mirror of https://github.com/zulip/zulip.git
318 lines
14 KiB
Python
318 lines
14 KiB
Python
from __future__ import absolute_import
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from __future__ import print_function
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import sys
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import tornado.web
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import logging
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from django import http
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from django.conf import settings
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from django.core.handlers.wsgi import WSGIRequest, get_script_name
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from django.core.handlers import base
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from django.core.urlresolvers import set_script_prefix
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from django.core import signals
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from django.core import exceptions, urlresolvers
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from django.http import HttpRequest, HttpResponse
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from threading import Lock
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from tornado.wsgi import WSGIContainer
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from six.moves import urllib
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from zerver.decorator import RespondAsynchronously
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from zerver.lib.response import json_response
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from zerver.middleware import async_request_stop, async_request_restart
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from zerver.tornado.descriptors import get_descriptor_by_handler_id
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from typing import Any, Callable, Dict, List
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current_handler_id = 0
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handlers = {} # type: Dict[int, AsyncDjangoHandler]
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def get_handler_by_id(handler_id):
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# type: (int) -> AsyncDjangoHandler
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return handlers[handler_id]
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def allocate_handler_id(handler):
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# type: (AsyncDjangoHandler) -> int
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global current_handler_id
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handlers[current_handler_id] = handler
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handler.handler_id = current_handler_id
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current_handler_id += 1
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return handler.handler_id
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def clear_handler_by_id(handler_id):
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# type: (int) -> None
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del handlers[handler_id]
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def handler_stats_string():
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# type: () -> str
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return "%s handlers, latest ID %s" % (len(handlers), current_handler_id)
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def finish_handler(handler_id, event_queue_id, contents, apply_markdown):
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# type: (int, str, List[Dict[str, Any]], bool) -> None
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err_msg = "Got error finishing handler for queue %s" % (event_queue_id,)
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try:
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# We call async_request_restart here in case we are
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# being finished without any events (because another
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# get_events request has supplanted this request)
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handler = get_handler_by_id(handler_id)
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request = handler._request
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async_request_restart(request)
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if len(contents) != 1:
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request._log_data['extra'] = "[%s/1]" % (event_queue_id,)
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else:
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request._log_data['extra'] = "[%s/1/%s]" % (event_queue_id, contents[0]["type"])
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handler.zulip_finish(dict(result='success', msg='',
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events=contents,
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queue_id=event_queue_id),
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request, apply_markdown=apply_markdown)
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except IOError as e:
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if str(e) != 'Stream is closed':
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logging.exception(err_msg)
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except AssertionError as e:
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if str(e) != 'Request closed':
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logging.exception(err_msg)
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except Exception:
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logging.exception(err_msg)
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# Modified version of the base Tornado handler for Django
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class AsyncDjangoHandler(tornado.web.RequestHandler, base.BaseHandler):
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initLock = Lock()
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def __init__(self, *args, **kwargs):
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# type: (*Any, **Any) -> None
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super(AsyncDjangoHandler, self).__init__(*args, **kwargs)
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# Set up middleware if needed. We couldn't do this earlier, because
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# settings weren't available.
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self._request_middleware = None # type: ignore # See self._request_middleware block below
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self.initLock.acquire()
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# Check that middleware is still uninitialised.
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if self._request_middleware is None:
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self.load_middleware()
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self.initLock.release()
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self._auto_finish = False
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# Handler IDs are allocated here, and the handler ID map must
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# be cleared when the handler finishes its response
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allocate_handler_id(self)
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def __repr__(self):
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# type: () -> str
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descriptor = get_descriptor_by_handler_id(self.handler_id)
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return "AsyncDjangoHandler<%s, %s>" % (self.handler_id, descriptor)
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def get(self, *args, **kwargs):
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# type: (*Any, **Any) -> None
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environ = WSGIContainer.environ(self.request)
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environ['PATH_INFO'] = urllib.parse.unquote(environ['PATH_INFO'])
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request = WSGIRequest(environ)
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request._tornado_handler = self
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set_script_prefix(get_script_name(environ))
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signals.request_started.send(sender=self.__class__)
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try:
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response = self.get_response(request)
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if not response:
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return
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finally:
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signals.request_finished.send(sender=self.__class__)
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self.set_status(response.status_code)
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for h in response.items():
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self.set_header(h[0], h[1])
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if not hasattr(self, "_new_cookies"):
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self._new_cookies = [] # type: List[http.cookie.SimpleCookie]
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self._new_cookies.append(response.cookies)
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self.write(response.content)
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self.finish()
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def head(self, *args, **kwargs):
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# type: (*Any, **Any) -> None
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self.get(*args, **kwargs)
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def post(self, *args, **kwargs):
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# type: (*Any, **Any) -> None
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self.get(*args, **kwargs)
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def delete(self, *args, **kwargs):
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# type: (*Any, **Any) -> None
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self.get(*args, **kwargs)
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def on_connection_close(self):
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# type: () -> None
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client_descriptor = get_descriptor_by_handler_id(self.handler_id)
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if client_descriptor is not None:
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client_descriptor.disconnect_handler(client_closed=True)
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# Based on django.core.handlers.base: get_response
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def get_response(self, request):
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# type: (HttpRequest) -> HttpResponse
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"Returns an HttpResponse object for the given HttpRequest"
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try:
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try:
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# Setup default url resolver for this thread.
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urlconf = settings.ROOT_URLCONF
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urlresolvers.set_urlconf(urlconf)
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resolver = urlresolvers.RegexURLResolver(r'^/', urlconf)
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response = None
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# Apply request middleware
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for middleware_method in self._request_middleware: # type: ignore # Should be List[Callable[[WSGIRequest], Any]] https://github.com/JukkaL/mypy/issues/1174
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response = middleware_method(request)
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if response:
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break
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if hasattr(request, "urlconf"):
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# Reset url resolver with a custom urlconf.
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urlconf = request.urlconf
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urlresolvers.set_urlconf(urlconf)
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resolver = urlresolvers.RegexURLResolver(r'^/', urlconf)
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### ADDED BY ZULIP
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request._resolver = resolver
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### END ADDED BY ZULIP
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callback, callback_args, callback_kwargs = resolver.resolve(
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request.path_info)
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# Apply view middleware
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if response is None:
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for middleware_method in self._view_middleware:
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response = middleware_method(request, callback, callback_args,
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callback_kwargs)
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if response:
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break
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### THIS BLOCK MODIFIED BY ZULIP
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if response is None:
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try:
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response = callback(request, *callback_args, **callback_kwargs)
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if response is RespondAsynchronously:
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async_request_stop(request)
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return None
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clear_handler_by_id(self.handler_id)
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except Exception as e:
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clear_handler_by_id(self.handler_id)
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# If the view raised an exception, run it through exception
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# middleware, and if the exception middleware returns a
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# response, use that. Otherwise, reraise the exception.
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for middleware_method in self._exception_middleware:
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response = middleware_method(request, e)
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if response:
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break
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if response is None:
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raise
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if response is None:
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try:
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view_name = callback.__name__
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except AttributeError:
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view_name = callback.__class__.__name__ + '.__call__'
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raise ValueError("The view %s.%s returned None." %
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(callback.__module__, view_name))
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# If the response supports deferred rendering, apply template
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# response middleware and the render the response
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if hasattr(response, 'render') and callable(response.render):
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for middleware_method in self._template_response_middleware:
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response = middleware_method(request, response)
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response = response.render()
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except http.Http404 as e:
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if settings.DEBUG:
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from django.views import debug
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response = debug.technical_404_response(request, e)
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else:
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try:
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callback, param_dict = resolver.resolve404()
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response = callback(request, **param_dict)
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except Exception:
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try:
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response = self.handle_uncaught_exception(request, resolver,
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sys.exc_info())
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finally:
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signals.got_request_exception.send(sender=self.__class__,
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request=request)
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except exceptions.PermissionDenied:
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logging.warning(
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'Forbidden (Permission denied): %s', request.path,
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extra={
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'status_code': 403,
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'request': request
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})
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try:
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callback, param_dict = resolver.resolve403()
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response = callback(request, **param_dict)
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except Exception:
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try:
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response = self.handle_uncaught_exception(request,
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resolver, sys.exc_info())
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finally:
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signals.got_request_exception.send(
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sender=self.__class__, request=request)
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except SystemExit:
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# See https://code.djangoproject.com/ticket/4701
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raise
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except Exception as e:
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exc_info = sys.exc_info()
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signals.got_request_exception.send(sender=self.__class__, request=request)
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return self.handle_uncaught_exception(request, resolver, exc_info)
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finally:
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# Reset urlconf on the way out for isolation
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urlresolvers.set_urlconf(None)
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### ZULIP CHANGE: The remainder of this function was moved
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### into its own function, just below, so we can call it from
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### finish().
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response = self.apply_response_middleware(request, response, resolver)
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return response
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### Copied from get_response (above in this file)
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def apply_response_middleware(self, request, response, resolver):
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# type: (HttpRequest, HttpResponse, urlresolvers.RegexURLResolver) -> HttpResponse
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try:
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# Apply response middleware, regardless of the response
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for middleware_method in self._response_middleware:
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response = middleware_method(request, response)
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if hasattr(self, 'apply_response_fixes'):
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response = self.apply_response_fixes(request, response)
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except Exception: # Any exception should be gathered and handled
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signals.got_request_exception.send(sender=self.__class__, request=request)
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response = self.handle_uncaught_exception(request, resolver, sys.exc_info())
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return response
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def zulip_finish(self, response, request, apply_markdown):
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# type: (HttpResponse, HttpRequest, bool) -> None
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# Make sure that Markdown rendering really happened, if requested.
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# This is a security issue because it's where we escape HTML.
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# c.f. ticket #64
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#
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# apply_markdown=True is the fail-safe default.
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if response['result'] == 'success' and 'messages' in response and apply_markdown:
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for msg in response['messages']:
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if msg['content_type'] != 'text/html':
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self.set_status(500)
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self.finish('Internal error: bad message format')
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if response['result'] == 'error':
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self.set_status(400)
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# Call the Django response middleware on our object so that
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# e.g. our own logging code can run; but don't actually use
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# the headers from that since sending those to Tornado seems
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# tricky; instead just send the (already json-rendered)
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# content on to Tornado
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django_response = json_response(res_type=response['result'],
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data=response, status=self.get_status())
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django_response = self.apply_response_middleware(request, django_response,
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request._resolver)
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# Pass through the content-type from Django, as json content should be
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# served as application/json
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self.set_header("Content-Type", django_response['Content-Type'])
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self.finish(django_response.content)
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