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|
{-# LANGUAGE OverloadedStrings #-}
module Cafp.Main.Server
( main
) where
import Cafp.Game
import Cafp.Messages
import Control.Concurrent.MVar (MVar)
import qualified Control.Concurrent.MVar as MVar
import Control.Concurrent.STM (STM, TVar, atomically)
import qualified Control.Concurrent.STM as STM
import Control.Exception (bracket)
import Control.Lens ((^.))
import Control.Monad (forever, when)
import qualified Data.Aeson as Aeson
import qualified Data.ByteString as B
import qualified Data.ByteString.Lazy as BL
import Data.Foldable (for_)
import qualified Data.HashMap.Strict as HMS
import qualified Data.List as L
import Data.Maybe (fromMaybe)
import Data.String (fromString)
import qualified Data.Text as T
import qualified Data.Text.Encoding as T
import qualified Data.Text.IO as T
import qualified Data.Vector as V
import qualified Network.Wai as Wai
import qualified Network.Wai.Handler.Warp as Warp
import qualified Network.Wai.Handler.WebSockets as WaiWs
import qualified Network.WebSockets as WS
import System.Environment (getEnv)
import qualified System.IO as IO
import System.Random (StdGen, newStdGen)
import qualified Web.Scotty as Scotty
warning :: String -> IO ()
warning = IO.hPutStrLn IO.stderr
type RoomId = T.Text
type Sink = BL.ByteString -> IO ()
data Room = Room
{ roomGame :: TVar Game
, roomSinks :: TVar (HMS.HashMap PlayerId Sink)
}
data Server = Server
{ serverCards :: Cards
, serverRooms :: MVar (HMS.HashMap RoomId Room)
}
readCards :: IO Cards
readCards = Cards
<$> fmap parseCards (T.readFile "assets/black.txt")
<*> fmap parseCards (T.readFile "assets/white.txt")
where
parseCards = V.fromList . filter (not . T.null) . map dropComment . T.lines
dropComment = T.strip . fst . T.break (== '#')
newServer :: IO Server
newServer = Server <$> readCards <*> MVar.newMVar HMS.empty
newRoom :: Server -> StdGen -> STM Room
newRoom server gen = Room
<$> (STM.newTVar $ newGame (serverCards server) gen)
<*> STM.newTVar HMS.empty
scottyApp :: IO Wai.Application
scottyApp = Scotty.scottyApp $ do
Scotty.get "/rooms/:id/" $ do
roomId <- Scotty.param "id"
when (T.length roomId < 6) $
Scotty.raise "Room ID should be at least 6 characters"
Scotty.setHeader "Content-Type" "text/html"
Scotty.file "assets/client.html"
Scotty.get "/assets/client.js" $ do
Scotty.setHeader "Content-Type" "application/JavaScript"
Scotty.file "assets/client.js"
Scotty.get "/assets/style.css" $ do
Scotty.setHeader "Content-Type" "text/css"
Scotty.file "assets/style.css"
routePendingConnection :: WS.PendingConnection -> Maybe RoomId
routePendingConnection pending =
let path = T.decodeUtf8 . WS.requestPath $ WS.pendingRequest pending in
case splitPath path of
["rooms", roomId, "events"] -> Just roomId
_ -> Nothing
getOrCreateRoom :: Server -> RoomId -> IO Room
getOrCreateRoom server roomId = MVar.modifyMVar (serverRooms server) $ \rooms ->
case HMS.lookup roomId rooms of
Just room -> pure (rooms, room)
Nothing -> do
gen <- newStdGen
room <- atomically $ newRoom server gen
pure (HMS.insert roomId room rooms, room)
joinRoom :: Room -> Sink -> STM PlayerId
joinRoom room sink = do
pid <- STM.stateTVar (roomGame room) joinGame
STM.modifyTVar' (roomSinks room) $ HMS.insert pid sink
pure pid
leaveRoom :: Room -> PlayerId -> STM ()
leaveRoom room pid = do
STM.modifyTVar' (roomGame room) $ leaveGame pid
STM.modifyTVar' (roomSinks room) $ HMS.delete pid
syncRoom :: Room -> IO ()
syncRoom room = do
(game, sinks) <- atomically $ (,)
<$> STM.readTVar (roomGame room)
<*> STM.readTVar (roomSinks room)
for_ (HMS.toList sinks) $ \(pid, sink) -> do
let view = gameViewForPlayer pid game
warning $ "New state: " ++ show view
sink . Aeson.encode $ SyncGameView view
wsApp :: Server -> WS.ServerApp
wsApp server pc = case routePendingConnection pc of
Nothing -> WS.rejectRequest pc "Invalid URL"
Just roomId -> do
room <- getOrCreateRoom server roomId
conn <- WS.acceptRequest pc
let sink = WS.sendTextData conn
WS.withPingThread conn 30 (pure ()) $ bracket
(atomically $ joinRoom room sink)
(\playerId -> do
atomically $ leaveRoom room playerId
syncRoom room)
(\playerId -> do
syncRoom room
cards <- fmap (^. gameCards) . atomically . STM.readTVar $
roomGame room
sink . Aeson.encode $ SyncCards cards
loop conn roomId playerId)
where
loop conn roomId playerId = forever $ do
msg <- WS.receiveData conn
case Aeson.decode msg of
Just cm -> do
warning $ "Client: " ++ show cm
room <- getOrCreateRoom server roomId -- TODO: only get?
atomically . STM.modifyTVar' (roomGame room) $
processClientMessage playerId cm
syncRoom room
Nothing -> do
warning $ "Could not decode client message: " ++ show msg
splitPath :: T.Text -> [T.Text]
splitPath = filter (not . T.null) . T.split (== '/')
baseUrl :: [T.Text] -> Wai.Middleware
baseUrl prefix application = \req ->
case L.stripPrefix prefix (Wai.pathInfo req) of
Nothing -> application req
Just path -> application req
{ Wai.pathInfo = path
, Wai.rawPathInfo = fromMaybe (Wai.rawPathInfo req) .
B.stripPrefix bs $ Wai.rawPathInfo req
}
where
bs = T.encodeUtf8 $ "/" <> T.intercalate "/" prefix
main :: IO ()
main = do
host <- fromString <$> getEnv "CAFP_HOSTNAME"
port <- read <$> getEnv "CAFP_PORT"
base <- splitPath . T.pack <$> getEnv "CAFP_BASE"
let settings = Warp.setPort port . Warp.setHost host $ Warp.defaultSettings
server <- newServer
sapp <- scottyApp
Warp.runSettings settings $ baseUrl base $
WaiWs.websocketsOr WS.defaultConnectionOptions (wsApp server) sapp
|
