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# Copyright 2021 Google LLC

#

# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

#

# http://www.apache.org/licenses/LICENSE-2.0

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

import base64

import json

import os

from googleapiclient import discovery

PROJECT_ID = os.getenv('GCP_PROJECT')

PROJECT_NAME = f'projects/{PROJECT_ID}'

def stop_billing(data, context):

pubsub_data = base64.b64decode(data['data']).decode('utf-8')

pubsub_json = json.loads(pubsub_data)

cost_amount = pubsub_json['costAmount']

budget_amount = pubsub_json['budgetAmount']

if cost_amount <= budget_amount:

print(f'No action necessary. (Current cost: {cost_amount})')

return

if PROJECT_ID is None:

print('No project specified with environment variable')

return

billing = discovery.build(

'cloudbilling',

'v1',

cache_discovery=False,

)

projects = billing.projects()

billing_enabled = __is_billing_enabled(PROJECT_NAME, projects)

if billing_enabled:

__disable_billing_for_project(PROJECT_NAME, projects)

else:

print('Billing already disabled')

def __is_billing_enabled(project_name, projects):

"""

Determine whether billing is enabled for a project

@param {string} project_name Name of project to check if billing is enabled

@return {bool} Whether project has billing enabled or not

"""

try:

res = projects.getBillingInfo(name=project_name).execute()

return res['billingEnabled']

except KeyError:

# If billingEnabled isn't part of the return, billing is not enabled

return False

except Exception:

print('Unable to determine if billing is enabled on specified project, assuming billing is enabled')

return True

def __disable_billing_for_project(project_name, projects):

"""

Disable billing for a project by removing its billing account

@param {string} project_name Name of project disable billing on

"""

body = {'billingAccountName': ''} # Disable billing

try:

res = projects.updateBillingInfo(name=project_name, body=body).execute()

print(f'Billing disabled: {json.dumps(res)}')

except Exception:

print('Failed to disable billing, possibly check permissions')