Source code for octavia.common.utils

# Copyright 2011, VMware, Inc., 2014 A10 Networks
# All Rights Reserved.
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
#    under the License.
# Borrowed from nova code base, more utilities will be added/borrowed as and
# when needed.

"""Utilities and helper functions."""

import base64
import hashlib
import ipaddress
import re
import socket

from oslo_config import cfg
from oslo_log import log as logging
from oslo_utils import excutils
from stevedore import driver as stevedore_driver

from octavia.common import constants


LOG = logging.getLogger(__name__)

[docs]def get_hostname(): return socket.gethostname()
[docs]def base64_sha1_string(string_to_hash): """Get a b64-encoded sha1 hash of a string. Not intended to be secure!""" # TODO(rm_work): applying nosec here because this is not intended to be # secure, it's just a way to get a consistent ID. Changing this would # break backwards compatibility with existing loadbalancers. hash_str = hashlib.sha1(string_to_hash.encode('utf-8')).digest() # nosec b64_str = base64.b64encode(hash_str, str.encode('_-', 'ascii')) b64_sha1 = b64_str.decode('UTF-8') # return re.sub(r"^-", "x", b64_sha1)
[docs]def get_amphora_driver(): amphora_driver = stevedore_driver.DriverManager( namespace='octavia.amphora.drivers', name=CONF.controller_worker.amphora_driver, invoke_on_load=True ).driver return amphora_driver
[docs]def get_network_driver(): CONF.import_group('controller_worker', 'octavia.common.config') network_driver = stevedore_driver.DriverManager( namespace='', name=CONF.controller_worker.network_driver, invoke_on_load=True ).driver return network_driver
[docs]def ip_version(ip_address): ip = ipaddress.ip_address(ip_address) return ip.version
[docs]def is_ipv4(ip_address): """Check if ip address is IPv4 address.""" ip = ipaddress.ip_address(ip_address) return ip.version == 4
[docs]def is_ipv6(ip_address): """Check if ip address is IPv6 address.""" ip = ipaddress.ip_address(ip_address) return ip.version == 6
[docs]def is_cidr_ipv6(cidr): """Check if CIDR is IPv6 address with subnet prefix.""" ip = ipaddress.ip_network(cidr, strict=False) return ip.version == 6
[docs]def is_ipv6_lla(ip_address): """Check if ip address is IPv6 link local address.""" ip = ipaddress.ip_address(ip_address) return ip.version == 6 and ip.is_link_local
[docs]def ip_port_str(ip_address, port): """Return IP port as string representation depending on address family.""" ip = ipaddress.ip_address(ip_address) if ip.version == 4: return "{ip}:{port}".format(ip=ip, port=port) return "[{ip}]:{port}".format(ip=ip, port=port)
[docs]def netmask_to_prefix(netmask): return ipaddress.ip_network(f'{netmask}', strict=False).prefixlen
[docs]def ip_netmask_to_cidr(ip, netmask): return ipaddress.ip_network(f'{ip}/{netmask}', strict=False).with_prefixlen
[docs]def get_vip_security_group_name(loadbalancer_id): if loadbalancer_id: return constants.VIP_SECURITY_GROUP_PREFIX + loadbalancer_id return None
[docs]def get_compatible_value(value): if isinstance(value, str): value = value.encode('utf-8') return value
[docs]def get_compatible_server_certs_key_passphrase(): key = CONF.certificates.server_certs_key_passphrase if isinstance(key, str): key = key.encode('utf-8') return base64.urlsafe_b64encode(key)
[docs]def subnet_ip_availability(nw_ip_avail, subnet_id, req_num_ips): for subnet in nw_ip_avail.subnet_ip_availability: if subnet['subnet_id'] == subnet_id: return subnet['total_ips'] - subnet['used_ips'] >= req_num_ips return None
[docs]def b(s): return s.encode('utf-8')
[docs]def expand_expected_codes(codes): """Expand the expected code string in set of codes. 200-204 -> 200, 201, 202, 204 200, 203 -> 200, 203 """ retval = set() codes = re.split(', *', codes) for code in codes: if not code: continue if '-' in code: low, hi = code.split('-')[:2] retval.update( str(i) for i in range(int(low), int(hi) + 1)) else: retval.add(code) return retval
[docs]class exception_logger(object): """Wrap a function and log raised exception :param logger: the logger to log the exception default is LOG.exception :returns: origin value if no exception raised; re-raise the exception if any occurred """ def __init__(self, logger=None): self.logger = logger def __call__(self, func): if self.logger is None: _LOG = logging.getLogger(func.__module__) self.logger = _LOG.exception def call(*args, **kwargs): try: return func(*args, **kwargs) except Exception as e: with excutils.save_and_reraise_exception(): self.logger(e) return None return call