class StoreBitArrayTests(unittest.TestCase):
'Whenever we change a BloomFilter, ensure that we Memcache our changes.'
def setUp(self):
super(self.__class__, self).setUp()
self.dilberts = BloomFilter({'rajiv', 'raj'}, key='dilberts')
def tearDown(self):
self.dilberts.memcache.delete(self.dilberts.key)
super(self.__class__, self).tearDown()
def test_init_gets_stored(self):
'When we __init__() on an iterable, ensure we Memcache the bit array'
office_space = BloomFilter(key='dilberts')
assert office_space._bit_array == self.dilberts._bit_array
def test_add_gets_stored(self):
'When we add() an element, ensure that we Memcache the bit array'
self.dilberts.add('dan')
office_space = BloomFilter(key='dilberts')
assert office_space._bit_array == self.dilberts._bit_array
def test_update_gets_stored(self):
'When we update() with elements, ensure that we Memcache the bit array'
self.dilberts.update({'dan', 'eric'})
office_space = BloomFilter(key='dilberts')
assert office_space._bit_array == self.dilberts._bit_array
def test_clear_gets_stored(self):
'When we clear() all elements, ensure that we Memcache the bit array'
self.dilberts.clear()
office_space = BloomFilter(key='dilberts')
assert office_space._bit_array == self.dilberts._bit_array
def main():
print("Hello!")
try:
client = MongoClient("mongodb+srv://amartya:[email protected]/test?retryWrites=true&w=majority")
except ConnectionError:
print("Server not available")
bloom_test = BloomFilter(20, 0.02)
bloom_test.add("basu")
bloom_test.add("basu")
if "basu" in bloom_test:
print("Object exists")
else:
print("The searched item does NOT exist in the cache. Read from persistent datastore")
def create_bloom(set, capacity=3000, error_rate=0.001):
# Create Bloom filter
bf = BloomFilter(capacity=capacity, error_rate=error_rate)
for x in set:
bf.add(x)
return bf
# Nombres de usuarios a ser añadidos
nombres_existentes = [
'ironman', 'thor', 'american_captain', 'spiderman', 'loki', 'wolverine',
'black_widow', 'hulk', 'deadpool', 'nick_fury', 'thanos', 'Dr_strange',
'venon', 'odin', 'magneto', 'black_panter', 'rocket', 'gamora', 'ultron',
'groot', 'ant_man'
]
# Palabras no existentes
nombres_no_existentes = [
'superman', 'batman', 'wonder_woman', 'green_Lantern', 'he_Man', 'batgirl',
'lion_O', 'shazam', 'aquaman', 'green_arrow', 'flash', 'tygro', 'Cheetara'
]
for item in nombres_existentes:
bloom_filtro.add(item)
shuffle(nombres_existentes)
shuffle(nombres_no_existentes)
prueba = nombres_existentes[:10] + nombres_no_existentes
shuffle(prueba)
print("=======================================================")
for word in prueba:
if bloom_filtro.check(word):
if word in nombres_no_existentes:
print("'{}' es un falso positivo!".format(word))
else:
print("'{}' probablemente existe!".format(word))
else:
print("'{}' definitivamente no existe!".format(word))
print("Optimal number of Hash Functions:{}\n".format(bloom_obj.hash))
# words to be added
word_present = [
'abound', 'abounds', 'abundance', 'abundant', 'accessable', 'bloom',
'blossom', 'bolster', 'bonny', 'bonus', 'bonuses'
]
# word not added
word_absent = [
'bluff', 'cheater', 'hate', 'war', 'humanity', 'racism', 'hurt', 'nuke',
'gloomy', 'facebook'
]
for item in word_present:
bloom_obj.add(item)
shuffle(word_present)
shuffle(word_absent)
test_words = word_present[:10] + word_absent
shuffle(test_words)
for word in test_words:
if bloom_obj.check(word):
if word in word_absent:
print("'{}' is a false positive!".format(word))
else:
print("'{}' is probably present!".format(word))
else:
print("'{}' is definitely not present!".format(word))
def test_add(self):
dilberts = BloomFilter()
assert 'rajiv' not in dilberts
assert 'raj' not in dilberts
assert 'dan' not in dilberts
assert 'eric' not in dilberts
assert len(dilberts) == 0
dilberts.add('rajiv')
assert 'rajiv' in dilberts
assert 'raj' not in dilberts
assert 'dan' not in dilberts
assert 'eric' not in dilberts
assert len(dilberts) == 1
dilberts.add('raj')
assert 'rajiv' in dilberts
assert 'raj' in dilberts
assert 'dan' not in dilberts
assert 'eric' not in dilberts
assert len(dilberts) == 2
dilberts.add('rajiv')
assert 'rajiv' in dilberts
assert 'raj' in dilberts
assert 'dan' not in dilberts
assert 'eric' not in dilberts
assert len(dilberts) == 2
dilberts.add('raj')
assert 'rajiv' in dilberts
assert 'raj' in dilberts
assert 'dan' not in dilberts
assert 'eric' not in dilberts
assert len(dilberts) == 2
dilberts.add('dan')
assert 'rajiv' in dilberts
assert 'raj' in dilberts
assert 'dan' in dilberts
assert 'eric' not in dilberts
assert len(dilberts) == 3
dilberts.add('eric')
assert 'rajiv' in dilberts
assert 'raj' in dilberts
assert 'dan' in dilberts
assert 'eric' in dilberts
assert len(dilberts) == 4
def test_item_in_filter(self):
word = "dog"
filter = BloomFilter(10)
filter.add(word)
self.assertIn(word, filter)
def test():
''' basic testing functions '''
blm = BloomFilter()
blm.init(10, 0.05)
blm.add("this is a test")
print(blm.check("this is a test"))
print(blm.check("blah"))
print(blm)
print(blm.bloom_array)
blm.export('./dist/py_bloom.blm')
print('\n\ncheck imported BloomFilter!')
blm2 = BloomFilter()
blm2.load('./dist/py_bloom.blm')
print(blm2.check("this is a test"))
print(blm2.check("blah"))
print(blm2)
print(blm2.bloom_array)
blm2.add('yet another test')
print("\n\ncheck intersection")
blm3 = blm.intersection(blm2)
print(blm3)
print(blm3.check("this is a test"))
print(blm3.check("yet another test"))
print("\n\ncheck union")
blm3 = blm.union(blm2)
print(blm3)
print(blm3.check("this is a test"))
print('\n\ntest using `in`')
print("this is a test" in blm3)
print(blm3.check("yet another test"))
print(blm3.estimate_elements())
print(blm.jaccard_index(blm2))
print ('\n\nexport to hex')
hex_out = blm.export_hex()
print(hex_out)
print('import hex')
blm4 = BloomFilter()
blm4.load_hex(hex_out)
print(blm4)
# on disk code check
print('\n\nbloom filter on disk')
blmd = BloomFilterOnDisk()
blmd.initialize('./dist/py_ondisk.blm', 10, 0.05)
blmd.add("this is a test")
print(blmd.check('this is a test'))
print('Check use of in keyword ("this is a test" in blmd): ',
'this is a test' in blmd)
print(blmd.check('yet another test'))
# blmd.union(blm4)
# blmd.intersection(blm)
# print(blmd.jaccard_index(blm2))
print(blmd)
# print ('\n\nexport to hex')
# hex_out = blmd.export_hex()
# print(hex_out)
blmd.close()
count = (size / MAX_SIZE) * log(2)
optimalSize = int(complex(size).real)
optimalCount = int(complex(count).real)
print optimalSize, optimalCount
bloom = BloomFilter(optimalSize, optimalCount)
falsePositive = False
inserted = 0;
falseValue = "";
while not falsePositive:
for i in range(MAX_SIZE / 100):
bloom.add(generateValue())
inserted += 1
print(bloom)
for i in range(MAX_SIZE / 100):
falseValue = generateOther()
falsePositive = (falseValue in bloom)
if falsePositive:
break;
print "========================="
print "False positive at '", falseValue, "' after ", inserted, " insertions"
