# Source code for scrapy.extensions.logcount

    from __future__ import annotations

    import logging
    from typing import TYPE_CHECKING

    from scrapy import Spider, signals
    from scrapy.utils.log import LogCounterHandler

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

        from scrapy.crawler import Crawler

    logger = logging.getLogger(__name__)

    class LogCount:
        """Install a log handler that counts log messages by level.

        The handler installed is :class:`scrapy.utils.log.LogCounterHandler`.
        The counts are stored in stats as ``log_count/<level>``.

        .. versionadded:: 2.14
        """

        def __init__(self, crawler: Crawler):
            self.crawler: Crawler = crawler
            self.handler: LogCounterHandler | None = None

        @classmethod
        def from_crawler(cls, crawler: Crawler) -> Self:
            o = cls(crawler)
            crawler.signals.connect(o.spider_opened, signal=signals.spider_opened)
            crawler.signals.connect(o.spider_closed, signal=signals.spider_closed)
            return o

        def spider_opened(self, spider: Spider) -> None:
            self.handler = LogCounterHandler(
                self.crawler, level=self.crawler.settings.get("LOG_LEVEL")
            )
            logging.root.addHandler(self.handler)

        def spider_closed(self, spider: Spider, reason: str) -> None:
            if self.handler:
                logging.root.removeHandler(self.handler)
                self.handler = None