omnigraph/crates/omnigraph-server
Ragnor Comerford ecf01ef3fe
mr-668: OpenAPI multi-mode cluster filter (PR 4b/10)
PR 4b of the MR-668 multi-graph server work. In multi mode, the served
`/openapi.json` reports cluster routes (`/graphs/{graph_id}/...`) instead
of the legacy flat protected paths — matching what `build_app` actually
mounts (PR 4a's `Router::nest`). Single mode is unchanged.

Implementation:
- New `server_openapi` branch: when `state.mode()` is `Multi`, call
  `nest_paths_under_cluster_prefix(&mut doc)` after `ApiDoc::openapi()`.
- The rewrite consumes `doc.paths.paths`, then for every path-item:
  - If the path is in `ALWAYS_FLAT_PATHS` (`/healthz` for now), keep
    it flat.
  - Otherwise, prefix every operation_id with `cluster_` and reinsert
    the item at `/graphs/{graph_id}<original_path>`.
- Single mode hits no extra work — the path map is untouched.
- The static `ApiDoc::openapi()` still emits the flat surface, so
  in-process callers (the existing `openapi_json()` helper in tests)
  see the unmodified spec.

Why cluster_ prefix on operation IDs: OpenAPI specs require unique
operation_ids across the document. With both flat (single-mode) and
cluster (multi-mode) surfaces ever co-existing in a generated SDK,
the prefix prevents collision. The current served doc only carries
one surface, so the prefix is forward-compat with potential future
dual-surface generation.

Tests: 6 new in `tests/openapi.rs`, all via the `/openapi.json` route
(not the static `ApiDoc::openapi()` helper):
- `multi_mode_openapi_lists_cluster_paths` — every protected path
  appears as a cluster variant.
- `multi_mode_openapi_drops_flat_protected_paths` — flat protected
  paths are absent.
- `multi_mode_openapi_keeps_healthz_flat` — `/healthz` survives.
- `multi_mode_openapi_prefixes_operation_ids_with_cluster` — every
  cluster operation_id starts with `cluster_`.
- `multi_mode_operation_ids_are_unique` — no operation_id collisions.
- `single_mode_openapi_unchanged_by_cluster_filter` — single mode
  still emits the legacy flat surface (regression).

New test helper `app_for_multi_mode(graph_ids)` exercises the new
`AppState::new_multi` constructor from PR 4a — first user of multi-mode
construction outside of unit tests.

Result: 66 openapi tests + 57 server integration tests + 74 lib tests
= 197 green. No regression in the existing OpenAPI drift check
(`openapi_spec_is_up_to_date` still validates the static flat surface
matches the committed openapi.json).

LOC: +67 in lib.rs (rewrite logic), +219 in tests/openapi.rs (test
suite + helper).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-25 19:59:02 +02:00
..
examples Rename repo terminology to graph (#118) 2026-05-24 16:46:00 +01:00
src mr-668: OpenAPI multi-mode cluster filter (PR 4b/10) 2026-05-25 19:59:02 +02:00
tests mr-668: OpenAPI multi-mode cluster filter (PR 4b/10) 2026-05-25 19:59:02 +02:00
Cargo.toml mr-668: add GraphHandle + GraphRegistry data structure (PR 3/10) 2026-05-25 19:30:49 +02:00