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POHow to do OAuth-requiring operations in a GAE Task Queue?
 

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  1. POHow to do OAuth-requiring operations in a GAE Task Queue?
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    <p>I have a simple Google App Engine app that includes a <code>/update</code> page which updates a YouTube playlist. It looks like this:</p> <pre><code>class UpdatePage(webapp2.RequestHandler): @decorator.oauth_required def get(self): update_result = self.update_playlist() ... routes = [('/update', UpdatePage), (decorator.callback_path, decorator.callback_handler())] app = webapp2.WSGIApplication(routes, debug=True) </code></pre> <p>It works as expected and the <code>update_playlist()</code> method does its job, but it turns out that under some circumstances it can run for a pretty long time, resulting in a <code>DeadlineExceededError</code>. So after reading about the available options, I figured the <em>Task Queue</em> API is the way to go (right?) and I'm trying to use it, following the <a href="https://developers.google.com/appengine/docs/python/taskqueue/overview-push#Using_Push_Queues_in_Python" rel="nofollow">Using Push Queues in Python</a> guide.</p> <p>&rarr; In short, I split <code>UpdatePage</code> into <code>UpdatePageHandler</code> + <code>UpdatePageWorker</code>:</p> <pre><code>class UpdateHandlerPage(webapp2.RequestHandler): @decorator.oauth_required def get(self): taskqueue.add(url='/updateworker') class UpdateWorkerPage(webapp2.RequestHandler): def post(self): update_result = self.update_playlist() ... routes = [('/update', UpdateHandlerPage), ('/updateworker', UpdateWorkerPage), (decorator.callback_path, decorator.callback_handler())] app = webapp2.WSGIApplication(routes, debug=True) </code></pre> <p>Unfortunately, after doing the split it seems my OAuth2 decorator no longer does its job:</p> <pre><code>INFO 2013-05-30 17:08:53,971 discovery.py:709] URL being requested: https://www.googleapis.com/youtube/v3/playlists?alt=json&amp;part=snippet%2Cstatus WARNING 2013-05-30 17:08:53,975 urlfetch_stub.py:480] Stripped prohibited headers from URLFetch request: ['content-length'] INFO 2013-05-30 17:08:54,351 client.py:493] Refreshing due to a 401 INFO 2013-05-30 17:08:54,361 appengine.py:276] make: Got type &lt;class 'google.appengine.api.datastore_types.Blob'&gt; INFO 2013-05-30 17:08:54,363 appengine.py:289] validate: Got type &lt;class 'oauth2client.client.OAuth2Credentials'&gt; INFO 2013-05-30 17:08:54,364 client.py:680] Refreshing access_token INFO 2013-05-30 17:08:54,746 client.py:699] Failed to retrieve access token: { "error" : "invalid_grant" } INFO 2013-05-30 17:08:54,757 appengine.py:276] make: Got type &lt;class 'google.appengine.api.datastore_types.Blob'&gt; INFO 2013-05-30 17:08:54,759 appengine.py:289] validate: Got type &lt;class 'oauth2client.client.OAuth2Credentials'&gt; INFO 2013-05-30 17:08:54,761 appengine.py:289] validate: Got type &lt;class 'oauth2client.client.OAuth2Credentials'&gt; INFO 2013-05-30 17:08:54,762 appengine.py:265] get: Got type &lt;class 'oauth2client.appengine.CredentialsModel'&gt; </code></pre> <p>And if instead of decorating <code>UpdateHandlerPage:get</code> I decorate <code>UpdateWorkerPage:post</code>, I get an infinite failure loop instead:</p> <pre><code>INFO 2013-05-30 17:24:31,307 discovery.py:190] URL being requested: https://www.googleapis.com/discovery/v1/apis/youtube/v3/rest?userIp=127.0.0.1 INFO 2013-05-30 17:24:34,960 dev_appserver.py:3105] "GET /update HTTP/1.1" 200 - INFO 2013-05-30 17:24:35,060 dev_appserver.py:3105] "POST /updateworker HTTP/1.1" 302 - WARNING 2013-05-30 17:24:35,065 taskqueue_stub.py:1980] Task task1 failed to execute. This task will retry in 0.100 seconds INFO 2013-05-30 17:24:35,240 dev_appserver.py:3105] "POST /updateworker HTTP/1.1" 302 - WARNING 2013-05-30 17:24:35,245 taskqueue_stub.py:1980] Task task1 failed to execute. This task will retry in 0.200 seconds ... </code></pre> <p>What can I do? Thanks for your help!</p>
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