QA sweep: three silent leaks, and cut the overzoom raster cost in half

viberfox-agent commented

2026-08-10 19:33:54 +00:00

Collaborator

Closes #37

viberfox-agent added 9 commits

2026-08-10 19:33:55 +00:00

fix(net): keep a dying connection from leaking its avatar 1140dddbe4

`handle_connection` ends in the teardown that unregisters the chat inbox
and removes the avatar from `SimWorld`. Two of the three `select!` arms
reach it correctly, by assigning `outcome` and breaking. The incoming-frame
arm did not: its 23 fallible steps — the `decode_app_frame`, every
`encode_app_frame`, every `framed.send` — were bare `?`, which returns out
of the function and jumps clean over the teardown.

So one undecodable frame from an authenticated client leaked its avatar
permanently. That is not a quiet leak: `SimWorld::snapshot` replicates
every avatar to every client, so the ghost is broadcast to everyone at the
tick rate for the life of the process, and a reconnect-and-send-garbage
loop grows both the avatar map and every snapshot frame without bound.

Scoping the arm in an `async` block rather than rewriting 23 call sites
keeps the `?`s and catches them in one place. The rate-limit skips inside
become `return Ok(())`: the block is the loop body's continuation, so a
`continue` would no longer mean what it says. None of the six sat inside a
nested loop, so this is an exact translation.

The test drives real loopback TCP with two clients and watches the avatar
count in the snapshots the *second* one receives — it reports "still 2 in
the world" against the old code.

fix(stream): stop a forgotten cell leaking a concurrency slot b3ba376d0f

`CellStream::forget` dropped a cell from `requested` and released its
in-flight slot, but left it sitting in the dispatcher's queue. A cell that
is queued-but-not-started is the common case at that call site —
`osm_buildings::evict_far_cell` forgets cells requested before the coverage
manifest loaded, as its own comment says — so the next `request` for the
same key (a layer toggled back on, the camera returning) enqueued a second
copy behind the first.

Both copies were then dispatched. `next_job` ignored the `HashSet::insert`
return, so the second one bumped `Dispatcher::in_flight` again while the
set stayed the same size; the single result released it once. The counter
never came back down and the concurrency cap was one slot smaller for the
rest of the run.

That is fatal where the cap is 1. The far-building lane against a public
Overpass endpoint runs at `max_in_flight = 1`, so the first leak stops it
dead: far buildings never load again, nothing logs, and `CellStream::busy`
stays true, which also means a `--shot --settle` run never quiesces.

Fixed at the root — `forget` prunes the queue — and guarded in `next_job`,
which now hands the slot straight back if a key is dispatched twice by any
other path. The set was chosen over a counter precisely because "a set
cannot leak a slot" (its doc comment); that only holds if every dispatch
is paired with exactly one completion, which is what the guard restores.

perf(nav): refuse an impossible corridor before walking the bounding box 7a0e78464e

`corridor_tiles_at`'s doc comment has always claimed it "refuses early,
before building the list". It did not: the nested loop walked the entire
bounding box of the two endpoints, testing every tile against the capsule,
and only counted the survivors against `limit` afterwards.

For an intercontinental pair that box is enormous — Amsterdam→Sydney spans
~6,600 x ~5,000 tiles at `ROUTING_ZOOM` — so the planner ran ~3e7
iterations of `hypot` plus `point_seg_distance` on the calling thread to
produce a `TooFar` derivable from the endpoints alone, and `plan_corridor`
then did it a second time at `LONG_HAUL_ZOOM`.

The new test is a genuine *lower* bound on what the loop would have
collected, so it cannot refuse a route the loop would have accepted: the
capsule contains the segment, and a segment spanning `span` tiles along its
longer axis enters at least that many distinct tiles. The existing
`the_planner_steps_down_a_tier_rather_than_refusing` sweep covers the other
direction — that nothing routable became unroutable.

Also fixes `format_distance` printing "1000 m": it branched on the raw
metres and rounded to the nearest 10 afterwards, so anything in [995, 1000)
crossed the unit boundary after the branch had been chosen.

perf(weather): drop the rain shell out of the frame when it is dry 7d29b7da35

The rain shell was spawned with no visibility management and `update_rain`
never hid it, so a dry world still drew a full-viewport alpha-blended pass
every frame. `rain.wgsl` runs three `rain_layer` octaves per fragment —
each with two hashes, three smoothsteps and a step — and multiplies the
result by the intensity only at the very end, so at `precipitation == 0`
every one of those fragments is computed to reach a guaranteed zero.

Dry is the common case: it is what met.no reports most of the time, and it
is the state of every scripted `--shot` run unless `--rain` says otherwise.

`update_clouds` in this same file already solves this for its own 360 km
box, in the same words ("drop the shell out of the frame entirely once it
carries no cloud, rather than blending a fully transparent box over the
whole view"); the rain shell simply never got the same treatment. Hiding it
also skips the material write, which was re-uploading a constant tint and a
zero intensity every frame.

Also resolves `VIBERFOX_CLOUD_TIME` once into a `Local` instead of calling
`std::env::var` — a global lock plus an allocation — on every frame the
globe clouds are visible. It is a debug seed; it cannot change mid-run.

**Visually unverified**: this container has no GPU or Vulkan driver, so the
`--rain 1` case needs `cargo shots` on a workstation to confirm rain still
renders. The unit suite (273 tests) is green.

perf(avatar): reuse the animation phase-lock buffers across frames e8fdbfa01a

`sync_avatar_animations` allocated two `Vec`s per avatar per frame and only
then checked whether it had anything to do. The check it makes is
`holder_players.len() < 2`, and a preset avatar — all four slots taken from
one character style — resolves to exactly one holder, so the common case
paid both allocations to immediately `continue`.

The cost scales with the crowd, not the local player: the system runs over
`Avatar` and every `RemoteAvatar`, so a busy region multiplies it.

Hoisting both into `Local`s keeps the behaviour identical and drops the
per-frame allocation to zero once the buffers reach their high-water mark.
The descendant walk itself stays — removing that means recording the
resolved `AnimationPlayer` entities on the avatar at spawn, which is a
larger change than this one.

perf(geo): skip features that miss the overzoomed sub-tile window 1541ab34ea

Shortbread tops out at z14 while `map_stream` streams to z17, so a deep tile
renders a sub-rectangle of its z14 ancestor. The transform was doing that
correctly and the feature loop was ignoring it: every feature in the source
body was turned into a path and handed to tiny-skia, even when only 1/64 of
the tile could land on the pixmap.

Nothing downstream rescued it. tiny-skia 0.11's `fill_path` clones and
transforms the whole path before any bounds test (its `// TODO: ignore paths
outside the pixmap` is still in the source), and `stroke_path` constructs
the entire round-joined stroke outline first. The width scaling makes the
deep case the expensive one: `buildings`' 0.6 px outline is a cheap hairline
at factor 1 and a 4.8 px stroked outline at factor 8, over the ~8,500
building features in the Groningen fixture, twice per render.

Measured on that fixture with the new `bench_overzoom_cull` hatch (this
container, all sub-tiles of each factor):

| factor | before | after |
|---|---|---|
| 2 (z15) | 144.4 ms | 140.6 ms |
| 4 (z16) | 123.1 ms |  78.5 ms |
| 8 (z17) |  84.9 ms |  41.0 ms |

Factor 2 barely moves — a quarter-tile window still catches most features —
and that is the honest shape of it: the win arrives exactly where the tiles
are numerous and deep. `map_stream`'s own test pins 179 overzoomed tiles per
fresh anchor, against a cold settle of 7.5–9.8 s.

The correctness gate is `culling_off_screen_features_changes_no_pixels`,
which renders seven sub-tiles across factors 2/4/8 with the cull on and off
and asserts byte-identical rasters. That is what pins the margin arithmetic:
too tight a stroke reach or too little anti-alias slack drops a road that
should bleed in from just outside the window, which reads as a seam along a
tile border. Features whose bounds cannot be computed are never culled.

docs(notes): record the overzoom cull, and fix a check that was falsely green 94f575fcfe

`tile-raster-cost.md` recorded that an overzoomed z17 sub-tile cost ~35 ms
against ~121 ms for a whole tile while covering 1/64 of the ground, but not
why. It was the feature loop ignoring the sub-tile transform; the section
now carries the cause, the before/after measurement and the method.

`wasm-performance.md`'s "still untyped `serde_json::Value`" section had
half come true — `lod22.rs` was typed — and its `check:` line had become a
false green: the grep still matched, but only the comment explaining that
the file is *no longer* a `Value` walk. That is the failure mode
`agent-verification.md` describes, so the replacement matches a parse call
rather than a mention, and points at `osm_buildings.rs`, which really is
still untyped. Verified the new pattern by running it.

build(workflow): let the driven lane merge its own branch after CI

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ea074785b9

Landing a change took a round trip through a hand-made PR, which is the one
step in the driven lane that needed a human for permissions rather than for
judgement — the review has already happened in conversation by then.

`merge-to-main` pushes HEAD to the bound branch, waits for CI on the pushed
head, and opens and merges a PR only on green. A red run exits non-zero
naming the failing check, so the session fixes and re-runs. That keeps the
rule this repo already has — the verdict is CI's, not the session's: the
session decides when to ask, never whether it passed.

`main` stays protected, which is the property that makes this safe to hand
an agent. The `viberfox-agent` token reports `user_can_push: false` and
`user_can_merge: true` on main and carries `write:repository` with no admin
scope, so an accidental `git push origin main` from any session still
bounces and this path cannot widen its own permissions. Verified against
the API rather than assumed.

The board needs no new machinery: `Closes #N` in the PR body closes the
issue, and the watcher already moves a closed issue's card to Done.

Two tokens, two scopes — `forgejo.env` stays write:issue only, exactly as
its own comment claims, and the repository-write token sits beside it in
`forgejo-merge.env` (mode 600, outside the repo). Revoking it in Forgejo
disables this path and nothing else.

The autonomous lane is unchanged: it still stops at `agent:done`.

build(workflow): add --no-wait to merge-to-main

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a4b73e6855

An explicit escape hatch from the CI gate, for when the maintainer says to
land it now. It is a flag and not a fallback on purpose: nothing in the
script's own control flow can reach it, so the gate cannot be skipped by a
timeout, a failed status lookup or a session deciding it had waited long
enough. It logs the commit status as it stood at merge time, so the record
says what was and was not known.

`docs/workflow.md` forbids a *session* from judging its own work; a person
choosing to merge ahead of CI is a different call, and one they are allowed
to make. A red run found afterwards gets fixed forward on main.

viberfox-agent added 1 commit

2026-08-10 19:43:41 +00:00

Merge remote-tracking branch 'origin/main' into perf/37-qa-sweep-leaks-and-overzoom

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38a0212342

main gained protocol revision 13 (jump, emotes, gravity arc) and the avatar
game-feel work while this branch was open. One conflict, in
`simulator::net::handle_connection`'s `ClientIntent` arm, where both sides
changed the same rate-limit guard:

* main made jump and emote exempt from it — they are edges, so dropping one
  loses the action outright rather than delaying it.
* this branch changed the skip from `continue` to `return Ok(())`, because
  the arm is now an `async` block scoped so a `?` cannot jump over the
  connection teardown.

Both are kept: main's condition with this branch's early return. The two are
orthogonal — one decides *when* to skip, the other *how* to skip.

Verified on the merged tree: 293 viberfox, 98 geo, 23 core, 16 simulator
tests pass, and `cargo check --workspace --all-targets` is clean.

viberfox-agent merged commit 6335f3d598 into main

2026-08-10 19:43:49 +00:00

viberfox-agent referenced this pull request from a commit

2026-08-10 19:43:51 +00:00

Merge pull request 'QA sweep: three silent leaks, and cut the overzoom raster cost in half' (#40) from perf/37-qa-sweep-leaks-and-overzoom into main

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QA sweep: three silent leaks, and cut the overzoom raster cost in half #40