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https://github.com/psycopg/psycopg2.git
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247 lines
8.2 KiB
Python
Executable File
247 lines
8.2 KiB
Python
Executable File
#!/usr/bin/env python
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# test_green.py - unit test for async wait callback
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#
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# Copyright (C) 2010-2019 Daniele Varrazzo <daniele.varrazzo@gmail.com>
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# Copyright (C) 2020-2021 The Psycopg Team
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#
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# psycopg2 is free software: you can redistribute it and/or modify it
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# under the terms of the GNU Lesser General Public License as published
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# by the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# In addition, as a special exception, the copyright holders give
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# permission to link this program with the OpenSSL library (or with
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# modified versions of OpenSSL that use the same license as OpenSSL),
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# and distribute linked combinations including the two.
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#
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# You must obey the GNU Lesser General Public License in all respects for
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# all of the code used other than OpenSSL.
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#
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# psycopg2 is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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# License for more details.
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import select
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import unittest
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import warnings
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import psycopg2
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import psycopg2.extensions
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import psycopg2.extras
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from psycopg2.extensions import POLL_OK, POLL_READ, POLL_WRITE
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from .testutils import ConnectingTestCase, skip_before_postgres, slow
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from .testutils import skip_if_crdb
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class ConnectionStub:
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"""A `connection` wrapper allowing analysis of the `poll()` calls."""
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def __init__(self, conn):
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self.conn = conn
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self.polls = []
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def fileno(self):
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return self.conn.fileno()
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def poll(self):
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rv = self.conn.poll()
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self.polls.append(rv)
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return rv
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class GreenTestCase(ConnectingTestCase):
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def setUp(self):
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self._cb = psycopg2.extensions.get_wait_callback()
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psycopg2.extensions.set_wait_callback(psycopg2.extras.wait_select)
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ConnectingTestCase.setUp(self)
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def tearDown(self):
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ConnectingTestCase.tearDown(self)
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psycopg2.extensions.set_wait_callback(self._cb)
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def set_stub_wait_callback(self, conn, cb=None):
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stub = ConnectionStub(conn)
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psycopg2.extensions.set_wait_callback(
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lambda conn: (cb or psycopg2.extras.wait_select)(stub))
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return stub
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@slow
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@skip_if_crdb("flush on write flakey")
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def test_flush_on_write(self):
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# a very large query requires a flush loop to be sent to the backend
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conn = self.conn
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stub = self.set_stub_wait_callback(conn)
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curs = conn.cursor()
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for mb in 1, 5, 10, 20, 50:
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size = mb * 1024 * 1024
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del stub.polls[:]
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curs.execute("select %s;", ('x' * size,))
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self.assertEqual(size, len(curs.fetchone()[0]))
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if stub.polls.count(psycopg2.extensions.POLL_WRITE) > 1:
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return
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# This is more a testing glitch than an error: it happens
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# on high load on linux: probably because the kernel has more
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# buffers ready. A warning may be useful during development,
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# but an error is bad during regression testing.
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warnings.warn("sending a large query didn't trigger block on write.")
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def test_error_in_callback(self):
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# behaviour changed after issue #113: if there is an error in the
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# callback for the moment we don't have a way to reset the connection
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# without blocking (ticket #113) so just close it.
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conn = self.conn
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curs = conn.cursor()
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curs.execute("select 1") # have a BEGIN
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curs.fetchone()
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# now try to do something that will fail in the callback
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psycopg2.extensions.set_wait_callback(lambda conn: 1 // 0)
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self.assertRaises(ZeroDivisionError, curs.execute, "select 2")
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self.assert_(conn.closed)
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def test_dont_freak_out(self):
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# if there is an error in a green query, don't freak out and close
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# the connection
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conn = self.conn
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curs = conn.cursor()
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self.assertRaises(psycopg2.ProgrammingError,
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curs.execute, "select the unselectable")
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# check that the connection is left in an usable state
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self.assert_(not conn.closed)
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conn.rollback()
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curs.execute("select 1")
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self.assertEqual(curs.fetchone()[0], 1)
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@skip_before_postgres(8, 2)
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def test_copy_no_hang(self):
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cur = self.conn.cursor()
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self.assertRaises(psycopg2.ProgrammingError,
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cur.execute, "copy (select 1) to stdout")
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@slow
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@skip_if_crdb("notice")
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@skip_before_postgres(9, 0)
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def test_non_block_after_notice(self):
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def wait(conn):
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while 1:
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state = conn.poll()
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if state == POLL_OK:
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break
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elif state == POLL_READ:
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select.select([conn.fileno()], [], [], 0.1)
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elif state == POLL_WRITE:
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select.select([], [conn.fileno()], [], 0.1)
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else:
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raise conn.OperationalError(f"bad state from poll: {state}")
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stub = self.set_stub_wait_callback(self.conn, wait)
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cur = self.conn.cursor()
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cur.execute("""
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select 1;
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do $$
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begin
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raise notice 'hello';
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end
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$$ language plpgsql;
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select pg_sleep(1);
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""")
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polls = stub.polls.count(POLL_READ)
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self.assert_(polls > 8, polls)
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class CallbackErrorTestCase(ConnectingTestCase):
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def setUp(self):
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self._cb = psycopg2.extensions.get_wait_callback()
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psycopg2.extensions.set_wait_callback(self.crappy_callback)
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ConnectingTestCase.setUp(self)
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self.to_error = None
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def tearDown(self):
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ConnectingTestCase.tearDown(self)
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psycopg2.extensions.set_wait_callback(self._cb)
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def crappy_callback(self, conn):
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"""green callback failing after `self.to_error` time it is called"""
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while True:
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if self.to_error is not None:
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self.to_error -= 1
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if self.to_error <= 0:
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raise ZeroDivisionError("I accidentally the connection")
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try:
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state = conn.poll()
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if state == POLL_OK:
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break
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elif state == POLL_READ:
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select.select([conn.fileno()], [], [])
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elif state == POLL_WRITE:
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select.select([], [conn.fileno()], [])
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else:
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raise conn.OperationalError(f"bad state from poll: {state}")
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except KeyboardInterrupt:
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conn.cancel()
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# the loop will be broken by a server error
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continue
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def test_errors_on_connection(self):
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# Test error propagation in the different stages of the connection
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for i in range(100):
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self.to_error = i
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try:
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self.connect()
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except ZeroDivisionError:
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pass
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else:
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# We managed to connect
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return
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self.fail("you should have had a success or an error by now")
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def test_errors_on_query(self):
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for i in range(100):
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self.to_error = None
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cnn = self.connect()
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cur = cnn.cursor()
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self.to_error = i
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try:
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cur.execute("select 1")
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cur.fetchone()
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except ZeroDivisionError:
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pass
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else:
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# The query completed
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return
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self.fail("you should have had a success or an error by now")
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@skip_if_crdb("named cursor", version="< 22.1")
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def test_errors_named_cursor(self):
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for i in range(100):
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self.to_error = None
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cnn = self.connect()
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cur = cnn.cursor('foo')
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self.to_error = i
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try:
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cur.execute("select 1")
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cur.fetchone()
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except ZeroDivisionError:
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pass
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else:
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# The query completed
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return
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self.fail("you should have had a success or an error by now")
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def test_suite():
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return unittest.TestLoader().loadTestsFromName(__name__)
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if __name__ == "__main__":
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unittest.main()
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