/usr/share/pyshared/kombu/pidbox.py is in python-kombu 1.4.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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kombu.pidbox
===============
Generic process mailbox.
:copyright: (c) 2009 - 2011 by Ask Solem.
:license: BSD, see LICENSE for more details.
"""
import socket
from copy import copy
from itertools import count
from kombu.entity import Exchange, Queue
from kombu.messaging import Consumer, Producer
from kombu.utils import kwdict, uuid
class Node(object):
#: hostname of the node.
hostname = None
#: the :class:`Mailbox` this is a node for.
mailbox = None
#: map of method name/handlers.
handlers = None
#: current context (passed on to handlers)
state = None
#: current channel.
channel = None
def __init__(self, hostname, state=None, channel=None, handlers=None,
mailbox=None):
self.channel = channel
self.mailbox = mailbox
self.hostname = hostname
self.state = state
if handlers is None:
handlers = {}
self.handlers = handlers
def Consumer(self, channel=None, **options):
options.setdefault("no_ack", True)
return Consumer(channel or self.channel,
[self.mailbox.get_queue(self.hostname)],
**options)
def handler(self, fun):
self.handlers[fun.__name__] = fun
return fun
def listen(self, channel=None, callback=None):
callback = callback or self.handle_message
consumer = self.Consumer(channel=channel,
callbacks=[callback or self.handle_message])
consumer.consume()
return consumer
def dispatch_from_message(self, message):
message = dict(message)
method = message["method"]
destination = message.get("destination")
reply_to = message.get("reply_to")
arguments = message.get("arguments")
if not destination or self.hostname in destination:
return self.dispatch(method, arguments, reply_to)
def dispatch(self, method, arguments=None, reply_to=None):
arguments = arguments or {}
handle = reply_to and self.handle_call or self.handle_cast
try:
reply = handle(method, kwdict(arguments))
except SystemExit:
raise
except Exception, exc:
reply = {"error": repr(exc)}
if reply_to:
self.reply({self.hostname: reply},
exchange=reply_to["exchange"],
routing_key=reply_to["routing_key"])
return reply
def handle(self, method, arguments={}):
return self.handlers[method](self.state, **arguments)
def handle_call(self, method, arguments):
return self.handle(method, arguments)
def handle_cast(self, method, arguments):
return self.handle(method, arguments)
def handle_message(self, body, message):
return self.dispatch_from_message(body)
def reply(self, data, exchange, routing_key, **kwargs):
self.mailbox._publish_reply(data, exchange, routing_key,
channel=self.channel)
class Mailbox(object):
node_cls = Node
exchange_fmt = "%s.pidbox"
reply_exchange_fmt = "reply.%s.pidbox"
#: Name of application.
namespace = None
#: Connection (if bound).
connection = None
#: Exchange type (usually direct, or fanout for broadcast).
type = "direct"
#: mailbox exchange (init by constructor).
exchange = None
#: exchange to send replies to.
reply_exchange = None
def __init__(self, namespace, type="direct", connection=None):
self.namespace = namespace
self.connection = connection
self.type = type
self.exchange = self._get_exchange(self.namespace, self.type)
self.reply_exchange = self._get_reply_exchange(self.namespace)
def __call__(self, connection):
bound = copy(self)
bound.connection = connection
return bound
def Node(self, hostname=None, state=None, channel=None, handlers=None):
hostname = hostname or socket.gethostname()
return self.node_cls(hostname, state, channel, handlers, mailbox=self)
def call(self, destination, command, kwargs={}, timeout=None,
callback=None, channel=None):
return self._broadcast(command, kwargs, destination,
reply=True, timeout=timeout,
callback=callback,
channel=channel)
def cast(self, destination, command, kwargs={}):
return self._broadcast(command, kwargs, destination, reply=False)
def abcast(self, command, kwargs={}):
return self._broadcast(command, kwargs, reply=False)
def multi_call(self, command, kwargs={}, timeout=1,
limit=None, callback=None, channel=None):
return self._broadcast(command, kwargs, reply=True,
timeout=timeout, limit=limit,
callback=callback,
channel=channel)
def get_reply_queue(self, ticket):
return Queue("%s.%s" % (ticket, self.reply_exchange.name),
exchange=self.reply_exchange,
routing_key=ticket,
durable=False,
auto_delete=True)
def get_queue(self, hostname):
return Queue("%s.%s.pidbox" % (hostname, self.namespace),
exchange=self.exchange,
durable=False,
auto_delete=True)
def _publish_reply(self, reply, exchange, routing_key, channel=None):
chan = channel or self.connection.channel()
try:
exchange = Exchange(exchange, exchange_type="direct",
delivery_mode="transient",
durable=False,
auto_delete=True)
producer = Producer(chan, exchange=exchange,
auto_declare=True)
producer.publish(reply, routing_key=routing_key)
finally:
channel or chan.close()
def _publish(self, type, arguments, destination=None, reply_ticket=None,
channel=None):
message = {"method": type,
"arguments": arguments,
"destination": destination}
if reply_ticket:
message["reply_to"] = {"exchange": self.reply_exchange.name,
"routing_key": reply_ticket}
chan = channel or self.connection.channel()
producer = Producer(chan, exchange=self.exchange)
try:
producer.publish(message)
finally:
channel or chan.close()
def _broadcast(self, command, arguments=None, destination=None,
reply=False, timeout=1, limit=None, callback=None, channel=None):
arguments = arguments or {}
reply_ticket = reply and uuid() or None
if destination is not None and \
not isinstance(destination, (list, tuple)):
raise ValueError("destination must be a list/tuple not %s" % (
type(destination)))
# Set reply limit to number of destinations (if specificed)
if limit is None and destination:
limit = destination and len(destination) or None
chan = channel or self.connection.channel()
try:
if reply_ticket:
self.get_reply_queue(reply_ticket)(chan).declare()
self._publish(command, arguments, destination=destination,
reply_ticket=reply_ticket,
channel=chan)
if reply_ticket:
return self._collect(reply_ticket, limit=limit,
timeout=timeout,
callback=callback,
channel=chan)
finally:
channel or chan.close()
def _collect(self, ticket, limit=None, timeout=1,
callback=None, channel=None):
chan = channel or self.connection.channel()
queue = self.get_reply_queue(ticket)
consumer = Consumer(channel, [queue], no_ack=True)
responses = []
def on_message(body, message):
if callback:
callback(body)
responses.append(body)
try:
consumer.register_callback(on_message)
consumer.consume()
for i in limit and range(limit) or count():
try:
self.connection.drain_events(timeout=timeout)
except socket.timeout:
break
chan.after_reply_message_received(queue.name)
return responses
finally:
channel or chan.close()
def _get_exchange(self, namespace, type):
return Exchange(self.exchange_fmt % namespace,
type=type,
durable=False,
auto_delete=True,
delivery_mode="transient")
def _get_reply_exchange(self, namespace):
return Exchange(self.reply_exchange_fmt % namespace,
type="direct",
durable=False,
auto_delete=True,
delivery_mode="transient")
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