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# Copyright 2012 Google Inc.
# Copyright 2019 Red Hat, Inc.
#
# 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 logging
import requests
import threading
import time
TOKEN_URL = ('http://metadata.google.internal/computeMetadata/'
'v1/instance/service-accounts/default/token')
REFRESH = 25
RETRY_INTERVAL = 5
class GCloudAuth(requests.auth.AuthBase):
log = logging.getLogger('zuul.GerritConnection')
def __init__(self, user, password):
self.token = None
self.expires = 0
try:
self.getToken()
except Exception:
self.log.exception("Error updating token:")
self.update_thread = threading.Thread(target=self.update)
self.update_thread.daemon = True
self.update_thread.start()
def update(self):
while True:
try:
self._update()
except Exception:
self.log.exception("Error updating token:")
time.sleep(5)
def _update(self):
now = time.time()
expires = self.expires - REFRESH
expires = max(expires, now + RETRY_INTERVAL)
while now < expires:
time.sleep(expires - now)
now = time.time()
self.getToken()
def getToken(self):
r = requests.get(TOKEN_URL, headers={'Metadata-Flavor': 'Google'})
data = r.json()
self.token = data['access_token']
self.expires = time.time() + data['expires_in']
def __call__(self, request):
request.prepare_cookies({'o': self.token})
return request
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