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# slog_filter.py - structured logging filtering
#
# Copyright 2017 QvarnLabs Ab
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import re
class FilterRule: # pragma: no cover
def allow(self, log_obj):
raise NotImplementedError()
class FilterAllow(FilterRule):
def allow(self, log_obj):
return True
class FilterDeny(FilterRule):
def allow(self, log_obj):
return False
class FilterHasField(FilterRule):
def __init__(self, field_name):
self._field_name = field_name
def allow(self, log_obj):
return self._field_name in log_obj
class FilterFieldHasValue(FilterRule):
def __init__(self, field, value):
self._field = field
self._value = value
def allow(self, log_obj):
return self._field in log_obj and log_obj[self._field] == self._value
class FilterFieldValueRegexp(FilterRule):
def __init__(self, field, pattern):
self._field = field
self._pattern = pattern
def allow(self, log_obj):
if self._field not in log_obj:
return False
value = str(log_obj[self._field])
return re.search(self._pattern, value) is not None
class FilterInclude(FilterRule):
def __init__(self, rule_dict, rule):
self._rule = rule
self._include = rule_dict.get('include', True)
def allow(self, log_obj):
allow = self._rule.allow(log_obj)
return (self._include and allow) or (not self._include and not allow)
class FilterAny(FilterRule):
def __init__(self, rules):
self._rules = rules
def allow(self, log_obj):
return any(rule.allow(log_obj) for rule in self._rules)
def construct_log_filter(filters):
if not filters:
raise NoFilter()
rules = []
for spec in filters:
rule = None
if 'field' in spec:
if 'value' in spec:
rule = FilterFieldHasValue(spec['field'], spec['value'])
elif 'regexp' in spec:
rule = FilterFieldValueRegexp(
spec['field'], spec['regexp'])
elif 'field' in spec:
rule = FilterHasField(spec['field'])
else: # pragma: no cover
rule = FilterAllow()
if 'include' in spec:
rule = FilterInclude(spec, rule)
rules.append(rule)
return FilterAny(rules)
class NoFilter(Exception):
def __init__(self):
super(NoFilter, self).__init__('No log filter specified')
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