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POinvoke celery task from tornado
 

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    <p>How can someone invoke a celery task from tornado, and get the result via a callback? </p> <p>This <a href="http://www.toforge.com/2011/01/run-celery-tasks-from-php/" rel="nofollow">post</a> claims that someone must simply put a message via RabbitMQ and then the task shall be executed. This makes sense, but can someone give an example in python (even better in tornado, with a callback)? Personally, I use mongodb as my message broker, but I can switch to Redis or RabbitMQ as well..</p> <p>EDIT: To clarify things, I want an example with a callback. For example, this tornado code</p> <pre><code>TestTask.delay(callback = self._on_celery_response) ... def _on_celery_response(self, result): print "hello from _on_celery_repsonse" , result </code></pre> <p>does not work. My TestTask is:</p> <pre><code>class TestTask(Task): name = "tornadoServer.Test" def run(self, callback=None, **kwargs): result = {'result': "hello from celery task invoked by tornado"} if callback is not None: subtask(callback).delay(result) return result </code></pre> <p>and the traceback:</p> <pre><code> File "/home/hymloth/Desktop/DJANGO/NOO1/tornadoServer/tornado/stack_context.py", line 183, in wrapped callback(*args, **kwargs) File "/home/hymloth/Desktop/DJANGO/NOO1/tornadoServer/asyncmongo/connection.py", line 183, in _parse_response callback(response) File "/home/hymloth/Desktop/DJANGO/NOO1/tornadoServer/asyncmongo/cursor.py", line 399, in _handle_response orig_callback(result['data'], error=None) File "/home/hymloth/Desktop/DJANGO/NOO1/tornadoServer/basic_auth_handlers.py", line 66, in _on_response celery_tasks.TestTask.delay(self._on_celery_response) File "/usr/local/lib/python2.6/dist-packages/celery-2.2.7-py2.6.egg/celery/task/base.py", line 338, in delay return self.apply_async(args, kwargs) File "/usr/local/lib/python2.6/dist-packages/celery-2.2.7-py2.6.egg/celery/task/base.py", line 460, in apply_async **options) File "/usr/local/lib/python2.6/dist-packages/celery-2.2.7-py2.6.egg/celery/app/amqp.py", line 230, in delay_task send(body, exchange=exchange, **extract_msg_options(kwargs)) File "/usr/local/lib/python2.6/dist-packages/kombu-1.1.6-py2.6.egg/kombu/compat.py", line 101, in send return self.publish(*args, **kwargs) File "/usr/local/lib/python2.6/dist-packages/kombu-1.1.6-py2.6.egg/kombu/messaging.py", line 124, in publish compression, headers) File "/usr/local/lib/python2.6/dist-packages/kombu-1.1.6-py2.6.egg/kombu/messaging.py", line 147, in _prepare body) = encode(body, serializer=serializer) File "/usr/local/lib/python2.6/dist-packages/kombu-1.1.6-py2.6.egg/kombu/serialization.py", line 119, in encode payload = encoder(data) File "/usr/lib/python2.6/copy_reg.py", line 70, in _reduce_ex raise TypeError, "can't pickle %s objects" % base.__name__ TypeError: can't pickle instancemethod objects </code></pre> <p>The Task works ok without the callback.. Any suggestions?</p>
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