# Source code for scrapy.extensions.spiderstate

    from __future__ import annotations

    import pickle  # nosec
    from pathlib import Path
    from typing import TYPE_CHECKING

    from scrapy import Spider, signals
    from scrapy.exceptions import NotConfigured
    from scrapy.utils.job import job_dir

    if TYPE_CHECKING:
        # typing.Self requires Python 3.11
        from typing_extensions import Self

        from scrapy.crawler import Crawler

    class SpiderState:
        """Store and load spider state during a scraping job"""

        def __init__(self, jobdir: str | None = None):
            self.jobdir: str | None = jobdir

        @classmethod
        def from_crawler(cls, crawler: Crawler) -> Self:
            jobdir = job_dir(crawler.settings)
            if not jobdir:
                raise NotConfigured

            obj = cls(jobdir)
            crawler.signals.connect(obj.spider_closed, signal=signals.spider_closed)
            crawler.signals.connect(obj.spider_opened, signal=signals.spider_opened)
            return obj

        def spider_closed(self, spider: Spider) -> None:
            if self.jobdir:
                with Path(self.statefn).open("wb") as f:
                    assert hasattr(spider, "state")  # set in spider_opened
                    pickle.dump(spider.state, f, protocol=4)

        def spider_opened(self, spider: Spider) -> None:
            if self.jobdir and Path(self.statefn).exists():
                with Path(self.statefn).open("rb") as f:
                    spider.state = pickle.load(f)  # type: ignore[attr-defined]  # nosec
            else:
                spider.state = {}  # type: ignore[attr-defined]

        @property
        def statefn(self) -> str:
            assert self.jobdir
            return str(Path(self.jobdir, "spider.state"))