inecs
6033967e6a
Ship Keystone auth, multi-service handlers (Yoga→Dalmatian), Compose/Helm packaging, API contract packs, and pytest/Pulumi coverage labs.
47 lines
1.3 KiB
Python
47 lines
1.3 KiB
Python
"""OpenStack-style limit/marker pagination helpers."""
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from __future__ import annotations
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from typing import Any, Callable
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from starlette.requests import Request
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def parse_limit(request: Request, *, default: int = 0, maximum: int = 1000) -> int:
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raw = request.query_params.get("limit")
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if raw is None or raw == "":
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return default
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try:
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value = int(raw)
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except ValueError:
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return default
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if value <= 0:
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return default
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return min(value, maximum)
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def paginate_rows(
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rows: list[Any],
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request: Request,
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*,
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id_attr: Callable[[Any], str],
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default_limit: int = 0,
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) -> tuple[list[Any], list[dict[str, str]]]:
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"""Slice rows by marker/limit. Returns (page, link dicts for next)."""
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marker = request.query_params.get("marker")
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limit = parse_limit(request, default=default_limit)
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start = 0
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if marker:
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for index, row in enumerate(rows):
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if id_attr(row) == marker:
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start = index + 1
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break
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page = rows[start:]
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links: list[dict[str, str]] = []
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if limit > 0 and len(page) > limit:
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page = page[:limit]
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last = page[-1]
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links.append({"rel": "next", "href": f"?marker={id_attr(last)}&limit={limit}"})
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return page, links
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