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#!/usr/bin/python
import os
import sys
sys.path.insert(0, os.path.join(os.environ['CHARM_DIR'], 'lib'))
from charmhelpers.core import (
hookenv,
host
)
from charmhelpers.contrib.templating.jinja import render
hooks = hookenv.Hooks()
log = hookenv.log
SERVICE = 'logstash-indexer'
BASEPATH = os.path.join(os.path.sep, 'opt', 'logstash')
@hooks.hook('client-relation-changed')
def rest_changed():
cache_hosts()
write_config()
host.service_restart(SERVICE) or host.service_start(SERVICE)
def write_config():
with open('host_cache', 'r') as f:
hosts = f.readlines()
opts = {'hosts': hosts[0].rstrip()}
out = os.path.join(BASEPATH, 'conf.d', 'output-elasticsearch.conf')
with open(out, 'w') as p:
p.write(render(os.path.basename(out), opts))
def cache_hosts():
host = hookenv.relation_get('host')
if not host:
log('No host received. Assuming nothing to do.')
sys.exit(0)
if not os.path.exists('host_cache'):
open('host_cache', 'a').close()
with open('host_cache', 'r') as f:
hosts = f.readlines()
if not host in hosts:
with open('host_cache', 'a') as f:
f.write('{}\n'.format(host))
if __name__ == "__main__":
# execute a hook based on the name the program is called by
hooks.execute(sys.argv)
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