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import sys
import time
import signal
import asyncio
import subprocess as sp
from asyncio.queues import Queue
from typing import List, Tuple
import pytest
import psycopg
from psycopg import errors as e
from psycopg._compat import create_task
pytestmark = pytest.mark.asyncio
@pytest.mark.slow
async def test_commit_concurrency(aconn):
# Check the condition reported in psycopg2#103
# Because of bad status check, we commit even when a commit is already on
# its way. We can detect this condition by the warnings.
notices = Queue() # type: ignore[var-annotated]
aconn.add_notice_handler(lambda diag: notices.put_nowait(diag.message_primary))
stop = False
async def committer():
nonlocal stop
while not stop:
await aconn.commit()
await asyncio.sleep(0) # Allow the other worker to work
async def runner():
nonlocal stop
cur = aconn.cursor()
for i in range(1000):
await cur.execute("select %s;", (i,))
await aconn.commit()
# Stop the committer thread
stop = True
await asyncio.gather(committer(), runner())
assert notices.empty(), "%d notices raised" % notices.qsize()
@pytest.mark.slow
async def test_concurrent_execution(aconn_cls, dsn):
async def worker():
cnn = await aconn_cls.connect(dsn)
cur = cnn.cursor()
await cur.execute("select pg_sleep(0.5)")
await cur.close()
await cnn.close()
workers = [worker(), worker()]
t0 = time.time()
await asyncio.gather(*workers)
assert time.time() - t0 < 0.8, "something broken in concurrency"
@pytest.mark.slow
@pytest.mark.timing
@pytest.mark.crdb_skip("notify")
async def test_notifies(aconn_cls, aconn, dsn):
nconn = await aconn_cls.connect(dsn, autocommit=True)
npid = nconn.pgconn.backend_pid
async def notifier():
cur = nconn.cursor()
await asyncio.sleep(0.25)
await cur.execute("notify foo, '1'")
await asyncio.sleep(0.25)
await cur.execute("notify foo, '2'")
await nconn.close()
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.time()))
if len(ns) >= 2:
await gen.aclose()
ns: List[Tuple[psycopg.Notify, float]] = []
t0 = time.time()
workers = [notifier(), receiver()]
await asyncio.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)
async def canceller(aconn, errors):
try:
await asyncio.sleep(0.5)
aconn.cancel()
except Exception as exc:
errors.append(exc)
@pytest.mark.slow
@pytest.mark.crdb_skip("cancel")
async def test_cancel(aconn):
async def worker():
cur = aconn.cursor()
with pytest.raises(e.QueryCanceled):
await cur.execute("select pg_sleep(2)")
errors: List[Exception] = []
workers = [worker(), canceller(aconn, errors)]
t0 = time.time()
await asyncio.gather(*workers)
t1 = time.time()
assert not errors
assert 0.0 < t1 - t0 < 1.0
# still working
await aconn.rollback()
cur = aconn.cursor()
await cur.execute("select 1")
assert await cur.fetchone() == (1,)
@pytest.mark.slow
@pytest.mark.crdb_skip("cancel")
async def test_cancel_stream(aconn):
async def worker():
cur = aconn.cursor()
with pytest.raises(e.QueryCanceled):
async for row in cur.stream("select pg_sleep(2)"):
pass
errors: List[Exception] = []
workers = [worker(), canceller(aconn, errors)]
t0 = time.time()
await asyncio.gather(*workers)
t1 = time.time()
assert not errors
assert 0.0 < t1 - t0 < 1.0
# still working
await aconn.rollback()
cur = aconn.cursor()
await cur.execute("select 1")
assert await cur.fetchone() == (1,)
@pytest.mark.slow
@pytest.mark.crdb_skip("pg_terminate_backend")
async def test_identify_closure(aconn_cls, dsn):
async def closer():
await asyncio.sleep(0.2)
await conn2.execute(
"select pg_terminate_backend(%s)", [aconn.pgconn.backend_pid]
)
aconn = await aconn_cls.connect(dsn)
conn2 = await aconn_cls.connect(dsn)
try:
t = create_task(closer())
t0 = time.time()
try:
with pytest.raises(psycopg.OperationalError):
await aconn.execute("select pg_sleep(1.0)")
t1 = time.time()
assert 0.2 < t1 - t0 < 0.4
finally:
await asyncio.gather(t)
finally:
await aconn.close()
await conn2.close()
@pytest.mark.slow
@pytest.mark.subprocess
@pytest.mark.skipif(
sys.platform == "win32", reason="don't know how to Ctrl-C on Windows"
)
@pytest.mark.crdb_skip("cancel")
async def test_ctrl_c(dsn):
script = f"""\
import signal
import asyncio
import psycopg
async def main():
ctrl_c = False
loop = asyncio.get_event_loop()
async with await psycopg.AsyncConnection.connect({dsn!r}) as conn:
loop.add_signal_handler(signal.SIGINT, conn.cancel)
cur = conn.cursor()
try:
await cur.execute("select pg_sleep(2)")
except psycopg.errors.QueryCanceled:
ctrl_c = True
assert ctrl_c, "ctrl-c not received"
assert (
conn.info.transaction_status == psycopg.pq.TransactionStatus.INERROR
), f"transaction status: {{conn.info.transaction_status!r}}"
await conn.rollback()
assert (
conn.info.transaction_status == psycopg.pq.TransactionStatus.IDLE
), f"transaction status: {{conn.info.transaction_status!r}}"
await cur.execute("select 1")
assert (await cur.fetchone()) == (1,)
asyncio.run(main())
"""
if sys.platform == "win32":
creationflags = sp.CREATE_NEW_PROCESS_GROUP
sig = signal.CTRL_C_EVENT
else:
creationflags = 0
sig = signal.SIGINT
proc = sp.Popen([sys.executable, "-s", "-c", script], creationflags=creationflags)
with pytest.raises(sp.TimeoutExpired):
outs, errs = proc.communicate(timeout=1)
proc.send_signal(sig)
proc.communicate()
assert proc.returncode == 0
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