class TestBloomFilter(unittest.TestCase):
def setUp(self):
self.size = 500000
self.hash_count = 7
self.bf = BloomFilter(self.size, self.hash_count)
lst = ['abc', 'xyz', 'foo', 'bar']
for item in lst:
self.bf.add(item)
def _initialize(self):
pass
def _cleanup(self):
if self.bf:
del(self.bf)
self.bf = None
def test_lookup_yes(self):
self.assertEqual(self.bf.lookup('foo'), True)
def test_lookup_no(self):
self.assertEqual(self.bf.lookup('hello'), False)
def tearDown(self):
self._cleanup()
def build_bf(n, p, ref_fasta):
# call bloom filter class and output stats
bloomf = BloomFilter(n, p)
print("Size of bit array:{}".format(bloomf.size))
print("False positive Probability:{}".format(bloomf.fp_prob))
print("Number of hash functions:{}".format(bloomf.hash_count))
mycoplasma_fasta = open(ref_fasta, 'r')
N_count = 0
read_count = 0
while True:
name = mycoplasma_fasta.readline() # read id
if len(name) == 0:
break # end of file
read = mycoplasma_fasta.readline().strip()
if 'N' not in read:
# do not add any uncalled bases
bloomf.add(read)
read_count += 1
else:
N_count += 1
print('N_count = %s' % N_count)
print('read_count = %s' % read_count)
mycoplasma_fasta.close()
return bloomf
class BloomFilterMR(MRJob):
def __init__(self, *args, **kwargs):
super(BloomFilterMR, self).__init__(*args, **kwargs)
self.n = 20
self.p = 0.05
self.hot_list = [1,8,14,12,23,31,55]
#defining steps
def steps(self):
return [
MRStep(mapper_init=self.mapper_init
,mapper=self.mapper
)
]
def mapper_init(self):
self.bloomf = BloomFilter(self.n,self.p)
for elem in self.hot_list:
self.bloomf.add(str(elem))
#MapReduce Phase 1 : convert temperature data into city,day,temp,temp_count
def mapper(self, _, line):
(city,temp,timestamp) = line.split('|')
if self.bloomf.check(temp):
yield city,(temp,timestamp)
def test_exercise_2(self):
block_hash = bytes.fromhex(
'0000000053787814ed9dd8c029d0a0a9af4ab8ec0591dc31bdc4ab31fae88ce9')
passphrase = b'Jimmy Song Programming Blockchain' # FILL THIS IN
secret = little_endian_to_int(hash256(passphrase))
private_key = PrivateKey(secret=secret)
addr = private_key.point.address(testnet=True)
filter_size = 30
filter_num_functions = 5
filter_tweak = 90210 # FILL THIS IN
h160 = decode_base58(addr)
bf = BloomFilter(filter_size, filter_num_functions, filter_tweak)
bf.add(h160)
node = SimpleNode('tbtc.programmingblockchain.com',
testnet=True,
logging=False)
node.handshake()
node.send(bf.filterload())
getdata = GetDataMessage()
getdata.add_data(FILTERED_BLOCK_DATA_TYPE, block_hash)
node.send(getdata)
mb = node.wait_for(MerkleBlock)
tx = node.wait_for(Tx)
self.assertEqual(
tx.serialize().hex(),
'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'
)
def main():
number_of_items = 20
false_positive_probability = 0.1
bloom = BloomFilter(number_of_items, false_positive_probability)
word_present = [
'abound', 'abounds', 'abundance', 'abundant', 'accessable', 'bloom',
'blossom', 'bolster', 'bonny', 'bonus', 'bonuses', 'coherent',
'cohesive', 'colorful', 'comely', 'comfort', 'gems', 'generosity',
'generous', 'generously', 'genial'
]
word_absent = [
'bluff', 'cheater', 'hate', 'war', 'humanity', 'racism', 'hurt',
'nuke', 'gloomy', 'facebook', 'geeksforgeeks', 'twitter'
]
print('bloomfilter size: ', bloom.bit_size)
print('false_positive_probability', bloom.false_positive_probability)
print('hash_count: ', bloom.hash_count)
for item in word_present:
bloom.add(item)
shuffle(word_present)
shuffle(word_absent)
random_list = word_present[:5] + word_absent[:5]
shuffle(random_list)
for word in random_list:
print('word: ', word)
if bloom.check(word):
if word in word_absent:
print('false positive')
else:
print('word most likely member')
else:
print('word not present')
def test_exercise_4(self):
last_block_hex = '000000000d65610b5af03d73ed67704713c9b734d87cf4b970d39a0416dd80f9'
last_block = bytes.fromhex(last_block_hex)
secret = little_endian_to_int(
hash256(b'Jimmy Song Programming Blockchain'))
private_key = PrivateKey(secret=secret)
addr = private_key.point.address(testnet=True)
h160 = decode_base58(addr)
target_address = 'mwJn1YPMq7y5F8J3LkC5Hxg9PHyZ5K4cFv'
self.assertEqual(addr, target_address)
filter_size = 30
filter_num_functions = 5
filter_tweak = 90210 # FILL THIS IN
target_h160 = decode_base58(target_address)
target_script = p2pkh_script(target_h160)
fee = 5000 # fee in satoshis
node = SimpleNode('tbtc.programmingblockchain.com',
testnet=True,
logging=False)
bf = BloomFilter(filter_size, filter_num_functions, filter_tweak)
bf.add(h160)
node.handshake()
node.send(b'filterload', bf.filterload())
getheaders_message = GetHeadersMessage(start_block=last_block)
node.send(getheaders_message.command, getheaders_message.serialize())
headers_envelope = node.wait_for_commands([HeadersMessage.command])
stream = headers_envelope.stream()
headers = HeadersMessage.parse(stream)
get_data_message = GetDataMessage()
for block in headers.blocks:
self.assertTrue(block.check_pow())
if last_block is not None:
self.assertEqual(block.prev_block, last_block)
last_block = block.hash()
get_data_message.add_data(FILTERED_BLOCK_DATA_TYPE, last_block)
node.send(get_data_message.command, get_data_message.serialize())
prev_tx = None
while prev_tx is None:
envelope = node.wait_for_commands([b'merkleblock', b'tx'])
stream = envelope.stream()
if envelope.command == b'merkleblock':
mb = MerkleBlock.parse(stream)
self.assertTrue(mb.is_valid())
else:
prev = Tx.parse(stream, testnet=True)
for i, tx_out in enumerate(prev.tx_outs):
if tx_out.script_pubkey.address(testnet=True) == addr:
prev_tx = prev.hash()
prev_index = i
prev_amount = tx_out.amount
break
tx_in = TxIn(prev_tx, prev_index)
output_amount = prev_amount - fee
tx_out = TxOut(output_amount, target_script)
tx_obj = Tx(1, [tx_in], [tx_out], 0, testnet=True)
tx_obj.sign_input(0, private_key)
self.assertEqual(
tx_obj.serialize().hex(),
'010000000194e631abb9e1079ec72a1616a3aa0111c614e65b96a6a4420e2cc6af9e6cc96e000000006a47304402203cc8c56abe1c0dd043afa9eb125dafbebdde2dd4cd7abf0fb1aae0667a22006e02203c95b74d0f0735bbf1b261d36e077515b6939fc088b9d7c1b7030a5e494596330121021cdd761c7eb1c90c0af0a5963e94bf0203176b4662778d32bd6d7ab5d8628b32ffffffff01f8829800000000001976a914ad346f8eb57dee9a37981716e498120ae80e44f788ac00000000'
)
def test_bloom():
data = (str(uuid.uuid1()) for i in range(100000))
filter = BloomFilter(100000, 0.0001)
for item in data:
if not item in filter:
filter.add(item)
print "{name} costs {bytes} bytes.".format(name=sys._getframe().f_code.co_name, bytes=filter.container_size())
def create(cls, path, memtable):
bf = BloomFilter(BF_SIZE, BF_HASH_COUNT)
with kv_writer(path) as writer:
for key, value in memtable.entries():
writer.write_entry(key, value)
bf.add(key)
return cls(path, bf)
def test_exercise_6(self):
last_block_hex = '000000000d65610b5af03d73ed67704713c9b734d87cf4b970d39a0416dd80f9'
secret = little_endian_to_int(
hash256(b'Jimmy Song Programming Blockchain'))
private_key = PrivateKey(secret=secret)
addr = private_key.point.address(testnet=True)
h160 = decode_base58(addr)
target_address = 'mwJn1YPMq7y5F8J3LkC5Hxg9PHyZ5K4cFv'
self.assertEqual(addr, target_address)
target_h160 = decode_base58(target_address)
target_script = p2pkh_script(target_h160)
fee = 5000
node = SimpleNode('tbtc.programmingblockchain.com', testnet=True)
bf = BloomFilter(30, 5, 90210)
bf.add(h160)
node.handshake()
node.send(bf.filterload())
start_block = bytes.fromhex(last_block_hex)
getheaders = GetHeadersMessage(start_block=start_block)
node.send(getheaders)
headers = node.wait_for(HeadersMessage)
last_block = None
getdata = GetDataMessage()
for b in headers.blocks:
if not b.check_pow():
raise RuntimeError('proof of work is invalid')
if last_block is not None and b.prev_block != last_block:
raise RuntimeError('chain broken')
getdata.add_data(FILTERED_BLOCK_DATA_TYPE, b.hash())
last_block = b.hash()
node.send(getdata)
prev_tx, prev_index, prev_tx_obj = None, None, None
while prev_tx is None:
message = node.wait_for(MerkleBlock, Tx)
if message.command == b'merkleblock':
if not message.is_valid():
raise RuntimeError('invalid merkle proof')
else:
message.testnet = True
for i, tx_out in enumerate(message.tx_outs):
if tx_out.script_pubkey.address(testnet=True) == addr:
prev_tx = message.hash()
prev_index = i
prev_amount = tx_out.amount
self.assertEqual(
message.id(),
'6ec96c9eafc62c0e42a4a6965be614c61101aaa316162ac79e07e1b9ab31e694'
)
self.assertEqual(i, 0)
break
tx_in = TxIn(prev_tx, prev_index)
output_amount = prev_amount - fee
tx_out = TxOut(output_amount, target_script)
tx_obj = Tx(1, [tx_in], [tx_out], 0, testnet=True)
tx_obj.sign_input(0, private_key)
self.assertEqual(
tx_obj.serialize().hex(),
'010000000194e631abb9e1079ec72a1616a3aa0111c614e65b96a6a4420e2cc6af9e6cc96e000000006a47304402203cc8c56abe1c0dd043afa9eb125dafbebdde2dd4cd7abf0fb1aae0667a22006e02203c95b74d0f0735bbf1b261d36e077515b6939fc088b9d7c1b7030a5e494596330121021cdd761c7eb1c90c0af0a5963e94bf0203176b4662778d32bd6d7ab5d8628b32ffffffff01f8829800000000001976a914ad346f8eb57dee9a37981716e498120ae80e44f788ac00000000'
)
def test_bloomfilter(self):
bloom = BloomFilter(100)
for i in xrange(50):
bloom.add(str(i))
assert "20" in bloom
assert "25" in bloom
assert "49" in bloom
assert "50" not in bloom
def test_bloomfilter(self):
bloom = BloomFilter(100)
for i in xrange(50):
bloom.add(str(i))
assert "20" in bloom
assert "25" in bloom
assert "49" in bloom
assert "50" not in bloom
def test():
bf = BloomFilter(num_hashes=10, size_bytes=100)
bf.add('hello')
s = pickle.dumps(bf)
bf2 = pickle.loads(s)
assert 'hi' not in bf2
assert 'hello' in bf2
assert (bf.seeds == bf2.seeds).all()
def test_excluded(self):
bf = BloomFilter()
bf.add('t1')
bf.add('t2')
test1 = bf.test("t3")
test2 = bf.test("t4")
test3 = bf.test("t5")
# making few checks to eliminate test failings on false positives
self.assertFalse(test1 and test2 and test3)
def write_bloom_filter():
bloomf = BloomFilter(n, p)
print("Size of bit array:{}".format(bloomf.size))
print("False positive Probability:{}".format(bloomf.fp_prob))
print("Number of hash functions:{}".format(bloomf.hash_count))
for item in word_present:
bloomf.add(item)
with open(filename, "wb") as outfile:
outfile.write(bloomf.prepare_bloom_filter_to_write())
def create_bloomfilter_file(self):
bloomf = BloomFilter(self.unique_word_count,
self.false_positive_probability)
try:
for word in self.ta_words_unique:
bloomf.add(word)
bloomf.writetofile(self.bloom_file_path)
except Exception as e:
track = traceback.format_exc()
print(track)
def create_csv_bloomfilter_files(self):
items_count = len(self.dict_tamil_word)
falsepositive_probability = 0.001
bloomf = BloomFilter(items_count, falsepositive_probability)
with open(self.csv_file_path, "w") as f:
for word, count in self.dict_tamil_word.items():
write_line = word + "," + str(count) + os.linesep
bloomf.add(word)
f.write(write_line)
bloomf.writetofile(self.bloomfilter_file_path)
def test_get_filtered_txs(self):
from bloomfilter import BloomFilter
bf = BloomFilter(30, 5, 90210)
h160 = decode_base58('mseRGXB89UTFVkWJhTRTzzZ9Ujj4ZPbGK5')
bf.add(h160)
node = SimpleNode('tbtc.programmingblockchain.com', testnet=True)
node.handshake()
node.send(bf.filterload())
block_hash = bytes.fromhex('00000000000377db7fde98411876c53e318a395af7304de298fd47b7c549d125')
txs = node.get_filtered_txs([block_hash])
self.assertEqual(txs[0].id(), '0c024b9d3aa2ae8faae96603b8d40c88df2fc6bf50b3f446295206f70f3cf6ad')
self.assertEqual(txs[1].id(), '0886537e27969a12478e0d33707bf6b9fe4fdaec8d5d471b5304453b04135e7e')
self.assertEqual(txs[2].id(), '23d4effc88b80fb7dbcc2e6a0b0af9821c6fe3bb4c8dc3b61bcab7c45f0f6888')
def test_bloom_filter(num_of_items, fp_prob):
bloomf = BloomFilter(num_of_items,fp_prob)
# words to be added
word_present = ['abound','abounds','abundance','abundant','accessable',
'bloom','blossom','bolster','bonny','bonus','bonuses',
'coherent','cohesive','colorful','comely','comfort',
'gems','generosity','generous','generously','genial']
# word not added
word_absent = ['bluff','cheater','hate','war','humanity',
'racism','hurt','nuke','gloomy','facebook',
'geeksforgeeks','twitter']
top_passwords_last_years = ['123456', '123456789', 'qwerty', 'password',
'football', '1234567', '12345678', 'letmein',
'1234', '1234567890', 'dragon', 'baseball',
'sunshine', 'iloveyou','trustno1', 'princess',
'adobe123', '123123', 'welcome', 'login', 'admin',
'111111', 'qwerty123', 'solo', '1q2w3e4r', 'master',
'abc123', '666666', 'photoshop', '1qaz2wsx', 'qwertyuiop',
'ashley', 'mustang', '121212', 'starwars', '654321',
'bailey', 'access', 'flower', '555555', 'passw0rd',
'monkey', 'lovely', 'shadow', '7777777', '12345', 'michael',
'!@#$%^&*', 'jesus', 'password1', 'superman', 'hello',
'charlie', '888888', '696969', 'hottie', 'freedom', 'aa123456',
'qazwsx', 'ninja', 'azerty', 'loveme', 'whatever', 'donald',
'batman', 'zaq1zaq1', 'Football', '0', '123qwe', '1111111',
'12345', '000000', '1234', '1q2w3e4r5t', '123', '987654321',
'12345679', 'mynoob', '123321', '18atcskd2w', '3rjs1la7qe',
'google', 'zxcvbnm', '1q2w3e', ]
for item in word_present:
bloomf.add(item)
shuffle(word_present)
shuffle(word_absent)
test_words = word_present[:10] + word_absent
shuffle(test_words)
for word in test_words:
if bloomf.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 build_index(self, document_identifier, kpriv, list_of_words):
# Create an empty list to hold the trapdoors for the word (x1, x2, ..., xr)
trapdoor = []
# Create an empty list to hold the codewords for the word (y1, y2, ..., yr)
codewords = []
for word in list_of_words:
'''
Create a trapdoor for each unique word
'''
# Takes the word and creates a trapdoor
for i in range(0,self.r):
# Converts kpriv[i] from hex to a bytes object - Necessary to use HMAC
key = bytes.fromhex(kpriv[i])
w = bytes(word, 'utf-8')
trapdoor_digest = hmac.new(key, msg=w, digestmod=hashlib.sha1)
trapdoor_digest = trapdoor_digest.hexdigest()
trapdoor.append(trapdoor_digest)
# Take each word and hash it again with the document_identifier as the key to generate y1, y2, ..., yr
for i in range(0, len(trapdoor)):
# encode the docunemt identifier and the trapdoor[i]
d_id = bytes(document_identifier, 'utf-8')
message = bytes(trapdoor[i], 'utf-8')
codeword_digest = hmac.new(message, msg=d_id, digestmod=hashlib.sha1)
codeword_digest = codeword_digest.hexdigest()
codewords.append(codeword_digest)
#Create a bloom filter and insert the codewords into the bloom filter
# Creates a bloom filter
bf = BloomFilter()
# For each value in the list of codewords, add the codeword to the bloom filter
for codeword in codewords:
bf.add(codeword)
# adding noise - take the total number of words - unique words * r and insert into bloom filter
for i in range (0, (self.unique_word_count - len(list_of_words)) * self.r):
# generate a random number from 0 - bf.size
index = random.randrange(0, bf.size-1)
bf.set_index(index)
return(document_identifier, bf)
class CreateBloomFilter():
def __init__(self):
self.cc = ConnectToCassandra()
self.n, self.word_present = self.cc.get_id() #no of items to add
self.p = 0.05 #false positive probability
self.bloomf = BloomFilter(self.n, self.p)
for item in self.word_present:
self.bloomf.add(bytes(to_integer(item.date())))
def createfilter(self):
for item in self.word_present:
self.bloomf.add(bytes(to_integer(item)))
def testdate(self, todate):
todate = to_integer(todate)
if self.bloomf.check(bytes(todate)):
return 1
else:
return 0
def encryptData(data,size,fp=0.01,bigrams=2,bpower=8,p=None):
"""
Criptografa um string
bigrams : 2 = Bigrams
size : Size of BF
fp : False positive rate
"""
bloomfilter = BloomFilter(size,fp,bfpower=bpower)
if p != None:
bloomfilter.set_hashfunction_by_p(p)
index = ngram.NGram(N=bigrams)
bigrams = list(index.ngrams(index.pad(str(data))))
for bigram in bigrams:
bloomfilter.add(str(bigram))
return bloomfilter
class Document:
def __init__(self, terms, doc_id):
self.id = doc_id
self.terms = terms
self.terms = tokenize_terms(self.terms)
self.signature = BloomFilter()
self.signature.add(self.terms)
def verify(self, query):
if isinstance(query, str):
if query not in self.terms:
return False
elif isinstance(query, list):
for term in query:
if term not in self.terms:
return False
else:
return False
return True
def test_example_5(self):
last_block_hex = '00000000000538d5c2246336644f9a4956551afb44ba47278759ec55ea912e19'
address = 'mwJn1YPMq7y5F8J3LkC5Hxg9PHyZ5K4cFv'
h160 = decode_base58(address)
node = SimpleNode('tbtc.programmingblockchain.com',
testnet=True,
logging=False)
bf = BloomFilter(30, 5, 90210)
bf.add(h160)
node.handshake()
node.send(b'filterload', bf.filterload())
start_block = bytes.fromhex(last_block_hex)
getheaders_message = GetHeadersMessage(start_block=start_block)
node.send(b'getheaders', getheaders_message.serialize())
headers_envelope = node.wait_for_commands({b'headers'})
stream = headers_envelope.stream()
headers = HeadersMessage.parse(stream)
get_data_message = GetDataMessage()
for b in headers.blocks:
if not b.check_pow():
raise RuntimeError('proof of work is invalid')
get_data_message.add_data(FILTERED_BLOCK_DATA_TYPE, b.hash())
node.send(b'getdata', get_data_message.serialize())
found = False
while not found:
envelope = node.wait_for_commands({b'merkleblock', b'tx'})
stream = envelope.stream()
if envelope.command == b'merkleblock':
mb = MerkleBlock.parse(stream)
if not mb.is_valid():
raise RuntimeError('invalid merkle proof')
else:
prev_tx_obj = Tx.parse(stream, testnet=True)
for i, tx_out in enumerate(prev_tx_obj.tx_outs):
if tx_out.script_pubkey.address(testnet=True) == address:
self.assertEqual(
prev_tx_obj.id(),
'e3930e1e566ca9b75d53b0eb9acb7607f547e1182d1d22bd4b661cfe18dcddf1'
)
self.assertEqual(i, 0)
found = True
break
def bloom(word_present):
n = 20 #no of items to add
p = 0.05 #false positive probability
bloomf = BloomFilter(n, p)
print("Size of bit array:{}".format(bloomf.size))
print("False positive Probability:{}".format(bloomf.fp_prob))
print("Number of hash functions:{}".format(bloomf.hash_count))
role = [
'Financial analyst', 'Jr. Maintenance Engineer', 'Marketing manager',
'Quantitative analyst', 'Sales Consultant', 'Sales Executive',
'Sales Representative', 'Sr. Software engineer', 'Sr. Software tester',
'Technical support', 'Web developer', 'Jr. Software engineer',
'Jr. Software tester', 'Sr. Maintenance Engineer'
]
# words to be added
#word_present = ['abound','abounds','abundance','abundant','accessable',
# 'bloom','blossom','bolster','bonny','bonus','bonuses',
# 'coherent','cohesive','colorful','comely','comfort',
# 'gems','generosity','generous','generously','genial']
# word not added
word_absent = []
for i in role:
if i not in word_present:
word_absent.append(i)
for item in word_present:
bloomf.add(item)
shuffle(word_present)
shuffle(word_absent)
print word_present
for word in word_present:
print word
if bloomf.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))
class DuplicatesPipeline(object):
def __init__(self):
# self.bf = BloomFilter(10000000, 0.01, 'filter.bloom')
self.bf = BloomFilter(10000, 0.0001, 'filter.bloom')
self.f_write = open('visitedsites','w')
self.si = SearchIndex()
self.si.SearchInit()
self.count_num = 0
def process_item(self, item, spider):
# print '************%d pages visited!*****************' %len(self.bf)
temp='?'
str1=item['url']
str2=str1[:str1.find(temp)]
# if self.bf.add(item['url']):#True if item in the BF
# if self.bf.lookup(item['url']):
if self.bf.lookup(str2):
raise DropItem("Duplicate item found: %s" % item)
else:
# print '%d pages visited!'% len(self.url_seen)
self.count_num+=1
# self.bf.add(item['url'])
# self.save_to_file(item['url'],item['title'])
self.bf.add(str2)
self.save_to_file(item['url'],item['title'])
self.si.AddIndex(item)
print self.count_num
return item
def save_to_file(self,url,utitle):
self.f_write.write(url)
self.f_write.write('\t')
self.f_write.write(utitle.encode('utf-8'))
self.f_write.write('\n')
def __del__(self):
"""docstring for __del__"""
self.f_write.close()
self.si.IndexDone()
def dblookuptimetest():
print("Testing DB lookup time using bloom filter\n")
bf = BloomFilter(500000, 7)
huge = []
lines = open("/usr/share/dict/american-english").read().splitlines()
for line in lines:
bf.add(line)
huge.append(line)
import datetime
start = datetime.datetime.now()
bf.contains("google")
finish = datetime.datetime.now()
print('Checking "google" using bloom filter in dictionary\n')
print((finish - start).microseconds)
start = datetime.datetime.now()
for word in huge:
if word == "google":
break
finish = datetime.datetime.now()
print('Checking "google" without using bloom filter in dictionary\n')
print((finish - start).microseconds)
print(bf.contains("Max"))
print(bf.contains("mice"))
print(bf.contains("3"))
start = datetime.datetime.now()
bf.contains("apple")
finish = datetime.datetime.now()
print((finish - start).microseconds)
start = datetime.datetime.now()
for word in huge:
if word == "apple":
break
finish = datetime.datetime.now()
print((finish - start).microseconds)
class SSTable:
"""Represents a Sorted-String-Table (SSTable) on disk"""
def __init__(self, path, bf=None):
self.path = path
self.bf = bf
if not self.bf:
self._sync()
def _sync(self):
self.bf = BloomFilter(BF_SIZE, BF_HASH_COUNT)
with kv_reader(self.path) as r:
while r.has_next():
key = r.read_key()
self.bf.add(key)
r.skip_value()
@classmethod
def create(cls, path, memtable):
bf = BloomFilter(BF_SIZE, BF_HASH_COUNT)
with kv_writer(path) as writer:
for key, value in memtable.entries():
writer.write_entry(key, value)
bf.add(key)
return cls(path, bf)
def search(self, search_key):
if not self.bf.exists(search_key):
return None
with kv_reader(self.path) as r:
while r.has_next():
key = r.read_key()
# stop if the key is too big
if key > search_key:
return None
if key == search_key:
return r.read_value()
r.skip_value()
return None
def merge(cls, sstables: List[SSTable]) -> SSTable:
new_path = sstables[0].path.replace(".dat", "-compacted.dat")
new_index = sstables[0].index
new_bf = BloomFilter(BF_SIZE, BF_HASH_COUNT)
readers = [cls.Entries(sstable) for sstable in sstables
if sstable.size > 0]
with kv_writer(new_path) as writer:
while readers:
min_reader = min(
readers,
key=lambda r: (r.current_pair[0], r.sstable.index * -1),
)
for reader in readers:
if reader is min_reader:
continue
if reader.current_pair[0] == min_reader.current_pair[0]:
reader.advance()
if min_reader.current_pair[1] is not TOMBSTONE:
writer.write_entry(*min_reader.current_pair)
new_bf.add(min_reader.current_pair[0])
min_reader.advance()
readers = [reader for reader in readers if reader.has_next]
return cls(new_path, new_index, new_bf)
def main():
m = 1000000 # max hash value
h = 2000 # number of hash functions
jaccard = 0.8
N = np.linspace(10, 10**3, num=10).astype('int')
jaccard_minhash = []
jaccard_bloom = []
jaccard_true = []
for n in N:
d1 = set([str(x) for x in range(n)])
min_d2 = int(n*(1.-jaccard)/(1. + jaccard))
d2 = set([str(x) for x in range(min_d2, min_d2 + n)])
b1 = BloomFilter(m, h)
b2 = BloomFilter(m, h)
mh1 = MinHash(h)
mh2 = MinHash(h)
for s1, s2 in izip(d1, d2):
b1.add(s1)
b2.add(s2)
mh1.hash(d1)
mh2.hash(d2)
jaccard_minhash.append(1.-hamming(mh1.vec, mh2.vec))
jaccard_bloom.append(1-2*float(sum(np.not_equal(b1.bit_array, b2.bit_array)))/(sum(b1.bit_array) + sum(b2.bit_array)))
jaccard_true.append(float(len(d1.intersection(d2)))/len(d1.union(d2)))
plt.plot(N, np.array([jaccard_bloom, jaccard_minhash, jaccard_true]).T)
plt.legend(['Bloom Filter', 'MinHash', 'True'], loc='upper left')
plt.xlabel('Number of strings')
plt.ylabel('Jaccard Coefficient')
plt.title('Jaccard Approximation Through Hashing')
plt.show()
def test_bloom_filter():
bloomfilter = BloomFilter(NUM_KEYS, FALSE_POSITIVE_PROBABILITY)
word_present = [
'abound', 'abounds', 'abundance', 'abundant', 'accessable', 'bloom',
'blossom', 'bolster', 'bonny', 'bonus', 'bonuses', 'coherent',
'cohesive', 'colorful', 'comely', 'comfort', 'gems', 'generosity',
'generous', 'generously', 'genial'
]
word_absent = ['facebook', 'twitter']
for item in word_present:
bloomfilter.add(item)
test_words = word_present[:10] + word_absent
shuffle(test_words)
for word in test_words:
if bloomfilter.is_member(word):
if word in word_absent:
print(f"'{word}' is a false positive!")
else:
print(f"'{word}' is probably present!")
else:
print(f"'{word}' is definitely not present!")
class CreateBloomFilter():
def __init__(self, cnt, word_present):
self.n = cnt
self.word_present = word_present #no of items to add
self.p = 0.05 #false positive probability
self.bloomf = BloomFilter(self.n, self.p)
for item in self.word_present:
print(item)
self.bloomf.add(
bytes(to_integer(datetime.datetime.strptime(item, '%Y%m%d'))))
def createfilter(self, cnt, word_present):
self.p = 0.05 #false positive probability
self.bloomf = BloomFilter(cnt, self.p)
for item in word_present:
self.bloomf.add(bytes(to_integer(item)))
def testdate(self, todate):
todate = datetime.datetime.strptime(todate, '%Y%m%d')
todate = to_integer(todate)
if self.bloomf.check(bytes(todate)):
return 1
else:
return 0
word_present = []
inFile = open("/Users/siddhartharoynandi/Desktop/listed_username_30.txt")
for line in inFile:
word_present.append(line)
n = len(word_present) # no of items to add
p = 0.05 # false positive probability
bloomf = BloomFilter(n, p)
#print("Size of bit array:{}".format(bloomf.size))
#print("False positive Probability:{}".format(bloomf.fp_prob))
#print("Number of hash functions:{}".format(bloomf.hash_count))
for item in word_present:
bloomf.add(item)
word_tobe_tested = []
inFile = open("/Users/siddhartharoynandi/Desktop/listed_username_365.txt")
for line in inFile:
word_tobe_tested.append(line)
shuffle(word_present)
shuffle(word_tobe_tested)
count = 0
count1 = 0
for word in word_tobe_tested:
if bloomf.check(word):
count1 = count1 + 1
)
except: # invalid data or mistake
pass
filter_visual_window.close()
pass
except:
pass
elif event == 'Insert new password':
try:
if len(values['-NEW-PASSWORD-']) != 0:
if bloomf.check_if_add(values['-NEW-PASSWORD-']):
sg.PopupError("inserted not successfully This word[ " +
str(values['-NEW-PASSWORD-']) +
" ] in bloom filter , Try Again!")
else:
bloomf.add(values['-NEW-PASSWORD-'])
sg.PopupOK(
"The password has been inserted successfully [ we Found overlap "
+ str(bloomf.c) + "bits]")
if bloomf.c == sizeofhashs:
sg.popup_ok("ohh ! , we Found False positive ")
false_positive += 1
else:
sg.PopupError(
"inserted not successfully Null input, Try Again!")
except:
pass
elif event == 'Show complete password strength analysis':
try:
if len(values['-NEW-PASSWORD-']) == 0:
sg.popup_error("Null input :(")
#address = 'mwJn1YPMq7y5F8J3LkC5Hxg9PHyZ5K4cFv'
# our test
#last_block_hex = '0000000017e6fbd8931bce659d45d92040a4674950f2ae5416d0bf1a239641f9'
last_block_hex = '00000000970369111c044804ec0319792c9e1aa29f59a622c5d14b3544ae4eba'
#0000000017e6fbd8931bce659d45d92040a4674950f2ae5416d0bf1a239641f9
#last_block_hex = '0000000000000004fea90996fdf40772e2c2c76205a1fb57fae465194fdaffb9'
address = 'mvEg6eZ3sUApodedYQrkpEPMMALsr1K1k1'
h160 = decode_base58(address)
node = SimpleNode('testnet.programmingbitcoin.com',
testnet=True,
logging=False)
bf = BloomFilter(size=30, function_count=5, tweak=90210)
bf.add(h160)
node.handshake()
node.send(bf.filterload())
start_block = bytes.fromhex(last_block_hex)
getheaders = GetHeadersMessage(start_block=start_block)
node.send(getheaders)
print('ok2')
headers = node.wait_for(HeadersMessage)
print('ok3')
getdata = GetDataMessage()
for b in headers.blocks:
if not b.check_pow():
raise RuntimeError('proof of work is invalid')
getdata.add_data(FILTERED_BLOCK_DATA_TYPE, b.hash())
node.send(getdata)
found = False
if __name__ == '__main__':
from random import sample
from string import ascii_letters
states = '''Alabama Alaska Arizona Arkansas California Colorado Connecticut
Delaware Florida Georgia Hawaii Idaho Illinois Indiana Iowa Kansas
Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota
Mississippi Missouri Montana Nebraska Nevada NewHampshire NewJersey
NewMexico NewYork NorthCarolina NorthDakota Ohio Oklahoma Oregon
Pennsylvania RhodeIsland SouthCarolina SouthDakota Tennessee Texas Utah
Vermont Virginia Washington WestVirginia Wisconsin Wyoming'''.split()
bf1 = BloomFilter(ideal_num_elements_n=100000, error_rate_p=0.001)
for state in states:
bf1.add(state)
json_bf = bf1.toJSON()
print "##################"
print json_bf
print "##################"
len_json = len(json_bf)
print "data size: %s bytes"%len_json
bf2 = BloomFilter.fromJSON(json_bf)
assertListEquals(bf1.data, bf2.data)
new_data = bf2.get_data()
