sb-pubsub-kafka 0.0.4

A kafka wrapper

My Kafka PubSub Library

Wraps kafka into nice little simple classes
One for publishing pub and one for both publish and subscribe pubsub
The system transfers messages wrapped in an independent json format.
This is the structure of a sample envelope:

class TestEnvelope(Envelope):
    Identifier = "TestEnvelope"
    msg: str

    def __init__(self, msg: str = "", correlation_id: uuid.UUID = uuid.uuid4()):
        super().__init__(correlation_id)
        self.msg = msg

    def __str__(self):
        return f"msg:{self.msg}"

The envelope then needs to be registered with EnvelopeMapper.register(TestEnvelope.Identifier, TestEnvelope)
This allows the subscriber to correctly identify and deserialize the envelope
The correlation_id is passed through automatically with each message, but it is up to you to use correctly - i.e. Assign the same id to a response message, etc.

The pubsub class is the most complex, it has an internal thread that polls for messages and invokes the correct callback based on the envelope type.
The bindings are done as follows: pubsub.bind(TestEnvelope, callback)
Where the callback is a static function that looks like this: callback(pubsub, obj, context) pubsub is the instance that raised the callback, obj is the deserialized envelope, and context is whatever you passed into the context parameter in __init__()
This allows you to create specific bindings for each envelope type.
There is a catch-all binding pubsub.bind_everything(callback) that maps to everything that doesn't have a specific binding.

Note that all messages need to follow the envelope pattern, or they won't work at all.

The message pattern is so that it can be used language-agnostically - the same library exists in C#, and coexists with the python libraries.

Building

python -m build

Deploying

python -m twine upload --repository dist/*