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POTornado celery integration hacks
 

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    <p>Since nobody provided a solution to <a href="https://stackoverflow.com/questions/7934675/invoke-celery-task-from-tornado">this post</a> plus the fact that I desperately need a workaround, here is my situation and some abstract solutions/ideas for debate.</p> <p><strong>My stack:</strong></p> <ol> <li>Tornado</li> <li>Celery</li> <li>MongoDB</li> <li>Redis</li> <li>RabbitMQ</li> </ol> <p>My problem: Find a way for Tornado to dispatch a celery task ( solved ) and then asynchronously gather the result ( any ideas? ).</p> <p><strong>Scenario 1: (request/response hack plus webhook)</strong></p> <ul> <li>Tornado receives a (user)request, then saves in local memory (or in Redis) a { jobID : (user)request} to remember where to propagate the response, and fires a celery task with jobID</li> <li>When celery completes the task, it performs a webhook at some url and tells tornado that this jobID has finished ( plus the results )</li> <li>Tornado retrieves the (user)request and forwards a response to the (user)</li> </ul> <p>Can this happen? Does it have any logic?</p> <p><strong>Scenario 2: (tornado plus long-polling)</strong></p> <ul> <li>Tornado dispatches the celery task and returns some primary json data to the client (jQuery)</li> <li>jQuery does some long-polling upon receipt of the primary json, say, every x microseconds, and tornado replies according to some database flag. When the celery task completes, this database flag is set to True, then jQuery "loop" is finished.</li> </ul> <p>Is this efficient? </p> <p>Any other ideas/schemas?</p>
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