952664641a
This makes it easier to build eg benchmarks of individual modules. May be that most of these PackageImports are not really necessary, dunno.
144 lines
3.8 KiB
Haskell
144 lines
3.8 KiB
Haskell
{- git-annex assistant monad
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-
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- Copyright 2012 Joey Hess <id@joeyh.name>
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-
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- Licensed under the GNU AGPL version 3 or higher.
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-}
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{-# LANGUAGE GeneralizedNewtypeDeriving, MultiParamTypeClasses #-}
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{-# LANGUAGE PackageImports #-}
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module Assistant.Monad (
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Assistant,
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AssistantData(..),
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newAssistantData,
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runAssistant,
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getAssistant,
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LiftAnnex,
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liftAnnex,
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(<~>),
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(<<~),
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asIO,
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asIO1,
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asIO2,
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ThreadName,
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debug,
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) where
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import "mtl" Control.Monad.Reader
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import qualified Control.Monad.Fail as Fail
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import Annex.Common hiding (debug)
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import Assistant.Types.ThreadedMonad
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import Assistant.Types.DaemonStatus
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import Assistant.Types.ScanRemotes
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import Assistant.Types.TransferQueue
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import Assistant.Types.TransferSlots
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import Assistant.Types.Pushes
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import Assistant.Types.BranchChange
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import Assistant.Types.Commits
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import Assistant.Types.Changes
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import Assistant.Types.RepoProblem
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import Assistant.Types.ThreadName
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import Assistant.Types.RemoteControl
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import Assistant.Types.CredPairCache
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import qualified Utility.Debug as Debug
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newtype Assistant a = Assistant { mkAssistant :: ReaderT AssistantData IO a }
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deriving (
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Monad,
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MonadIO,
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MonadReader AssistantData,
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MonadCatch,
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MonadThrow,
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MonadMask,
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Fail.MonadFail,
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Functor,
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Applicative
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)
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data AssistantData = AssistantData
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{ threadName :: ThreadName
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, threadState :: ThreadState
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, daemonStatusHandle :: DaemonStatusHandle
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, scanRemoteMap :: ScanRemoteMap
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, transferQueue :: TransferQueue
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, transferSlots :: TransferSlots
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, failedPushMap :: FailedPushMap
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, failedExportMap :: FailedPushMap
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, commitChan :: CommitChan
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, exportCommitChan :: CommitChan
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, changePool :: ChangePool
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, repoProblemChan :: RepoProblemChan
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, branchChangeHandle :: BranchChangeHandle
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, remoteControl :: RemoteControl
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, credPairCache :: CredPairCache
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}
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newAssistantData :: ThreadState -> DaemonStatusHandle -> IO AssistantData
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newAssistantData st dstatus = AssistantData
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<$> pure (ThreadName "main")
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<*> pure st
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<*> pure dstatus
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<*> newScanRemoteMap
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<*> newTransferQueue
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<*> newTransferSlots
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<*> newFailedPushMap
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<*> newFailedPushMap
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<*> newCommitChan
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<*> newCommitChan
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<*> newChangePool
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<*> newRepoProblemChan
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<*> newBranchChangeHandle
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<*> newRemoteControl
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<*> newCredPairCache
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runAssistant :: AssistantData -> Assistant a -> IO a
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runAssistant d a = runReaderT (mkAssistant a) d
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getAssistant :: (AssistantData -> a) -> Assistant a
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getAssistant = reader
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{- Using a type class for lifting into the annex monad allows
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- easily lifting to it from multiple different monads. -}
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class LiftAnnex m where
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liftAnnex :: Annex a -> m a
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{- Runs an action in the git-annex monad. Note that the same monad state
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- is shared among all assistant threads, so only one of these can run at
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- a time. Therefore, long-duration actions should be avoided. -}
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instance LiftAnnex Assistant where
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liftAnnex a = do
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st <- reader threadState
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liftIO $ runThreadState st a
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{- Runs an IO action, passing it an IO action that runs an Assistant action. -}
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(<~>) :: (IO a -> IO b) -> Assistant a -> Assistant b
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io <~> a = do
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d <- reader id
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liftIO $ io $ runAssistant d a
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{- Creates an IO action that will run an Assistant action when run. -}
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asIO :: Assistant a -> Assistant (IO a)
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asIO a = do
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d <- reader id
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return $ runAssistant d a
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asIO1 :: (a -> Assistant b) -> Assistant (a -> IO b)
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asIO1 a = do
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d <- reader id
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return $ \v -> runAssistant d $ a v
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asIO2 :: (a -> b -> Assistant c) -> Assistant (a -> b -> IO c)
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asIO2 a = do
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d <- reader id
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return $ \v1 v2 -> runAssistant d (a v1 v2)
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{- Runs an IO action on a selected field of the AssistantData. -}
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(<<~) :: (a -> IO b) -> (AssistantData -> a) -> Assistant b
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io <<~ v = reader v >>= liftIO . io
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debug :: [String] -> Assistant ()
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debug ws = do
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ThreadName name <- getAssistant threadName
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liftIO $ Debug.debug (Debug.DebugSource (encodeBS name)) (unwords ws)
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