cw-monitor-redis-connections.py

#!/usr/bin/env python
'''
Send Redis connection metrics to Amazon CloudWatch
'''

import sys
import re
from subprocess import check_output
from boto.ec2 import cloudwatch
from boto.utils import get_instance_metadata

def collect_redis_connections():
  conninfo = {}
  connections = check_output('redis-cli client list | wc -l', shell=True).rstrip()
  return connections

def send_metric(instance_id, region, key, value, namespace='Redis', unit='Count'):
  cw = cloudwatch.connect_to_region(region)
  cw.put_metric_data(namespace, key, value, unit=unit,
                     dimensions={"InstanceId": instance_id})

if __name__ == '__main__':
  metadata = get_instance_metadata()
  instance_id = metadata['instance-id']
  region = metadata['placement']['availability-zone'][0:-1]
  connections = collect_redis_connections()
  send_metric(instance_id, region, 'Connections', connections)