162 lines
4.3 KiB
Haskell
162 lines
4.3 KiB
Haskell
{- git-annex command-line JSON output and input
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-
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- Copyright 2011-2016 Joey Hess <id@joeyh.name>
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-
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- Licensed under the GNU GPL version 3 or higher.
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-}
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{-# LANGUAGE OverloadedStrings, GADTs #-}
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module Messages.JSON (
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JSONBuilder,
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JSONChunk(..),
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emit,
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none,
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start,
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end,
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note,
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add,
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complete,
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progress,
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DualDisp(..),
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ObjectMap(..),
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JSONActionItem(..),
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) where
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import Data.Aeson
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import Control.Applicative
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import qualified Data.Map as M
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import qualified Data.Text as T
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import qualified Data.ByteString.Lazy as B
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import qualified Data.HashMap.Strict as HM
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import System.IO
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import System.IO.Unsafe (unsafePerformIO)
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import Control.Concurrent
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import Data.Maybe
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import Data.Monoid
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import Prelude
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import Types.Key
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import Utility.Metered
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import Utility.Percentage
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-- A global lock to avoid concurrent threads emitting json at the same time.
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{-# NOINLINE emitLock #-}
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emitLock :: MVar ()
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emitLock = unsafePerformIO $ newMVar ()
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emit :: Object -> IO ()
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emit o = do
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takeMVar emitLock
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B.hPut stdout (encode o)
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putStr "\n"
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putMVar emitLock ()
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-- Building up a JSON object can be done by first using start,
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-- then add and note any number of times, and finally complete.
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type JSONBuilder = Maybe (Object, Bool) -> Maybe (Object, Bool)
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none :: JSONBuilder
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none = id
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start :: String -> Maybe FilePath -> Maybe Key -> JSONBuilder
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start command file key _ = Just (o, False)
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where
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Object o = toJSON $ JSONActionItem
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{ itemCommand = Just command
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, itemKey = key
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, itemFile = file
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, itemAdded = Nothing
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}
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end :: Bool -> JSONBuilder
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end b (Just (o, _)) = Just (HM.insert "success" (toJSON b) o, True)
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end _ Nothing = Nothing
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note :: String -> JSONBuilder
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note s (Just (o, e)) = Just (HM.insert "note" (toJSON s) o, e)
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note _ Nothing = Nothing
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data JSONChunk v where
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AesonObject :: Object -> JSONChunk Object
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JSONChunk :: ToJSON v => [(String, v)] -> JSONChunk [(String, v)]
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add :: JSONChunk v -> JSONBuilder
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add v (Just (o, e)) = Just (HM.union o' o, e)
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where
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Object o' = case v of
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AesonObject ao -> Object ao
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JSONChunk l -> object (map mkPair l)
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mkPair (s, d) = (T.pack s, toJSON d)
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add _ Nothing = Nothing
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complete :: JSONChunk v -> JSONBuilder
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complete v _ = add v (Just (HM.empty, True))
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-- Show JSON formatted progress, including the current state of the JSON
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-- object for the action being performed.
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progress :: Maybe Object -> Maybe Integer -> BytesProcessed -> IO ()
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progress maction msize bytesprocessed = emit $ case maction of
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Just action -> HM.insert "action" (Object action) o
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Nothing -> o
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where
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n = fromBytesProcessed bytesprocessed :: Integer
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Object o = case msize of
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Just size -> object
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[ "byte-progress" .= n
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, "percent-progress" .= showPercentage 2 (percentage size n)
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, "total-size" .= size
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]
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Nothing -> object
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[ "byte-progress" .= n ]
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-- A value that can be displayed either normally, or as JSON.
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data DualDisp = DualDisp
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{ dispNormal :: String
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, dispJson :: String
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}
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instance ToJSON DualDisp where
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toJSON = toJSON . dispJson
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instance Show DualDisp where
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show = dispNormal
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-- A Map that is serialized to JSON as an object, with each key being a
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-- field of the object. This is different from Aeson's normal
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-- serialization of Map, which uses "[key, value]".
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data ObjectMap a = ObjectMap { fromObjectMap :: M.Map String a }
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instance ToJSON a => ToJSON (ObjectMap a) where
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toJSON (ObjectMap m) = object $ map go $ M.toList m
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where
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go (k, v) = (T.pack k, toJSON v)
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-- An item that a git-annex command acts on, and displays a JSON object about.
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data JSONActionItem a = JSONActionItem
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{ itemCommand :: Maybe String
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, itemKey :: Maybe Key
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, itemFile :: Maybe FilePath
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, itemAdded :: Maybe a -- for additional fields added by `add`
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}
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deriving (Show)
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instance ToJSON (JSONActionItem a) where
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toJSON i = object $ catMaybes
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[ Just $ "command" .= itemCommand i
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, case itemKey i of
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Nothing -> Nothing
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Just k -> Just $ "key" .= toJSON k
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, Just $ "file" .= itemFile i
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-- itemAdded is not included; must be added later by 'add'
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]
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instance FromJSON a => FromJSON (JSONActionItem a) where
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parseJSON (Object v) = JSONActionItem
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<$> (v .:? "command")
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<*> (maybe (return Nothing) parseJSON =<< (v .:? "key"))
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<*> (v .:? "file")
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<*> parseadded
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where
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parseadded = (Just <$> parseJSON (Object v)) <|> return Nothing
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parseJSON _ = mempty
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