Edx-event-bus-kafka

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Changed
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* **Breaking changes** ``EventProducerKafka`` is now ``KafkaEventProducer``
* KafkaEventConsumer is now part of the public API

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Added
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* Topic names can be autoprefixed by setting ``EVENT_BUS_TOPIC_PREFIX``

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Added
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* Producer now polls on an interval, improving callback reliability. Configurable with ``EVENT_BUS_KAFKA_POLL_INTERVAL_SEC``.

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Changed
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* **Breaking change**: Public API is now defined in ``edx_event_bus_kafka`` package and ``edx_event_bus_kafka.management.commands`` package; all other modules should be considered unstable and not for external use.

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Fixed
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* Various lint issues (and missing ``__init__.py`` files.)

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Changed
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* **Breaking changes** in the producer module, refactored to expose a better API:

* Rather than ``send_to_event_bus(...)``, relying code should now call ``get_producer().send(...)``.
* The ``sync`` kwarg is gone; to flush and sync messages before shutdown, call ``get_producer().prepare_for_shutdown()`` instead.

* Clarify that config module is for internal use only.
* Implementation changes: Only a single Producer is created, and is used for all signals.