ansible/contrib/inventory/vmware_inventory.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Copyright (C): 2017, Ansible Project
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)

# Requirements
#   - pyvmomi >= 6.0.0.2016.4

# TODO:
#   * more jq examples
#   * optional folder hierarchy

"""
$ jq '._meta.hostvars[].config' data.json | head
{
  "alternateguestname": "",
  "instanceuuid": "5035a5cd-b8e8-d717-e133-2d383eb0d675",
  "memoryhotaddenabled": false,
  "guestfullname": "Red Hat Enterprise Linux 7 (64-bit)",
  "changeversion": "2016-05-16T18:43:14.977925Z",
  "uuid": "4235fc97-5ddb-7a17-193b-9a3ac97dc7b4",
  "cpuhotremoveenabled": false,
  "vpmcenabled": false,
  "firmware": "bios",
"""

from __future__ import print_function

import atexit
import datetime
import itertools
import json
import os
import re
import ssl
import sys
import uuid
from time import time

from jinja2 import Environment

from ansible.module_utils.six import integer_types, PY3
from ansible.module_utils.six.moves import configparser

try:
    import argparse
except ImportError:
    sys.exit('Error: This inventory script required "argparse" python module.  Please install it or upgrade to python-2.7')

try:
    from pyVmomi import vim, vmodl
    from pyVim.connect import SmartConnect, Disconnect
except ImportError:
    sys.exit("ERROR: This inventory script required 'pyVmomi' Python module, it was not able to load it")


def regex_match(s, pattern):
    '''Custom filter for regex matching'''
    reg = re.compile(pattern)
    if reg.match(s):
        return True
    else:
        return False


def select_chain_match(inlist, key, pattern):
    '''Get a key from a list of dicts, squash values to a single list, then filter'''
    outlist = [x[key] for x in inlist]
    outlist = list(itertools.chain(*outlist))
    outlist = [x for x in outlist if regex_match(x, pattern)]
    return outlist


class VMwareMissingHostException(Exception):
    pass


class VMWareInventory(object):
    __name__ = 'VMWareInventory'

    guest_props = False
    instances = []
    debug = False
    load_dumpfile = None
    write_dumpfile = None
    maxlevel = 1
    lowerkeys = True
    config = None
    cache_max_age = None
    cache_path_cache = None
    cache_path_index = None
    cache_dir = None
    server = None
    port = None
    username = None
    password = None
    validate_certs = True
    host_filters = []
    skip_keys = []
    groupby_patterns = []
    groupby_custom_field_excludes = []

    safe_types = [bool, str, float, None] + list(integer_types)
    iter_types = [dict, list]

    bad_types = ['Array', 'disabledMethod', 'declaredAlarmState']

    vimTableMaxDepth = {
        "vim.HostSystem": 2,
        "vim.VirtualMachine": 2,
    }

    custom_fields = {}

    # use jinja environments to allow for custom filters
    env = Environment()
    env.filters['regex_match'] = regex_match
    env.filters['select_chain_match'] = select_chain_match

    # translation table for attributes to fetch for known vim types

    vimTable = {
        vim.Datastore: ['_moId', 'name'],
        vim.ResourcePool: ['_moId', 'name'],
        vim.HostSystem: ['_moId', 'name'],
    }

    @staticmethod
    def _empty_inventory():
        return {"_meta": {"hostvars": {}}}

    def __init__(self, load=True):
        self.inventory = VMWareInventory._empty_inventory()

        if load:
            # Read settings and parse CLI arguments
            self.parse_cli_args()
            self.read_settings()

            # Check the cache
            cache_valid = self.is_cache_valid()

            # Handle Cache
            if self.args.refresh_cache or not cache_valid:
                self.do_api_calls_update_cache()
            else:
                self.debugl('loading inventory from cache')
                self.inventory = self.get_inventory_from_cache()

    def debugl(self, text):
        if self.args.debug:
            try:
                text = str(text)
            except UnicodeEncodeError:
                text = text.encode('utf-8')
            print('%s %s' % (datetime.datetime.now(), text))

    def show(self):
        # Data to print
        self.debugl('dumping results')
        data_to_print = None
        if self.args.host:
            data_to_print = self.get_host_info(self.args.host)
        elif self.args.list:
            # Display list of instances for inventory
            data_to_print = self.inventory
        return json.dumps(data_to_print, indent=2)

    def is_cache_valid(self):
        ''' Determines if the cache files have expired, or if it is still valid '''

        valid = False

        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:
                valid = True

        return valid

    def do_api_calls_update_cache(self):
        ''' Get instances and cache the data '''
        self.inventory = self.instances_to_inventory(self.get_instances())
        self.write_to_cache(self.inventory)

    def write_to_cache(self, data):
        ''' Dump inventory to json file '''
        with open(self.cache_path_cache, 'w') as f:
            f.write(json.dumps(data, indent=2))

    def get_inventory_from_cache(self):
        ''' Read in jsonified inventory '''

        jdata = None
        with open(self.cache_path_cache, 'r') as f:
            jdata = f.read()
        return json.loads(jdata)

    def read_settings(self):
        ''' Reads the settings from the vmware_inventory.ini file '''

        scriptbasename = __file__
        scriptbasename = os.path.basename(scriptbasename)
        scriptbasename = scriptbasename.replace('.py', '')

        defaults = {'vmware': {
            'server': '',
            'port': 443,
            'username': '',
            'password': '',
            'validate_certs': True,
            'ini_path': os.path.join(os.path.dirname(__file__), '%s.ini' % scriptbasename),
            'cache_name': 'ansible-vmware',
            'cache_path': '~/.ansible/tmp',
            'cache_max_age': 3600,
            'max_object_level': 1,
            'skip_keys': 'declaredalarmstate,'
                         'disabledmethod,'
                         'dynamicproperty,'
                         'dynamictype,'
                         'environmentbrowser,'
                         'managedby,'
                         'parent,'
                         'childtype,'
                         'resourceconfig',
            'alias_pattern': '{{ config.name + "_" + config.uuid }}',
            'host_pattern': '{{ guest.ipaddress }}',
            'host_filters': '{{ runtime.powerstate == "poweredOn" }}',
            'groupby_patterns': '{{ guest.guestid }},{{ "templates" if config.template else "guests"}}',
            'lower_var_keys': True,
            'custom_field_group_prefix': 'vmware_tag_',
            'groupby_custom_field_excludes': '',
            'groupby_custom_field': False}
        }

        if PY3:
            config = configparser.ConfigParser()
        else:
            config = configparser.SafeConfigParser()

        # where is the config?
        vmware_ini_path = os.environ.get('VMWARE_INI_PATH', defaults['vmware']['ini_path'])
        vmware_ini_path = os.path.expanduser(os.path.expandvars(vmware_ini_path))
        config.read(vmware_ini_path)

        if 'vmware' not in config.sections():
            config.add_section('vmware')

        # apply defaults
        for k, v in defaults['vmware'].items():
            if not config.has_option('vmware', k):
                config.set('vmware', k, str(v))

        # where is the cache?
        self.cache_dir = os.path.expanduser(config.get('vmware', 'cache_path'))
        if self.cache_dir and not os.path.exists(self.cache_dir):
            os.makedirs(self.cache_dir)

        # set the cache filename and max age
        cache_name = config.get('vmware', 'cache_name')
        self.cache_path_cache = self.cache_dir + "/%s.cache" % cache_name
        self.debugl('cache path is %s' % self.cache_path_cache)
        self.cache_max_age = int(config.getint('vmware', 'cache_max_age'))

        # mark the connection info
        self.server = os.environ.get('VMWARE_SERVER', config.get('vmware', 'server'))
        self.debugl('server is %s' % self.server)
        self.port = int(os.environ.get('VMWARE_PORT', config.get('vmware', 'port')))
        self.username = os.environ.get('VMWARE_USERNAME', config.get('vmware', 'username'))
        self.debugl('username is %s' % self.username)
        self.password = os.environ.get('VMWARE_PASSWORD', config.get('vmware', 'password', raw=True))
        self.validate_certs = os.environ.get('VMWARE_VALIDATE_CERTS', config.get('vmware', 'validate_certs'))
        if self.validate_certs in ['no', 'false', 'False', False]:
            self.validate_certs = False

        self.debugl('cert validation is %s' % self.validate_certs)

        # behavior control
        self.maxlevel = int(config.get('vmware', 'max_object_level'))
        self.debugl('max object level is %s' % self.maxlevel)
        self.lowerkeys = config.get('vmware', 'lower_var_keys')
        if type(self.lowerkeys) != bool:
            if str(self.lowerkeys).lower() in ['yes', 'true', '1']:
                self.lowerkeys = True
            else:
                self.lowerkeys = False
        self.debugl('lower keys is %s' % self.lowerkeys)
        self.skip_keys = list(config.get('vmware', 'skip_keys').split(','))
        self.debugl('skip keys is %s' % self.skip_keys)
        temp_host_filters = list(config.get('vmware', 'host_filters').split('}},'))
        for host_filter in temp_host_filters:
            host_filter = host_filter.rstrip()
            if host_filter != "":
                if not host_filter.endswith("}}"):
                    host_filter += "}}"
                self.host_filters.append(host_filter)
        self.debugl('host filters are %s' % self.host_filters)

        temp_groupby_patterns = list(config.get('vmware', 'groupby_patterns').split('}},'))
        for groupby_pattern in temp_groupby_patterns:
            groupby_pattern = groupby_pattern.rstrip()
            if groupby_pattern != "":
                if not groupby_pattern.endswith("}}"):
                    groupby_pattern += "}}"
                self.groupby_patterns.append(groupby_pattern)
        self.debugl('groupby patterns are %s' % self.groupby_patterns)
        temp_groupby_custom_field_excludes = config.get('vmware', 'groupby_custom_field_excludes')
        self.groupby_custom_field_excludes = [x.strip('"') for x in [y.strip("'") for y in temp_groupby_custom_field_excludes.split(",")]]
        self.debugl('groupby exclude strings are %s' % self.groupby_custom_field_excludes)

        # Special feature to disable the brute force serialization of the
        # virtual machine objects. The key name for these properties does not
        # matter because the values are just items for a larger list.
        if config.has_section('properties'):
            self.guest_props = []
            for prop in config.items('properties'):
                self.guest_props.append(prop[1])

        # save the config
        self.config = config

    def parse_cli_args(self):
        ''' Command line argument processing '''

        parser = argparse.ArgumentParser(description='Produce an Ansible Inventory file based on PyVmomi')
        parser.add_argument('--debug', action='store_true', default=False,
                            help='show debug info')
        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 VSphere (default: False - use cache files)')
        parser.add_argument('--max-instances', default=None, type=int,
                            help='maximum number of instances to retrieve')
        self.args = parser.parse_args()

    def get_instances(self):
        ''' Get a list of vm instances with pyvmomi '''
        kwargs = {'host': self.server,
                  'user': self.username,
                  'pwd': self.password,
                  'port': int(self.port)}

        if self.validate_certs and hasattr(ssl, 'SSLContext'):
            context = ssl.SSLContext(ssl.PROTOCOL_SSLv23)
            context.verify_mode = ssl.CERT_REQUIRED
            context.check_hostname = True
            kwargs['sslContext'] = context
        elif self.validate_certs and not hasattr(ssl, 'SSLContext'):
            sys.exit('pyVim does not support changing verification mode with python < 2.7.9. Either update '
                     'python or use validate_certs=false.')
        elif not self.validate_certs and hasattr(ssl, 'SSLContext'):
            context = ssl.SSLContext(ssl.PROTOCOL_SSLv23)
            context.verify_mode = ssl.CERT_NONE
            context.check_hostname = False
            kwargs['sslContext'] = context
        elif not self.validate_certs and not hasattr(ssl, 'SSLContext'):
            # Python 2.7.9 < or RHEL/CentOS 7.4 <
            pass

        return self._get_instances(kwargs)

    def _get_instances(self, inkwargs):
        ''' Make API calls '''
        instances = []
        si = None
        try:
            si = SmartConnect(**inkwargs)
        except ssl.SSLError as connection_error:
            if '[SSL: CERTIFICATE_VERIFY_FAILED]' in str(connection_error) and self.validate_certs:
                sys.exit("Unable to connect to ESXi server due to %s, "
                         "please specify validate_certs=False and try again" % connection_error)

        except Exception as exc:
            self.debugl("Unable to connect to ESXi server due to %s" % exc)
            sys.exit("Unable to connect to ESXi server due to %s" % exc)

        self.debugl('retrieving all instances')
        if not si:
            sys.exit("Could not connect to the specified host using specified "
                     "username and password")
        atexit.register(Disconnect, si)
        content = si.RetrieveContent()

        # Create a search container for virtualmachines
        self.debugl('creating containerview for virtualmachines')
        container = content.rootFolder
        viewType = [vim.VirtualMachine]
        recursive = True
        containerView = content.viewManager.CreateContainerView(container, viewType, recursive)
        children = containerView.view
        for child in children:
            # If requested, limit the total number of instances
            if self.args.max_instances:
                if len(instances) >= self.args.max_instances:
                    break
            instances.append(child)
        self.debugl("%s total instances in container view" % len(instances))

        if self.args.host:
            instances = [x for x in instances if x.name == self.args.host]

        instance_tuples = []
        for instance in instances:
            if self.guest_props:
                ifacts = self.facts_from_proplist(instance)
            else:
                ifacts = self.facts_from_vobj(instance)
            instance_tuples.append((instance, ifacts))
        self.debugl('facts collected for all instances')

        try:
            cfm = content.customFieldsManager
            if cfm is not None and cfm.field:
                for f in cfm.field:
                    if not f.managedObjectType or f.managedObjectType == vim.VirtualMachine:
                        self.custom_fields[f.key] = f.name
                self.debugl('%d custom fields collected' % len(self.custom_fields))
        except vmodl.RuntimeFault as exc:
            self.debugl("Unable to gather custom fields due to %s" % exc.msg)
        except IndexError as exc:
            self.debugl("Unable to gather custom fields due to %s" % exc)

        return instance_tuples

    def instances_to_inventory(self, instances):
        ''' Convert a list of vm objects into a json compliant inventory '''
        self.debugl('re-indexing instances based on ini settings')
        inventory = VMWareInventory._empty_inventory()
        inventory['all'] = {}
        inventory['all']['hosts'] = []
        for idx, instance in enumerate(instances):
            # make a unique id for this object to avoid vmware's
            # numerous uuid's which aren't all unique.
            thisid = str(uuid.uuid4())
            idata = instance[1]

            # Put it in the inventory
            inventory['all']['hosts'].append(thisid)
            inventory['_meta']['hostvars'][thisid] = idata.copy()
            inventory['_meta']['hostvars'][thisid]['ansible_uuid'] = thisid

        # Make a map of the uuid to the alias the user wants
        name_mapping = self.create_template_mapping(
            inventory,
            self.config.get('vmware', 'alias_pattern')
        )

        # Make a map of the uuid to the ssh hostname the user wants
        host_mapping = self.create_template_mapping(
            inventory,
            self.config.get('vmware', 'host_pattern')
        )

        # Reset the inventory keys
        for k, v in name_mapping.items():

            if not host_mapping or k not in host_mapping:
                continue

            # set ansible_host (2.x)
            try:
                inventory['_meta']['hostvars'][k]['ansible_host'] = host_mapping[k]
                # 1.9.x backwards compliance
                inventory['_meta']['hostvars'][k]['ansible_ssh_host'] = host_mapping[k]
            except Exception:
                continue

            if k == v:
                continue

            # add new key
            inventory['all']['hosts'].append(v)
            inventory['_meta']['hostvars'][v] = inventory['_meta']['hostvars'][k]

            # cleanup old key
            inventory['all']['hosts'].remove(k)
            inventory['_meta']['hostvars'].pop(k, None)

        self.debugl('pre-filtered hosts:')
        for i in inventory['all']['hosts']:
            self.debugl('  * %s' % i)
        # Apply host filters
        for hf in self.host_filters:
            if not hf:
                continue
            self.debugl('filter: %s' % hf)
            filter_map = self.create_template_mapping(inventory, hf, dtype='boolean')
            for k, v in filter_map.items():
                if not v:
                    # delete this host
                    inventory['all']['hosts'].remove(k)
                    inventory['_meta']['hostvars'].pop(k, None)

        self.debugl('post-filter hosts:')
        for i in inventory['all']['hosts']:
            self.debugl('  * %s' % i)

        # Create groups
        for gbp in self.groupby_patterns:
            groupby_map = self.create_template_mapping(inventory, gbp)
            for k, v in groupby_map.items():
                if v not in inventory:
                    inventory[v] = {}
                    inventory[v]['hosts'] = []
                if k not in inventory[v]['hosts']:
                    inventory[v]['hosts'].append(k)

        if self.config.get('vmware', 'groupby_custom_field'):
            for k, v in inventory['_meta']['hostvars'].items():
                if 'customvalue' in v:
                    for tv in v['customvalue']:
                        newkey = None
                        field_name = self.custom_fields[tv['key']] if tv['key'] in self.custom_fields else tv['key']
                        if field_name in self.groupby_custom_field_excludes:
                            continue
                        values = []
                        keylist = map(lambda x: x.strip(), tv['value'].split(','))
                        for kl in keylist:
                            try:
                                newkey = "%s%s_%s" % (self.config.get('vmware', 'custom_field_group_prefix'), str(field_name), kl)
                                newkey = newkey.strip()
                            except Exception as e:
                                self.debugl(e)
                            values.append(newkey)
                        for tag in values:
                            if not tag:
                                continue
                            if tag not in inventory:
                                inventory[tag] = {}
                                inventory[tag]['hosts'] = []
                            if k not in inventory[tag]['hosts']:
                                inventory[tag]['hosts'].append(k)

        return inventory

    def create_template_mapping(self, inventory, pattern, dtype='string'):
        ''' Return a hash of uuid to templated string from pattern '''
        mapping = {}
        for k, v in inventory['_meta']['hostvars'].items():
            t = self.env.from_string(pattern)
            newkey = None
            try:
                newkey = t.render(v)
                newkey = newkey.strip()
            except Exception as e:
                self.debugl(e)
            if not newkey:
                continue
            elif dtype == 'integer':
                newkey = int(newkey)
            elif dtype == 'boolean':
                if newkey.lower() == 'false':
                    newkey = False
                elif newkey.lower() == 'true':
                    newkey = True
            elif dtype == 'string':
                pass
            mapping[k] = newkey
        return mapping

    def facts_from_proplist(self, vm):
        '''Get specific properties instead of serializing everything'''

        rdata = {}
        for prop in self.guest_props:
            self.debugl('getting %s property for %s' % (prop, vm.name))
            key = prop
            if self.lowerkeys:
                key = key.lower()

            if '.' not in prop:
                # props without periods are direct attributes of the parent
                vm_property = getattr(vm, prop)
                if isinstance(vm_property, vim.CustomFieldsManager.Value.Array):
                    temp_vm_property = []
                    for vm_prop in vm_property:
                        temp_vm_property.append({'key': vm_prop.key,
                                                 'value': vm_prop.value})
                    rdata[key] = temp_vm_property
                else:
                    rdata[key] = vm_property
            else:
                # props with periods are subkeys of parent attributes
                parts = prop.split('.')
                total = len(parts) - 1

                # pointer to the current object
                val = None
                # pointer to the current result key
                lastref = rdata

                for idx, x in enumerate(parts):

                    if isinstance(val, dict):
                        if x in val:
                            val = val.get(x)
                        elif x.lower() in val:
                            val = val.get(x.lower())
                    else:
                        # if the val wasn't set yet, get it from the parent
                        if not val:
                            try:
                                val = getattr(vm, x)
                            except AttributeError as e:
                                self.debugl(e)
                        else:
                            # in a subkey, get the subprop from the previous attrib
                            try:
                                val = getattr(val, x)
                            except AttributeError as e:
                                self.debugl(e)

                        # make sure it serializes
                        val = self._process_object_types(val)

                    # lowercase keys if requested
                    if self.lowerkeys:
                        x = x.lower()

                    # change the pointer or set the final value
                    if idx != total:
                        if x not in lastref:
                            lastref[x] = {}
                        lastref = lastref[x]
                    else:
                        lastref[x] = val
        if self.args.debug:
            self.debugl("For %s" % vm.name)
            for key in list(rdata.keys()):
                if isinstance(rdata[key], dict):
                    for ikey in list(rdata[key].keys()):
                        self.debugl("Property '%s.%s' has value '%s'" % (key, ikey, rdata[key][ikey]))
                else:
                    self.debugl("Property '%s' has value '%s'" % (key, rdata[key]))
        return rdata

    def facts_from_vobj(self, vobj, level=0):
        ''' Traverse a VM object and return a json compliant data structure '''

        # pyvmomi objects are not yet serializable, but may be one day ...
        # https://github.com/vmware/pyvmomi/issues/21

        # WARNING:
        # Accessing an object attribute will trigger a SOAP call to the remote.
        # Increasing the attributes collected or the depth of recursion greatly
        # increases runtime duration and potentially memory+network utilization.

        if level == 0:
            try:
                self.debugl("get facts for %s" % vobj.name)
            except Exception as e:
                self.debugl(e)

        rdata = {}

        methods = dir(vobj)
        methods = [str(x) for x in methods if not x.startswith('_')]
        methods = [x for x in methods if x not in self.bad_types]
        methods = [x for x in methods if not x.lower() in self.skip_keys]
        methods = sorted(methods)

        for method in methods:
            # Attempt to get the method, skip on fail
            try:
                methodToCall = getattr(vobj, method)
            except Exception as e:
                continue

            # Skip callable methods
            if callable(methodToCall):
                continue

            if self.lowerkeys:
                method = method.lower()

            rdata[method] = self._process_object_types(
                methodToCall,
                thisvm=vobj,
                inkey=method,
            )

        return rdata

    def _process_object_types(self, vobj, thisvm=None, inkey='', level=0):
        ''' Serialize an object '''
        rdata = {}

        if type(vobj).__name__ in self.vimTableMaxDepth and level >= self.vimTableMaxDepth[type(vobj).__name__]:
            return rdata

        if vobj is None:
            rdata = None
        elif type(vobj) in self.vimTable:
            rdata = {}
            for key in self.vimTable[type(vobj)]:
                try:
                    rdata[key] = getattr(vobj, key)
                except Exception as e:
                    self.debugl(e)

        elif issubclass(type(vobj), str) or isinstance(vobj, str):
            if vobj.isalnum():
                rdata = vobj
            else:
                rdata = vobj.encode('utf-8').decode('utf-8')
        elif issubclass(type(vobj), bool) or isinstance(vobj, bool):
            rdata = vobj
        elif issubclass(type(vobj), integer_types) or isinstance(vobj, integer_types):
            rdata = vobj
        elif issubclass(type(vobj), float) or isinstance(vobj, float):
            rdata = vobj
        elif issubclass(type(vobj), list) or issubclass(type(vobj), tuple):
            rdata = []
            try:
                vobj = sorted(vobj)
            except Exception:
                pass

            for idv, vii in enumerate(vobj):
                if level + 1 <= self.maxlevel:
                    vid = self._process_object_types(
                        vii,
                        thisvm=thisvm,
                        inkey=inkey + '[' + str(idv) + ']',
                        level=(level + 1)
                    )

                    if vid:
                        rdata.append(vid)

        elif issubclass(type(vobj), dict):
            pass

        elif issubclass(type(vobj), object):
            methods = dir(vobj)
            methods = [str(x) for x in methods if not x.startswith('_')]
            methods = [x for x in methods if x not in self.bad_types]
            methods = [x for x in methods if not inkey + '.' + x.lower() in self.skip_keys]
            methods = sorted(methods)

            for method in methods:
                # Attempt to get the method, skip on fail
                try:
                    methodToCall = getattr(vobj, method)
                except Exception as e:
                    continue

                if callable(methodToCall):
                    continue

                if self.lowerkeys:
                    method = method.lower()
                if level + 1 <= self.maxlevel:
                    try:
                        rdata[method] = self._process_object_types(
                            methodToCall,
                            thisvm=thisvm,
                            inkey=inkey + '.' + method,
                            level=(level + 1)
                        )
                    except vim.fault.NoPermission:
                        self.debugl("Skipping method %s (NoPermission)" % method)
        else:
            pass

        return rdata

    def get_host_info(self, host):
        ''' Return hostvars for a single host '''

        if host in self.inventory['_meta']['hostvars']:
            return self.inventory['_meta']['hostvars'][host]
        elif self.args.host and self.inventory['_meta']['hostvars']:
            match = None
            for k, v in self.inventory['_meta']['hostvars'].items():
                if self.inventory['_meta']['hostvars'][k]['name'] == self.args.host:
                    match = k
                    break
            if match:
                return self.inventory['_meta']['hostvars'][match]
            else:
                raise VMwareMissingHostException('%s not found' % host)
        else:
            raise VMwareMissingHostException('%s not found' % host)


if __name__ == "__main__":
    # Run the script
    print(VMWareInventory().show())