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-rw-r--r--tests/pool/test_pool.py1265
1 files changed, 1265 insertions, 0 deletions
diff --git a/tests/pool/test_pool.py b/tests/pool/test_pool.py
new file mode 100644
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--- /dev/null
+++ b/tests/pool/test_pool.py
@@ -0,0 +1,1265 @@
+import logging
+import weakref
+from time import sleep, time
+from threading import Thread, Event
+from typing import Any, List, Tuple
+
+import pytest
+
+import psycopg
+from psycopg.pq import TransactionStatus
+from psycopg._compat import Counter
+
+try:
+ import psycopg_pool as pool
+except ImportError:
+ # Tests should have been skipped if the package is not available
+ pass
+
+
+def test_package_version(mypy):
+ cp = mypy.run_on_source(
+ """\
+from psycopg_pool import __version__
+assert __version__
+"""
+ )
+ assert not cp.stdout
+
+
+def test_defaults(dsn):
+ with pool.ConnectionPool(dsn) as p:
+ assert p.min_size == p.max_size == 4
+ assert p.timeout == 30
+ assert p.max_idle == 10 * 60
+ assert p.max_lifetime == 60 * 60
+ assert p.num_workers == 3
+
+
+@pytest.mark.parametrize("min_size, max_size", [(2, None), (0, 2), (2, 4)])
+def test_min_size_max_size(dsn, min_size, max_size):
+ with pool.ConnectionPool(dsn, min_size=min_size, max_size=max_size) as p:
+ assert p.min_size == min_size
+ assert p.max_size == max_size if max_size is not None else min_size
+
+
+@pytest.mark.parametrize("min_size, max_size", [(0, 0), (0, None), (-1, None), (4, 2)])
+def test_bad_size(dsn, min_size, max_size):
+ with pytest.raises(ValueError):
+ pool.ConnectionPool(min_size=min_size, max_size=max_size)
+
+
+def test_connection_class(dsn):
+ class MyConn(psycopg.Connection[Any]):
+ pass
+
+ with pool.ConnectionPool(dsn, connection_class=MyConn, min_size=1) as p:
+ with p.connection() as conn:
+ assert isinstance(conn, MyConn)
+
+
+def test_kwargs(dsn):
+ with pool.ConnectionPool(dsn, kwargs={"autocommit": True}, min_size=1) as p:
+ with p.connection() as conn:
+ assert conn.autocommit
+
+
+@pytest.mark.crdb_skip("backend pid")
+def test_its_really_a_pool(dsn):
+ with pool.ConnectionPool(dsn, min_size=2) as p:
+ with p.connection() as conn:
+ pid1 = conn.info.backend_pid
+
+ with p.connection() as conn2:
+ pid2 = conn2.info.backend_pid
+
+ with p.connection() as conn:
+ assert conn.info.backend_pid in (pid1, pid2)
+
+
+def test_context(dsn):
+ with pool.ConnectionPool(dsn, min_size=1) as p:
+ assert not p.closed
+ assert p.closed
+
+
+@pytest.mark.crdb_skip("backend pid")
+def test_connection_not_lost(dsn):
+ with pool.ConnectionPool(dsn, min_size=1) as p:
+ with pytest.raises(ZeroDivisionError):
+ with p.connection() as conn:
+ pid = conn.info.backend_pid
+ 1 / 0
+
+ with p.connection() as conn2:
+ assert conn2.info.backend_pid == pid
+
+
+@pytest.mark.slow
+@pytest.mark.timing
+def test_concurrent_filling(dsn, monkeypatch):
+ delay_connection(monkeypatch, 0.1)
+
+ def add_time(self, conn):
+ times.append(time() - t0)
+ add_orig(self, conn)
+
+ add_orig = pool.ConnectionPool._add_to_pool
+ monkeypatch.setattr(pool.ConnectionPool, "_add_to_pool", add_time)
+
+ times: List[float] = []
+ t0 = time()
+
+ with pool.ConnectionPool(dsn, min_size=5, num_workers=2) as p:
+ p.wait(1.0)
+ want_times = [0.1, 0.1, 0.2, 0.2, 0.3]
+ assert len(times) == len(want_times)
+ for got, want in zip(times, want_times):
+ assert got == pytest.approx(want, 0.1), times
+
+
+@pytest.mark.slow
+@pytest.mark.timing
+def test_wait_ready(dsn, monkeypatch):
+ delay_connection(monkeypatch, 0.1)
+ with pytest.raises(pool.PoolTimeout):
+ with pool.ConnectionPool(dsn, min_size=4, num_workers=1) as p:
+ p.wait(0.3)
+
+ with pool.ConnectionPool(dsn, min_size=4, num_workers=1) as p:
+ p.wait(0.5)
+
+ with pool.ConnectionPool(dsn, min_size=4, num_workers=2) as p:
+ p.wait(0.3)
+ p.wait(0.0001) # idempotent
+
+
+def test_wait_closed(dsn):
+ with pool.ConnectionPool(dsn) as p:
+ pass
+
+ with pytest.raises(pool.PoolClosed):
+ p.wait()
+
+
+@pytest.mark.slow
+def test_setup_no_timeout(dsn, proxy):
+ with pytest.raises(pool.PoolTimeout):
+ with pool.ConnectionPool(proxy.client_dsn, min_size=1, num_workers=1) as p:
+ p.wait(0.2)
+
+ with pool.ConnectionPool(proxy.client_dsn, min_size=1, num_workers=1) as p:
+ sleep(0.5)
+ assert not p._pool
+ proxy.start()
+
+ with p.connection() as conn:
+ conn.execute("select 1")
+
+
+def test_configure(dsn):
+ inits = 0
+
+ def configure(conn):
+ nonlocal inits
+ inits += 1
+ with conn.transaction():
+ conn.execute("set default_transaction_read_only to on")
+
+ with pool.ConnectionPool(dsn, min_size=1, configure=configure) as p:
+ p.wait()
+ with p.connection() as conn:
+ assert inits == 1
+ res = conn.execute("show default_transaction_read_only")
+ assert res.fetchone()[0] == "on" # type: ignore[index]
+
+ with p.connection() as conn:
+ assert inits == 1
+ res = conn.execute("show default_transaction_read_only")
+ assert res.fetchone()[0] == "on" # type: ignore[index]
+ conn.close()
+
+ with p.connection() as conn:
+ assert inits == 2
+ res = conn.execute("show default_transaction_read_only")
+ assert res.fetchone()[0] == "on" # type: ignore[index]
+
+
+@pytest.mark.slow
+def test_configure_badstate(dsn, caplog):
+ caplog.set_level(logging.WARNING, logger="psycopg.pool")
+
+ def configure(conn):
+ conn.execute("select 1")
+
+ with pool.ConnectionPool(dsn, min_size=1, configure=configure) as p:
+ with pytest.raises(pool.PoolTimeout):
+ p.wait(timeout=0.5)
+
+ assert caplog.records
+ assert "INTRANS" in caplog.records[0].message
+
+
+@pytest.mark.slow
+def test_configure_broken(dsn, caplog):
+ caplog.set_level(logging.WARNING, logger="psycopg.pool")
+
+ def configure(conn):
+ with conn.transaction():
+ conn.execute("WAT")
+
+ with pool.ConnectionPool(dsn, min_size=1, configure=configure) as p:
+ with pytest.raises(pool.PoolTimeout):
+ p.wait(timeout=0.5)
+
+ assert caplog.records
+ assert "WAT" in caplog.records[0].message
+
+
+def test_reset(dsn):
+ resets = 0
+
+ def setup(conn):
+ with conn.transaction():
+ conn.execute("set timezone to '+1:00'")
+
+ def reset(conn):
+ nonlocal resets
+ resets += 1
+ with conn.transaction():
+ conn.execute("set timezone to utc")
+
+ with pool.ConnectionPool(dsn, min_size=1, reset=reset) as p:
+ with p.connection() as conn:
+ assert resets == 0
+ conn.execute("set timezone to '+2:00'")
+
+ p.wait()
+ assert resets == 1
+
+ with p.connection() as conn:
+ with conn.execute("show timezone") as cur:
+ assert cur.fetchone() == ("UTC",)
+
+ p.wait()
+ assert resets == 2
+
+
+@pytest.mark.crdb_skip("backend pid")
+def test_reset_badstate(dsn, caplog):
+ caplog.set_level(logging.WARNING, logger="psycopg.pool")
+
+ def reset(conn):
+ conn.execute("reset all")
+
+ with pool.ConnectionPool(dsn, min_size=1, reset=reset) as p:
+ with p.connection() as conn:
+ conn.execute("select 1")
+ pid1 = conn.info.backend_pid
+
+ with p.connection() as conn:
+ conn.execute("select 1")
+ pid2 = conn.info.backend_pid
+
+ assert pid1 != pid2
+ assert caplog.records
+ assert "INTRANS" in caplog.records[0].message
+
+
+@pytest.mark.crdb_skip("backend pid")
+def test_reset_broken(dsn, caplog):
+ caplog.set_level(logging.WARNING, logger="psycopg.pool")
+
+ def reset(conn):
+ with conn.transaction():
+ conn.execute("WAT")
+
+ with pool.ConnectionPool(dsn, min_size=1, reset=reset) as p:
+ with p.connection() as conn:
+ conn.execute("select 1")
+ pid1 = conn.info.backend_pid
+
+ with p.connection() as conn:
+ conn.execute("select 1")
+ pid2 = conn.info.backend_pid
+
+ assert pid1 != pid2
+ assert caplog.records
+ assert "WAT" in caplog.records[0].message
+
+
+@pytest.mark.slow
+@pytest.mark.timing
+@pytest.mark.crdb_skip("backend pid")
+def test_queue(dsn):
+ def worker(n):
+ t0 = time()
+ with p.connection() as conn:
+ conn.execute("select pg_sleep(0.2)")
+ pid = conn.info.backend_pid
+ t1 = time()
+ results.append((n, t1 - t0, pid))
+
+ results: List[Tuple[int, float, int]] = []
+ with pool.ConnectionPool(dsn, min_size=2) as p:
+ p.wait()
+ ts = [Thread(target=worker, args=(i,)) for i in range(6)]
+ for t in ts:
+ t.start()
+ for t in ts:
+ t.join()
+
+ times = [item[1] for item in results]
+ want_times = [0.2, 0.2, 0.4, 0.4, 0.6, 0.6]
+ for got, want in zip(times, want_times):
+ assert got == pytest.approx(want, 0.1), times
+
+ assert len(set(r[2] for r in results)) == 2, results
+
+
+@pytest.mark.slow
+def test_queue_size(dsn):
+ def worker(t, ev=None):
+ try:
+ with p.connection():
+ if ev:
+ ev.set()
+ sleep(t)
+ except pool.TooManyRequests as e:
+ errors.append(e)
+ else:
+ success.append(True)
+
+ errors: List[Exception] = []
+ success: List[bool] = []
+
+ with pool.ConnectionPool(dsn, min_size=1, max_waiting=3) as p:
+ p.wait()
+ ev = Event()
+ t = Thread(target=worker, args=(0.3, ev))
+ t.start()
+ ev.wait()
+
+ ts = [Thread(target=worker, args=(0.1,)) for i in range(4)]
+ for t in ts:
+ t.start()
+ for t in ts:
+ t.join()
+
+ assert len(success) == 4
+ assert len(errors) == 1
+ assert isinstance(errors[0], pool.TooManyRequests)
+ assert p.name in str(errors[0])
+ assert str(p.max_waiting) in str(errors[0])
+ assert p.get_stats()["requests_errors"] == 1
+
+
+@pytest.mark.slow
+@pytest.mark.timing
+@pytest.mark.crdb_skip("backend pid")
+def test_queue_timeout(dsn):
+ def worker(n):
+ t0 = time()
+ try:
+ with p.connection() as conn:
+ conn.execute("select pg_sleep(0.2)")
+ pid = conn.info.backend_pid
+ except pool.PoolTimeout as e:
+ t1 = time()
+ errors.append((n, t1 - t0, e))
+ else:
+ t1 = time()
+ results.append((n, t1 - t0, pid))
+
+ results: List[Tuple[int, float, int]] = []
+ errors: List[Tuple[int, float, Exception]] = []
+
+ with pool.ConnectionPool(dsn, min_size=2, timeout=0.1) as p:
+ ts = [Thread(target=worker, args=(i,)) for i in range(4)]
+ for t in ts:
+ t.start()
+ for t in ts:
+ t.join()
+
+ assert len(results) == 2
+ assert len(errors) == 2
+ for e in errors:
+ assert 0.1 < e[1] < 0.15
+
+
+@pytest.mark.slow
+@pytest.mark.timing
+def test_dead_client(dsn):
+ def worker(i, timeout):
+ try:
+ with p.connection(timeout=timeout) as conn:
+ conn.execute("select pg_sleep(0.3)")
+ results.append(i)
+ except pool.PoolTimeout:
+ if timeout > 0.2:
+ raise
+
+ results: List[int] = []
+
+ with pool.ConnectionPool(dsn, min_size=2) as p:
+ ts = [
+ Thread(target=worker, args=(i, timeout))
+ for i, timeout in enumerate([0.4, 0.4, 0.1, 0.4, 0.4])
+ ]
+ for t in ts:
+ t.start()
+ for t in ts:
+ t.join()
+ sleep(0.2)
+ assert set(results) == set([0, 1, 3, 4])
+ assert len(p._pool) == 2 # no connection was lost
+
+
+@pytest.mark.slow
+@pytest.mark.timing
+@pytest.mark.crdb_skip("backend pid")
+def test_queue_timeout_override(dsn):
+ def worker(n):
+ t0 = time()
+ timeout = 0.25 if n == 3 else None
+ try:
+ with p.connection(timeout=timeout) as conn:
+ conn.execute("select pg_sleep(0.2)")
+ pid = conn.info.backend_pid
+ except pool.PoolTimeout as e:
+ t1 = time()
+ errors.append((n, t1 - t0, e))
+ else:
+ t1 = time()
+ results.append((n, t1 - t0, pid))
+
+ results: List[Tuple[int, float, int]] = []
+ errors: List[Tuple[int, float, Exception]] = []
+
+ with pool.ConnectionPool(dsn, min_size=2, timeout=0.1) as p:
+ ts = [Thread(target=worker, args=(i,)) for i in range(4)]
+ for t in ts:
+ t.start()
+ for t in ts:
+ t.join()
+
+ assert len(results) == 3
+ assert len(errors) == 1
+ for e in errors:
+ assert 0.1 < e[1] < 0.15
+
+
+@pytest.mark.crdb_skip("backend pid")
+def test_broken_reconnect(dsn):
+ with pool.ConnectionPool(dsn, min_size=1) as p:
+ with p.connection() as conn:
+ pid1 = conn.info.backend_pid
+ conn.close()
+
+ with p.connection() as conn2:
+ pid2 = conn2.info.backend_pid
+
+ assert pid1 != pid2
+
+
+@pytest.mark.crdb_skip("backend pid")
+def test_intrans_rollback(dsn, caplog):
+ caplog.set_level(logging.WARNING, logger="psycopg.pool")
+
+ with pool.ConnectionPool(dsn, min_size=1) as p:
+ conn = p.getconn()
+ pid = conn.info.backend_pid
+ conn.execute("create table test_intrans_rollback ()")
+ assert conn.info.transaction_status == TransactionStatus.INTRANS
+ p.putconn(conn)
+
+ with p.connection() as conn2:
+ assert conn2.info.backend_pid == pid
+ assert conn2.info.transaction_status == TransactionStatus.IDLE
+ assert not conn2.execute(
+ "select 1 from pg_class where relname = 'test_intrans_rollback'"
+ ).fetchone()
+
+ assert len(caplog.records) == 1
+ assert "INTRANS" in caplog.records[0].message
+
+
+@pytest.mark.crdb_skip("backend pid")
+def test_inerror_rollback(dsn, caplog):
+ caplog.set_level(logging.WARNING, logger="psycopg.pool")
+
+ with pool.ConnectionPool(dsn, min_size=1) as p:
+ conn = p.getconn()
+ pid = conn.info.backend_pid
+ with pytest.raises(psycopg.ProgrammingError):
+ conn.execute("wat")
+ assert conn.info.transaction_status == TransactionStatus.INERROR
+ p.putconn(conn)
+
+ with p.connection() as conn2:
+ assert conn2.info.backend_pid == pid
+ assert conn2.info.transaction_status == TransactionStatus.IDLE
+
+ assert len(caplog.records) == 1
+ assert "INERROR" in caplog.records[0].message
+
+
+@pytest.mark.crdb_skip("backend pid")
+@pytest.mark.crdb_skip("copy")
+def test_active_close(dsn, caplog):
+ caplog.set_level(logging.WARNING, logger="psycopg.pool")
+
+ with pool.ConnectionPool(dsn, min_size=1) as p:
+ conn = p.getconn()
+ pid = conn.info.backend_pid
+ conn.pgconn.exec_(b"copy (select * from generate_series(1, 10)) to stdout")
+ assert conn.info.transaction_status == TransactionStatus.ACTIVE
+ p.putconn(conn)
+
+ with p.connection() as conn2:
+ assert conn2.info.backend_pid != pid
+ assert conn2.info.transaction_status == TransactionStatus.IDLE
+
+ assert len(caplog.records) == 2
+ assert "ACTIVE" in caplog.records[0].message
+ assert "BAD" in caplog.records[1].message
+
+
+@pytest.mark.crdb_skip("backend pid")
+def test_fail_rollback_close(dsn, caplog, monkeypatch):
+ caplog.set_level(logging.WARNING, logger="psycopg.pool")
+
+ with pool.ConnectionPool(dsn, min_size=1) as p:
+ conn = p.getconn()
+
+ def bad_rollback():
+ conn.pgconn.finish()
+ orig_rollback()
+
+ # Make the rollback fail
+ orig_rollback = conn.rollback
+ monkeypatch.setattr(conn, "rollback", bad_rollback)
+
+ pid = conn.info.backend_pid
+ with pytest.raises(psycopg.ProgrammingError):
+ conn.execute("wat")
+ assert conn.info.transaction_status == TransactionStatus.INERROR
+ p.putconn(conn)
+
+ with p.connection() as conn2:
+ assert conn2.info.backend_pid != pid
+ assert conn2.info.transaction_status == TransactionStatus.IDLE
+
+ assert len(caplog.records) == 3
+ assert "INERROR" in caplog.records[0].message
+ assert "OperationalError" in caplog.records[1].message
+ assert "BAD" in caplog.records[2].message
+
+
+def test_close_no_threads(dsn):
+ p = pool.ConnectionPool(dsn)
+ assert p._sched_runner and p._sched_runner.is_alive()
+ workers = p._workers[:]
+ assert workers
+ for t in workers:
+ assert t.is_alive()
+
+ p.close()
+ assert p._sched_runner is None
+ assert not p._workers
+ for t in workers:
+ assert not t.is_alive()
+
+
+def test_putconn_no_pool(conn_cls, dsn):
+ with pool.ConnectionPool(dsn, min_size=1) as p:
+ conn = conn_cls.connect(dsn)
+ with pytest.raises(ValueError):
+ p.putconn(conn)
+
+ conn.close()
+
+
+def test_putconn_wrong_pool(dsn):
+ with pool.ConnectionPool(dsn, min_size=1) as p1:
+ with pool.ConnectionPool(dsn, min_size=1) as p2:
+ conn = p1.getconn()
+ with pytest.raises(ValueError):
+ p2.putconn(conn)
+
+
+def test_del_no_warning(dsn, recwarn):
+ p = pool.ConnectionPool(dsn, min_size=2)
+ with p.connection() as conn:
+ conn.execute("select 1")
+
+ p.wait()
+ ref = weakref.ref(p)
+ del p
+ assert not ref()
+ assert not recwarn, [str(w.message) for w in recwarn.list]
+
+
+@pytest.mark.slow
+def test_del_stop_threads(dsn):
+ p = pool.ConnectionPool(dsn)
+ assert p._sched_runner is not None
+ ts = [p._sched_runner] + p._workers
+ del p
+ sleep(0.1)
+ for t in ts:
+ assert not t.is_alive()
+
+
+def test_closed_getconn(dsn):
+ p = pool.ConnectionPool(dsn, min_size=1)
+ assert not p.closed
+ with p.connection():
+ pass
+
+ p.close()
+ assert p.closed
+
+ with pytest.raises(pool.PoolClosed):
+ with p.connection():
+ pass
+
+
+def test_closed_putconn(dsn):
+ p = pool.ConnectionPool(dsn, min_size=1)
+
+ with p.connection() as conn:
+ pass
+ assert not conn.closed
+
+ with p.connection() as conn:
+ p.close()
+ assert conn.closed
+
+
+def test_closed_queue(dsn):
+ def w1():
+ with p.connection() as conn:
+ e1.set() # Tell w0 that w1 got a connection
+ cur = conn.execute("select 1")
+ assert cur.fetchone() == (1,)
+ e2.wait() # Wait until w0 has tested w2
+ success.append("w1")
+
+ def w2():
+ try:
+ with p.connection():
+ pass # unexpected
+ except pool.PoolClosed:
+ success.append("w2")
+
+ e1 = Event()
+ e2 = Event()
+
+ p = pool.ConnectionPool(dsn, min_size=1)
+ p.wait()
+ success: List[str] = []
+
+ t1 = Thread(target=w1)
+ t1.start()
+ # Wait until w1 has received a connection
+ e1.wait()
+
+ t2 = Thread(target=w2)
+ t2.start()
+ # Wait until w2 is in the queue
+ ensure_waiting(p)
+
+ p.close(0)
+
+ # Wait for the workers to finish
+ e2.set()
+ t1.join()
+ t2.join()
+ assert len(success) == 2
+
+
+def test_open_explicit(dsn):
+ p = pool.ConnectionPool(dsn, open=False)
+ assert p.closed
+ with pytest.raises(pool.PoolClosed, match="is not open yet"):
+ p.getconn()
+
+ with pytest.raises(pool.PoolClosed):
+ with p.connection():
+ pass
+
+ p.open()
+ try:
+ assert not p.closed
+
+ with p.connection() as conn:
+ cur = conn.execute("select 1")
+ assert cur.fetchone() == (1,)
+
+ finally:
+ p.close()
+
+ with pytest.raises(pool.PoolClosed, match="is already closed"):
+ p.getconn()
+
+
+def test_open_context(dsn):
+ p = pool.ConnectionPool(dsn, open=False)
+ assert p.closed
+
+ with p:
+ assert not p.closed
+
+ with p.connection() as conn:
+ cur = conn.execute("select 1")
+ assert cur.fetchone() == (1,)
+
+ assert p.closed
+
+
+def test_open_no_op(dsn):
+ p = pool.ConnectionPool(dsn)
+ try:
+ assert not p.closed
+ p.open()
+ assert not p.closed
+
+ with p.connection() as conn:
+ cur = conn.execute("select 1")
+ assert cur.fetchone() == (1,)
+
+ finally:
+ p.close()
+
+
+@pytest.mark.slow
+@pytest.mark.timing
+def test_open_wait(dsn, monkeypatch):
+ delay_connection(monkeypatch, 0.1)
+ with pytest.raises(pool.PoolTimeout):
+ p = pool.ConnectionPool(dsn, min_size=4, num_workers=1, open=False)
+ try:
+ p.open(wait=True, timeout=0.3)
+ finally:
+ p.close()
+
+ p = pool.ConnectionPool(dsn, min_size=4, num_workers=1, open=False)
+ try:
+ p.open(wait=True, timeout=0.5)
+ finally:
+ p.close()
+
+
+@pytest.mark.slow
+@pytest.mark.timing
+def test_open_as_wait(dsn, monkeypatch):
+ delay_connection(monkeypatch, 0.1)
+ with pytest.raises(pool.PoolTimeout):
+ with pool.ConnectionPool(dsn, min_size=4, num_workers=1) as p:
+ p.open(wait=True, timeout=0.3)
+
+ with pool.ConnectionPool(dsn, min_size=4, num_workers=1) as p:
+ p.open(wait=True, timeout=0.5)
+
+
+def test_reopen(dsn):
+ p = pool.ConnectionPool(dsn)
+ with p.connection() as conn:
+ conn.execute("select 1")
+ p.close()
+ assert p._sched_runner is None
+ assert not p._workers
+
+ with pytest.raises(psycopg.OperationalError, match="cannot be reused"):
+ p.open()
+
+
+@pytest.mark.slow
+@pytest.mark.timing
+@pytest.mark.parametrize(
+ "min_size, want_times",
+ [
+ (2, [0.25, 0.25, 0.35, 0.45, 0.50, 0.50, 0.60, 0.70]),
+ (0, [0.35, 0.45, 0.55, 0.60, 0.65, 0.70, 0.80, 0.85]),
+ ],
+)
+def test_grow(dsn, monkeypatch, min_size, want_times):
+ delay_connection(monkeypatch, 0.1)
+
+ def worker(n):
+ t0 = time()
+ with p.connection() as conn:
+ conn.execute("select 1 from pg_sleep(0.25)")
+ t1 = time()
+ results.append((n, t1 - t0))
+
+ with pool.ConnectionPool(dsn, min_size=min_size, max_size=4, num_workers=3) as p:
+ p.wait(1.0)
+ results: List[Tuple[int, float]] = []
+
+ ts = [Thread(target=worker, args=(i,)) for i in range(len(want_times))]
+ for t in ts:
+ t.start()
+ for t in ts:
+ t.join()
+
+ times = [item[1] for item in results]
+ for got, want in zip(times, want_times):
+ assert got == pytest.approx(want, 0.1), times
+
+
+@pytest.mark.slow
+@pytest.mark.timing
+def test_shrink(dsn, monkeypatch):
+
+ from psycopg_pool.pool import ShrinkPool
+
+ results: List[Tuple[int, int]] = []
+
+ def run_hacked(self, pool):
+ n0 = pool._nconns
+ orig_run(self, pool)
+ n1 = pool._nconns
+ results.append((n0, n1))
+
+ orig_run = ShrinkPool._run
+ monkeypatch.setattr(ShrinkPool, "_run", run_hacked)
+
+ def worker(n):
+ with p.connection() as conn:
+ conn.execute("select pg_sleep(0.1)")
+
+ with pool.ConnectionPool(dsn, min_size=2, max_size=4, max_idle=0.2) as p:
+ p.wait(5.0)
+ assert p.max_idle == 0.2
+
+ ts = [Thread(target=worker, args=(i,)) for i in range(4)]
+ for t in ts:
+ t.start()
+ for t in ts:
+ t.join()
+ sleep(1)
+
+ assert results == [(4, 4), (4, 3), (3, 2), (2, 2), (2, 2)]
+
+
+@pytest.mark.slow
+def test_reconnect(proxy, caplog, monkeypatch):
+ caplog.set_level(logging.WARNING, logger="psycopg.pool")
+
+ assert pool.base.ConnectionAttempt.INITIAL_DELAY == 1.0
+ assert pool.base.ConnectionAttempt.DELAY_JITTER == 0.1
+ monkeypatch.setattr(pool.base.ConnectionAttempt, "INITIAL_DELAY", 0.1)
+ monkeypatch.setattr(pool.base.ConnectionAttempt, "DELAY_JITTER", 0.0)
+
+ caplog.clear()
+ proxy.start()
+ with pool.ConnectionPool(proxy.client_dsn, min_size=1) as p:
+ p.wait(2.0)
+ proxy.stop()
+
+ with pytest.raises(psycopg.OperationalError):
+ with p.connection() as conn:
+ conn.execute("select 1")
+
+ sleep(1.0)
+ proxy.start()
+ p.wait()
+
+ with p.connection() as conn:
+ conn.execute("select 1")
+
+ assert "BAD" in caplog.messages[0]
+ times = [rec.created for rec in caplog.records]
+ assert times[1] - times[0] < 0.05
+ deltas = [times[i + 1] - times[i] for i in range(1, len(times) - 1)]
+ assert len(deltas) == 3
+ want = 0.1
+ for delta in deltas:
+ assert delta == pytest.approx(want, 0.05), deltas
+ want *= 2
+
+
+@pytest.mark.slow
+@pytest.mark.timing
+def test_reconnect_failure(proxy):
+ proxy.start()
+
+ t1 = None
+
+ def failed(pool):
+ assert pool.name == "this-one"
+ nonlocal t1
+ t1 = time()
+
+ with pool.ConnectionPool(
+ proxy.client_dsn,
+ name="this-one",
+ min_size=1,
+ reconnect_timeout=1.0,
+ reconnect_failed=failed,
+ ) as p:
+ p.wait(2.0)
+ proxy.stop()
+
+ with pytest.raises(psycopg.OperationalError):
+ with p.connection() as conn:
+ conn.execute("select 1")
+
+ t0 = time()
+ sleep(1.5)
+ assert t1
+ assert t1 - t0 == pytest.approx(1.0, 0.1)
+ assert p._nconns == 0
+
+ proxy.start()
+ t0 = time()
+ with p.connection() as conn:
+ conn.execute("select 1")
+ t1 = time()
+ assert t1 - t0 < 0.2
+
+
+@pytest.mark.slow
+def test_reconnect_after_grow_failed(proxy):
+ # Retry reconnection after a failed connection attempt has put the pool
+ # in grow mode. See issue #370.
+ proxy.stop()
+
+ ev = Event()
+
+ def failed(pool):
+ ev.set()
+
+ with pool.ConnectionPool(
+ proxy.client_dsn, min_size=4, reconnect_timeout=1.0, reconnect_failed=failed
+ ) as p:
+ assert ev.wait(timeout=2)
+
+ with pytest.raises(pool.PoolTimeout):
+ with p.connection(timeout=0.5) as conn:
+ pass
+
+ ev.clear()
+ assert ev.wait(timeout=2)
+
+ proxy.start()
+
+ with p.connection(timeout=2) as conn:
+ conn.execute("select 1")
+
+ p.wait(timeout=3.0)
+ assert len(p._pool) == p.min_size == 4
+
+
+@pytest.mark.slow
+def test_refill_on_check(proxy):
+ proxy.start()
+ ev = Event()
+
+ def failed(pool):
+ ev.set()
+
+ with pool.ConnectionPool(
+ proxy.client_dsn, min_size=4, reconnect_timeout=1.0, reconnect_failed=failed
+ ) as p:
+ # The pool is full
+ p.wait(timeout=2)
+
+ # Break all the connection
+ proxy.stop()
+
+ # Checking the pool will empty it
+ p.check()
+ assert ev.wait(timeout=2)
+ assert len(p._pool) == 0
+
+ # Allow to connect again
+ proxy.start()
+
+ # Make sure that check has refilled the pool
+ p.check()
+ p.wait(timeout=2)
+ assert len(p._pool) == 4
+
+
+@pytest.mark.slow
+def test_uniform_use(dsn):
+ with pool.ConnectionPool(dsn, min_size=4) as p:
+ counts = Counter[int]()
+ for i in range(8):
+ with p.connection() as conn:
+ sleep(0.1)
+ counts[id(conn)] += 1
+
+ assert len(counts) == 4
+ assert set(counts.values()) == set([2])
+
+
+@pytest.mark.slow
+@pytest.mark.timing
+def test_resize(dsn):
+ def sampler():
+ sleep(0.05) # ensure sampling happens after shrink check
+ while True:
+ sleep(0.2)
+ if p.closed:
+ break
+ size.append(len(p._pool))
+
+ def client(t):
+ with p.connection() as conn:
+ conn.execute("select pg_sleep(%s)", [t])
+
+ size: List[int] = []
+
+ with pool.ConnectionPool(dsn, min_size=2, max_idle=0.2) as p:
+ s = Thread(target=sampler)
+ s.start()
+
+ sleep(0.3)
+ c = Thread(target=client, args=(0.4,))
+ c.start()
+
+ sleep(0.2)
+ p.resize(4)
+ assert p.min_size == 4
+ assert p.max_size == 4
+
+ sleep(0.4)
+ p.resize(2)
+ assert p.min_size == 2
+ assert p.max_size == 2
+
+ sleep(0.6)
+
+ s.join()
+ assert size == [2, 1, 3, 4, 3, 2, 2]
+
+
+@pytest.mark.parametrize("min_size, max_size", [(0, 0), (-1, None), (4, 2)])
+def test_bad_resize(dsn, min_size, max_size):
+ with pool.ConnectionPool() as p:
+ with pytest.raises(ValueError):
+ p.resize(min_size=min_size, max_size=max_size)
+
+
+def test_jitter():
+ rnds = [pool.ConnectionPool._jitter(30, -0.1, +0.2) for i in range(100)]
+ assert 27 <= min(rnds) <= 28
+ assert 35 < max(rnds) < 36
+
+
+@pytest.mark.slow
+@pytest.mark.timing
+@pytest.mark.crdb_skip("backend pid")
+def test_max_lifetime(dsn):
+ with pool.ConnectionPool(dsn, min_size=1, max_lifetime=0.2) as p:
+ sleep(0.1)
+ pids = []
+ for i in range(5):
+ with p.connection() as conn:
+ pids.append(conn.info.backend_pid)
+ sleep(0.2)
+
+ assert pids[0] == pids[1] != pids[4], pids
+
+
+@pytest.mark.crdb_skip("backend pid")
+def test_check(dsn, caplog):
+ caplog.set_level(logging.WARNING, logger="psycopg.pool")
+ with pool.ConnectionPool(dsn, min_size=4) as p:
+ p.wait(1.0)
+ with p.connection() as conn:
+ pid = conn.info.backend_pid
+
+ p.wait(1.0)
+ pids = set(conn.info.backend_pid for conn in p._pool)
+ assert pid in pids
+ conn.close()
+
+ assert len(caplog.records) == 0
+ p.check()
+ assert len(caplog.records) == 1
+ p.wait(1.0)
+ pids2 = set(conn.info.backend_pid for conn in p._pool)
+ assert len(pids & pids2) == 3
+ assert pid not in pids2
+
+
+def test_check_idle(dsn):
+ with pool.ConnectionPool(dsn, min_size=2) as p:
+ p.wait(1.0)
+ p.check()
+ with p.connection() as conn:
+ assert conn.info.transaction_status == TransactionStatus.IDLE
+
+
+@pytest.mark.slow
+@pytest.mark.timing
+def test_stats_measures(dsn):
+ def worker(n):
+ with p.connection() as conn:
+ conn.execute("select pg_sleep(0.2)")
+
+ with pool.ConnectionPool(dsn, min_size=2, max_size=4) as p:
+ p.wait(2.0)
+
+ stats = p.get_stats()
+ assert stats["pool_min"] == 2
+ assert stats["pool_max"] == 4
+ assert stats["pool_size"] == 2
+ assert stats["pool_available"] == 2
+ assert stats["requests_waiting"] == 0
+
+ ts = [Thread(target=worker, args=(i,)) for i in range(3)]
+ for t in ts:
+ t.start()
+ sleep(0.1)
+ stats = p.get_stats()
+ for t in ts:
+ t.join()
+ assert stats["pool_min"] == 2
+ assert stats["pool_max"] == 4
+ assert stats["pool_size"] == 3
+ assert stats["pool_available"] == 0
+ assert stats["requests_waiting"] == 0
+
+ p.wait(2.0)
+ ts = [Thread(target=worker, args=(i,)) for i in range(7)]
+ for t in ts:
+ t.start()
+ sleep(0.1)
+ stats = p.get_stats()
+ for t in ts:
+ t.join()
+ assert stats["pool_min"] == 2
+ assert stats["pool_max"] == 4
+ assert stats["pool_size"] == 4
+ assert stats["pool_available"] == 0
+ assert stats["requests_waiting"] == 3
+
+
+@pytest.mark.slow
+@pytest.mark.timing
+def test_stats_usage(dsn):
+ def worker(n):
+ try:
+ with p.connection(timeout=0.3) as conn:
+ conn.execute("select pg_sleep(0.2)")
+ except pool.PoolTimeout:
+ pass
+
+ with pool.ConnectionPool(dsn, min_size=3) as p:
+ p.wait(2.0)
+
+ ts = [Thread(target=worker, args=(i,)) for i in range(7)]
+ for t in ts:
+ t.start()
+ for t in ts:
+ t.join()
+ stats = p.get_stats()
+ assert stats["requests_num"] == 7
+ assert stats["requests_queued"] == 4
+ assert 850 <= stats["requests_wait_ms"] <= 950
+ assert stats["requests_errors"] == 1
+ assert 1150 <= stats["usage_ms"] <= 1250
+ assert stats.get("returns_bad", 0) == 0
+
+ with p.connection() as conn:
+ conn.close()
+ p.wait()
+ stats = p.pop_stats()
+ assert stats["requests_num"] == 8
+ assert stats["returns_bad"] == 1
+ with p.connection():
+ pass
+ assert p.get_stats()["requests_num"] == 1
+
+
+@pytest.mark.slow
+def test_stats_connect(dsn, proxy, monkeypatch):
+ proxy.start()
+ delay_connection(monkeypatch, 0.2)
+ with pool.ConnectionPool(proxy.client_dsn, min_size=3) as p:
+ p.wait()
+ stats = p.get_stats()
+ assert stats["connections_num"] == 3
+ assert stats.get("connections_errors", 0) == 0
+ assert stats.get("connections_lost", 0) == 0
+ assert 600 <= stats["connections_ms"] < 1200
+
+ proxy.stop()
+ p.check()
+ sleep(0.1)
+ stats = p.get_stats()
+ assert stats["connections_num"] > 3
+ assert stats["connections_errors"] > 0
+ assert stats["connections_lost"] == 3
+
+
+@pytest.mark.slow
+def test_spike(dsn, monkeypatch):
+ # Inspired to https://github.com/brettwooldridge/HikariCP/blob/dev/
+ # documents/Welcome-To-The-Jungle.md
+ delay_connection(monkeypatch, 0.15)
+
+ def worker():
+ with p.connection():
+ sleep(0.002)
+
+ with pool.ConnectionPool(dsn, min_size=5, max_size=10) as p:
+ p.wait()
+
+ ts = [Thread(target=worker) for i in range(50)]
+ for t in ts:
+ t.start()
+ for t in ts:
+ t.join()
+ p.wait()
+
+ assert len(p._pool) < 7
+
+
+def test_debug_deadlock(dsn):
+ # https://github.com/psycopg/psycopg/issues/230
+ logger = logging.getLogger("psycopg")
+ handler = logging.StreamHandler()
+ old_level = logger.level
+ logger.setLevel(logging.DEBUG)
+ handler.setLevel(logging.DEBUG)
+ logger.addHandler(handler)
+ try:
+ with pool.ConnectionPool(dsn, min_size=4, open=True) as p:
+ try:
+ p.wait(timeout=2)
+ finally:
+ print(p.get_stats())
+ finally:
+ logger.removeHandler(handler)
+ logger.setLevel(old_level)
+
+
+def delay_connection(monkeypatch, sec):
+ """
+ Return a _connect_gen function delayed by the amount of seconds
+ """
+
+ def connect_delay(*args, **kwargs):
+ t0 = time()
+ rv = connect_orig(*args, **kwargs)
+ t1 = time()
+ sleep(max(0, sec - (t1 - t0)))
+ return rv
+
+ connect_orig = psycopg.Connection.connect
+ monkeypatch.setattr(psycopg.Connection, "connect", connect_delay)
+
+
+def ensure_waiting(p, num=1):
+ """
+ Wait until there are at least *num* clients waiting in the queue.
+ """
+ while len(p._waiting) < num:
+ sleep(0)
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-21 11:27:09 +0000