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87 lines
2.6 KiB
Python
87 lines
2.6 KiB
Python
2 years ago
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from typing import Callable, Generic, Optional, TypeVar
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from amqpstorm import Channel
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from amqpworker.easyqueue.connection import AMQPConnection
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from amqpworker.easyqueue.exceptions import UndecodableMessageException
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T = TypeVar("T")
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class AMQPMessage(Generic[T]):
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__slots__ = (
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"connection",
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"channel",
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"queue_name",
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"serialized_data",
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"delivery_tag",
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"_envelope",
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"_properties",
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"_deserialization_method",
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"_deserialized_data",
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"_queue",
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)
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def __init__(
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self,
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connection: AMQPConnection,
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channel: Channel,
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queue_name: str,
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serialized_data: bytes,
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delivery_tag: int,
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properties: dict,
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deserialization_method: Callable[[bytes], T],
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queue,
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) -> None:
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self.queue_name = queue_name
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self.serialized_data = serialized_data
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self.delivery_tag = delivery_tag
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self.connection = connection
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self.channel = channel
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self._properties = properties
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self._deserialization_method = deserialization_method
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self._deserialized_data: Optional[T] = None
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self._queue = queue
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@property
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def deserialized_data(self) -> T:
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if self._deserialized_data:
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return self._deserialized_data
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try:
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self._deserialized_data = self._deserialization_method(
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self.serialized_data
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)
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except ValueError as e:
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raise UndecodableMessageException(
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"msg couldn't be decoded as JSON"
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) from e
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return self._deserialized_data
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def __eq__(self, other):
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if not isinstance(other, self.__class__):
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return False
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for attr in self.__slots__:
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if attr.startswith("__"):
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continue
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if getattr(self, attr) != getattr(other, attr):
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return False
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return True
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def ack(self):
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return self.channel.basic.ack(self.delivery_tag)
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def reject(self, requeue=False):
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return self.channel.basic.reject(
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delivery_tag=self.delivery_tag, requeue=requeue
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)
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def requeue(self):
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self.channel.basic.ack(self.delivery_tag)
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self.channel.basic.publish(body=self.serialized_data,
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routing_key=self.queue_name,
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properties=self._properties,
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mandatory=False,
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immediate=False)
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