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kcp: recover from a silent peer on the endpoint's own clock

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KCP is the other transport with nothing to receive when the peer dies, and it
was the slower of the two: its endpoint reaps a connection only after 60s
without a packet, which is past the 30s inactivity timeout above it, so in
practice nothing but that timeout ever noticed.

The endpoint already tracks when each connection last heard from its peer and
now exposes it, so this reads that rather than anything derived from the session
loop - it keeps answering while that loop is busy sending. Its liveness ping now
goes out about every 2s rather than every 10s, so silence means the peer rather
than an idle link, and eight seconds of it is several missed pings.

Same threshold and the same recovery as the WebRTC half, so a user sees the same
thing on either transport.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019aokqJuhjvB3kijXtAg5Ns
This commit is contained in:
rustdesk
2026-09-08 15:05:00 +08:00
parent 70e2893e57
commit 860ffe77a8
3 changed files with 31 additions and 12 deletions
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Cargo.lock generated
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@@ -4280,7 +4280,7 @@ dependencies = [
[[package]]
name = "kcp-sys"
version = "0.1.0"
source = "git+https://github.com/rustdesk-org/kcp-sys?branch=rustdesk-patches#023a0065398968989f2ddfcf5cc72bb886d02675"
source = "git+https://github.com/rustdesk-org/kcp-sys?branch=rustdesk-patches#938eda3e5e9757a612385503af7a6cb1189b2cdd"
dependencies = [
"anyhow",
"auto_impl",