chore(functions/pubsub): use consistent param names (GoogleCloudPlatform#4823)

Co-authored-by: Takashi Matsuo <tmatsuo@google.com>

Author: Ace Nassri

functions/pubsub/main.py

@@ -22,7 +22,7 @@
 
 # Instantiates a Pub/Sub client
 publisher = pubsub_v1.PublisherClient()
-PROJECT_ID = os.getenv('GCP_PROJECT')
+PROJECT_ID = os.getenv('GOOGLE_CLOUD_PROJECT')
 
 
 # Publishes a message to a Cloud Pub/Sub topic.
@@ -33,7 +33,7 @@ def publish(request):
     message = request_json.get("message")
 
     if not topic_name or not message:
-        return ('Missing "topic" and/or "subscription" parameter.', 500)
+        return ('Missing "topic" and/or "message" parameter.', 400)
 
     print(f'Publishing message to topic {topic_name}')
 

functions/pubsub/main_test.py

@@ -28,7 +28,7 @@ def test_functions_pubsub_publish_should_fail_without_params():
     request.get_json.return_value = {}
     response = main.publish(request)
 
-    assert 'Missing "topic" and/or "subscription" parameter.' in response
+    assert 'Missing "topic" and/or "message" parameter.' in response
 
 
 def test_functions_pubsub_publish_should_publish_message():