monasca-agent/monagent/monstatsd/reporter.py

119 lines
3.9 KiB
Python

import json
import logging
import threading
from monagent.common.check_status import MonstatsdStatus
from monagent.common.emitter import http_emitter
from monagent.common.util import plural
from monagent.common.config import initialize_logging
initialize_logging('monstatsd')
log = logging.getLogger('monstatsd')
WATCHDOG_TIMEOUT = 120
# Since we call flush more often than the metrics aggregation interval, we should
# log a bunch of flushes in a row every so often.
FLUSH_LOGGING_PERIOD = 70
FLUSH_LOGGING_INITIAL = 10
FLUSH_LOGGING_COUNT = 5
EVENT_CHUNK_SIZE = 50
class Reporter(threading.Thread):
"""
The reporter periodically sends the aggregated metrics to the
server.
"""
def __init__(self, interval, aggregator, api_host, use_watchdog=False, event_chunk_size=None):
threading.Thread.__init__(self)
self.interval = int(interval)
self.finished = threading.Event()
self.aggregator = aggregator
self.flush_count = 0
self.log_count = 0
self.watchdog = None
if use_watchdog:
from monagent.common.util import Watchdog
self.watchdog = Watchdog(WATCHDOG_TIMEOUT)
self.api_host = api_host
self.event_chunk_size = event_chunk_size or EVENT_CHUNK_SIZE
@staticmethod
def serialize_metrics(metrics):
return json.dumps({"series": metrics})
def stop(self):
log.info("Stopping reporter")
self.finished.set()
def run(self):
log.info("Reporting to %s every %ss" % (self.api_host, self.interval))
log.debug("Watchdog enabled: %s" % bool(self.watchdog))
# Persist a start-up message.
MonstatsdStatus().persist()
while not self.finished.isSet(): # Use camel case isSet for 2.4 support.
self.finished.wait(self.interval)
self.flush()
if self.watchdog:
self.watchdog.reset()
# Clean up the status messages.
log.debug("Stopped reporter")
MonstatsdStatus.remove_latest_status()
def flush(self):
try:
self.flush_count += 1
self.log_count += 1
metrics = self.aggregator.flush()
count = len(metrics)
if self.flush_count % FLUSH_LOGGING_PERIOD == 0:
self.log_count = 0
if count:
try:
http_emitter(metrics, log, self.api_host)
except Exception:
log.exception("Error running emitter.")
events = self.aggregator.flush_events()
event_count = len(events)
if event_count:
log.warn('Event received but events are not available in the mon api')
should_log = self.flush_count <= FLUSH_LOGGING_INITIAL or self.log_count <= FLUSH_LOGGING_COUNT
log_func = log.info
if not should_log:
log_func = log.debug
log_func(
"Flush #%s: flushed %s metric%s and %s event%s" %
(self.flush_count,
count,
plural(count),
event_count,
plural(event_count)))
if self.flush_count == FLUSH_LOGGING_INITIAL:
log.info(
"First flushes done, %s flushes will be logged every %s flushes." %
(FLUSH_LOGGING_COUNT, FLUSH_LOGGING_PERIOD))
# Persist a status message.
packet_count = self.aggregator.total_count
packets_per_second = self.aggregator.packets_per_second(self.interval)
MonstatsdStatus(
flush_count=self.flush_count,
packet_count=packet_count,
packets_per_second=packets_per_second,
metric_count=count,
event_count=event_count,
).persist()
except Exception:
log.exception("Error flushing metrics")