New snippet to delete notification channel [(#1920)](GoogleCloudPlatf…

…orm/python-docs-samples#1920)

New snippet to delete notification channel

samples/snippets/v3/alerts-client/snippets.py

@@ -90,6 +90,23 @@ def replace_notification_channels(project_name, alert_policy_id, channel_ids):
 # [END monitoring_alert_replace_channels]
 
 
+# [START monitoring_alert_delete_channel]
+def delete_notification_channels(project_name, channel_ids, force=None):
+    channel_client = monitoring_v3.NotificationChannelServiceClient()
+    for channel_id in channel_ids:
+        channel_name = '{}/notificationChannels/{}'.format(
+            project_name, channel_id)
+        try:
+            channel_client.delete_notification_channel(
+                channel_name, force=force)
+            print('Channel {} deleted'.format(channel_name))
+        except ValueError:
+            print('The parameters are invalid')
+        except Exception as e:
+            print('API call failed: {}'.format(e))
+# [END monitoring_alert_delete_channel]
+
+
 # [START monitoring_alert_backup_policies]
 def backup(project_name):
     alert_client = monitoring_v3.AlertPolicyServiceClient()

samples/snippets/v3/alerts-client/snippets_test.py

@@ -63,8 +63,9 @@ def __enter__(self):
     def __exit__(self, type, value, traceback):
         # Delete the policy and channel we created.
         self.alert_policy_client.delete_alert_policy(self.alert_policy.name)
-        self.notification_channel_client.delete_notification_channel(
-            self.notification_channel.name)
+        if self.notification_channel.name:
+            self.notification_channel_client.delete_notification_channel(
+                self.notification_channel.name)
 
 
 @pytest.fixture(scope='session')
@@ -114,3 +115,12 @@ def test_backup_and_restore(capsys, pochan):
     assert "Updated {0}".format(pochan.alert_policy.name) in out
     assert "Updating channel {0}".format(
         pochan.notification_channel.display_name) in out
+
+
+def test_delete_channels(capsys, pochan):
+    notification_channel_id = pochan.notification_channel.name.split('/')[-1]
+    snippets.delete_notification_channels(
+        pochan.project_name, [notification_channel_id], force=True)
+    out, _ = capsys.readouterr()
+    assert "{0} deleted".format(notification_channel_id) in out
+    pochan.notification_channel.name = ''   # So teardown is not tried