Update Keystone core to Mitaka.

Change-Id: Ia10d6add16f4a9d25d1f42d420661c46332e69db

1 files changed, 84 insertions, 268 deletions

diff --git a/keystone-moon/keystone/common/cache/core.py b/keystone-moon/keystone/common/cache/core.py
index 306587b3..6bb0af51 100644
--- a/keystone-moon/keystone/common/cache/core.py
+++ b/keystone-moon/keystone/common/cache/core.py
@@ -13,23 +13,41 @@
 # under the License.
 
 """Keystone Caching Layer Implementation."""
-
 import dogpile.cache
-from dogpile.cache import proxy
-from dogpile.cache import util
+from dogpile.cache import api
+from oslo_cache import core as cache
 from oslo_config import cfg
-from oslo_log import log
-from oslo_utils import importutils
 
-from keystone import exception
-from keystone.i18n import _, _LE
+from keystone.common.cache import _context_cache
 
 
 CONF = cfg.CONF
-LOG = log.getLogger(__name__)
+CACHE_REGION = cache.create_region()
+
+
+def configure_cache(region=None):
+    if region is None:
+        region = CACHE_REGION
+    # NOTE(morganfainberg): running cache.configure_cache_region()
+    # sets region.is_configured, this must be captured before
+    # cache.configure_cache_region is called.
+    configured = region.is_configured
+    cache.configure_cache_region(CONF, region)
+    # Only wrap the region if it was not configured. This should be pushed
+    # to oslo_cache lib somehow.
+    if not configured:
+        region.wrap(_context_cache._ResponseCacheProxy)
+
+
+def get_memoization_decorator(group, expiration_group=None, region=None):
+    if region is None:
+        region = CACHE_REGION
+    return cache.get_memoization_decorator(CONF, region, group,
+                                           expiration_group=expiration_group)
 
-make_region = dogpile.cache.make_region
 
+# NOTE(stevemar): When memcache_pool, mongo and noop backends are removed
+# we no longer need to register the backends here.
 dogpile.cache.register_backend(
     'keystone.common.cache.noop',
     'keystone.common.cache.backends.noop',
@@ -46,263 +64,61 @@ dogpile.cache.register_backend(
     'PooledMemcachedBackend')
 
 
-class DebugProxy(proxy.ProxyBackend):
-    """Extra Logging ProxyBackend."""
-    # NOTE(morganfainberg): Pass all key/values through repr to ensure we have
-    # a clean description of the information.  Without use of repr, it might
-    # be possible to run into encode/decode error(s). For logging/debugging
-    # purposes encode/decode is irrelevant and we should be looking at the
-    # data exactly as it stands.
-
-    def get(self, key):
-        value = self.proxied.get(key)
-        LOG.debug('CACHE_GET: Key: "%(key)r" Value: "%(value)r"',
-                  {'key': key, 'value': value})
-        return value
-
-    def get_multi(self, keys):
-        values = self.proxied.get_multi(keys)
-        LOG.debug('CACHE_GET_MULTI: "%(keys)r" Values: "%(values)r"',
-                  {'keys': keys, 'values': values})
-        return values
-
-    def set(self, key, value):
-        LOG.debug('CACHE_SET: Key: "%(key)r" Value: "%(value)r"',
-                  {'key': key, 'value': value})
-        return self.proxied.set(key, value)
-
-    def set_multi(self, keys):
-        LOG.debug('CACHE_SET_MULTI: "%r"', keys)
-        self.proxied.set_multi(keys)
-
-    def delete(self, key):
-        self.proxied.delete(key)
-        LOG.debug('CACHE_DELETE: "%r"', key)
-
-    def delete_multi(self, keys):
-        LOG.debug('CACHE_DELETE_MULTI: "%r"', keys)
-        self.proxied.delete_multi(keys)
-
-
-def build_cache_config():
-    """Build the cache region dictionary configuration.
-
-    :returns: dict
+# TODO(morganfainberg): Move this logic up into oslo.cache directly
+# so we can handle region-wide invalidations or alternatively propose
+# a fix to dogpile.cache to make region-wide invalidates possible to
+# work across distributed processes.
+class _RegionInvalidator(object):
+
+    def __init__(self, region, region_name):
+        self.region = region
+        self.region_name = region_name
+        region_key = '_RegionExpiration.%(type)s.%(region_name)s'
+        self.soft_region_key = region_key % {'type': 'soft',
+                                             'region_name': self.region_name}
+        self.hard_region_key = region_key % {'type': 'hard',
+                                             'region_name': self.region_name}
+
+    @property
+    def hard_invalidated(self):
+        invalidated = self.region.backend.get(self.hard_region_key)
+        if invalidated is not api.NO_VALUE:
+            return invalidated.payload
+        return None
+
+    @hard_invalidated.setter
+    def hard_invalidated(self, value):
+        self.region.set(self.hard_region_key, value)
+
+    @hard_invalidated.deleter
+    def hard_invalidated(self):
+        self.region.delete(self.hard_region_key)
+
+    @property
+    def soft_invalidated(self):
+        invalidated = self.region.backend.get(self.soft_region_key)
+        if invalidated is not api.NO_VALUE:
+            return invalidated.payload
+        return None
+
+    @soft_invalidated.setter
+    def soft_invalidated(self, value):
+        self.region.set(self.soft_region_key, value)
+
+    @soft_invalidated.deleter
+    def soft_invalidated(self):
+        self.region.delete(self.soft_region_key)
+
+
+def apply_invalidation_patch(region, region_name):
+    """Patch the region interfaces to ensure we share the expiration time.
+
+    This method is used to patch region.invalidate, region._hard_invalidated,
+    and region._soft_invalidated.
     """
-    prefix = CONF.cache.config_prefix
-    conf_dict = {}
-    conf_dict['%s.backend' % prefix] = CONF.cache.backend
-    conf_dict['%s.expiration_time' % prefix] = CONF.cache.expiration_time
-    for argument in CONF.cache.backend_argument:
-        try:
-            (argname, argvalue) = argument.split(':', 1)
-        except ValueError:
-            msg = _LE('Unable to build cache config-key. Expected format '
-                      '"<argname>:<value>". Skipping unknown format: %s')
-            LOG.error(msg, argument)
-            continue
-
-        arg_key = '.'.join([prefix, 'arguments', argname])
-        conf_dict[arg_key] = argvalue
-
-        LOG.debug('Keystone Cache Config: %s', conf_dict)
-    # NOTE(yorik-sar): these arguments will be used for memcache-related
-    # backends. Use setdefault for url to support old-style setting through
-    # backend_argument=url:127.0.0.1:11211
-    conf_dict.setdefault('%s.arguments.url' % prefix,
-                         CONF.cache.memcache_servers)
-    for arg in ('dead_retry', 'socket_timeout', 'pool_maxsize',
-                'pool_unused_timeout', 'pool_connection_get_timeout'):
-        value = getattr(CONF.cache, 'memcache_' + arg)
-        conf_dict['%s.arguments.%s' % (prefix, arg)] = value
-
-    return conf_dict
-
-
-def configure_cache_region(region):
-    """Configure a cache region.
-
-    :param region: optional CacheRegion object, if not provided a new region
-                   will be instantiated
-    :raises: exception.ValidationError
-    :returns: dogpile.cache.CacheRegion
-    """
-    if not isinstance(region, dogpile.cache.CacheRegion):
-        raise exception.ValidationError(
-            _('region not type dogpile.cache.CacheRegion'))
-
-    if not region.is_configured:
-        # NOTE(morganfainberg): this is how you tell if a region is configured.
-        # There is a request logged with dogpile.cache upstream to make this
-        # easier / less ugly.
-
-        config_dict = build_cache_config()
-        region.configure_from_config(config_dict,
-                                     '%s.' % CONF.cache.config_prefix)
-
-        if CONF.cache.debug_cache_backend:
-            region.wrap(DebugProxy)
-
-        # NOTE(morganfainberg): if the backend requests the use of a
-        # key_mangler, we should respect that key_mangler function.  If a
-        # key_mangler is not defined by the backend, use the sha1_mangle_key
-        # mangler provided by dogpile.cache. This ensures we always use a fixed
-        # size cache-key.
-        if region.key_mangler is None:
-            region.key_mangler = util.sha1_mangle_key
-
-        for class_path in CONF.cache.proxies:
-            # NOTE(morganfainberg): if we have any proxy wrappers, we should
-            # ensure they are added to the cache region's backend.  Since
-            # configure_from_config doesn't handle the wrap argument, we need
-            # to manually add the Proxies. For information on how the
-            # ProxyBackends work, see the dogpile.cache documents on
-            # "changing-backend-behavior"
-            cls = importutils.import_class(class_path)
-            LOG.debug("Adding cache-proxy '%s' to backend.", class_path)
-            region.wrap(cls)
-
-    return region
-
-
-def get_should_cache_fn(section):
-    """Build a function that returns a config section's caching status.
-
-    For any given driver in keystone that has caching capabilities, a boolean
-    config option for that driver's section (e.g. ``token``) should exist and
-    default to ``True``.  This function will use that value to tell the caching
-    decorator if caching for that driver is enabled.  To properly use this
-    with the decorator, pass this function the configuration section and assign
-    the result to a variable.  Pass the new variable to the caching decorator
-    as the named argument ``should_cache_fn``.  e.g.::
-
-        from keystone.common import cache
-
-        SHOULD_CACHE = cache.get_should_cache_fn('token')
-
-        @cache.on_arguments(should_cache_fn=SHOULD_CACHE)
-        def function(arg1, arg2):
-            ...
-
-    :param section: name of the configuration section to examine
-    :type section: string
-    :returns: function reference
-    """
-    def should_cache(value):
-        if not CONF.cache.enabled:
-            return False
-        conf_group = getattr(CONF, section)
-        return getattr(conf_group, 'caching', True)
-    return should_cache
-
-
-def get_expiration_time_fn(section):
-    """Build a function that returns a config section's expiration time status.
-
-    For any given driver in keystone that has caching capabilities, an int
-    config option called ``cache_time`` for that driver's section
-    (e.g. ``token``) should exist and typically default to ``None``. This
-    function will use that value to tell the caching decorator of the TTL
-    override for caching the resulting objects. If the value of the config
-    option is ``None`` the default value provided in the
-    ``[cache] expiration_time`` option will be used by the decorator. The
-    default may be set to something other than ``None`` in cases where the
-    caching TTL should not be tied to the global default(s) (e.g.
-    revocation_list changes very infrequently and can be cached for >1h by
-    default).
-
-    To properly use this with the decorator, pass this function the
-    configuration section and assign the result to a variable. Pass the new
-    variable to the caching decorator as the named argument
-    ``expiration_time``.  e.g.::
-
-        from keystone.common import cache
-
-        EXPIRATION_TIME = cache.get_expiration_time_fn('token')
-
-        @cache.on_arguments(expiration_time=EXPIRATION_TIME)
-        def function(arg1, arg2):
-            ...
-
-    :param section: name of the configuration section to examine
-    :type section: string
-    :rtype: function reference
-    """
-    def get_expiration_time():
-        conf_group = getattr(CONF, section)
-        return getattr(conf_group, 'cache_time', None)
-    return get_expiration_time
-
-
-def key_generate_to_str(s):
-    # NOTE(morganfainberg): Since we need to stringify all arguments, attempt
-    # to stringify and handle the Unicode error explicitly as needed.
-    try:
-        return str(s)
-    except UnicodeEncodeError:
-        return s.encode('utf-8')
-
-
-def function_key_generator(namespace, fn, to_str=key_generate_to_str):
-    # NOTE(morganfainberg): This wraps dogpile.cache's default
-    # function_key_generator to change the default to_str mechanism.
-    return util.function_key_generator(namespace, fn, to_str=to_str)
-
-
-REGION = dogpile.cache.make_region(
-    function_key_generator=function_key_generator)
-on_arguments = REGION.cache_on_arguments
-
-
-def get_memoization_decorator(section, expiration_section=None):
-    """Build a function based on the `on_arguments` decorator for the section.
-
-    For any given driver in Keystone that has caching capabilities, a
-    pair of functions is required to properly determine the status of the
-    caching capabilities (a toggle to indicate caching is enabled and any
-    override of the default TTL for cached data). This function will return
-    an object that has the memoization decorator ``on_arguments``
-    pre-configured for the driver.
-
-    Example usage::
-
-        from keystone.common import cache
-
-        MEMOIZE = cache.get_memoization_decorator(section='token')
-
-        @MEMOIZE
-        def function(arg1, arg2):
-            ...
-
-
-        ALTERNATE_MEMOIZE = cache.get_memoization_decorator(
-            section='token', expiration_section='revoke')
-
-        @ALTERNATE_MEMOIZE
-        def function2(arg1, arg2):
-            ...
-
-    :param section: name of the configuration section to examine
-    :type section: string
-    :param expiration_section: name of the configuration section to examine
-                               for the expiration option. This will fall back
-                               to using ``section`` if the value is unspecified
-                               or ``None``
-    :type expiration_section: string
-    :rtype: function reference
-    """
-    if expiration_section is None:
-        expiration_section = section
-    should_cache = get_should_cache_fn(section)
-    expiration_time = get_expiration_time_fn(expiration_section)
-
-    memoize = REGION.cache_on_arguments(should_cache_fn=should_cache,
-                                        expiration_time=expiration_time)
-
-    # Make sure the actual "should_cache" and "expiration_time" methods are
-    # available. This is potentially interesting/useful to pre-seed cache
-    # values.
-    memoize.should_cache = should_cache
-    memoize.get_expiration_time = expiration_time
-
-    return memoize
+    # Patch the region object. This logic needs to be moved up into dogpile
+    # itself. Patching the internal interfaces, unfortunately, is the only
+    # way to handle this at the moment.
+    invalidator = _RegionInvalidator(region=region, region_name=region_name)
+    setattr(region, '_hard_invalidated', invalidator.hard_invalidated)
+    setattr(region, '_soft_invalidated', invalidator.soft_invalidated)