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"""
kombu.transport.pyamqp
======================
pure python amqp transport.
"""
from __future__ import absolute_import
import amqp
from kombu.exceptions import (
StdConnectionError,
StdChannelError,
VersionMismatch,
)
from kombu.utils.amq_manager import get_manager
from . import base
DEFAULT_PORT = 5672
if amqp.VERSION < (0, 9, 3): # pragma: no cover
raise VersionMismatch('Please install amqp version 0.9.3 or higher.')
class Message(base.Message):
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') or {},
**kwargs)
class Channel(amqp.Channel, base.StdChannel):
Message = Message
def prepare_message(self, body, priority=None,
content_type=None, content_encoding=None, headers=None,
properties=None):
"""Encapsulate data into a AMQP message."""
return amqp.Message(body, 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)
class Connection(amqp.Connection):
Channel = Channel
class Transport(base.Transport):
Connection = Connection
default_port = DEFAULT_PORT
# it's very annoying that pyamqp sometimes raises AttributeError
# if the connection is lost, but nothing we can do about that here.
connection_errors = (StdConnectionError, ) + \
amqp.Connection.connection_errors
channel_errors = (StdChannelError, ) + amqp.Connection.channel_errors
nb_keep_draining = True
driver_name = "py-amqp"
driver_type = "amqp"
supports_heartbeats = True
supports_ev = True
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,
heartbeat=conninfo.heartbeat)
conn.client = self.client
return conn
def close_connection(self, connection):
"""Close the AMQP broker connection."""
connection.client = None
connection.close()
def is_alive(self, connection):
return connection.is_alive()
def verify_connection(self, connection):
return connection.channels is not None and self.is_alive(connection)
def eventmap(self, connection):
return {connection.sock: self.client.drain_nowait}
def on_poll_init(self, poller):
pass
def on_poll_start(self):
return {}
def heartbeat_check(self, connection, rate=2):
return connection.heartbeat_tick(rate=rate)
@property
def default_connection_params(self):
return {'userid': 'guest', 'password': 'guest',
'port': self.default_port,
'hostname': 'localhost', 'login_method': 'AMQPLAIN'}
def get_manager(self, *args, **kwargs):
return get_manager(self.client, *args, **kwargs)
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