13976667ed
Pinging @gregwebs and @meteficha. Greg: I know you were talking about Sockets.IO support, and Felipe: I thought you might be curious about this relative to yesod-eventsource. Comments welcome :)
61 lines
2.1 KiB
Haskell
61 lines
2.1 KiB
Haskell
{-# LANGUAGE FlexibleContexts #-}
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{-# LANGUAGE MultiParamTypeClasses #-}
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module Yesod.WebSockets
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( WebsocketsT
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, webSockets
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, receiveData
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, sendTextData
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, sendBinaryData
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) where
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import Control.Monad (when)
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import Control.Monad.IO.Class (MonadIO (liftIO))
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import Control.Monad.Trans.Control (control)
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import Control.Monad.Trans.Reader (ReaderT (ReaderT, runReaderT))
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import qualified Network.Wai.Handler.WebSockets as WaiWS
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import qualified Network.WebSockets as WS
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import qualified Yesod.Core as Y
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-- | A transformer for a WebSockets handler.
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--
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-- Since 0.1.0
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type WebsocketsT = ReaderT WS.Connection
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-- | Attempt to run a WebSockets handler. This function first checks if the
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-- client initiated a WebSockets connection and, if so, runs the provided
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-- application, short-circuiting the rest of your handler. If the client did
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-- not request a WebSockets connection, the rest of your handler will be called
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-- instead.
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--
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-- Since 0.1.0
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webSockets :: (Y.MonadBaseControl IO m, Y.MonadHandler m) => WebsocketsT m () -> m ()
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webSockets inner = do
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req <- Y.waiRequest
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when (WaiWS.isWebSocketsReq req) $
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Y.sendRawResponse $ \src sink -> control $ \runInIO -> WaiWS.runWebSockets
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WS.defaultConnectionOptions
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(WaiWS.getRequestHead req)
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(\pconn -> do
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conn <- WS.acceptRequest pconn
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runInIO $ runReaderT inner conn)
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src
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sink
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-- | Receive a piece of data from the client.
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--
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-- Since 0.1.0
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receiveData :: (MonadIO m, WS.WebSocketsData a) => WebsocketsT m a
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receiveData = ReaderT $ liftIO . WS.receiveData
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-- | Send a textual messsage to the client.
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--
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-- Since 0.1.0
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sendTextData :: (MonadIO m, WS.WebSocketsData a) => a -> WebsocketsT m ()
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sendTextData x = ReaderT $ liftIO . flip WS.sendTextData x
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-- | Send a binary messsage to the client.
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--
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-- Since 0.1.0
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sendBinaryData :: (MonadIO m, WS.WebSocketsData a) => a -> WebsocketsT m ()
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sendBinaryData x = ReaderT $ liftIO . flip WS.sendBinaryData x
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