def test_get_addresses_failing_when_expired_in_cache(self, cache_logger):
self.getaddrinfo.return_value = [(2, 1, 6, '', ('127.0.0.1', 0)),
(2, 2, 17, '', ('127.0.0.1', 0)),
(2, 3, 0, '', ('127.0.0.1', 0)),
(2, 1, 6, '', ('10.237.214.247', 0)),
(2, 2, 17, '', ('10.237.214.247', 0)),
(2, 3, 0, '', ('10.237.214.247', 0))]
# Given valid result is in chache but expired
utils.get_addresses_by_name('some_host_name')
self.clock.return_value = 1.0e6
# Given addresses resolution is now failing
given_error = RuntimeError("This is top secret.")
def failing_getaddrinfo(name, service):
raise given_error
self.getaddrinfo.side_effect = failing_getaddrinfo
self.assertRaises(RuntimeError, utils.get_addresses_by_name,
'some_host_name')
# Then result is fetched more times
self.getaddrinfo.assert_has_calls([
mock.call('some_host_name', None),
mock.call('some_host_name', None)
])
cache_logger.warning.assert_called_once_with(
'Error fetching values for keys: %r',
"'some_host_name'",
exc_info=(RuntimeError, given_error, mock.ANY))
def test_get_addresses_by_valid_name_when_cache_expires(self):
self.getaddrinfo.return_value = [(2, 1, 6, '', ('127.0.0.1', 0)),
(2, 2, 17, '', ('127.0.0.1', 0)),
(2, 3, 0, '', ('127.0.0.1', 0)),
(2, 1, 6, '', ('10.237.214.247', 0)),
(2, 2, 17, '', ('10.237.214.247', 0)),
(2, 3, 0, '', ('10.237.214.247', 0))]
# When valid host name is requested
result1 = utils.get_addresses_by_name('some_host_name')
# and after a long time
self.clock.return_value = 1.0e6
# When valid host name is requested
result2 = utils.get_addresses_by_name('some_host_name')
# Then correct addresses are returned
self.assertEqual(('127.0.0.1', '10.237.214.247'), result1)
self.assertEqual(('127.0.0.1', '10.237.214.247'), result2)
# Then addresses are fetched twice
self.getaddrinfo.assert_has_calls([
mock.call('some_host_name', None),
mock.call('some_host_name', None)
])
def test_get_addresses_by_valid_name_when_cache_expires(self):
self.getaddrinfo.return_value = [
(2, 1, 6, '', ('127.0.0.1', 0)),
(2, 2, 17, '', ('127.0.0.1', 0)),
(2, 3, 0, '', ('127.0.0.1', 0)),
(2, 1, 6, '', ('10.237.214.247', 0)),
(2, 2, 17, '', ('10.237.214.247', 0)),
(2, 3, 0, '', ('10.237.214.247', 0))]
# When valid host name is requested
result1 = utils.get_addresses_by_name('some_host_name')
# and after a long time
self.clock.return_value = 1.0e6
# When valid host name is requested
result2 = utils.get_addresses_by_name('some_host_name')
# Then correct addresses are returned
self.assertEqual(('127.0.0.1', '10.237.214.247'), result1)
self.assertEqual(('127.0.0.1', '10.237.214.247'), result2)
# Then addresses are fetched twice
self.getaddrinfo.assert_has_calls(
[mock.call('some_host_name', None),
mock.call('some_host_name', None)])
def test_get_addresses_failing_when_expired_in_cache(self, cache_logger):
self.getaddrinfo.return_value = [
(2, 1, 6, '', ('127.0.0.1', 0)),
(2, 2, 17, '', ('127.0.0.1', 0)),
(2, 3, 0, '', ('127.0.0.1', 0)),
(2, 1, 6, '', ('10.237.214.247', 0)),
(2, 2, 17, '', ('10.237.214.247', 0)),
(2, 3, 0, '', ('10.237.214.247', 0))]
# Given valid result is in chache but expired
utils.get_addresses_by_name('some_host_name')
self.clock.return_value = 1.0e6
# Given addresses resolution is now failing
given_error = RuntimeError("This is top secret.")
def failing_getaddrinfo(name, service):
raise given_error
self.getaddrinfo.side_effect = failing_getaddrinfo
self.assertRaises(
RuntimeError, utils.get_addresses_by_name, 'some_host_name')
# Then result is fetched more times
self.getaddrinfo.assert_has_calls(
[mock.call('some_host_name', None),
mock.call('some_host_name', None)])
cache_logger.warning.assert_called_once_with(
'Error fetching values for keys: %r', "'some_host_name'",
exc_info=(RuntimeError, given_error, mock.ANY))
def test_get_addresses_by_valid_name(self):
self.getaddrinfo.return_value = [(2, 1, 6, '', ('127.0.0.1', 0)),
(2, 2, 17, '', ('127.0.0.1', 0)),
(2, 3, 0, '', ('127.0.0.1', 0)),
(2, 1, 6, '', ('10.237.214.247', 0)),
(2, 2, 17, '', ('10.237.214.247', 0)),
(2, 3, 0, '', ('10.237.214.247', 0))]
# When valid host name is requested
result = utils.get_addresses_by_name('some_host_name')
# Then correct addresses are returned
self.assertEqual(('127.0.0.1', '10.237.214.247'), result)
# Then fetched addresses are cached
self.assertEqual(result, utils.get_addresses_by_name('some_host_name'))
# Then addresses are fetched only once
self.getaddrinfo.assert_called_once_with('some_host_name', None)
def test_get_addresses_by_valid_name(self):
self.getaddrinfo.return_value = [
(2, 1, 6, '', ('127.0.0.1', 0)),
(2, 2, 17, '', ('127.0.0.1', 0)),
(2, 3, 0, '', ('127.0.0.1', 0)),
(2, 1, 6, '', ('10.237.214.247', 0)),
(2, 2, 17, '', ('10.237.214.247', 0)),
(2, 3, 0, '', ('10.237.214.247', 0))]
# When valid host name is requested
result = utils.get_addresses_by_name('some_host_name')
# Then correct addresses are returned
self.assertEqual(('127.0.0.1', '10.237.214.247'), result)
# Then fetched addresses are cached
self.assertEqual(result, utils.get_addresses_by_name('some_host_name'))
# Then addresses are fetched only once
self.getaddrinfo.assert_called_once_with('some_host_name', None)
def _fetch_elements_by_host(self, host_name, cache_timeout=60.0):
'''Yields all network topology elements referring to given host name
'''
host_addresses = [host_name]
try:
# It uses both compute host name and known IP addresses to
# recognize topology elements valid for given computed host
ip_addresses = utils.get_addresses_by_name(host_name)
except Exception:
ip_addresses = []
LOG.exception(
_LE('Unable to resolve IP addresses for host %(host_name)r'),
{'host_name': host_name})
else:
host_addresses.extend(ip_addresses)
yield_elements = set()
try:
for __, element in self._elements_by_ip.fetch_all(
host_addresses, cache_timeout):
# yields every element only once
if element not in yield_elements:
yield_elements.add(element)
yield element
except cache.CacheFetchError as error:
# This error is expected on most of the cases because typically not
# all host_addresses maps to a network topology element.
if yield_elements:
# As we need only one element for every host we ignore the
# case in which others host addresseses didn't map to any host
LOG.debug(
'Host addresses not found in networking topology: %s',
', '.join(error.missing_keys))
else:
LOG.exception(
_LE('No such network topology elements for given host '
'%(host_name)r and given IPs: %(ip_addresses)s.'), {
'host_name': host_name,
'ip_addresses': ", ".join(ip_addresses)
})
error.reraise_cause()
def _fetch_elements_by_host(self, host_name, cache_timeout=60.0):
'''Yields all network topology elements referring to given host name
'''
host_addresses = [host_name]
try:
# It uses both compute host name and known IP addresses to
# recognize topology elements valid for given computed host
ip_addresses = utils.get_addresses_by_name(host_name)
except Exception:
ip_addresses = []
LOG.exception(
_LE('Unable to resolve IP addresses for host %(host_name)r'),
{'host_name': host_name})
else:
host_addresses.extend(ip_addresses)
yield_elements = set()
try:
for _, element in self._elements_by_ip.fetch_all(
host_addresses, cache_timeout):
# yields every element only once
if element not in yield_elements:
yield_elements.add(element)
yield element
except cache.CacheFetchError as error:
# This error is expected on most of the cases because typically not
# all host_addresses maps to a network topology element.
if yield_elements:
# As we need only one element for every host we ignore the
# case in which others host addresseses didn't map to any host
LOG.debug(
'Host addresses not found in networking topology: %s',
', '.join(error.missing_keys))
else:
LOG.exception(
_LE('No such network topology elements for given host '
'%(host_name)r and given IPs: %(ip_addresses)s.'),
{'host_name': host_name,
'ip_addresses': ", ".join(ip_addresses)})
error.reraise_cause()