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"""Object utilities."""
from copy import copy
from .connection import maybe_channel
from .exceptions import NotBoundError
from .utils.functional import ChannelPromise
__all__ = ('Object', 'MaybeChannelBound')
def unpickle_dict(cls, kwargs):
return cls(**kwargs)
def _any(v):
return v
class Object:
"""Common base class.
Supports automatic kwargs->attributes handling, and cloning.
"""
attrs = ()
def __init__(self, *args, **kwargs):
for name, type_ in self.attrs:
value = kwargs.get(name)
if value is not None:
setattr(self, name, (type_ or _any)(value))
else:
try:
getattr(self, name)
except AttributeError:
setattr(self, name, None)
def as_dict(self, recurse=False):
def f(obj, type):
if recurse and isinstance(obj, Object):
return obj.as_dict(recurse=True)
return type(obj) if type and obj is not None else obj
return {
attr: f(getattr(self, attr), type) for attr, type in self.attrs
}
def __reduce__(self):
return unpickle_dict, (self.__class__, self.as_dict())
def __copy__(self):
return self.__class__(**self.as_dict())
class MaybeChannelBound(Object):
"""Mixin for classes that can be bound to an AMQP channel."""
_channel = None
_is_bound = False
#: Defines whether maybe_declare can skip declaring this entity twice.
can_cache_declaration = False
def __call__(self, channel):
"""`self(channel) -> self.bind(channel)`."""
return self.bind(channel)
def bind(self, channel):
"""Create copy of the instance that is bound to a channel."""
return copy(self).maybe_bind(channel)
def maybe_bind(self, channel):
"""Bind instance to channel if not already bound."""
if not self.is_bound and channel:
self._channel = maybe_channel(channel)
self.when_bound()
self._is_bound = True
return self
def revive(self, channel):
"""Revive channel after the connection has been re-established.
Used by :meth:`~kombu.Connection.ensure`.
"""
if self.is_bound:
self._channel = channel
self.when_bound()
def when_bound(self):
"""Callback called when the class is bound."""
def __repr__(self):
return self._repr_entity(type(self).__name__)
def _repr_entity(self, item=''):
item = item or type(self).__name__
if self.is_bound:
return '<{} bound to chan:{}>'.format(
item or type(self).__name__, self.channel.channel_id)
return f'<unbound {item}>'
@property
def is_bound(self):
"""Flag set if the channel is bound."""
return self._is_bound and self._channel is not None
@property
def channel(self):
"""Current channel if the object is bound."""
channel = self._channel
if channel is None:
raise NotBoundError(
"Can't call method on {} not bound to a channel".format(
type(self).__name__))
if isinstance(channel, ChannelPromise):
channel = self._channel = channel()
return channel
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