Reporting on your network settings based on the APIs available here: https://cloud.google.com/vpc/docs/apis

network_report.py

import sys
import json

from pprint import pprint

from googleapiclient import discovery
from oauth2client.client import GoogleCredentials


def get_forwarding_rules(service, project):
	request = service.forwardingRules().aggregatedList(project=project)
	nextFn = service.forwardingRules().aggregatedList_next
	return _aggregated_list(request, nextFn)


def get_firewalls(service, project):
	request = service.firewalls().list(project=project)
	nextFn = service.firewalls().list_next
	return _list(request, nextFn)


def get_routes(service, project):
	request = service.routes().list(project=project)
	nextFn = service.routes().list_next
	return _list(request, nextFn)


def get_subnets(service, project):
	request = service.subnetworks().aggregatedList(project=project)
	nextFn = service.subnetworks().aggregatedList_next
	return _aggregated_list(request, nextFn)	


def get_networks(service, project):
	request = service.networks().list(project=project)
	nextFn = service.networks().list_next
	return _list(request, nextFn)


def get_service_projects(service, project):
	request = service.projects().getXpnResources(project=project)
	nextFn = service.projects().getXpnResources_next
	items_key='resources'
	return _list(request, nextFn, items_key)


def get_routers(service, project):
	request = service.routers().aggregatedList(project=project)
	nextFn = service.routers().aggregatedList_next
	return _aggregated_list(request, nextFn)


def _list(request, nextFn, items_key='items'):
	results = []
	try:
		while request is not None:
		    response = request.execute()

		    for item in response[items_key]:
		    	results.append(item)

		    request = nextFn(previous_request=request, previous_response=response)
	except:
		pass
	return results


def _aggregated_list(request, nextFn, items_key='items'):
	results = {}
	try:
		while request is not None:
		    response = request.execute()

		    for name, values in response[items_key].items():
		    	results[name] = values
		    request = nextFn(previous_request=request, previous_response=response)
	except:
		pass
	return results


def _main(project):
	credentials = GoogleCredentials.get_application_default()

	service = discovery.build('compute', 'v1', credentials=credentials)
	results = {}

	results['firewalls'] = get_firewalls(service, project)
	results['forwardingRules'] = get_forwarding_rules(service, project)
	results['routes'] = get_routes(service, project)
	results['routers'] = get_routers(service, project)
	results['networks'] = get_networks(service, project)
	results['serviceProjects'] = get_service_projects(service, project)
	results['subnets'] = get_subnets(service, project)


	print(json.dumps(results, sort_keys=True, indent=4))



if __name__ == "__main__":
	if len(sys.argv) > 1:
		project = sys.argv[1]
		_main(project)
	else:
		print('usage: network_report.py {project ID}')