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"""
kombu.simple
============
Simple interface.
:copyright: (c) 2009 - 2012 by Ask Solem.
:license: BSD, see LICENSE for more details.
"""
from __future__ import absolute_import
import socket
from collections import deque
from time import time
from Queue import Empty
from . import entity
from . import messaging
from .connection import maybe_channel
__all__ = ["SimpleQueue", "SimpleBuffer"]
class SimpleBase(object):
_consuming = False
def __enter__(self):
return self
def __exit__(self, *exc_info):
self.close()
def __init__(self, channel, producer, consumer, no_ack=False):
self.channel = maybe_channel(channel)
self.producer = producer
self.consumer = consumer
self.no_ack = no_ack
self.queue = self.consumer.queues[0]
self.buffer = deque()
self.consumer.register_callback(self._receive)
def get(self, block=True, timeout=None):
if not block:
return self.get_nowait()
self._consume()
elapsed = 0.0
remaining = timeout
while True:
time_start = time()
if self.buffer:
return self.buffer.pop()
try:
self.channel.connection.client.drain_events(
timeout=timeout and remaining)
except socket.timeout:
raise Empty()
elapsed += time() - time_start
remaining = timeout and timeout - elapsed or None
def get_nowait(self):
m = self.queue.get(no_ack=self.no_ack)
if not m:
raise Empty()
return m
def put(self, message, serializer=None, headers=None, compression=None,
routing_key=None, **kwargs):
self.producer.publish(message,
serializer=serializer,
routing_key=routing_key,
headers=headers,
compression=compression,
**kwargs)
def clear(self):
return self.consumer.purge()
def qsize(self):
_, size, _ = self.queue.queue_declare(passive=True)
return size
def close(self):
self.consumer.cancel()
def _receive(self, message_data, message):
self.buffer.append(message)
def _consume(self):
if not self._consuming:
self.consumer.consume(no_ack=self.no_ack)
self._consuming = True
def __len__(self):
"""`len(self) -> self.qsize()`"""
return self.qsize()
def __nonzero__(self):
return True
class SimpleQueue(SimpleBase):
no_ack = False
queue_opts = {}
exchange_opts = {}
def __init__(self, channel, name, no_ack=None, queue_opts=None,
exchange_opts=None, serializer=None, compression=None, **kwargs):
queue = name
queue_opts = dict(self.queue_opts, **queue_opts or {})
exchange_opts = dict(self.exchange_opts, **exchange_opts or {})
if no_ack is None:
no_ack = self.no_ack
if not isinstance(queue, entity.Queue):
exchange = entity.Exchange(name, "direct", **exchange_opts)
queue = entity.Queue(name, exchange, name, **queue_opts)
else:
name = queue.name
exchange = queue.exchange
producer = messaging.Producer(channel, exchange,
serializer=serializer,
routing_key=name,
compression=compression)
consumer = messaging.Consumer(channel, queue)
super(SimpleQueue, self).__init__(channel, producer,
consumer, no_ack, **kwargs)
class SimpleBuffer(SimpleQueue):
no_ack = True
queue_opts = dict(durable=False,
auto_delete=True)
exchange_opts = dict(durable=False,
delivery_mode="transient",
auto_delete=True)
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