Current File : //lib/python3/dist-packages/zeroconf/_updates.py
""" Multicast DNS Service Discovery for Python, v0.14-wmcbrine
Copyright 2003 Paul Scott-Murphy, 2014 William McBrine
This module provides a framework for the use of DNS Service Discovery
using IP multicast.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
USA
"""
from typing import List, NamedTuple, Optional, TYPE_CHECKING
from ._dns import DNSRecord
if TYPE_CHECKING:
from ._core import Zeroconf
class RecordUpdate(NamedTuple):
new: DNSRecord
old: Optional[DNSRecord]
class RecordUpdateListener:
"""Base call for all record listeners.
All listeners passed to async_add_listener should use RecordUpdateListener
as a base class. In the future it will be required.
"""
def update_record( # pylint: disable=no-self-use
self, zc: 'Zeroconf', now: float, record: DNSRecord
) -> None:
"""Update a single record.
This method is deprecated and will be removed in a future version.
update_records should be implemented instead.
"""
raise RuntimeError("update_record is deprecated and will be removed in a future version.")
def async_update_records(self, zc: 'Zeroconf', now: float, records: List[RecordUpdate]) -> None:
"""Update multiple records in one shot.
All records that are received in a single packet are passed
to update_records.
This implementation is a compatiblity shim to ensure older code
that uses RecordUpdateListener as a base class will continue to
get calls to update_record. This method will raise
NotImplementedError in a future version.
At this point the cache will not have the new records
Records are passed as a list of RecordUpdate. This
allows consumers of async_update_records to avoid cache lookups.
This method will be run in the event loop.
"""
for record in records:
self.update_record(zc, now, record[0])
def async_update_records_complete(self) -> None:
"""Called when a record update has completed for all handlers.
At this point the cache will have the new records.
This method will be run in the event loop.
"""
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