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# Licensed to the StackStorm, Inc ('StackStorm') under one or more |
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# contributor license agreements. See the NOTICE file distributed with |
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# this work for additional information regarding copyright ownership. |
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# The ASF licenses this file to You under the Apache License, Version 2.0 |
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# (the "License"); you may not use this file except in compliance with |
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# the License. You may obtain 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, |
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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# See the License for the specific language governing permissions and |
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# limitations under the License. |
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import os |
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import six |
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from jinja2.exceptions import UndefinedError |
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from st2common import log as logging |
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from st2common.content.loader import MetaLoader |
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from st2common.models.db.rule import RuleDB |
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from st2common.models.db.trigger import TriggerDB |
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from st2common.models.db.trigger import TriggerInstanceDB |
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from st2common.models.system.common import ResourceReference |
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from st2common.persistence.reactor import Rule, TriggerInstance, Trigger |
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from st2reactor.rules.enforcer import RuleEnforcer |
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from st2reactor.rules.matcher import RulesMatcher |
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__all__ = [ |
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'RuleTester' |
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] |
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LOG = logging.getLogger(__name__) |
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class RuleTester(object): |
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def __init__(self, rule_file_path=None, rule_ref=None, trigger_instance_file_path=None, |
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trigger_instance_id=None): |
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""" |
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:param rule_file_path: Path to the file containing rule definition. |
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:type rule_file_path: ``str`` |
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:param trigger_instance_file_path: Path to the file containg trigger instance definition. |
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:type trigger_instance_file_path: ``str`` |
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""" |
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self._rule_file_path = rule_file_path |
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self._rule_ref = rule_ref |
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self._trigger_instance_file_path = trigger_instance_file_path |
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self._trigger_instance_id = trigger_instance_id |
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self._meta_loader = MetaLoader() |
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def evaluate(self): |
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""" |
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Evaluate trigger instance against the rule. |
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:return: ``True`` if the rule matches, ``False`` otherwise. |
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:rtype: ``boolean`` |
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""" |
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rule_db = self._get_rule_db() |
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trigger_instance_db, trigger_db = self._get_trigger_instance_db() |
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# The trigger check needs to be performed here as that is not performed |
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# by RulesMatcher. |
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if rule_db.trigger != trigger_db.ref: |
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LOG.info('rule.trigger "%s" and trigger.ref "%s" do not match.', |
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rule_db.trigger, trigger_db.ref) |
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return False |
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# Check if rule matches criteria. |
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matcher = RulesMatcher(trigger_instance=trigger_instance_db, trigger=trigger_db, |
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rules=[rule_db], extra_info=True) |
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matching_rules = matcher.get_matching_rules() |
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# Rule does not match so early exit. |
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if len(matching_rules) < 1: |
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return False |
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# Check if rule can be enforced |
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try: |
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enforcer = RuleEnforcer(trigger_instance=trigger_instance_db, rule=rule_db) |
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params = enforcer.get_resolved_parameters() |
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LOG.info('Action parameters resolved to:') |
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for param in six.iteritems(params): |
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LOG.info('\t%s: %s', param[0], param[1]) |
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return True |
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except (UndefinedError, ValueError) as e: |
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LOG.error('Failed to resolve parameters\n\tOriginal error : %s', str(e)) |
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return False |
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except: |
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LOG.exception('Failed to resolve parameters.') |
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return False |
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def _get_rule_db(self): |
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if self._rule_file_path: |
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return self._get_rule_db_from_file( |
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file_path=os.path.realpath(self._rule_file_path)) |
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elif self._rule_ref: |
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return Rule.get_by_ref(self._rule_ref) |
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raise ValueError('One of _rule_file_path or _rule_ref should be specified.') |
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def _get_trigger_instance_db(self): |
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if self._trigger_instance_file_path: |
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return self._get_trigger_instance_db_from_file( |
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file_path=os.path.realpath(self._trigger_instance_file_path)) |
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elif self._trigger_instance_id: |
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trigger_instance_db = TriggerInstance.get_by_id(self._trigger_instance_id) |
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trigger_db = Trigger.get_by_ref(trigger_instance_db.trigger) |
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return trigger_instance_db, trigger_db |
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raise ValueError('One of _trigger_instance_file_path or' |
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'_trigger_instance_id should be specified.') |
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def _get_rule_db_from_file(self, file_path): |
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data = self._meta_loader.load(file_path=file_path) |
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pack = data.get('pack', 'unknown') |
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name = data.get('name', 'unknown') |
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trigger = data['trigger']['type'] |
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criteria = data.get('criteria', None) |
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rule_db = RuleDB(pack=pack, name=name, trigger=trigger, criteria=criteria, action={}, |
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enabled=True) |
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return rule_db |
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def _get_trigger_instance_db_from_file(self, file_path): |
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data = self._meta_loader.load(file_path=file_path) |
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instance = TriggerInstanceDB(**data) |
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trigger_ref = ResourceReference.from_string_reference(instance['trigger']) |
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trigger_db = TriggerDB(pack=trigger_ref.pack, name=trigger_ref.name, type=trigger_ref.ref) |
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return instance, trigger_db |
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StackStorm /
st2
