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"""
Queues that handle requests
"""
import shutil
import tempfile
import unittest
import pytest
import queuelib
from scrapy.http import Request
from scrapy.spiders import Spider
from scrapy.squeues import (
FifoMemoryQueue,
LifoMemoryQueue,
MarshalFifoDiskQueue,
MarshalLifoDiskQueue,
PickleFifoDiskQueue,
PickleLifoDiskQueue,
)
from scrapy.utils.test import get_crawler
class TestBaseQueue:
def setup_method(self):
self.tmpdir = tempfile.mkdtemp(prefix="scrapy-queue-tests-")
self.qpath = self.tempfilename()
self.qdir = tempfile.mkdtemp()
self.crawler = get_crawler(Spider)
def teardown_method(self):
shutil.rmtree(self.tmpdir)
def tempfilename(self):
with tempfile.NamedTemporaryFile(dir=self.tmpdir) as nf:
return nf.name
def mkdtemp(self):
return tempfile.mkdtemp(dir=self.tmpdir)
class RequestQueueTestMixin:
def queue(self):
raise NotImplementedError
def test_one_element_with_peek(self):
if not hasattr(queuelib.queue.FifoMemoryQueue, "peek"):
raise unittest.SkipTest("The queuelib queues do not define peek")
q = self.queue()
assert len(q) == 0
assert q.peek() is None
assert q.pop() is None
req = Request("http://www.example.com")
q.push(req)
assert len(q) == 1
assert q.peek().url == req.url
assert q.pop().url == req.url
assert len(q) == 0
assert q.peek() is None
assert q.pop() is None
q.close()
def test_one_element_without_peek(self):
if hasattr(queuelib.queue.FifoMemoryQueue, "peek"):
raise unittest.SkipTest("The queuelib queues define peek")
q = self.queue()
assert len(q) == 0
assert q.pop() is None
req = Request("http://www.example.com")
q.push(req)
assert len(q) == 1
with pytest.raises(
NotImplementedError,
match="The underlying queue class does not implement 'peek'",
):
q.peek()
assert q.pop().url == req.url
assert len(q) == 0
assert q.pop() is None
q.close()
class FifoQueueMixin(RequestQueueTestMixin):
def test_fifo_with_peek(self):
if not hasattr(queuelib.queue.FifoMemoryQueue, "peek"):
raise unittest.SkipTest("The queuelib queues do not define peek")
q = self.queue()
assert len(q) == 0
assert q.peek() is None
assert q.pop() is None
req1 = Request("http://www.example.com/1")
req2 = Request("http://www.example.com/2")
req3 = Request("http://www.example.com/3")
q.push(req1)
q.push(req2)
q.push(req3)
assert len(q) == 3
assert q.peek().url == req1.url
assert q.pop().url == req1.url
assert len(q) == 2
assert q.peek().url == req2.url
assert q.pop().url == req2.url
assert len(q) == 1
assert q.peek().url == req3.url
assert q.pop().url == req3.url
assert len(q) == 0
assert q.peek() is None
assert q.pop() is None
q.close()
def test_fifo_without_peek(self):
if hasattr(queuelib.queue.FifoMemoryQueue, "peek"):
raise unittest.SkipTest("The queuelib queues do not define peek")
q = self.queue()
assert len(q) == 0
assert q.pop() is None
req1 = Request("http://www.example.com/1")
req2 = Request("http://www.example.com/2")
req3 = Request("http://www.example.com/3")
q.push(req1)
q.push(req2)
q.push(req3)
with pytest.raises(
NotImplementedError,
match="The underlying queue class does not implement 'peek'",
):
q.peek()
assert len(q) == 3
assert q.pop().url == req1.url
assert len(q) == 2
assert q.pop().url == req2.url
assert len(q) == 1
assert q.pop().url == req3.url
assert len(q) == 0
assert q.pop() is None
q.close()
class LifoQueueMixin(RequestQueueTestMixin):
def test_lifo_with_peek(self):
if not hasattr(queuelib.queue.FifoMemoryQueue, "peek"):
raise unittest.SkipTest("The queuelib queues do not define peek")
q = self.queue()
assert len(q) == 0
assert q.peek() is None
assert q.pop() is None
req1 = Request("http://www.example.com/1")
req2 = Request("http://www.example.com/2")
req3 = Request("http://www.example.com/3")
q.push(req1)
q.push(req2)
q.push(req3)
assert len(q) == 3
assert q.peek().url == req3.url
assert q.pop().url == req3.url
assert len(q) == 2
assert q.peek().url == req2.url
assert q.pop().url == req2.url
assert len(q) == 1
assert q.peek().url == req1.url
assert q.pop().url == req1.url
assert len(q) == 0
assert q.peek() is None
assert q.pop() is None
q.close()
def test_lifo_without_peek(self):
if hasattr(queuelib.queue.FifoMemoryQueue, "peek"):
raise unittest.SkipTest("The queuelib queues do not define peek")
q = self.queue()
assert len(q) == 0
assert q.pop() is None
req1 = Request("http://www.example.com/1")
req2 = Request("http://www.example.com/2")
req3 = Request("http://www.example.com/3")
q.push(req1)
q.push(req2)
q.push(req3)
with pytest.raises(
NotImplementedError,
match="The underlying queue class does not implement 'peek'",
):
q.peek()
assert len(q) == 3
assert q.pop().url == req3.url
assert len(q) == 2
assert q.pop().url == req2.url
assert len(q) == 1
assert q.pop().url == req1.url
assert len(q) == 0
assert q.pop() is None
q.close()
class TestPickleFifoDiskQueueRequest(FifoQueueMixin, TestBaseQueue):
def queue(self):
return PickleFifoDiskQueue.from_crawler(crawler=self.crawler, key="pickle/fifo")
class TestPickleLifoDiskQueueRequest(LifoQueueMixin, TestBaseQueue):
def queue(self):
return PickleLifoDiskQueue.from_crawler(crawler=self.crawler, key="pickle/lifo")
class TestMarshalFifoDiskQueueRequest(FifoQueueMixin, TestBaseQueue):
def queue(self):
return MarshalFifoDiskQueue.from_crawler(
crawler=self.crawler, key="marshal/fifo"
)
class TestMarshalLifoDiskQueueRequest(LifoQueueMixin, TestBaseQueue):
def queue(self):
return MarshalLifoDiskQueue.from_crawler(
crawler=self.crawler, key="marshal/lifo"
)
class TestFifoMemoryQueueRequest(FifoQueueMixin, TestBaseQueue):
def queue(self):
return FifoMemoryQueue.from_crawler(crawler=self.crawler)
class TestLifoMemoryQueueRequest(LifoQueueMixin, TestBaseQueue):
def queue(self):
return LifoMemoryQueue.from_crawler(crawler=self.crawler)
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