mirror of
https://github.com/azaion/gps-denied-onboard.git
synced 2026-06-22 14:41:15 +00:00
Oleksandr Bezdieniezhnykh
5dfd9a577e
Closes cumulative review 46-48 F1 (Medium) + F3 (Low). Adds iso_ts_from_clock(clock) alongside iso_ts_now() in the Layer-1 helper; migrates four duplicate definitions in c2_vpr (net_vlad, ultra_vpr, _faiss_bridge) and c12_operator_orchestrator (operator_reloc_service). Output format flipped +00:00 -> Z to align with iso_ts_now() and the canonical FDR _TS fixture (FDR schema test passes unmodified). 18 helper AC tests + 186 sibling tests pass; ruff clean. Co-authored-by: Cursor <cursoragent@cursor.com>
57 lines
2.3 KiB
Python
57 lines
2.3 KiB
Python
"""UTC ISO-8601 timestamp helpers (E-CC-HELPERS / AZ-264 / AZ-508 + AZ-526).
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Single Layer-1 source for the FDR record ``ts`` envelope strings across
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every component. Two variants:
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- :func:`iso_ts_now` — uses :func:`datetime.now` (wall clock); 6-digit
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microsecond precision; for components that don't have a ``Clock``
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injected (the c6_tile_cache and c7_inference FDR producers).
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- :func:`iso_ts_from_clock` — uses an injected :class:`Clock` Protocol;
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9-digit nanosecond precision; for components that already accept a
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``Clock`` constructor parameter (the c2_vpr strategies, the FAISS
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bridge, the C12 operator-reloc service, and the future C4 / C5 batches).
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Both produce RFC 3339 UTC with a ``Z`` suffix, matching the canonical
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FDR ``ts`` fixture in ``tests/unit/test_az272_fdr_record_schema.py``
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(``_TS = "2026-05-11T00:00:00.000000Z"``). Changing the format would
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alter FDR record bit-shape and is explicitly out of scope.
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Producers that need a Clock-injected payload field (e.g. ``age_seconds``
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derived from an injected wall-clock for testability) MUST NOT route
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through these helpers — they are purely metadata about WHEN the FDR
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record envelope itself was emitted.
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"""
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from __future__ import annotations
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from datetime import datetime, timezone
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from typing import TYPE_CHECKING
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if TYPE_CHECKING:
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from gps_denied_onboard.clock import Clock
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__all__ = ["iso_ts_from_clock", "iso_ts_now"]
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def iso_ts_now() -> str:
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"""Return an RFC 3339 UTC timestamp with microsecond precision and a ``Z`` suffix.
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Format: ``YYYY-MM-DDTHH:MM:SS.ffffffZ`` (fixed-width, lexicographically
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monotonic under a non-decreasing wall clock).
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"""
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return datetime.now(timezone.utc).strftime("%Y-%m-%dT%H:%M:%S.%fZ")
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def iso_ts_from_clock(clock: Clock) -> str:
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"""Return an RFC 3339 UTC timestamp built from ``clock.time_ns()``.
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Format: ``YYYY-MM-DDTHH:MM:SS.fffffffffZ`` (9-digit nanosecond
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precision, ``Z`` suffix). Use when the timestamp must follow an
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injectable :class:`~gps_denied_onboard.clock.Clock` (replay tests,
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deterministic fixtures); use :func:`iso_ts_now` otherwise.
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"""
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ns = int(clock.time_ns())
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seconds, fraction_ns = divmod(ns, 1_000_000_000)
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dt = datetime.fromtimestamp(seconds, tz=timezone.utc)
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return f"{dt.strftime('%Y-%m-%dT%H:%M:%S')}.{fraction_ns:09d}Z"
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