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from __future__ import annotations
from time import time
import pytest
from psycopg import Notify
from .utils import skip_free_threaded
from .acompat import AEvent, alist, asleep, gather, spawn
pytestmark = pytest.mark.crdb_skip("notify")
async def test_notify_handlers(aconn):
nots1 = []
nots2 = []
def cb1(n):
nots1.append(n)
aconn.add_notify_handler(cb1)
aconn.add_notify_handler(lambda n: nots2.append(n))
await aconn.set_autocommit(True)
await aconn.execute("listen foo")
await aconn.execute("notify foo, 'n1'")
assert len(nots1) == 1
n = nots1[0]
assert n.channel == "foo"
assert n.payload == "n1"
assert n.pid == aconn.pgconn.backend_pid
assert len(nots2) == 1
assert nots2[0] == nots1[0]
aconn.remove_notify_handler(cb1)
await aconn.execute("notify foo, 'n2'")
assert len(nots1) == 1
assert len(nots2) == 2
n = nots2[1]
assert isinstance(n, Notify)
assert n.channel == "foo"
assert n.payload == "n2"
assert n.pid == aconn.pgconn.backend_pid
assert hash(n)
with pytest.raises(ValueError):
aconn.remove_notify_handler(cb1)
@pytest.mark.slow
@pytest.mark.timing
async def test_notify(aconn_cls, aconn, dsn):
npid = None
async def notifier():
async with await aconn_cls.connect(dsn, autocommit=True) as nconn:
nonlocal npid
npid = nconn.pgconn.backend_pid
await asleep(0.25)
await nconn.execute("notify foo, '1'")
await asleep(0.25)
await nconn.execute("notify foo, '2'")
async def receiver():
await aconn.set_autocommit(True)
cur = aconn.cursor()
await cur.execute("listen foo")
gen = aconn.notifies()
async for n in gen:
ns.append((n, time()))
if len(ns) >= 2:
await gen.aclose()
ns: list[tuple[Notify, float]] = []
t0 = time()
workers = [spawn(notifier), spawn(receiver)]
await gather(*workers)
assert len(ns) == 2
n, t1 = ns[0]
assert n.pid == npid
assert n.channel == "foo"
assert n.payload == "1"
assert t1 - t0 == pytest.approx(0.25, abs=0.05)
n, t1 = ns[1]
assert n.pid == npid
assert n.channel == "foo"
assert n.payload == "2"
assert t1 - t0 == pytest.approx(0.5, abs=0.05)
@pytest.mark.slow
@pytest.mark.timing
async def test_no_notify_timeout(aconn):
await aconn.set_autocommit(True)
t0 = time()
async for n in aconn.notifies(timeout=0.5):
assert False
dt = time() - t0
assert 0.5 <= dt < 0.75
@pytest.mark.slow
@pytest.mark.timing
async def test_notify_timeout(aconn_cls, aconn, dsn):
await aconn.set_autocommit(True)
await aconn.execute("listen foo")
async def notifier():
async with await aconn_cls.connect(dsn, autocommit=True) as nconn:
await asleep(0.25)
await nconn.execute("notify foo, '1'")
worker = spawn(notifier)
try:
times = [time()]
async for n in aconn.notifies(timeout=0.5):
times.append(time())
times.append(time())
finally:
await gather(worker)
assert len(times) == 3
assert times[1] - times[0] == pytest.approx(0.25, 0.1)
assert times[2] - times[1] == pytest.approx(0.25, 0.1)
@pytest.mark.slow
@pytest.mark.timing
async def test_notify_timeout_0(aconn_cls, aconn, dsn):
await aconn.set_autocommit(True)
await aconn.execute("listen foo")
ns = await alist(aconn.notifies(timeout=0))
assert not ns
async with await aconn_cls.connect(dsn, autocommit=True) as nconn:
await nconn.execute("notify foo, '1'")
await asleep(0.1)
ns = await alist(aconn.notifies(timeout=0))
assert len(ns) == 1
@pytest.mark.slow
@pytest.mark.timing
async def test_stop_after(aconn_cls, aconn, dsn):
await aconn.set_autocommit(True)
await aconn.execute("listen foo")
async def notifier():
async with await aconn_cls.connect(dsn, autocommit=True) as nconn:
await nconn.execute("notify foo, '1'")
await asleep(0.1)
await nconn.execute("notify foo, '2'")
await asleep(0.1)
await nconn.execute("notify foo, '3'")
worker = spawn(notifier)
try:
ns = await alist(aconn.notifies(timeout=1.0, stop_after=2))
assert len(ns) == 2
assert ns[0].payload == "1"
assert ns[1].payload == "2"
finally:
await gather(worker)
ns = await alist(aconn.notifies(timeout=0.0))
assert len(ns) == 1
assert ns[0].payload == "3"
@pytest.mark.timing
async def test_stop_after_batch(aconn_cls, aconn, dsn):
await aconn.set_autocommit(True)
await aconn.execute("listen foo")
async def notifier():
async with await aconn_cls.connect(dsn, autocommit=True) as nconn:
async with nconn.transaction():
await nconn.execute("notify foo, '1'")
await nconn.execute("notify foo, '2'")
worker = spawn(notifier)
try:
ns = await alist(aconn.notifies(timeout=1.0, stop_after=1))
assert len(ns) == 2
assert ns[0].payload == "1"
assert ns[1].payload == "2"
finally:
await gather(worker)
@pytest.mark.slow
@pytest.mark.timing
async def test_notifies_blocking(aconn):
async def listener():
async for _ in aconn.notifies(timeout=1):
pass
worker = spawn(listener)
try:
# Make sure the listener is listening
if not aconn.lock.locked():
await asleep(0.01)
t0 = time()
await aconn.execute("select 1")
dt = time() - t0
finally:
await gather(worker)
assert dt > 0.5
@pytest.mark.slow
@skip_free_threaded("warnings are context-local in the free-threaded build >= 3.14")
async def test_generator_and_handler(aconn, aconn_cls, dsn, recwarn):
# NOTE: we don't support generator+handlers anymore. So, if in the future
# this behaviour will change, we will not consider it a regression. However
# we will want to keep the warning check.
recwarn.clear()
await aconn.set_autocommit(True)
await aconn.execute("listen foo")
n1 = None
n2 = None
def set_n2(n):
nonlocal n2
n2 = n
aconn.add_notify_handler(set_n2)
async def listener():
nonlocal n1
async for n1 in aconn.notifies(timeout=1, stop_after=1):
pass
worker = spawn(listener)
try:
# Make sure the listener is listening
if not aconn.lock.locked():
await asleep(0.01)
async with await aconn_cls.connect(dsn, autocommit=True) as nconn:
await nconn.execute("notify foo, '1'")
finally:
await gather(worker)
assert n1
assert n2
msg = str(recwarn.pop(RuntimeWarning).message)
assert "notifies()" in msg
@pytest.mark.parametrize("query_between", [True, False])
async def test_first_notify_not_lost(aconn, aconn_cls, dsn, query_between):
await aconn.set_autocommit(True)
await aconn.execute("listen foo")
async with await aconn_cls.connect(dsn, autocommit=True) as conn2:
await conn2.execute("notify foo, 'hi'")
if query_between:
await aconn.execute("select 1")
n = None
async for n in aconn.notifies(timeout=1, stop_after=1):
pass
assert n
@pytest.mark.slow
@pytest.mark.timing
@pytest.mark.parametrize("sleep_on", ["server", "client"])
@pytest.mark.parametrize("listen_by", ["callback", "generator"])
async def test_notify_query_notify(aconn_cls, dsn, sleep_on, listen_by):
e = AEvent()
notifies: list[int] = []
workers = []
async def notifier():
async with await aconn_cls.connect(dsn, autocommit=True) as aconn:
await asleep(0.1)
for i in range(3):
await aconn.execute("select pg_notify('counter', %s)", (str(i),))
await asleep(0.2)
async def nap(aconn):
if sleep_on == "server":
await aconn.execute("select pg_sleep(0.2)")
else:
assert sleep_on == "client"
await asleep(0.2)
if listen_by == "callback":
async def listener():
async with await aconn_cls.connect(dsn, autocommit=True) as aconn:
aconn.add_notify_handler(lambda n: notifies.append(int(n.payload)))
await aconn.execute("listen counter")
e.set()
await nap(aconn)
await aconn.execute("")
await nap(aconn)
await aconn.execute("")
await nap(aconn)
await aconn.execute("")
else:
async def listener():
async with await aconn_cls.connect(dsn, autocommit=True) as aconn:
await aconn.execute("listen counter")
e.set()
async for n in aconn.notifies(timeout=0.2):
notifies.append(int(n.payload))
await nap(aconn)
async for n in aconn.notifies(timeout=0.2):
notifies.append(int(n.payload))
workers.append(spawn(listener))
await e.wait()
workers.append(spawn(notifier))
await gather(*workers)
assert notifies == list(range(3))
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