Session-scoped autouse fixture in tests/ttp/conftest.py sets
DECNET_DEVELOPER_TRACING=true and forces decnet.telemetry._ENABLED
so the no-op tracer doesn't silently swallow emitted spans. The
span_exporter fixture also monkeypatches decnet.telemetry.get_tracer
so production code under test lands spans in the in-memory
exporter. Tracing tests skip when DECNET_OTEL_ENDPOINT (default
localhost:4317) isn't reachable so the dev loop stays green
without lying about coverage.
In-memory span exporter fixture wired to a per-test TracerProvider
(OTEL global is locked once set, so each test gets its own).
ttp.eval / ttp.lifter.{name} / ttp.rule.fire / ttp.rule.state.change
hierarchy + no-PII canary battery xfail-gated behind E.3.5–E.3.13.
Hypothesis property: N rule_ids × M technique_ids on one event yield
N×M distinct tag UUIDs. Worked example pinned: one rule emitting
(T1110, None) and (T1078, None) → two distinct UUIDs. Engine-level
fan-out + replay xfail-gated behind E.3.7.
Third and fourth TTP-tagging contract commits, plus a scoped subset
of the E.2.4 conformance tests covering the contract surface shipped
here (full hypothesis-fuzz suite still lands with E.2.4).
E.1.3 — decnet/ttp/base.py
- TaggerEvent NamedTuple: source_kind, source_id, attacker_uuid,
identity_uuid, session_id, decky_id, opaque payload.
- Tagger(ABC) with abstract async tag(); class-level name and
HANDLES: frozenset[str] (default empty so a misconfigured subclass
is loudly idle, not loudly noisy).
- TolerantTagger(Tagger): concrete tag() wraps abstract _tag_impl()
in try/except Exception (deliberately not BaseException — so
KeyboardInterrupt / SystemExit / asyncio.CancelledError propagate
and the worker can shut down cleanly). Swallowed exceptions log
at WARNING with exc_info, never ERROR — absence is the steady
state, not a bug. Subclasses override _tag_impl, never tag — the
tolerance contract is enforced in the base class, not on trust.
- KNOWN_SOURCE_KINDS: Final[frozenset[str]] enumerating every
source_kind a producer is allowed to emit. Closed-by-enumeration
at the runtime layer; the composite tagger keys its WARNING/INFO
bridge off this constant to surface the silent-drop trap from
the design doc (lines 160–195).
E.1.4 — decnet/ttp/factory.py
- get_tagger() reads DECNET_TTP_TAGGER_TYPE (default 'composite');
unknown values raise ValueError with the known-list. Mirrors
decnet.intel.factory and decnet.clustering.factory.
- _KNOWN = ('composite',). Per-lifter classes (E.1.6) are children
of the composite, not standalone tagger types.
- CompositeTagger(Tagger): pre-computes a dict[str, list[Tagger]]
dispatch index from each lifter's HANDLES; fans events out
concurrently with asyncio.gather and concatenates results.
Empty lifters=[] is the legal contract-phase state — E.1.6
wires the real lifters in.
- Unhandled-event observability: source_kind in KNOWN_SOURCE_KINDS
but no lifter claims it -> WARNING once per kind per process
(missed E.1.6 update). Unknown kind -> INFO once per kind per
process (future-feature telemetry, by design). Per-process dedup
via plain set; E.1.6 may swap in a proper rate-limiter once
production traffic shapes are known.
Tests — tests/ttp/test_base.py, tests/ttp/test_factory.py
- Tagger / TolerantTagger abstractness, missing-tag-impl rejection,
WARNING-not-ERROR log level, propagation of KeyboardInterrupt /
SystemExit / asyncio.CancelledError.
- Factory env-var routing, unknown-name ValueError, dispatch-index
correctness, only-claiming-lifter invocation, WARNING-once for
known-but-unclaimed kinds, INFO-once for unknown kinds, result
concatenation across lifters.
Mypy clean under .311/bin/mypy --ignore-missing-imports.
