mirror of https://github.com/ekimekim/wubloader
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
68 lines
2.3 KiB
Python
68 lines
2.3 KiB
Python
|
|
import time
|
|
import logging
|
|
|
|
import gevent
|
|
|
|
from .requests import InstrumentedSession
|
|
|
|
# Wraps all requests in some metric collection
|
|
requests = InstrumentedSession()
|
|
|
|
|
|
class GoogleAPIClient(object):
|
|
"""Manages access to google apis and maintains an active access token.
|
|
Make calls using client.request(), which is a wrapper for requests.request().
|
|
"""
|
|
|
|
ACCESS_TOKEN_ERROR_RETRY_INTERVAL = 10
|
|
# Refresh token 10min before it expires (it normally lasts an hour)
|
|
ACCESS_TOKEN_REFRESH_TIME_BEFORE_EXPIRY = 600
|
|
|
|
def __init__(self, client_id, client_secret, refresh_token):
|
|
self.client_id = client_id
|
|
self.client_secret = client_secret
|
|
self.refresh_token = refresh_token
|
|
|
|
self._first_get_access_token = gevent.spawn(self.get_access_token)
|
|
|
|
@property
|
|
def access_token(self):
|
|
"""Blocks if access token unavailable yet"""
|
|
self._first_get_access_token.join()
|
|
return self._access_token
|
|
|
|
def get_access_token(self):
|
|
"""Authenticates against google's API and retrieves a token we will use in
|
|
subsequent requests.
|
|
This function gets called automatically when needed, there should be no need to call it
|
|
yourself."""
|
|
while True:
|
|
try:
|
|
start_time = time.time()
|
|
resp = requests.post('https://www.googleapis.com/oauth2/v4/token', data={
|
|
'client_id': self.client_id,
|
|
'client_secret': self.client_secret,
|
|
'refresh_token': self.refresh_token,
|
|
'grant_type': 'refresh_token',
|
|
}, metric_name='get_access_token')
|
|
resp.raise_for_status()
|
|
data = resp.json()
|
|
self._access_token = data['access_token']
|
|
expires_in = (start_time + data['expires_in']) - time.time()
|
|
if expires_in < self.ACCESS_TOKEN_REFRESH_TIME_BEFORE_EXPIRY:
|
|
self.logger.warning("Access token expires in {}s, less than normal leeway time of {}s".format(
|
|
expires_in, self.ACCESS_TOKEN_REFRESH_TIME_BEFORE_EXPIRY,
|
|
))
|
|
gevent.spawn_later(expires_in - self.ACCESS_TOKEN_REFRESH_TIME_BEFORE_EXPIRY, self.get_access_token)
|
|
except Exception:
|
|
logging.exception("Failed to fetch access token, retrying")
|
|
gevent.sleep(self.ACCESS_TOKEN_ERROR_RETRY_INTERVAL)
|
|
else:
|
|
break
|
|
|
|
def request(self, method, url, headers={}, **kwargs):
|
|
# merge in auth header
|
|
headers = dict(headers, Authorization='Bearer {}'.format(self.access_token))
|
|
return requests.request(method, url, headers=headers, **kwargs)
|