#!/usr/bin/env python3

import pulsar

client = pulsar.Client("pulsar://localhost:6650")

consumer = client.subscribe('my-topic', 'my-subscription')

while True:
    msg = consumer.receive()
    try:
        print("Received message '{}' id='{}'".format(
            msg.data(), msg.message_id()
        ))
        # Acknowledge successful processing of the message
        consumer.acknowledge(msg)
    except Exception:
        # Message failed to be processed
        consumer.negative_acknowledge(msg)

client.close()