76 lines
2.4 KiB
Python
76 lines
2.4 KiB
Python
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""" Multicast DNS Service Discovery for Python, v0.14-wmcbrine
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Copyright 2003 Paul Scott-Murphy, 2014 William McBrine
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This module provides a framework for the use of DNS Service Discovery
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using IP multicast.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
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USA
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"""
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import enum
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from typing import TYPE_CHECKING, Any, Callable, List
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if TYPE_CHECKING:
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from .._core import Zeroconf
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@enum.unique
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class ServiceStateChange(enum.Enum):
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Added = 1
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Removed = 2
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Updated = 3
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class ServiceListener:
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def add_service(self, zc: 'Zeroconf', type_: str, name: str) -> None:
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raise NotImplementedError()
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def remove_service(self, zc: 'Zeroconf', type_: str, name: str) -> None:
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raise NotImplementedError()
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def update_service(self, zc: 'Zeroconf', type_: str, name: str) -> None:
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raise NotImplementedError()
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class Signal:
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__slots__ = ('_handlers',)
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def __init__(self) -> None:
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self._handlers: List[Callable[..., None]] = []
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def fire(self, **kwargs: Any) -> None:
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for h in self._handlers[:]:
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h(**kwargs)
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@property
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def registration_interface(self) -> 'SignalRegistrationInterface':
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return SignalRegistrationInterface(self._handlers)
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class SignalRegistrationInterface:
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__slots__ = ('_handlers',)
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def __init__(self, handlers: List[Callable[..., None]]) -> None:
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self._handlers = handlers
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def register_handler(self, handler: Callable[..., None]) -> 'SignalRegistrationInterface':
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self._handlers.append(handler)
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return self
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def unregister_handler(self, handler: Callable[..., None]) -> 'SignalRegistrationInterface':
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self._handlers.remove(handler)
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return self
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