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"""
kombu.transport.pypika
======================
Pika transport.
:copyright: (c) 2009 - 2011 by Ask Solem.
:license: BSD, see LICENSE for more details.
"""
import socket
from operator import attrgetter
from kombu.exceptions import VersionMismatch
from kombu.transport import base
from pika import channel # must be here to raise importerror for below.
try:
from pika import asyncore_adapter
except ImportError:
raise VersionMismatch("Kombu only works with pika version 0.5.2")
from pika import blocking_adapter
from pika import connection
from pika import exceptions
from pika.spec import Basic, BasicProperties
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(channel.Channel, base.StdChannel):
Message = Message
def basic_get(self, queue, no_ack):
method = channel.Channel.basic_get(self, queue=queue, no_ack=no_ack)
# pika returns semi-predicates (GetEmpty/GetOk).
if isinstance(method, Basic.GetEmpty):
return
return None, method, method._properties, method._body
def queue_purge(self, queue=None, nowait=False):
return channel.Channel.queue_purge(self, queue=queue, nowait=nowait) \
.message_count
def basic_publish(self, message, exchange, routing_key, mandatory=False,
immediate=False):
message_data, properties = message
try:
return channel.Channel.basic_publish(self,
exchange,
routing_key,
message_data,
properties,
mandatory,
immediate)
finally:
# Pika does not automatically flush the outbound buffer
# TODO async: Needs to support `nowait`.
self.handler.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 channel.Channel.basic_consume(self, _callback_decode,
queue, no_ack,
False, consumer_tag)
def prepare_message(self, message_data, priority=None,
content_type=None, content_encoding=None, headers=None,
properties=None):
properties = BasicProperties(priority=priority,
content_type=content_type,
content_encoding=content_encoding,
headers=headers,
**properties)
return message_data, properties
def message_to_python(self, raw_message):
return self.Message(channel=self, amqp_message=raw_message)
def basic_ack(self, delivery_tag):
return channel.Channel.basic_ack(self, delivery_tag)
def __enter__(self):
return self
def __exit__(self, *exc_info):
self.close()
def close(self):
super(Channel, self).close()
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 BlockingConnection(blocking_adapter.BlockingConnection):
Super = blocking_adapter.BlockingConnection
def __init__(self, client, *args, **kwargs):
self.client = client
self.Super.__init__(self, *args, **kwargs)
def channel(self):
c = Channel(channel.ChannelHandler(self))
c.connection = self
return c
def close(self):
self.client = None
self.Super.close(self)
def ensure_drain_events(self, timeout=None):
return self.drain_events(timeout=timeout)
class AsyncoreConnection(asyncore_adapter.AsyncoreConnection):
_event_counter = 0
Super = asyncore_adapter.AsyncoreConnection
def __init__(self, client, *args, **kwargs):
self.client = client
self.Super.__init__(self, *args, **kwargs)
def channel(self):
c = Channel(channel.ChannelHandler(self))
c.connection = self
return c
def ensure_drain_events(self, timeout=None):
# asyncore connection does not raise socket.timeout when timing out
# so need to do a little trick here to mimic the behavior
# of sync connection.
current_events = self._event_counter
self.drain_events(timeout=timeout)
if timeout and self._event_counter <= current_events:
raise socket.timeout("timed out")
def on_data_available(self, buf):
self._event_counter += 1
self.Super.on_data_available(self, buf)
def close(self):
self.client = None
self.Super.close(self)
class SyncTransport(base.Transport):
default_port = DEFAULT_PORT
connection_errors = (socket.error,
exceptions.ConnectionClosed,
exceptions.ChannelClosed,
exceptions.LoginError,
exceptions.NoFreeChannels,
exceptions.DuplicateConsumerTag,
exceptions.UnknownConsumerTag,
exceptions.RecursiveOperationDetected,
exceptions.ContentTransmissionForbidden,
exceptions.ProtocolSyntaxError)
channel_errors = (exceptions.ChannelClosed,
exceptions.DuplicateConsumerTag,
exceptions.UnknownConsumerTag,
exceptions.ProtocolSyntaxError)
Message = Message
Connection = BlockingConnection
def __init__(self, client, **kwargs):
self.client = client
self.default_port = kwargs.get("default_port", self.default_port)
def create_channel(self, connection):
return connection.channel()
def drain_events(self, connection, **kwargs):
return connection.ensure_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 = connection.PlainCredentials(conninfo.userid,
conninfo.password)
return self.Connection(self.client,
connection.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()
@property
def default_connection_params(self):
return {"hostname": "localhost", "port": self.default_port,
"userid": "guest", "password": "guest"}
class AsyncoreTransport(SyncTransport):
Connection = AsyncoreConnection
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