325 lines
12 KiB
Haskell
325 lines
12 KiB
Haskell
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{-# LANGUAGE GADTs #-}
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--------------------------------------------------------------------------------
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-- | Functions for handling dependencies
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module XMonad.Internal.DependencyX where
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import Control.Monad.IO.Class
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import Control.Monad.Identity
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-- import Data.Aeson
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import Data.Bifunctor
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import Data.Either
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import Data.List (find)
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import Data.Maybe
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-- import qualified Data.Text as T
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import DBus
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import DBus.Client
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import DBus.Internal
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import qualified DBus.Introspection as I
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import System.Directory (findExecutable, readable, writable)
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import System.Environment
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import System.Exit
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import XMonad.Core (X, io)
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import XMonad.Internal.IO
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import XMonad.Internal.Process
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import XMonad.Internal.Shell
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--------------------------------------------------------------------------------
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-- | Feature
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data AnyFeature p = FX (FeatureX p) | FIO (FeatureIO p)
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type FeatureX p = Feature (X ()) Tree p
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type FeatureIO p = Feature (IO ()) Tree p
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data Feature a t p = Feature (FeatureData a t p) (Feature a t p)
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| NoFeature
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| ConstFeature a
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printMsgs :: LogLevel -> [Msg] -> IO ()
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printMsgs lvl ms = do
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pn <- getProgName
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mapM_ (printMsg pn lvl) ms
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printMsg :: String -> LogLevel -> Msg -> IO ()
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printMsg pname lvl (Msg ml mn msg)
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| lvl > ml = putStrLn $ unwords [bracket pname, bracket mn, msg]
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| otherwise = skip
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where
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bracket s = "[" ++ s ++ "]"
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-- | Given a feature, return a monadic action if all dependencies are satisfied,
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-- else Nothing (and print errors)
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evalFeature :: Feature a ResultTree p -> ([Msg], Maybe a)
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evalFeature (ConstFeature x) = ([], Just x)
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evalFeature NoFeature = return Nothing
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evalFeature (Feature f alt) =
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either (\es -> first (++es) $ evalFeature alt) (\a -> ([], Just a))
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$ evalFeatureData f
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--------------------------------------------------------------------------------
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-- | Feature Data
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data FeatureData a t p = FeatureData
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{ fdTree :: ActionTree a t p
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, fdName :: String
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, fdLevel :: LogLevel
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}
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data LogLevel = Silent | Error | Warn | Debug deriving (Eq, Show, Ord)
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data Msg = Msg LogLevel String String
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evalFeatureData :: FeatureData a ResultTree p -> Either [Msg] a
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evalFeatureData FeatureData { fdTree = t, fdName = n, fdLevel = l } =
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either (Left . fmap (Msg l n)) Right $ evalActionTree t
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--------------------------------------------------------------------------------
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-- | Action Tree
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data ActionTree a t p =
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IOTree (Action a p) (t (IODependency a t p) p)
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| DBusTree (Action (Client -> a) p) (Maybe Client) (t (DBusDependency a t p) p)
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data Action a p = Standalone a | Consumer (p -> a) (p -> p -> Result p)
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evalActionTree :: ActionTree a ResultTree p -> Either [String] a
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evalActionTree at = case at of
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(IOTree a t) -> resolve a t
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(DBusTree a (Just c) t) -> (\f -> f c) <$> resolve a t
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-- TODO this is kinda redundant because I'll also get a message the dep tree
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-- failing what I don't have a client
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(DBusTree _ Nothing _) -> Left ["client not available to build action"]
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where
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resolve (Standalone f) t = const (Right f) =<< evalTreeNoop t
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resolve (Consumer f combine) t = maybe noPayload (Right . f)
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-- TODO not sure about this Right . Just thing, seems odd that I need it
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=<< evalTree combine (Right . Just) t
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noPayload = Left ["payload not available to build action"]
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--------------------------------------------------------------------------------
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-- | (Result) Tree
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data Tree d p = And (Tree d p) (Tree d p) | Or (Tree d p) (Tree d p) | Only d
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-- | how to interpret ResultTree combinations:
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-- First (Success a) (Tree a) -> Or that succeeded on left
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-- First (Fail a) (Tree a) -> And that failed on left
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-- Both (Fail a) (Fail a) -> Or that failed
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-- Both (Success a) (Success a) -> And that succeeded
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-- Both (Fail a) (Success a) -> Or that failed first and succeeded second
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-- Both (Success a) (Fail a) -> And that failed on the right
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data ResultTree d p =
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First (ResultTree d p) (Tree d p)
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| Both (ResultTree d p) (ResultTree d p)
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| Success d (Maybe p)
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| Fail d [String]
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-- | Given an updated condition tree, collect all evaluations and return a
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-- combined evaluation (which may be Nothing, Something, or an error). Must also
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-- supply a function to combine Results in the corner case where two And
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-- arguments are successful and have non-empty outputs.
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evalTree :: (p -> p -> Result p) -> (p -> Result p) -> ResultTree a p -> Result p
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evalTree f2 f1 = go (Right Nothing)
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where
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go acc (First a _) = case go acc a of
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-- Or succeeds on left
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(Right p) -> combine p =<< acc
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-- And fails on left
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(Left e) -> Left e
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go acc (Both a b) = case (go acc a, go acc b) of
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-- And succeeds
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(Right pa, Right pb) -> combine pb =<< combine pa =<< acc
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-- Or fails both
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(Left ea, Left eb) -> addErrors acc (ea ++ eb)
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-- And fails on right
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(Right _, Left eb) -> addErrors acc eb
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-- Or succeeds on right
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(Left ea, Right pb) -> either (Left . (ea ++)) (combine pb) acc
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go acc (Success _ p) = combine p =<< acc
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go acc (Fail _ e) = addErrors acc e
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addErrors cur new = Left $ new ++ fromLeft [] cur
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combine (Just a) (Just b) = f2 a b
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combine (Just a) Nothing = f1 a
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combine Nothing (Just b) = f1 b
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combine _ _ = Right Nothing
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evalTreeNoop :: ResultTree a p -> Result p
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evalTreeNoop = evalTree (const . evalNil) evalNil
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mapMTree :: Monad m => (d -> m (Result p)) -> Tree d p
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-> m (ResultTree d p)
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mapMTree f = fmap snd . go
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where
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go (And a b) = doTest a b True
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go (Or a b) = doTest a b False
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go (Only a) = either (\x -> (False, Fail a x)) (\x -> (True, Success a x))
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<$> f a
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doTest a b useAnd = do
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(success, ra) <- go a
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let try2nd = if useAnd then success else not success
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if try2nd then second (Both ra) <$> go b else return (success, First ra b)
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--------------------------------------------------------------------------------
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-- | Dependency
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data IODependency a t p = Executable Bool FilePath
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| AccessiblePath FilePath Bool Bool
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| IOTest String (IO (Maybe String))
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| IORead String (IO (Either String (Maybe p)))
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| Systemd UnitType String
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| NestedFeature (Feature a t p)
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data UnitType = SystemUnit | UserUnit deriving (Eq, Show)
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data DBusDependency a e p =
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Bus BusName
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| Endpoint BusName ObjectPath InterfaceName DBusMember
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| DBusIO (IODependency a e p)
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data DBusMember = Method_ MemberName
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| Signal_ MemberName
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| Property_ String
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deriving (Eq, Show)
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--------------------------------------------------------------------------------
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-- | Result
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type Result p = Either [String] (Maybe p)
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evalNil :: p -> Result q
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evalNil = const $ Right Nothing
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evalFail :: String -> Result p
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evalFail msg = Left [msg]
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-- | Given a condition tree, evaluate all dependencies according to 'fill in'
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-- the results (which may either be Nothing, a returned payload to use for the
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-- action, or an error.
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updateIOConditions :: Tree (IODependency a Tree p) p -> IO (ResultTree (IODependency a Tree p) p)
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updateIOConditions = mapMTree testIODependency
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updateDBusConditions :: Client -> Tree (DBusDependency a Tree p) p
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-> IO (ResultTree (DBusDependency a Tree p) p)
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updateDBusConditions client = mapMTree (evalDBusDependency client)
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--------------------------------------------------------------------------------
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-- | IO Dependency
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testIODependency :: IODependency a Tree p -> IO (Result p)
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testIODependency (Executable _ bin) = maybe err evalNil <$> findExecutable bin
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where
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err = Left ["executable '" ++ bin ++ "' not found"]
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testIODependency (IOTest _ t) = maybe (Right Nothing) (Left . (:[])) <$> t
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testIODependency (IORead _ t) = either (Left . (:[])) Right <$> t
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testIODependency (Systemd t n) = do
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(rc, _, _) <- readCreateProcessWithExitCode' (shell cmd) ""
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return $ case rc of
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ExitSuccess -> Right Nothing
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_ -> Left ["systemd " ++ unitType t ++ " unit '" ++ n ++ "' not found"]
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where
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cmd = fmtCmd "systemctl" $ ["--user" | t == UserUnit] ++ ["status", n]
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unitType SystemUnit = "system"
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unitType UserUnit = "user"
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testIODependency (AccessiblePath p r w) = do
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res <- getPermissionsSafe p
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let msg = permMsg res
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return msg
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where
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testPerm False _ _ = Nothing
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testPerm True f res = Just $ f res
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permMsg NotFoundError = evalFail "file not found"
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permMsg PermError = evalFail "could not get permissions"
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permMsg (PermResult res) =
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case (testPerm r readable res, testPerm w writable res) of
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(Just False, Just False) -> evalFail "file not readable or writable"
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(Just False, _) -> evalFail "file not readable"
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(_, Just False) -> evalFail "file not writable"
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_ -> Right Nothing
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testIODependency (NestedFeature ftr) = go ftr
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where
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go (Feature (FeatureData { fdTree = t }) alt) =
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-- TODO add feature name to messages
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case t of
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(IOTree a ct) -> evalFun a <$> updateIOConditions ct
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(DBusTree a (Just client) ct) -> evalFun a <$> updateDBusConditions client ct
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(DBusTree _ Nothing _) -> failMaybe alt ["client not found"]
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where
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failMaybe NoFeature msg = return $ Left msg
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failMaybe f _ = go f
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evalFun (Standalone _) = evalTreeNoop
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evalFun (Consumer _ f) = evalTree f (return . return)
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go _ = return $ Right Nothing
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--------------------------------------------------------------------------------
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-- | DBus Dependency Result
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introspectInterface :: InterfaceName
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introspectInterface = interfaceName_ "org.freedesktop.DBus.Introspectable"
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introspectMethod :: MemberName
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introspectMethod = memberName_ "Introspect"
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evalDBusDependency :: Client -> DBusDependency a Tree p -> IO (Result p)
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evalDBusDependency client (Bus bus) = do
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ret <- callMethod client queryBus queryPath queryIface queryMem
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return $ case ret of
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Left e -> evalFail e
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Right b -> let ns = bodyGetNames b in
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if bus' `elem` ns then Right Nothing
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else evalFail $ unwords ["name", singleQuote bus', "not found on dbus"]
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where
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bus' = formatBusName bus
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queryBus = busName_ "org.freedesktop.DBus"
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queryIface = interfaceName_ "org.freedesktop.DBus"
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queryPath = objectPath_ "/"
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queryMem = memberName_ "ListNames"
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bodyGetNames [v] = fromMaybe [] $ fromVariant v :: [String]
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bodyGetNames _ = []
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evalDBusDependency client (Endpoint busname objpath iface mem) = do
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ret <- callMethod client busname objpath introspectInterface introspectMethod
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return $ case ret of
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Left e -> evalFail e
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Right body -> procBody body
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where
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procBody body = let res = findMem =<< I.parseXML objpath =<< fromVariant
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=<< listToMaybe body in
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case res of
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Just True -> Right Nothing
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_ -> evalFail $ fmtMsg' mem
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findMem = fmap (matchMem mem)
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. find (\i -> I.interfaceName i == iface)
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. I.objectInterfaces
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matchMem (Method_ n) = elemMember n I.methodName I.interfaceMethods
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matchMem (Signal_ n) = elemMember n I.signalName I.interfaceSignals
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matchMem (Property_ n) = elemMember n I.propertyName I.interfaceProperties
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elemMember n fname fmember = elem n . fmap fname . fmember
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fmtMem (Method_ n) = "method " ++ singleQuote (formatMemberName n)
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fmtMem (Signal_ n) = "signal " ++ singleQuote (formatMemberName n)
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fmtMem (Property_ n) = "property " ++ singleQuote n
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fmtMsg' m = unwords
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[ "could not find"
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, fmtMem m
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, "on interface"
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, singleQuote $ formatInterfaceName iface
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, "on bus"
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, formatBusName busname
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]
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evalDBusDependency _ (DBusIO d) = testIODependency d
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