{-# LANGUAGE PackageImports #-} {-# LANGUAGE GeneralizedNewtypeDeriving #-} module Propellor.Types ( Host(..) , Info(..) , getInfo , Propellor(..) , Property(..) , RevertableProperty(..) , IsProp , describe , toProp , requires , Desc , Result(..) , ActionResult(..) , CmdLine(..) , PrivDataField(..) , PrivData , Context(..) , anyContext , SshKeyType(..) , Val(..) , fromVal , module Propellor.Types.OS , module Propellor.Types.Dns ) where import Data.Monoid import Control.Applicative import System.Console.ANSI import System.Posix.Types import "mtl" Control.Monad.Reader import "MonadCatchIO-transformers" Control.Monad.CatchIO import qualified Data.Set as S import qualified Propellor.Types.Dns as Dns import Propellor.Types.OS import Propellor.Types.Chroot import Propellor.Types.Dns import Propellor.Types.Docker import Propellor.Types.PrivData -- | Everything Propellor knows about a system: Its hostname, -- properties and other info. data Host = Host { hostName :: HostName , hostProperties :: [Property] , hostInfo :: Info } deriving (Show) -- | Propellor's monad provides read-only access to info about the host -- it's running on. newtype Propellor p = Propellor { runWithHost :: ReaderT Host IO p } deriving ( Monad , Functor , Applicative , MonadReader Host , MonadIO , MonadCatchIO ) -- | The core data type of Propellor, this represents a property -- that the system should have, and an action to ensure it has the -- property. data Property = Property { propertyDesc :: Desc , propertySatisfy :: Propellor Result -- ^ must be idempotent; may run repeatedly , propertyInfo :: Info -- ^ a property can add info to the host. } instance Show Property where show p = "property " ++ show (propertyDesc p) -- | A property that can be reverted. data RevertableProperty = RevertableProperty Property Property class IsProp p where -- | Sets description. describe :: p -> Desc -> p toProp :: p -> Property -- | Indicates that the first property can only be satisfied -- once the second one is. requires :: p -> Property -> p getInfo :: p -> Info instance IsProp Property where describe p d = p { propertyDesc = d } toProp p = p getInfo = propertyInfo x `requires` y = Property (propertyDesc x) satisfy info where info = getInfo y <> getInfo x satisfy = do r <- propertySatisfy y case r of FailedChange -> return FailedChange _ -> propertySatisfy x instance IsProp RevertableProperty where -- | Sets the description of both sides. describe (RevertableProperty p1 p2) d = RevertableProperty (describe p1 d) (describe p2 ("not " ++ d)) toProp (RevertableProperty p1 _) = p1 (RevertableProperty p1 p2) `requires` y = RevertableProperty (p1 `requires` y) p2 -- | Return the Info of the currently active side. getInfo (RevertableProperty p1 _p2) = getInfo p1 type Desc = String data Result = NoChange | MadeChange | FailedChange deriving (Read, Show, Eq) instance Monoid Result where mempty = NoChange mappend FailedChange _ = FailedChange mappend _ FailedChange = FailedChange mappend MadeChange _ = MadeChange mappend _ MadeChange = MadeChange mappend NoChange NoChange = NoChange -- | Results of actions, with color. class ActionResult a where getActionResult :: a -> (String, ColorIntensity, Color) instance ActionResult Bool where getActionResult False = ("failed", Vivid, Red) getActionResult True = ("done", Dull, Green) instance ActionResult Result where getActionResult NoChange = ("ok", Dull, Green) getActionResult MadeChange = ("done", Vivid, Green) getActionResult FailedChange = ("failed", Vivid, Red) data CmdLine = Run HostName | Spin HostName | SimpleRun HostName | Set PrivDataField Context | Dump PrivDataField Context | Edit PrivDataField Context | ListFields | AddKey String | Continue CmdLine | Update HostName | DockerInit HostName | DockerChain HostName String | ChrootChain HostName FilePath Bool Bool | GitPush Fd Fd deriving (Read, Show, Eq) -- | Information about a host. data Info = Info { _os :: Val System , _privDataFields :: S.Set (PrivDataField, Context) , _sshPubKey :: Val String , _aliases :: S.Set HostName , _dns :: S.Set Dns.Record , _namedconf :: Dns.NamedConfMap , _dockerinfo :: DockerInfo Host , _chrootinfo :: ChrootInfo Host } deriving (Show) instance Monoid Info where mempty = Info mempty mempty mempty mempty mempty mempty mempty mempty mappend old new = Info { _os = _os old <> _os new , _privDataFields = _privDataFields old <> _privDataFields new , _sshPubKey = _sshPubKey old <> _sshPubKey new , _aliases = _aliases old <> _aliases new , _dns = _dns old <> _dns new , _namedconf = _namedconf old <> _namedconf new , _dockerinfo = _dockerinfo old <> _dockerinfo new , _chrootinfo = _chrootinfo old <> _chrootinfo new } data Val a = Val a | NoVal deriving (Eq, Show) instance Monoid (Val a) where mempty = NoVal mappend old new = case new of NoVal -> old _ -> new fromVal :: Val a -> Maybe a fromVal (Val a) = Just a fromVal NoVal = Nothing