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import os
import sys
import threading
import time
import unittest
from functools import partial
try:
import gevent
from gevent.event import Event as GreenEvent
except ImportError:
gevent = None
from peewee import *
from playhouse.sqliteq import ResultTimeout
from playhouse.sqliteq import SqliteQueueDatabase
from playhouse.sqliteq import WriterPaused
from .base import BaseTestCase
from .base import TestModel
from .base import db_loader
from .base import skip_if
get_db = partial(db_loader, 'sqlite', db_class=SqliteQueueDatabase)
db = db_loader('sqlite')
class User(TestModel):
name = TextField(unique=True)
class Meta:
table_name = 'threaded_db_test_user'
class BaseTestQueueDatabase(object):
database_config = {}
n_rows = 20
n_threads = 20
def setUp(self):
super(BaseTestQueueDatabase, self).setUp()
User._meta.database = db
with db:
db.create_tables([User], safe=True)
User._meta.database = \
self.database = get_db(**self.database_config)
# Sanity check at startup.
self.assertEqual(self.database.queue_size(), 0)
def tearDown(self):
super(BaseTestQueueDatabase, self).tearDown()
User._meta.database = db
with db:
User.drop_table()
if not self.database.is_closed():
self.database.close()
if not db.is_closed():
db.close()
filename = db.database
if os.path.exists(filename):
os.unlink(filename)
def test_query_error(self):
self.database.start()
curs = self.database.execute_sql('foo bar baz')
self.assertRaises(OperationalError, curs.fetchone)
self.database.stop()
def test_integrity_error(self):
self.database.start()
u = User.create(name='u')
self.assertRaises(IntegrityError, User.create, name='u')
def test_query_execution(self):
qr = User.select().execute()
self.assertEqual(self.database.queue_size(), 0)
self.database.start()
try:
users = list(qr)
huey = User.create(name='huey')
mickey = User.create(name='mickey')
self.assertTrue(huey.id is not None)
self.assertTrue(mickey.id is not None)
self.assertEqual(self.database.queue_size(), 0)
finally:
self.database.stop()
def create_thread(self, fn, *args):
raise NotImplementedError
def create_event(self):
raise NotImplementedError
def test_multiple_threads(self):
def create_rows(idx, nrows):
for i in range(idx, idx + nrows):
User.create(name='u-%s' % i)
total = self.n_threads * self.n_rows
self.database.start()
threads = [self.create_thread(create_rows, i, self.n_rows)
for i in range(0, total, self.n_rows)]
[t.start() for t in threads]
[t.join() for t in threads]
self.assertEqual(User.select().count(), total)
self.database.stop()
def test_pause(self):
event_a = self.create_event()
event_b = self.create_event()
def create_user(name, event, expect_paused):
event.wait()
if expect_paused:
self.assertRaises(WriterPaused, lambda: User.create(name=name))
else:
User.create(name=name)
self.database.start()
t_a = self.create_thread(create_user, 'a', event_a, True)
t_a.start()
t_b = self.create_thread(create_user, 'b', event_b, False)
t_b.start()
User.create(name='c')
self.assertEqual(User.select().count(), 1)
# Pause operations but preserve the writer thread/connection.
self.database.pause()
event_a.set()
self.assertEqual(User.select().count(), 1)
t_a.join()
self.database.unpause()
self.assertEqual(User.select().count(), 1)
event_b.set()
t_b.join()
self.assertEqual(User.select().count(), 2)
self.database.stop()
def test_restart(self):
self.database.start()
User.create(name='a')
self.database.stop()
self.database._results_timeout = 0.0001
self.assertRaises(ResultTimeout, User.create, name='b')
self.assertEqual(User.select().count(), 1)
self.database.start() # Will execute the pending "b" INSERT.
self.database._results_timeout = None
User.create(name='c')
self.assertEqual(User.select().count(), 3)
self.assertEqual(sorted(u.name for u in User.select()),
['a', 'b', 'c'])
def test_waiting(self):
D = {}
def create_user(name):
D[name] = User.create(name=name).id
threads = [self.create_thread(create_user, name)
for name in ('huey', 'charlie', 'zaizee')]
[t.start() for t in threads]
def get_users():
D['users'] = [(user.id, user.name) for user in User.select()]
tg = self.create_thread(get_users)
tg.start()
threads.append(tg)
self.database.start()
[t.join() for t in threads]
self.database.stop()
self.assertEqual(sorted(D), ['charlie', 'huey', 'users', 'zaizee'])
def test_next_method(self):
self.database.start()
User.create(name='mickey')
User.create(name='huey')
query = iter(User.select().order_by(User.name))
self.assertEqual(next(query).name, 'huey')
self.assertEqual(next(query).name, 'mickey')
self.assertRaises(StopIteration, lambda: next(query))
self.assertEqual(
next(self.database.execute_sql('PRAGMA journal_mode'))[0],
'wal')
self.database.stop()
class TestThreadedDatabaseThreads(BaseTestQueueDatabase, BaseTestCase):
database_config = {'use_gevent': False}
def tearDown(self):
self.database._results_timeout = None
super(TestThreadedDatabaseThreads, self).tearDown()
def create_thread(self, fn, *args):
t = threading.Thread(target=fn, args=args)
t.daemon = True
return t
def create_event(self):
return threading.Event()
def test_timeout(self):
@self.database.func()
def slow(n):
time.sleep(n)
return 'slept %0.2f' % n
self.database.start()
# Make the result timeout very small, then call our function which
# will cause the query results to time-out.
self.database._results_timeout = 0.001
def do_query():
cursor = self.database.execute_sql('select slow(?)', (0.01,),
commit=True)
self.assertEqual(cursor.fetchone()[0], 'slept 0.01')
self.assertRaises(ResultTimeout, do_query)
self.database.stop()
@skip_if(gevent is None, 'gevent not installed')
class TestThreadedDatabaseGreenlets(BaseTestQueueDatabase, BaseTestCase):
database_config = {'use_gevent': True}
n_rows = 10
n_threads = 40
def create_thread(self, fn, *args):
return gevent.Greenlet(fn, *args)
def create_event(self):
return GreenEvent()
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