Add support for controlled paging via Gax.

.coveragerc

@@ -1,6 +1,7 @@
 [report]
 omit =
     */_generated/*.py
+show_missing = True
 exclude_lines =
     # Re-enable the standard pragma
     pragma: NO COVER

gcloud/pubsub/_gax.py

@@ -16,6 +16,7 @@
 
 # pylint: disable=import-error
 from google.gax import CallOptions
+from google.gax import INITIAL_PAGE
 from google.gax.errors import GaxError
 from google.gax.grpc import exc_to_code
 from google.pubsub.v1.pubsub_pb2 import PubsubMessage
@@ -28,6 +29,14 @@
 from gcloud._helpers import _to_bytes
 
 
+def _build_paging_options(page_token=None):
+    """Helper for :meth:'_PublisherAPI.list_topics' et aliae."""
+    if page_token is None:
+        page_token = INITIAL_PAGE
+    options = {'page_token': page_token}
+    return CallOptions(**options)
+
+
 class _PublisherAPI(object):
     """Helper mapping publisher-related APIs.
 
@@ -37,7 +46,7 @@ class _PublisherAPI(object):
     def __init__(self, gax_api):
         self._gax_api = gax_api
 
-    def list_topics(self, project):
+    def list_topics(self, project, page_token=None):
         """List topics for the project associated with this API.
 
         See:
@@ -46,13 +55,18 @@ def list_topics(self, project):
         :type project: string
         :param project: project ID
 
+        :type page_token: string
+        :param page_token: opaque marker for the next "page" of topics. If not
+                           passed, the API will return the first page of
+                           topics.
+
         :rtype: tuple, (list, str)
         :returns: list of ``Topic`` resource dicts, plus a
                   "next page token" string:  if not None, indicates that
                   more topics can be retrieved with another call (pass that
                   value as ``page_token``).
         """
-        options = CallOptions(is_page_streaming=False)
+        options = _build_paging_options(page_token)
         path = 'projects/%s' % (project,)
         response = self._gax_api.list_topics(path, options)
         topics = [{'name': topic_pb.name} for topic_pb in response.topics]
@@ -152,7 +166,7 @@ def topic_publish(self, topic_path, messages):
             raise
         return response.message_ids
 
-    def topic_list_subscriptions(self, topic_path):
+    def topic_list_subscriptions(self, topic_path, page_token=None):
         """API call:  list subscriptions bound to a topic
 
         See:
@@ -162,13 +176,18 @@ def topic_list_subscriptions(self, topic_path):
         :param topic_path: fully-qualified path of the topic, in format
                             ``projects/<PROJECT>/topics/<TOPIC_NAME>``.
 
+        :type page_token: string
+        :param page_token: opaque marker for the next "page" of subscriptions.
+                           If not passed, the API will return the first page
+                           of subscriptions.
+
         :rtype: list of strings
         :returns: fully-qualified names of subscriptions for the supplied
                 topic.
         :raises: :exc:`gcloud.exceptions.NotFound` if the topic does not
                     exist
         """
-        options = CallOptions(is_page_streaming=False)
+        options = _build_paging_options(page_token)
         try:
             response = self._gax_api.list_topic_subscriptions(
                 topic_path, options)
@@ -190,7 +209,7 @@ class _SubscriberAPI(object):
     def __init__(self, gax_api):
         self._gax_api = gax_api
 
-    def list_subscriptions(self, project):
+    def list_subscriptions(self, project, page_token=None):
         """List subscriptions for the project associated with this API.
 
         See:
@@ -199,13 +218,18 @@ def list_subscriptions(self, project):
         :type project: string
         :param project: project ID
 
+        :type page_token: string
+        :param page_token: opaque marker for the next "page" of subscriptions.
+                           If not passed, the API will return the first page
+                           of subscriptions.
+
         :rtype: tuple, (list, str)
         :returns: list of ``Subscription`` resource dicts, plus a
                   "next page token" string:  if not None, indicates that
                   more topics can be retrieved with another call (pass that
                   value as ``page_token``).
         """
-        options = CallOptions(is_page_streaming=False)
+        options = _build_paging_options(page_token)
         path = 'projects/%s' % (project,)
         response = self._gax_api.list_subscriptions(path, options)
         subscriptions = [_subscription_pb_to_mapping(sub_pb)

gcloud/pubsub/test__gax.py

@@ -52,7 +52,9 @@ def test_ctor(self):
         self.assertTrue(api._gax_api is gax_api)
 
     def test_list_topics_no_paging(self):
-        response = _ListTopicsResponsePB([_TopicPB(self.TOPIC_PATH)])
+        from google.gax import INITIAL_PAGE
+        TOKEN = 'TOKEN'
+        response = _ListTopicsResponsePB([_TopicPB(self.TOPIC_PATH)], TOKEN)
         gax_api = _GAXPublisherAPI(_list_topics_response=response)
         api = self._makeOne(gax_api)
 
@@ -62,11 +64,31 @@ def test_list_topics_no_paging(self):
         topic = topics[0]
         self.assertIsInstance(topic, dict)
         self.assertEqual(topic['name'], self.TOPIC_PATH)
-        self.assertEqual(next_token, None)
+        self.assertEqual(next_token, TOKEN)
 
         name, options = gax_api._list_topics_called_with
         self.assertEqual(name, self.PROJECT_PATH)
-        self.assertFalse(options.is_page_streaming)
+        self.assertTrue(options.page_token is INITIAL_PAGE)
+
+    def test_list_topics_with_paging(self):
+        TOKEN = 'TOKEN'
+        NEW_TOKEN = 'NEW_TOKEN'
+        response = _ListTopicsResponsePB(
+            [_TopicPB(self.TOPIC_PATH)], NEW_TOKEN)
+        gax_api = _GAXPublisherAPI(_list_topics_response=response)
+        api = self._makeOne(gax_api)
+
+        topics, next_token = api.list_topics(self.PROJECT, page_token=TOKEN)
+
+        self.assertEqual(len(topics), 1)
+        topic = topics[0]
+        self.assertIsInstance(topic, dict)
+        self.assertEqual(topic['name'], self.TOPIC_PATH)
+        self.assertEqual(next_token, NEW_TOKEN)
+
+        name, options = gax_api._list_topics_called_with
+        self.assertEqual(name, self.PROJECT_PATH)
+        self.assertEqual(options.page_token, TOKEN)
 
     def test_topic_create(self):
         topic_pb = _TopicPB(self.TOPIC_PATH)
@@ -233,6 +255,7 @@ def test_topic_publish_error(self):
         self.assertEqual(options, None)
 
     def test_topic_list_subscriptions_no_paging(self):
+        from google.gax import INITIAL_PAGE
         response = _ListTopicSubscriptionsResponsePB([self.SUB_PATH])
         gax_api = _GAXPublisherAPI(_list_topic_subscriptions_response=response)
         api = self._makeOne(gax_api)
@@ -249,9 +272,32 @@ def test_topic_list_subscriptions_no_paging(self):
 
         topic_path, options = gax_api._list_topic_subscriptions_called_with
         self.assertEqual(topic_path, self.TOPIC_PATH)
-        self.assertFalse(options.is_page_streaming)
+        self.assertTrue(options.page_token is INITIAL_PAGE)
+
+    def test_topic_list_subscriptions_with_paging(self):
+        TOKEN = 'TOKEN'
+        NEW_TOKEN = 'NEW_TOKEN'
+        response = _ListTopicSubscriptionsResponsePB(
+            [self.SUB_PATH], NEW_TOKEN)
+        gax_api = _GAXPublisherAPI(_list_topic_subscriptions_response=response)
+        api = self._makeOne(gax_api)
+
+        subscriptions, next_token = api.topic_list_subscriptions(
+            self.TOPIC_PATH, page_token=TOKEN)
+
+        self.assertEqual(len(subscriptions), 1)
+        subscription = subscriptions[0]
+        self.assertIsInstance(subscription, dict)
+        self.assertEqual(subscription['name'], self.SUB_PATH)
+        self.assertEqual(subscription['topic'], self.TOPIC_PATH)
+        self.assertEqual(next_token, NEW_TOKEN)
+
+        name, options = gax_api._list_topic_subscriptions_called_with
+        self.assertEqual(name, self.TOPIC_PATH)
+        self.assertEqual(options.page_token, TOKEN)
 
     def test_topic_list_subscriptions_miss(self):
+        from google.gax import INITIAL_PAGE
         from gcloud.exceptions import NotFound
         gax_api = _GAXPublisherAPI()
         api = self._makeOne(gax_api)
@@ -261,9 +307,10 @@ def test_topic_list_subscriptions_miss(self):
 
         topic_path, options = gax_api._list_topic_subscriptions_called_with
         self.assertEqual(topic_path, self.TOPIC_PATH)
-        self.assertFalse(options.is_page_streaming)
+        self.assertTrue(options.page_token is INITIAL_PAGE)
 
     def test_topic_list_subscriptions_error(self):
+        from google.gax import INITIAL_PAGE
         from google.gax.errors import GaxError
         gax_api = _GAXPublisherAPI(_random_gax_error=True)
         api = self._makeOne(gax_api)
@@ -273,7 +320,7 @@ def test_topic_list_subscriptions_error(self):
 
         topic_path, options = gax_api._list_topic_subscriptions_called_with
         self.assertEqual(topic_path, self.TOPIC_PATH)
-        self.assertFalse(options.is_page_streaming)
+        self.assertTrue(options.page_token is INITIAL_PAGE)
 
 
 @unittest2.skipUnless(_HAVE_GAX, 'No gax-python')
@@ -291,6 +338,7 @@ def test_ctor(self):
         self.assertTrue(api._gax_api is gax_api)
 
     def test_list_subscriptions_no_paging(self):
+        from google.gax import INITIAL_PAGE
         response = _ListSubscriptionsResponsePB([_SubscriptionPB(
             self.SUB_PATH, self.TOPIC_PATH, self.PUSH_ENDPOINT, 0)])
         gax_api = _GAXSubscriberAPI(_list_subscriptions_response=response)
@@ -310,7 +358,32 @@ def test_list_subscriptions_no_paging(self):
 
         name, options = gax_api._list_subscriptions_called_with
         self.assertEqual(name, self.PROJECT_PATH)
-        self.assertFalse(options.is_page_streaming)
+        self.assertTrue(options.page_token is INITIAL_PAGE)
+
+    def test_list_subscriptions_with_paging(self):
+        TOKEN = 'TOKEN'
+        NEW_TOKEN = 'NEW_TOKEN'
+        response = _ListSubscriptionsResponsePB([_SubscriptionPB(
+            self.SUB_PATH, self.TOPIC_PATH, self.PUSH_ENDPOINT, 0)], NEW_TOKEN)
+        gax_api = _GAXSubscriberAPI(_list_subscriptions_response=response)
+        api = self._makeOne(gax_api)
+
+        subscriptions, next_token = api.list_subscriptions(
+            self.PROJECT, page_token=TOKEN)
+
+        self.assertEqual(len(subscriptions), 1)
+        subscription = subscriptions[0]
+        self.assertIsInstance(subscription, dict)
+        self.assertEqual(subscription['name'], self.SUB_PATH)
+        self.assertEqual(subscription['topic'], self.TOPIC_PATH)
+        self.assertEqual(subscription['pushConfig'],
+                         {'pushEndpoint': self.PUSH_ENDPOINT})
+        self.assertEqual(subscription['ackDeadlineSeconds'], 0)
+        self.assertEqual(next_token, NEW_TOKEN)
+
+        name, options = gax_api._list_subscriptions_called_with
+        self.assertEqual(name, self.PROJECT_PATH)
+        self.assertEqual(options.page_token, TOKEN)
 
     def test_subscription_create(self):
         sub_pb = _SubscriptionPB(self.SUB_PATH, self.TOPIC_PATH, '', 0)

setup.py

@@ -19,7 +19,8 @@
 ]
 
 GRPC_EXTRAS = [
-    'grpcio == 0.13.1',
+    'grpcio >= 0.14.0',
+    'google-gax >= 0.11.0',
     'gax-google-pubsub-v1',
 ]
 

tox.ini

@@ -21,12 +21,20 @@ covercmd =
       --cover-branches \
       --nocapture
 
+[grpc]
+deps =
+    grpcio >= 0.14.0
+    google-gax >= 0.11.0
+    gax-google-pubsub-v1
+
 [testenv:py27]
 basepython =
     python2.7
 commands =
-    pip --quiet install gcloud[grpc]
     nosetests
+deps =
+    {[testenv]deps}
+    {[grpc]deps}
 setenv =
     PYTHONPATH =
 
@@ -45,10 +53,10 @@ deps =
 basepython =
     python2.7
 commands =
-    pip --quiet install gcloud[grpc]
     {[testenv]covercmd} --cover-min-percentage=100
 deps =
     {[testenv]deps}
+    {[grpc]deps}
     coverage
 setenv =
     PYTHONPATH =
@@ -112,10 +120,12 @@ passenv = {[testenv:system-tests]passenv}
 basepython =
     python2.7
 commands =
-    pip --quiet install gcloud[grpc]
     python {toxinidir}/system_tests/attempt_system_tests.py
 setenv =
     PYTHONPATH =
+deps =
+    {[testenv]deps}
+    {[grpc]deps}
 passenv = GOOGLE_* GCLOUD_* TRAVIS* encrypted_*
 
 [testenv:system-tests3]