mirror of
https://github.com/psycopg/psycopg2.git
synced 2024-11-23 01:16:34 +03:00
734845b79a
The new function keeps together PQconsumeInput() with PQisBusy(), in order to handle the condition in which not all the results of a sequence of statements arrive in the same roundtrip. Added pointer to a PGresult to the connection to keep the state across async communication: it can probably be used to simplify other code paths where a result is brought forward manually. Close #802 Close #855 Close #856
505 lines
16 KiB
Python
Executable File
505 lines
16 KiB
Python
Executable File
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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# test_async.py - unit test for asynchronous API
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#
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# Copyright (C) 2010-2019 Jan Urbański <wulczer@wulczer.org>
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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 gc
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import time
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import unittest
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import warnings
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import psycopg2
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import psycopg2.errors
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from psycopg2 import extensions as ext
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from .testutils import ConnectingTestCase, StringIO, skip_before_postgres, slow
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class PollableStub(object):
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"""A 'pollable' wrapper allowing analysis of the `poll()` calls."""
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def __init__(self, pollable):
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self.pollable = pollable
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self.polls = []
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def fileno(self):
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return self.pollable.fileno()
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def poll(self):
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rv = self.pollable.poll()
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self.polls.append(rv)
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return rv
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class AsyncTests(ConnectingTestCase):
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def setUp(self):
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ConnectingTestCase.setUp(self)
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self.sync_conn = self.conn
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self.conn = self.connect(async_=True)
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self.wait(self.conn)
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curs = self.conn.cursor()
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curs.execute('''
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CREATE TEMPORARY TABLE table1 (
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id int PRIMARY KEY
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)''')
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self.wait(curs)
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def test_connection_setup(self):
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cur = self.conn.cursor()
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sync_cur = self.sync_conn.cursor()
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del cur, sync_cur
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self.assert_(self.conn.async_)
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self.assert_(not self.sync_conn.async_)
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# the async connection should be autocommit
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self.assert_(self.conn.autocommit)
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self.assertEquals(self.conn.isolation_level, ext.ISOLATION_LEVEL_DEFAULT)
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# check other properties to be found on the connection
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self.assert_(self.conn.server_version)
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self.assert_(self.conn.protocol_version in (2, 3))
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self.assert_(self.conn.encoding in ext.encodings)
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def test_async_named_cursor(self):
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self.assertRaises(psycopg2.ProgrammingError,
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self.conn.cursor, "name")
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def test_async_select(self):
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cur = self.conn.cursor()
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self.assertFalse(self.conn.isexecuting())
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cur.execute("select 'a'")
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self.assertTrue(self.conn.isexecuting())
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self.wait(cur)
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self.assertFalse(self.conn.isexecuting())
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self.assertEquals(cur.fetchone()[0], "a")
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@slow
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@skip_before_postgres(8, 2)
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def test_async_callproc(self):
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cur = self.conn.cursor()
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cur.callproc("pg_sleep", (0.1, ))
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self.assertTrue(self.conn.isexecuting())
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self.wait(cur)
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self.assertFalse(self.conn.isexecuting())
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self.assertEquals(cur.fetchall()[0][0], '')
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@slow
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def test_async_after_async(self):
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cur = self.conn.cursor()
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cur2 = self.conn.cursor()
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del cur2
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cur.execute("insert into table1 values (1)")
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# an async execute after an async one raises an exception
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self.assertRaises(psycopg2.ProgrammingError,
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cur.execute, "select * from table1")
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# same for callproc
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self.assertRaises(psycopg2.ProgrammingError,
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cur.callproc, "version")
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# but after you've waited it should be good
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self.wait(cur)
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cur.execute("select * from table1")
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self.wait(cur)
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self.assertEquals(cur.fetchall()[0][0], 1)
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cur.execute("delete from table1")
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self.wait(cur)
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cur.execute("select * from table1")
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self.wait(cur)
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self.assertEquals(cur.fetchone(), None)
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def test_fetch_after_async(self):
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cur = self.conn.cursor()
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cur.execute("select 'a'")
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# a fetch after an asynchronous query should raise an error
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self.assertRaises(psycopg2.ProgrammingError,
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cur.fetchall)
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# but after waiting it should work
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self.wait(cur)
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self.assertEquals(cur.fetchall()[0][0], "a")
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def test_rollback_while_async(self):
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cur = self.conn.cursor()
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cur.execute("select 'a'")
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# a rollback should not work in asynchronous mode
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self.assertRaises(psycopg2.ProgrammingError, self.conn.rollback)
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def test_commit_while_async(self):
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cur = self.conn.cursor()
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cur.execute("begin")
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self.wait(cur)
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cur.execute("insert into table1 values (1)")
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# a commit should not work in asynchronous mode
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self.assertRaises(psycopg2.ProgrammingError, self.conn.commit)
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self.assertTrue(self.conn.isexecuting())
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# but a manual commit should
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self.wait(cur)
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cur.execute("commit")
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self.wait(cur)
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cur.execute("select * from table1")
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self.wait(cur)
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self.assertEquals(cur.fetchall()[0][0], 1)
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cur.execute("delete from table1")
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self.wait(cur)
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cur.execute("select * from table1")
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self.wait(cur)
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self.assertEquals(cur.fetchone(), None)
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def test_set_parameters_while_async(self):
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cur = self.conn.cursor()
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cur.execute("select 'c'")
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self.assertTrue(self.conn.isexecuting())
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# getting transaction status works
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self.assertEquals(self.conn.info.transaction_status,
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ext.TRANSACTION_STATUS_ACTIVE)
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self.assertTrue(self.conn.isexecuting())
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# setting connection encoding should fail
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self.assertRaises(psycopg2.ProgrammingError,
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self.conn.set_client_encoding, "LATIN1")
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# same for transaction isolation
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self.assertRaises(psycopg2.ProgrammingError,
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self.conn.set_isolation_level, 1)
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def test_reset_while_async(self):
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cur = self.conn.cursor()
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cur.execute("select 'c'")
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self.assertTrue(self.conn.isexecuting())
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# a reset should fail
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self.assertRaises(psycopg2.ProgrammingError, self.conn.reset)
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def test_async_iter(self):
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cur = self.conn.cursor()
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cur.execute("begin")
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self.wait(cur)
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cur.execute("""
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insert into table1 values (1);
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insert into table1 values (2);
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insert into table1 values (3);
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""")
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self.wait(cur)
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cur.execute("select id from table1 order by id")
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# iteration fails if a query is underway
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self.assertRaises(psycopg2.ProgrammingError, list, cur)
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# but after it's done it should work
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self.wait(cur)
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self.assertEquals(list(cur), [(1, ), (2, ), (3, )])
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self.assertFalse(self.conn.isexecuting())
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def test_copy_while_async(self):
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cur = self.conn.cursor()
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cur.execute("select 'a'")
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# copy should fail
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self.assertRaises(psycopg2.ProgrammingError,
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cur.copy_from,
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StringIO("1\n3\n5\n\\.\n"), "table1")
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def test_lobject_while_async(self):
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# large objects should be prohibited
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self.assertRaises(psycopg2.ProgrammingError,
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self.conn.lobject)
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def test_async_executemany(self):
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cur = self.conn.cursor()
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self.assertRaises(
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psycopg2.ProgrammingError,
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cur.executemany, "insert into table1 values (%s)", [1, 2, 3])
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def test_async_scroll(self):
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cur = self.conn.cursor()
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cur.execute("""
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insert into table1 values (1);
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insert into table1 values (2);
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insert into table1 values (3);
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""")
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self.wait(cur)
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cur.execute("select id from table1 order by id")
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# scroll should fail if a query is underway
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self.assertRaises(psycopg2.ProgrammingError, cur.scroll, 1)
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self.assertTrue(self.conn.isexecuting())
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# but after it's done it should work
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self.wait(cur)
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cur.scroll(1)
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self.assertEquals(cur.fetchall(), [(2, ), (3, )])
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cur = self.conn.cursor()
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cur.execute("select id from table1 order by id")
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self.wait(cur)
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cur2 = self.conn.cursor()
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self.assertRaises(psycopg2.ProgrammingError, cur2.scroll, 1)
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self.assertRaises(psycopg2.ProgrammingError, cur.scroll, 4)
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cur = self.conn.cursor()
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cur.execute("select id from table1 order by id")
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self.wait(cur)
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cur.scroll(2)
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cur.scroll(-1)
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self.assertEquals(cur.fetchall(), [(2, ), (3, )])
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def test_scroll(self):
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cur = self.sync_conn.cursor()
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cur.execute("create table table1 (id int)")
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cur.execute("""
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insert into table1 values (1);
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insert into table1 values (2);
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insert into table1 values (3);
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""")
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cur.execute("select id from table1 order by id")
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cur.scroll(2)
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cur.scroll(-1)
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self.assertEquals(cur.fetchall(), [(2, ), (3, )])
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def test_async_dont_read_all(self):
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cur = self.conn.cursor()
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cur.execute("select repeat('a', 10000); select repeat('b', 10000)")
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# fetch the result
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self.wait(cur)
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# it should be the result of the second query
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self.assertEquals(cur.fetchone()[0], "b" * 10000)
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def test_async_subclass(self):
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class MyConn(ext.connection):
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def __init__(self, dsn, async_=0):
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ext.connection.__init__(self, dsn, async_=async_)
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conn = self.connect(connection_factory=MyConn, async_=True)
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self.assert_(isinstance(conn, MyConn))
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self.assert_(conn.async_)
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conn.close()
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@slow
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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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curs = self.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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stub = PollableStub(self.conn)
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curs.execute("select %s;", ('x' * size,))
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self.wait(stub)
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self.assertEqual(size, len(curs.fetchone()[0]))
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if stub.polls.count(ext.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_sync_poll(self):
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cur = self.sync_conn.cursor()
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cur.execute("select 1")
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# polling with a sync query works
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cur.connection.poll()
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self.assertEquals(cur.fetchone()[0], 1)
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def test_notify(self):
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cur = self.conn.cursor()
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sync_cur = self.sync_conn.cursor()
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sync_cur.execute("listen test_notify")
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self.sync_conn.commit()
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cur.execute("notify test_notify")
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self.wait(cur)
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self.assertEquals(self.sync_conn.notifies, [])
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pid = self.conn.info.backend_pid
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for _ in range(5):
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self.wait(self.sync_conn)
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if not self.sync_conn.notifies:
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time.sleep(0.5)
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continue
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self.assertEquals(len(self.sync_conn.notifies), 1)
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self.assertEquals(self.sync_conn.notifies.pop(),
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(pid, "test_notify"))
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return
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self.fail("No NOTIFY in 2.5 seconds")
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def test_async_fetch_wrong_cursor(self):
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cur1 = self.conn.cursor()
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cur2 = self.conn.cursor()
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cur1.execute("select 1")
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self.wait(cur1)
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self.assertFalse(self.conn.isexecuting())
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# fetching from a cursor with no results is an error
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self.assertRaises(psycopg2.ProgrammingError, cur2.fetchone)
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# fetching from the correct cursor works
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self.assertEquals(cur1.fetchone()[0], 1)
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def test_error(self):
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cur = self.conn.cursor()
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cur.execute("insert into table1 values (%s)", (1, ))
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self.wait(cur)
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cur.execute("insert into table1 values (%s)", (1, ))
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# this should fail
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self.assertRaises(psycopg2.IntegrityError, self.wait, cur)
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cur.execute("insert into table1 values (%s); "
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"insert into table1 values (%s)", (2, 2))
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# this should fail as well
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self.assertRaises(psycopg2.IntegrityError, self.wait, cur)
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# but this should work
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cur.execute("insert into table1 values (%s)", (2, ))
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self.wait(cur)
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# and the cursor should be usable afterwards
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cur.execute("insert into table1 values (%s)", (3, ))
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self.wait(cur)
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cur.execute("select * from table1 order by id")
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self.wait(cur)
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self.assertEquals(cur.fetchall(), [(1, ), (2, ), (3, )])
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cur.execute("delete from table1")
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self.wait(cur)
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def test_stop_on_first_error(self):
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cur = self.conn.cursor()
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cur.execute("select 1; select x; select 1/0; select 2")
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self.assertRaises(psycopg2.errors.UndefinedColumn, self.wait, cur)
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cur.execute("select 1")
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self.wait(cur)
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self.assertEqual(cur.fetchone(), (1,))
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def test_error_two_cursors(self):
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cur = self.conn.cursor()
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cur2 = self.conn.cursor()
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cur.execute("select * from no_such_table")
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self.assertRaises(psycopg2.ProgrammingError, self.wait, cur)
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cur2.execute("select 1")
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self.wait(cur2)
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self.assertEquals(cur2.fetchone()[0], 1)
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def test_notices(self):
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del self.conn.notices[:]
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cur = self.conn.cursor()
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if self.conn.info.server_version >= 90300:
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cur.execute("set client_min_messages=debug1")
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self.wait(cur)
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cur.execute("create temp table chatty (id serial primary key);")
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self.wait(cur)
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self.assertEqual("CREATE TABLE", cur.statusmessage)
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self.assert_(self.conn.notices)
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def test_async_cursor_gone(self):
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cur = self.conn.cursor()
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cur.execute("select 42;")
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del cur
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gc.collect()
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self.assertRaises(psycopg2.InterfaceError, self.wait, self.conn)
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# The connection is still usable
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cur = self.conn.cursor()
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cur.execute("select 42;")
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self.wait(self.conn)
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self.assertEqual(cur.fetchone(), (42,))
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def test_async_connection_error_message(self):
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try:
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cnn = psycopg2.connect('dbname=thisdatabasedoesntexist', async_=True)
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self.wait(cnn)
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except psycopg2.Error as e:
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self.assertNotEqual(str(e), "asynchronous connection failed",
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"connection error reason lost")
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else:
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self.fail("no exception raised")
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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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cur.execute("copy (select 1) to stdout")
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self.assertRaises(psycopg2.ProgrammingError, self.wait, self.conn)
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@slow
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@skip_before_postgres(9, 0)
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def test_non_block_after_notification(self):
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from select import select
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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 = 0
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while True:
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state = self.conn.poll()
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if state == psycopg2.extensions.POLL_OK:
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break
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elif state == psycopg2.extensions.POLL_READ:
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select([self.conn], [], [], 0.1)
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elif state == psycopg2.extensions.POLL_WRITE:
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select([], [self.conn], [], 0.1)
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else:
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raise Exception("Unexpected result from poll: %r", state)
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polls += 1
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self.assert_(polls >= 8, polls)
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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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