184 lines
6.7 KiB
Python
184 lines
6.7 KiB
Python
import json
|
||
import logging
|
||
from contextlib import contextmanager
|
||
from datetime import datetime, timezone
|
||
from typing import Iterator
|
||
|
||
from sqlalchemy import create_engine, or_, select
|
||
from sqlalchemy.orm import Session, sessionmaker
|
||
|
||
from ..core.config import Settings
|
||
from .models import Base, Car, Image, SyncRun
|
||
from .schemas import CarRecord
|
||
|
||
logger = logging.getLogger("iaai_scraper.db")
|
||
|
||
|
||
CAR_DB_FIELDS = {
|
||
"parser_id",
|
||
"brand",
|
||
"model",
|
||
"year",
|
||
"price",
|
||
"currency",
|
||
"mileage",
|
||
"country",
|
||
"is_sold",
|
||
"color",
|
||
"drive",
|
||
"gearbox",
|
||
"steering_wheel",
|
||
"body_type",
|
||
"engine_volume",
|
||
"selling_type",
|
||
"one_owner",
|
||
"new_car",
|
||
"is_hidden",
|
||
"origin",
|
||
"origin_url",
|
||
"origin_id",
|
||
"is_damaged",
|
||
"evaluation",
|
||
"non_smoking",
|
||
"rental",
|
||
"repair_history",
|
||
"slug",
|
||
"last_seen_at",
|
||
"content_hash",
|
||
"raw_attributes",
|
||
}
|
||
|
||
|
||
class PersistenceService:
|
||
|
||
def __init__(self, settings: Settings) -> None:
|
||
# Инициализация engine и фабрики сессий.
|
||
self.settings = settings
|
||
self.engine = create_engine(settings.database.url, echo=settings.database.echo, future=True)
|
||
self.session_factory = sessionmaker(bind=self.engine, expire_on_commit=False, future=True)
|
||
|
||
def create_tables(self) -> None:
|
||
Base.metadata.create_all(self.engine)
|
||
|
||
@contextmanager
|
||
def session_scope(self) -> Iterator[Session]:
|
||
# Единая точка commit/rollback для операций записи.
|
||
session = self.session_factory()
|
||
try:
|
||
yield session
|
||
session.commit()
|
||
except Exception:
|
||
session.rollback()
|
||
raise
|
||
finally:
|
||
session.close()
|
||
|
||
def start_sync_run(self, lane: str) -> int:
|
||
# Создаём запись о запуске синхронизации.
|
||
with self.session_scope() as session:
|
||
# Если предыдущий процесс умер, оставив run в `running`,
|
||
# помечаем его как failed перед новым запуском.
|
||
now = datetime.now(timezone.utc)
|
||
stale_runs = session.execute(select(SyncRun).where(SyncRun.status == "running")).scalars().all()
|
||
for stale in stale_runs:
|
||
stale.status = "failed"
|
||
stale.finished_at = now
|
||
if not stale.error_summary:
|
||
stale.error_summary = "Recovered stale running sync run before starting a new run"
|
||
|
||
run = SyncRun(status="running", lane=lane, ids_fetched=0, cars_upserted=0, cars_failed=0, images_upserted=0)
|
||
session.add(run)
|
||
session.flush()
|
||
return int(run.id)
|
||
|
||
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:
|
||
# Завершаем sync_run и фиксируем итоговую статистику.
|
||
with self.session_scope() as session:
|
||
run = session.get(SyncRun, run_id)
|
||
if run is None:
|
||
return
|
||
run.finished_at = datetime.now(timezone.utc)
|
||
run.status = status
|
||
run.ids_fetched = ids_fetched
|
||
run.cars_upserted = cars_upserted
|
||
run.cars_failed = cars_failed
|
||
run.images_upserted = images_upserted
|
||
run.error_summary = error_summary
|
||
|
||
def get_existing_origin_urls(self, origin_urls: list[str]) -> set[str]:
|
||
# Возвращает уже существующие в БД origin_url для фильтрации only-new запусков.
|
||
if not origin_urls:
|
||
return set()
|
||
with self.session_scope() as session:
|
||
rows = session.execute(select(Car.origin_url).where(Car.origin_url.in_(origin_urls))).all()
|
||
return {str(row[0]) for row in rows if row and row[0]}
|
||
|
||
def get_existing_origin_ids(self, origin_ids: list[str]) -> set[str]:
|
||
# Возвращает уже существующие в БД origin_id для фильтрации только новых авто.
|
||
if not origin_ids:
|
||
return set()
|
||
with self.session_scope() as session:
|
||
rows = session.execute(select(Car.origin_id).where(Car.origin_id.in_(origin_ids))).all()
|
||
return {str(row[0]) for row in rows if row and row[0]}
|
||
|
||
@staticmethod
|
||
def _add_images(session: Session, car_id: int, images: list[dict[str, object]]) -> None:
|
||
for image_payload in images:
|
||
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))
|
||
|
||
@staticmethod
|
||
def _car_payload(record: CarRecord) -> dict[str, object]:
|
||
payload = record.model_dump(mode="python")
|
||
result = {key: value for key, value in payload.items() if key in CAR_DB_FIELDS}
|
||
|
||
if "raw_attributes" in result and isinstance(result["raw_attributes"], dict):
|
||
result["raw_attributes"] = json.dumps(result["raw_attributes"], ensure_ascii=False, default=str)
|
||
return result
|
||
|
||
def upsert_car(self, record: CarRecord):
|
||
"""Insert/update/skip по content_hash."""
|
||
# В БД отправляем только поля, реально существующие в финальной схеме cars.
|
||
payload = self._car_payload(record)
|
||
images = [image.model_dump(mode="python") for image in record.images]
|
||
content_hash = str(payload.get("content_hash") or "")
|
||
with self.session_scope() as session:
|
||
# Сначала пытаемся найти по origin_id, а если ранее origin_id был неполный,
|
||
# подхватываем существующую запись по origin_url, чтобы не плодить дубли.
|
||
car = session.execute(
|
||
select(Car).where(or_(Car.origin_id == record.origin_id, Car.origin_url == record.origin_url))
|
||
).scalar_one_or_none()
|
||
action = "inserted"
|
||
if car is None:
|
||
car = Car(**payload)
|
||
session.add(car)
|
||
session.flush()
|
||
else:
|
||
# Если контент не менялся, просто обновляем last_seen_at.
|
||
if content_hash and car.content_hash == content_hash:
|
||
car.last_seen_at = record.last_seen_at
|
||
session.flush()
|
||
return {"car_id": int(car.id), "images_upserted": 0, "action": "skipped"}
|
||
action = "updated"
|
||
# Обновляем поля машины и затем безопасно пересобираем картинки.
|
||
for key, value in payload.items():
|
||
setattr(car, key, value)
|
||
car.last_seen_at = record.last_seen_at
|
||
session.flush()
|
||
# замена картинок в savepoint
|
||
nested = session.begin_nested()
|
||
try:
|
||
for image in list(car.images):
|
||
session.delete(image)
|
||
session.flush()
|
||
self._add_images(session, int(car.id), images)
|
||
session.flush()
|
||
nested.commit()
|
||
except Exception:
|
||
nested.rollback()
|
||
logger.warning("Image replacement failed for car %s, keeping old images", record.origin_id)
|
||
images = []
|
||
return {"car_id": int(car.id), "images_upserted": len(images), "action": action}
|
||
self._add_images(session, int(car.id), images)
|
||
session.flush()
|
||
return {"car_id": int(car.id), "images_upserted": len(images), "action": action}
|