giles d36fe4ee97 fed-sx-m2: Step 5d — inbox handler wires the ingestion chain ...

POST /actors/<id>/inbox is now special-cased in route/2 (next to
POST /activity) so the body + Cfg reach the new handle_inbox_post/3
handler.

Wire format: body = term_codec:encode(SignedActivity); the receiver
decodes into the activity proplist and runs the chain.

handle_inbox_post/3 orchestration:
  1. kernel_has_actor(field(kernel, Cfg), TargetId)  -> 404 if missing
  2. decode_activity(Body)                           -> 422 on bad shape
  3. envelope:get_field(actor, Activity)             -> 422 if no peer id
  4. resolve_peer_as(PeerId, Cfg)                    -> 401 if unknown
  5. nx_kernel:inbox_state_for(TargetAtom)           -> 404 belt-and-braces
  6. pipeline:validate_inbound(Activity, PeerAS, InboxLog)
       ok                     -> nx_kernel:append_inbox + 202
       {error, bad_signature} -> 401
       {error, no_signature}  -> 401
       {error, _}             -> 422

resolve_peer_as/2 supports three Cfg paths in priority order:
  {peer_as,        [{PeerId, AS}, ...]}   pure-fn pre-populated map
  {peer_actors,    AtomName}              peer_actors gen_server cache
  {peer_fetch_fn,  fun/1}                 fallback on srv cache miss
Empty Cfg returns {error, no_peer_resolver} -> 401.

v1 actor_post/1 4a stub deleted; M1 actor_inbox_post_response/0
kept for response composition.

Projection broadcast on inbox success intentionally deferred to a
follow-up sub-deliverable.

inbox.sh 11/11 (acceptance suite for the basic chain):
  - happy path -> 202
  - inbox tip advances; outbox tip unchanged (per-actor bucket
    independence carried through from Step 5a)
  - empty / garbage body -> 422
  - unknown peer -> 401
  - bad peer-AS keys -> 401
  - replay (same activity twice) -> 422 on second
  - unknown target actor -> 404
  - two distinct activities -> tip = 2

inbox_peer_resolution.sh 6/6 (Cfg resolution variants):
  - peer_actors gen_server hit -> 202
  - FetchFn fallback -> 202
  - FetchFn error -> 401
  - FetchFn caches into peer_actors (peers_srv shows [bob] after)
  - No resolver -> 401

Tests split into two files because each epoch's kernel start_link
+ outbox construct + term_codec encode is expensive and a single
suite hits the wall-clock budget.

http_server.erl is now 1181 lines. erlang-load-module on this port
scales superlinearly with function count, so eight http_*.sh tests'
internal sx_server timeout bumped 60s -> 360s (http_route,
http_actors, http_accept, http_capabilities, http_capabilities_format,
http_content_type, http_artifacts, http_projections).

Conformance 761/761.

2026-06-06 19:19:02 +00:00

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