community.general/plugins/inventory/lxd.py

# -*- coding: utf-8 -*-
# Copyright (c) 2021, Frank Dornheim <dornheim@posteo.de>
# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
# SPDX-License-Identifier: GPL-3.0-or-later

from __future__ import (absolute_import, division, print_function)
__metaclass__ = type

DOCUMENTATION = r'''
    name: lxd
    short_description: Returns Ansible inventory from lxd host
    description:
        - Get inventory from the lxd.
        - Uses a YAML configuration file that ends with 'lxd.(yml|yaml)'.
    version_added: "3.0.0"
    author: "Frank Dornheim (@conloos)"
    requirements:
        - ipaddress
        - lxd >= 4.0
    options:
        plugin:
            description: Token that ensures this is a source file for the 'lxd' plugin.
            required: true
            choices: [ 'community.general.lxd' ]
        url:
            description:
            - The unix domain socket path or the https URL for the lxd server.
            - Sockets in filesystem have to start with C(unix:).
            - Mostly C(unix:/var/lib/lxd/unix.socket) or C(unix:/var/snap/lxd/common/lxd/unix.socket).
            default: unix:/var/snap/lxd/common/lxd/unix.socket
            type: str
        client_key:
            description:
            - The client certificate key file path.
            aliases: [ key_file ]
            default: $HOME/.config/lxc/client.key
            type: path
        client_cert:
            description:
            - The client certificate file path.
            aliases: [ cert_file ]
            default: $HOME/.config/lxc/client.crt
            type: path
        trust_password:
            description:
            - The client trusted password.
            - You need to set this password on the lxd server before
                running this module using the following command
                C(lxc config set core.trust_password <some random password>)
                See U(https://documentation.ubuntu.com/lxd/en/latest/authentication/#adding-client-certificates-using-a-trust-password).
            - If O(trust_password) is set, this module send a request for authentication before sending any requests.
            type: str
        state:
            description: Filter the instance according to the current status.
            type: str
            default: none
            choices: [ 'STOPPED', 'STARTING', 'RUNNING', 'none' ]
        project:
            description: Filter the instance according to the given project.
            type: str
            default: default
            version_added: 6.2.0
        type_filter:
            description:
            - Filter the instances by type V(virtual-machine), V(container) or V(both).
            - The first version of the inventory only supported containers.
            type: str
            default: container
            choices: [ 'virtual-machine', 'container', 'both' ]
            version_added: 4.2.0
        prefered_instance_network_interface:
            description:
            - If an instance has multiple network interfaces, select which one is the preferred as pattern.
            - Combined with the first number that can be found e.g. 'eth' + 0.
            - The option has been renamed from O(prefered_container_network_interface) to O(prefered_instance_network_interface)
              in community.general 3.8.0. The old name still works as an alias.
            type: str
            default: eth
            aliases:
              - prefered_container_network_interface
        prefered_instance_network_family:
            description:
            - If an instance has multiple network interfaces, which one is the preferred by family.
            - Specify V(inet) for IPv4 and V(inet6) for IPv6.
            type: str
            default: inet
            choices: [ 'inet', 'inet6' ]
        groupby:
            description:
            - Create groups by the following keywords C(location), C(network_range), C(os), C(pattern), C(profile), C(release), C(type), C(vlanid).
            - See example for syntax.
            type: dict
'''

EXAMPLES = '''
# simple lxd.yml
plugin: community.general.lxd
url: unix:/var/snap/lxd/common/lxd/unix.socket

# simple lxd.yml including filter
plugin: community.general.lxd
url: unix:/var/snap/lxd/common/lxd/unix.socket
state: RUNNING

# simple lxd.yml including virtual machines and containers
plugin: community.general.lxd
url: unix:/var/snap/lxd/common/lxd/unix.socket
type_filter: both

# grouping lxd.yml
groupby:
  locationBerlin:
    type: location
    attribute: Berlin
  netRangeIPv4:
    type: network_range
    attribute: 10.98.143.0/24
  netRangeIPv6:
    type: network_range
    attribute: fd42:bd00:7b11:2167:216:3eff::/24
  osUbuntu:
    type: os
    attribute: ubuntu
  testpattern:
    type: pattern
    attribute: test
  profileDefault:
    type: profile
    attribute: default
  profileX11:
    type: profile
    attribute: x11
  releaseFocal:
    type: release
    attribute: focal
  releaseBionic:
    type: release
    attribute: bionic
  typeVM:
    type: type
    attribute: virtual-machine
  typeContainer:
    type: type
    attribute: container
  vlan666:
    type: vlanid
    attribute: 666
  projectInternals:
    type: project
    attribute: internals
'''

import json
import re
import time
import os
from ansible.plugins.inventory import BaseInventoryPlugin
from ansible.module_utils.common.text.converters import to_native, to_text
from ansible.module_utils.common.dict_transformations import dict_merge
from ansible.module_utils.six import raise_from
from ansible.errors import AnsibleError, AnsibleParserError
from ansible.module_utils.six.moves.urllib.parse import urlencode
from ansible_collections.community.general.plugins.module_utils.lxd import LXDClient, LXDClientException
from ansible.utils.unsafe_proxy import wrap_var as make_unsafe

try:
    import ipaddress
except ImportError as exc:
    IPADDRESS_IMPORT_ERROR = exc
else:
    IPADDRESS_IMPORT_ERROR = None


class InventoryModule(BaseInventoryPlugin):
    DEBUG = 4
    NAME = 'community.general.lxd'
    SNAP_SOCKET_URL = 'unix:/var/snap/lxd/common/lxd/unix.socket'
    SOCKET_URL = 'unix:/var/lib/lxd/unix.socket'

    @staticmethod
    def load_json_data(path):
        """Load json data

        Load json data from file

        Args:
            list(path): Path elements
            str(file_name): Filename of data
        Kwargs:
            None
        Raises:
            None
        Returns:
            dict(json_data): json data"""
        try:
            with open(path, 'r') as json_file:
                return json.load(json_file)
        except (IOError, json.decoder.JSONDecodeError) as err:
            raise AnsibleParserError('Could not load the test data from {0}: {1}'.format(to_native(path), to_native(err)))

    def save_json_data(self, path, file_name=None):
        """save data as json

        Save data as json file

        Args:
            list(path): Path elements
            str(file_name): Filename of data
        Kwargs:
            None
        Raises:
            None
        Returns:
            None"""

        if file_name:
            path.append(file_name)
        else:
            prefix = 'lxd_data-'
            time_stamp = time.strftime('%Y%m%d-%H%M%S')
            suffix = '.atd'
            path.append(prefix + time_stamp + suffix)

        try:
            cwd = os.path.abspath(os.path.dirname(__file__))
            with open(os.path.abspath(os.path.join(cwd, *path)), 'w') as json_file:
                json.dump(self.data, json_file)
        except IOError as err:
            raise AnsibleParserError('Could not save data: {0}'.format(to_native(err)))

    def verify_file(self, path):
        """Check the config

        Return true/false if the config-file is valid for this plugin

        Args:
            str(path): path to the config
        Kwargs:
            None
        Raises:
            None
        Returns:
            bool(valid): is valid"""
        valid = False
        if super(InventoryModule, self).verify_file(path):
            if path.endswith(('lxd.yaml', 'lxd.yml')):
                valid = True
            else:
                self.display.vvv('Inventory source not ending in "lxd.yaml" or "lxd.yml"')
        return valid

    @staticmethod
    def validate_url(url):
        """validate url

        check whether the url is correctly formatted

        Args:
            url
        Kwargs:
            None
        Raises:
            AnsibleError
        Returns:
            bool"""
        if not isinstance(url, str):
            return False
        if not url.startswith(('unix:', 'https:')):
            raise AnsibleError('URL is malformed: {0}'.format(to_native(url)))
        return True

    def _connect_to_socket(self):
        """connect to lxd socket

        Connect to lxd socket by provided url or defaults

        Args:
            None
        Kwargs:
            None
        Raises:
            AnsibleError
        Returns:
            None"""
        error_storage = {}
        url_list = [self.get_option('url'), self.SNAP_SOCKET_URL, self.SOCKET_URL]
        urls = (url for url in url_list if self.validate_url(url))
        for url in urls:
            try:
                socket_connection = LXDClient(url, self.client_key, self.client_cert, self.debug)
                return socket_connection
            except LXDClientException as err:
                error_storage[url] = err
        raise AnsibleError('No connection to the socket: {0}'.format(to_native(error_storage)))

    def _get_networks(self):
        """Get Networknames

        Returns all network config names

        Args:
            None
        Kwargs:
            None
        Raises:
            None
        Returns:
            list(names): names of all network_configs"""
        # e.g. {'type': 'sync',
        #       'status': 'Success',
        #       'status_code': 200,
        #       'operation': '',
        #       'error_code': 0,
        #       'error': '',
        #       'metadata': ['/1.0/networks/lxdbr0']}
        network_configs = self.socket.do('GET', '/1.0/networks')
        return [m.split('/')[3] for m in network_configs['metadata']]

    def _get_instances(self):
        """Get instancenames

        Returns all instancenames

        Args:
            None
        Kwargs:
            None
        Raises:
            None
        Returns:
            list(names): names of all instances"""
        # e.g. {
        #        "metadata": [
        #          "/1.0/instances/foo",
        #          "/1.0/instances/bar"
        #        ],
        #        "status": "Success",
        #        "status_code": 200,
        #        "type": "sync"
        #      }
        url = '/1.0/instances'
        if self.project:
            url = url + '?{0}'.format(urlencode(dict(project=self.project)))

        instances = self.socket.do('GET', url)

        if self.project:
            return [m.split('/')[3].split('?')[0] for m in instances['metadata']]

        return [m.split('/')[3] for m in instances['metadata']]

    def _get_config(self, branch, name):
        """Get inventory of instance

        Get config of instance

        Args:
            str(branch): Name oft the API-Branch
            str(name): Name of instance
        Kwargs:
            None
        Source:
            https://documentation.ubuntu.com/lxd/en/latest/rest-api/
        Raises:
            None
        Returns:
            dict(config): Config of the instance"""
        config = {}
        if isinstance(branch, (tuple, list)):
            config[name] = {branch[1]: self.socket.do(
                'GET', '/1.0/{0}/{1}/{2}?{3}'.format(to_native(branch[0]), to_native(name), to_native(branch[1]), urlencode(dict(project=self.project))))}
        else:
            config[name] = {branch: self.socket.do(
                'GET', '/1.0/{0}/{1}?{2}'.format(to_native(branch), to_native(name), urlencode(dict(project=self.project))))}
        return config

    def get_instance_data(self, names):
        """Create Inventory of the instance

        Iterate through the different branches of the instances and collect Information.

        Args:
            list(names): List of instance names
        Kwargs:
            None
        Raises:
            None
        Returns:
            None"""
        # tuple(('instances','metadata/templates')) to get section in branch
        # e.g. /1.0/instances/<name>/metadata/templates
        branches = ['instances', ('instances', 'state')]
        instance_config = {}
        for branch in branches:
            for name in names:
                instance_config['instances'] = self._get_config(branch, name)
                self.data = dict_merge(instance_config, self.data)

    def get_network_data(self, names):
        """Create Inventory of the instance

        Iterate through the different branches of the instances and collect Information.

        Args:
            list(names): List of instance names
        Kwargs:
            None
        Raises:
            None
        Returns:
            None"""
        # tuple(('instances','metadata/templates')) to get section in branch
        # e.g. /1.0/instances/<name>/metadata/templates
        branches = [('networks', 'state')]
        network_config = {}
        for branch in branches:
            for name in names:
                try:
                    network_config['networks'] = self._get_config(branch, name)
                except LXDClientException:
                    network_config['networks'] = {name: None}
                self.data = dict_merge(network_config, self.data)

    def extract_network_information_from_instance_config(self, instance_name):
        """Returns the network interface configuration

        Returns the network ipv4 and ipv6 config of the instance without local-link

        Args:
            str(instance_name): Name oft he instance
        Kwargs:
            None
        Raises:
            None
        Returns:
            dict(network_configuration): network config"""
        instance_network_interfaces = self._get_data_entry('instances/{0}/state/metadata/network'.format(instance_name))
        network_configuration = None
        if instance_network_interfaces:
            network_configuration = {}
            gen_interface_names = [interface_name for interface_name in instance_network_interfaces if interface_name != 'lo']
            for interface_name in gen_interface_names:
                gen_address = [address for address in instance_network_interfaces[interface_name]['addresses'] if address.get('scope') != 'link']
                network_configuration[interface_name] = []
                for address in gen_address:
                    address_set = {}
                    address_set['family'] = address.get('family')
                    address_set['address'] = address.get('address')
                    address_set['netmask'] = address.get('netmask')
                    address_set['combined'] = address.get('address') + '/' + address.get('netmask')
                    network_configuration[interface_name].append(address_set)
        return network_configuration

    def get_prefered_instance_network_interface(self, instance_name):
        """Helper to get the preferred interface of thr instance

        Helper to get the preferred interface provide by neme pattern from 'prefered_instance_network_interface'.

        Args:
            str(instance_name): name of instance
        Kwargs:
            None
        Raises:
            None
        Returns:
            str(prefered_interface): None or interface name"""
        instance_network_interfaces = self._get_data_entry('inventory/{0}/network_interfaces'.format(instance_name))
        prefered_interface = None  # init
        if instance_network_interfaces:  # instance have network interfaces
            # generator if interfaces which start with the desired pattern
            net_generator = [interface for interface in instance_network_interfaces if interface.startswith(self.prefered_instance_network_interface)]
            selected_interfaces = []  # init
            for interface in net_generator:
                selected_interfaces.append(interface)
            if len(selected_interfaces) > 0:
                prefered_interface = sorted(selected_interfaces)[0]
        return prefered_interface

    def get_instance_vlans(self, instance_name):
        """Get VLAN(s) from instance

        Helper to get the VLAN_ID from the instance

        Args:
            str(instance_name): name of instance
        Kwargs:
            None
        Raises:
            None
        Returns:
            None"""
        # get network device configuration and store {network: vlan_id}
        network_vlans = {}
        for network in self._get_data_entry('networks'):
            if self._get_data_entry('state/metadata/vlan/vid', data=self.data['networks'].get(network)):
                network_vlans[network] = self._get_data_entry('state/metadata/vlan/vid', data=self.data['networks'].get(network))

        # get networkdevices of instance and return
        # e.g.
        # "eth0":{ "name":"eth0",
        #          "network":"lxdbr0",
        #          "type":"nic"},
        vlan_ids = {}
        devices = self._get_data_entry('instances/{0}/instances/metadata/expanded_devices'.format(to_native(instance_name)))
        for device in devices:
            if 'network' in devices[device]:
                if devices[device]['network'] in network_vlans:
                    vlan_ids[devices[device].get('network')] = network_vlans[devices[device].get('network')]
        return vlan_ids if vlan_ids else None

    def _get_data_entry(self, path, data=None, delimiter='/'):
        """Helper to get data

        Helper to get data from self.data by a path like 'path/to/target'
        Attention: Escaping of the delimiter is not (yet) provided.

        Args:
            str(path): path to nested dict
        Kwargs:
            dict(data): datastore
            str(delimiter): delimiter in Path.
        Raises:
            None
        Returns:
            *(value)"""
        try:
            if not data:
                data = self.data
            if delimiter in path:
                path = path.split(delimiter)

            if isinstance(path, list) and len(path) > 1:
                data = data[path.pop(0)]
                path = delimiter.join(path)
                return self._get_data_entry(path, data, delimiter)  # recursion
            return data[path]
        except KeyError:
            return None

    def _set_data_entry(self, instance_name, key, value, path=None):
        """Helper to save data

        Helper to save the data in self.data
        Detect if data is already in branch and use dict_merge() to prevent that branch is overwritten.

        Args:
            str(instance_name): name of instance
            str(key): same as dict
            *(value): same as dict
        Kwargs:
            str(path): path to branch-part
        Raises:
            AnsibleParserError
        Returns:
            None"""
        if not path:
            path = self.data['inventory']
        if instance_name not in path:
            path[instance_name] = {}

        try:
            if isinstance(value, dict) and key in path[instance_name]:
                path[instance_name] = dict_merge(value, path[instance_name][key])
            else:
                path[instance_name][key] = value
        except KeyError as err:
            raise AnsibleParserError("Unable to store Information: {0}".format(to_native(err)))

    def extract_information_from_instance_configs(self):
        """Process configuration information

        Preparation of the data

        Args:
            dict(configs): instance configurations
        Kwargs:
            None
        Raises:
            None
        Returns:
            None"""
        # create branch "inventory"
        if 'inventory' not in self.data:
            self.data['inventory'] = {}

        for instance_name in self.data['instances']:
            self._set_data_entry(instance_name, 'os', self._get_data_entry(
                'instances/{0}/instances/metadata/config/image.os'.format(instance_name)))
            self._set_data_entry(instance_name, 'release', self._get_data_entry(
                'instances/{0}/instances/metadata/config/image.release'.format(instance_name)))
            self._set_data_entry(instance_name, 'version', self._get_data_entry(
                'instances/{0}/instances/metadata/config/image.version'.format(instance_name)))
            self._set_data_entry(instance_name, 'profile', self._get_data_entry(
                'instances/{0}/instances/metadata/profiles'.format(instance_name)))
            self._set_data_entry(instance_name, 'location', self._get_data_entry(
                'instances/{0}/instances/metadata/location'.format(instance_name)))
            self._set_data_entry(instance_name, 'state', self._get_data_entry(
                'instances/{0}/instances/metadata/config/volatile.last_state.power'.format(instance_name)))
            self._set_data_entry(instance_name, 'type', self._get_data_entry(
                'instances/{0}/instances/metadata/type'.format(instance_name)))
            self._set_data_entry(instance_name, 'network_interfaces', self.extract_network_information_from_instance_config(instance_name))
            self._set_data_entry(instance_name, 'preferred_interface', self.get_prefered_instance_network_interface(instance_name))
            self._set_data_entry(instance_name, 'vlan_ids', self.get_instance_vlans(instance_name))
            self._set_data_entry(instance_name, 'project', self._get_data_entry(
                'instances/{0}/instances/metadata/project'.format(instance_name)))

    def build_inventory_network(self, instance_name):
        """Add the network interfaces of the instance to the inventory

        Logic:
            - if the instance have no interface -> 'ansible_connection: local'
            - get preferred_interface & prefered_instance_network_family -> 'ansible_connection: ssh' & 'ansible_host: <IP>'
            - first Interface from: network_interfaces prefered_instance_network_family -> 'ansible_connection: ssh' & 'ansible_host: <IP>'

        Args:
            str(instance_name): name of instance
        Kwargs:
            None
        Raises:
            None
        Returns:
            None"""

        def interface_selection(instance_name):
            """Select instance Interface for inventory

            Logic:
                - get preferred_interface & prefered_instance_network_family -> str(IP)
                - first Interface from: network_interfaces prefered_instance_network_family -> str(IP)

            Args:
                str(instance_name): name of instance
            Kwargs:
                None
            Raises:
                None
            Returns:
                dict(interface_name: ip)"""
            prefered_interface = self._get_data_entry('inventory/{0}/preferred_interface'.format(instance_name))  # name or None
            prefered_instance_network_family = self.prefered_instance_network_family

            ip_address = ''
            if prefered_interface:
                interface = self._get_data_entry('inventory/{0}/network_interfaces/{1}'.format(instance_name, prefered_interface))
                for config in interface:
                    if config['family'] == prefered_instance_network_family:
                        ip_address = config['address']
                        break
            else:
                interfaces = self._get_data_entry('inventory/{0}/network_interfaces'.format(instance_name))
                for interface in interfaces.values():
                    for config in interface:
                        if config['family'] == prefered_instance_network_family:
                            ip_address = config['address']
                            break
            return ip_address

        if self._get_data_entry('inventory/{0}/network_interfaces'.format(instance_name)):  # instance have network interfaces
            self.inventory.set_variable(instance_name, 'ansible_connection', 'ssh')
            self.inventory.set_variable(instance_name, 'ansible_host', make_unsafe(interface_selection(instance_name)))
        else:
            self.inventory.set_variable(instance_name, 'ansible_connection', 'local')

    def build_inventory_hosts(self):
        """Build host-part dynamic inventory

        Build the host-part of the dynamic inventory.
        Add Hosts and host_vars to the inventory.

        Args:
            None
        Kwargs:
            None
        Raises:
            None
        Returns:
            None"""
        for instance_name in self.data['inventory']:
            instance_state = str(self._get_data_entry('inventory/{0}/state'.format(instance_name)) or "STOPPED").lower()

            # Only consider instances that match the "state" filter, if self.state is not None
            if self.filter:
                if self.filter.lower() != instance_state:
                    continue
            # add instance
            instance_name = make_unsafe(instance_name)
            self.inventory.add_host(instance_name)
            # add network information
            self.build_inventory_network(instance_name)
            # add os
            v = self._get_data_entry('inventory/{0}/os'.format(instance_name))
            if v:
                self.inventory.set_variable(instance_name, 'ansible_lxd_os', make_unsafe(v.lower()))
            # add release
            v = self._get_data_entry('inventory/{0}/release'.format(instance_name))
            if v:
                self.inventory.set_variable(
                    instance_name, 'ansible_lxd_release', make_unsafe(v.lower()))
            # add profile
            self.inventory.set_variable(
                instance_name, 'ansible_lxd_profile', make_unsafe(self._get_data_entry('inventory/{0}/profile'.format(instance_name))))
            # add state
            self.inventory.set_variable(
                instance_name, 'ansible_lxd_state', make_unsafe(instance_state))
            # add type
            self.inventory.set_variable(
                instance_name, 'ansible_lxd_type', make_unsafe(self._get_data_entry('inventory/{0}/type'.format(instance_name))))
            # add location information
            if self._get_data_entry('inventory/{0}/location'.format(instance_name)) != "none":  # wrong type by lxd 'none' != 'None'
                self.inventory.set_variable(
                    instance_name, 'ansible_lxd_location', make_unsafe(self._get_data_entry('inventory/{0}/location'.format(instance_name))))
            # add VLAN_ID information
            if self._get_data_entry('inventory/{0}/vlan_ids'.format(instance_name)):
                self.inventory.set_variable(
                    instance_name, 'ansible_lxd_vlan_ids', make_unsafe(self._get_data_entry('inventory/{0}/vlan_ids'.format(instance_name))))
            # add project
            self.inventory.set_variable(
                instance_name, 'ansible_lxd_project', make_unsafe(self._get_data_entry('inventory/{0}/project'.format(instance_name))))

    def build_inventory_groups_location(self, group_name):
        """create group by attribute: location

        Args:
            str(group_name): Group name
        Kwargs:
            None
        Raises:
            None
        Returns:
            None"""
        # maybe we just want to expand one group
        if group_name not in self.inventory.groups:
            self.inventory.add_group(group_name)

        for instance_name in self.inventory.hosts:
            if 'ansible_lxd_location' in self.inventory.get_host(instance_name).get_vars():
                self.inventory.add_child(group_name, instance_name)

    def build_inventory_groups_pattern(self, group_name):
        """create group by name pattern

        Args:
            str(group_name): Group name
        Kwargs:
            None
        Raises:
            None
        Returns:
            None"""
        # maybe we just want to expand one group
        if group_name not in self.inventory.groups:
            self.inventory.add_group(group_name)

        regex_pattern = self.groupby[group_name].get('attribute')

        for instance_name in self.inventory.hosts:
            result = re.search(regex_pattern, instance_name)
            if result:
                self.inventory.add_child(group_name, instance_name)

    def build_inventory_groups_network_range(self, group_name):
        """check if IP is in network-class

        Args:
            str(group_name): Group name
        Kwargs:
            None
        Raises:
            None
        Returns:
            None"""
        # maybe we just want to expand one group
        if group_name not in self.inventory.groups:
            self.inventory.add_group(group_name)

        try:
            network = ipaddress.ip_network(to_text(self.groupby[group_name].get('attribute')))
        except ValueError as err:
            raise AnsibleParserError(
                'Error while parsing network range {0}: {1}'.format(self.groupby[group_name].get('attribute'), to_native(err)))

        for instance_name in self.inventory.hosts:
            if self.data['inventory'][instance_name].get('network_interfaces') is not None:
                for interface in self.data['inventory'][instance_name].get('network_interfaces'):
                    for interface_family in self.data['inventory'][instance_name].get('network_interfaces')[interface]:
                        try:
                            address = ipaddress.ip_address(to_text(interface_family['address']))
                            if address.version == network.version and address in network:
                                self.inventory.add_child(group_name, instance_name)
                        except ValueError:
                            # Ignore invalid IP addresses returned by lxd
                            pass

    def build_inventory_groups_project(self, group_name):
        """create group by attribute: project

        Args:
            str(group_name): Group name
        Kwargs:
            None
        Raises:
            None
        Returns:
            None"""
        # maybe we just want to expand one group
        if group_name not in self.inventory.groups:
            self.inventory.add_group(group_name)

        gen_instances = [
            instance_name for instance_name in self.inventory.hosts
            if 'ansible_lxd_project' in self.inventory.get_host(instance_name).get_vars()]
        for instance_name in gen_instances:
            if self.groupby[group_name].get('attribute').lower() == self.inventory.get_host(instance_name).get_vars().get('ansible_lxd_project'):
                self.inventory.add_child(group_name, instance_name)

    def build_inventory_groups_os(self, group_name):
        """create group by attribute: os

        Args:
            str(group_name): Group name
        Kwargs:
            None
        Raises:
            None
        Returns:
            None"""
        # maybe we just want to expand one group
        if group_name not in self.inventory.groups:
            self.inventory.add_group(group_name)

        gen_instances = [
            instance_name for instance_name in self.inventory.hosts
            if 'ansible_lxd_os' in self.inventory.get_host(instance_name).get_vars()]
        for instance_name in gen_instances:
            if self.groupby[group_name].get('attribute').lower() == self.inventory.get_host(instance_name).get_vars().get('ansible_lxd_os'):
                self.inventory.add_child(group_name, instance_name)

    def build_inventory_groups_release(self, group_name):
        """create group by attribute: release

        Args:
            str(group_name): Group name
        Kwargs:
            None
        Raises:
            None
        Returns:
            None"""
        # maybe we just want to expand one group
        if group_name not in self.inventory.groups:
            self.inventory.add_group(group_name)

        gen_instances = [
            instance_name for instance_name in self.inventory.hosts
            if 'ansible_lxd_release' in self.inventory.get_host(instance_name).get_vars()]
        for instance_name in gen_instances:
            if self.groupby[group_name].get('attribute').lower() == self.inventory.get_host(instance_name).get_vars().get('ansible_lxd_release'):
                self.inventory.add_child(group_name, instance_name)

    def build_inventory_groups_profile(self, group_name):
        """create group by attribute: profile

        Args:
            str(group_name): Group name
        Kwargs:
            None
        Raises:
            None
        Returns:
            None"""
        # maybe we just want to expand one group
        if group_name not in self.inventory.groups:
            self.inventory.add_group(group_name)

        gen_instances = [
            instance_name for instance_name in self.inventory.hosts.keys()
            if 'ansible_lxd_profile' in self.inventory.get_host(instance_name).get_vars().keys()]
        for instance_name in gen_instances:
            if self.groupby[group_name].get('attribute').lower() in self.inventory.get_host(instance_name).get_vars().get('ansible_lxd_profile'):
                self.inventory.add_child(group_name, instance_name)

    def build_inventory_groups_vlanid(self, group_name):
        """create group by attribute: vlanid

        Args:
            str(group_name): Group name
        Kwargs:
            None
        Raises:
            None
        Returns:
            None"""
        # maybe we just want to expand one group
        if group_name not in self.inventory.groups:
            self.inventory.add_group(group_name)

        gen_instances = [
            instance_name for instance_name in self.inventory.hosts.keys()
            if 'ansible_lxd_vlan_ids' in self.inventory.get_host(instance_name).get_vars().keys()]
        for instance_name in gen_instances:
            if self.groupby[group_name].get('attribute') in self.inventory.get_host(instance_name).get_vars().get('ansible_lxd_vlan_ids').values():
                self.inventory.add_child(group_name, instance_name)

    def build_inventory_groups_type(self, group_name):
        """create group by attribute: type

        Args:
            str(group_name): Group name
        Kwargs:
            None
        Raises:
            None
        Returns:
            None"""
        # maybe we just want to expand one group
        if group_name not in self.inventory.groups:
            self.inventory.add_group(group_name)

        gen_instances = [
            instance_name for instance_name in self.inventory.hosts
            if 'ansible_lxd_type' in self.inventory.get_host(instance_name).get_vars()]
        for instance_name in gen_instances:
            if self.groupby[group_name].get('attribute').lower() == self.inventory.get_host(instance_name).get_vars().get('ansible_lxd_type'):
                self.inventory.add_child(group_name, instance_name)

    def build_inventory_groups(self):
        """Build group-part dynamic inventory

        Build the group-part of the dynamic inventory.
        Add groups to the inventory.

        Args:
            None
        Kwargs:
            None
        Raises:
            None
        Returns:
            None"""

        def group_type(group_name):
            """create groups defined by lxd.yml or defaultvalues

            create groups defined by lxd.yml or defaultvalues
            supportetd:
                * 'location'
                * 'pattern'
                * 'network_range'
                * 'os'
                * 'release'
                * 'profile'
                * 'vlanid'
                * 'type'
                * 'project'

            Args:
                str(group_name): Group name
            Kwargs:
                None
            Raises:
                None
            Returns:
                None"""

            # Due to the compatibility with python 2 no use of map
            if self.groupby[group_name].get('type') == 'location':
                self.build_inventory_groups_location(group_name)
            elif self.groupby[group_name].get('type') == 'pattern':
                self.build_inventory_groups_pattern(group_name)
            elif self.groupby[group_name].get('type') == 'network_range':
                self.build_inventory_groups_network_range(group_name)
            elif self.groupby[group_name].get('type') == 'os':
                self.build_inventory_groups_os(group_name)
            elif self.groupby[group_name].get('type') == 'release':
                self.build_inventory_groups_release(group_name)
            elif self.groupby[group_name].get('type') == 'profile':
                self.build_inventory_groups_profile(group_name)
            elif self.groupby[group_name].get('type') == 'vlanid':
                self.build_inventory_groups_vlanid(group_name)
            elif self.groupby[group_name].get('type') == 'type':
                self.build_inventory_groups_type(group_name)
            elif self.groupby[group_name].get('type') == 'project':
                self.build_inventory_groups_project(group_name)
            else:
                raise AnsibleParserError('Unknown group type: {0}'.format(to_native(group_name)))

        if self.groupby:
            for group_name in self.groupby:
                if not group_name.isalnum():
                    raise AnsibleParserError('Invalid character(s) in groupname: {0}'.format(to_native(group_name)))
                group_type(make_unsafe(group_name))

    def build_inventory(self):
        """Build dynamic inventory

        Build the dynamic inventory.

        Args:
            None
        Kwargs:
            None
        Raises:
            None
        Returns:
            None"""

        self.build_inventory_hosts()
        self.build_inventory_groups()

    def cleandata(self):
        """Clean the dynamic inventory

        The first version of the inventory only supported container.
        This will change in the future.
        The following function cleans up the data and remove the all items with the wrong type.

        Args:
            None
        Kwargs:
            None
        Raises:
            None
        Returns:
            None"""
        iter_keys = list(self.data['instances'].keys())
        for instance_name in iter_keys:
            if self._get_data_entry('instances/{0}/instances/metadata/type'.format(instance_name)) != self.type_filter:
                del self.data['instances'][instance_name]

    def _populate(self):
        """Return the hosts and groups

        Returns the processed instance configurations from the lxd import

        Args:
            None
        Kwargs:
            None
        Raises:
            None
        Returns:
            None"""

        if len(self.data) == 0:  # If no data is injected by unittests open socket
            self.socket = self._connect_to_socket()
            self.get_instance_data(self._get_instances())
            self.get_network_data(self._get_networks())

        # The first version of the inventory only supported containers.
        # This will change in the future.
        # The following function cleans up the data.
        if self.type_filter != 'both':
            self.cleandata()

        self.extract_information_from_instance_configs()

        # self.display.vvv(self.save_json_data([os.path.abspath(__file__)]))

        self.build_inventory()

    def parse(self, inventory, loader, path, cache):
        """Return dynamic inventory from source

        Returns the processed inventory from the lxd import

        Args:
            str(inventory): inventory object with existing data and
                            the methods to add hosts/groups/variables
                            to inventory
            str(loader):    Ansible's DataLoader
            str(path):      path to the config
            bool(cache):    use or avoid caches
        Kwargs:
            None
        Raises:
            AnsibleParserError
        Returns:
            None"""
        if IPADDRESS_IMPORT_ERROR:
            raise_from(
                AnsibleError('another_library must be installed to use this plugin'),
                IPADDRESS_IMPORT_ERROR)

        super(InventoryModule, self).parse(inventory, loader, path, cache=False)
        # Read the inventory YAML file
        self._read_config_data(path)
        try:
            self.client_key = self.get_option('client_key')
            self.client_cert = self.get_option('client_cert')
            self.project = self.get_option('project')
            self.debug = self.DEBUG
            self.data = {}  # store for inventory-data
            self.groupby = self.get_option('groupby')
            self.plugin = self.get_option('plugin')
            self.prefered_instance_network_family = self.get_option('prefered_instance_network_family')
            self.prefered_instance_network_interface = self.get_option('prefered_instance_network_interface')
            self.type_filter = self.get_option('type_filter')
            if self.get_option('state').lower() == 'none':  # none in config is str()
                self.filter = None
            else:
                self.filter = self.get_option('state').lower()
            self.trust_password = self.get_option('trust_password')
            self.url = self.get_option('url')
        except Exception as err:
            raise AnsibleParserError(
                'All correct options required: {0}'.format(to_native(err)))
        # Call our internal helper to populate the dynamic inventory
        self._populate()