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| 1 | +{-# LANGUAGE OverloadedRecordDot #-} |
| 2 | + |
| 3 | +module Network.Transport.QUIC ( |
| 4 | + createTransport, |
| 5 | + QUICAddr (..), |
| 6 | +) where |
| 7 | + |
| 8 | +import Control.Concurrent.Async qualified as Async |
| 9 | +import Control.Concurrent.STM (atomically) |
| 10 | +import Control.Concurrent.STM.TQueue |
| 11 | +import Data.ByteString qualified as BS |
| 12 | +import Data.Map.Strict (Map) |
| 13 | +import GHC.IORef (atomicModifyIORef') |
| 14 | +import Network.QUIC (StreamId) |
| 15 | +import Network.QUIC qualified as QUIC |
| 16 | +import Network.QUIC.Client qualified as QUIC |
| 17 | +import Network.QUIC.Server (defaultServerConfig) |
| 18 | +import Network.QUIC.Server qualified as QUIC.Server |
| 19 | +import Network.Transport (ConnectErrorCode (..), ConnectionId, EndPoint (..), Event (..), NewEndPointErrorCode, Transport (..), TransportError (..)) |
| 20 | +import Network.Transport.Internal (mapIOException) |
| 21 | + |
| 22 | +import Network.Socket (HostName, ServiceName, getAddrInfo) |
| 23 | + |
| 24 | +{- | Create a new Transport. |
| 25 | +
|
| 26 | +Only a single transport should be created per Haskell process |
| 27 | +(threads can, and should, create their own endpoints though). |
| 28 | +-} |
| 29 | +createTransport :: QUICAddr -> IO Transport |
| 30 | +createTransport quicAddr = do |
| 31 | + pure $ Transport (newEndpoint quicAddr) closeTransport |
| 32 | + |
| 33 | +data QUICAddr = QUICAddr |
| 34 | + { quicBindHost :: !HostName |
| 35 | + , quicBindPort :: !ServiceName |
| 36 | + } |
| 37 | + |
| 38 | +newEndpoint :: QUICAddr -> IO (Either (TransportError NewEndPointErrorCode) EndPoint) |
| 39 | +newEndpoint quicAddr = do |
| 40 | + eventQueue <- newTQueueIO |
| 41 | + |
| 42 | + (addrInfo : _) <- |
| 43 | + mapIOException (TransportError ConnectNotFound . show) $ |
| 44 | + getAddrInfo |
| 45 | + Nothing |
| 46 | + (Just quicAddr.quicBindHost) |
| 47 | + (Just quicAddr.quicBindPort) |
| 48 | + |
| 49 | + QUIC.Server.run |
| 50 | + defaultServerConfig |
| 51 | + ( \conn -> do |
| 52 | + -- TODO: create a bidirectional stream |
| 53 | + -- which can be re-used for sending |
| 54 | + quicStream <- QUIC.acceptStream conn |
| 55 | + -- TODO: how to ensure positivity of ConnectionId? QUIC StreamID should be a 62 bit integer, |
| 56 | + -- so there's room to make it a positive 64 bit integer (ConnectionId ~ Word64) |
| 57 | + let connId = fromIntegral (QUIC.streamId quicStream) |
| 58 | + receiveLoop connId quicStream eventQueue |
| 59 | + ) |
| 60 | + |
| 61 | + pure . Right $ |
| 62 | + EndPoint |
| 63 | + (atomically (readTQueue eventQueue)) |
| 64 | + _ |
| 65 | + _ |
| 66 | + _ |
| 67 | + _ |
| 68 | + _ |
| 69 | + where |
| 70 | + receiveLoop :: |
| 71 | + ConnectionId -> |
| 72 | + QUIC.Stream -> |
| 73 | + TQueue Event -> |
| 74 | + IO () |
| 75 | + receiveLoop connId stream eventQueue = do |
| 76 | + incoming <- QUIC.recvStream stream 1024 -- TODO: variable length? |
| 77 | + -- TODO: check some state whether we should stop all connections |
| 78 | + if BS.null incoming |
| 79 | + then do |
| 80 | + atomically (writeTQueue eventQueue (ConnectionClosed connId)) |
| 81 | + else do |
| 82 | + atomically (writeTQueue eventQueue (Received connId [incoming])) |
| 83 | + receiveLoop connId stream eventQueue |
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