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A.K.A Doctor Octopus
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README.rst

Octavious

https://github.com/metglobal/octavious/raw/master/dococtopus.gif

Octavious is a very lightweight concurrency framework helps you parallelize your tasks through a plugin pipeline system.

Currently it supports concurrency technologies such as:

  • Multiprocessing (python builtin)
  • Threading (python builtin)
  • Celery (message Queues)
  • Gevent (green threads)

Quick Overview

Processor

First of all, you have to define your processor that's going to be working as parallelized. Let's have look at the example below.

# processes/chucknjoke.py
import urllib
from octavious.processor import Processor

class ChuckNJokeProcessor(Processor):
    def process(self, input):
        url = 'http://api.icndb.com/jokes/%s' % input
        return urllib.urlopen(url % input).read()

processor = ChuckNJokeProcessor

In this example defined, ChuckNJokeProcessor joins to given url and brings the Chuck Norris Jokes as parallelized that are going to be processed via the plugins.

Plugin

Plugins already have methods such as pre-process and post-process. If you want to make changes on your input data coming from your processor you have to implement the defined pre-process, and if you want to make changes on output data you have to implement the defined post process.

As you may see in the example below, this is our first plugin. We are going to take the RAW JSON data and decode.

# plugins/jsondeserializer.py
import json
from octavious.pipeline import Plugin

class JsonDeserializerPlugin(Plugin):
    def post_process(self, input, output):
        return json.loads(output)

plugin = JsonDeserializerPlugin

And our second plugin

# plugins/dictdigger.py
from octavious.pipeline import Plugin

class DictDiggerPlugin(Plugin):
    def __init__(self, path):
        self.path = path

    def post_process(self, input, output):
        entry = output
        for component in self.path.split('.'):
            entry = entry.get(component)
        return entry

plugin = DictDiggerPlugin

This is for getting what data we want from tree structured dictionary.

Pipeline

Pipelines are for running the plugins in the sequence that we desire. You can create a pipeline with a bunch of plugins just like below.

from octavious.utils import pipeline, plugin

chuck_norris_pipeline = pipeline(
    plugin('chuck_norris.plugins.dictdigger', 'value.joke'),
    plugin('chuck_norris.plugins.jsondeserializer'),
)

Parallelizer

As above we have 4 parallelizer options implemented for Octavious. You can set the parallelizer settings like below

chuck_norris_parallellizer = parallelizer(
    'octavious.parallelizer.multiprocessing')

You can also use desired parallelizer backend with choice of

  • octavious.parallelizer.threading
  • octavious.parallelizer.gevent
  • octavious.parallelizer.celery
  • octavious.parallelizer.eventlet

Convenient Processors

There are some auxiliary Processor implementations help you define parallelizing workflows.

  • OneToManyProcessor wraps your processors to work with just one input.
  • ManyToOneProcessor wraps your processor to works with multiple inputs.

We are going to work with ManyToOneProcessor in ChuckNorris example. This is our last setting below as a summary, that we will make our code work.

from octavious.utils import pipeline, processor, plugin, parallelizer
from octavious.processor import ManyToOneProcessor, PipelineProcessor

chn_processor = processor('chuck_norris.processes.chucknjoke')
chn_parallellizer = parallelizer('octavious.parallelizer.gevent')
chn_pipeline = pipeline(
    plugin('chuck_norris.plugins.dictdigger', 'value.joke'),
    plugin('chuck_norris.plugins.jsondeserializer'),
)

manytoone = ManyToOneProcessor(
              PipelineProcessor(cnj_processor, chn_pipeline),
              chn_parallelizer)

for result in manytoone(range(1, 4)):
    print '*', result

Run the example app

$ python -m examples.simple
* Chuck Norris uses ribbed condoms inside out, so he gets the pleasure.
* Chuck Norris doesn't read books. He stares them down until he gets the information he wants.
* MacGyver can build an airplane out of gum and paper clips. Chuck Norris can kill him and take it.

Tests

Octavious has a bunch of unit tests. To run them, simply type

$ python -m unittest -v octavious.tests
test_pipeline (octavious.tests.TestPipeline) ... ok
test_call_symbol (octavious.tests.TestUtils) ... ok
test_load_symbol (octavious.tests.TestUtils) ... ok

----------------------------------------------------------------------
Ran 3 tests in 0.001s

OK

Status

Currently in very early stages, please stay tuned!

License

Copyright (c) 2013 Metglobal LLC.

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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