wai: a carousel schedule extends, what a receiver needs rides in band, a node schedules its own instance, and Raptor #658
2026-11-05
wai dev's test: the stand-in room service listens without a reverse lookup
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tests/cli_studio.rs failed on every run on one macOS runner and passed on
every other runner, 3 of 3 against 19 of 19 on 5 November, with "the room
service's clock on the relay: not within 30 s".
The stand-in room service starts an HTTPServer, whose server_bind calls
socket.getfqdn before the server listens. On that host, under the runner's
Python 3.15.2, getfqdn("127.0.0.1") takes 35 s, past the 30 s wai dev waits, and
a stack dump of the stalled stand-in shows it there. The stand-in relay opens a
plain socket and answers in 0.1 s. Nothing here reads the name, so the fixture
no longer asks for it.
On that host and Python the room stand-in took 35.5 s and now takes 0.12 s. A
socket.getfqdn planted to stall for 40 s fails the test without this change,
with the same message, and passes with it.
Changelog: none
Co-Authored-By: Claude Opus 5.5 <[email protected]>
wai: a schedule names Raptor (RFC 5053), the code MBMS download uses
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Carousel §4.1, §5.5: an entry's fec may be raptor (FEC Encoding ID 1), with RFC 5053's F, T, Z, N and Al, held to its fields and to its block sizes, 4 to 8,192 source symbols, with ESIs in 16 bits. 3GPP TS 26.346 §7.2.2 requires a receiver of MBMS download to support the code. Carousel §5.3: RFC 5053 states no bound on a decoder's failure. An independent implementation failed on 14 to 31 blocks in 100 at K + 2, so a Raptor block is held at K and a margin set by measurement, 8, 16 or 28 at overhead 0, 1 or 2, and failure_one_in is null. tests/carousel.rs decodes each Raptor object a case holds available with that implementation, a new development dependency, holds a fixed sample of it to the measurement, and keeps the measurement as an ignored test. no-code stays the default, and carousel §11 keeps the IETF's disclosures on RFC 5053 for implementers. Co-Authored-By: Claude Opus 5.5 <[email protected]>
wai: a §9 line of cache-authority with a ladder
Cache-authority §9 derives timeliness §6.3's lines for an entry from all three kinds of held-at statement. Its text and its corpus still spoke of one fallback. The text now reads every rung, and states a ladder's line as timeliness §6.3 does, the list of each rung's least instant. The corpus writes a line through timeliness' own form, which it did not: an array's instants were lost. The case timeliness_line_ladder holds a rung in the group and a rung in another: each held alone, on time over both, and the first late with the second in time. wai-rs and cache_authority_verify.py reach it, the verifier with two more mutated copies and a weakened check that reads only the first rung. Co-Authored-By: Claude Opus 5.5 <[email protected]>
wai: a later schedule adds passes, what a receiver needs rides on the bearer, and a node schedules its own one-way sending
Carousel §4.5 and §6.2 step 4: along their chain, a later schedule of one instance that keeps every earlier entry, with at least its passes at the same instants sending the same symbols, extends the one before it and may add objects. The last stands and the earlier are labelled `extended`. A schedule that drops an object, or withdraws, moves or changes a pass, still sets aside every schedule of its instance. Timeliness plans read the same schedule. Carousel §8.1 and §8.2: on an instance whose schedule stands, the publisher sends the group receipt, its claims from the head of their chain to the instance's last schedule, and the head of its origin's key log, at least once per the schedule's interval. A verifier given what a receiver acquired checks that it suffices: inband_chain_incomplete, inband_not_scheduled or inband_key_log_missing otherwise. Cache-authority §5.6, §7.2 step 4, §7.3 and carousel §4.3 step 2: a node states its plan for its own cache instance in a schedule claim signed by its own key. The cache verdict reads schedules, publisher's and nodes', sets aside another key's schedule of a node's instance (cache_schedule_signer_mismatch), and holds a statement of carousel §6.4 to the schedule that stands. A node's schedule credits nothing. Vectors for each rule in the carousel, timeliness and cache-authority corpora, verified by wai-rs and by the Python verifiers, each with mutated copies and weakened checks for the new rules. On the timeliness ladder: a plan and a run take a rung over a schedule a later one extends, a plan loses it over the same two withdrawing a pass, and timeliness §7.5.1 says a run does not date its claims. Co-Authored-By: Claude Opus 5.5 <[email protected]>