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January 26, 2012 21:13
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LiveServerTestCase backported to Django 1.3
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""" LiveServerTestCase extracted from Django 1.4 alpha source """ | |
import os | |
import threading | |
import select | |
from django.conf import settings | |
from django.db import connections, DEFAULT_DB_ALIAS | |
from django.core.management import call_command | |
from django.contrib.staticfiles.handlers import StaticFilesHandler | |
from django.core.handlers.wsgi import WSGIHandler | |
from django.core.servers.basehttp import (WSGIRequestHandler, WSGIServer, | |
WSGIServerException) | |
from django.test.testcases import TransactionTestCase | |
class _ImprovedEvent(threading._Event): | |
""" | |
Does the same as `threading.Event` except it overrides the wait() method | |
with some code borrowed from Python 2.7 to return the set state of the | |
event (see: http://hg.python.org/cpython/rev/b5aa8aa78c0f/). This allows | |
to know whether the wait() method exited normally or because of the | |
timeout. This class can be removed when Django supports only Python >= 2.7. | |
""" | |
def wait(self, timeout=None): | |
self._Event__cond.acquire() | |
try: | |
if not self._Event__flag: | |
self._Event__cond.wait(timeout) | |
return self._Event__flag | |
finally: | |
self._Event__cond.release() | |
class QuietWSGIRequestHandler(WSGIRequestHandler): | |
""" | |
Just a regular WSGIRequestHandler except it doesn't log to the standard | |
output any of the requests received, so as to not clutter the output for | |
the tests' results. | |
""" | |
def log_message(*args): | |
pass | |
class StoppableWSGIServer(WSGIServer): | |
""" | |
The code in this class is borrowed from the `SocketServer.BaseServer` class | |
in Python 2.6. The important functionality here is that the server is non- | |
blocking and that it can be shut down at any moment. This is made possible | |
by the server regularly polling the socket and checking if it has been | |
asked to stop. | |
Note for the future: Once Django stops supporting Python 2.6, this class | |
can be removed as `WSGIServer` will have this ability to shutdown on | |
demand and will not require the use of the _ImprovedEvent class whose code | |
is borrowed from Python 2.7. | |
""" | |
def __init__(self, *args, **kwargs): | |
WSGIServer.__init__(self, *args, **kwargs) | |
self.__is_shut_down = _ImprovedEvent() | |
self.__serving = False | |
def serve_forever(self, poll_interval=0.5): | |
""" | |
Handle one request at a time until shutdown. | |
Polls for shutdown every poll_interval seconds. | |
""" | |
self.__serving = True | |
self.__is_shut_down.clear() | |
while self.__serving: | |
r, w, e = select.select([self], [], [], poll_interval) | |
if r: | |
self._handle_request_noblock() | |
self.__is_shut_down.set() | |
def shutdown(self): | |
""" | |
Stops the serve_forever loop. | |
Blocks until the loop has finished. This must be called while | |
serve_forever() is running in another thread, or it will | |
deadlock. | |
""" | |
self.__serving = False | |
if not self.__is_shut_down.wait(2): | |
raise RuntimeError( | |
"Failed to shutdown the live test server in 2 seconds. The " | |
"server might be stuck or generating a slow response.") | |
def handle_request(self): | |
"""Handle one request, possibly blocking. | |
""" | |
fd_sets = select.select([self], [], [], None) | |
if not fd_sets[0]: | |
return | |
self._handle_request_noblock() | |
def _handle_request_noblock(self): | |
""" | |
Handle one request, without blocking. | |
I assume that select.select has returned that the socket is | |
readable before this function was called, so there should be | |
no risk of blocking in get_request(). | |
""" | |
try: | |
request, client_address = self.get_request() | |
except socket.error: | |
return | |
if self.verify_request(request, client_address): | |
try: | |
self.process_request(request, client_address) | |
except Exception: | |
self.handle_error(request, client_address) | |
self.close_request(request) | |
class _MediaFilesHandler(StaticFilesHandler): | |
""" | |
Handler for serving the media files. This is a private class that is | |
meant to be used solely as a convenience by LiveServerThread. | |
""" | |
def get_base_dir(self): | |
return settings.MEDIA_ROOT | |
def get_base_url(self): | |
return settings.MEDIA_URL | |
def serve(self, request): | |
return serve(request, self.file_path(request.path), | |
document_root=self.get_base_dir()) | |
class LiveServerThread(threading.Thread): | |
""" | |
Thread for running a live http server while the tests are running. | |
""" | |
def __init__(self, host, possible_ports, connections_override=None): | |
self.host = host | |
self.port = None | |
self.possible_ports = possible_ports | |
self.is_ready = threading.Event() | |
self.error = None | |
self.connections_override = connections_override | |
super(LiveServerThread, self).__init__() | |
def run(self): | |
""" | |
Sets up the live server and databases, and then loops over handling | |
http requests. | |
""" | |
if self.connections_override: | |
from django.db import connections | |
# Override this thread's database connections with the ones | |
# provided by the main thread. | |
for alias, conn in self.connections_override.items(): | |
conn.allow_thread_sharing = True | |
connections._connections[alias] = conn | |
try: | |
# Create the handler for serving static and media files | |
handler = StaticFilesHandler(_MediaFilesHandler(WSGIHandler())) | |
# Go through the list of possible ports, hoping that we can find | |
# one that is free to use for the WSGI server. | |
for index, port in enumerate(self.possible_ports): | |
try: | |
self.httpd = StoppableWSGIServer( | |
(self.host, port), QuietWSGIRequestHandler) | |
except WSGIServerException, e: | |
if sys.version_info < (2, 6): | |
error_code = e.args[0].args[0] | |
else: | |
error_code = e.args[0].errno | |
if (index + 1 < len(self.possible_ports) and | |
error_code == errno.EADDRINUSE): | |
# This port is already in use, so we go on and try with | |
# the next one in the list. | |
continue | |
else: | |
# Either none of the given ports are free or the error | |
# is something else than "Address already in use". So | |
# we let that error bubble up to the main thread. | |
raise | |
else: | |
# A free port was found. | |
self.port = port | |
break | |
self.httpd.set_app(handler) | |
self.is_ready.set() | |
self.httpd.serve_forever() | |
except Exception, e: | |
self.error = e | |
self.is_ready.set() | |
def join(self, timeout=None): | |
if hasattr(self, 'httpd'): | |
# Stop the WSGI server | |
self.httpd.shutdown() | |
self.httpd.server_close() | |
super(LiveServerThread, self).join(timeout) | |
class LiveServerTestCase(TransactionTestCase): | |
""" | |
Does basically the same as TransactionTestCase but also launches a live | |
http server in a separate thread so that the tests may use another testing | |
framework, such as Selenium for example, instead of the built-in dummy | |
client. | |
Note that it inherits from TransactionTestCase instead of TestCase because | |
the threads do not share the same transactions (unless if using in-memory | |
sqlite) and each thread needs to commit all their transactions so that the | |
other thread can see the changes. | |
""" | |
@property | |
def live_server_url(self): | |
return 'http://%s:%s' % ( | |
self.server_thread.host, self.server_thread.port) | |
@classmethod | |
def setUpClass(cls): | |
connections_override = {} | |
for conn in connections.all(): | |
# If using in-memory sqlite databases, pass the connections to | |
# the server thread. | |
if (conn.settings_dict['ENGINE'] == 'django.db.backends.sqlite3' | |
and conn.settings_dict['NAME'] == ':memory:'): | |
# Explicitly enable thread-shareability for this connection | |
conn.allow_thread_sharing = True | |
connections_override[conn.alias] = conn | |
# Launch the live server's thread | |
specified_address = os.environ.get( | |
'DJANGO_LIVE_TEST_SERVER_ADDRESS', 'localhost:8081') | |
# The specified ports may be of the form '8000-8010,8080,9200-9300' | |
# i.e. a comma-separated list of ports or ranges of ports, so we break | |
# it down into a detailed list of all possible ports. | |
possible_ports = [] | |
try: | |
host, port_ranges = specified_address.split(':') | |
for port_range in port_ranges.split(','): | |
# A port range can be of either form: '8000' or '8000-8010'. | |
extremes = map(int, port_range.split('-')) | |
assert len(extremes) in [1, 2] | |
if len(extremes) == 1: | |
# Port range of the form '8000' | |
possible_ports.append(extremes[0]) | |
else: | |
# Port range of the form '8000-8010' | |
for port in range(extremes[0], extremes[1] + 1): | |
possible_ports.append(port) | |
except Exception: | |
raise ImproperlyConfigured('Invalid address ("%s") for live ' | |
'server.' % specified_address) | |
cls.server_thread = LiveServerThread( | |
host, possible_ports, connections_override) | |
cls.server_thread.daemon = True | |
cls.server_thread.start() | |
# Wait for the live server to be ready | |
cls.server_thread.is_ready.wait() | |
if cls.server_thread.error: | |
raise cls.server_thread.error | |
super(LiveServerTestCase, cls).setUpClass() | |
@classmethod | |
def tearDownClass(cls): | |
# There may not be a 'server_thread' attribute if setUpClass() for some | |
# reasons has raised an exception. | |
if hasattr(cls, 'server_thread'): | |
# Terminate the live server's thread | |
cls.server_thread.join() | |
super(LiveServerTestCase, cls).tearDownClass() | |
# -------------------- | |
# Example using splinter | |
# -------------------- | |
from splinter.browser import Browser | |
class SplinterTestCase(LiveServerTestCase): | |
@classmethod | |
def setUpClass(cls): | |
cls.browser = Browser() | |
super(SplinterTestCase, cls).setUpClass() | |
@classmethod | |
def tearDownClass(cls): | |
cls.browser.quit() | |
super(SplinterTestCase, cls).tearDownClass() | |
class LoginUiTest(SplinterTestCase): | |
fixtures = ['user_data.json'] | |
def test_login(self): | |
self.browser.visit('%s%s' % (self.live_server_url, '/accounts/login/')) | |
self.browser.fill('username', 'admin') | |
self.browser.fill('password', 'mysecretpassword') | |
self.browser.find_by_css('#login').first.click() |
I just discovered https://github.com/akoumjian/django-liveserver which I think is the same thing, but installable using distutils.
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