Skip to content

Instantly share code, notes, and snippets.

@siraj
Created September 10, 2020 14:02
Show Gist options
  • Save siraj/9eda4bdf3106e50d763a101e9828be97 to your computer and use it in GitHub Desktop.
Save siraj/9eda4bdf3106e50d763a101e9828be97 to your computer and use it in GitHub Desktop.
pika bug
import logging
import pika
import time
LOG_FORMAT = ('%(levelname) -1s %(asctime)s %(name) -1s %(funcName) '
'-1s %(lineno) -5d: %(message)s')
LOGGER = logging.getLogger(__name__)
user="user"
password="password"
host="localhost"
queue="test"
class amqpConsumer(object):
def __init__(self):
"""Create a new instance of the consumer class, passing in the AMQP
URL used to connect to RabbitMQ.
:param str amqp_url: The AMQP url to connect with
"""
self._connection = None
self._channel = None
self._closing = False
self._consumer_tag = None
def connect(self):
"""This method connects to RabbitMQ, returning the connection handle.
When the connection is established, the on_connection_open method
will be invoked by pika.
:rtype: pika.SelectConnection
"""
LOGGER.info('Connecting to %s', host)
credentials=pika.PlainCredentials(user, password)
return pika.SelectConnection(pika.ConnectionParameters(host=host,credentials=credentials,heartbeat_interval=0),
self.on_connection_open,
stop_ioloop_on_close=False)
def on_connection_open(self, unused_connection):
"""This method is called by pika once the connection to RabbitMQ has
been established. It passes the handle to the connection object in
case we need it, but in this case, we'll just mark it unused.
:type unused_connection: pika.SelectConnection
"""
LOGGER.info('Connection opened')
self.add_on_connection_close_callback()
self.open_channel()
def add_on_connection_close_callback(self):
"""This method adds an on close callback that will be invoked by pika
when RabbitMQ closes the connection to the publisher unexpectedly.
"""
LOGGER.info('Adding connection close callback')
self._connection.add_on_close_callback(self.on_connection_closed)
def on_connection_closed(self, connection, reply_code, reply_text):
"""This method is invoked by pika when the connection to RabbitMQ is
closed unexpectedly. Since it is unexpected, we will reconnect to
RabbitMQ if it disconnects.
:param pika.connection.Connection connection: The closed connection obj
:param int reply_code: The server provided reply_code if given
:param str reply_text: The server provided reply_text if given
"""
self._channel = None
if self._closing:
self._connection.ioloop.stop()
else:
LOGGER.warning('Connection closed, reopening in 5 seconds: (%s) %s',
reply_code, reply_text)
self._connection.add_timeout(5, self.reconnect)
def reconnect(self):
"""Will be invoked by the IOLoop timer if the connection is
closed. See the on_connection_closed method.
"""
# This is the old connection IOLoop instance, stop its ioloop
self._connection.ioloop.stop()
if not self._closing:
# Create a new connection
self._connection = self.connect()
# There is now a new connection, needs a new ioloop to run
self._connection.ioloop.start()
def open_channel(self):
"""Open a new channel with RabbitMQ by issuing the Channel.Open RPC
command. When RabbitMQ responds that the channel is open, the
on_channel_open callback will be invoked by pika.
"""
LOGGER.info('Creating a new channel')
self._connection.channel(on_open_callback=self.on_channel_open)
def on_channel_open(self, channel):
"""This method is invoked by pika when the channel has been opened.
The channel object is passed in so we can make use of it.
Since the channel is now open, we'll declare the exchange to use.
:param pika.channel.Channel channel: The channel object
"""
LOGGER.info('Channel opened')
self._channel = channel
self.add_on_channel_close_callback()
self.start_consuming()
def add_on_channel_close_callback(self):
"""This method tells pika to call the on_channel_closed method if
RabbitMQ unexpectedly closes the channel.
"""
LOGGER.info('Adding channel close callback')
self._channel.add_on_close_callback(self.on_channel_closed)
def on_channel_closed(self, channel, reply_code, reply_text):
"""Invoked by pika when RabbitMQ unexpectedly closes the channel.
Channels are usually closed if you attempt to do something that
violates the protocol, such as re-declare an exchange or queue with
different parameters. In this case, we'll close the connection
to shutdown the object.
:param pika.channel.Channel: The closed channel
:param int reply_code: The numeric reason the channel was closed
:param str reply_text: The text reason the channel was closed
"""
LOGGER.warning('Channel %i was closed: (%s) %s',
channel, reply_code, reply_text)
self._connection.close()
def start_consuming(self):
"""This method sets up the consumer by first calling
add_on_cancel_callback so that the object is notified if RabbitMQ
cancels the consumer. It then issues the Basic.Consume RPC command
which returns the consumer tag that is used to uniquely identify the
consumer with RabbitMQ. We keep the value to use it when we want to
cancel consuming. The on_message method is passed in as a callback pika
will invoke when a message is fully received.
"""
LOGGER.info('Issuing consumer related RPC commands')
self.add_on_cancel_callback()
self._channel.basic_qos(prefetch_count=1)
self._consumer_tag = self._channel.basic_consume(self.on_message,queue)
def add_on_cancel_callback(self):
"""Add a callback that will be invoked if RabbitMQ cancels the consumer
for some reason. If RabbitMQ does cancel the consumer,
on_consumer_cancelled will be invoked by pika.
"""
LOGGER.info('Adding consumer cancellation callback')
self._channel.add_on_cancel_callback(self.on_consumer_cancelled)
def on_consumer_cancelled(self, method_frame):
"""Invoked by pika when RabbitMQ sends a Basic.Cancel for a consumer
receiving messages.
:param pika.frame.Method method_frame: The Basic.Cancel frame
"""
LOGGER.info('Consumer was cancelled remotely, shutting down: %r',
method_frame)
if self._channel:
self._channel.close()
def on_message(self, unused_channel, basic_deliver, properties, body):
"""Invoked by pika when a message is delivered from RabbitMQ. The
channel is passed for your convenience. The basic_deliver object that
is passed in carries the exchange, routing key, delivery tag and
a redelivered flag for the message. The properties passed in is an
instance of BasicProperties with the message properties and the body
is the message that was sent.
:param pika.channel.Channel unused_channel: The channel object
:param pika.Spec.Basic.Deliver: basic_deliver method
:param pika.Spec.BasicProperties: properties
:param str|unicode body: The message body
"""
LOGGER.info('Received message # %s from %s',
basic_deliver.delivery_tag, properties.app_id)
time.sleep(10*60)
self.acknowledge_message(basic_deliver.delivery_tag)
def not_acknowledge_message(self, delivery_tag):
"""Not Acknowledge the message delivery from RabbitMQ by sending a
Basic.Nack RPC method for the delivery tag.
:param int delivery_tag: The delivery tag from the Basic.Deliver frame
"""
LOGGER.info('Not acknowledging message %s', delivery_tag)
self._channel.basic_nack(delivery_tag)
def acknowledge_message(self, delivery_tag):
"""Acknowledge the message delivery from RabbitMQ by sending a
Basic.Ack RPC method for the delivery tag.
:param int delivery_tag: The delivery tag from the Basic.Deliver frame
"""
LOGGER.info('Acknowledging message %s', delivery_tag)
self._channel.basic_ack(delivery_tag)
def stop_consuming(self):
"""Tell RabbitMQ that you would like to stop consuming by sending the
Basic.Cancel RPC command.
"""
if self._channel:
LOGGER.info('Sending a Basic.Cancel RPC command to RabbitMQ')
self._channel.basic_cancel(self.on_cancelok, self._consumer_tag,nowait=False)
def on_cancelok(self, unused_frame):
"""This method is invoked by pika when RabbitMQ acknowledges the
cancellation of a consumer. At this point we will close the channel.
This will invoke the on_channel_closed method once the channel has been
closed, which will in-turn close the connection.
:param pika.frame.Method unused_frame: The Basic.CancelOk frame
"""
LOGGER.info('RabbitMQ acknowledged the cancellation of the consumer')
self.close_channel()
def close_channel(self):
"""Call to close the channel with RabbitMQ cleanly by issuing the
Channel.Close RPC command.
"""
LOGGER.info('Closing the channel')
self._channel.close()
def run(self):
"""Run the example consumer by connecting to RabbitMQ and then
starting the IOLoop to block and allow the SelectConnection to operate.
"""
self._connection = self.connect()
self._connection.ioloop.start()
def stop(self):
"""Cleanly shutdown the connection to RabbitMQ by stopping the consumer
with RabbitMQ. When RabbitMQ confirms the cancellation, on_cancelok
will be invoked by pika, which will then closing the channel and
connection. The IOLoop is started again because this method is invoked
when CTRL-C is pressed raising a KeyboardInterrupt exception. This
exception stops the IOLoop which needs to be running for pika to
communicate with RabbitMQ. All of the commands issued prior to starting
the IOLoop will be buffered but not processed.
"""
LOGGER.info('Stopping')
self._closing = True
self.stop_consuming()
self.close_connection()
#self._connection.ioloop.start()
LOGGER.info('Stopped')
def close_connection(self):
"""This method closes the connection to RabbitMQ."""
LOGGER.info('Closing connection')
self._connection.close()
def main():
print ' [*] Waiting for messages. To exit press CTRL+C'
logging.basicConfig(level=logging.INFO, format=LOG_FORMAT)
consumer = amqpConsumer()
try:
consumer.run()
except KeyboardInterrupt:
consumer.stop()
if __name__ == '__main__':
main() # (this code was run as script)
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment