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# tests that db settings can be different in different threads
#
#
# What's going on here:
#
# Simulating multiple web requests in a threaded environment, one in
# which settings are different for each request. So we replace
# django.conf.settings with a thread local, with different
# configurations in each thread, and then fire off three
# simultaneous requests (using a condition to sync them up), and
# test that each thread sees its own settings and the models in each
# thread attempt to connect to the correct database as per their
# settings.
#
import copy
import os
import sys
import threading
import unittest
from thread import get_ident
from django.conf import settings, UserSettingsHolder
from django.core.handlers.wsgi import WSGIHandler
from django.db import model_connection_name, _default, connection, connections
from regressiontests.request_isolation.tests import MockHandler
from regressiontests.thread_isolation.models import *
try:
# Only exists in Python 2.4+
from threading import local
except ImportError:
# Import copy of _thread_local.py from Python 2.4
from django.utils._threading_local import local
# helpers
EV = threading.Event()
class LocalSettings:
"""Settings holder that allows thread-local overrides of defaults.
"""
def __init__(self, defaults):
self._defaults = defaults
self._local = local()
def __getattr__(self, attr):
if attr in ('_defaults', '_local'):
return self.__dict__[attr]
_local = self.__dict__['_local']
_defaults = self.__dict__['_defaults']
debug("LS get %s (%s)", attr, hasattr(_local, attr))
if not hasattr(_local, attr):
# Make sure everything we return is the local version; this
# avoids sets to deep datastructures overwriting the defaults
setattr(_local, attr, copy.deepcopy(getattr(_defaults, attr)))
return getattr(_local, attr)
def __setattr__(self, attr, val):
if attr in ('_defaults', '_local'):
self.__dict__[attr] = val
else:
debug("LS set local %s = %s", attr, val)
setattr(self.__dict__['_local'], attr, val)
def thread_two(func, *arg):
def start():
# from django.conf import settings
settings.OTHER_DATABASES['_b']['MODELS'] = []
debug("t2 ODB: %s", settings.OTHER_DATABASES)
debug("t2 waiting")
EV.wait(2.0)
func(*arg)
debug("t2 complete")
t2 = threading.Thread(target=start)
t2.start()
return t2
def thread_three(func, *arg):
def start():
# from django.conf import settings
settings.OTHER_DATABASES['_b']['MODELS'] = ['ti.MY']
settings.OTHER_DATABASES['_b'], \
settings.OTHER_DATABASES['_a'] = \
settings.OTHER_DATABASES['_a'], \
settings.OTHER_DATABASES['_b']
settings.DATABASE_NAME = \
settings.OTHER_DATABASES['_a']['DATABASE_NAME']
debug("t3 ODB: %s", settings.OTHER_DATABASES)
debug("3 %s: start: default: %s", get_ident(), settings.DATABASE_NAME)
debug("3 %s: start: conn: %s", get_ident(),
connection.settings.DATABASE_NAME)
debug("t3 waiting")
EV.wait(2.0)
func(*arg)
debug("t3 complete")
t3 = threading.Thread(target=start)
t3.start()
return t3
def debug(*arg):
pass
# msg, arg = arg[0], arg[1:]
# print msg % arg
def start_response(code, headers):
debug("start response: %s %s", code, headers)
pass
class TestThreadIsolation(unittest.TestCase):
# event used to synchronize threads so we can be sure they are running
# together
lock = threading.RLock()
errors = []
def setUp(self):
debug("setup")
self.settings = settings._target
settings._target = UserSettingsHolder(copy.deepcopy(settings._target))
settings.OTHER_DATABASES['_a']['MODELS'] = ['ti.MX']
settings.OTHER_DATABASES['_b']['MODELS'] = ['ti.MY']
# normal settings holders aren't thread-safe, so we need to substitute
# one that is (and so allows per-thread settings)
holder = settings._target
settings._target = LocalSettings(holder)
def teardown(self):
debug("teardown")
settings._target = self.settings
def add_thread_error(self, err):
self.lock.acquire()
try:
self.errors.append(err)
finally:
self.lock.release()
def thread_errors(self):
self.lock.acquire()
try:
return self.errors[:]
finally:
self.lock.release()
def request_one(self, path, request):
"""Start out with settings as originally configured"""
from django.conf import settings
debug("request_one: %s", settings.OTHER_DATABASES)
self.assertEqual(model_connection_name(MQ), _default)
self.assertEqual(model_connection_name(MX), '_a')
self.assertEqual(
MX._default_manager.db.connection.settings.DATABASE_NAME,
settings.OTHER_DATABASES['_a']['DATABASE_NAME'])
self.assertEqual(model_connection_name(MY), '_b')
self.assertEqual(
MY._default_manager.db.connection.settings.DATABASE_NAME,
settings.OTHER_DATABASES['_b']['DATABASE_NAME'])
self.assert_(MQ._default_manager.db.connection is
connections[_default].connection)
self.assertEqual(
MQ._default_manager.db.connection.settings.DATABASE_NAME,
settings.DATABASE_NAME)
self.assertEqual(connection.settings.DATABASE_NAME,
settings.DATABASE_NAME)
def request_two(self, path, request):
"""Between the first and second requests, settings change to assign
model MY to a different connection
"""
# from django.conf import settings
debug("request_two: %s", settings.OTHER_DATABASES)
try:
self.assertEqual(model_connection_name(MQ), _default)
self.assertEqual(model_connection_name(MX), '_a')
self.assertEqual(
MX._default_manager.db.connection.settings.DATABASE_NAME,
settings.OTHER_DATABASES['_a']['DATABASE_NAME'])
self.assertEqual(model_connection_name(MY), _default)
self.assertEqual(
MY._default_manager.db.connection.settings.DATABASE_NAME,
settings.DATABASE_NAME)
self.assert_(MQ._default_manager.db.connection is
connections[_default].connection)
self.assertEqual(
MQ._default_manager.db.connection.settings.DATABASE_NAME,
settings.DATABASE_NAME)
self.assertEqual(connection.settings.DATABASE_NAME,
settings.DATABASE_NAME)
except:
self.add_thread_error(sys.exc_info())
def request_three(self, path, request):
"""Between the 2nd and 3rd requests, the settings at the names in
OTHER_DATABASES have changed.
"""
# from django.conf import settings
debug("3 %s: %s", get_ident(), settings.OTHER_DATABASES)
debug("3 %s: default: %s", get_ident(), settings.DATABASE_NAME)
debug("3 %s: conn: %s", get_ident(),
connection.settings.DATABASE_NAME)
try:
self.assertEqual(model_connection_name(MQ), _default)
self.assertEqual(model_connection_name(MX), '_b')
self.assertEqual(
MX._default_manager.db.connection.settings.DATABASE_NAME,
settings.OTHER_DATABASES['_b']['DATABASE_NAME'])
self.assertEqual(model_connection_name(MY), '_a')
self.assertEqual(
MY._default_manager.db.connection.settings.DATABASE_NAME,
settings.OTHER_DATABASES['_a']['DATABASE_NAME'])
self.assert_(MQ._default_manager.db.connection is
connections[_default].connection)
self.assertEqual(
connection.settings.DATABASE_NAME,
settings.OTHER_DATABASES['_a']['DATABASE_NAME'])
except:
self.add_thread_error(sys.exc_info())
def test_thread_isolation(self):
debug("running tests")
env = os.environ.copy()
env['PATH_INFO'] = '/'
env['REQUEST_METHOD'] = 'GET'
t2 = thread_two(MockHandler(self.request_two), env, start_response)
t3 = thread_three(MockHandler(self.request_three), env, start_response)
try:
EV.set()
MockHandler(self.request_one)(env, start_response)
finally:
t2.join()
t3.join()
err = self.thread_errors()
if err:
import traceback
for e in err:
traceback.print_exception(*e)
raise AssertionError("%s thread%s failed" %
(len(err), len(err) > 1 and 's' or
''))
|
