Knative kafka 版本和 python 支持

Question

I want to use Knative for kafka event trigger. I found a good doc around it https://knative.dev/docs/eventing/samples/kafka/source/index.html .

My questions are:

1. Does it support kafka version 2.5 or higher?

2. I want to write code in python and the file that i came across is in go. https://github.com/knative/eventing-contrib/blob/master/cmd/event_display/main.go

All i want to know can i have the same in python? or would i need a docker image that will use python as base image also in that case what would be the function syntax?

def consumer(context, event):
    context.logger.debug(event.body)
    print(event.trigger.kind)

I want something like this in Knative event trigger (python)

Answer 1

1. It supports Kafka 2.5, 2.6 not (yet)
2. You can write code in python and you need to build a container image by yourself.

The service or URL referenced by spec.sink can be written in any language and in your target language you need to start an HTTP server and listen for events.

In your case, I suggest looking at the Python CloudEvents SDK documentation for receiving events that contains a useful example using Flask: https://github.com/cloudevents/sdk-python/tree/v1.0.0-stable#request-to-cloudevent .

So, the Knative service in the Kafka Source example needs to reference your custom container image:

# ...
spec:
  template:
    spec:
      containers:
          image: <your_custom_container_image>

Also, spec.sink can be a Kubernetes service. The following is an example configuration to deliver events to a custom path my-custom-path for a Kubernetes service my-service :

spec:
  # ...
  sink:
    ref:
      apiVersion: v1
      kind: Service
      name: my-service
    uri: /my-custom-path