cluster_metadata.sls

import subprocess
import json

from minion_metadata import minion_metadata

def cluster_metadata():
	'''
	main_ip - the private_ip of the main machine with same idx as this machine
	main_ips - the private_ips of all main machines
	'''

	def get_ips(query):
		main_ip = subprocess.check_output(
			["salt-call", "mine.get", query_main_ip, "private_ip", "expr_form=compound", "--output=json"]
		)
		main_ip = json.loads(main_ip)['data'].values()
		return main_ip

	mmd = minion_metadata()

	query_main_ip = "'G@env:{} and G@role:main and G@idx:{}'".format(mmd['env'], mmd['idx'])
	query_main_ips = "'G@env:{} and G@role:main'".format(mmd['env'])

	return {
		'main_ip': get_ips(query_main_ip)[0],
		'main_ips': get_ips(query_main_ips)
	}

error

The above custom grain causes non-stop calls to:

/usr/bin/python /usr/bin/salt-call mine.get "<query>" private_ip expr_form=compound --output=json

I would expect/hope that when the grain is executed the mine.get call will also be executed only once.

Does the mine.get itself invoke a refresh of the grains?