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inventory.py
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inventory.py
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#!/usr/bin/env python3
#
# Ansible dynamic inventory for Rancher
#
import os
import sys
import argparse
import json
import configparser
import requests
# Path to rancher config file
cfg_file = 'inventory.ini'
# Connection timeout
connection_timeout = 60
# Expose connection data
show_connection_data = True
try:
import json
except ImportError:
import simplejson as json
class Inventory(object):
def __init__(self):
self.inventory = {}
self.read_cli_args()
# Called with `--list`.
if self.args.list:
self.inventory = self.rancher_inventory()
# Called with `--host [hostname]`
elif self.args.host:
# Not implemented, since we return _meta info `--list`.
self.inventory = self.empty_inventory()
# If no groups or vars are present, return an empty inventory.
else:
self.inventory = self.empty_inventory()
print(json.dumps(self.inventory))
# Get Rancher url and credentials from settings file
def __settings(self, cfg_file):
content = configparser.ConfigParser()
content.read(cfg_file)
return(content)
# Rancher API query
def __api_get(self, url, token, verify = True):
headers = {'Content-Type': 'application/json', 'Authorization': 'Bearer {0}'.format(token)}
response_cluster = requests.get(url, headers=headers, verify=bool(verify), timeout=connection_timeout)
if response_cluster.status_code == 200:
result = json.loads(response_cluster.content.decode('utf-8'))
return(result['data'])
else:
print('Error accessing {0}. HTTP status code {1}.'.format(url, response_cluster.status_code))
exit(255)
# Build Rancher inventory
def rancher_inventory(self):
config = self.__settings(cfg_file)
api_url = config['main']['rancher_url']
api_url_base = '{0}/v3'.format(api_url)
api_token = config['main']['rancher_token']
ssl_verify = config['main']['ssl_verify']
cluster_url = '{0}/clusters'.format(api_url_base)
cluster_data = self.__api_get(cluster_url, api_token, ssl_verify)
result = {}
result['_meta'] = {}
result['_meta']['hostvars'] = {}
if show_connection_data:
result['all'] = {}
result['all']['vars'] = {}
result['all']['vars']['api_url_base'] = api_url_base
# Process group and host data
for this_cluster in cluster_data:
cluster_id = this_cluster['id']
cluster_name = this_cluster['name']
result[cluster_name] = {}
result[cluster_name]['hosts'] = []
result[cluster_name]['vars'] = {}
host_url = '{0}/clusters/{1}/nodes'.format(api_url_base, cluster_id)
host_data = self.__api_get(host_url, api_token, ssl_verify)
# Host variables
for this_host in host_data:
try:
host_name = this_host['hostname']
except KeyError:
continue
result[cluster_name]['hosts'].append(host_name)
result['_meta']['hostvars'][host_name] = {}
result['_meta']['hostvars'][host_name]['roles'] = []
result['_meta']['hostvars'][host_name]['host_state'] = this_host['state']
result['_meta']['hostvars'][host_name]['host_id'] = this_host['id']
result['_meta']['hostvars'][host_name]['cluster_name'] = cluster_name
result['_meta']['hostvars'][host_name]['cluster_id'] = cluster_id
result['_meta']['hostvars'][host_name]['labels'] = []
result['_meta']['hostvars'][host_name]['labels'] = this_host['labels']
if 'node-role.kubernetes.io/controlplane' in this_host['labels']:
result['_meta']['hostvars'][host_name]['roles'].append("controlplane")
if 'node-role.kubernetes.io/worker' in this_host['labels']:
result['_meta']['hostvars'][host_name]['roles'].append("worker")
if 'node-role.kubernetes.io/etcd' in this_host['labels']:
result['_meta']['hostvars'][host_name]['roles'].append("etcd")
# Group component health state
try:
for this_component in this_cluster['componentStatuses']:
if 'controller-manager' in this_component['name'] or 'etcd' in this_component['name']:
component_id = '{0}_healthy'.format(this_component['name']).replace('-','_')
result[cluster_name]['vars'][component_id] = bool(this_component['conditions'][0]['status'])
except KeyError:
pass
# Group variables
group_vars = [
'description',
'driver',
'id',
'istioEnabled',
'nodeCount',
'state',
]
for this_var in group_vars:
result[cluster_name]['vars'][this_var] = this_cluster[this_var]
return result
# Empty inventory for testing.
def empty_inventory(self):
return {'_meta': {'hostvars': {}}}
# Read the command line args passed to the script.
def read_cli_args(self):
parser = argparse.ArgumentParser()
parser.add_argument('--list', action = 'store_true')
parser.add_argument('--host', action = 'store')
self.args = parser.parse_args()
#
# Main
#
# Get the inventory.
Inventory()