/usr/lib/python3/dist-packages/kombu/simple.py is in python3-kombu 4.1.0-1.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 | """Simple messaging interface."""
from __future__ import absolute_import, unicode_literals
import socket
from collections import deque
from . import entity
from . import messaging
from .connection import maybe_channel
from .five import Empty, monotonic
__all__ = ['SimpleQueue', 'SimpleBuffer']
class SimpleBase(object):
Empty = Empty
_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()
time_start = monotonic()
remaining = timeout
while True:
if self.buffer:
return self.buffer.popleft()
if remaining is not None and remaining <= 0.0:
raise self.Empty()
try:
# The `drain_events` method will
# block on the socket connection to rabbitmq. if any
# application-level messages are received, it will put them
# into `self.buffer`.
# * The method will block for UP TO `timeout` milliseconds.
# * The method may raise a socket.timeout exception; or...
# * The method may return without having put anything on
# `self.buffer`. This is because internal heartbeat
# messages are sent over the same socket; also POSIX makes
# no guarantees against socket calls returning early.
self.channel.connection.client.drain_events(timeout=remaining)
except socket.timeout:
raise self.Empty()
if remaining is not None:
elapsed = monotonic() - time_start
remaining = timeout - elapsed
def get_nowait(self):
m = self.queue.get(no_ack=self.no_ack)
if not m:
raise self.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 __bool__(self):
return True
__nonzero__ = __bool__
class SimpleQueue(SimpleBase):
"""Simple API for persistent queues."""
no_ack = False
queue_opts = {}
exchange_opts = {'type': 'direct'}
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, **exchange_opts)
queue = entity.Queue(name, exchange, name, **queue_opts)
routing_key = name
else:
name = queue.name
exchange = queue.exchange
routing_key = queue.routing_key
consumer = messaging.Consumer(channel, queue)
producer = messaging.Producer(channel, exchange,
serializer=serializer,
routing_key=routing_key,
compression=compression)
super(SimpleQueue, self).__init__(channel, producer,
consumer, no_ack, **kwargs)
class SimpleBuffer(SimpleQueue):
"""Simple API for ephemeral queues."""
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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