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#
# Copyright 2013 eNovance
#
# 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 re
import six
class NotificationFilter(object):
"""Filter notification messages
The NotificationFilter class is used to filter notifications that an
endpoint will received.
The notification can be filter on different fields: context,
publisher_id, event_type, metadata and payload.
The filter is done via a regular expression
filter_rule = NotificationFilter(
publisher_id='^compute.*',
context={'tenant_id': '^5f643cfc-664b-4c69-8000-ce2ed7b08216$',
'roles': 'private'},
event_type='^compute\.instance\..*',
metadata={'timestamp': 'Aug'},
payload={'state': '^active$')
"""
def __init__(self, context=None, publisher_id=None, event_type=None,
metadata=None, payload=None):
self._regex_publisher_id = None
self._regex_event_type = None
if publisher_id is not None:
self._regex_publisher_id = re.compile(publisher_id)
if event_type is not None:
self._regex_event_type = re.compile(event_type)
self._regexs_context = self._build_regex_dict(context)
self._regexs_metadata = self._build_regex_dict(metadata)
self._regexs_payload = self._build_regex_dict(payload)
@staticmethod
def _build_regex_dict(regex_list):
if regex_list is None:
return {}
return dict((k, re.compile(regex_list[k])) for k in regex_list)
@staticmethod
def _check_for_single_mismatch(data, regex):
if regex is None:
return False
if not isinstance(data, six.string_types):
return True
if not regex.match(data):
return True
return False
@classmethod
def _check_for_mismatch(cls, data, regex):
if isinstance(regex, dict):
for k in regex:
if k not in data:
return True
if cls._check_for_single_mismatch(data[k], regex[k]):
return True
return False
else:
return cls._check_for_single_mismatch(data, regex)
def match(self, context, publisher_id, event_type, metadata, payload):
if (self._check_for_mismatch(publisher_id, self._regex_publisher_id) or
self._check_for_mismatch(event_type, self._regex_event_type) or
self._check_for_mismatch(context, self._regexs_context) or
self._check_for_mismatch(metadata, self._regexs_metadata) or
self._check_for_mismatch(payload, self._regexs_payload)):
return False
return True
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