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POChannels and TaskQueues in Google App Engine (client debugging)
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copied!<p>I'm trying to build and debug my first GAE application and have already benefited from the awesome support of Stackoverflowers to get where I am in having tasks being processed on the default queue. Thanks!</p> <p>However, I wanted to use Queues to demonstrate how you would do some 'long' work in the background. My idea was:</p> <ol> <li>Receive a request to process a large file. </li> <li>Store the file and enqueue a task.</li> <li>Return the response.</li> <li>Process the file on the background.</li> <li>Let the client know, via a Channel, that the work is done!</li> </ol> <p>I have all this working but for one problem. On my development server the Task Queue doesn't seem to process tasks in the background. To simulate long running work I just popped a sleep in there.</p> <pre><code>def post(self): time.sleep(60) #use a channel to let the client know we're done </code></pre> <p>It appears that the GAE development server is single threaded. It doesn't respond at all until the item has been processed off the queue? Is this assumption right? Any ideas?</p> <p>Thanks</p> <p>Adding code exanples:</p> <pre><code>#code to enqueue task taskqueue.add(url='/processSubmission', params={'key': activity.key() }, transactional=False) #class that processes queued work class ProcessSubmission(webapp.RequestHandler): def post (self): time.sleep(60) activity = db.get(db.Key(encoded=self.request.get('key'))) activity.approved = True activity.put() channel.send_message(activity.userid, 'Wahoo! we are done') </code></pre>

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