Add support for overwrite attributes (GoogleCloudPlatform#1142)

BrandonY · Jon Wayne Parrott · commit 954b6fbe83a4 · 2017-09-27T12:13:31.000-07:00
* Add support for overwrite attributes, bug fixes

* Lint fix for overwrite line

* Switch variable to snake_case
diff --git a/storage/cloud-client/notification_polling.py b/storage/cloud-client/notification_polling.py
@@ -41,7 +41,7 @@
    $ gcloud beta pubsub subscriptions create testsubscription --topic=testtopic
 
 6. Run this program:
-   $ python notification_polling my-project-id testsubscription
+   $ python notification_polling.py my-project-id testsubscription
 
 7. While the program is running, upload and delete some files in the testbucket
    bucket (you could use the console or gsutil) and watch as changes scroll by
@@ -64,6 +64,8 @@ def summarize(message):
     bucket_id = attributes['bucketId']
     object_id = attributes['objectId']
     generation = attributes['objectGeneration']
+    overwrote_generation = attributes['overwroteGeneration']
+    overwritten_by_generation = attributes['overwrittenByGeneration']
     description = (
         '\tEvent type: {event_type}\n'
         '\tBucket ID: {bucket_id}\n'
@@ -74,6 +76,12 @@ def summarize(message):
             object_id=object_id,
             generation=generation)
 
+    if overwrote_generation:
+        description += '\tOverwrote generation: %s\n' % overwrote_generation
+    if overwritten_by_generation:
+        description += '\tOverwritten by generation: %s\n' % (
+            overwritten_by_generation)
+
     payload_format = attributes['payloadFormat']
     if payload_format == 'JSON_API_V1':
         object_metadata = json.loads(data)
@@ -99,7 +107,7 @@ def poll_notifications(project, subscription_name):
         project, subscription_name)
 
     def callback(message):
-        print('Received message:\n{1}'.format(summarize(message)))
+        print('Received message:\n{}'.format(summarize(message)))
         message.ack()
 
     subscriber.subscribe(subscription_path, callback=callback)
