155 lines
5.1 KiB
Python
155 lines
5.1 KiB
Python
import json
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import logging
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from contextlib import contextmanager
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from datetime import datetime, timezone
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from typing import Iterator
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from sqlalchemy import create_engine, select
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from sqlalchemy.orm import Session, sessionmaker
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from ..core.config import Settings
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from .models import Base, Car, Image, SyncRun
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from .schemas import CarRecord
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logger = logging.getLogger("iaai_scraper.db")
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CAR_DB_FIELDS = {
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"parser_id",
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"brand",
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"model",
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"year",
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"price",
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"currency",
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"mileage",
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"country",
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"is_sold",
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"color",
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"drive",
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"gearbox",
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"steering_wheel",
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"body_type",
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"engine_volume",
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"selling_type",
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"one_owner",
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"new_car",
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"is_hidden",
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"origin",
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"origin_url",
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"origin_id",
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"is_damaged",
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"evaluation",
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"non_smoking",
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"rental",
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"repair_history",
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"slug",
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"last_seen_at",
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"content_hash",
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"raw_attributes",
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}
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class PersistenceService:
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def __init__(self, settings: Settings) -> None:
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# Инициализация engine и фабрики сессий.
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self.settings = settings
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self.engine = create_engine(settings.database.url, echo=settings.database.echo, future=True)
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self.session_factory = sessionmaker(bind=self.engine, expire_on_commit=False, future=True)
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def create_tables(self) -> None:
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Base.metadata.create_all(self.engine)
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@contextmanager
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def session_scope(self) -> Iterator[Session]:
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# Единая точка commit/rollback для операций записи.
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session = self.session_factory()
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try:
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yield session
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session.commit()
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except Exception:
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session.rollback()
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raise
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finally:
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session.close()
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def start_sync_run(self, lane: str) -> int:
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# Создаём запись о запуске синхронизации.
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with self.session_scope() as session:
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run = SyncRun(status="running", lane=lane, ids_fetched=0, cars_upserted=0, cars_failed=0, images_upserted=0)
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session.add(run)
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session.flush()
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return int(run.id)
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def finish_sync_run(self, run_id: int, *, status: str, ids_fetched: int, cars_upserted: int, cars_failed: int, images_upserted: int, error_summary: str | None = None) -> None:
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# Завершаем sync_run и фиксируем итоговую статистику.
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with self.session_scope() as session:
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run = session.get(SyncRun, run_id)
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if run is None:
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return
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run.finished_at = datetime.now(timezone.utc)
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run.status = status
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run.ids_fetched = ids_fetched
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run.cars_upserted = cars_upserted
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run.cars_failed = cars_failed
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run.images_upserted = images_upserted
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run.error_summary = error_summary
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@staticmethod
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def _add_images(session: Session, car_id: int, images: list[dict[str, object]]) -> None:
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for image_payload in images:
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session.add(Image(fullres_image=str(image_payload["fullres_image"]), preview_image=str(image_payload["preview_image"]), order_index=int(image_payload.get("order_index", 0)), car_id=car_id))
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@staticmethod
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def _car_payload(record: CarRecord) -> dict[str, object]:
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payload = record.model_dump(mode="python")
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result = {key: value for key, value in payload.items() if key in CAR_DB_FIELDS}
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# Serialize raw_attributes dict to JSON string for Text column.
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if "raw_attributes" in result and isinstance(result["raw_attributes"], dict):
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result["raw_attributes"] = json.dumps(result["raw_attributes"], ensure_ascii=False, default=str)
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return result
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def upsert_car(self, record: CarRecord):
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"""Insert/update/skip по content_hash."""
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# В БД отправляем только поля, реально существующие в финальной схеме cars.
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payload = self._car_payload(record)
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images = [image.model_dump(mode="python") for image in record.images]
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content_hash = str(payload.get("content_hash") or "")
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with self.session_scope() as session:
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# поиск по origin_id
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car = session.execute(select(Car).where(Car.origin_id == record.origin_id)).scalar_one_or_none()
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action = "inserted"
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if car is None:
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car = Car(**payload)
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session.add(car)
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session.flush()
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else:
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# Если контент не менялся, просто обновляем last_seen_at.
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if content_hash and car.content_hash == content_hash:
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car.last_seen_at = record.last_seen_at
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session.flush()
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return {"car_id": int(car.id), "images_upserted": 0, "action": "skipped"}
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action = "updated"
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# Обновляем поля машины и затем безопасно пересобираем картинки.
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for key, value in payload.items():
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setattr(car, key, value)
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car.last_seen_at = record.last_seen_at
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session.flush()
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# замена картинок в savepoint
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nested = session.begin_nested()
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try:
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for image in list(car.images):
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session.delete(image)
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session.flush()
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self._add_images(session, int(car.id), images)
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session.flush()
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nested.commit()
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except Exception:
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nested.rollback()
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logger.warning("Image replacement failed for car %s, keeping old images", record.origin_id)
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images = []
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return {"car_id": int(car.id), "images_upserted": len(images), "action": action}
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self._add_images(session, int(car.id), images)
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session.flush()
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return {"car_id": int(car.id), "images_upserted": len(images), "action": action}
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