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from __future__ import annotations
from typing import TYPE_CHECKING
import pytest
from scrapy import Spider
from scrapy.exceptions import NotConfigured, ScrapyDeprecationWarning
from scrapy.middleware import MiddlewareManager
from scrapy.utils.test import get_crawler
if TYPE_CHECKING:
from scrapy.crawler import Crawler
class M1:
def open_spider(self, spider):
pass
def close_spider(self, spider):
pass
def process(self, response, request):
pass
class M2:
def open_spider(self, spider):
pass
def close_spider(self, spider):
pass
class M3:
def process(self, response, request):
pass
class MOff:
def open_spider(self, spider):
pass
def close_spider(self, spider):
pass
def __init__(self):
raise NotConfigured("foo")
class MyMiddlewareManager(MiddlewareManager):
component_name = "my"
@classmethod
def _get_mwlist_from_settings(cls, settings):
return [M1, MOff, M3]
def _add_middleware(self, mw):
if hasattr(mw, "open_spider"):
self.methods["open_spider"].append(mw.open_spider)
if hasattr(mw, "close_spider"):
self.methods["close_spider"].appendleft(mw.close_spider)
if hasattr(mw, "process"):
self.methods["process"].append(mw.process)
@pytest.fixture
def crawler() -> Crawler:
return get_crawler(Spider)
def test_init(crawler: Crawler) -> None:
m1, m2, m3 = M1(), M2(), M3()
mwman = MyMiddlewareManager(m1, m2, m3, crawler=crawler)
assert list(mwman.methods["open_spider"]) == [m1.open_spider, m2.open_spider]
assert list(mwman.methods["close_spider"]) == [m2.close_spider, m1.close_spider]
assert list(mwman.methods["process"]) == [m1.process, m3.process]
assert mwman.crawler == crawler
def test_methods(crawler: Crawler) -> None:
mwman = MyMiddlewareManager(M1(), M2(), M3(), crawler=crawler)
assert [x.__self__.__class__ for x in mwman.methods["open_spider"]] == [M1, M2] # type: ignore[union-attr]
assert [x.__self__.__class__ for x in mwman.methods["close_spider"]] == [M2, M1] # type: ignore[union-attr]
assert [x.__self__.__class__ for x in mwman.methods["process"]] == [M1, M3] # type: ignore[union-attr]
def test_enabled(crawler: Crawler) -> None:
m1, m2, m3 = M1(), M2(), M3()
mwman = MyMiddlewareManager(m1, m2, m3, crawler=crawler)
assert mwman.middlewares == (m1, m2, m3)
def test_enabled_from_settings(crawler: Crawler) -> None:
crawler = get_crawler()
mwman = MyMiddlewareManager.from_crawler(crawler)
classes = [x.__class__ for x in mwman.middlewares]
assert classes == [M1, M3]
assert mwman.crawler == crawler
def test_no_crawler() -> None:
m1, m2, m3 = M1(), M2(), M3()
with pytest.warns(
ScrapyDeprecationWarning, match="was called without the crawler argument"
):
mwman = MyMiddlewareManager(m1, m2, m3)
assert mwman.middlewares == (m1, m2, m3)
assert mwman.crawler is None
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