Monitor packet loss to a particular host and send statistics to Cloudwatch

pingmon.py

import threading
import time
import logging

logging.basicConfig(level=logging.INFO, format='[%(levelname)s %(asctime)s %(name)s] %(message)s')
logger = logging.getLogger('pingmon')
logger.setLevel(logging.INFO)

import boto3

from pythonping.executor import Communicator

target = '8.8.4.4'
timeout = 1

client = Communicator(target, None, timeout)

seq = 1
identifier = client.seed_id
attempts = 0
lost = 0
dump_requested = False

session = boto3.Session(profile_name='monitoring')

cloudwatch = session.client('cloudwatch')


def monitor():
    global attempts
    global lost
    while True:
        time.sleep(60)
        loss = round(100 * lost / attempts)
        logger.info('{} packets sent {} packets lost {}% packet loss'.format(attempts, lost, loss))
        attempts = 0
        lost = 0
        cloudwatch.put_metric_data(
            MetricData=[
                {
                    'MetricName': 'PacketLoss',
                    'Unit': 'Percent',
                    'Value': loss
                },
            ], Namespace='Home')


thread = threading.Thread(target=monitor, args=())
thread.daemon = True
thread.start()

logger.info('pingmon is monitoring {}'.format(target))

while True:
    attempts += 1
    client.send_ping(client.seed_id, seq, b'a')
    res = client.listen_for(identifier, timeout)
    if not res.message:
        lost += 1
    seq = client.increase_seq(seq)
    time.sleep(1)

Ping a host every second. Every minute send packet loss percentage metric to Amazon CloudWatch.

I wrote the script so that I could monitor my upstream internet connection via Raspberry Pi. Sending to Cloudwatch meant that I did not need to log the data to disk and worry about wearing out my SD card.