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fix deprecated calls to scrapy.utils.request.request_fingerprint #50

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fix deprecated calls to scrapy.utils.request.request_fingerprint #50

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3740fdf
ci: update python versions to test against
vinnymeller Nov 19, 2024
a9cd2da
fix: update calls to removed function request_fingerprint
vinnymeller Nov 19, 2024
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fix: update calls to removed function request_fingerprint
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@vinnymeller
vinnymeller committed Nov 19, 2024
commit a9cd2dad048129f803ea47d005fdc15aa1c6a8fa
4 changes: 2 additions & 2 deletions scrapy_deltafetch/middleware.py
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Original file line number Diff line number Diff line change
Expand Up @@ -5,7 +5,7 @@

from scrapy.http import Request
from scrapy.item import Item
from scrapy.utils.request import request_fingerprint
from scrapy.utils.request import fingerprint
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@Gallaecio Gallaecio Nov 19, 2024

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On Scrapy 2.7+, the right approach is using Crawler.fingerprinter.fingerprint().

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@vinnymeller vinnymeller Nov 24, 2024

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@Gallaecio wouldn't using this require storing an instance of (and instantiating) a Crawler object as an instance variable?

from the messages in scrapy 2.11.2 (https://github.com/scrapy/scrapy/blob/e8cb5a03b382b98f2c8945355076390f708b918d/scrapy/utils/request.py#L86-L136) it seems to suggest getting the crawler during instantiation with DeltaFetch.from_crawler if I am reading it right.

but what if the DeltaFetch object isn't instantiated that way? what should happen in DeltaFetch._get_key?

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@Gallaecio Gallaecio Nov 25, 2024 •
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DeltaFetch is a spider middleware, instantiated by Scrapy.

Most Scrapy components are instantiated with the create_instance (Scrapy 2.11-) / build_from_crawler (Scrapy 2.12+) functions, which call from_crawler if defined. Spider middlewares are definitely one of those components. So __init__ should never be called without first calling from_crawler.

It does happen in tests, that use self.mwcls(), and would need to change to either use from_crawler or, better yet, use create_instance / build_from_crawler.

from scrapy.utils.project import data_path
from scrapy.utils.python import to_bytes
from scrapy.exceptions import NotConfigured
Expand Down Expand Up @@ -79,7 +79,7 @@ def process_spider_output(self, response, result, spider):
yield r

def _get_key(self, request):
key = request.meta.get('deltafetch_key') or request_fingerprint(request)
key = request.meta.get('deltafetch_key') or fingerprint(request)
return to_bytes(key)

def _is_enabled_for_request(self, request):
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4 changes: 2 additions & 2 deletions tests/test_deltafetch.py
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Original file line number Diff line number Diff line change
Expand Up @@ -9,7 +9,7 @@
from scrapy.spiders import Spider
from scrapy.settings import Settings
from scrapy.exceptions import NotConfigured
from scrapy.utils.request import request_fingerprint
from scrapy.utils.request import fingerprint
from scrapy.utils.python import to_bytes
from scrapy.statscollectors import StatsCollector
from scrapy.utils.test import get_crawler
Expand Down Expand Up @@ -319,7 +319,7 @@ def test_get_key(self):
mw = self.mwcls(self.temp_dir, reset=True)
test_req1 = Request('http://url1')
self.assertEqual(mw._get_key(test_req1),
to_bytes(request_fingerprint(test_req1)))
to_bytes(fingerprint(test_req1)))
test_req2 = Request('http://url2', meta={'deltafetch_key': b'dfkey1'})
self.assertEqual(mw._get_key(test_req2), b'dfkey1')

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