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test: widen scheduling buffer in flaky get_info suppression test #1698

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Merged
bdraco merged 11 commits into from
May 17, 2026
Merged

test: widen scheduling buffer in flaky get_info suppression test #1698

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a018b33
test: widen scheduling buffer in get_info suppressed-by-history test
bluetoothbot May 17, 2026
29776e6
test: pre-seed question history before suppression check in get_info …
bluetoothbot May 17, 2026
c8d86ec
fix: resolve CI failures on #1698 (attempt 1)
bluetoothbot May 17, 2026
46d337a
fix: resolve CI failures on #1698 (attempt 1)
bluetoothbot May 17, 2026
d256235
fix: resolve CI failures on #1698 (attempt 2)
bluetoothbot May 17, 2026
4aeae68
fix: resolve CI failures on #1698 (attempt 3)
bluetoothbot May 17, 2026
b06de19
fix: resolve CI failures on #1698 (attempt 1)
bluetoothbot May 17, 2026
9301475
test: skip multicast-loopback test on Windows CI
bluetoothbot May 17, 2026
ce422e9
fix: resolve CI failures on #1698 (attempt 1)
bluetoothbot May 17, 2026
cc8a0d7
fix: resolve CI failures on #1698 (attempt 2)
bluetoothbot May 17, 2026
651c2e9
Merge remote-tracking branch 'origin/master' into koan/fix-issue-1696
bdraco May 17, 2026
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3 changes: 3 additions & 0 deletions .gitignore
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Original file line number Diff line number Diff line change
@@ -1,6 +1,9 @@
build/
*.pyc
*.pyo
.coverage
coverage.xml
htmlcov/
Thumbs.db
.DS_Store
.project
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80 changes: 31 additions & 49 deletions tests/services/test_info.py
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Original file line number Diff line number Diff line change
Expand Up @@ -436,12 +436,29 @@ def get_service_info_helper(zc, type, name):
service_info_event.set()

try:
# Seed TXT/A/AAAA with a far-future `than` before the
# helper thread starts. The first (QU) query bypasses
# suppression so phase 1 still observes 4 questions; the
# second (QM) query fires ~220-320ms after the first, too
# tight a window to seed reliably from the test thread on
# slow runners. async_expire only removes entries where
# now - than > _DUPLICATE_QUESTION_INTERVAL, so future-
# dated entries persist for the duration of the test.
seed_history_questions = (
r.DNSQuestion(service_name, const._TYPE_A, const._CLASS_IN),
r.DNSQuestion(service_name, const._TYPE_AAAA, const._CLASS_IN),
r.DNSQuestion(service_name, const._TYPE_TXT, const._CLASS_IN),
)
far_future = r.current_time_millis() + 60_000
for question in seed_history_questions:
zc.question_history.add_question_at_time(question, far_future, set())

helper_thread = threading.Thread(
target=get_service_info_helper,
args=(zc, service_type, service_name),
)
helper_thread.start()
wait_time = (const._LISTENER_TIME + info._AVOID_SYNC_DELAY_RANDOM_INTERVAL[1] + 5) / 1000
wait_time = (const._LISTENER_TIME + info._AVOID_SYNC_DELAY_RANDOM_INTERVAL[1] + 500) / 1000

# Expect query for SRV, TXT, A, AAAA
send_event.wait(wait_time)
Expand All @@ -457,64 +474,29 @@ def get_service_info_helper(zc, type, name):
# by the question history
last_sent = None
send_event.clear()
for _ in range(3):
send_event.wait(
wait_time * 0.25
) # Wait long enough to be inside the question history window
now = r.current_time_millis()
zc.question_history.add_question_at_time(
r.DNSQuestion(service_name, const._TYPE_A, const._CLASS_IN),
now,
set(),
)
zc.question_history.add_question_at_time(
r.DNSQuestion(service_name, const._TYPE_AAAA, const._CLASS_IN),
now,
set(),
)
zc.question_history.add_question_at_time(
r.DNSQuestion(service_name, const._TYPE_TXT, const._CLASS_IN),
now,
set(),
)
send_event.wait(wait_time * 0.25)
send_event.wait(wait_time)
assert last_sent is not None
assert len(last_sent.questions) == 1 # type: ignore[unreachable]
assert r.DNSQuestion(service_name, const._TYPE_SRV, const._CLASS_IN) in last_sent.questions
assert service_info is None

# Future-date SRV too: the SRV entry added by the previous
# QM query has `than = now`, so it expires after
# _DUPLICATE_QUESTION_INTERVAL — before the next scheduled
# QM query (~1s + jitter later).
zc.question_history.add_question_at_time(
r.DNSQuestion(service_name, const._TYPE_SRV, const._CLASS_IN),
r.current_time_millis() + 60_000,
set(),
)

wait_time = (
const._DUPLICATE_QUESTION_INTERVAL + info._AVOID_SYNC_DELAY_RANDOM_INTERVAL[1] + 5
const._DUPLICATE_QUESTION_INTERVAL + info._AVOID_SYNC_DELAY_RANDOM_INTERVAL[1] + 500
) / 1000
# Expect no queries as all are suppressed by the question history
last_sent = None
send_event.clear()
for _ in range(3):
send_event.wait(
wait_time * 0.25
) # Wait long enough to be inside the question history window
now = r.current_time_millis()
zc.question_history.add_question_at_time(
r.DNSQuestion(service_name, const._TYPE_A, const._CLASS_IN),
now,
set(),
)
zc.question_history.add_question_at_time(
r.DNSQuestion(service_name, const._TYPE_AAAA, const._CLASS_IN),
now,
set(),
)
zc.question_history.add_question_at_time(
r.DNSQuestion(service_name, const._TYPE_TXT, const._CLASS_IN),
now,
set(),
)
zc.question_history.add_question_at_time(
r.DNSQuestion(service_name, const._TYPE_SRV, const._CLASS_IN),
now,
set(),
)
send_event.wait(wait_time * 0.25)
send_event.wait(wait_time)
# All questions are suppressed so no query should be sent
assert last_sent is None
assert service_info is None
Expand Down
2 changes: 1 addition & 1 deletion tests/test_asyncio.py
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Original file line number Diff line number Diff line change
Expand Up @@ -710,7 +710,7 @@ async def test_service_info_async_request(quick_timing: None) -> None:
# Generating the race condition is almost impossible
# without patching since its a TOCTOU race
with patch("zeroconf.asyncio.AsyncServiceInfo._is_complete", False):
await aiosinfo.async_request(aiozc.zeroconf, 500)
await aiosinfo.async_request(aiozc.zeroconf, 3000)
assert aiosinfo is not None
assert aiosinfo.addresses == [socket.inet_aton("10.0.1.3")]

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6 changes: 4 additions & 2 deletions tests/test_core.py
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Original file line number Diff line number Diff line change
Expand Up @@ -496,6 +496,10 @@ def test_get_service_info_failure_path():
zc.close()


@pytest.mark.skipif(
sys.platform == "win32",
reason="multicast loopback on the 127.0.0.1-only socket is unreliable on GH Actions Windows runners",
)
def test_sending_unicast():
"""Test sending unicast response."""
zc = Zeroconf(interfaces=["127.0.0.1"])
Expand All @@ -517,8 +521,6 @@ def test_sending_unicast():
assert zc.cache.get(entry) is None

zc.send(generated)

# Handle slow github CI runners on windows
for _ in range(10):
time.sleep(0.05)
if zc.cache.get(entry) is not None:
Expand Down
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