docs: describe the iroh P2P transport - #2938
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iroh was reachable but undocumented: the only prose was a two-line comment in the relay config reference and a feature bullet on the home page. Nothing explained what dialing an endpoint id buys you, how a peer behind a NAT is reached, or which of the shared QUIC knobs the backend quietly ignores. Add /concept/layer/iroh as a transport-layer page alongside quic, web-transport, and web-socket, covering addressing (the endpoint id is the ed25519 public key, so no CA and no mTLS identity), connectivity (discovery, hole punching, iroh relay fallback), the ALPN-negotiated binding that decides whether the request path rides the SETUP or the CONNECT URL, the --iroh-* surface, and the limitations that come from running on noq rather than quinn. Also document the [iroh] relay options that existed in EndpointConfig but appeared in no doc (bind_v4, bind_v6, disable_relay), and note that a missing secret means a new endpoint id on every restart. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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WalkthroughAdded documentation for the experimental, native-only iroh transport. The documentation covers endpoint addressing, discovery, hole punching, relay fallback, QUIC and ALPN behavior, authentication, configuration, secret persistence, CLI usage, cargo features, library integration, and transport limitations. Added iroh navigation entries to the Concepts → Layers documentation. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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In `@doc/concept/layer/iroh.md`:
- Line 39: Add the text language identifier to the opening fenced code blocks at
the locations corresponding to lines 39 and 118, ensuring both fences satisfy
markdownlint MD040.
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markdownlint MD040 flags a fence with no language. `text` is what the other hand-written pages use for non-code blocks (see web-socket.md). Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
noq defaults to CUBIC too, and for the same reason: it shares the BBRv3 that can underflow and panic on loss. Only quinn and quiche default to BBR, which is what the table in doc/bin/relay/config.md already said. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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In `@doc/concept/layer/iroh.md`:
- Around line 180-183: No implementation change is requested by this comment;
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| - **Congestion control defaults to CUBIC**, unlike the quinn and quiche backends, which | ||
| default to BBR. iroh shares noq's BBRv3, which can underflow and panic on a packet loss, | ||
| so delay-based control stays reachable only when an operator asks for it by name. The | ||
| noq backend defaults to CUBIC for the same reason. See the |
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In `@doc/concept/layer/iroh.md` around lines 180 - 183, No implementation change
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Summary
/concept/layer/irohas a transport-layer page next to quic, web-transport, and web-socket, wired into the sidebar and the layers index.--iroh-disable-relay); the ALPN-negotiated binding, which is why aniroh://path lands in either the moq-lite SETUP or the H3 CONNECT URL depending on the peer; the full--iroh-*flag/env table; and the limitations that come from running on noq rather than quinn.The limitations section is the part worth a reviewer's eye, since it was read out of the code rather than assumed:
EndpointConfig::bindtakes&quic::Client, so[client.quic]applies to both roles and[server.quic]never reaches iroh.--client-quic-gso=falseis refused outright (Error::GsoUnsupported), not ignored.iroh://without--iroh-enablederrors (Error::IrohDisabled) rather than silently falling back.Also
doc/bin/relay/config.mddocumented onlyenabledandsecret. Addedbind_v4,bind_v6, anddisable_relay, which existed inEndpointConfigbut appeared in no doc, plus a note that a missingsecretmeans a new endpoint id on every restart (and therefore a stale URL for anyone who wrote the old one down).Public API changes
None. Docs only.
Test plan
/code-reviewafter the Codex reviewer hit its usage quota. It caught one factual error (the congestion-control claim above), fixed in 2c73f61; every other technical claim was verified against source.just fixandjust checkpass. The docs check runstsc --noEmit, the.vitepressunit tests, and a fullvitepress build, which is what validates the internal links.#irohfollows the existing#statsprecedent from### \[stats]. The congestion-control note links to/bin/relay/configwithout an anchor, since that heading is### \[server.quic] and \[client.quic]and its slug is not worth relying on.irohis on formoq-cliandmoq-relay, off formoq-native), and theiroh listening endpoint_id=...log line were each read back from the source rather than recalled.Cross-package sync
The
rs/moq-relayconfig row is covered (doc/bin/relay/). No code changed, so no other row applies.Client::with_iroh_addrshas no CLI flag, so it is documented only as a library API.(Written by Opus 5)