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mixins for tornado

Project description

tornadoist -currently- provides Mixins to execute code outside tornado.ioloop.IOLoop to avoid blocking. These are:

  • CeleryMixin: Celery Tasks
  • ProcessMixin: Functions in separate process

Both support results, avoids polling or timeouts. More info below.

Demo app included. (Celery with mongodb:// preconfigured in demo app)

CeleryMixin

CeleryMixin is a Mixin class to use with tornado.web.RequestHandler that provides a Tornado-like interface to running Celery tasks on TornadoServer.

HowTO

Using tornado.gen

from tornado import web, gen
from tornadoist import CeleryMixin

class CeleryHandler(tornado.web.RequestHandler, CeleryMixin):
    @web.asynchronous
    @gen.engine
    def get(self):
        result = yield gen.Task(self.add_task, some_task, 'somearg')
        self.write('Hello %s World!' % result)
        self.finish()

Or using explicit callback

class CeleryHandler(tornado.web.RequestHandler, CeleryMixin):
    @tornado.web.asynchronous
    def get(self):
        self.add_task(some_task, callback=self._on_result)

    def _on_result(self, result):
        do_something_with_result(result)
        self.finish()

ProcessMixin

ProcessMixin is a Mixin class to use with tornado.web.RequestHandler that provides a Tornado-like interface to running functions with multiprocessing.Process outside IOLoop.

HowTO

Using tornado.gen

from tornado import web, gen
from tornadoist import ProcessMixin

class ProcessHandler(tornado.web.RequestHandler, ProcessMixin):
    @tornado.web.asynchronous
    @tornado.gen.engine
    def get(self):
        result = yield tornado.gen.Task(self.add_task, my_blocking_function,
                                        'somearg', some_kwarg=42)
        self.write('Hello Process World! %s' % result)
        self.finish()

Project details


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0.5.2

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