feat(transport): add experimental QUIC Transport (not production ready) #725
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| Original file line number | Diff line number | Diff line change |
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| import std/sequtils | ||
| import pkg/chronos | ||
| import pkg/chronicles | ||
| import pkg/quic | ||
| import ../multiaddress | ||
| import ../multicodec | ||
| import ../stream/connection | ||
| import ../wire | ||
| import ../muxers/muxer | ||
| import ../upgrademngrs/upgrade | ||
| import ./transport | ||
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| export multiaddress | ||
| export multicodec | ||
| export connection | ||
| export transport | ||
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| logScope: | ||
| topics = "libp2p quictransport" | ||
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| type | ||
| P2PConnection = connection.Connection | ||
| QuicConnection = quic.Connection | ||
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| # Stream | ||
| type QuicStream* = ref object of P2PConnection | ||
| stream: Stream | ||
| cached: seq[byte] | ||
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| proc new( | ||
| _: type QuicStream, stream: Stream, oaddr: Opt[MultiAddress], peerId: PeerId | ||
| ): QuicStream = | ||
| let quicstream = QuicStream(stream: stream, observedAddr: oaddr, peerId: peerId) | ||
| procCall P2PConnection(quicstream).initStream() | ||
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There was a problem hiding this comment. You should specify an objName for |
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| quicstream | ||
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| template mapExceptions(body: untyped) = | ||
| try: | ||
| body | ||
| except QuicError: | ||
| raise newLPStreamEOFError() | ||
| except CatchableError: | ||
| raise newLPStreamEOFError() | ||
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There was a problem hiding this comment. After a recent discussion with @Ivansete-status, I think those errors need a small rework, they lack precision (not in this PR though). But nevertheless, everytime you use |
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| method readOnce*( | ||
| stream: QuicStream, pbytes: pointer, nbytes: int | ||
| ): Future[int] {.async: (raises: [CancelledError, LPStreamError]).} = | ||
| try: | ||
| if stream.cached.len == 0: | ||
| stream.cached = await stream.stream.read() | ||
| result = min(nbytes, stream.cached.len) | ||
| copyMem(pbytes, addr stream.cached[0], result) | ||
| stream.cached = stream.cached[result ..^ 1] | ||
| except CatchableError as exc: | ||
| raise newLPStreamEOFError() | ||
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| {.push warning[LockLevel]: off.} | ||
| method write*( | ||
| stream: QuicStream, bytes: seq[byte] | ||
| ) {.async: (raises: [CancelledError, LPStreamError]).} = | ||
| mapExceptions(await stream.stream.write(bytes)) | ||
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| {.pop.} | ||
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| method closeImpl*(stream: QuicStream) {.async: (raises: []).} = | ||
| try: | ||
| await stream.stream.close() | ||
| except CatchableError as exc: | ||
| discard | ||
| await procCall P2PConnection(stream).closeImpl() | ||
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| # Session | ||
| type QuicSession* = ref object of P2PConnection | ||
| connection: QuicConnection | ||
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There was a problem hiding this comment. I'm not sure to understand why you need two P2PConnections here (with QuicSession and QuicStream). It's a bit confusing. And I think it's better to create your custom |
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| method close*(session: QuicSession) {.async, base.} = | ||
| await session.connection.close() | ||
| await procCall P2PConnection(session).close() | ||
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| proc getStream*( | ||
| session: QuicSession, direction = Direction.In | ||
| ): Future[QuicStream] {.async.} = | ||
| var stream: Stream | ||
| case direction | ||
| of Direction.In: | ||
| stream = await session.connection.incomingStream() | ||
| of Direction.Out: | ||
| stream = await session.connection.openStream() | ||
| await stream.write(@[]) # QUIC streams do not exist until data is sent | ||
| return QuicStream.new(stream, session.observedAddr, session.peerId) | ||
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| method getWrapped*(self: QuicSession): P2PConnection = | ||
| nil | ||
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| # Muxer | ||
| type QuicMuxer = ref object of Muxer | ||
| quicSession: QuicSession | ||
| handleFut: Future[void] | ||
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| method newStream*( | ||
| m: QuicMuxer, name: string = "", lazy: bool = false | ||
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There was a problem hiding this comment. I don't think the |
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| ): Future[P2PConnection] {. | ||
| async: (raises: [CancelledError, LPStreamError, MuxerError]) | ||
| .} = | ||
| try: | ||
| return await m.quicSession.getStream(Direction.Out) | ||
| except CatchableError as exc: | ||
| raise newException(MuxerError, exc.msg, exc) | ||
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| proc handleStream(m: QuicMuxer, chann: QuicStream) {.async.} = | ||
| ## call the muxer stream handler for this channel | ||
| ## | ||
| try: | ||
| await m.streamHandler(chann) | ||
| trace "finished handling stream" | ||
| doAssert(chann.closed, "connection not closed by handler!") | ||
| except CatchableError as exc: | ||
| trace "Exception in mplex stream handler", msg = exc.msg | ||
| await chann.close() | ||
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| method handle*(m: QuicMuxer): Future[void] {.async: (raises: []).} = | ||
| try: | ||
| while not m.quicSession.atEof: | ||
| let incomingStream = await m.quicSession.getStream(Direction.In) | ||
| asyncSpawn m.handleStream(incomingStream) | ||
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There was a problem hiding this comment. If you find an alternative to the asyncspawn, it would be great. |
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| except CatchableError as exc: | ||
| trace "Exception in mplex handler", msg = exc.msg | ||
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| method close*(m: QuicMuxer) {.async: (raises: []).} = | ||
| try: | ||
| await m.quicSession.close() | ||
| m.handleFut.cancel() | ||
| except CatchableError as exc: | ||
| discard | ||
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| # Transport | ||
| type QuicUpgrade = ref object of Upgrade | ||
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| type QuicTransport* = ref object of Transport | ||
| listener: Listener | ||
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There was a problem hiding this comment. Same as above, not a fan of un-prefixed object like that. QuicListener is great. There was a problem hiding this comment. This is defined in nim-quic. |
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| connections: seq[P2PConnection] | ||
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| func new*(_: type QuicTransport, u: Upgrade): QuicTransport = | ||
| QuicTransport(upgrader: QuicUpgrade(ms: u.ms)) | ||
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| method handles*(transport: QuicTransport, address: MultiAddress): bool = | ||
| if not procCall Transport(transport).handles(address): | ||
| return false | ||
| QUIC_V1.match(address) | ||
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| method start*(transport: QuicTransport, addrs: seq[MultiAddress]) {.async.} = | ||
| doAssert transport.listener.isNil, "start() already called" | ||
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There was a problem hiding this comment. Should this really be a |
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| #TODO handle multiple addr | ||
| transport.listener = listen(initTAddress(addrs[0]).tryGet) | ||
| await procCall Transport(transport).start(addrs) | ||
| transport.addrs[0] = | ||
| MultiAddress.init(transport.listener.localAddress(), IPPROTO_UDP).tryGet() & | ||
| MultiAddress.init("/quic-v1").get() | ||
| transport.running = true | ||
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| method stop*(transport: QuicTransport) {.async.} = | ||
| if transport.running: | ||
| for c in transport.connections: | ||
| await c.close() | ||
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There was a problem hiding this comment. What about something like that: There was a problem hiding this comment. Is there any semantic difference? Not sure if it adds enough value to justify the change. |
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| await procCall Transport(transport).stop() | ||
| await transport.listener.stop() | ||
| transport.running = false | ||
| transport.listener = nil | ||
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| proc wrapConnection( | ||
| transport: QuicTransport, connection: QuicConnection | ||
| ): P2PConnection {.raises: [Defect, TransportOsError, LPError].} = | ||
| let | ||
| remoteAddr = connection.remoteAddress() | ||
| observedAddr = | ||
| MultiAddress.init(remoteAddr, IPPROTO_UDP).get() & | ||
| MultiAddress.init("/quic-v1").get() | ||
| conres = QuicSession(connection: connection, observedAddr: Opt.some(observedAddr)) | ||
| conres.initStream() | ||
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| transport.connections.add(conres) | ||
| proc onClose() {.async.} = | ||
| await conres.join() | ||
| transport.connections.keepItIf(it != conres) | ||
| trace "Cleaned up client" | ||
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| asyncSpawn onClose() | ||
| return conres | ||
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| method accept*(transport: QuicTransport): Future[P2PConnection] {.async.} = | ||
| doAssert not transport.listener.isNil, "call start() before calling accept()" | ||
| let connection = await transport.listener.accept() | ||
| return transport.wrapConnection(connection) | ||
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| method dial*( | ||
| transport: QuicTransport, | ||
| hostname: string, | ||
| address: MultiAddress, | ||
| peerId: Opt[PeerId] = Opt.none(PeerId), | ||
| ): Future[P2PConnection] {.async, gcsafe.} = | ||
| let connection = await dial(initTAddress(address).tryGet) | ||
| return transport.wrapConnection(connection) | ||
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There was a problem hiding this comment. You should probably check if |
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| method upgrade*( | ||
| self: QuicTransport, conn: P2PConnection, peerId: Opt[PeerId] | ||
| ): Future[Muxer] {.async: (raises: [CancelledError, LPError]).} = | ||
| let qs = QuicSession(conn) | ||
| if peerId.isSome: | ||
| qs.peerId = peerId.get() | ||
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| let muxer = QuicMuxer(quicSession: qs, connection: conn) | ||
| muxer.streamHandler = proc(conn: P2PConnection) {.async: (raises: []).} = | ||
| trace "Starting stream handler" | ||
| try: | ||
| await self.upgrader.ms.handle(conn) # handle incoming connection | ||
| except CancelledError as exc: | ||
| return | ||
| except CatchableError as exc: | ||
| trace "exception in stream handler", conn, msg = exc.msg | ||
| finally: | ||
| await conn.closeWithEOF() | ||
| trace "Stream handler done", conn | ||
| muxer.handleFut = muxer.handle() | ||
| return muxer | ||
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I'm not a huge fan of this un-prefixed
Stream. Maybe renaming itQuicStreamand renaming the currentQuicStreamintoLPQuicStreamwill be clearer.