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DEL old dependency crap code

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Nathan Dwarshuis 2022-06-30 18:31:56 -04:00
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lib/XMonad/Internal/Dependency_.hs
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{-# LANGUAGE DeriveFunctor #-}
{-# LANGUAGE GADTs #-}
{-# LANGUAGE OverloadedStrings #-}
--------------------------------------------------------------------------------
-- | Functions for handling dependencies
module XMonad.Internal.Dependency
( MaybeAction
, AnyFeature(..)
, DepChoice(..)
, MaybeX
, FullDep(..)
, DepTree(..)
, Action(..)
, DBusDep(..)
, FeatureX
, FeatureIO
, Feature(..)
, Feature_(..)
, Warning(..)
, Dependency(..)
, UnitType(..)
, DBusMember(..)
, feature
, ioFeature
, evalFeature
, systemUnit
, userUnit
, pathR
, pathW
, pathRW
, featureDefault
, featureExeArgs
, featureExe
, featureEndpoint
, whenSatisfied
, ifSatisfied
, executeFeature
, executeFeature_
, executeFeatureWith
, executeFeatureWith_
, depName
, fullDep
, exe
, listToAnds
) where
import Control.Monad.IO.Class
import Control.Monad.Identity
-- import Data.Aeson
import Data.Bifunctor
import Data.Either
import Data.List (find)
import Data.Maybe
-- import qualified Data.Text as T
import DBus
import DBus.Client
import DBus.Internal
import qualified DBus.Introspection as I
import System.Directory (findExecutable, readable, writable)
import System.Environment
import System.Exit
import XMonad.Core (X, io)
import XMonad.Internal.IO
import XMonad.Internal.Process
import XMonad.Internal.Shell
--------------------------------------------------------------------------------
-- | Features
--
-- A 'feature' is composed of a 'dependency tree' which at the root has an
-- 'action' to be performed with a number of 'dependencies' below it.
--
-- NOTE: there is no way to make a feature depend on another feature. This is
-- very complicated to implement and would only be applicable to a few instances
-- (notably the dbus interfaces). In order to implement a dependency tree, use
-- dependencies that target the output/state of another feature; this is more
-- robust anyways, at the cost of being a bit slower.
-- TODO some things to add to make this more feature-ful (lol)
-- - use AndOr types to encode alternative dependencies into the tree
-- - use an Alt data constructor for Features (which will mean "try A before B"
-- - add an Either String Bool to dependency nodes that encodes testing status
-- (where Right False means untested)
-- - add a lens/functor mapper thingy to walk down the tree and update testing
-- status fields
-- - print to JSON
-- - make sum type to hold all type instances of Feature blabla (eg IO and X)
-- - figure out how to make features a dependency of another feature
data Feature_ a = Feature_
{ ftrDepTree :: DepTree a
, ftrName :: String
, ftrWarning :: Warning
}
data Feature a = Feature (Feature_ a) (Feature a)
| NoFeature
| ConstFeature a
-- TODO this is silly as is, and could be made more useful by representing
-- loglevels
data Warning = Silent | Default
type FeatureX = Feature (X ())
type FeatureIO = Feature (IO ())
data AnyFeature = FX FeatureX | FIO FeatureIO
feature :: String -> Warning -> DepTree a -> Feature a
feature n w t = Feature f NoFeature
where
f = Feature_
{ ftrDepTree = t
, ftrName = n
, ftrWarning = w
}
ioFeature :: MonadIO m => Feature (IO b) -> Feature (m b)
ioFeature (ConstFeature a) = ConstFeature $ liftIO a
ioFeature NoFeature = NoFeature
ioFeature (Feature f r)
= Feature (f {ftrDepTree = liftIO <$> ftrDepTree f}) $ ioFeature r
featureDefault :: String -> DepChoice (FullDep Dependency) -> a -> Feature a
featureDefault n ds x = feature n Default $ GenTree (Single x) ds
featureExe :: MonadIO m => String -> String -> Feature (m ())
featureExe n cmd = featureExeArgs n cmd []
featureExeArgs :: MonadIO m => String -> String -> [String] -> Feature (m ())
featureExeArgs n cmd args =
featureDefault n (Only $ FullDep (Right False) $ Executable cmd) $ spawnCmd cmd args
featureEndpoint :: String -> BusName -> ObjectPath -> InterfaceName
-> MemberName -> Maybe Client -> FeatureIO
featureEndpoint name busname path iface mem client = feature name Default
$ DBusTree (Single cmd) client deps
where
cmd c = void $ callMethod c busname path iface mem
deps = Only $ FullDep (Right False) $ Endpoint busname path iface $ Method_ mem
--------------------------------------------------------------------------------
-- | Dependency Trees
--
-- Dependency trees have two subtypes: general and DBus. The latter require a
-- DBus client to evaluate (and will automatically fail if this is missing).
-- The former can be evaluated independently.
data DepChoice a = And (DepChoice a) (DepChoice a)
| Or (DepChoice a) (DepChoice a)
| Only a
data DepChoice_ a b = And_ (b -> b -> b) (DepChoice_ a b) (DepChoice_ a b)
| Or_ (DepChoice_ a b) (DepChoice_ a b)
| Only_ a
listToAnds :: a -> [a] -> DepChoice a
listToAnds i = foldr (And . Only) (Only i)
-- listToAnds' :: [a] -> Maybe (DepChoice a)
-- listToAnds' [] = Nothing
-- listToAnds' (x:xs) = Just $ foldr (And . Only) (Only x) xs
data DepTree a = GenTree (Action a) (DepChoice (FullDep Dependency))
| DBusTree (Action (Client -> a)) (Maybe Client) (DepChoice (FullDep DBusDep))
data DepTree_ a b = GenTree_ (Action_ a b) (DepChoice_ (FullDep Dependency) b)
| DBusTree_ (Action_ (Client -> a) b) (Maybe Client) (DepChoice_ (FullDep DBusDep) b)
instance Functor DepTree where
fmap f (GenTree a ds) = GenTree (f <$> a) ds
fmap f (DBusTree a c ds) = DBusTree (fmap (fmap f) a) c ds
--------------------------------------------------------------------------------
-- | Actions
--
-- Actions have two subtypes: single and double. Single actions are just one
-- independent action. Double actions have one dependent pre-step which the
-- main action consumes (and fails if the pre-step fails).
data Action a = Single a | forall b. Double (b -> a) (IO (Either [String] b))
data Action_ a b = Standalone a | Consumer (b -> a)
instance Functor Action where
fmap f (Single a) = Single (f a)
fmap f (Double a b) = Double (f . a) b
--------------------------------------------------------------------------------
-- | Feature evaluation
--
-- Evaluate a feature by testing if its dependencies are satisfied, and return
-- either the action of the feature or 0 or more error messages that signify
-- what dependencies are missing and why.
type MaybeAction a = Maybe a
type MaybeX = MaybeAction (X ())
evalFeature :: Feature a -> IO (MaybeAction a)
evalFeature (ConstFeature x) = return $ Just x
evalFeature NoFeature = return Nothing
evalFeature (Feature f alt) = do
procName <- getProgName
res <- evalTree =<< evalTree' a
case res of
Right r -> return $ Just r
Left l -> do
printWarnings procName l
case alt of
NoFeature -> return Nothing
-- TODO make this message better
next -> putStrLn "trying alternative" >> evalFeature next
where
Feature_ {ftrDepTree = a, ftrName = n, ftrWarning = w} = f
printWarnings procName es = do
case w of
Silent -> return ()
Default -> let prefix = n ++ " disabled; "
es' = fmap (fmtMsg procName . (prefix ++)) es in
mapM_ putStrLn es'
fmtMsg procName msg = unwords [bracket procName, bracket "WARNING", msg]
bracket s = concat ["[", s, "]"]
mapMDepChoice :: Monad m => (a -> m a) -> (a -> Bool) -> DepChoice a -> m (DepChoice a)
mapMDepChoice f pass = fmap snd . go
where
go d@(And a b) = do
(ra, a') <- go a
if not ra then return (False, d) else do
(rb, b') <- go b
return $ if rb then (True, And a' b') else (False, d)
go d@(Or a b) = do
(ra, a') <- go a
if ra then return (True, Or a' b) else do
(rb, b') <- go b
return $ if rb then (True, Or a' b') else (False, d)
go d@(Only a) = do
a' <- f a
return $ if pass a' then (True, Only a') else (False, d)
-- foldDepChoice :: (a -> Bool) -> DepChoice a -> Bool
-- foldDepChoice get dc = case dc of
-- And a b -> go a && go b
-- Or a b -> go a || go b
-- Only a -> get a
-- where
-- go = foldDepChoice get
foldDepChoice' :: Bool -> (a -> Maybe b) -> DepChoice a -> [b]
foldDepChoice' justSucceed get = fromMaybe [] . go []
where
go acc (And a b) = Just $ andFun acc a b
go acc (Or a b) = Just $ orFun acc a b
go acc (Only a) = (:acc) <$> get a
(andFun, orFun) = if justSucceed then (and', or') else (or', and')
and' acc a b = case (go acc a, go acc b) of
(Just a', Just b') -> a' ++ b' ++ acc
(Just a', Nothing) -> a' ++ acc
(Nothing, _) -> acc
or' acc a b = fromMaybe [] (go acc a) ++ fromMaybe [] (go acc b) ++ acc
foldDepChoiceX :: (a -> Either b c) -> DepChoice_ a c -> Either [b] c
foldDepChoiceX get = go (Left [])
where
go acc (And_ f a b) = case (go acc a, go acc b) of
(Right a', Right b') -> Right $ f a' b'
(Left a', Right _) -> toLeft acc a'
(Right _, Left b') -> toLeft acc b'
(Left a', Left b') -> toLeft acc $ a' ++ b'
go acc (Or_ a b) = case (go acc a, go acc b) of
(Right a', _) -> Right a'
(Left _, Right b') -> Right b'
(Left a', Left b') -> toLeft acc $ a' ++ b'
go acc (Only_ a) = first (:fromLeft [] acc) $ get a
toLeft acc xs = Left $ xs ++ fromLeft [] acc
-- foldDepChoice :: DepChoice a -> (a -> Maybe b) -> [b]
-- foldDepChoice dc f = go [] dc
-- where
-- go acc d = case d of
-- And a b -> do
-- acc'@(a':_) <- go acc a
-- if pass a' then go acc' b else return acc
-- Or a b -> do
-- acc'@(a':_) <- go acc a
-- if pass a' then return [a'] else go acc' b
-- Only a -> maybe acc $ f a
-- TODO wet code
evalTree :: DepTree a -> IO (Either [String] a)
evalTree dt = case dt of
(GenTree a ds) ->
case foldDep ds of
[] -> evalAction a
es -> return $ Left es
(DBusTree a (Just client) ds) ->
case foldDep ds of
[] -> fmap (\f -> f client) <$> evalAction a
es -> return $ Left es
(DBusTree _ Nothing _) -> return $ Left ["client not available"]
where
foldDep = foldDepChoice' False fullDepMsg
fullDepMsg (FullDep e _) = either Just (const Nothing) e
evalTreeX :: DepTree_ a b -> IO (Either [String] a)
evalTreeX dt = case dt of
(GenTree_ a ds) ->
case foldDep ds of
[] -> evalAction a
es -> return $ Left es
(DBusTree_ a (Just client) ds) ->
case foldDep ds of
[] -> fmap (\f -> f client) <$> evalAction a
es -> return $ Left es
(DBusTree_ _ Nothing _) -> return $ Left ["client not available"]
where
foldDep = foldDepChoiceX fullDepMsg
fullDepMsg (FullDep e _) = either Just (const Nothing) e
depResult :: FullDep Dependency -> Either String (Maybe b)
depResult (FullDep l@(Left e) d) = Left e
depResult (FullDep _ d) = Right $ extractDependency d
evalTree' :: DepTree a -> IO (DepTree a)
evalTree' (GenTree a ds) = GenTree a <$> mapMDepChoice eval pass ds
where
eval (FullDep _ d) = do
r <- evalDependency d
return $ FullDep (maybe (Right True) Left r) d
pass (FullDep (Right True) _) = True
pass _ = True
evalTree' d@(DBusTree _ Nothing _) = return d
evalTree' (DBusTree a (Just client) ds) = DBusTree a (Just client) <$> mapMDepChoice eval pass ds
where
eval (FullDep _ d) = do
r <- eval' d
return $ FullDep (maybe (Right True) Left r) d
eval' (DBusGenDep d) = evalDependency d
eval' x = dbusDepSatisfied client x
pass (FullDep (Right True) _) = True
pass _ = True
evalAction :: Action a -> IO (Either [String] a)
evalAction (Single a) = return $ Right a
evalAction (Double a b) = fmap a <$> b
-- evalActionX :: Action_ a b -> IO (Either [String] a)
-- evalActionX (Standalone a) = return $ Right a
-- evalActionX (Consumer f) = fmap a <$> b
executeFeatureWith :: MonadIO m => (m a -> m a) -> a -> Feature (IO a) -> m a
executeFeatureWith iof def ftr = do
a <- io $ evalFeature ftr
maybe (return def) (iof . io) a
executeFeatureWith_ :: MonadIO m => (m () -> m ()) -> Feature (IO ()) -> m ()
executeFeatureWith_ iof = executeFeatureWith iof ()
executeFeature :: MonadIO m => a -> Feature (IO a) -> m a
executeFeature = executeFeatureWith id
executeFeature_ :: Feature (IO ()) -> IO ()
executeFeature_ = executeFeature ()
whenSatisfied :: Monad m => MaybeAction (m ()) -> m ()
whenSatisfied = flip ifSatisfied skip
ifSatisfied :: MaybeAction a -> a -> a
ifSatisfied (Just x) _ = x
ifSatisfied _ alt = alt
--------------------------------------------------------------------------------
-- | Dependencies (General)
data FullDep a = FullDep (Either String Bool) a deriving (Functor)
fullDep :: a -> FullDep a
fullDep = FullDep (Right True)
data Dependency = Executable String
| AccessiblePath FilePath Bool Bool
| IOTest String (IO (Maybe String))
| Systemd UnitType String
| DepFeature AnyFeature
data UnitType = SystemUnit | UserUnit deriving (Eq, Show)
exe :: String -> FullDep Dependency
exe = fullDep . Executable
pathR :: String -> FullDep Dependency
pathR n = fullDep $ AccessiblePath n True False
pathW :: String -> FullDep Dependency
pathW n = fullDep $ AccessiblePath n False True
pathRW :: String -> FullDep Dependency
pathRW n = fullDep $ AccessiblePath n True True
systemUnit :: String -> FullDep Dependency
systemUnit = fullDep . Systemd SystemUnit
userUnit :: String -> FullDep Dependency
userUnit = fullDep . Systemd UserUnit
--------------------------------------------------------------------------------
-- | Dependencies (DBus)
data DBusMember = Method_ MemberName
| Signal_ MemberName
| Property_ String
deriving (Eq, Show)
data DBusDep =
Bus BusName
| Endpoint BusName ObjectPath InterfaceName DBusMember
| DBusGenDep Dependency
--------------------------------------------------------------------------------
-- | Dependency evaluation (General)
--
-- Test the existence of dependencies and return either Nothing (which actually
-- means success) or Just <error message>.
evalDependency :: Dependency -> IO (Maybe String)
evalDependency (Executable n) = exeSatisfied n
evalDependency (IOTest _ t) = t
evalDependency (Systemd t n) = unitSatisfied t n
evalDependency (AccessiblePath p r w) = pathSatisfied p r w
evalDependency (DepFeature _) = undefined
-- TODO add something here to eval a nested feature's dependencies while
-- bypassing the feature itself
extractDependency :: Dependency -> Maybe a
extractDependency (Executable n) = Nothing
extractDependency (IOTest _ t) = Nothing
extractDependency (Systemd t n) = Nothing
extractDependency (AccessiblePath p r w) = Nothing
extractDependency (DepFeature _) = Nothing
exeSatisfied :: String -> IO (Maybe String)
exeSatisfied x = do
r <- findExecutable x
return $ case r of
(Just _) -> Nothing
_ -> Just $ "executable '" ++ x ++ "' not found"
unitSatisfied :: UnitType -> String -> IO (Maybe String)
unitSatisfied u x = do
(rc, _, _) <- readCreateProcessWithExitCode' (shell cmd) ""
return $ case rc of
ExitSuccess -> Nothing
_ -> Just $ "systemd " ++ unitType u ++ " unit '" ++ x ++ "' not found"
where
cmd = fmtCmd "systemctl" $ ["--user" | u == UserUnit] ++ ["status", x]
unitType SystemUnit = "system"
unitType UserUnit = "user"
pathSatisfied :: FilePath -> Bool -> Bool -> IO (Maybe String)
pathSatisfied p testread testwrite = do
res <- getPermissionsSafe p
let msg = permMsg res
return msg
where
testPerm False _ _ = Nothing
testPerm True f r = Just $ f r
permMsg NotFoundError = Just "file not found"
permMsg PermError = Just "could not get permissions"
permMsg (PermResult r) =
case (testPerm testread readable r, testPerm testwrite writable r) of
(Just False, Just False) -> Just "file not readable or writable"
(Just False, _) -> Just "file not readable"
(_, Just False) -> Just "file not writable"
_ -> Nothing
--------------------------------------------------------------------------------
-- | Dependency evaluation (DBus)
introspectInterface :: InterfaceName
introspectInterface = interfaceName_ "org.freedesktop.DBus.Introspectable"
introspectMethod :: MemberName
introspectMethod = memberName_ "Introspect"
dbusDepSatisfied :: Client -> DBusDep -> IO (Maybe String)
dbusDepSatisfied client (Bus bus) = do
ret <- callMethod client queryBus queryPath queryIface queryMem
return $ case ret of
Left e -> Just e
Right b -> let ns = bodyGetNames b in
if bus' `elem` ns then Nothing
else Just $ unwords ["name", singleQuote bus', "not found on dbus"]
where
bus' = formatBusName bus
queryBus = busName_ "org.freedesktop.DBus"
queryIface = interfaceName_ "org.freedesktop.DBus"
queryPath = objectPath_ "/"
queryMem = memberName_ "ListNames"
bodyGetNames [v] = fromMaybe [] $ fromVariant v :: [String]
bodyGetNames _ = []
dbusDepSatisfied client (Endpoint busname objpath iface mem) = do
ret <- callMethod client busname objpath introspectInterface introspectMethod
return $ case ret of
Left e -> Just e
Right body -> procBody body
where
procBody body = let res = findMem =<< I.parseXML objpath =<< fromVariant
=<< listToMaybe body in
case res of
Just True -> Nothing
_ -> Just $ fmtMsg' mem
findMem = fmap (matchMem mem)
. find (\i -> I.interfaceName i == iface)
. I.objectInterfaces
matchMem (Method_ n) = elemMember n I.methodName I.interfaceMethods
matchMem (Signal_ n) = elemMember n I.signalName I.interfaceSignals
matchMem (Property_ n) = elemMember n I.propertyName I.interfaceProperties
elemMember n fname fmember = elem n . fmap fname . fmember
fmtMem (Method_ n) = "method " ++ singleQuote (formatMemberName n)
fmtMem (Signal_ n) = "signal " ++ singleQuote (formatMemberName n)
fmtMem (Property_ n) = "property " ++ singleQuote n
fmtMsg' m = unwords
[ "could not find"
, fmtMem m
, "on interface"
, singleQuote $ formatInterfaceName iface
, "on bus"
, formatBusName busname
]
dbusDepSatisfied _ (DBusGenDep d) = evalDependency d
--------------------------------------------------------------------------------
-- | Printing dependencies
-- instance ToJSON (Feature_ a) where
-- toJSON Feature_ {} = undefined
-- instance ToJSON (Feature_ a) where
-- toJSON Feature_ {} = undefined
-- instance ToJSON (DepTree a) where
-- toJSON (GenTree _ _) = undefined
-- toJSON (DBusTree {}) = undefined
-- instance ToJSON Dependency where
-- toJSON (Executable n) = depValue "executable" Nothing n
-- toJSON (IOTest d _) = depValue "internal" Nothing d
-- toJSON (Systemd t n) = depValue "systemd" (Just $ tp t) n
-- where
-- tp SystemUnit = "sys"
-- tp UserUnit = "user"
-- toJSON (AccessiblePath p r w) = depValue "path" perms p
-- where
-- perms = case (r, w) of
-- (True, True) -> Just "readwrite"
-- (True, False) -> Just "read"
-- (False, True) -> Just "write"
-- _ -> Nothing
-- toJSON (DepFeature _) = undefined
-- depValue :: String -> Maybe String -> String -> Value
-- depValue t s n = object
-- [ "type" .= t
-- , "name" .= n
-- , "subtype" .= maybe Null (String . T.pack) s
-- ]
depName :: Dependency -> String
depName (Executable n) = "executable: " ++ n
depName (IOTest d _) = "internal: " ++ d
depName (Systemd t n) = "systemd (" ++ tp t ++ "): " ++ n
where
tp SystemUnit = "sys"
tp UserUnit = "user"
depName (AccessiblePath p _ _) = "path: " ++ p
depName (DepFeature _) = "feature: blablabla"