paas_docker.py
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	# -- coding: utf-8 --

	# -------------------------------------------------------------
	# Salt — PaaS Docker execution module
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	# Project: Nasqueron
	# Created: 2018-10-07
	# Description: Functions related to data format conversions
	# License: BSD-2-Clause
	# -------------------------------------------------------------


	def get_image(default_image, args):
	"""
	A function to output a pillar key in JSON.

	State Example::

	{% image = salt['paas_docker.get_image']("nasqueron/mysql", container) %}
	"""
	image = default_image

	if "image" in args:
	image = args["image"]

	if "version" in args:
	image += ":" + str(args["version"])

	return image


	def list_images():
	"""
	A function to get the list of images used on a Docker engine.

	Example:

	salt docker-002 paas_docker.list_images
	"""
	images = __pillar__.get("docker_images", [])

	# Workaround for a merge issue for lists:
	# Salt Tower concatenates them, a set will dedup them.
	return set(images)


	def get_subnets():
	"""
	A function to get the Docker subnets list.

	CLI Example:

	salt * paas_docker.get_subnets
	"""
	try:
	networks = __pillar__["docker_networks"]
	except KeyError:
	networks = {}

	# Defined Docker subnet
	subnets = [network["subnet"] for network in networks.values()]
	# Default Docker subnet
	subnets.append("172.17.0.0/16")

	return subnets


	def _get_containers():
	try:
	return __pillar__["docker_containers"]
	except KeyError:
	return {}


	def list_containers():
	"""
	A function to list all the containers provisionned on a Docker engine.

	This function uses the pillar docker_containers as authoritative source,
	so it documents the expected configuration, not the actual containers
	running. That allows to compare both states.

	CLI Example:

	salt * paas_docker.list_containers
	"""
	return [
	key
	for service, service_containers in _get_containers().items()
	for key in service_containers.keys()
	]


	# -------------------------------------------------------------
	# Nginx
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -


	def resolve_vhost_config_file(service, dir="roles/paas-docker/nginx/files/vhosts"):
	candidate = f"{dir}/{service}.conf"

	if __salt__["slsutil.file_exists"](candidate):
	return candidate

	return f"{dir}/_default.conf"


	# -------------------------------------------------------------
	# Monitoring
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -


	def _get_health_check_url(check_type, container, url):
	if check_type[-6:] == "_proxy":
	return f"https://{container['host']}{url}"

	return f"http://localhost:{container['app_port']}{url}"


	def get_health_checks():
	"""
	A function to get a dictionary with health checks
	for known containers to use with our monitoring.

	CLI Example:

	salt * paas_docker.get_health_checks
	"""
	containers = _get_containers()
	monitoring = __pillar__["docker_containers_monitoring"]

	return {
	check_type: {
	instance: _get_health_check_url(check_type, container, url)
	for service, url in monitoring[check_type].items()
	for instance, container in containers.get(service, {}).items()
	}
	for check_type in monitoring.keys()
	}


	# -------------------------------------------------------------
	# Format
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -


	def format_env_list(values, separator=",", assign_op="-"):
	return separator.join([f"{k}{assign_op}{v}" for k, v in values.items()])

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