mirror of
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55 lines
1.6 KiB
Python
55 lines
1.6 KiB
Python
"""Shared utilities for database query modules."""
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import os
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from typing import Iterable
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import sqlalchemy as sa
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from app.assets.database.models import AssetReference
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from app.assets.helpers import escape_sql_like_string
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MAX_BIND_PARAMS = 800
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def calculate_rows_per_statement(cols: int) -> int:
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"""Calculate how many rows can fit in one statement given column count."""
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return max(1, MAX_BIND_PARAMS // max(1, cols))
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def iter_chunks(seq, n: int):
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"""Yield successive n-sized chunks from seq."""
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for i in range(0, len(seq), n):
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yield seq[i : i + n]
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def iter_row_chunks(rows: list[dict], cols_per_row: int) -> Iterable[list[dict]]:
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"""Yield chunks of rows sized to fit within bind param limits."""
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if not rows:
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return
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yield from iter_chunks(rows, calculate_rows_per_statement(cols_per_row))
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def build_visible_owner_clause(owner_id: str) -> sa.sql.ClauseElement:
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"""Build owner visibility predicate for reads.
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Owner-less rows are visible to everyone.
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"""
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owner_id = (owner_id or "").strip()
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if owner_id == "":
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return AssetReference.owner_id == ""
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return AssetReference.owner_id.in_(["", owner_id])
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def build_prefix_like_conditions(
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prefixes: list[str],
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) -> list[sa.sql.ColumnElement]:
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"""Build LIKE conditions for matching file paths under directory prefixes."""
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conds = []
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for p in prefixes:
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base = os.path.abspath(p)
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if not base.endswith(os.sep):
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base += os.sep
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escaped, esc = escape_sql_like_string(base)
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conds.append(AssetReference.file_path.like(escaped + "%", escape=esc))
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return conds
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