import subprocess
import datetime
import time
import re
import sys
toolbar_width = 40
while True:
	try:
		output = subprocess.check_output(["ping", "-c 50", "-i 0.05", "google.ca"])
	except subprocess.CalledProcessError as e:
		if e.returncode == 2:
			# no responses received
			output = e.output
		else:
			print "error code " + str(e.returncode)
			print e.output
			if e.returncode == 68:
				time.sleep(2.5) # avoid flood of failed DNS requests
			continue

	match = re.search("([0-9]?[0-9]?[0-9]\.[0-9])% packet loss", output)
	if match:
		data = "{0}, {1}%".format(datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S"), match.group(1))
		loss = float(match.group(1))/100
		dots = int(round(loss * toolbar_width))
		spaces = toolbar_width - dots
		data = "{0},{1}[{2}{3}]".format(data, (" " * (5 - len(match.group(1)))), ("#" * dots), (" " * spaces))

		if loss > 1.18:
			print data,
			print '\a'
		else:
			print data

		with open("packet_loss_data.csv", "a") as outfile:
			outfile.write(data)
			outfile.write('\n')
			outfile.flush()