Added CLI functionality to quickstart

Author: bradmiro

dataproc/quickstart/quickstart.py

@@ -15,25 +15,24 @@
 # limitations under the License.
 
 # [START dataproc_quickstart]
+"""This quickstart sample walks a user through creating a Cloud Dataproc
+    cluster, submitting a PySpark job from Google Cloud Storage to the
+    cluster, reading the output of the job and deleting the cluster, all
+    using the Python client library.
+
+    Usage:
+        python3 quickstart.py --project_id <PROJECT_ID> --region <REGION> \
+            --cluster_name <CLUSTER_NAME> --job_file_path <GCS_JOB_FILE_PATH>
+"""
+
+import argparse
 import time
 
 from google.cloud import dataproc_v1 as dataproc
 from google.cloud import storage
 
 
 def quickstart(project_id, region, cluster_name, job_file_path):
-    """This quickstart sample walks a user through creating a Cloud Dataproc
-       cluster, submitting a PySpark job from Google Cloud Storage to the
-       cluster, reading the output of the job and deleting the cluster, all
-       using the Python client library.
-
-       Args:
-           project_id (string): Project to use for creating resources.
-           region (string): Region where the resources should live.
-           cluster_name (string): Name to use for creating a cluster.
-           job_file_path (string): Job in GCS to execute against the cluster.
-    """
-
     # Create the cluster client.
     cluster_client = dataproc.ClusterControllerClient(client_options={
         'api_endpoint': '{}-dataproc.googleapis.com:443'.format(region)
@@ -125,4 +124,23 @@ def quickstart(project_id, region, cluster_name, job_file_path):
     operation.result()
 
     print('Cluster {} successfully deleted.'.format(cluster_name))
-    # [END dataproc_quickstart]
+
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser(
+        description=__doc__,
+        formatter_class=argparse.RawDescriptionHelpFormatter,
+    )
+    parser.add_argument('--project_id', type=str,
+                        help='Project to use for creating resources.')
+    parser.add_argument('--region', type=str,
+                        help='Region where the resources should live.')
+    parser.add_argument('--cluster_name', type=str,
+                        help='Name to use for creating a cluster')
+    parser.add_argument('--job_file_path', type=str,
+                        help='Job in GCS to execute against the cluster.')
+
+    args = parser.parse_args()
+    quickstart(args.project_id, args.region,
+               args.cluster_name, args.job_file_path)
+# [END dataproc_quickstart]