/usr/share/pyshared/kombu/transport/pyamqplib.py is in python-kombu 1.4.3-1.
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kombu.transport.pyamqplib
=========================
amqplib transport.
:copyright: (c) 2009 - 2011 by Ask Solem.
:license: BSD, see LICENSE for more details.
"""
import socket
try:
from ssl import SSLError
except ImportError:
class SSLError(Exception): # noqa
pass
from amqplib import client_0_8 as amqp
from amqplib.client_0_8 import transport
from amqplib.client_0_8.channel import Channel as _Channel
from amqplib.client_0_8.exceptions import AMQPConnectionException
from amqplib.client_0_8.exceptions import AMQPChannelException
from kombu.transport import base
from kombu.utils.encoding import str_to_bytes
DEFAULT_PORT = 5672
# amqplib's handshake mistakenly identifies as protocol version 1191,
# this breaks in RabbitMQ tip, which no longer falls back to
# 0-8 for unknown ids.
transport.AMQP_PROTOCOL_HEADER = str_to_bytes("AMQP\x01\x01\x08\x00")
class Connection(amqp.Connection): # pragma: no cover
def _dispatch_basic_return(self, channel, args, msg):
reply_code = args.read_short()
reply_text = args.read_shortstr()
exchange = args.read_shortstr()
routing_key = args.read_shortstr()
exc = AMQPChannelException(reply_code, reply_text, (50, 60))
if channel.events["basic_return"]:
for callback in channel.events["basic_return"]:
callback(exc, exchange, routing_key, msg)
else:
raise exc
def __init__(self, *args, **kwargs):
super(Connection, self).__init__(*args, **kwargs)
self._method_override = {(60, 50): self._dispatch_basic_return}
def drain_events(self, allowed_methods=None, timeout=None):
"""Wait for an event on any channel."""
return self.wait_multi(self.channels.values(), timeout=timeout)
def wait_multi(self, channels, allowed_methods=None, timeout=None):
"""Wait for an event on a channel."""
chanmap = dict((chan.channel_id, chan) for chan in channels)
chanid, method_sig, args, content = self._wait_multiple(
chanmap.keys(), allowed_methods, timeout=timeout)
channel = chanmap[chanid]
if content \
and channel.auto_decode \
and hasattr(content, 'content_encoding'):
try:
content.body = content.body.decode(content.content_encoding)
except Exception:
pass
amqp_method = self._method_override.get(method_sig) or \
channel._METHOD_MAP.get(method_sig, None)
if amqp_method is None:
raise Exception('Unknown AMQP method (%d, %d)' % method_sig)
if content is None:
return amqp_method(channel, args)
else:
return amqp_method(channel, args, content)
def read_timeout(self, timeout=None):
if timeout is None:
return self.method_reader.read_method()
sock = self.transport.sock
prev = sock.gettimeout()
sock.settimeout(timeout)
try:
try:
return self.method_reader.read_method()
except SSLError, exc:
# http://bugs.python.org/issue10272
if "timed out" in str(exc):
raise socket.timeout()
raise
finally:
sock.settimeout(prev)
def _wait_multiple(self, channel_ids, allowed_methods, timeout=None):
for channel_id in channel_ids:
method_queue = self.channels[channel_id].method_queue
for queued_method in method_queue:
method_sig = queued_method[0]
if (allowed_methods is None) \
or (method_sig in allowed_methods) \
or (method_sig == (20, 40)):
method_queue.remove(queued_method)
method_sig, args, content = queued_method
return channel_id, method_sig, args, content
# Nothing queued, need to wait for a method from the peer
read_timeout = self.read_timeout
channels = self.channels
wait = self.wait
while 1:
channel, method_sig, args, content = read_timeout(timeout)
if (channel in channel_ids) \
and ((allowed_methods is None) \
or (method_sig in allowed_methods) \
or (method_sig == (20, 40))):
return channel, method_sig, args, content
# Not the channel and/or method we were looking for. Queue
# this method for later
channels[channel].method_queue.append((method_sig, args, content))
#
# If we just queued up a method for channel 0 (the Connection
# itself) it's probably a close method in reaction to some
# error, so deal with it right away.
#
if channel == 0:
wait()
def channel(self, channel_id=None):
try:
return self.channels[channel_id]
except KeyError:
return Channel(self, channel_id)
class Message(base.Message):
"""A message received by the broker.
.. attribute:: body
The message body.
.. attribute:: delivery_tag
The message delivery tag, uniquely identifying this message.
.. attribute:: channel
The channel instance the message was received on.
"""
def __init__(self, channel, msg, **kwargs):
props = msg.properties
super(Message, self).__init__(channel,
body=msg.body,
delivery_tag=msg.delivery_tag,
content_type=props.get("content_type"),
content_encoding=props.get("content_encoding"),
delivery_info=msg.delivery_info,
properties=msg.properties,
headers=props.get("application_headers"),
**kwargs)
class Channel(_Channel, base.StdChannel):
Message = Message
events = {"basic_return": []}
def __init__(self, *args, **kwargs):
self.no_ack_consumers = set()
super(Channel, self).__init__(*args, **kwargs)
def prepare_message(self, message_data, priority=None,
content_type=None, content_encoding=None, headers=None,
properties=None):
"""Encapsulate data into a AMQP message."""
return amqp.Message(message_data, priority=priority,
content_type=content_type,
content_encoding=content_encoding,
application_headers=headers,
**properties)
def message_to_python(self, raw_message):
"""Convert encoded message body back to a Python value."""
return self.Message(self, raw_message)
def close(self):
try:
super(Channel, self).close()
finally:
self.connection = None
def basic_consume(self, *args, **kwargs):
consumer_tag = super(Channel, self).basic_consume(*args, **kwargs)
if kwargs["no_ack"]:
self.no_ack_consumers.add(consumer_tag)
return consumer_tag
def basic_cancel(self, consumer_tag, **kwargs):
self.no_ack_consumers.discard(consumer_tag)
return super(Channel, self).basic_cancel(consumer_tag, **kwargs)
class Transport(base.Transport):
Connection = Connection
default_port = DEFAULT_PORT
# it's very annoying that amqplib sometimes raises AttributeError
# if the connection is lost, but nothing we can do about that here.
connection_errors = (AMQPConnectionException,
socket.error,
IOError,
OSError,
AttributeError)
channel_errors = (AMQPChannelException, )
def __init__(self, client, **kwargs):
self.client = client
self.default_port = kwargs.get("default_port") or self.default_port
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)
if conninfo.hostname == "localhost":
conninfo.hostname = "127.0.0.1"
conn = self.Connection(host=conninfo.host,
userid=conninfo.userid,
password=conninfo.password,
login_method=conninfo.login_method,
virtual_host=conninfo.virtual_host,
insist=conninfo.insist,
ssl=conninfo.ssl,
connect_timeout=conninfo.connect_timeout)
conn.client = self.client
return conn
def close_connection(self, connection):
"""Close the AMQP broker connection."""
connection.client = None
connection.close()
def verify_connection(self, connection):
return connection.channels is not None
@property
def default_connection_params(self):
return {"userid": "guest", "password": "guest",
"port": self.default_port,
"hostname": "localhost", "login_method": "AMQPLAIN"}
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