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|
{-# LANGUAGE OverloadedStrings #-}
module Uplcg.Main.Server
( main
) where
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.Char (isAlphaNum)
import Data.Foldable (for_)
import qualified Data.HashMap.Strict as HMS
import qualified Data.List as L
import Data.Maybe (fromMaybe, isNothing)
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.Log.FastLogger as FL
import System.Random (StdGen, newStdGen)
import qualified Uplcg.CookieSocket as CookieSocket
import Uplcg.Game
import Uplcg.Messages
import qualified Web.Scotty as Scotty
type RoomId = T.Text
type Sink = BL.ByteString -> IO ()
data Room = Room
{ roomId :: RoomId
, roomGame :: TVar Game
, roomSinks :: TVar (HMS.HashMap PlayerId Sink)
}
data Server = Server
{ serverLogger :: FL.FastLogger
, serverCookieSocket :: CookieSocket.Handle Player
, 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 (== '#')
withServer :: FL.FastLogger -> (Server -> IO a) -> IO a
withServer fl f = CookieSocket.withHandle 5 $ \cs -> do
f =<< Server fl cs <$> readCards <*> MVar.newMVar HMS.empty
newRoom :: RoomId -> Cards -> StdGen -> STM Room
newRoom rid cards gen = Room rid
<$> STM.newTVar (newGame cards gen)
<*> STM.newTVar HMS.empty
parseRoomId :: T.Text -> Either String T.Text
parseRoomId txt
| T.all isAlphaNum txt && T.length txt >= 6 = Right txt
| otherwise = Left "Bad room name"
scottyApp :: IO Wai.Application
scottyApp = Scotty.scottyApp $ do
Scotty.get "/rooms/:id/" $ do
rid <- Scotty.param "id"
when (T.length rid < 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", txt, "events"] | Right r <- parseRoomId txt -> Just r
_ -> Nothing
getOrCreateRoom :: Server -> RoomId -> IO Room
getOrCreateRoom server rid = MVar.modifyMVar (serverRooms server) $ \rooms ->
case HMS.lookup rid rooms of
Just room -> pure (rooms, room)
Nothing -> do
gen <- newStdGen
serverLogger server $ "[" <> FL.toLogStr rid <> "] Created room"
room <- atomically $ newRoom rid (serverCards server) gen
pure (HMS.insert rid room rooms, room)
deleteRoom :: Server -> RoomId -> IO ()
deleteRoom server rid = do
serverLogger server $ "[" <> FL.toLogStr rid <> "] Deleting room"
MVar.modifyMVar_ (serverRooms server) $ pure . HMS.delete rid
joinRoom :: Room -> Sink -> Maybe Player -> STM PlayerId
joinRoom room sink mbRecovered = do
pid <- STM.stateTVar (roomGame room) $ joinGame mbRecovered
STM.modifyTVar' (roomSinks room) $ HMS.insert pid sink
pure pid
leaveRoom :: Room -> PlayerId -> STM (Bool, Maybe Player)
leaveRoom room pid = do
player <- STM.stateTVar (roomGame room) $ leaveGame pid
STM.stateTVar (roomSinks room) $ \sinks ->
let sinks' = HMS.delete pid sinks in
((HMS.null sinks', player), sinks')
syncRoom :: Server -> Room -> IO ()
syncRoom server room = do
(game, sinks) <- atomically $ (,)
<$> STM.stateTVar (roomGame room) (\g -> (g, g & gameLog .~ []))
<*> STM.readTVar (roomSinks room)
for_ (reverse $ game ^. gameLog) $ \msg ->
serverLogger server $ "[" <> FL.toLogStr (roomId room) <> "] " <>
FL.toLogStr msg
for_ (HMS.toList sinks) $ \(pid, sink) -> do
let view = gameViewForPlayer pid game
sink . Aeson.encode $ SyncGameView view
wsApp :: Server -> WS.ServerApp
wsApp server pc = case routePendingConnection pc of
Nothing -> WS.rejectRequest pc "Invalid URL"
Just rid -> do
room <- getOrCreateRoom server rid
(conn, secret, mbRecovered) <-
CookieSocket.acceptRequest (serverCookieSocket server) rid pc
let sink = WS.sendTextData conn
WS.withPingThread conn 30 (pure ()) $ bracket
(do
pid <- atomically $ joinRoom room sink mbRecovered
serverLogger server $ "[" <> FL.toLogStr rid <>
"] Player " <> FL.toLogStr pid <>
if isNothing mbRecovered then " joined" else " rejoined"
pure pid)
(\pid -> do
(roomEmpty, mbPlayer) <- atomically $ leaveRoom room pid
serverLogger server $ "[" <> FL.toLogStr rid <>
"] Player " <> FL.toLogStr pid <> " left"
if roomEmpty
then deleteRoom server rid
else do
for_ mbPlayer $ CookieSocket.persist
(serverCookieSocket server) secret
syncRoom server room)
(\playerId -> do
sink . Aeson.encode $ Welcome rid
syncRoom server room
cards <- fmap (^. gameCards) . atomically . STM.readTVar $
roomGame room
sink . Aeson.encode $ SyncCards cards
loop conn rid playerId)
where
loop conn rid playerId = forever $ do
msg <- WS.receiveData conn
case Aeson.decode msg of
Just cm -> do
room <- getOrCreateRoom server rid -- TODO: only get?
atomically . STM.modifyTVar' (roomGame room) $
processClientMessage playerId cm
syncRoom server room
Nothing -> do
serverLogger server $ "Could not decode client message: " <>
FL.toLogStr (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 <$> getEnv "UPLCG_HOSTNAME"
port <- read <$> getEnv "UPLCG_PORT"
base <- splitPath . T.pack <$> getEnv "UPLCG_BASE"
let settings = Warp.setPort port . Warp.setHost host $ Warp.defaultSettings
timeCache <- FL.newTimeCache FL.simpleTimeFormat
FL.withTimedFastLogger timeCache
(FL.LogStderr FL.defaultBufSize) $ \tfl ->
let fl s = tfl (\time -> FL.toLogStr time <> " " <> s <> "\n") in
withServer fl $ \server -> do
sapp <- scottyApp
Warp.runSettings settings $ baseUrl base $
WaiWs.websocketsOr WS.defaultConnectionOptions (wsApp server) sapp
|
