96 lines
3.4 KiB
Python
96 lines
3.4 KiB
Python
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"""Persistence operations for NASA API response caching."""
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from datetime import datetime, timedelta
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from typing import Any, Dict, Optional
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from sqlalchemy import and_, select
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from sqlalchemy.dialects.postgresql import insert
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from sqlalchemy.ext.asyncio import AsyncSession
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from app.database import AsyncSessionLocal
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from app.models.db import NasaCache
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class NasaCacheService:
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"""Read and write cached NASA API responses."""
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@staticmethod
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async def get_cached_response(
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body_id: str,
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start_time: Optional[datetime],
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end_time: Optional[datetime],
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step: str,
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session: Optional[AsyncSession] = None,
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) -> Optional[Dict[str, Any]]:
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async def query(active_session: AsyncSession) -> Optional[Dict[str, Any]]:
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start_naive = start_time.replace(tzinfo=None) if start_time else None
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end_naive = end_time.replace(tzinfo=None) if end_time else None
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result = await active_session.execute(
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select(NasaCache).where(
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and_(
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NasaCache.body_id == body_id,
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NasaCache.start_time == start_naive,
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NasaCache.end_time == end_naive,
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NasaCache.step == step,
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NasaCache.expires_at > datetime.utcnow(),
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)
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)
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)
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cache = result.scalar_one_or_none()
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return cache.data if cache else None
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if session is not None:
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return await query(session)
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async with AsyncSessionLocal() as active_session:
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return await query(active_session)
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@staticmethod
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async def save_response(
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body_id: str,
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start_time: Optional[datetime],
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end_time: Optional[datetime],
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step: str,
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response_data: Dict[str, Any],
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ttl_days: int = 7,
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session: Optional[AsyncSession] = None,
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) -> NasaCache:
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async def save(active_session: AsyncSession) -> NasaCache:
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start_naive = start_time.replace(tzinfo=None) if start_time else None
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end_naive = end_time.replace(tzinfo=None) if end_time else None
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now = datetime.utcnow()
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start_key = start_time.isoformat() if start_time else "null"
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end_key = end_time.isoformat() if end_time else "null"
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cache_key = f"{body_id}:{start_key}:{end_key}:{step}"
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statement = insert(NasaCache).values(
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cache_key=cache_key,
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body_id=body_id,
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start_time=start_naive,
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end_time=end_naive,
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step=step,
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data=response_data,
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expires_at=now + timedelta(days=ttl_days),
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)
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statement = statement.on_conflict_do_update(
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index_elements=["cache_key"],
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set_={
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"data": response_data,
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"created_at": now,
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"expires_at": now + timedelta(days=ttl_days),
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},
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).returning(NasaCache)
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result = await active_session.execute(statement)
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cache = result.scalar_one()
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await active_session.commit()
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await active_session.refresh(cache)
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return cache
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if session is not None:
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return await save(session)
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async with AsyncSessionLocal() as active_session:
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return await save(active_session)
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nasa_cache_service = NasaCacheService()
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