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Add Foreman inventory (#19510)

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This commit adds the foreman inventory based on
https://github.com/theforeman/foreman_ansible_inventory
and its configuration file.
This commit is contained in:
Daniel Lobato García 2017-02-21 18:21:22 +01:00 • committed by Toshio Kuratomi
commit 01436cf186
2 changed files with 501 additions and 0 deletions
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122
contrib/inventory/foreman.ini Normal file
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# Foreman inventory (https://github.com/theforeman/foreman_ansible_inventory)
#
# This script can be used as an Ansible dynamic inventory.
# The connection parameters are set up via *foreman.ini*
# This is how the script founds the configuration file in
# order of discovery.
#
# * `/etc/ansible/foreman.ini`
# * Current directory of your inventory script.
# * `FOREMAN_INI_PATH` environment variable.
#
# ## Variables and Parameters
#
# The data returned from Foreman for each host is stored in a foreman
# hash so they're available as *host_vars* along with the parameters
# of the host and it's hostgroups:
#
# "foo.example.com": {
# "foreman": {
# "architecture_id": 1,
# "architecture_name": "x86_64",
# "build": false,
# "build_status": 0,
# "build_status_label": "Installed",
# "capabilities": [
# "build",
# "image"
# ],
# "compute_profile_id": 4,
# "hostgroup_name": "webtier/myapp",
# "id": 70,
# "image_name": "debian8.1",
# ...
# "uuid": "50197c10-5ebb-b5cf-b384-a1e203e19e77"
# },
# "foreman_params": {
# "testparam1": "foobar",
# "testparam2": "small",
# ...
# }
#
# and could therefore be used in Ansible like:
#
# - debug: msg="From Foreman host {{ foreman['uuid'] }}"
#
# Which yields
#
# TASK [test_foreman : debug] ****************************************************
# ok: [foo.example.com] => {
# "msg": "From Foreman host 50190bd1-052a-a34a-3c9c-df37a39550bf"
# }
#
# ## Automatic Ansible groups
#
# The inventory will provide a set of groups, by default prefixed by
# 'foreman_'. If you want to customize this prefix, change the
# group_prefix option in /etc/ansible/foreman.ini. The rest of this
# guide will assume the default prefix of 'foreman'
#
# The hostgroup, location, organization, content view, and lifecycle
# environment of each host are created as Ansible groups with a
# foreman_<grouptype> prefix, all lowercase and problematic parameters
# removed. So e.g. the foreman hostgroup
#
# myapp / webtier / datacenter1
#
# would turn into the Ansible group:
#
# foreman_hostgroup_myapp_webtier_datacenter1
#
# Furthermore Ansible groups can be created on the fly using the
# *group_patterns* variable in *foreman.ini* so that you can build up
# hierarchies using parameters on the hostgroup and host variables.
#
# Lets assume you have a host that is built using this nested hostgroup:
#
# myapp / webtier / datacenter1
#
# and each of the hostgroups defines a parameters respectively:
#
# myapp: app_param = myapp
# webtier: tier_param = webtier
# datacenter1: dc_param = datacenter1
#
# The host is also in a subnet called "mysubnet" and provisioned via an image
# then *group_patterns* like:
#
# [ansible]
# group_patterns = ["{app_param}-{tier_param}-{dc_param}",
# "{app_param}-{tier_param}",
# "{app_param}",
# "{subnet_name}-{provision_method}"]
#
# would put the host into the additional Ansible groups:
#
# - myapp-webtier-datacenter1
# - myapp-webtier
# - myapp
# - mysubnet-image
#
# by recursively resolving the hostgroups, getting the parameter keys
# and values and doing a Python *string.format()* like replacement on
# it.
#
[foreman]
url = http://localhost:3000/
user = foreman
password = secret
ssl_verify = True
[ansible]
group_patterns = ["{app}-{tier}-{color}",
"{app}-{color}",
"{app}",
"{tier}"]
group_prefix = foreman_
# Whether to fetch facts from Foreman and store them on the host
want_facts = True
[cache]
path = .
max_age = 60

379
contrib/inventory/foreman.py Executable file
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#!/usr/bin/env python
# vim: set fileencoding=utf-8 :
#
# Copyright (C) 2016 Guido Günther <agx@sigxcpu.org>,
# Daniel Lobato Garcia <dlobatog@redhat.com>
#
# This script is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with it. If not, see <http://www.gnu.org/licenses/>.
#
# This is somewhat based on cobbler inventory
# Stdlib imports
# __future__ imports must occur at the beginning of file
from __future__ import print_function
try:
# Python 2 version
import ConfigParser
except ImportError:
# Python 3 version
import configparser as ConfigParser
import json
import argparse
import copy
import os
import re
import sys
from time import time
from collections import defaultdict
from distutils.version import LooseVersion, StrictVersion
# 3rd party imports
import requests
if LooseVersion(requests.__version__) < LooseVersion('1.1.0'):
print('This script requires python-requests 1.1 as a minimum version')
sys.exit(1)
from requests.auth import HTTPBasicAuth
def json_format_dict(data, pretty=False):
"""Converts a dict to a JSON object and dumps it as a formatted string"""
if pretty:
return json.dumps(data, sort_keys=True, indent=2)
else:
return json.dumps(data)
class ForemanInventory(object):
def __init__(self):
self.inventory = defaultdict(list) # A list of groups and the hosts in that group
self.cache = dict() # Details about hosts in the inventory
self.params = dict() # Params of each host
self.facts = dict() # Facts of each host
self.hostgroups = dict() # host groups
self.session = None # Requests session
self.config_paths = [
"/etc/ansible/foreman.ini",
os.path.dirname(os.path.realpath(__file__)) + '/foreman.ini',
]
env_value = os.environ.get('FOREMAN_INI_PATH')
if env_value is not None:
self.config_paths.append(os.path.expanduser(os.path.expandvars(env_value)))
def read_settings(self):
"""Reads the settings from the foreman.ini file"""
config = ConfigParser.SafeConfigParser()
config.read(self.config_paths)
# Foreman API related
try:
self.foreman_url = config.get('foreman', 'url')
self.foreman_user = config.get('foreman', 'user')
self.foreman_pw = config.get('foreman', 'password')
self.foreman_ssl_verify = config.getboolean('foreman', 'ssl_verify')
except (ConfigParser.NoOptionError, ConfigParser.NoSectionError) as e:
print("Error parsing configuration: %s" % e, file=sys.stderr)
return False
# Ansible related
try:
group_patterns = config.get('ansible', 'group_patterns')
except (ConfigParser.NoOptionError, ConfigParser.NoSectionError):
group_patterns = "[]"
self.group_patterns = json.loads(group_patterns)
try:
self.group_prefix = config.get('ansible', 'group_prefix')
except (ConfigParser.NoOptionError, ConfigParser.NoSectionError):
self.group_prefix = "foreman_"
try:
self.want_facts = config.getboolean('ansible', 'want_facts')
except (ConfigParser.NoOptionError, ConfigParser.NoSectionError):
self.want_facts = True
# Cache related
try:
cache_path = os.path.expanduser(config.get('cache', 'path'))
except (ConfigParser.NoOptionError, ConfigParser.NoSectionError):
cache_path = '.'
(script, ext) = os.path.splitext(os.path.basename(__file__))
self.cache_path_cache = cache_path + "/%s.cache" % script
self.cache_path_inventory = cache_path + "/%s.index" % script
self.cache_path_params = cache_path + "/%s.params" % script
self.cache_path_facts = cache_path + "/%s.facts" % script
try:
self.cache_max_age = config.getint('cache', 'max_age')
except (ConfigParser.NoOptionError, ConfigParser.NoSectionError):
self.cache_max_age = 60
return True
def parse_cli_args(self):
"""Command line argument processing"""
parser = argparse.ArgumentParser(description='Produce an Ansible Inventory file based on foreman')
parser.add_argument('--list', action='store_true', default=True, help='List instances (default: True)')
parser.add_argument('--host', action='store', help='Get all the variables about a specific instance')
parser.add_argument('--refresh-cache', action='store_true', default=False,
help='Force refresh of cache by making API requests to foreman (default: False - use cache files)')
self.args = parser.parse_args()
def _get_session(self):
if not self.session:
self.session = requests.session()
self.session.auth = HTTPBasicAuth(self.foreman_user, self.foreman_pw)
self.session.verify = self.foreman_ssl_verify
return self.session
def _get_json(self, url, ignore_errors=None):
page = 1
results = []
s = self._get_session()
while True:
ret = s.get(url, params={'page': page, 'per_page': 250})
if ignore_errors and ret.status_code in ignore_errors:
break
ret.raise_for_status()
json = ret.json()
# /hosts/:id has not results key
if 'results' not in json:
return json
# Facts are returned as dict in results not list
if isinstance(json['results'], dict):
return json['results']
# List of all hosts is returned paginaged
results = results + json['results']
if len(results) >= json['total']:
break
page += 1
if len(json['results']) == 0:
print("Did not make any progress during loop. "
"expected %d got %d" % (json['total'], len(results)),
file=sys.stderr)
break
return results
def _get_hosts(self):
return self._get_json("%s/api/v2/hosts" % self.foreman_url)
def _get_all_params_by_id(self, hid):
url = "%s/api/v2/hosts/%s" % (self.foreman_url, hid)
ret = self._get_json(url, [404])
if ret == []:
ret = {}
return ret.get('all_parameters', {})
def _resolve_params(self, host):
"""Fetch host params and convert to dict"""
params = {}
for param in self._get_all_params_by_id(host['id']):
name = param['name']
params[name] = param['value']
return params
def _get_facts_by_id(self, hid):
url = "%s/api/v2/hosts/%s/facts" % (self.foreman_url, hid)
return self._get_json(url)
def _get_facts(self, host):
"""Fetch all host facts of the host"""
if not self.want_facts:
return {}
ret = self._get_facts_by_id(host['id'])
if len(ret.values()) == 0:
facts = {}
elif len(ret.values()) == 1:
facts = list(ret.values())[0]
else:
raise ValueError("More than one set of facts returned for '%s'" % host)
return facts
def write_to_cache(self, data, filename):
"""Write data in JSON format to a file"""
json_data = json_format_dict(data, True)
cache = open(filename, 'w')
cache.write(json_data)
cache.close()
def _write_cache(self):
self.write_to_cache(self.cache, self.cache_path_cache)
self.write_to_cache(self.inventory, self.cache_path_inventory)
self.write_to_cache(self.params, self.cache_path_params)
self.write_to_cache(self.facts, self.cache_path_facts)
def to_safe(self, word):
'''Converts 'bad' characters in a string to underscores
so they can be used as Ansible groups
>>> ForemanInventory.to_safe("foo-bar baz")
'foo_barbaz'
'''
regex = "[^A-Za-z0-9\_]"
return re.sub(regex, "_", word.replace(" ", ""))
def update_cache(self):
"""Make calls to foreman and save the output in a cache"""
self.groups = dict()
self.hosts = dict()
for host in self._get_hosts():
dns_name = host['name']
# Create ansible groups for hostgroup
group = 'hostgroup'
val = host.get('%s_title' % group) or host.get('%s_name' % group)
if val:
safe_key = self.to_safe('%s%s_%s' % (self.group_prefix, group, val.lower()))
self.inventory[safe_key].append(dns_name)
# Create ansible groups for environment, location and organization
for group in ['environment', 'location', 'organization']:
val = host.get('%s_name' % group)
if val:
safe_key = self.to_safe('%s%s_%s' % (self.group_prefix, group, val.lower()))
self.inventory[safe_key].append(dns_name)
for group in ['lifecycle_environment', 'content_view']:
val = host.get('content_facet_attributes', {}).get('%s_name' % group)
if val:
safe_key = self.to_safe('%s%s_%s' % (self.group_prefix, group, val.lower()))
self.inventory[safe_key].append(dns_name)
params = self._resolve_params(host)
# Ansible groups by parameters in host groups and Foreman host
# attributes.
groupby = copy.copy(params)
for k, v in host.items():
if isinstance(v, str):
groupby[k] = self.to_safe(v)
elif isinstance(v, int):
groupby[k] = v
# The name of the ansible groups is given by group_patterns:
for pattern in self.group_patterns:
try:
key = pattern.format(**groupby)
self.inventory[key].append(dns_name)
except KeyError:
pass # Host not part of this group
self.cache[dns_name] = host
self.params[dns_name] = params
self.facts[dns_name] = self._get_facts(host)
self.inventory['all'].append(dns_name)
self._write_cache()
def is_cache_valid(self):
"""Determines if the cache is still valid"""
if os.path.isfile(self.cache_path_cache):
mod_time = os.path.getmtime(self.cache_path_cache)
current_time = time()
if (mod_time + self.cache_max_age) > current_time:
if (os.path.isfile(self.cache_path_inventory) and
os.path.isfile(self.cache_path_params) and
os.path.isfile(self.cache_path_facts)):
return True
return False
def load_inventory_from_cache(self):
"""Read the index from the cache file sets self.index"""
cache = open(self.cache_path_inventory, 'r')
json_inventory = cache.read()
self.inventory = json.loads(json_inventory)
def load_params_from_cache(self):
"""Read the index from the cache file sets self.index"""
cache = open(self.cache_path_params, 'r')
json_params = cache.read()
self.params = json.loads(json_params)
def load_facts_from_cache(self):
"""Read the index from the cache file sets self.facts"""
if not self.want_facts:
return
cache = open(self.cache_path_facts, 'r')
json_facts = cache.read()
self.facts = json.loads(json_facts)
def load_cache_from_cache(self):
"""Read the cache from the cache file sets self.cache"""
cache = open(self.cache_path_cache, 'r')
json_cache = cache.read()
self.cache = json.loads(json_cache)
def get_inventory(self):
if self.args.refresh_cache or not self.is_cache_valid():
self.update_cache()
else:
self.load_inventory_from_cache()
self.load_params_from_cache()
self.load_facts_from_cache()
self.load_cache_from_cache()
def get_host_info(self):
"""Get variables about a specific host"""
if not self.cache or len(self.cache) == 0:
# Need to load index from cache
self.load_cache_from_cache()
if self.args.host not in self.cache:
# try updating the cache
self.update_cache()
if self.args.host not in self.cache:
# host might not exist anymore
return json_format_dict({}, True)
return json_format_dict(self.cache[self.args.host], True)
def _print_data(self):
data_to_print = ""
if self.args.host:
data_to_print += self.get_host_info()
else:
self.inventory['_meta'] = {'hostvars': {}}
for hostname in self.cache:
self.inventory['_meta']['hostvars'][hostname] = {
'foreman': self.cache[hostname],
'foreman_params': self.params[hostname],
}
if self.want_facts:
self.inventory['_meta']['hostvars'][hostname]['foreman_facts'] = self.facts[hostname]
data_to_print += json_format_dict(self.inventory, True)
print(data_to_print)
def run(self):
# Read settings and parse CLI arguments
if not self.read_settings():
return False
self.parse_cli_args()
self.get_inventory()
self._print_data()
return True
if __name__ == '__main__':
sys.exit(not ForemanInventory().run())