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5f63b3a7bb
* chore: drop deprecated tables and remove unused code * isort imports * migration: check for table existence before drop
106 lines
3.3 KiB
Python
106 lines
3.3 KiB
Python
import logging
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import random
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import time
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from queue import Empty
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from threading import Thread
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import boto
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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
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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(
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metrics["name"][i],
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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(
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FAILED_SEND_SLEEP_SECS / 2, 3 * FAILED_SEND_SLEEP_SECS / 2
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)
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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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