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# use correlation_id to deal with concurrent RPC calls. See:
# http://www.rabbitmq.com/tutorials/tutorial-six-python.html
msg_id = uuid.uuid4().hex
# expire the reply queue shortly after the timeout. it will be
# (lazily) deleted by the broker if we don't clean it up first
queue_arguments = {'x-expires': int((timeout + 1) * 1000)}
queue = Queue(name=msg_id, exchange=self._exchange, routing_key=msg_id,
durable=False, queue_arguments=queue_arguments)
messages = []
event = threading.Event()
def _callback(body, message):
messages.append(body)
message.ack()
event.set()
d = dict(op=operation, args=args)
headers = {'reply-to': msg_id, 'sender': self.add_sysname(self.name)}
dest = self.add_sysname(name)
def _declare_and_send(channel):
consumer = Consumer(channel, (queue,), callbacks=(_callback,))
with Producer(channel) as producer:
producer.publish(d, routing_key=dest, headers=headers,
exchange=self._exchange, serializer=self._serializer)
return consumer
log.debug(""sending call to %s:%s"", dest, operation)
with connections[self._pool_conn].acquire(block=True) as conn:
consumer, channel = self.ensure(conn, _declare_and_send)
try:
self._consume(conn, consumer, timeout=timeout, until_event=event)
# try to delete queue, but don't worry if it fails (will expire)
try:
queue = queue.bind(channel)
queue.delete(nowait=True)
except Exception:
log.exception(""error deleting queue"")
finally:
conn.maybe_close_channel(channel)
msg_body = messages[0]
if msg_body.get('error'):
raise_error(msg_body['error'])
else:
return msg_body.get('result')"
562,"def handle(self, operation, operation_name=None, sender_kwarg=None):
""""""Handle an operation using the specified function
@param operation: function to call for this operation
@param operation_name: operation name. if unspecified operation.__name__ is used
@param sender_kwarg: optional keyword arg on operation to feed in sender name
""""""
if not self._consumer:
self._consumer = DashiConsumer(self, self._conn,
self._name, self._exchange, sysname=self._sysname)
self._consumer.add_op(operation_name or operation.__name__, operation,
sender_kwarg=sender_kwarg)"
563,"def cancel(self, block=True):
""""""Cancel a call to consume() happening in another thread
This could take up to DashiConnection.consumer_timeout to complete.
@param block: if True, waits until the consumer has returned
""""""
if self._consumer:
self._consumer.cancel(block=block)"
564,"def link_exceptions(self, custom_exception=None, dashi_exception=None):
""""""Link a custom exception thrown on the receiver to a dashi exception
""""""
if custom_exception is None:
raise ValueError(""custom_exception must be set"")
if dashi_exception is None:
raise ValueError(""dashi_exception must be set"")
self._linked_exceptions[custom_exception] = dashi_exception"
565,"def ensure(self, connection, func, *args, **kwargs):
""""""Perform an operation until success
Repeats in the face of connection errors, pursuant to retry policy.
""""""
channel = None
while 1:
try:
if channel is None:
channel = connection.channel()
return func(channel, *args, **kwargs), channel
except (connection.connection_errors, IOError):
self._call_errback()
channel = self.connect(connection)"
566,"def re_tab(s):
""""""Return a tabbed string from an expanded one.""""""
l = []
p = 0
for i in range(8, len(s), 8):