class Trigger(object):
def __init__(self):
self.connection = None
self.subscription = None
self.current_loop = None
self.config_version = 0
self.run = True
self.config = ConfigStorage()
self.db_log = LoggingStorage()
self.tq_storage = None
self.triggers = {}
self.metrics_id_to_triggers = defaultdict(list)
self._reload_triggers_config_last_run = 0
def bootstrap(self):
log.info("Running trigger loop")
self.connection = yield from asyncio_redis.Pool.create(host='localhost', port=6379, encoder=asyncio_redis.encoders.BytesEncoder(), poolsize=3)
self.tq_storage = TaskStorage(self.current_loop, self.connection)
# Setup subscription to action results
self.subscription = yield from self.connection.start_subscribe()
yield from self.subscription.psubscribe([ SETTINGS.METRICS_CHANNEL.format('*').encode('utf-8') ])
def start(self, loop):
self.current_loop = loop
loop.add_signal_handler(signal.SIGINT, partial(self.stop, 'SIGINT'))
loop.add_signal_handler(signal.SIGTERM, partial(self.stop, 'SIGTERM'))
asyncio.Task(self.loop())
def stop(self, sig):
log.info("Got {} signal, we should finish all tasks and stop daemon".format(sig))
self.run = False
self.current_loop.stop()
@asyncio.coroutine
def get_new_message(self):
reply = yield from self.subscription.next_published()
@asyncio.coroutine
def loop(self):
yield from self.bootstrap()
while self.run:
# Load triggers list
yield from self._reload_config()
# Wait for new message
try:
reply = yield from self.subscription.next_published()
except GeneratorExit:
log.info('Stop subscription')
break
log.debug('Got new message, channel={}'.format(reply.channel))
# Decode new message
try:
_, metric_id = yield from self._decode_message(reply)
except Exception:
log.error("Cannon load data from message in channel={}".format(reply.channel), exc_info=True)
# Process triggers
triggers = self.metrics_id_to_triggers.get(metric_id, [])
for trigger_id in triggers:
asyncio.Task(self.check_trigger(trigger_id, metric_id))
self.current_loop.stop()
self.connection.close()
log.info('Bye-bye!')
@asyncio.coroutine
def _decode_message(self, msg):
metrics_mask = SETTINGS.METRICS_CHANNEL.replace("{}", "")
channel = msg.channel.decode('utf-8')
if channel.startswith(metrics_mask):
return 'metrics-results', channel[len(metrics_mask):]
else:
raise Exception()
# return '', channel
@asyncio.coroutine
def _reload_config(self):
time_now = int(now())
if time_now - self._reload_triggers_config_last_run < 1000: # 1000 = 1sec
return
self._reload_triggers_config_last_run = time_now
config_version = self.config.get_config_version()
if config_version != self.config_version:
yield from self._reload_triggers()
self.config_version = config_version
@asyncio.coroutine
def _reload_triggers(self):
new_triggers = self.config.list_triggers()
self.triggers = new_triggers
self.metrics_id_to_triggers = defaultdict(list)
for trigger_id, trigger in new_triggers.items():
for condition in trigger.get('conditions', []):
self.metrics_id_to_triggers[condition.get('metric_id')].append(trigger_id)
log.info('Loaded {} triggers'.format(len(new_triggers)))
@asyncio.coroutine
def _activate_trigger(self, trigger):
self.db_log.info("Триггер был запущен", None, "trigger", trigger['_id'])
log.debug("_activare_trigger for {}".format(trigger['_id']))
for action_obj in trigger['scenario']:
# Extract values from trigger into dict (param_name -> param_value)
params_values = {param.get('param'): param.get('value') for param in action_obj['params']}
# Get action with binded params
action = self.config.get_action(action_obj['action_id'],
initial_param_values=params_values,
connection_id=trigger.get('connection_id'))
log.debug('Trigger {}: create task for action {} with params {}'.format(trigger['_id'], action['_id'], params_values))
task = yield from self.tq_storage.create_task(name=action['_id'],
task_type=Task.TYPE_TRIGGERED,
run_at=datetime.datetime.now(),
ttl=action.get('ttl') or SETTINGS.WORKER_TASK_TIMEOUT,
kwargs=action,
store_to=Task.STORE_TO_METRICS)
yield from self.tq_storage.schedule_task(task)
""" TASKS """
@asyncio.coroutine
def check_trigger(self, trigger_id, metric_id):
log.info('Check trigger {} for metric {}'.format(trigger_id, metric_id))
trigger = self.triggers[trigger_id]
last_values = yield from self.tq_storage.get_metric_last_values(trigger['depends_on'])
log.debug('Trigger {}: last values is {}'.format(trigger_id, last_values))
checks = ((trigger_id, cond.get('value', ''), cond['function'], last_values.get(cond['metric_id'])) for cond in trigger['conditions'])
is_triggered = all(map(lambda check: self.check_condition(*check), checks))
if is_triggered:
# Check lock
log.info('Trigger {} is activated!'.format(trigger_id))
locked = yield from self.tq_storage.lock_trigger(trigger_id)
if locked > 1:
log.info('Trigger {} is locked {} times, do not perform action'.format(trigger_id, locked))
return
# Perform action on trigger, it's not locked
yield from self._activate_trigger(trigger)
else:
# Unlock trigger here
log.debug('Trigger {} is NOT activated, try to unlock!'.format(trigger_id))
yield from self.tq_storage.unlock_trigger(trigger_id)
def check_condition(self, trigger_id, cmp_value, condition, value):
if condition not in SETTINGS.CONDITIONS_CMP_FUNCTIONS.keys():
log.error("Cannot determine condition for trigger '{}': wrong function '{}'".format(trigger_id, condition))
return False
if condition in SETTINGS.CONDITIONS_NUMBERIC:
try:
value = float(value)
except (ValueError, TypeError):
log.error("Wrong value for trigger '{}', cannot convert metric value '{}' to float before comparasion".format(trigger_id, cmp_value), exc_info=True)
self.db_log.error("Cannot convert metric value to float before comparasion", str(value), "trigger", trigger_id)
return False
try:
cmp_value = float(cmp_value)
except (ValueError, TypeError):
log.error("Wrong value for trigger '{}', cannot convert comparasion value '{}' to float before comparasion".format(trigger_id, cmp_value), exc_info=True)
self.db_log.error("Cannot convert comparasion value to float before comparasion", str(cmp_value), "trigger", trigger_id)
return False
elif condition in SETTINGS.CONDITIONS_BOOLEAN:
try:
value = bool(int(value))
except:
log.error("Wrong value for trigger '{}', can't cast value to boolean '{}'".format(trigger_id, value))
self.db_log.error("Can't cast value to boolean '{}'".format(value), str(value), "trigger", trigger_id)
return False
elif condition in SETTINGS.CONDITIONS_STRINGS and not isinstance(value, str):
log.error("Wrong value for trigger '{}', for strings comparasion it should be string, not '{}'".format(trigger_id, value))
self.db_log.error("For strings comparasion value should be strings, not '{}'".format(value), str(value), "trigger", trigger_id)
return False
try:
result = SETTINGS.CONDITIONS_CMP_FUNCTIONS[condition](value, cmp_value)
log.debug("Compare values: '{}' {} '{}'".format(value, condition, cmp_value))
except:
log.error("Cannot compare values: '{}' {} '{}'".format(value, condition, cmp_value))
self.db_log.error("Cannot compare values: '{}' {} '{}'".format(value, condition, cmp_value), None, "trigger", trigger_id)
return False
return result
class Trigger(object):
def __init__(self):
self.connection = None
self.subscription = None
self.current_loop = None
self.config_version = 0
self.run = True
self.config = ConfigStorage()
self.db_log = LoggingStorage()
self.tq_storage = None
self.triggers = {}
self.metrics_id_to_triggers = defaultdict(list)
self._reload_triggers_config_last_run = 0
def bootstrap(self):
log.info("Running trigger loop")
self.connection = yield from asyncio_redis.Pool.create(
host='localhost',
port=6379,
encoder=asyncio_redis.encoders.BytesEncoder(),
poolsize=3)
self.tq_storage = TaskStorage(self.current_loop, self.connection)
# Setup subscription to action results
self.subscription = yield from self.connection.start_subscribe()
yield from self.subscription.psubscribe(
[SETTINGS.METRICS_CHANNEL.format('*').encode('utf-8')])
def start(self, loop):
self.current_loop = loop
loop.add_signal_handler(signal.SIGINT, partial(self.stop, 'SIGINT'))
loop.add_signal_handler(signal.SIGTERM, partial(self.stop, 'SIGTERM'))
asyncio.Task(self.loop())
def stop(self, sig):
log.info(
"Got {} signal, we should finish all tasks and stop daemon".format(
sig))
self.run = False
self.current_loop.stop()
@asyncio.coroutine
def get_new_message(self):
reply = yield from self.subscription.next_published()
@asyncio.coroutine
def loop(self):
yield from self.bootstrap()
while self.run:
# Load triggers list
yield from self._reload_config()
# Wait for new message
try:
reply = yield from self.subscription.next_published()
except GeneratorExit:
log.info('Stop subscription')
break
log.debug('Got new message, channel={}'.format(reply.channel))
# Decode new message
try:
_, metric_id = yield from self._decode_message(reply)
except Exception:
log.error("Cannon load data from message in channel={}".format(
reply.channel),
exc_info=True)
# Process triggers
triggers = self.metrics_id_to_triggers.get(metric_id, [])
for trigger_id in triggers:
asyncio.Task(self.check_trigger(trigger_id, metric_id))
self.current_loop.stop()
self.connection.close()
log.info('Bye-bye!')
@asyncio.coroutine
def _decode_message(self, msg):
metrics_mask = SETTINGS.METRICS_CHANNEL.replace("{}", "")
channel = msg.channel.decode('utf-8')
if channel.startswith(metrics_mask):
return 'metrics-results', channel[len(metrics_mask):]
else:
raise Exception()
# return '', channel
@asyncio.coroutine
def _reload_config(self):
time_now = int(now())
if time_now - self._reload_triggers_config_last_run < 1000: # 1000 = 1sec
return
self._reload_triggers_config_last_run = time_now
config_version = self.config.get_config_version()
if config_version != self.config_version:
yield from self._reload_triggers()
self.config_version = config_version
@asyncio.coroutine
def _reload_triggers(self):
new_triggers = self.config.list_triggers()
self.triggers = new_triggers
self.metrics_id_to_triggers = defaultdict(list)
for trigger_id, trigger in new_triggers.items():
for condition in trigger.get('conditions', []):
self.metrics_id_to_triggers[condition.get('metric_id')].append(
trigger_id)
log.info('Loaded {} triggers'.format(len(new_triggers)))
@asyncio.coroutine
def _activate_trigger(self, trigger):
self.db_log.info("Триггер был запущен", None, "trigger",
trigger['_id'])
log.debug("_activare_trigger for {}".format(trigger['_id']))
for action_obj in trigger['scenario']:
# Extract values from trigger into dict (param_name -> param_value)
params_values = {
param.get('param'): param.get('value')
for param in action_obj['params']
}
# Get action with binded params
action = self.config.get_action(
action_obj['action_id'],
initial_param_values=params_values,
connection_id=trigger.get('connection_id'))
log.debug(
'Trigger {}: create task for action {} with params {}'.format(
trigger['_id'], action['_id'], params_values))
task = yield from self.tq_storage.create_task(
name=action['_id'],
task_type=Task.TYPE_TRIGGERED,
run_at=datetime.datetime.now(),
ttl=action.get('ttl') or SETTINGS.WORKER_TASK_TIMEOUT,
kwargs=action,
store_to=Task.STORE_TO_METRICS)
yield from self.tq_storage.schedule_task(task)
""" TASKS """
@asyncio.coroutine
def check_trigger(self, trigger_id, metric_id):
log.info('Check trigger {} for metric {}'.format(
trigger_id, metric_id))
trigger = self.triggers[trigger_id]
last_values = yield from self.tq_storage.get_metric_last_values(
trigger['depends_on'])
log.debug('Trigger {}: last values is {}'.format(
trigger_id, last_values))
checks = ((trigger_id, cond.get('value', ''), cond['function'],
last_values.get(cond['metric_id']))
for cond in trigger['conditions'])
is_triggered = all(
map(lambda check: self.check_condition(*check), checks))
if is_triggered:
# Check lock
log.info('Trigger {} is activated!'.format(trigger_id))
locked = yield from self.tq_storage.lock_trigger(trigger_id)
if locked > 1:
log.info(
'Trigger {} is locked {} times, do not perform action'.
format(trigger_id, locked))
return
# Perform action on trigger, it's not locked
yield from self._activate_trigger(trigger)
else:
# Unlock trigger here
log.debug('Trigger {} is NOT activated, try to unlock!'.format(
trigger_id))
yield from self.tq_storage.unlock_trigger(trigger_id)
def check_condition(self, trigger_id, cmp_value, condition, value):
if condition not in SETTINGS.CONDITIONS_CMP_FUNCTIONS.keys():
log.error(
"Cannot determine condition for trigger '{}': wrong function '{}'"
.format(trigger_id, condition))
return False
if condition in SETTINGS.CONDITIONS_NUMBERIC:
try:
value = float(value)
except (ValueError, TypeError):
log.error(
"Wrong value for trigger '{}', cannot convert metric value '{}' to float before comparasion"
.format(trigger_id, cmp_value),
exc_info=True)
self.db_log.error(
"Cannot convert metric value to float before comparasion",
str(value), "trigger", trigger_id)
return False
try:
cmp_value = float(cmp_value)
except (ValueError, TypeError):
log.error(
"Wrong value for trigger '{}', cannot convert comparasion value '{}' to float before comparasion"
.format(trigger_id, cmp_value),
exc_info=True)
self.db_log.error(
"Cannot convert comparasion value to float before comparasion",
str(cmp_value), "trigger", trigger_id)
return False
elif condition in SETTINGS.CONDITIONS_BOOLEAN:
try:
value = bool(int(value))
except:
log.error(
"Wrong value for trigger '{}', can't cast value to boolean '{}'"
.format(trigger_id, value))
self.db_log.error(
"Can't cast value to boolean '{}'".format(value),
str(value), "trigger", trigger_id)
return False
elif condition in SETTINGS.CONDITIONS_STRINGS and not isinstance(
value, str):
log.error(
"Wrong value for trigger '{}', for strings comparasion it should be string, not '{}'"
.format(trigger_id, value))
self.db_log.error(
"For strings comparasion value should be strings, not '{}'".
format(value), str(value), "trigger", trigger_id)
return False
try:
result = SETTINGS.CONDITIONS_CMP_FUNCTIONS[condition](value,
cmp_value)
log.debug("Compare values: '{}' {} '{}'".format(
value, condition, cmp_value))
except:
log.error("Cannot compare values: '{}' {} '{}'".format(
value, condition, cmp_value))
self.db_log.error(
"Cannot compare values: '{}' {} '{}'".format(
value, condition, cmp_value), None, "trigger", trigger_id)
return False
return result