Remove usage of GoogleCredentials [(#810)](GoogleCloudPlatform/python-docs-samples#810)

Author: Jon Wayne Parrott

samples/snippets/v3/api-client/custom_metric_test.py

@@ -25,15 +25,15 @@
 
 from gcp.testing import eventually_consistent
 from gcp.testing.flaky import flaky
+import googleapiclient.discovery
+import pytest
 
 from custom_metric import create_custom_metric
 from custom_metric import delete_metric_descriptor
 from custom_metric import get_custom_metric
 from custom_metric import read_timeseries
 from custom_metric import write_timeseries_value
 
-import list_resources
-
 """ Custom metric domain for all custom metrics"""
 CUSTOM_METRIC_DOMAIN = "custom.googleapis.com"
 
@@ -44,10 +44,14 @@
     CUSTOM_METRIC_DOMAIN, METRIC_NAME)
 
 
+@pytest.fixture(scope='module')
+def client():
+    return googleapiclient.discovery.build('monitoring', 'v3')
+
+
 @flaky
-def test_custom_metric(cloud_config):
+def test_custom_metric(cloud_config, client):
     PROJECT_RESOURCE = "projects/{}".format(cloud_config.project)
-    client = list_resources.get_client()
     # Use a constant seed so psuedo random number is known ahead of time
     random.seed(1)
     pseudo_random_value = random.randint(0, 10)

samples/snippets/v3/api-client/list_resources.py

@@ -27,8 +27,7 @@
 import datetime
 import pprint
 
-from apiclient import discovery
-from oauth2client.client import GoogleCredentials
+import googleapiclient.discovery
 
 
 def format_rfc3339(datetime_instance):
@@ -96,17 +95,10 @@ def list_timeseries(client, project_resource, metric):
     print('list_timeseries response:\n{}'.format(pprint.pformat(response)))
 
 
-def get_client():
-    """Builds an http client authenticated with the service account
-    credentials."""
-    credentials = GoogleCredentials.get_application_default()
-    client = discovery.build('monitoring', 'v3', credentials=credentials)
-    return client
-
-
 def main(project_id):
+    client = googleapiclient.discovery.build('monitoring', 'v3')
+
     project_resource = "projects/{}".format(project_id)
-    client = get_client()
     list_monitored_resource_descriptors(client, project_resource)
     # Metric to list
     metric = 'compute.googleapis.com/instance/cpu/usage_time'

samples/snippets/v3/api-client/list_resources_test.py

@@ -23,16 +23,22 @@
 import re
 
 from gcp.testing.flaky import flaky
+import googleapiclient.discovery
+import pytest
 
 import list_resources
 
 METRIC = 'compute.googleapis.com/instance/cpu/usage_time'
 
 
+@pytest.fixture(scope='module')
+def client():
+    return googleapiclient.discovery.build('monitoring', 'v3')
+
+
 @flaky
-def test_list_monitored_resources(cloud_config, capsys):
+def test_list_monitored_resources(cloud_config, client, capsys):
     PROJECT_RESOURCE = "projects/{}".format(cloud_config.project)
-    client = list_resources.get_client()
     list_resources.list_monitored_resource_descriptors(
         client, PROJECT_RESOURCE)
     stdout, _ = capsys.readouterr()
@@ -42,9 +48,8 @@ def test_list_monitored_resources(cloud_config, capsys):
 
 
 @flaky
-def test_list_metrics(cloud_config, capsys):
+def test_list_metrics(cloud_config, client, capsys):
     PROJECT_RESOURCE = "projects/{}".format(cloud_config.project)
-    client = list_resources.get_client()
     list_resources.list_metric_descriptors(
         client, PROJECT_RESOURCE, METRIC)
     stdout, _ = capsys.readouterr()
@@ -54,9 +59,8 @@ def test_list_metrics(cloud_config, capsys):
 
 
 @flaky
-def test_list_timeseries(cloud_config, capsys):
+def test_list_timeseries(cloud_config, client, capsys):
     PROJECT_RESOURCE = "projects/{}".format(cloud_config.project)
-    client = list_resources.get_client()
     list_resources.list_timeseries(
         client, PROJECT_RESOURCE, METRIC)
     stdout, _ = capsys.readouterr()