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import unittest
from testfixtures import LogCapture
from twisted.internet import defer
from twisted.python.failure import Failure
from twisted.trial.unittest import TestCase as TwistedTestCase
from scrapy.crawler import CrawlerRunner
from scrapy.exceptions import DropItem
from scrapy.http import Request, Response
from scrapy.item import Item, Field
from scrapy.logformatter import LogFormatter
from scrapy.spiders import Spider
from tests.mockserver import MockServer
from tests.spiders import ItemSpider
class CustomItem(Item):
name = Field()
def __str__(self):
return f"name: {self['name']}"
class LogFormatterTestCase(unittest.TestCase):
def setUp(self):
self.formatter = LogFormatter()
self.spider = Spider('default')
def test_crawled_with_referer(self):
req = Request("http://www.example.com")
res = Response("http://www.example.com")
logkws = self.formatter.crawled(req, res, self.spider)
logline = logkws['msg'] % logkws['args']
self.assertEqual(logline, "Crawled (200) <GET http://www.example.com> (referer: None)")
def test_crawled_without_referer(self):
req = Request("http://www.example.com", headers={'referer': 'http://example.com'})
res = Response("http://www.example.com", flags=['cached'])
logkws = self.formatter.crawled(req, res, self.spider)
logline = logkws['msg'] % logkws['args']
self.assertEqual(
logline,
"Crawled (200) <GET http://www.example.com> (referer: http://example.com) ['cached']")
def test_flags_in_request(self):
req = Request("http://www.example.com", flags=['test', 'flag'])
res = Response("http://www.example.com")
logkws = self.formatter.crawled(req, res, self.spider)
logline = logkws['msg'] % logkws['args']
self.assertEqual(
logline,
"Crawled (200) <GET http://www.example.com> ['test', 'flag'] (referer: None)")
def test_dropped(self):
item = {}
exception = Exception("\u2018")
response = Response("http://www.example.com")
logkws = self.formatter.dropped(item, exception, response, self.spider)
logline = logkws['msg'] % logkws['args']
lines = logline.splitlines()
assert all(isinstance(x, str) for x in lines)
self.assertEqual(lines, ["Dropped: \u2018", '{}'])
def test_item_error(self):
# In practice, the complete traceback is shown by passing the
# 'exc_info' argument to the logging function
item = {'key': 'value'}
exception = Exception()
response = Response("http://www.example.com")
logkws = self.formatter.item_error(item, exception, response, self.spider)
logline = logkws['msg'] % logkws['args']
self.assertEqual(logline, "Error processing {'key': 'value'}")
def test_spider_error(self):
# In practice, the complete traceback is shown by passing the
# 'exc_info' argument to the logging function
failure = Failure(Exception())
request = Request("http://www.example.com", headers={'Referer': 'http://example.org'})
response = Response("http://www.example.com", request=request)
logkws = self.formatter.spider_error(failure, request, response, self.spider)
logline = logkws['msg'] % logkws['args']
self.assertEqual(
logline,
"Spider error processing <GET http://www.example.com> (referer: http://example.org)"
)
def test_download_error_short(self):
# In practice, the complete traceback is shown by passing the
# 'exc_info' argument to the logging function
failure = Failure(Exception())
request = Request("http://www.example.com")
logkws = self.formatter.download_error(failure, request, self.spider)
logline = logkws['msg'] % logkws['args']
self.assertEqual(logline, "Error downloading <GET http://www.example.com>")
def test_download_error_long(self):
# In practice, the complete traceback is shown by passing the
# 'exc_info' argument to the logging function
failure = Failure(Exception())
request = Request("http://www.example.com")
logkws = self.formatter.download_error(failure, request, self.spider, "Some message")
logline = logkws['msg'] % logkws['args']
self.assertEqual(logline, "Error downloading <GET http://www.example.com>: Some message")
def test_scraped(self):
item = CustomItem()
item['name'] = '\xa3'
response = Response("http://www.example.com")
logkws = self.formatter.scraped(item, response, self.spider)
logline = logkws['msg'] % logkws['args']
lines = logline.splitlines()
assert all(isinstance(x, str) for x in lines)
self.assertEqual(lines, ["Scraped from <200 http://www.example.com>", 'name: \xa3'])
class LogFormatterSubclass(LogFormatter):
def crawled(self, request, response, spider):
kwargs = super().crawled(request, response, spider)
CRAWLEDMSG = (
"Crawled (%(status)s) %(request)s (referer: %(referer)s) %(flags)s"
)
log_args = kwargs['args']
log_args['flags'] = str(request.flags)
return {
'level': kwargs['level'],
'msg': CRAWLEDMSG,
'args': log_args,
}
class LogformatterSubclassTest(LogFormatterTestCase):
def setUp(self):
self.formatter = LogFormatterSubclass()
self.spider = Spider('default')
def test_crawled_with_referer(self):
req = Request("http://www.example.com")
res = Response("http://www.example.com")
logkws = self.formatter.crawled(req, res, self.spider)
logline = logkws['msg'] % logkws['args']
self.assertEqual(
logline,
"Crawled (200) <GET http://www.example.com> (referer: None) []")
def test_crawled_without_referer(self):
req = Request("http://www.example.com", headers={'referer': 'http://example.com'}, flags=['cached'])
res = Response("http://www.example.com")
logkws = self.formatter.crawled(req, res, self.spider)
logline = logkws['msg'] % logkws['args']
self.assertEqual(
logline,
"Crawled (200) <GET http://www.example.com> (referer: http://example.com) ['cached']")
def test_flags_in_request(self):
req = Request("http://www.example.com", flags=['test', 'flag'])
res = Response("http://www.example.com")
logkws = self.formatter.crawled(req, res, self.spider)
logline = logkws['msg'] % logkws['args']
self.assertEqual(
logline,
"Crawled (200) <GET http://www.example.com> (referer: None) ['test', 'flag']")
class SkipMessagesLogFormatter(LogFormatter):
def crawled(self, *args, **kwargs):
return None
def scraped(self, *args, **kwargs):
return None
def dropped(self, *args, **kwargs):
return None
class DropSomeItemsPipeline:
drop = True
def process_item(self, item, spider):
if self.drop:
self.drop = False
raise DropItem("Ignoring item")
else:
self.drop = True
class ShowOrSkipMessagesTestCase(TwistedTestCase):
def setUp(self):
self.mockserver = MockServer()
self.mockserver.__enter__()
self.base_settings = {
'LOG_LEVEL': 'DEBUG',
'ITEM_PIPELINES': {
DropSomeItemsPipeline: 300,
},
}
def tearDown(self):
self.mockserver.__exit__(None, None, None)
@defer.inlineCallbacks
def test_show_messages(self):
crawler = CrawlerRunner(self.base_settings).create_crawler(ItemSpider)
with LogCapture() as lc:
yield crawler.crawl(mockserver=self.mockserver)
self.assertIn("Scraped from <200 http://127.0.0.1:", str(lc))
self.assertIn("Crawled (200) <GET http://127.0.0.1:", str(lc))
self.assertIn("Dropped: Ignoring item", str(lc))
@defer.inlineCallbacks
def test_skip_messages(self):
settings = self.base_settings.copy()
settings['LOG_FORMATTER'] = SkipMessagesLogFormatter
crawler = CrawlerRunner(settings).create_crawler(ItemSpider)
with LogCapture() as lc:
yield crawler.crawl(mockserver=self.mockserver)
self.assertNotIn("Scraped from <200 http://127.0.0.1:", str(lc))
self.assertNotIn("Crawled (200) <GET http://127.0.0.1:", str(lc))
self.assertNotIn("Dropped: Ignoring item", str(lc))
if __name__ == "__main__":
unittest.main()
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