pulsar-functions/python-examples/logging_function.py

#
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from pulsar import Function

# A function that demonstrates how to redirect logging to a topic.
# In this particular example, for every input string, the function
# does some logging. If --logTopic topic is specified, these log
# statements end up in that specified pulsar topic
class LoggingFunction(Function):
  def __init__(self):
    pass

  def process(self, input, context):
    context.get_logger().info(input + '-log')
    return input + '!'