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# Copyright (c) 2014 Red Hat Inc.
# 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
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# 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.
import collections
import socket
from oslo_log import log
from networking_odl.common import cache
LOG = log.getLogger(__name__)
def try_del(d, keys):
"""Ignore key errors when deleting from a dictionary."""
for key in keys:
try:
del d[key]
except KeyError:
pass
def _fetch_all_addresses_by_hostnames(hostnames):
for name in hostnames:
# it uses an ordered dict to avoid duplicates and keep order
entries = collections.OrderedDict(
(info[4][0], None) for info in socket.getaddrinfo(name, None))
for entry in entries:
yield name, entry
_addresses_by_name_cache = cache.Cache(_fetch_all_addresses_by_hostnames)
def get_addresses_by_name(name, time_to_live=60.0):
"""Gets and caches addresses for given name.
This is a cached wrapper for function 'socket.getaddrinfo'.
:returns: a sequence of unique addresses binded to given hostname.
"""
try:
results = _addresses_by_name_cache.fetch_all(
[name], timeout=time_to_live)
return tuple(address for name, address in results)
except cache.CacheFetchError as error:
error.reraise_cause()
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