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Dynamic inventory for Packet host (https://packet.net) (#20635)

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* Add dynamic inventory script and config for Packet.net

* The script and config have been shamelessly cargo
  culted from the `ec2.py` and `ec2.ini` dynamic inventory
  script.
* This is an initial version and could very well be
  enhanced and made better.

Examples:

`PACKET_NET_API_KEY=<MY_AUTH_TOKEN> --list` to get inventory for
all hosts in Packet.net in all projects (defaults to `--list`
if no argument provided).

`PACKET_NET_API_KEY=<MY_AUTH_TOKEN> --host HOST` to get variables
for a single host.

* improvements in Packet host dynamic inventory
This commit is contained in:
Tomáš Karásek 2017-02-06 11:56:17 +02:00 committed by John R Barker
parent 62434d9955
commit db8fd95d68
2 changed files with 550 additions and 0 deletions
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52
contrib/inventory/packet_net.ini Normal file
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# Ansible Packet.net external inventory script settings
#
[packet]
# Packet projects to get info for. Set this to 'all' to get info for all
# projects in Packet and merge the results together. Alternatively, set
# this to a comma separated list of projects. E.g. 'project-1,project-3,project-4'
projects = all
projects_exclude =
# By default, packet devices in all state are returned. Specify
# packet device states to return as a comma-separated list.
# device_states = active, inactive, queued, provisioning
# items per page to retrieve from packet api at a time
items_per_page = 999
# API calls to Packet are costly. For this reason, we cache the results of an API
# call. Set this to the path you want cache files to be written to. Two files
# will be written to this directory:
# - ansible-packet.cache
# - ansible-packet.index
cache_path = ~/.ansible/tmp
# The number of seconds a cache file is considered valid. After this many
# seconds, a new API call will be made, and the cache file will be updated.
# To disable the cache, set this value to 0
cache_max_age = 300
# Organize groups into a nested/hierarchy instead of a flat namespace.
nested_groups = False
# Replace - tags when creating groups to avoid issues with ansible
replace_dash_in_groups = True
# The packet inventory output can become very large. To manage its size,
# configure which groups should be created.
group_by_device_id = True
group_by_facility = True
group_by_project = True
group_by_operating_system = True
group_by_plan_type = True
group_by_tags = True
group_by_tag_none = True
# If you only want to include hosts that match a certain regular expression
# pattern_include = staging-*
# If you want to exclude any hosts that match a certain regular expression
# pattern_exclude = staging-*

498
contrib/inventory/packet_net.py Executable file
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#!/usr/bin/env python
'''
Packet.net external inventory script
=================================
Generates inventory that Ansible can understand by making API request to
Packet.net using the Packet library.
NOTE: This script assumes Ansible is being executed where the environment
variable needed for Packet API Token already been set:
export PACKET_API_TOKEN=Bfse9F24SFtfs423Gsd3ifGsd43sSdfs
This script also assumes there is a packet_net.ini file alongside it. To specify a
different path to packet_net.ini, define the PACKET_NET_INI_PATH environment variable:
export PACKET_NET_INI_PATH=/path/to/my_packet_net.ini
'''
# (c) 2016, Peter Sankauskas
# (c) 2017, Tomas Karasek
#
# This file is part of Ansible,
#
# Ansible 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 Ansible. If not, see <http://www.gnu.org/licenses/>.
######################################################################
import sys
import os
import argparse
import re
from time import time
import six
from six.moves import configparser
try:
import packet
except ImportError as e:
sys.exit("failed=True msg='`packet-python` library required for this script'")
import traceback
try:
import json
except ImportError:
import simplejson as json
ini_section = 'packet'
class PacketInventory(object):
def _empty_inventory(self):
return {"_meta" : {"hostvars" : {}}}
def __init__(self):
''' Main execution path '''
# Inventory grouped by device IDs, tags, security groups, regions,
# and availability zones
self.inventory = self._empty_inventory()
# Index of hostname (address) to device ID
self.index = {}
# Read settings and parse CLI arguments
self.parse_cli_args()
self.read_settings()
# Cache
if self.args.refresh_cache:
self.do_api_calls_update_cache()
elif not self.is_cache_valid():
self.do_api_calls_update_cache()
# Data to print
if self.args.host:
data_to_print = self.get_host_info()
elif self.args.list:
# Display list of devices for inventory
if self.inventory == self._empty_inventory():
data_to_print = self.get_inventory_from_cache()
else:
data_to_print = self.json_format_dict(self.inventory, True)
print(data_to_print)
def is_cache_valid(self):
''' Determines if the cache files have expired, or if it 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_index):
return True
return False
def read_settings(self):
''' Reads the settings from the packet_net.ini file '''
if six.PY3:
config = configparser.ConfigParser()
else:
config = configparser.SafeConfigParser()
_ini_path_raw = os.environ.get('PACKET_NET_INI_PATH')
if _ini_path_raw:
packet_ini_path = os.path.expanduser(os.path.expandvars(_ini_path_raw))
else:
packet_ini_path = os.path.join(os.path.dirname(os.path.realpath(__file__)), 'packet_net.ini')
config.read(packet_ini_path)
# items per page
self.items_per_page = 999
if config.has_option(ini_section, 'items_per_page'):
config.get(ini_section, 'items_per_page')
# Instance states to be gathered in inventory. Default is all of them.
packet_valid_device_states = [
'active',
'inactive',
'queued',
'provisioning'
]
self.packet_device_states = []
if config.has_option(ini_section, 'device_states'):
for device_state in config.get(ini_section, 'device_states').split(','):
device_state = device_state.strip()
if device_state not in packet_valid_device_states:
continue
self.packet_device_states.append(device_state)
else:
self.packet_device_states = packet_valid_device_states
# Cache related
cache_dir = os.path.expanduser(config.get(ini_section, 'cache_path'))
if not os.path.exists(cache_dir):
os.makedirs(cache_dir)
self.cache_path_cache = cache_dir + "/ansible-packet.cache"
self.cache_path_index = cache_dir + "/ansible-packet.index"
self.cache_max_age = config.getint(ini_section, 'cache_max_age')
# Configure nested groups instead of flat namespace.
if config.has_option(ini_section, 'nested_groups'):
self.nested_groups = config.getboolean(ini_section, 'nested_groups')
else:
self.nested_groups = False
# Replace dash or not in group names
if config.has_option(ini_section, 'replace_dash_in_groups'):
self.replace_dash_in_groups = config.getboolean(ini_section, 'replace_dash_in_groups')
else:
self.replace_dash_in_groups = True
# Configure which groups should be created.
group_by_options = [
'group_by_device_id',
'group_by_facility',
'group_by_project',
'group_by_operating_system',
'group_by_plan_type',
'group_by_tags',
'group_by_tag_none',
]
for option in group_by_options:
if config.has_option(ini_section, option):
setattr(self, option, config.getboolean(ini_section, option))
else:
setattr(self, option, True)
# Do we need to just include hosts that match a pattern?
try:
pattern_include = config.get(ini_section, 'pattern_include')
if pattern_include and len(pattern_include) > 0:
self.pattern_include = re.compile(pattern_include)
else:
self.pattern_include = None
except configparser.NoOptionError:
self.pattern_include = None
# Do we need to exclude hosts that match a pattern?
try:
pattern_exclude = config.get(ini_section, 'pattern_exclude');
if pattern_exclude and len(pattern_exclude) > 0:
self.pattern_exclude = re.compile(pattern_exclude)
else:
self.pattern_exclude = None
except configparser.NoOptionError:
self.pattern_exclude = None
# Projects
self.projects = []
configProjects = config.get(ini_section, 'projects')
configProjects_exclude = config.get(ini_section, 'projects_exclude')
if (configProjects == 'all'):
for projectInfo in self.get_projects():
if projectInfo.name not in configProjects_exclude:
self.projects.append(projectInfo.name)
else:
self.projects = configProjects.split(",")
def parse_cli_args(self):
''' Command line argument processing '''
parser = argparse.ArgumentParser(description='Produce an Ansible Inventory file based on Packet')
parser.add_argument('--list', action='store_true', default=True,
help='List Devices (default: True)')
parser.add_argument('--host', action='store',
help='Get all the variables about a specific device')
parser.add_argument('--refresh-cache', action='store_true', default=False,
help='Force refresh of cache by making API requests to Packet (default: False - use cache files)')
self.args = parser.parse_args()
def do_api_calls_update_cache(self):
''' Do API calls to each region, and save data in cache files '''
for projectInfo in self.get_projects():
if projectInfo.name in self.projects:
self.get_devices_by_project(projectInfo)
self.write_to_cache(self.inventory, self.cache_path_cache)
self.write_to_cache(self.index, self.cache_path_index)
def connect(self):
''' create connection to api server'''
token=os.environ.get('PACKET_API_TOKEN')
if token is None:
raise Exception("Error reading token from environment (PACKET_API_TOKEN)!")
manager = packet.Manager(auth_token=token)
return manager
def get_projects(self):
'''Makes a Packet API call to get the list of projects'''
try:
manager = self.connect()
projects = manager.list_projects()
return projects
except Exception as e:
traceback.print_exc()
self.fail_with_error(e, 'getting Packet projects')
def get_devices_by_project(self, project):
''' Makes an Packet API call to the list of devices in a particular
project '''
params = {
'per_page': self.items_per_page
}
try:
manager = self.connect()
devices = manager.list_devices(project_id=project.id, params = params)
for device in devices:
self.add_device(device, project)
except Exception as e:
traceback.print_exc()
self.fail_with_error(e, 'getting Packet devices')
def fail_with_error(self, err_msg, err_operation=None):
'''log an error to std err for ansible-playbook to consume and exit'''
if err_operation:
err_msg = 'ERROR: "{err_msg}", while: {err_operation}\n'.format(
err_msg=err_msg, err_operation=err_operation)
sys.stderr.write(err_msg)
sys.exit(1)
def get_device(self, device_id):
manager = self.connect()
device = manager.get_device(device_id)
return device
def add_device(self, device, project):
''' Adds a device to the inventory and index, as long as it is
addressable '''
# Only return devices with desired device states
if device.state not in self.packet_device_states:
return
# Select the best destination address
dest = None
for ip_address in device.ip_addresses:
if ip_address['public'] == True and ip_address['address_family'] == 4:
dest = ip_address['address']
if not dest:
# Skip devices we cannot address (e.g. private VPC subnet)
return
# if we only want to include hosts that match a pattern, skip those that don't
if self.pattern_include and not self.pattern_include.match(device.hostname):
return
# if we need to exclude hosts that match a pattern, skip those
if self.pattern_exclude and self.pattern_exclude.match(device.hostname):
return
# Add to index
self.index[dest] = [project.id, device.id]
# Inventory: Group by device ID (always a group of 1)
if self.group_by_device_id:
self.inventory[device.id] = [dest]
if self.nested_groups:
self.push_group(self.inventory, 'devices', device.id)
# Inventory: Group by project
if self.group_by_project:
self.push(self.inventory, project.name, dest)
if self.nested_groups:
self.push_group(self.inventory, 'projects', project.name)
# Inventory: Group by facility
if self.group_by_facility:
self.push(self.inventory, device.facility['code'], dest)
if self.nested_groups:
if self.group_by_facility:
self.push_group(self.inventory, project.name, device.facility['code'])
# Inventory: Group by OS
if self.group_by_operating_system:
self.push(self.inventory, device.operating_system.slug, dest)
if self.nested_groups:
self.push_group(self.inventory, 'operating_systems', device.operating_system.slug)
# Inventory: Group by plan type
if self.group_by_plan_type:
self.push(self.inventory, device.plan['slug'], dest)
if self.nested_groups:
self.push_group(self.inventory, 'plans', device.plan['slug'])
# Inventory: Group by tag keys
if self.group_by_tags:
for k in device.tags:
key = self.to_safe("tag_" + k)
self.push(self.inventory, key, dest)
if self.nested_groups:
self.push_group(self.inventory, 'tags', self.to_safe("tag_" + k))
# Global Tag: devices without tags
if self.group_by_tag_none and len(device.tags) == 0:
self.push(self.inventory, 'tag_none', dest)
if self.nested_groups:
self.push_group(self.inventory, 'tags', 'tag_none')
# Global Tag: tag all Packet devices
self.push(self.inventory, 'packet', dest)
self.inventory["_meta"]["hostvars"][dest] = self.get_host_info_dict_from_device(device)
def get_host_info_dict_from_device(self, device):
device_vars = {}
for key in vars(device):
value = getattr(device, key)
key = self.to_safe('packet_' + key)
# Handle complex types
if key == 'packet_state':
device_vars[key] = device.state or ''
elif key == 'packet_hostname':
device_vars[key] = value
elif type(value) in [int, bool]:
device_vars[key] = value
elif isinstance(value, six.string_types):
device_vars[key] = value.strip()
elif type(value) == type(None):
device_vars[key] = ''
elif key == 'packet_facility':
device_vars[key] = value['code']
elif key == 'packet_operating_system':
device_vars[key] = value.slug
elif key == 'packet_plan':
device_vars[key] = value['slug']
elif key == 'packet_tags':
for k in value:
key = self.to_safe('packet_tag_' + k)
device_vars[key] = k
else:
pass
#print key
#print type(value)
#print value
return device_vars
def get_host_info(self):
''' Get variables about a specific host '''
if len(self.index) == 0:
# Need to load index from cache
self.load_index_from_cache()
if not self.args.host in self.index:
# try updating the cache
self.do_api_calls_update_cache()
if not self.args.host in self.index:
# host might not exist anymore
return self.json_format_dict({}, True)
(project_id, device_id) = self.index[self.args.host]
device = self.get_device(device_id)
return self.json_format_dict(self.get_host_info_dict_from_device(device), True)
def push(self, my_dict, key, element):
''' Push an element onto an array that may not have been defined in
the dict '''
group_info = my_dict.setdefault(key, [])
if isinstance(group_info, dict):
host_list = group_info.setdefault('hosts', [])
host_list.append(element)
else:
group_info.append(element)
def push_group(self, my_dict, key, element):
''' Push a group as a child of another group. '''
parent_group = my_dict.setdefault(key, {})
if not isinstance(parent_group, dict):
parent_group = my_dict[key] = {'hosts': parent_group}
child_groups = parent_group.setdefault('children', [])
if element not in child_groups:
child_groups.append(element)
def get_inventory_from_cache(self):
''' Reads the inventory from the cache file and returns it as a JSON
object '''
cache = open(self.cache_path_cache, 'r')
json_inventory = cache.read()
return json_inventory
def load_index_from_cache(self):
''' Reads the index from the cache file sets self.index '''
cache = open(self.cache_path_index, 'r')
json_index = cache.read()
self.index = json.loads(json_index)
def write_to_cache(self, data, filename):
''' Writes data in JSON format to a file '''
json_data = self.json_format_dict(data, True)
cache = open(filename, 'w')
cache.write(json_data)
cache.close()
def uncammelize(self, key):
temp = re.sub('(.)([A-Z][a-z]+)', r'\1_\2', key)
return re.sub('([a-z0-9])([A-Z])', r'\1_\2', temp).lower()
def to_safe(self, word):
''' Converts 'bad' characters in a string to underscores so they can be used as Ansible groups '''
regex = "[^A-Za-z0-9\_"
if not self.replace_dash_in_groups:
regex += "\-"
return re.sub(regex + "]", "_", word)
def json_format_dict(self, 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)
# Run the script
PacketInventory()