basic support for git-remote-daemon protocol

RemoteDaemon/Types.hs

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+{- git-remote-daemon data types.
+ -
+ - Copyright 2014 Joey Hess <joey@kitenet.net>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+{-# LANGUAGE TypeSynonymInstances, FlexibleInstances #-}
+{-# OPTIONS_GHC -fno-warn-orphans #-}
+
+module RemoteDaemon.Types where
+
+import Common.Annex
+import qualified Git.Types as Git
+import qualified Utility.SimpleProtocol as Proto
+
+import Control.Concurrent.STM
+
+-- Messages that the daemon emits.
+data Emitted
+	= CHANGED RemoteName RefList
+	| STATUS RemoteName UserMessage
+	| ERROR RemoteName UserMessage
+
+-- Messages that the deamon consumes.
+data Consumed
+	= PAUSE
+	| RESUME
+	| PUSH RemoteName
+	| RELOAD
+
+type RemoteName = String
+type UserMessage = String
+type RefList = [Git.Ref]
+
+instance Proto.Sendable Emitted where
+	formatMessage (CHANGED remote refs) =
+		["CHANGED"
+		, Proto.serialize remote
+		, Proto.serialize refs
+		]
+	formatMessage (STATUS remote msg) =
+		["STATUS"
+		, Proto.serialize remote
+		, Proto.serialize msg
+		]
+	formatMessage (ERROR remote msg) =
+		["ERROR"
+		, Proto.serialize remote
+		, Proto.serialize msg
+		]
+
+instance Proto.Sendable Consumed where
+	formatMessage PAUSE = ["PAUSE"]
+	formatMessage RESUME = ["RESUME"]
+	formatMessage (PUSH remote) = ["PUSH", Proto.serialize remote]
+	formatMessage RELOAD = ["RELOAD"]
+
+instance Proto.Receivable Emitted where
+	parseCommand "CHANGED" = Proto.parse2 CHANGED
+	parseCommand "STATUS" = Proto.parse2 STATUS
+	parseCommand "ERROR" = Proto.parse2 ERROR
+	parseCommand _ = Proto.parseFail
+
+instance Proto.Receivable Consumed where
+	parseCommand "PAUSE" = Proto.parse0 PAUSE
+	parseCommand "RESUME" = Proto.parse0 RESUME
+	parseCommand "PUSH" = Proto.parse1 PUSH
+	parseCommand "RELOAD" = Proto.parse0 RELOAD
+	parseCommand _ = Proto.parseFail
+
+instance Proto.Serializable [Char] where
+	serialize = id
+	deserialize = Just
+
+instance Proto.Serializable RefList where
+	serialize = unwords . map Git.fromRef
+	deserialize = Just . map Git.Ref . words