def _generate_hostname(pattern, number):
"""Generates hostname based on pattern
Replaces '#' char in pattern with supplied number, if no pattern is
supplied generates short and unique name for the host.
:param pattern: hostname pattern
:param number: number to replace with in pattern
:return: hostname
"""
global _random_string_counter
if pattern:
# NOTE(kzaitsev) works both for unicode and simple strings in py2
# and works as expected in py3
return pattern.replace('#', str(number))
counter = _random_string_counter or 1
# generate first 5 random chars
prefix = ''.join(random.choice(string.ascii_lowercase) for _ in range(5))
# convert timestamp to higher base to shorten hostname string
# (up to 8 chars)
timestamp = helpers.int2base(int(time.time() * 1000), 36)[:8]
# third part of random name up to 2 chars
# (1295 is last 2-digit number in base-36, 1296 is first 3-digit number)
suffix = helpers.int2base(counter, 36)
_random_string_counter = (counter + 1) % 1296
return prefix + timestamp + suffix
def _generate_hostname(pattern, number):
"""Generates hostname based on pattern
Replaces '#' char in pattern with supplied number, if no pattern is
supplied generates short and unique name for the host.
:param pattern: hostname pattern
:param number: number to replace with in pattern
:return: hostname
"""
global _random_string_counter
if pattern:
# NOTE(kzaitsev) works both for unicode and simple strings in py2
# and works as expected in py3
return pattern.replace('#', str(number))
counter = _random_string_counter or 1
# generate first 5 random chars
prefix = ''.join(random.choice(string.ascii_lowercase) for _ in range(5))
# convert timestamp to higher base to shorten hostname string
# (up to 8 chars)
timestamp = helpers.int2base(int(time.time() * 1000), 36)[:8]
# third part of random name up to 2 chars
# (1295 is last 2-digit number in base-36, 1296 is first 3-digit number)
suffix = helpers.int2base(counter, 36)
_random_string_counter = (counter + 1) % 1296
return prefix + timestamp + suffix
def _generate_hostname(pattern, number):
"""Replace '#' char in pattern with supplied number, if no pattern is
supplied generate short and unique name for the host.
:param pattern: hostname pattern
:param number: number to replace with in pattern
:return: hostname
"""
global _random_string_counter
if pattern and isinstance(pattern, types.UnicodeType):
return pattern.replace(u'#', unicode(number))
elif pattern:
return pattern.replace('#', str(number))
counter = _random_string_counter or 1
# generate first 5 random chars
prefix = ''.join(random.choice(string.lowercase) for _ in range(5))
# convert timestamp to higher base to shorten hostname string
# (up to 8 chars)
timestamp = helpers.int2base(int(time.time() * 1000), 36)[:8]
# third part of random name up to 2 chars
# (1295 is last 2-digit number in base-36, 1296 is first 3-digit number)
suffix = helpers.int2base(counter, 36)
_random_string_counter = (counter + 1) % 1296
return prefix + timestamp + suffix
def test_int2base(self):
for x in range(30):
self.assertEqual("{0:b}".format(x), helpers.int2base(x, 2))
self.assertEqual("{0:o}".format(x), helpers.int2base(x, 8))
self.assertEqual("{0:x}".format(x), helpers.int2base(x, 16))
def test_int2base(self):
for x in range(30):
self.assertEqual("{0:b}".format(x), helpers.int2base(x, 2))
self.assertEqual("{0:o}".format(x), helpers.int2base(x, 8))
self.assertEqual("{0:x}".format(x), helpers.int2base(x, 16))