From: Itamar Turner-Trauring Date: Mon, 4 Mar 2013 15:53:45 +0000 (-0500) Subject: Tests for googlestorage_container.AuthenticationClient. X-Git-Url: https://git.rkrishnan.org/a?a=commitdiff_plain;h=c13f4d049b0bd0446b2512d397324c7b4846e856;p=tahoe-lafs%2Ftahoe-lafs.git Tests for googlestorage_container.AuthenticationClient. Author: Itamar Turner-Trauring --- diff --git a/src/allmydata/storage/backends/cloud/googlestorage/googlestorage_container.py b/src/allmydata/storage/backends/cloud/googlestorage/googlestorage_container.py index aa337dc4..df6efe74 100644 --- a/src/allmydata/storage/backends/cloud/googlestorage/googlestorage_container.py +++ b/src/allmydata/storage/backends/cloud/googlestorage/googlestorage_container.py @@ -6,7 +6,7 @@ http://code.google.com/p/google-api-python-client/downloads/list import httplib2 -from twisted.internet.defer import DeferredLock +from twisted.internet.defer import DeferredLock, maybeDeferred from twisted.internet.threads import deferToThread from oauth2client.client import SignedJwtAssertionCredentials @@ -34,29 +34,48 @@ class AuthenticationClient(object): more details. """ - def __init__(self, account_name, private_key, private_key_password='notasecret'): - self.credentials = SignedJwtAssertionCredentials( + def __init__(self, account_name, private_key, private_key_password='notasecret', + _credentialsClass=SignedJwtAssertionCredentials, + _deferToThread=deferToThread): + # Google ships pkcs12 private keys encrypted with "notasecret" as the + # password. In order for automated running to work we'd need to + # include the password in the config file, so it adds no extra + # security even if someone chooses a different password. So it's seems + # simplest to hardcode it for now and it'll work with unmodified + # private keys issued by Google. + self._credentials = _credentialsClass( account_name, private_key, "https://www.googleapis.com/auth/devstorage.read_write", private_key_password = private_key_password, ) + self._deferToThread = _deferToThread self._need_first_auth = True self._lock = DeferredLock() + # Get initial token: + self._refresh_if_necessary(force=True) + + def _refresh_if_necessary(self, force=False): + """ + Get a new authorization token, if necessary. + """ + def run(): + if force or self._credentials.access_token_expired: + # Generally using a task-specific thread pool is better than using + # the reactor one. However, this particular call will only run + # once an hour, so it's not likely to tie up all the threads. + return self._deferToThread(self._credentials.refresh, httplib2.Http()) + return self._lock.run(run) def get_authorization_header(self): """ Return a Deferred that fires with the value to use for the Authorization header in HTTP requests. """ - def refreshIfNecessary(): - if self._need_first_auth or self.credentials.access_token_expired: - self._need_first_auth = False - return deferToThread(self.credentials.refresh, httplib2.Http()) - d = self._lock.run(refreshIfNecessary) + d = self._refresh_if_necessary() def refreshed(ignore): headers = {} - self.credentials.apply(headers) + self._credentials.apply(headers) return headers['Authorization'] d.addCallback(refreshed) return d diff --git a/src/allmydata/test/test_storage.py b/src/allmydata/test/test_storage.py index 2cb7acb9..401d384e 100644 --- a/src/allmydata/test/test_storage.py +++ b/src/allmydata/test/test_storage.py @@ -2,6 +2,7 @@ import time, os.path, platform, re, simplejson, struct, itertools, urllib from collections import deque from cStringIO import StringIO +import thread import mock from twisted.trial import unittest @@ -33,6 +34,7 @@ from allmydata.storage.backends.cloud.cloud_common import CloudError, CloudServi from allmydata.storage.backends.cloud import mock_cloud, cloud_common from allmydata.storage.backends.cloud.mock_cloud import MockContainer from allmydata.storage.backends.cloud.openstack import openstack_container +from allmydata.storage.backends.cloud.googlestorage import googlestorage_container from allmydata.storage.bucket import BucketWriter, BucketReader from allmydata.storage.common import DataTooLargeError, storage_index_to_dir from allmydata.storage.leasedb import SHARETYPE_IMMUTABLE, SHARETYPE_MUTABLE @@ -629,6 +631,132 @@ class OpenStackCloudBackend(ServiceParentMixin, WorkdirMixin, ShouldFailMixin, u return d + +class GoogleStorageBackend(ShouldFailMixin, unittest.TestCase): + """ + Tests for the Google Storage API backend. + + All code references in docstrings/comments are to classes/functions in + allmydata.storage.backends.cloud.googlestorage.googlestorage_container + unless noted otherwise. + """ + + def test_authentication_credentials(self): + """ + AuthenticationClient.get_authorization_header() initializes a + SignedJwtAssertionCredentials with the correct parameters. + """ + # Somewhat fragile tests, but better than nothing. + auth = googlestorage_container.AuthenticationClient("u@example.com", "xxx123") + self.assertEqual(auth._credentials.service_account_name, "u@example.com") + self.assertEqual(auth._credentials.private_key, "xxx123".encode("base64").strip()) + + def test_authentication_initial(self): + """ + When AuthenticationClient() is created, it refreshes its access token. + """ + from oauth2client.client import SignedJwtAssertionCredentials + auth = googlestorage_container.AuthenticationClient( + "u@example.com", "xxx123", + _credentialsClass=mock.create_autospec(SignedJwtAssertionCredentials), + _deferToThread=defer.maybeDeferred) + self.assertEqual(auth._credentials.refresh.call_count, 1) + + def test_authentication_expired(self): + """ + AuthenticationClient.get_authorization_header() refreshes its + credentials if the access token has expired. + """ + from oauth2client.client import SignedJwtAssertionCredentials + auth = googlestorage_container.AuthenticationClient( + "u@example.com", "xxx123", + _credentialsClass=mock.create_autospec(SignedJwtAssertionCredentials), + _deferToThread=defer.maybeDeferred) + auth._credentials.apply = lambda d: d.__setitem__('Authorization', 'xxx') + auth._credentials.access_token_expired = True + auth.get_authorization_header() + self.assertEqual(auth._credentials.refresh.call_count, 2) + + def test_authentication_no_refresh(self): + """ + AuthenticationClient.get_authorization_header() does not refresh its + credentials if the access token has not expired. + """ + from oauth2client.client import SignedJwtAssertionCredentials + auth = googlestorage_container.AuthenticationClient( + "u@example.com", "xxx123", + _credentialsClass=mock.create_autospec(SignedJwtAssertionCredentials), + _deferToThread=defer.maybeDeferred) + auth._credentials.apply = lambda d: d.__setitem__('Authorization', 'xxx') + auth._credentials.access_token_expired = False + auth.get_authorization_header() + self.assertEqual(auth._credentials.refresh.call_count, 1) + + def test_authentication_header(self): + """ + AuthenticationClient.get_authorization_header() returns a value to be + used for the Authorization header. + """ + from oauth2client.client import SignedJwtAssertionCredentials + class NoNetworkCreds(SignedJwtAssertionCredentials): + def refresh(self, http): + self.access_token = "xxx" + auth = googlestorage_container.AuthenticationClient( + "u@example.com", "xxx123", + _credentialsClass=NoNetworkCreds, + _deferToThread=defer.maybeDeferred) + result = [] + auth.get_authorization_header().addCallback(result.append) + self.assertEqual(result, ["Bearer xxx"]) + + def test_authentication_one_refresh(self): + """ + AuthenticationClient._refresh_if_necessary() only runs one refresh + request at a time. + """ + # The second call shouldn't happen until the first Deferred fires! + results = [defer.Deferred(), defer.succeed(None)] + first = results[0] + + def fakeDeferToThread(f, *args): + return results.pop(0) + + from oauth2client.client import SignedJwtAssertionCredentials + auth = googlestorage_container.AuthenticationClient( + "u@example.com", "xxx123", + _credentialsClass=mock.create_autospec(SignedJwtAssertionCredentials), + _deferToThread=fakeDeferToThread) + # Initial authorization call happens... + self.assertEqual(len(results), 1) + # ... and still isn't finished, so next one doesn't run yet: + auth._refresh_if_necessary(force=True) + self.assertEqual(len(results), 1) + # When first one finishes, second one can run: + first.callback(None) + self.assertEqual(len(results), 0) + + def test_authentication_refresh_call(self): + """ + AuthenticationClient._refresh_if_necessary() runs the + authentication refresh in a thread, since it blocks, with a + httplib2.Http instance. + """ + from httplib2 import Http + from oauth2client.client import SignedJwtAssertionCredentials + class NoNetworkCreds(SignedJwtAssertionCredentials): + def refresh(cred_self, http): + cred_self.access_token = "xxx" + self.assertIsInstance(http, Http) + self.thread = thread.get_ident() + auth = googlestorage_container.AuthenticationClient( + "u@example.com", "xxx123", + _credentialsClass=NoNetworkCreds) + + def gotResult(ignore): + self.assertNotEqual(thread.get_ident(), self.thread) + return auth.get_authorization_header().addCallback(gotResult) + + class ServerMixin: def allocate(self, account, storage_index, sharenums, size, canary=None): # These secrets are not used, but clients still provide them.