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"""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 __future__ import annotations
import asyncio
import socket
import time
from functools import cache
from unittest import mock
import ifaddr
from zeroconf import DNSIncoming, DNSQuestion, DNSRecord, Zeroconf
from zeroconf._history import QuestionHistory
_MONOTONIC_RESOLUTION = time.get_clock_info("monotonic").resolution
class QuestionHistoryWithoutSuppression(QuestionHistory):
def suppresses(self, question: DNSQuestion, now: float, known_answers: set[DNSRecord]) -> bool:
return False
def _inject_responses(zc: Zeroconf, msgs: list[DNSIncoming]) -> None:
"""Inject a DNSIncoming response."""
assert zc.loop is not None
async def _wait_for_response():
for msg in msgs:
zc.record_manager.async_updates_from_response(msg)
asyncio.run_coroutine_threadsafe(_wait_for_response(), zc.loop).result()
def _inject_response(zc: Zeroconf, msg: DNSIncoming) -> None:
"""Inject a DNSIncoming response."""
_inject_responses(zc, [msg])
def _wait_for_start(zc: Zeroconf) -> None:
"""Wait for all sockets to be up and running."""
assert zc.loop is not None
asyncio.run_coroutine_threadsafe(zc.async_wait_for_start(), zc.loop).result()
@cache
def has_working_ipv6():
"""Return True if the system can bind an IPv6 address."""
if not socket.has_ipv6:
return False
sock = None
try:
sock = socket.socket(socket.AF_INET6)
sock.bind(("::1", 0))
except Exception:
return False
finally:
if sock:
sock.close()
for iface in ifaddr.get_adapters():
for addr in iface.ips:
if addr.is_IPv6 and iface.index is not None:
return True
return False
def _clear_cache(zc: Zeroconf) -> None:
zc.cache.cache.clear()
zc.question_history.clear()
def time_changed_millis(millis: float | None = None) -> None:
"""Call all scheduled events for a time."""
loop = asyncio.get_running_loop()
loop_time = loop.time()
if millis is not None:
mock_seconds_into_future = millis / 1000
else:
mock_seconds_into_future = loop_time
with mock.patch("time.monotonic", return_value=mock_seconds_into_future):
for task in list(loop._scheduled): # type: ignore[attr-defined]
if not isinstance(task, asyncio.TimerHandle):
continue
if task.cancelled():
continue
future_seconds = task.when() - (loop_time + _MONOTONIC_RESOLUTION)
if mock_seconds_into_future >= future_seconds:
task._run()
task.cancel()
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