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import uuid
import warnings
from typing import Any, Awaitable, Callable, Dict, Optional, Tuple, Union
import aiormq
from aiormq import ChannelInvalidStateError
from pamqp.common import Arguments
from .abc import (
AbstractChannel, AbstractExchange, AbstractIncomingMessage,
AbstractQueueIterator, AbstractRobustQueue, ConsumerTag, TimeoutType,
)
from .exchange import ExchangeParamType
from .log import get_logger
from .queue import Queue, QueueIterator
log = get_logger(__name__)
class RobustQueue(Queue, AbstractRobustQueue):
__slots__ = ("_consumers", "_bindings")
_consumers: Dict[ConsumerTag, Dict[str, Any]]
_bindings: Dict[Tuple[Union[AbstractExchange, str], str], Dict[str, Any]]
def __init__(
self,
channel: AbstractChannel,
name: Optional[str],
durable: bool = False,
exclusive: bool = False,
auto_delete: bool = False,
arguments: Arguments = None,
passive: bool = False,
):
super().__init__(
channel=channel,
name=name or f"amq_{uuid.uuid4().hex}",
durable=durable,
exclusive=exclusive,
auto_delete=auto_delete,
arguments=arguments,
passive=passive,
)
self._consumers = {}
self._bindings = {}
async def restore(self, channel: Any = None) -> None:
if channel is not None:
warnings.warn(
"Channel argument will be ignored because you "
"don't need to pass this anymore.",
DeprecationWarning,
)
await self.declare()
bindings = tuple(self._bindings.items())
consumers = tuple(self._consumers.items())
for (exchange, routing_key), kwargs in bindings:
await self.bind(exchange, routing_key, **kwargs)
for consumer_tag, kwargs in consumers:
await self.consume(consumer_tag=consumer_tag, **kwargs)
async def bind(
self,
exchange: ExchangeParamType,
routing_key: Optional[str] = None,
*,
arguments: Arguments = None,
timeout: TimeoutType = None,
robust: bool = True,
) -> aiormq.spec.Queue.BindOk:
if routing_key is None:
routing_key = self.name
result = await super().bind(
exchange=exchange, routing_key=routing_key,
arguments=arguments, timeout=timeout,
)
if robust:
self._bindings[(exchange, routing_key)] = dict(
arguments=arguments,
)
return result
async def unbind(
self,
exchange: ExchangeParamType,
routing_key: Optional[str] = None,
arguments: Arguments = None,
timeout: TimeoutType = None,
) -> aiormq.spec.Queue.UnbindOk:
if routing_key is None:
routing_key = self.name
result = await super().unbind(
exchange, routing_key, arguments, timeout,
)
self._bindings.pop((exchange, routing_key), None)
return result
async def consume(
self,
callback: Callable[[AbstractIncomingMessage], Awaitable[Any]],
no_ack: bool = False,
exclusive: bool = False,
arguments: Arguments = None,
consumer_tag: Optional[ConsumerTag] = None,
timeout: TimeoutType = None,
robust: bool = True,
) -> ConsumerTag:
consumer_tag = await super().consume(
consumer_tag=consumer_tag,
timeout=timeout,
callback=callback,
no_ack=no_ack,
exclusive=exclusive,
arguments=arguments,
)
if robust:
self._consumers[consumer_tag] = dict(
callback=callback,
no_ack=no_ack,
exclusive=exclusive,
arguments=arguments,
)
return consumer_tag
async def cancel(
self,
consumer_tag: ConsumerTag,
timeout: TimeoutType = None,
nowait: bool = False,
) -> aiormq.spec.Basic.CancelOk:
result = await super().cancel(consumer_tag, timeout, nowait)
self._consumers.pop(consumer_tag, None)
return result
def iterator(self, **kwargs: Any) -> AbstractQueueIterator:
return RobustQueueIterator(self, **kwargs)
class RobustQueueIterator(QueueIterator):
def __init__(self, queue: Queue, **kwargs: Any):
super().__init__(queue, **kwargs)
self._amqp_queue.close_callbacks.discard(self._set_closed)
async def consume(self) -> None:
while True:
try:
return await super().consume()
except ChannelInvalidStateError:
await self._amqp_queue.channel.get_underlay_channel()
__all__ = ("RobustQueue",)
|
