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232 lines
7.7 KiB
Python
Executable File
232 lines
7.7 KiB
Python
Executable File
#!/usr/bin/env python
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# test_notify.py - unit test for async notifications
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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 unittest
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from collections import deque
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import psycopg2
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from psycopg2 import extensions
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from psycopg2.extensions import Notify
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from .testutils import ConnectingTestCase, skip_if_crdb, slow
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from .testconfig import dsn
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import sys
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import time
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import select
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from subprocess import Popen, PIPE
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@skip_if_crdb("notify")
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class NotifiesTests(ConnectingTestCase):
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def autocommit(self, conn):
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"""Set a connection in autocommit mode."""
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conn.set_isolation_level(extensions.ISOLATION_LEVEL_AUTOCOMMIT)
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def listen(self, name):
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"""Start listening for a name on self.conn."""
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curs = self.conn.cursor()
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curs.execute("LISTEN " + name)
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curs.close()
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def notify(self, name, sec=0, payload=None):
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"""Send a notification to the database, eventually after some time."""
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if payload is None:
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payload = ''
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else:
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payload = f", {payload!r}"
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script = ("""\
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import time
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time.sleep({sec})
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import {module} as psycopg2
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import {module}.extensions as ext
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conn = psycopg2.connect({dsn!r})
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conn.set_isolation_level(ext.ISOLATION_LEVEL_AUTOCOMMIT)
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print(conn.info.backend_pid)
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curs = conn.cursor()
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curs.execute("NOTIFY " {name!r} {payload!r})
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curs.close()
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conn.close()
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""".format(
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module=psycopg2.__name__,
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dsn=dsn, sec=sec, name=name, payload=payload))
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return Popen([sys.executable, '-c', script], stdout=PIPE)
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@slow
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def test_notifies_received_on_poll(self):
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self.autocommit(self.conn)
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self.listen('foo')
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proc = self.notify('foo', 1)
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t0 = time.time()
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select.select([self.conn], [], [], 5)
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t1 = time.time()
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self.assert_(0.99 < t1 - t0 < 4, t1 - t0)
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pid = int(proc.communicate()[0])
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self.assertEqual(0, len(self.conn.notifies))
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self.assertEqual(extensions.POLL_OK, self.conn.poll())
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self.assertEqual(1, len(self.conn.notifies))
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self.assertEqual(pid, self.conn.notifies[0][0])
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self.assertEqual('foo', self.conn.notifies[0][1])
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@slow
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def test_many_notifies(self):
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self.autocommit(self.conn)
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for name in ['foo', 'bar', 'baz']:
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self.listen(name)
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pids = {}
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for name in ['foo', 'bar', 'baz', 'qux']:
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pids[name] = int(self.notify(name).communicate()[0])
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self.assertEqual(0, len(self.conn.notifies))
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for i in range(10):
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self.assertEqual(extensions.POLL_OK, self.conn.poll())
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self.assertEqual(3, len(self.conn.notifies))
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names = dict.fromkeys(['foo', 'bar', 'baz'])
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for (pid, name) in self.conn.notifies:
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self.assertEqual(pids[name], pid)
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names.pop(name) # raise if name found twice
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@slow
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def test_notifies_received_on_execute(self):
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self.autocommit(self.conn)
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self.listen('foo')
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pid = int(self.notify('foo').communicate()[0])
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self.assertEqual(0, len(self.conn.notifies))
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self.conn.cursor().execute('select 1;')
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self.assertEqual(1, len(self.conn.notifies))
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self.assertEqual(pid, self.conn.notifies[0][0])
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self.assertEqual('foo', self.conn.notifies[0][1])
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@slow
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def test_notify_object(self):
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self.autocommit(self.conn)
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self.listen('foo')
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self.notify('foo').communicate()
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time.sleep(0.5)
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self.conn.poll()
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notify = self.conn.notifies[0]
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self.assert_(isinstance(notify, psycopg2.extensions.Notify))
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@slow
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def test_notify_attributes(self):
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self.autocommit(self.conn)
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self.listen('foo')
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pid = int(self.notify('foo').communicate()[0])
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time.sleep(0.5)
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self.conn.poll()
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self.assertEqual(1, len(self.conn.notifies))
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notify = self.conn.notifies[0]
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self.assertEqual(pid, notify.pid)
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self.assertEqual('foo', notify.channel)
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self.assertEqual('', notify.payload)
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@slow
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def test_notify_payload(self):
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if self.conn.info.server_version < 90000:
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return self.skipTest("server version %s doesn't support notify payload"
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% self.conn.info.server_version)
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self.autocommit(self.conn)
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self.listen('foo')
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pid = int(self.notify('foo', payload="Hello, world!").communicate()[0])
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time.sleep(0.5)
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self.conn.poll()
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self.assertEqual(1, len(self.conn.notifies))
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notify = self.conn.notifies[0]
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self.assertEqual(pid, notify.pid)
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self.assertEqual('foo', notify.channel)
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self.assertEqual('Hello, world!', notify.payload)
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@slow
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def test_notify_deque(self):
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self.autocommit(self.conn)
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self.conn.notifies = deque()
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self.listen('foo')
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self.notify('foo').communicate()
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time.sleep(0.5)
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self.conn.poll()
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notify = self.conn.notifies.popleft()
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self.assert_(isinstance(notify, psycopg2.extensions.Notify))
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self.assertEqual(len(self.conn.notifies), 0)
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@slow
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def test_notify_noappend(self):
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self.autocommit(self.conn)
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self.conn.notifies = None
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self.listen('foo')
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self.notify('foo').communicate()
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time.sleep(0.5)
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self.conn.poll()
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self.assertEqual(self.conn.notifies, None)
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def test_notify_init(self):
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n = psycopg2.extensions.Notify(10, 'foo')
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self.assertEqual(10, n.pid)
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self.assertEqual('foo', n.channel)
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self.assertEqual('', n.payload)
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(pid, channel) = n
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self.assertEqual((pid, channel), (10, 'foo'))
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n = psycopg2.extensions.Notify(42, 'bar', 'baz')
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self.assertEqual(42, n.pid)
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self.assertEqual('bar', n.channel)
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self.assertEqual('baz', n.payload)
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(pid, channel) = n
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self.assertEqual((pid, channel), (42, 'bar'))
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def test_compare(self):
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data = [(10, 'foo'), (20, 'foo'), (10, 'foo', 'bar'), (10, 'foo', 'baz')]
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for d1 in data:
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for d2 in data:
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n1 = psycopg2.extensions.Notify(*d1)
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n2 = psycopg2.extensions.Notify(*d2)
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self.assertEqual((n1 == n2), (d1 == d2))
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self.assertEqual((n1 != n2), (d1 != d2))
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def test_compare_tuple(self):
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self.assertEqual((10, 'foo'), Notify(10, 'foo'))
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self.assertEqual((10, 'foo'), Notify(10, 'foo', 'bar'))
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self.assertNotEqual((10, 'foo'), Notify(20, 'foo'))
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self.assertNotEqual((10, 'foo'), Notify(10, 'bar'))
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def test_hash(self):
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self.assertEqual(hash((10, 'foo')), hash(Notify(10, 'foo')))
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self.assertNotEqual(hash(Notify(10, 'foo', 'bar')),
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hash(Notify(10, 'foo')))
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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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