<s> from st2common import log as logging <EOL> from st2common . persistence . rule import Rule <EOL> from st2common . services . triggers import get_trigger_db_by_ref <EOL> from st2reactor . rules . enforcer import RuleEnforcer <EOL> from st2reactor . rules . matcher import RulesMatcher <EOL> LOG = logging . getLogger ( '<STR_LIT>' ) <EOL> class RulesEngine ( object ) : <EOL> def handle_trigger_instance ( self , trigger_instance ) : <EOL> matching_rules = self . get_matching_rules_for_trigger ( trigger_instance ) <EOL> enforcers = self . create_rule_enforcers ( trigger_instance , matching_rules ) <EOL> self . enforce_rules ( enforcers ) <EOL> def get_matching_rules_for_trigger ( self , trigger_instance ) : <EOL> trigger = trigger_instance . trigger <EOL> trigger = get_trigger_db_by_ref ( trigger_instance . trigger ) <EOL> rules = Rule . query ( trigger = trigger_instance . trigger , enabled = True ) <EOL> LOG . info ( '<STR_LIT>' , len ( rules ) , trigger [ '<STR_LIT:name>' ] , <EOL> trigger [ '<STR_LIT:type>' ] ) <EOL> matcher = RulesMatcher ( trigger_instance = trigger_instance , <EOL> trigger = trigger , rules = rules ) <EOL> matching_rules = matcher . get_matching_rules ( ) <EOL> LOG . info ( '<STR_LIT>' , len ( matching_rules ) , <EOL> trigger [ '<STR_LIT:name>' ] , trigger [ '<STR_LIT:type>' ] ) <EOL> return matching_rules <EOL> def create_rule_enforcers ( self , trigger_instance , matching_rules ) : <EOL> """<STR_LIT>""" <EOL> enforcers = [ ] <EOL> for matching_rule in matching_rules : <EOL> enforcers . append ( RuleEnforcer ( trigger_instance , matching_rule ) ) <EOL> return enforcers <EOL> def enforce_rules ( self , enforcers ) : <EOL> for enforcer in enforcers : <EOL> try : <EOL> enforcer . enforce ( ) <EOL> except : <EOL> LOG . exception ( '<STR_LIT>' , enforcer . rule ) </s>
