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"""Carrot compatibility interface.
See https://pypi.org/project/carrot/ for documentation.
"""
from __future__ import absolute_import, unicode_literals
from itertools import count
from . import messaging
from .entity import Exchange, Queue
from .five import items
__all__ = ('Publisher', 'Consumer')
# XXX compat attribute
entry_to_queue = Queue.from_dict
def _iterconsume(connection, consumer, no_ack=False, limit=None):
consumer.consume(no_ack=no_ack)
for iteration in count(0): # for infinity
if limit and iteration >= limit:
break
yield connection.drain_events()
class Publisher(messaging.Producer):
"""Carrot compatible producer."""
exchange = ''
exchange_type = 'direct'
routing_key = ''
durable = True
auto_delete = False
_closed = False
def __init__(self, connection, exchange=None, routing_key=None,
exchange_type=None, durable=None, auto_delete=None,
channel=None, **kwargs):
if channel:
connection = channel
self.exchange = exchange or self.exchange
self.exchange_type = exchange_type or self.exchange_type
self.routing_key = routing_key or self.routing_key
if auto_delete is not None:
self.auto_delete = auto_delete
if durable is not None:
self.durable = durable
if not isinstance(self.exchange, Exchange):
self.exchange = Exchange(name=self.exchange,
type=self.exchange_type,
routing_key=self.routing_key,
auto_delete=self.auto_delete,
durable=self.durable)
super(Publisher, self).__init__(connection, self.exchange, **kwargs)
def send(self, *args, **kwargs):
return self.publish(*args, **kwargs)
def close(self):
super(Publisher, self).close()
self._closed = True
def __enter__(self):
return self
def __exit__(self, *exc_info):
self.close()
@property
def backend(self):
return self.channel
class Consumer(messaging.Consumer):
"""Carrot compatible consumer."""
queue = ''
exchange = ''
routing_key = ''
exchange_type = 'direct'
durable = True
exclusive = False
auto_delete = False
_closed = False
def __init__(self, connection, queue=None, exchange=None,
routing_key=None, exchange_type=None, durable=None,
exclusive=None, auto_delete=None, **kwargs):
self.backend = connection.channel()
if durable is not None:
self.durable = durable
if exclusive is not None:
self.exclusive = exclusive
if auto_delete is not None:
self.auto_delete = auto_delete
self.queue = queue or self.queue
self.exchange = exchange or self.exchange
self.exchange_type = exchange_type or self.exchange_type
self.routing_key = routing_key or self.routing_key
exchange = Exchange(self.exchange,
type=self.exchange_type,
routing_key=self.routing_key,
auto_delete=self.auto_delete,
durable=self.durable)
queue = Queue(self.queue,
exchange=exchange,
routing_key=self.routing_key,
durable=self.durable,
exclusive=self.exclusive,
auto_delete=self.auto_delete)
super(Consumer, self).__init__(self.backend, queue, **kwargs)
def revive(self, channel):
self.backend = channel
super(Consumer, self).revive(channel)
def close(self):
self.cancel()
self.backend.close()
self._closed = True
def __enter__(self):
return self
def __exit__(self, *exc_info):
self.close()
def __iter__(self):
return self.iterqueue(infinite=True)
def fetch(self, no_ack=None, enable_callbacks=False):
if no_ack is None:
no_ack = self.no_ack
message = self.queues[0].get(no_ack)
if message:
if enable_callbacks:
self.receive(message.payload, message)
return message
def process_next(self):
raise NotImplementedError('Use fetch(enable_callbacks=True)')
def discard_all(self, filterfunc=None):
if filterfunc is not None:
raise NotImplementedError(
'discard_all does not implement filters')
return self.purge()
def iterconsume(self, limit=None, no_ack=None):
return _iterconsume(self.connection, self, no_ack, limit)
def wait(self, limit=None):
it = self.iterconsume(limit)
return list(it)
def iterqueue(self, limit=None, infinite=False):
for items_since_start in count(): # for infinity
item = self.fetch()
if (not infinite and item is None) or \
(limit and items_since_start >= limit):
break
yield item
class ConsumerSet(messaging.Consumer):
def __init__(self, connection, from_dict=None, consumers=None,
channel=None, **kwargs):
if channel:
self._provided_channel = True
self.backend = channel
else:
self._provided_channel = False
self.backend = connection.channel()
queues = []
if consumers:
for consumer in consumers:
queues.extend(consumer.queues)
if from_dict:
for queue_name, queue_options in items(from_dict):
queues.append(Queue.from_dict(queue_name, **queue_options))
super(ConsumerSet, self).__init__(self.backend, queues, **kwargs)
def iterconsume(self, limit=None, no_ack=False):
return _iterconsume(self.connection, self, no_ack, limit)
def discard_all(self):
return self.purge()
def add_consumer_from_dict(self, queue, **options):
return self.add_queue(Queue.from_dict(queue, **options))
def add_consumer(self, consumer):
for queue in consumer.queues:
self.add_queue(queue)
def revive(self, channel):
self.backend = channel
super(ConsumerSet, self).revive(channel)
def close(self):
self.cancel()
if not self._provided_channel:
self.channel.close()
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