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