Implements the DB-backed rule store body left empty at contract phase:
load_compiled reads from ttp_rule + ttp_rule_state; get_state /
set_state hit ttp_rule_state with the same expires_at auto-revert and
bus-event semantics as the FS backend; subscribe_changes returns a
per-subscriber queue. State persists across process restarts — the
swarm property the FS backend deliberately doesn't have.
Also lands two swarm-mode helpers:
- sync_from_filesystem(fs_store) — master-side, subscribes to a
FilesystemRuleStore and projects each RuleChange onto a ttp_rule
upsert/delete.
- tail_db(poll_interval) — worker-side, watermark poll over
ttp_rule.updated_at; emits RuleChange("definition", ...) for each
row that moved.
Why: swarm mode needs rule definitions and operator state to
propagate across hosts. The filesystem backend (E.3.5) was the
single-host-dev variant; this one survives restart and serves N
workers from a shared DB.
Notes:
- DatabaseRuleStore() with no args lazy-inits an in-memory SQLite
repo so the conformance fixture works without test plumbing. In
production the worker bootstrap (E.3.14) passes an explicit repo.
- The conftest.py rule_store fixture became async (pytest_asyncio),
per-backend creates/initializes a SQLite repo for the DB run.
- Adds a `seed_rule(store, rule_id, yaml)` helper to bridge backend
semantics: drop a YAML file (FS) vs insert a ttp_rule row (DB).
Used by the parametrized load_compiled conformance test.
- Late-bound _tracer() in both backends (was module-level get_tracer
binding) so test_tracing's monkeypatch of decnet.telemetry.get_tracer
actually affects span output.
xfails flipped: tests/ttp/store/test_database.py set_state-writes-to-
ttp_rule_state + filesystem-to-DB sync; tests/ttp/store/test_conformance.py
DB-side load_compiled / set_state isolation / round-trip / per-rule
fan-out / expired-state revert / set_state failure / get_state default
(was xfail-only-on-DB); tests/ttp/test_tracing.py set_state span
hierarchy.
Tests: 208 passed, 25 xfailed (gated on E.3.7 + lifters).
mypy: clean on all touched files.
Adds decnet/ttp/store/ subpackage:
- base.py: RuleState frozen dataclass, RuleChange NamedTuple, RuleStore ABC
- factory.py: get_rule_store() reading DECNET_TTP_RULE_STORE_TYPE
- impl/filesystem.py: FilesystemRuleStore with sys.platform=='linux'
fail-fast guard, allowlist filename regex, raw inotify mask bits
(lib import deferred to E.3 so contract phase compiles without the
asyncinotify dep installed)
- impl/database.py: DatabaseRuleStore stub (no platform guard)
TTPRule + TTPRuleState SQLModels were already shipped at E.1.1; this
commit closes the type-only TYPE_CHECKING forward-ref in
rule_engine.py via real runtime imports through the new package.
