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import os, glob
from twisted.trial import unittest
from scrapy.utils.queue import FifoMemoryQueue, LifoMemoryQueue, FifoDiskQueue, LifoDiskQueue
class FifoMemoryQueueTest(unittest.TestCase):
def queue(self):
return FifoMemoryQueue()
def test_empty(self):
"""Empty queue test"""
q = self.queue()
assert q.pop() is None
def test_push_pop1(self):
"""Basic push/pop test"""
q = self.queue()
q.push('a')
q.push('b')
q.push('c')
self.assertEqual(q.pop(), 'a')
self.assertEqual(q.pop(), 'b')
self.assertEqual(q.pop(), 'c')
self.assertEqual(q.pop(), None)
def test_push_pop2(self):
"""Test interleaved push and pops"""
q = self.queue()
q.push('a')
q.push('b')
q.push('c')
q.push('d')
self.assertEqual(q.pop(), 'a')
self.assertEqual(q.pop(), 'b')
q.push('e')
self.assertEqual(q.pop(), 'c')
self.assertEqual(q.pop(), 'd')
self.assertEqual(q.pop(), 'e')
def test_len(self):
q = self.queue()
self.assertEqual(len(q), 0)
q.push('a')
self.assertEqual(len(q), 1)
q.push('b')
q.push('c')
self.assertEqual(len(q), 3)
q.pop()
q.pop()
q.pop()
self.assertEqual(len(q), 0)
class LifoMemoryQueueTest(unittest.TestCase):
def queue(self):
return LifoMemoryQueue()
def test_empty(self):
"""Empty queue test"""
q = self.queue()
assert q.pop() is None
def test_push_pop1(self):
"""Basic push/pop test"""
q = self.queue()
q.push('a')
q.push('b')
q.push('c')
self.assertEqual(q.pop(), 'c')
self.assertEqual(q.pop(), 'b')
self.assertEqual(q.pop(), 'a')
self.assertEqual(q.pop(), None)
def test_push_pop2(self):
"""Test interleaved push and pops"""
q = self.queue()
q.push('a')
q.push('b')
q.push('c')
q.push('d')
self.assertEqual(q.pop(), 'd')
self.assertEqual(q.pop(), 'c')
q.push('e')
self.assertEqual(q.pop(), 'e')
self.assertEqual(q.pop(), 'b')
self.assertEqual(q.pop(), 'a')
def test_len(self):
q = self.queue()
self.assertEqual(len(q), 0)
q.push('a')
self.assertEqual(len(q), 1)
q.push('b')
q.push('c')
self.assertEqual(len(q), 3)
q.pop()
q.pop()
q.pop()
self.assertEqual(len(q), 0)
class FifoDiskQueueTest(FifoMemoryQueueTest):
chunksize = 100000
def setUp(self):
self.qdir = self.mktemp()
def queue(self):
return FifoDiskQueue(self.qdir, chunksize=self.chunksize)
def test_close_open(self):
"""Test closing and re-opening keeps state"""
q = self.queue()
q.push('a')
q.push('b')
q.push('c')
q.push('d')
self.assertEqual(q.pop(), 'a')
self.assertEqual(q.pop(), 'b')
q.close()
del q
q = self.queue()
self.assertEqual(len(q), 2)
q.push('e')
self.assertEqual(q.pop(), 'c')
self.assertEqual(q.pop(), 'd')
q.close()
del q
q = self.queue()
self.assertEqual(q.pop(), 'e')
self.assertEqual(len(q), 0)
def test_chunks(self):
"""Test chunks are created and removed"""
q = self.queue()
for x in range(5):
q.push(str(x))
chunks = glob.glob(os.path.join(self.qdir, 'q*'))
self.assertEqual(len(chunks), 5/self.chunksize + 1)
for x in range(5):
q.pop()
chunks = glob.glob(os.path.join(self.qdir, 'q*'))
self.assertEqual(len(chunks), 1)
def test_cleanup(self):
"""Test queue dir is removed if queue is empty"""
q = self.queue()
assert os.path.exists(self.qdir)
for x in range(5):
q.push(str(x))
for x in range(5):
q.pop()
q.close()
assert not os.path.exists(self.qdir)
class ChunkSize1FifoDiskQueueTest(FifoDiskQueueTest):
chunksize = 1
class ChunkSize2FifoDiskQueueTest(FifoDiskQueueTest):
chunksize = 2
class ChunkSize3FifoDiskQueueTest(FifoDiskQueueTest):
chunksize = 3
class ChunkSize4FifoDiskQueueTest(FifoDiskQueueTest):
chunksize = 4
class LifoDiskQueueTest(LifoMemoryQueueTest):
def setUp(self):
self.path = self.mktemp()
def queue(self):
return LifoDiskQueue(self.path)
def test_close_open(self):
"""Test closing and re-opening keeps state"""
q = self.queue()
q.push('a')
q.push('b')
q.push('c')
q.push('d')
self.assertEqual(q.pop(), 'd')
self.assertEqual(q.pop(), 'c')
q.close()
del q
q = self.queue()
self.assertEqual(len(q), 2)
q.push('e')
self.assertEqual(q.pop(), 'e')
self.assertEqual(q.pop(), 'b')
q.close()
del q
q = self.queue()
self.assertEqual(q.pop(), 'a')
self.assertEqual(len(q), 0)
def test_cleanup(self):
"""Test queue file is removed if queue is empty"""
q = self.queue()
assert os.path.exists(self.path)
for x in range(5):
q.push(str(x))
for x in range(5):
q.pop()
q.close()
assert not os.path.exists(self.path)
def test_file_size_shrinks(self):
"""Test size of queue file shrinks when popping items"""
q = self.queue()
q.push('a')
q.push('b')
q.close()
size = os.path.getsize(self.path)
q = self.queue()
q.pop()
q.close()
assert os.path.getsize(self.path), size
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