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"""
kombu.transport.pika
====================
Pika transport.
:copyright: (c) 2009 - 2012 by Ask Solem.
:license: BSD, see LICENSE for more details.
"""
from __future__ import absolute_import
import socket
from operator import attrgetter
from kombu.exceptions import StdConnectionError, StdChannelError
from kombu.utils.amq_manager import get_manager
from . import base
import pika
from pika import spec
from pika.adapters import blocking_connection as blocking
from pika import exceptions
DEFAULT_PORT = 5672
BASIC_PROPERTIES = ('content_type', 'content_encoding',
'headers', 'delivery_mode', 'priority',
'correlation_id', 'reply_to', 'expiration',
'message_id', 'timestamp', 'type', 'user_id',
'app_id', 'cluster_id')
class Message(base.Message):
def __init__(self, channel, amqp_message, **kwargs):
channel_id, method, props, body = amqp_message
propdict = dict(zip(BASIC_PROPERTIES,
attrgetter(*BASIC_PROPERTIES)(props)))
kwargs.update({'body': body,
'delivery_tag': method.delivery_tag,
'content_type': props.content_type,
'content_encoding': props.content_encoding,
'headers': props.headers,
'properties': propdict,
'delivery_info': dict(
consumer_tag=getattr(method, 'consumer_tag', None),
routing_key=method.routing_key,
delivery_tag=method.delivery_tag,
redelivered=method.redelivered,
exchange=method.exchange)})
super(Message, self).__init__(channel, **kwargs)
class Channel(blocking.BlockingChannel, base.StdChannel):
Message = Message
def basic_get(self, queue, no_ack):
method = super(Channel, self).basic_get(self, queue=queue,
no_ack=no_ack)
# pika returns semi-predicates (GetEmpty/GetOk).
if isinstance(method, spec.Basic.GetEmpty):
return
return None, method, method._properties, method._body
def queue_purge(self, queue=None, nowait=False):
return super(Channel, self).\
queue_purge(queue=queue, nowait=nowait).method.message_count
def basic_publish(self, message, exchange, routing_key, mandatory=False,
immediate=False):
body, properties = message
try:
return super(Channel, self).basic_publish(exchange,
routing_key,
body,
properties,
mandatory,
immediate)
finally:
# Pika does not automatically flush the outbound buffer
# TODO async: Needs to support `nowait`.
self.connection._flush_outbound()
def basic_consume(self, queue, no_ack=False, consumer_tag=None,
callback=None, nowait=False):
# Kombu callbacks only take a single `message` argument,
# but pika applies with 4 arguments, so need to wrap
# these into a single tuple.
def _callback_decode(channel, method, header, body):
return callback((channel, method, header, body))
return super(Channel, self).basic_consume(
_callback_decode, queue, no_ack, False, consumer_tag)
def prepare_message(self, body, priority=None,
content_type=None, content_encoding=None, headers=None,
properties=None):
properties = spec.BasicProperties(priority=priority,
content_type=content_type,
content_encoding=content_encoding,
headers=headers)
return body, properties
def message_to_python(self, raw_message):
return self.Message(channel=self, amqp_message=raw_message)
def basic_qos(self, prefetch_size, prefetch_count, a_global=False):
return super(Channel, self).basic_qos(prefetch_size=prefetch_size,
prefetch_count=prefetch_count,
global_=a_global)
def __enter__(self):
return self
def __exit__(self, *exc_info):
self.close()
def close(self, *args):
super(Channel, self).close(*args)
self.connection = None
if getattr(self, 'handler', None):
if getattr(self.handler, 'connection', None):
self.handler.connection.channels.pop(
self.handler.channel_number, None)
self.handler.connection = None
self.handler = None
@property
def channel_id(self):
return self.channel_number
class Connection(blocking.BlockingConnection):
Channel = Channel
def __init__(self, client, *args, **kwargs):
self.client = client
super(Connection, self).__init__(*args, **kwargs)
def channel(self):
self._channel_open = False
cid = self._next_channel_number()
self.callbacks.add(cid, spec.Channel.CloseOk, self._on_channel_close)
transport = blocking.BlockingChannelTransport(self, cid)
channel = self._channels[cid] = self.Channel(self, cid, transport)
channel.connection = self
return channel
def drain_events(self, timeout=None):
if timeout:
prev = self.socket.gettimeout()
self.socket.settimeout(timeout)
try:
self._handle_read()
finally:
if timeout:
self.socket.settimeout(prev)
self._flush_outbound()
def close(self, *args):
self.client = None
super(Connection, self).close(*args)
AuthenticationError = getattr(exceptions, 'AuthenticationError',
getattr(exceptions, 'LoginError'))
class Transport(base.Transport):
Message = Message
Connection = Connection
default_port = DEFAULT_PORT
connection_errors = (StdConnectionError,
socket.error,
exceptions.ConnectionClosed,
exceptions.ChannelClosed,
AuthenticationError,
exceptions.NoFreeChannels,
exceptions.DuplicateConsumerTag,
exceptions.UnknownConsumerTag,
exceptions.RecursiveOperationDetected,
exceptions.ProtocolSyntaxError)
channel_errors = (StdChannelError,
exceptions.ChannelClosed,
exceptions.DuplicateConsumerTag,
exceptions.UnknownConsumerTag,
exceptions.ProtocolSyntaxError)
driver_type = 'amqp'
driver_name = 'pika'
def __init__(self, client, **kwargs):
self.client = client
self.default_port = kwargs.get('default_port', self.default_port)
def driver_version(self):
return pika.__version__
def create_channel(self, connection):
return connection.channel()
def drain_events(self, connection, **kwargs):
return connection.drain_events(**kwargs)
def establish_connection(self):
"""Establish connection to the AMQP broker."""
conninfo = self.client
for name, default_value in self.default_connection_params.items():
if not getattr(conninfo, name, None):
setattr(conninfo, name, default_value)
credentials = pika.PlainCredentials(conninfo.userid,
conninfo.password)
return self.Connection(self.client,
pika.ConnectionParameters(
conninfo.hostname, port=conninfo.port,
virtual_host=conninfo.virtual_host,
credentials=credentials))
def close_connection(self, connection):
"""Close the AMQP broker connection."""
connection.close()
def get_manager(self, *args, **kwargs):
return get_manager(self.client, *args, **kwargs)
@property
def default_connection_params(self):
return {'hostname': 'localhost', 'port': self.default_port,
'userid': 'guest', 'password': 'guest'}
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