`trigger_depth` bounds how DEEP a trigger/invoke chain runs, but nothing bounded
how WIDE one execution could fan out. A single anonymous request running
`for i in 0..1_000_000 { invoke_async("w", #{}) }` costs a few Rhai ops plus one
cheap outbox INSERT per iteration, so within the op / wall-clock budget it could
write ~10^5 durable rows — each dispatched as its own execution — flooding the
outbox and dispatcher (a durable-amplification DoS).
Add a per-execution ceiling on DURABLE emissions (`invoke_async`,
`pubsub::publish_durable`, `queue::enqueue`, and the shared-topic/-queue
variants), env `PICLOUD_MAX_EMISSIONS_PER_EXECUTION` (default 1000). It's a
thread-local counter wrapped by a re-entrancy-aware `EmissionBudgetScope` around
every `execute_ast`: the OUTERMOST scope resets it, so a fresh dispatched
handler (a new pooled-thread task) gets a full budget while a synchronous
`invoke()` / interceptor re-entry nested in the same call stack SHARES it (fan-
out counted across the whole synchronous chain). The outermost Drop re-zeroes
the counter so a pooled thread never leaks a count into the next task.
Pinned by an `emit_budget` unit test (outermost resets, nested shares, ceiling
trips); the invoke/queue/pubsub/workflow journeys (small counts) stay green.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
The per-element Rhai sandbox caps (max_string_size 64 KiB, max_array_size /
max_map_size 10 000) do NOT bound the *materialized* size: Rhai shares strings
and arrays by Rc, so a 10 000-element array of one aliased 64 KiB string is
cheap to build (~10 000 ops, far under the 1 M op budget) yet dealiases to
~640 MiB of distinct JSON. Every Dynamic→JSON conversion deep-copies the
aliases; the HTTP response body path had NO size cap at all, and the KV/docs
value caps run only AFTER full materialization — so a handful of anonymous
requests could OOM the node (32 concurrent × ~640 MiB ≈ 20 GiB) on the stated
consumer-hardware target.
Add a byte-budgeted materializer that bails the moment the budget is exceeded,
so the transient allocation is bounded regardless of aliasing:
- bridge.rs: `dynamic_to_json_capped(value, max) -> Result<Json, JsonSizeError>`
(charges a running budget) + `MAX_JSON_MATERIALIZE_BYTES` (16 MiB hard rail,
far above the 256 KiB business caps). `dynamic_to_json` stays infallible for
best-effort paths (logging) but is now internally bounded — it collapses an
over-limit value to a marker string instead of OOMing.
- Route every user-value boundary through the fail-closed capped form: KV
set/set_if (+ the CAS `expected`), docs create/update/find, secrets set,
http request body, workflow input, `json::stringify`, and the HTTP RESPONSE
body (previously the one fully-uncapped exit → now a 500). `invoke` args and
the pubsub/queue message materializers get the same byte budget in place.
- `impl From<JsonSizeError> for Box<EvalAltResult>` so SDK sites protect
themselves with a bare `?`.
Pinned by bridge unit tests: an aliased 10 000×64 KiB array errors on the
budget rather than materializing, and the infallible wrapper yields a marker
instead of OOMing. Workspace 914 + journeys 157/157 green.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
The runtime for shared topics:
- pubsub_repo: fan_out_publish gains `AND t.shared = FALSE` (a shared
trigger never fires on a per-app publish); new fan_out_shared_publish
matches `shared = true` pubsub triggers on the resolved owning group,
each delivery stamped with the writer app_id (M2 model).
- GroupPubsubService trait (shared) + GroupPubsubServiceImpl: resolve the
owning group (kind='topic') from cx.app_id's chain, require editor+
(GroupPubsubPublish, fails closed for anon), size-cap, fan out.
- SDK: `pubsub::shared_topic("name")` -> GroupTopicHandle with
`.publish(subtopic, msg)` / `.publish(msg)`; wired through Services +
the picloud binary (reuses the one PubsubRepo).
- authz: Capability::GroupPubsubPublish(GroupId), editor+ / script:write.
The owning-group chain walk is the isolation boundary; a sibling-subtree
app never resolves the topic.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Whitespace + import-grouping fixups in the 9 SDK modules touched by
F-Q-002. No behavior change.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Replace ten near-identical `block_on` helpers (one per SDK module)
with a single shared `sdk::bridge::block_on(service: &str, fut)`.
The helper takes a service-prefix string and a future whose error
implements Display, so each module's `KvError`/`DocsError`/etc.
still self-formats.
Migrated:
- kv, docs, pubsub, users, dead_letters, secrets, files, email
- queue.rs has two helpers; the inline-shaped enqueue path and the
block_on_u64 (u64→i64) wrapper are left in place — the latter
could use the shared helper but the local form is one less call
site per finding overlap. Will revisit on a later pass if needed.
- http.rs is intentionally NOT migrated: it has per-variant error
mapping via `map_http_err` that the generic helper can't express.
Net: -218 / +97 lines across the 9 migrated files. Single source of
truth for the runtime-handle lookup and error wrapping.
AUDIT.md anchor: F-Q-002.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Durable pub/sub through the universal outbox — the sixth trigger kind.
- `pubsub::publish_durable(topic, message)` Rhai SDK (no handle; topics
ARE the grouping unit). Message JSON-encoded; Blobs base64 at any
depth.
- `PubsubService` trait in picloud-shared with the topic matcher +
validator (exact / `<prefix>.*` / `*`; mid-pattern wildcards
rejected). `PostgresPubsubRepo` + `PubsubServiceImpl` in manager-core.
- Publish-time fan-out: one outbox row per matching enabled pubsub
trigger, all in ONE transaction (no half-fan-out on crash). No
matching trigger → publish succeeds silently, zero rows.
- `pubsub:*` trigger kind via Layout-E (0020: widen both CHECKs +
pubsub_trigger_details + partial index), TriggerEvent::Pubsub +
ctx.event.pubsub, dispatcher arm, admin endpoint POST /triggers/pubsub
(validates topic pattern + reuses validate_trigger_target).
- AppPubsubPublish capability → script:write (seven-scope held).
- Dashboard Pub/Sub trigger form on the Triggers tab + list rendering.
publish_ephemeral stays deferred to v1.2. ~18 new tests (service
in-memory incl. transactional-rollback, shared matcher, bridge
encoding). No DB required for the suite.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
