from django.conf import settings settings.RUNNING_INSIDE_TORNADO = True from django.core.management.base import BaseCommand, CommandError from optparse import make_option import os import sys import tornado.web import logging import time from tornado import ioloop from zephyr.lib.debug import interactive_debug_listen # A hack to keep track of how much time we spend working, versus sleeping in # the event loop. # # Creating a new event loop instance with a custom impl object fails (events # don't get processed), so instead we modify the ioloop module variable holding # the default poll implementation. We need to do this before any Tornado code # runs that might instantiate the default event loop. orig_poll_impl = ioloop._poll class InstrumentedPoll(object): def __init__(self): self._underlying = orig_poll_impl() self._times = [] self._last_print = 0 # Python won't let us subclass e.g. select.epoll, so instead # we proxy every method. __getattr__ handles anything we # don't define elsewhere. def __getattr__(self, name): return getattr(self._underlying, name) # Call the underlying poll method, and report timing data. def poll(self, timeout): # Avoid accumulating a bunch of insignificant data points # from short timeouts. if timeout < 1e-3: return self._underlying.poll(timeout) # Record start and end times for the underlying poll t0 = time.time() result = self._underlying.poll(timeout) t1 = time.time() # Log this datapoint and restrict our log to the past minute self._times.append((t0, t1)) while self._times and self._times[0][0] < t1 - 60: self._times.pop(0) # Report (at most once every 5s) the percentage of time spent # outside poll if self._times and t1 - self._last_print >= 5: total = t1 - self._times[0][0] in_poll = sum(b-a for a,b in self._times) if total > 0: logging.info('Tornado %5.1f%% busy over the past %4.1f seconds' % (100 * (1 - in_poll/total), total)) self._last_print = t1 return result ioloop._poll = InstrumentedPoll class Command(BaseCommand): option_list = BaseCommand.option_list + ( make_option('--nokeepalive', action='store_true', dest='no_keep_alive', default=False, help="Tells Tornado to NOT keep alive http connections."), make_option('--noxheaders', action='store_false', dest='xheaders', default=True, help="Tells Tornado to NOT override remote IP with X-Real-IP."), ) help = "Starts a Tornado Web server wrapping Django." args = '[optional port number or ipaddr:port]\n (use multiple ports to start multiple servers)' def handle(self, addrport, **options): # setup unbuffered I/O sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 0) sys.stderr = os.fdopen(sys.stderr.fileno(), 'w', 0) interactive_debug_listen() import django from django.core.handlers.wsgi import WSGIHandler from tornado import httpserver, wsgi, web try: addr, port = addrport.split(':') except ValueError: addr, port = '', addrport if not addr: addr = '127.0.0.1' if not port.isdigit(): raise CommandError("%r is not a valid port number." % port) xheaders = options.get('xheaders', True) no_keep_alive = options.get('no_keep_alive', False) quit_command = 'CTRL-C' if settings.DEBUG: logging.basicConfig(level=logging.INFO, format='%(asctime)s %(levelname)-8s %(message)s') def inner_run(): from django.conf import settings from django.utils import translation translation.activate(settings.LANGUAGE_CODE) print "Validating Django models.py..." self.validate(display_num_errors=True) print "\nDjango version %s" % (django.get_version()) print "Tornado server is running at http://%s:%s/" % (addr, port) print "Quit the server with %s." % quit_command try: # Application is an instance of Django's standard wsgi handler. application = web.Application([(r"/json/get_updates", AsyncDjangoHandler), (r"/api/v1/get_messages", AsyncDjangoHandler), (r"/notify_new_message", AsyncDjangoHandler), (r"/notify_pointer_update", AsyncDjangoHandler), ], debug=django.conf.settings.DEBUG) # start tornado web server in single-threaded mode http_server = httpserver.HTTPServer(application, xheaders=xheaders, no_keep_alive=no_keep_alive) http_server.listen(int(port), address=addr) if django.conf.settings.DEBUG: ioloop.IOLoop.instance().set_blocking_log_threshold(5) ioloop.IOLoop.instance().start() except KeyboardInterrupt: sys.exit(0) inner_run() # # Modify the base Tornado handler for Django # from threading import Lock from django.core.handlers import base from django.core.urlresolvers import set_script_prefix from django.core import signals class AsyncDjangoHandler(tornado.web.RequestHandler, base.BaseHandler): initLock = Lock() def __init__(self, *args, **kwargs): super(AsyncDjangoHandler, self).__init__(*args, **kwargs) # Set up middleware if needed. We couldn't do this earlier, because # settings weren't available. self._request_middleware = None self.initLock.acquire() # Check that middleware is still uninitialised. if self._request_middleware is None: self.load_middleware() self.initLock.release() self._auto_finish = False def get(self): from tornado.wsgi import WSGIContainer from django.core.handlers.wsgi import WSGIRequest import urllib environ = WSGIContainer.environ(self.request) environ['PATH_INFO'] = urllib.unquote(environ['PATH_INFO']) request = WSGIRequest(environ) request._tornado_handler = self set_script_prefix(base.get_script_name(environ)) signals.request_started.send(sender=self.__class__) try: response = self.get_response(request) if not response: return finally: signals.request_finished.send(sender=self.__class__) self.set_status(response.status_code) for h in response.items(): self.set_header(h[0], h[1]) if not hasattr(self, "_new_cookies"): self._new_cookies = [] self._new_cookies.append(response.cookies) self.write(response.content) self.finish() def head(self): self.get() def post(self): self.get() # Based on django.core.handlers.base: get_response def get_response(self, request): "Returns an HttpResponse object for the given HttpRequest" from django import http from django.core import exceptions, urlresolvers from django.conf import settings try: try: # Setup default url resolver for this thread. urlconf = settings.ROOT_URLCONF urlresolvers.set_urlconf(urlconf) resolver = urlresolvers.RegexURLResolver(r'^/', urlconf) response = None # Apply request middleware for middleware_method in self._request_middleware: response = middleware_method(request) if response: break if hasattr(request, "urlconf"): # Reset url resolver with a custom urlconf. urlconf = request.urlconf urlresolvers.set_urlconf(urlconf) resolver = urlresolvers.RegexURLResolver(r'^/', urlconf) callback, callback_args, callback_kwargs = resolver.resolve( request.path_info) # Apply view middleware if response is None: for middleware_method in self._view_middleware: response = middleware_method(request, callback, callback_args, callback_kwargs) if response: break if response is None: from ...decorator import RespondAsynchronously try: response = callback(request, *callback_args, **callback_kwargs) if response is RespondAsynchronously: return except Exception, e: # If the view raised an exception, run it through exception # middleware, and if the exception middleware returns a # response, use that. Otherwise, reraise the exception. for middleware_method in self._exception_middleware: response = middleware_method(request, e) if response: break if response is None: raise if response is None: try: view_name = callback.func_name except AttributeError: view_name = callback.__class__.__name__ + '.__call__' raise ValueError("The view %s.%s returned None." % (callback.__module__, view_name)) # If the response supports deferred rendering, apply template # response middleware and the render the response if hasattr(response, 'render') and callable(response.render): for middleware_method in self._template_response_middleware: response = middleware_method(request, response) response = response.render() except http.Http404, e: if settings.DEBUG: from django.views import debug response = debug.technical_404_response(request, e) else: try: callback, param_dict = resolver.resolve404() response = callback(request, **param_dict) except: try: response = self.handle_uncaught_exception(request, resolver, sys.exc_info()) finally: signals.got_request_exception.send(sender=self.__class__, request=request) except exceptions.PermissionDenied: logging.warning( 'Forbidden (Permission denied): %s', request.path, extra={ 'status_code': 403, 'request': request }) try: callback, param_dict = resolver.resolve403() response = callback(request, **param_dict) except: try: response = self.handle_uncaught_exception(request, resolver, sys.exc_info()) finally: signals.got_request_exception.send( sender=self.__class__, request=request) except SystemExit: # See https://code.djangoproject.com/ticket/4701 raise except Exception, e: exc_info = sys.exc_info() signals.got_request_exception.send(sender=self.__class__, request=request) return self.handle_uncaught_exception(request, resolver, exc_info) finally: # Reset urlconf on the way out for isolation urlresolvers.set_urlconf(None) try: # Apply response middleware, regardless of the response for middleware_method in self._response_middleware: response = middleware_method(request, response) response = self.apply_response_fixes(request, response) except: # Any exception should be gathered and handled signals.got_request_exception.send(sender=self.__class__, request=request) response = self.handle_uncaught_exception(request, resolver, sys.exc_info()) return response def finish(self, response=None, request=None, apply_markdown=True): superself = super(AsyncDjangoHandler, self) if not isinstance(response, dict): return superself.finish(response) # Make sure that Markdown rendering really happened, if requested. # This is a security issue because it's where we escape HTML. # c.f. ticket #64 # # apply_markdown=True is the fail-safe default. if response['result'] == 'success' and 'messages' in response and apply_markdown: for msg in response['messages']: if msg['content_type'] != 'text/html': self.set_status(500) return superself.finish('Internal error: bad message format') if response['result'] == 'error': self.set_status(400) return superself.finish(response)