96 lines
2.9 KiB
Python
96 lines
2.9 KiB
Python
import logging
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import boto
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import time
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import random
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from Queue import Empty
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from threading import Thread
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logger = logging.getLogger(__name__)
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MAX_BATCH_METRICS = 20
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# Sleep for this much time between failed send requests.
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# This prevents hammering cloudwatch when it's not available.
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FAILED_SEND_SLEEP_SECS = 15
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def start_cloudwatch_sender(metrics, app):
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"""
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Starts sending from metrics to a new CloudWatchSender.
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"""
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access_key = app.config.get('CLOUDWATCH_AWS_ACCESS_KEY')
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secret_key = app.config.get('CLOUDWATCH_AWS_SECRET_KEY')
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namespace = app.config.get('CLOUDWATCH_NAMESPACE')
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if not namespace:
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logger.debug('CloudWatch not configured')
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return
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sender = CloudWatchSender(metrics, access_key, secret_key, namespace)
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sender.start()
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class CloudWatchSender(Thread):
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"""
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CloudWatchSender loops indefinitely and pulls metrics off of a queue then sends it to CloudWatch.
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"""
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def __init__(self, metrics, aws_access_key, aws_secret_key, namespace):
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Thread.__init__(self)
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self.daemon = True
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self._aws_access_key = aws_access_key
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self._aws_secret_key = aws_secret_key
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self._metrics = metrics
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self._namespace = namespace
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def run(self):
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try:
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logger.debug('Starting CloudWatch sender process.')
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connection = boto.connect_cloudwatch(self._aws_access_key, self._aws_secret_key)
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except:
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logger.exception('Failed to connect to CloudWatch.')
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self._metrics.enable_deprecated()
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while True:
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metrics = {
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'name': [],
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'value': [],
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'unit': [],
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'timestamp': [],
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'dimensions': [],
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}
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metric = self._metrics.get_deprecated()
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append_metric(metrics, metric)
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while len(metrics['name']) < MAX_BATCH_METRICS:
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try:
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metric = self._metrics.get_nowait_deprecated()
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append_metric(metrics, metric)
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except Empty:
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break
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try:
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connection.put_metric_data(self._namespace, **metrics)
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logger.debug('Sent %d CloudWatch metrics', len(metrics['name']))
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except:
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for i in range(len(metrics['name'])):
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self._metrics.put_deprecated(metrics['name'][i], metrics['value'][i],
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unit=metrics['unit'][i],
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dimensions=metrics['dimensions'][i],
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timestamp=metrics['timestamp'][i],
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)
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logger.exception('Failed to write to CloudWatch: %s', metrics)
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logger.debug('Attempted to requeue %d metrics.', len(metrics['name']))
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# random int between 1/2 and 1 1/2 of FAILED_SEND_SLEEP duration
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sleep_secs = random.randint(FAILED_SEND_SLEEP_SECS/2, 3*FAILED_SEND_SLEEP_SECS/2)
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time.sleep(sleep_secs)
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def append_metric(metrics, m):
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name, value, kwargs = m
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metrics['name'].append(name)
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metrics['value'].append(value)
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metrics['unit'].append(kwargs.get('unit'))
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metrics['dimensions'].append(kwargs.get('dimensions'))
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metrics['timestamp'].append(kwargs.get('timestamp'))
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