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68 lines
2.5 KiB
Python
68 lines
2.5 KiB
Python
"""Virtual short artifact handles (``A1``, ``A2``, ...) the model can type to reference an artifact.
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A ref is NOT a stored column: ``A{n}`` is the artifact's STABLE per-parent ``ref_seq``, assigned at
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creation and kept in the artifact's ``metadata``, so deleting an earlier artifact no longer
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re-points a later ref the model already holds. Artifacts created before ``ref_seq`` existed have
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none, so resolution falls back to the legacy positional (n-th by created_at) lookup. Refs resolve
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only inside the caller's parent (``conversation_id`` or ``workflow_run_id``), never cross-tenant;
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resolution still goes through the parent-scoped authz gate.
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"""
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from __future__ import annotations
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import re
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from typing import Any, Optional
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from application.storage.db.base_repository import looks_like_uuid
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_REF_RE = re.compile(r"^[Aa](\d+)$")
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def make_ref(position: int) -> str:
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"""Build the short ref string for a 1-based position (``1`` -> ``"A1"``)."""
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return f"A{position}"
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def parse_ref(value: Any) -> Optional[int]:
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"""Parse a short ref like ``A1``/``a2`` into its 1-based position, or None when it is not a ref."""
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if not isinstance(value, str):
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return None
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match = _REF_RE.match(value.strip())
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if match is None:
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return None
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position = int(match.group(1))
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return position if position >= 1 else None
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def resolve_artifact_id(
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repo: Any,
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raw: Any,
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*,
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conversation_id: Optional[str] = None,
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workflow_run_id: Optional[str] = None,
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) -> Optional[str]:
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"""Resolve a short ref or a uuid to an artifact id, scoped to the caller's parent; None otherwise."""
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position = parse_ref(raw)
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if position is not None:
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# A ref is the artifact's stable per-parent ``ref_seq``: resolve by it first so a
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# deletion of an earlier artifact never re-points this ref. Legacy rows (created
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# before ref_seq) and repos without the newer method fall back to the positional
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# (n-th by created_at) lookup.
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by_seq = getattr(repo, "resolve_id_by_ref_seq", None)
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if callable(by_seq):
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resolved = by_seq(
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position,
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conversation_id=conversation_id,
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workflow_run_id=workflow_run_id,
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)
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if resolved is not None:
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return resolved
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return repo.artifact_id_at_position(
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position,
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conversation_id=conversation_id,
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workflow_run_id=workflow_run_id,
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)
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if looks_like_uuid(raw):
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return str(raw).strip()
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return None
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