Change health check to generate its URL

[tcely]

We have environment variables for where gunicorn is listening, so we should use those to generate the proper URL instead of using a hard-coded argument in the Dockerfile.

I'd suggest instead of an error, we should format a string as the URL instead. This preserves the ability to override the URL with an argument but uses the generated one by default.

tubesync/tubesync/healthcheck.py

Lines 38 to 42 in 33479e8

	try:
	url = sys.argv[1]
	except IndexError:
	sys.stderr.write('URL must be supplied\n')
	sys.exit(1)

tubesync/tubesync/tubesync/gunicorn.py

Lines 19 to 24 in 33479e8

	def get_bind():
	host = os.getenv('LISTEN_HOST', '127.0.0.1')
	port = os.getenv('LISTEN_PORT', '8080')
	return '{}:{}'.format(host, port)

tubesync/Dockerfile

Lines 776 to 778 in 33479e8

	# Create a healthcheck
	HEALTHCHECK --interval=1m --timeout=10s --start-period=3m CMD ["/app/healthcheck.py", "http://127.0.0.1:8080/healthcheck"]