http.py
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http.py
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	# -------------------------------------------------------------
	# Platform checks
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	# Project: Nasqueron
	# Description: Check if a HTTP resource is alive
	# and return expected HTTP status code.
	# License: BSD-2-Clause
	# -------------------------------------------------------------


	import requests
	from requests.exceptions import ConnectionError


	class HttpCheck:
	def __init__(self, service, check_type, url, expected_status_code=200):
	self.service = service
	self.check_type = check_type
	self.url = url

	self.can_connect = False
	self.connection_error = ""

	self.expected_status_code = expected_status_code

	self.status_code = None
	self.success = None

	def is_alive_check(self):
	return "_alive" in self.check_type

	def is_proxy_check(self):
	return self.check_type[-6:] == "_proxy"

	def perform(self):
	try:
	r = requests.head(self.url)
	except ConnectionError as e:
	self.success = False
	self.connection_error = str(e)
	return

	self.can_connect = True
	self.status_code = r.status_code
	self.success = r.status_code == self.expected_status_code

	if self.success and self.is_alive_check():
	r = requests.get(self.url)
	self.success = r.text.strip() == "ALIVE"

	def build_message(self):
	if self.success:
	message = [f"Service {self.service} healthy"]
	else:
	message = [f"Service {self.service} NOT healthy"]

	if not self.can_connect:
	message.append(self.connection_error)
	elif self.status_code != self.expected_status_code:
	message.append(f"HTTP {self.status_code}")
	else:
	message.append(f"Unexpected body content")

	if self.is_proxy_check():
	message.append("Checked at PROXY level")

	return " - ".join(message)

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