pulsar-functions/python-examples/typed_message_builder_publish.py

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import time
from pulsar import Function

# Example function that uses the built in publish function in the context
# to publish to a desired topic based on config
class TypedMessageBuilderPublish(Function):
  def __init__(self):
    pass

  def process(self, input, context):
    publish_topic = "publishtopic"
    if "publish-topic" in context.get_user_config_map():
      publish_topic = context.get_user_config_value("publish-topic")
    context.publish(publish_topic, input + '!',
                    message_conf={"properties": {k: v for d in [{"input_topic" : context.get_current_message_topic_name()}, context.get_message_properties()] for k, v in d.items()},
                                  "partition_key": context.get_partition_key(),
                                  "event_timestamp": int(time.time())})
    return