feat(webrtc): add UdpMux for shared-port WebRTC-Direct inbound dispatch#1397
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yashksaini-coder wants to merge 1 commit into
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feat(webrtc): add UdpMux for shared-port WebRTC-Direct inbound dispatch#1397yashksaini-coder wants to merge 1 commit into
yashksaini-coder wants to merge 1 commit into
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Implements _udp_mux.UdpMux — a shared UDP DatagramProtocol that owns a single OS socket and demultiplexes concurrent inbound WebRTC-Direct dials: - Pre-ICE STUN BINDING REQUESTs routed by USERNAME ufrag prefix - Post-ICE DTLS/SCTP frames routed by remote (host, port) - _MuxedTransport adapter gives each aioice.Connection a fake transport backed by the shared socket, bypassing _gather_candidates entirely - add_ice_connection() creates an aioice.Connection with preset local_username/local_password and injects a mux-backed StunProtocol into its _protocols list without binding a new UDP socket Foundational primitive for a spec-aligned WebRTC-Direct listener (libp2p/specs#715) advertising one fixed UDP port in its multiaddr. Closes libp2p#1352.
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Fixes #1352. Recreates #1381, which was auto-closed when the source fork was recreated — same diff, no code changes.
Summary
libp2p/transport/webrtc/_udp_mux.py— aUdpMuxclass (a sharedasyncio.DatagramProtocol) that owns one OS UDP socket and demultiplexes concurrent inbound WebRTC-Direct dialsUSERNAMEufrag prefix (parsed from the STUN message)(host, port)(registered after ICE nomination)_MuxedTransportadapter gives eachaioice.Connectiona fake transport backed by the shared socket, bypassing_gather_candidatesentirely so aioice never binds its own portadd_ice_connection(ufrag, pwd, host=)creates anaioice.Connectionwith presetlocal_username/local_passwordand injects a mux-backedStunProtocolintoconnection._protocolsWhy
Closes the ICE mux gap identified in the spike (#1352). A spec-aligned WebRTC-Direct listener (libp2p/specs#715) must advertise a single fixed UDP port and demux concurrent dials on that port — impossible with the current aioice architecture where each
Connectionbinds its own ephemeral socket.UdpMuxsolves this without modifying aioice.Architecture note
StunProtocolis an internal aioice class. We access it directly because we're injecting into aioice's_protocolslist — intentional monkey-patching. The two# type: ignoreannotations mark aioice'sconnection_lost(exc: Exception)annotation gap (should beOptional[Exception]per asyncio docs).What's next
Follow-up PR: wire
UdpMuxintolistener.pyto replace the current HTTP-signaling harness with a spec-aligned STUN-dispatch listener (WebRTC-Direct v2, libp2p/specs#715).Test plan
uv run pytest tests/core/transport/webrtc/test_udp_mux.py -v→ 11/11 pass (skipped when aioice not installed)uv run make lint→ all pre-commit hooks pass (mypy + pyrefly clean)