Completely replace App.server by App.get, a function applying a projector to the server

src/App.hs

@@ -4,7 +4,7 @@ module App (
     , Context(..)
     , debug
     , exec
-    , server
+    , get
     , session
     , update
   ) where
@@ -22,12 +22,9 @@ data Context = Context {
 
 type T a = ReaderT Context IO a
 
-server :: T Server.T
-server = asks mServer >>= lift . readMVar
-
 get :: (Server.T -> a) -> T a
 get projector =
-  projector <$> server
+  lift . fmap projector . readMVar =<< asks mServer
 
 session :: T Session.T
 session = do

src/Automaton.hs

@@ -3,7 +3,7 @@ module Automaton (
     loop
   ) where
 
-import qualified App (Context(..), T, exec, server, session, update)
+import qualified App (Context(..), T, exec, get, session, update)
 import Control.Monad.Reader (asks)
 import qualified Game (new, play)
 import qualified Hanafuda.Message as Message (FromClient(..), T(..))
@@ -19,7 +19,7 @@ receive :: Message.FromClient -> Session.Status -> App.T ()
 receive (Message.Hello {Message.name}) Nothing = do
   sessionID <- asks App.sessionID
   playerID <- App.exec (Server.register sessionID)
-  room <- Server.room <$> App.server
+  room <- App.get Server.room
   App.update (Server.update sessionID $ Session.setPlayer playerID name)
   Messaging.send $ Message.Welcome room playerID
 
@@ -32,7 +32,7 @@ receive (Message.Hello {Message.name}) (Just player) = do
 receive (Message.Tadaima {Message.myID, Message.name}) Nothing = do
   sessionID <- asks App.sessionID
   App.update $ Server.logIn name myID sessionID
-  Message.Okaeri . Server.room <$> App.server >>= Messaging.send
+  Message.Okaeri <$> App.get Server.room >>= Messaging.send
 
 receive (Message.Tadaima {}) (Just _) = sendError "You're already logged in"
 

src/Game.hs

@@ -5,7 +5,7 @@ module Game (
     , play
   ) where
 
-import qualified App (T, server)
+import qualified App (T, get)
 import Control.Monad.Except (runExceptT)
 import Control.Monad.Reader (lift)
 import Control.Monad.Writer (runWriterT)
@@ -78,7 +78,7 @@ publicState game = PublicState {
 
 exportGame :: PlayerID -> Game -> App.T PublicGame
 exportGame playerID game = do
-  Keys.T {encrypt, sign} <- Server.keys <$> App.server
+  Keys.T {encrypt, sign} <- App.get Server.keys
   n <- lift newNonce
   return $ PublicGame {
         nonce = Saltine.encode n
@@ -114,7 +114,7 @@ gameOf public private = KoiKoi.Game {
 
 importGame :: PublicGame -> App.T (Either String Game)
 importGame PublicGame {nonce, private, public, publicSignature} = do
-  Keys.T {encrypt, sign} <- Server.keys <$> App.server
+  Keys.T {encrypt, sign} <- App.get Server.keys
   if signVerifyDetached (Keys.public sign) publicSignature $ toJSON public
   then return $ do
     n <- Saltine.decode nonce `orDie` "Could not decode nonce"

src/Messaging.hs

@@ -12,7 +12,7 @@ module Messaging (
     , sendTo
   ) where
 
-import qualified App (T, debug, server, session)
+import qualified App (T, debug, get, session)
 import Control.Monad.Reader (lift)
 import Data.Aeson (eitherDecode', encode)
 import Data.ByteString.Lazy.Char8 (unpack)
@@ -40,7 +40,7 @@ sendToSessions sessions obj = do
 
 sendTo :: [KoiKoi.PlayerID] -> Message.T -> App.T ()
 sendTo playerIDs obj = do
-  sessions <- Server.sessionsWhere selectedPlayer <$> App.server
+  sessions <- App.get $ Server.sessionsWhere selectedPlayer
   sendToSessions (elems sessions) obj
   where
     selectedPlayer playerID _ = Set.member playerID $ Set.fromList playerIDs
@@ -51,8 +51,8 @@ send obj = do
   sendToSessions [currentSession] obj
 
 broadcast :: Message.T -> App.T ()
-broadcast obj =
-  (elems . Server.sessions) <$> App.server >>= flip sendToSessions obj
+broadcast obj = do
+  App.get (elems . Server.sessions) >>= flip sendToSessions obj
 
 relay :: FromClient -> (Message.T -> App.T ()) -> App.T ()
 relay message f = do