fix: added cli functionality to dataproc quickstart example (GoogleCloudPlatform#2734)

* Added CLI functionality to quickstart

Author: bradmiro

dataproc/quickstart/quickstart.py

@@ -15,25 +15,25 @@
 # 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:
+    python 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 +125,35 @@ 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,
+        required=True,
+        help='Project to use for creating resources.')
+    parser.add_argument(
+        '--region',
+        type=str,
+        required=True,
+        help='Region where the resources should live.')
+    parser.add_argument(
+        '--cluster_name',
+        type=str,
+        required=True,
+        help='Name to use for creating a cluster.')
+    parser.add_argument(
+        '--job_file_path',
+        type=str,
+        required=True,
+        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]

dataproc/quickstart/quickstart_test.py

@@ -15,12 +15,11 @@
 import os
 import uuid
 import pytest
+import subprocess
 
 from google.cloud import dataproc_v1 as dataproc
 from google.cloud import storage
 
-import quickstart
-
 
 PROJECT_ID = os.environ['GCLOUD_PROJECT']
 REGION = 'us-central1'
@@ -29,10 +28,10 @@
 JOB_FILE_NAME = 'sum.py'
 JOB_FILE_PATH = 'gs://{}/{}'.format(STAGING_BUCKET, JOB_FILE_NAME)
 SORT_CODE = (
-  "import pyspark\n"
-  "sc = pyspark.SparkContext()\n"
-  "rdd = sc.parallelize((1,2,3,4,5))\n"
-  "sum = rdd.reduce(lambda x, y: x + y)\n"
+    "import pyspark\n"
+    "sc = pyspark.SparkContext()\n"
+    "rdd = sc.parallelize((1,2,3,4,5))\n"
+    "sum = rdd.reduce(lambda x, y: x + y)\n"
 )
 
 
@@ -60,10 +59,16 @@ def setup_teardown():
     blob.delete()
 
 
-def test_quickstart(capsys):
-    quickstart.quickstart(PROJECT_ID, REGION, CLUSTER_NAME, JOB_FILE_PATH)
+def test_quickstart():
+    command = [
+        'python', 'quickstart/quickstart.py',
+        '--project_id', PROJECT_ID,
+        '--region', REGION,
+        '--cluster_name', CLUSTER_NAME,
+        '--job_file_path', JOB_FILE_PATH
+    ]
+    out = subprocess.check_output(command).decode("utf-8")
 
-    out, _ = capsys.readouterr()
     assert 'Cluster created successfully' in out
     assert 'Submitted job' in out
     assert 'finished with state DONE:' in out