mirror of https://github.com/scrapy/scrapy.git
61 lines
2.3 KiB
Python
61 lines
2.3 KiB
Python
"""
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Extension for collecting core stats like items scraped and start/finish times
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"""
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from __future__ import annotations
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from datetime import datetime, timezone
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from time import monotonic
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from typing import TYPE_CHECKING, Any
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from scrapy import Spider, signals
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if TYPE_CHECKING:
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# typing.Self requires Python 3.11
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from typing_extensions import Self
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from scrapy.crawler import Crawler
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from scrapy.statscollectors import StatsCollector
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class CoreStats:
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def __init__(self, stats: StatsCollector):
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self.stats: StatsCollector = stats
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self.start_time: datetime | None = None
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self._start_time_mono: float | None = None
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@classmethod
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def from_crawler(cls, crawler: Crawler) -> Self:
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o = cls(crawler.stats)
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crawler.signals.connect(o.spider_opened, signal=signals.spider_opened)
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crawler.signals.connect(o.spider_closed, signal=signals.spider_closed)
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crawler.signals.connect(o.item_scraped, signal=signals.item_scraped)
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crawler.signals.connect(o.item_dropped, signal=signals.item_dropped)
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crawler.signals.connect(o.response_received, signal=signals.response_received)
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return o
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def spider_opened(self, spider: Spider) -> None:
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self.start_time = datetime.now(tz=timezone.utc)
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self._start_time_mono = monotonic()
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self.stats.set_value("start_time", self.start_time)
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def spider_closed(self, spider: Spider, reason: str) -> None:
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assert self.start_time is not None
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assert self._start_time_mono is not None
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finish_time, finish_time_mono = datetime.now(tz=timezone.utc), monotonic()
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elapsed_time_seconds = finish_time_mono - self._start_time_mono
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self.stats.set_value("elapsed_time_seconds", elapsed_time_seconds)
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self.stats.set_value("finish_time", finish_time)
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self.stats.set_value("finish_reason", reason)
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def item_scraped(self, item: Any, spider: Spider) -> None:
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self.stats.inc_value("item_scraped_count")
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def response_received(self, spider: Spider) -> None:
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self.stats.inc_value("response_received_count")
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def item_dropped(self, item: Any, spider: Spider, exception: BaseException) -> None:
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reason = exception.__class__.__name__
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self.stats.inc_value("item_dropped_count")
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self.stats.inc_value(f"item_dropped_reasons_count/{reason}")
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