a RemoteConfig
}
instance Eq (RemoteTypeA a) where
x == y = typename x == typename y
{- A filename associated with a Key, for display to user. -}
type AssociatedFile = Maybe FilePath
{- An individual remote. -}
data RemoteA a = Remote {
-- each Remote has a unique uuid
uuid :: UUID,
-- each Remote has a human visible name
name :: String,
-- Remotes have a use cost; higher is more expensive
cost :: Cost,
-- Transfers a key to the remote.
storeKey :: Key -> AssociatedFile -> MeterUpdate -> a Bool,
-- Retrieves a key's contents to a file.
-- (The MeterUpdate does not need to be used if it retrieves
-- directly to the file, and not to an intermediate file.)
retrieveKeyFile :: Key -> AssociatedFile -> FilePath -> MeterUpdate -> a Bool,
-- retrieves a key's contents to a tmp file, if it can be done cheaply
retrieveKeyFileCheap :: Key -> FilePath -> a Bool,
-- removes a key's contents
removeKey :: Key -> a Bool,
-- Checks if a key is present in the remote; if the remote
-- cannot be accessed returns a Left error message.
hasKey :: Key -> a (Either String Bool),
-- Some remotes can check hasKey without an expensive network
-- operation.
hasKeyCheap :: Bool,
-- Some remotes can provide additional details for whereis.
whereisKey :: Maybe (Key -> a [String]),
-- a Remote has a persistent configuration store
config :: RemoteConfig,
-- git repo for the Remote
repo :: Git.Repo,
-- a Remote's configuration from git
gitconfig :: RemoteGitConfig,
-- a Remote can be assocated with a specific local filesystem path
localpath :: Maybe FilePath,
-- a Remote can be known to be readonly
readonly :: Bool,
-- a Remote can be globally available. (Ie, "in the cloud".)
globallyAvailable :: Bool,
-- the type of the remote
remotetype :: RemoteTypeA a
}
instance Show (RemoteA a) where
show remote = "Remote { name =\"" ++ name remote ++ "\" }"
-- two remotes are the same if they have the same uuid
instance Eq (RemoteA a) where
x == y = uuid x == uuid y
instance Ord (RemoteA a) where
compare = comparing uuid