Updates pubsub client [(#1195)](GoogleCloudPlatform/python-docs-sampl…

…es#1195)

* Updates pubsub client

* Fixes lint error.

samples/api-client/manager/manager.py

@@ -42,23 +42,19 @@
 from googleapiclient.errors import HttpError
 
 
-def create_iot_topic(topic_name):
+def create_iot_topic(project, topic_name):
     """Creates a PubSub Topic and grants access to Cloud IoT Core."""
-    pubsub_client = pubsub.Client()
-    topic = pubsub_client.topic(topic_name)
-    topic.create()
-
-    topic = pubsub_client.topic(topic_name)
-    policy = topic.get_iam_policy()
-    publishers = policy.get('roles/pubsub.publisher', [])
-    if hasattr(publishers, "append"):
-        publishers.append(policy.service_account(
-                'cloud-iot@system.gserviceaccount.com'))
-    else:
-        publishers.add(policy.service_account(
-                'cloud-iot@system.gserviceaccount.com'))
-    policy['roles/pubsub.publisher'] = publishers
-    topic.set_iam_policy(policy)
+    pubsub_client = pubsub.PublisherClient()
+    topic_path = pubsub_client.topic_path(project, topic_name)
+
+    topic = pubsub_client.create_topic(topic_path)
+    policy = pubsub_client.get_iam_policy(topic_path)
+
+    policy.bindings.add(
+        role='roles/pubsub.publisher',
+        members=['serviceAccount:cloud-iot@system.gserviceaccount.com'])
+
+    pubsub_client.set_iam_policy(topic_path, policy)
 
     return topic
 
@@ -476,7 +472,7 @@ def run_command(args):
                 args.cloud_region, args.pubsub_topic, args.registry_id)
 
     elif args.command == 'create-topic':
-        create_iot_topic(args.pubsub_topic)
+        create_iot_topic(args.project_id, args.pubsub_topic)
 
     elif args.command == 'delete-device':
         delete_device(

samples/api-client/manager/manager_test.py

@@ -15,11 +15,10 @@
 import os
 import time
 
+from google.cloud import pubsub
 import pytest
-
 import manager
 
-
 cloud_region = 'us-central1'
 device_id_template = 'test-device-{}'
 es_cert_path = 'resources/ec_public.pem'
@@ -35,12 +34,13 @@
 
 @pytest.fixture(scope='module')
 def test_topic():
-    topic = manager.create_iot_topic(topic_id)
+    topic = manager.create_iot_topic(project_id, topic_id)
 
     yield topic
 
-    if topic.exists():
-        topic.delete()
+    pubsub_client = pubsub.PublisherClient()
+    topic_path = pubsub_client.topic_path(project_id, topic_id)
+    pubsub_client.delete_topic(topic_path)
 
 
 def test_create_delete_registry(test_topic, capsys):

samples/api-client/manager/requirements.txt

@@ -1,4 +1,4 @@
 google-api-python-client==1.6.4
 google-auth-httplib2==0.0.2
 google-auth==1.2.0
-google-cloud==0.28.0
+google-cloud==0.29.0