blob: ac0c5365011dcb12e8b801d3ddb3157abcb0c8fd (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
|
{-# LANGUAGE OverloadedStrings #-}
module Cafp.Main.Server
( main
) where
import Cafp.Messages
import Control.Concurrent (threadDelay)
import Control.Exception (bracket)
import Control.Concurrent.STM (STM, TVar, atomically)
import qualified Control.Concurrent.STM as STM
import Control.Monad (forever, when)
import qualified Data.Aeson as Aeson
import qualified Data.HashMap.Strict as HMS
import Data.Text (Text)
import qualified Data.Text as T
import qualified Data.ByteString as B
import qualified Data.Text.Encoding as T
import qualified Data.Text.Lazy as TL
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 qualified Web.Scotty as Scotty
type RoomId = T.Text
type PlayerId = Int
type Sink = B.ByteString -> IO ()
data Server = Server
{ serverRooms :: TVar (HMS.HashMap RoomId ())
, serverSinks :: TVar (HMS.HashMap PlayerId Sink)
, serverNextPlayerId :: TVar Int
}
newServer :: STM Server
newServer = Server
<$> STM.newTVar HMS.empty
<*> STM.newTVar HMS.empty
<*> STM.newTVar 0
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"
routePendingConnection :: WS.PendingConnection -> Maybe RoomId
routePendingConnection pending =
let path = T.decodeUtf8 . WS.requestPath $ WS.pendingRequest pending in
case T.split (== '/') path of
[_, "rooms", roomId, "events"] -> Just roomId
_ -> Nothing
wsApp :: Server -> WS.ServerApp
wsApp server pc = case routePendingConnection pc of
Nothing -> WS.rejectRequest pc "Invalid URL"
Just roomId -> do
playerId <- atomically . STM.stateTVar (serverNextPlayerId server) $
\x -> (x, x + 1)
conn <- WS.acceptRequest pc
WS.withPingThread conn 30 (pure ()) $ do
WS.sendTextData conn $ Aeson.encode $ Welcome playerId
bracket
(atomically . STM.modifyTVar (serverSinks server) $
HMS.insert playerId (\bs -> WS.sendTextData conn bs))
(\() -> atomically . STM.modifyTVar (serverSinks server) $
HMS.delete playerId)
(\() -> loop conn)
where
loop conn = forever $ do
WS.sendTextData conn $ Aeson.encode Bye
threadDelay $ 1 * 1000000
main :: IO ()
main = do
let port = 3000
settings = Warp.setPort port Warp.defaultSettings
server <- atomically newServer
sapp <- scottyApp
Warp.runSettings settings $
WaiWs.websocketsOr WS.defaultConnectionOptions (wsApp server) sapp
|
