inv.py

#!/usr/bin/python
import os
import sys
import argparse
from google.cloud.resourcemanager import ProjectsClient

try:
    import json
except ImportError:
    import simplejson as json

class IpsosInventory(object):

    def __init__(self):
        self.inventory = {}
        self.read_cli_args()
        if self.args.list:
            self.inventory = self.example_inventory()
        elif self.args.host:
            self.inventory = self.empty_inventory()
        else:
            self.inventory = self.empty_inventory()
        print(json.dumps(self.inventory))

    def example_inventory(self):
        client = ProjectsClient()
        project_pager = client.search_projects()
        pjs = {}
        for page in project_pager:
            pjs[page.project_id] = { 'hosts': ['10.220.21.24', '10.220.21.27'], 'vars': { 'ansible_ssh_user': 'projectuser'} }
        return(pjs)

        #         'hostvars': {
        #             '10.220.21.24': {
        #                 'host_specific_var': 'testhost'
        #             },
        #             '10.220.21.27': {
        #                 'host_specific_var': 'towerhost'
        #             }
        #         }
        #     }
        # }

    def empty_inventory(self):
        return {'_meta': {'hostvars': {}}}

    def read_cli_args(self):
        parser = argparse.ArgumentParser()
        parser.add_argument('--list', action = 'store_true')
        parser.add_argument('--host', action = 'store')
        self.args = parser.parse_args()

IpsosInventory()