* test(ecstore): extract shared MockWarmBackend into a test-util feature (backlog#1148 ilm-6)
The tier/lifecycle integration tests carried two byte-for-byte copies of an
in-memory WarmBackend mock — one in crates/scanner/tests and one in
rustfs/src/app — plus duplicated register_mock_tier and polling helpers. Both
implemented the same ecstore WarmBackend trait.
Consolidate them into ecstore behind a new `test-util` feature, exposed via the
`rustfs_ecstore::api::tier::test_util` facade:
- MockWarmBackend: in-memory WarmBackend with an operation log (for ordering
assertions such as "local delete precedes remote remove") and fault injection
(FaultConfig): unreachable, HTTP 5xx, credential rejection, injected latency,
plus external_remove to simulate an out-of-band remote deletion.
- register_mock_tier / register_mock_tier_backend: register the mock into any
TierConfigMgr handle (the global manager used by scanner tests or a
per-instance one used by the app tests).
- xl.meta transition assertion helpers: read_transition_meta,
assert_transition_meta_consistent (cross-shard consistency of the
status/tier/remote-key/remote-version-id tuple plus free-version count), and
free_version_count.
- polling helpers: wait_for_remote_absence, wait_for_object_count,
wait_for_free_version_absence.
Both existing copies now consume this single definition; `rg 'struct
MockWarmBackend'` collapses to one. The feature is enabled only from
[dev-dependencies], so it never links into the production binary (resolver 3).
Designed for downstream ilm-8 (restore lifecycle) and ilm-11 (tier fault
injection matrix). Coordinates with #4706 (ilm-2), which adds op-logging to the
scanner mock — that op-logging is now part of this shared surface, so #4706
should rebase onto it.
Refs rustfs/backlog#1148 (ilm-6), rustfs/backlog#1155.
* test(ecstore): fix shared MockWarmBackend usage after main merge
- Access stored objects via MockWarmBackend::contains() instead of the now
private inner objects map (fixes E0609 after the shared test-util refactor).
- Drop dead ReadCloser/ReaderImpl/DiskAPI imports and the unused
transition_api test re-exports the mock extraction left behind.
- Reword the scanner/rustfs test-util dependency comments so they no longer
embed the literal rustfs_ecstore:: path that trips the ECStore
architecture-migration guard.
Adds a serial-lane ILM integration regression test that pins the
local-first ordering contract established by rustfs#3491, where
`expire_transitioned_object` deletes local metadata BEFORE any remote
tier cleanup so a concurrent GET can never observe live local metadata
pointing at an already-removed remote tier version (user-visible
`NoSuchVersion`).
`serial_tests::test_expire_transitioned_object_never_races_concurrent_get`
in `crates/scanner/tests/lifecycle_integration_test.rs`:
- Transitions an object to a mock warm tier, then runs a tight
concurrent GET loop while calling `expire_transitioned_object`; every
GET must return a full, correct body or a clean object/version-not-found
-- never a tier-fetch failure.
- Deterministic ordering assertion (revert-proof): immediately after
expiry the remote tier object is still present and the mock recorded
zero remote `remove` calls, proving remote cleanup is deferred to
free-version recovery. Reverting to remote-first ordering turns this
assertion red.
Supporting changes:
- Re-export `expire_transitioned_object` from `api::bucket::lifecycle`.
- Record remote-tier mutating ops in the scanner test `MockWarmBackend`.
- Update tier-ilm-debugging.md to reference the new regression test.
Runs in the CI ILM Integration (serial) lane (ci.yml
test-ilm-integration-serial), picked up by the existing
binary(lifecycle_integration_test) filter.
Refs: rustfs/backlog#1148 (ilm-2), rustfs/backlog#1155
Zhengchao An