268 lines
13 KiB
Python
268 lines
13 KiB
Python
# Copyright 2012 OpenStack Foundation
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from oslo_config import cfg
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_DEFAULT_BACKEND = 'dogpile.cache.null'
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FILE_OPTIONS = {
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'cache': [
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cfg.StrOpt('config_prefix', default='cache.oslo',
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help='Prefix for building the configuration dictionary '
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'for the cache region. This should not need to be '
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'changed unless there is another dogpile.cache '
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'region with the same configuration name.'),
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cfg.IntOpt('expiration_time', default=600,
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help='Default TTL, in seconds, for any cached item in '
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'the dogpile.cache region. This applies to any '
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'cached method that doesn\'t have an explicit '
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'cache expiration time defined for it.'),
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# NOTE(morganfainberg): It is recommended that either Redis or
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# Memcached are used as the dogpile backend for real workloads. To
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# prevent issues with the memory cache ending up in "production"
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# unintentionally, we register a no-op as the default caching backend.
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cfg.StrOpt('backend', default=_DEFAULT_BACKEND,
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choices=['oslo_cache.memcache_pool',
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'oslo_cache.dict',
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'oslo_cache.mongo',
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'oslo_cache.etcd3gw',
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'dogpile.cache.pymemcache',
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'dogpile.cache.memcached',
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'dogpile.cache.pylibmc',
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'dogpile.cache.bmemcached',
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'dogpile.cache.dbm',
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'dogpile.cache.redis',
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'dogpile.cache.memory',
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'dogpile.cache.memory_pickle',
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'dogpile.cache.null'],
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help='Cache backend module. For eventlet-based or '
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'environments with hundreds of threaded servers, Memcache '
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'with pooling (oslo_cache.memcache_pool) is recommended. '
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'For environments with less than 100 threaded servers, '
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'Memcached (dogpile.cache.memcached) or Redis '
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'(dogpile.cache.redis) is recommended. Test environments '
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'with a single instance of the server can use the '
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'dogpile.cache.memory backend.'),
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cfg.MultiStrOpt('backend_argument', default=[], secret=True,
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help='Arguments supplied to the backend module. '
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'Specify this option once per argument to be '
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'passed to the dogpile.cache backend. Example '
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'format: "<argname>:<value>".'),
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cfg.ListOpt('proxies', default=[],
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help='Proxy classes to import that will affect the way '
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'the dogpile.cache backend functions. See the '
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'dogpile.cache documentation on '
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'changing-backend-behavior.'),
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cfg.BoolOpt('enabled', default=False,
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help='Global toggle for caching.'),
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cfg.BoolOpt('debug_cache_backend', default=False,
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help='Extra debugging from the cache backend (cache '
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'keys, get/set/delete/etc calls). This is only '
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'really useful if you need to see the specific '
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'cache-backend get/set/delete calls with the '
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'keys/values. Typically this should be left set '
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'to false.'),
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cfg.ListOpt('memcache_servers', default=['localhost:11211'],
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help='Memcache servers in the format of "host:port". '
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'This is used by backends dependent on Memcached.'
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'If ``dogpile.cache.memcached`` or '
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'``oslo_cache.memcache_pool`` is used and a given '
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'host refer to an IPv6 or a given domain refer to '
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'IPv6 then you should prefix the given address with'
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'the address family (``inet6``) '
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'(e.g ``inet6[::1]:11211``, '
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'``inet6:[fd12:3456:789a:1::1]:11211``, '
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'``inet6:[controller-0.internalapi]:11211``). '
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'If the address family is not given then these '
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'backends will use the default ``inet`` address '
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'family which corresponds to IPv4'),
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cfg.IntOpt('memcache_dead_retry',
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default=5 * 60,
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help='Number of seconds memcached server is considered dead'
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' before it is tried again. (dogpile.cache.memcache and'
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' oslo_cache.memcache_pool backends only).'),
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cfg.FloatOpt('memcache_socket_timeout',
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default=1.0,
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help='Timeout in seconds for every call to a server.'
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' (dogpile.cache.memcache and oslo_cache.memcache_pool'
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' backends only).'),
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cfg.IntOpt('memcache_pool_maxsize',
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default=10,
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help='Max total number of open connections to every'
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' memcached server. (oslo_cache.memcache_pool backend'
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' only).'),
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cfg.IntOpt('memcache_pool_unused_timeout',
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default=60,
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help='Number of seconds a connection to memcached is held'
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' unused in the pool before it is closed.'
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' (oslo_cache.memcache_pool backend only).'),
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cfg.IntOpt('memcache_pool_connection_get_timeout',
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default=10,
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help='Number of seconds that an operation will wait to get '
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'a memcache client connection.'),
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cfg.BoolOpt('memcache_pool_flush_on_reconnect',
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default=False,
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help='Global toggle if memcache will be flushed'
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' on reconnect.'
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' (oslo_cache.memcache_pool backend only).'),
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cfg.BoolOpt('memcache_sasl_enabled',
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default=False,
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help='Enable the SASL(Simple Authentication and Security'
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'Layer) if the SASL_enable is true, else disable.'),
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cfg.StrOpt('memcache_username',
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default='',
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help='the user name for the memcached which SASL enabled'),
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cfg.StrOpt('memcache_password',
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default='',
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help='the password for the memcached which SASL enabled'),
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cfg.BoolOpt('tls_enabled',
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default=False,
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help='Global toggle for TLS usage when comunicating with'
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' the caching servers.'),
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cfg.StrOpt('tls_cafile',
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default=None,
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help='Path to a file of concatenated CA certificates in PEM'
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' format necessary to establish the caching servers\''
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' authenticity. If tls_enabled is False, this option is'
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' ignored.'),
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cfg.StrOpt('tls_certfile',
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default=None,
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help='Path to a single file in PEM format containing the'
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' client\'s certificate as well as any number of CA'
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' certificates needed to establish the certificate\'s'
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' authenticity. This file is only required when client side'
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' authentication is necessary. If tls_enabled is False,'
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' this option is ignored.'),
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cfg.StrOpt('tls_keyfile',
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default=None,
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help='Path to a single file containing the client\'s'
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' private key in. Otherwise the private key will be taken'
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' from the file specified in tls_certfile. If tls_enabled'
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' is False, this option is ignored.'),
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cfg.StrOpt('tls_allowed_ciphers',
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default=None,
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help='Set the available ciphers for sockets created with'
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' the TLS context. It should be a string in the OpenSSL'
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' cipher list format. If not specified, all OpenSSL enabled'
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' ciphers will be available.'),
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cfg.BoolOpt(
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'enable_socket_keepalive',
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default=False,
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help="Global toggle for the socket keepalive of "
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"dogpile's pymemcache backend"),
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cfg.IntOpt(
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'socket_keepalive_idle',
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default=1,
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min=0,
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help='The time (in seconds) the connection needs to '
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'remain idle before TCP starts sending keepalive probes. '
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'Should be a positive integer most greater than zero.'),
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cfg.IntOpt(
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'socket_keepalive_interval',
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default=1,
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min=0,
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help='The time (in seconds) between individual keepalive '
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'probes. Should be a positive integer greater '
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'than zero.'),
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cfg.IntOpt(
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'socket_keepalive_count',
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default=1,
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min=0,
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help='The maximum number of keepalive probes TCP should '
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'send before dropping the connection. Should be a '
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'positive integer greater than zero.'),
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cfg.BoolOpt(
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'enable_retry_client',
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default=False,
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help='Enable retry client mechanisms to handle failure. '
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'Those mechanisms can be used to wrap all kind of pymemcache '
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'clients. The wrapper allows you to define how many attempts '
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'to make and how long to wait between attemots.'),
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cfg.IntOpt(
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'retry_attempts',
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min=1,
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default=2,
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help='Number of times to attempt an action before failing.'),
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cfg.FloatOpt(
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'retry_delay',
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default=0,
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help='Number of seconds to sleep between each attempt.'),
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cfg.IntOpt(
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'hashclient_retry_attempts',
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min=1,
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default=2,
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help='Amount of times a client should be tried '
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'before it is marked dead and removed from the pool in '
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'the HashClient\'s internal mechanisms.'),
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cfg.FloatOpt(
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'hashclient_retry_delay',
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default=1,
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help='Time in seconds that should pass between '
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'retry attempts in the HashClient\'s internal mechanisms.'),
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cfg.FloatOpt(
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'dead_timeout',
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default=60,
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help='Time in seconds before attempting to add a node '
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'back in the pool in the HashClient\'s internal mechanisms.'),
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],
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}
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def configure(conf):
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for section in FILE_OPTIONS:
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for option in FILE_OPTIONS[section]:
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conf.register_opt(option, group=section)
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def set_defaults(conf, memcache_pool_flush_on_reconnect=False):
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"""Set defaults for configuration variables.
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Overrides default options values.
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:param conf: Configuration object, managed by the caller.
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:type conf: oslo.config.cfg.ConfigOpts
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:param memcache_pool_flush_on_reconnect: The default state for the
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``flush_on_reconnect`` flag. By default deactivated
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:type memcache_pool_flush_on_reconnect: bool
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"""
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conf.register_opt(FILE_OPTIONS, group='cache')
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cfg.set_defaults(
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FILE_OPTIONS,
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memcache_pool_flush_on_reconnect=memcache_pool_flush_on_reconnect)
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def list_opts():
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"""Return a list of oslo_config options.
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The returned list includes all oslo_config options which are registered as
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the "FILE_OPTIONS".
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Each object in the list is a two element tuple. The first element of
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each tuple is the name of the group under which the list of options in the
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second element will be registered. A group name of None corresponds to the
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[DEFAULT] group in config files.
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This function is also discoverable via the 'oslo_config.opts' entry point
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under the 'oslo_cache.config.opts' namespace.
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The purpose of this is to allow tools like the Oslo sample config file
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generator to discover the options exposed to users by this library.
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:returns: a list of (group_name, opts) tuples
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"""
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return list(FILE_OPTIONS.items())
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