/usr/lib/python3/dist-packages/psycopg2/tests/test_green.py is in python3-psycopg2 2.7.4-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 | #!/usr/bin/env python
# test_green.py - unit test for async wait callback
#
# Copyright (C) 2010-2011 Daniele Varrazzo <daniele.varrazzo@gmail.com>
#
# psycopg2 is free software: you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published
# by the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# In addition, as a special exception, the copyright holders give
# permission to link this program with the OpenSSL library (or with
# modified versions of OpenSSL that use the same license as OpenSSL),
# and distribute linked combinations including the two.
#
# You must obey the GNU Lesser General Public License in all respects for
# all of the code used other than OpenSSL.
#
# psycopg2 is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
# License for more details.
import unittest
import psycopg2
import psycopg2.extensions
import psycopg2.extras
from .testutils import ConnectingTestCase, slow
class ConnectionStub(object):
"""A `connection` wrapper allowing analysis of the `poll()` calls."""
def __init__(self, conn):
self.conn = conn
self.polls = []
def fileno(self):
return self.conn.fileno()
def poll(self):
rv = self.conn.poll()
self.polls.append(rv)
return rv
class GreenTestCase(ConnectingTestCase):
def setUp(self):
self._cb = psycopg2.extensions.get_wait_callback()
psycopg2.extensions.set_wait_callback(psycopg2.extras.wait_select)
ConnectingTestCase.setUp(self)
def tearDown(self):
ConnectingTestCase.tearDown(self)
psycopg2.extensions.set_wait_callback(self._cb)
def set_stub_wait_callback(self, conn):
stub = ConnectionStub(conn)
psycopg2.extensions.set_wait_callback(
lambda conn: psycopg2.extras.wait_select(stub))
return stub
@slow
def test_flush_on_write(self):
# a very large query requires a flush loop to be sent to the backend
conn = self.conn
stub = self.set_stub_wait_callback(conn)
curs = conn.cursor()
for mb in 1, 5, 10, 20, 50:
size = mb * 1024 * 1024
del stub.polls[:]
curs.execute("select %s;", ('x' * size,))
self.assertEqual(size, len(curs.fetchone()[0]))
if stub.polls.count(psycopg2.extensions.POLL_WRITE) > 1:
return
# This is more a testing glitch than an error: it happens
# on high load on linux: probably because the kernel has more
# buffers ready. A warning may be useful during development,
# but an error is bad during regression testing.
import warnings
warnings.warn("sending a large query didn't trigger block on write.")
def test_error_in_callback(self):
# behaviour changed after issue #113: if there is an error in the
# callback for the moment we don't have a way to reset the connection
# without blocking (ticket #113) so just close it.
conn = self.conn
curs = conn.cursor()
curs.execute("select 1") # have a BEGIN
curs.fetchone()
# now try to do something that will fail in the callback
psycopg2.extensions.set_wait_callback(lambda conn: 1 // 0)
self.assertRaises(ZeroDivisionError, curs.execute, "select 2")
self.assertTrue(conn.closed)
def test_dont_freak_out(self):
# if there is an error in a green query, don't freak out and close
# the connection
conn = self.conn
curs = conn.cursor()
self.assertRaises(psycopg2.ProgrammingError,
curs.execute, "select the unselectable")
# check that the connection is left in an usable state
self.assertTrue(not conn.closed)
conn.rollback()
curs.execute("select 1")
self.assertEqual(curs.fetchone()[0], 1)
class CallbackErrorTestCase(ConnectingTestCase):
def setUp(self):
self._cb = psycopg2.extensions.get_wait_callback()
psycopg2.extensions.set_wait_callback(self.crappy_callback)
ConnectingTestCase.setUp(self)
self.to_error = None
def tearDown(self):
ConnectingTestCase.tearDown(self)
psycopg2.extensions.set_wait_callback(self._cb)
def crappy_callback(self, conn):
"""green callback failing after `self.to_error` time it is called"""
import select
from psycopg2.extensions import POLL_OK, POLL_READ, POLL_WRITE
while 1:
if self.to_error is not None:
self.to_error -= 1
if self.to_error <= 0:
raise ZeroDivisionError("I accidentally the connection")
try:
state = conn.poll()
if state == POLL_OK:
break
elif state == POLL_READ:
select.select([conn.fileno()], [], [])
elif state == POLL_WRITE:
select.select([], [conn.fileno()], [])
else:
raise conn.OperationalError("bad state from poll: %s" % state)
except KeyboardInterrupt:
conn.cancel()
# the loop will be broken by a server error
continue
def test_errors_on_connection(self):
# Test error propagation in the different stages of the connection
for i in range(100):
self.to_error = i
try:
self.connect()
except ZeroDivisionError:
pass
else:
# We managed to connect
return
self.fail("you should have had a success or an error by now")
def test_errors_on_query(self):
for i in range(100):
self.to_error = None
cnn = self.connect()
cur = cnn.cursor()
self.to_error = i
try:
cur.execute("select 1")
cur.fetchone()
except ZeroDivisionError:
pass
else:
# The query completed
return
self.fail("you should have had a success or an error by now")
def test_errors_named_cursor(self):
for i in range(100):
self.to_error = None
cnn = self.connect()
cur = cnn.cursor('foo')
self.to_error = i
try:
cur.execute("select 1")
cur.fetchone()
except ZeroDivisionError:
pass
else:
# The query completed
return
self.fail("you should have had a success or an error by now")
def test_suite():
return unittest.TestLoader().loadTestsFromName(__name__)
if __name__ == "__main__":
unittest.main()
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