dubizzle/iaai_scraper/worker/tasks.py

# Задачи Celery для синхронизации автомобилей и листинга IAAI.

from concurrent.futures import ThreadPoolExecutor
import logging
from threading import Event, Thread
import time
import uuid

from celery import shared_task
from redis import Redis

from ..core.config import Settings
from ..scraper import IAAIScraper
from ..storage.db import PersistenceService

logger = logging.getLogger("iaai_scraper.worker.tasks")

SYNC_LISTING_LOCK_KEY = "iaai:locks:sync_listing"


def _run_browser_job(func, *args, **kwargs):
    # Браузерный код запускаем в отдельном потоке без активного loop.
    with ThreadPoolExecutor(max_workers=1, thread_name_prefix="iaai-browser") as executor:
        future = executor.submit(func, *args, **kwargs)
        return future.result()


def _sync_listing_lock_ttl_seconds() -> int:
    settings = Settings()
    # Небольшой запас к лимиту времени, чтобы lock снимался после сбоев.
    return max(settings.celery.task_time_limit + 120, 300)


def _get_persistence() -> PersistenceService:
    return PersistenceService(Settings())


def _get_redis() -> Redis:
    settings = Settings()
    return Redis.from_url(settings.redis.url, decode_responses=True)


def _acquire_lock(redis_client: Redis, key: str, owner_token: str, ttl_seconds: int) -> bool:
    try:
        return bool(redis_client.set(key, owner_token, nx=True, ex=ttl_seconds))
    except Exception as exc:
        logger.warning("Failed to acquire lock %s", key, exc_info=True)
        return False


def _refresh_lock_if_owner(redis_client: Redis, key: str, owner_token: str, ttl_seconds: int) -> bool | None:
    try:
        refreshed = redis_client.eval(
            """
            if redis.call('GET', KEYS[1]) == ARGV[1] then
                return redis.call('EXPIRE', KEYS[1], tonumber(ARGV[2]))
            end
            return 0
            """,
            1,
            key,
            owner_token,
            int(ttl_seconds),
        )
        return bool(refreshed)
    except Exception as exc:
        logger.warning("Failed to refresh lock %s", key, exc_info=True)
        return None


def _release_lock_if_owner(redis_client: Redis, key: str, owner_token: str) -> None:
    try:
        redis_client.eval(
            """
            if redis.call('GET', KEYS[1]) == ARGV[1] then
                return redis.call('DEL', KEYS[1])
            end
            return 0
            """,
            1,
            key,
            owner_token,
        )
    except Exception as exc:
        logger.warning("Failed to release lock %s", key, exc_info=True)


def _start_lock_heartbeat(
    redis_client: Redis,
    key: str,
    owner_token: str,
    ttl_seconds: int,
) -> tuple[Event, Thread]:
    stop_event = Event()
    interval_seconds = max(5.0, min(30.0, ttl_seconds / 3))

    def _heartbeat() -> None:
        while not stop_event.wait(interval_seconds):
            refreshed = _refresh_lock_if_owner(redis_client, key, owner_token, ttl_seconds)
            if refreshed is False:
                logger.warning("Lost sync_listing lock ownership for %s", owner_token)
                return

    thread = Thread(target=_heartbeat, name="sync-listing-lock-heartbeat", daemon=True)
    thread.start()
    return stop_event, thread


@shared_task(
    name="iaai_scraper.worker.tasks.sync_vehicle_task",
    bind=True,
    max_retries=2,
    default_retry_delay=30,
    acks_late=True,
)
def sync_vehicle_task(self, vehicle_url: str, lane: str = "iaai"):
    # Скрапинг и upsert одного автомобиля.
    persistence = _get_persistence()
    persistence.create_tables()

    try:
        def _job():
            with IAAIScraper() as scraper:
                return scraper.sync_vehicle(vehicle_url, lane=lane)

        result = _run_browser_job(_job)
        logger.info("sync_vehicle_task completed: %s", vehicle_url)
        return {
            "status": "success",
            "vehicle_url": vehicle_url,
            "db_action": result.get("db_action"),
            "images_upserted": result.get("images_upserted", 0),
        }

    except Exception as exc:
        logger.error("sync_vehicle_task failed: %s — %s", vehicle_url, exc, exc_info=True)
        raise self.retry(exc=exc)


@shared_task(
    name="iaai_scraper.worker.tasks.sync_listing_task",
    bind=True,
    max_retries=1,
    default_retry_delay=120,
    acks_late=True,
)
def sync_listing_task(
    self,
    make: str | None = None,
    model: str | None = None,
    lane: str = "iaai_cars",
    limit: int | None = None,
    only_new: bool | None = None,
):
    # Полный цикл: листинг + sync всех найденных машин.
    persistence = _get_persistence()
    persistence.create_tables()
    task_id = self.request.id or "unknown"
    owner_token = f"{task_id}:{uuid.uuid4().hex}"
    redis_client = _get_redis()

    lock_acquired = False
    lock_ttl = _sync_listing_lock_ttl_seconds()
    heartbeat_stop: Event | None = None
    heartbeat_thread: Thread | None = None

    lock_acquired = _acquire_lock(redis_client, SYNC_LISTING_LOCK_KEY, owner_token, lock_ttl)

    if not lock_acquired:
        logger.info("sync_listing_task skipped: another sync is already running")
        return {
            "status": "skipped",
            "reason": "sync_already_running",
            "task_id": task_id,
        }

    try:
        heartbeat_stop, heartbeat_thread = _start_lock_heartbeat(
            redis_client,
            SYNC_LISTING_LOCK_KEY,
            owner_token,
            lock_ttl,
        )
        self.update_state(state="STARTED", meta={"stage": "sync_listing_started", "task_id": task_id})
        def _job():
            with IAAIScraper() as scraper:
                return scraper.sync_listing(
                    make=make,
                    model=model,
                    lane=lane,
                    limit=limit,
                    only_new=only_new,
                )

        result = _run_browser_job(_job)

        summary = {
            "task_id": task_id,
            "run_id": result.get("run_id"),
            "cars_upserted": result.get("cars_upserted", 0),
            "cars_failed": result.get("cars_failed", 0),
            "images_upserted": result.get("images_upserted", 0),
            "skipped_existing": result.get("skipped_existing", 0),
            "elapsed_seconds": result.get("elapsed_seconds"),
        }
        logger.info(
            "sync_listing_task completed: %d upserted, %d failed",
            summary["cars_upserted"], summary["cars_failed"],
        )
        return {"status": "success", **summary}

    except Exception as exc:
        logger.error("sync_listing_task failed: %s", exc, exc_info=True)
        raise self.retry(exc=exc)
    finally:
        if heartbeat_stop is not None:
            heartbeat_stop.set()
        if heartbeat_thread is not None:
            heartbeat_thread.join(timeout=max(1.0, min(5.0, lock_ttl / 10)))
        if lock_acquired:
            _release_lock_if_owner(redis_client, SYNC_LISTING_LOCK_KEY, owner_token)