mirror of https://github.com/zulip/zulip.git
271 lines
12 KiB
Python
271 lines
12 KiB
Python
import logging
|
|
import urllib
|
|
import weakref
|
|
from typing import Any, Dict, List
|
|
|
|
import tornado.web
|
|
from asgiref.sync import sync_to_async
|
|
from django import http
|
|
from django.core import signals
|
|
from django.core.handlers import base
|
|
from django.core.handlers.wsgi import WSGIRequest, get_script_name
|
|
from django.http import HttpRequest, HttpResponse
|
|
from django.urls import set_script_prefix
|
|
from django.utils.cache import patch_vary_headers
|
|
from tornado.wsgi import WSGIContainer
|
|
|
|
from zerver.lib.response import AsynchronousResponse, json_response
|
|
from zerver.tornado.descriptors import get_descriptor_by_handler_id
|
|
|
|
current_handler_id = 0
|
|
handlers: Dict[int, "AsyncDjangoHandler"] = {}
|
|
|
|
|
|
def get_handler_by_id(handler_id: int) -> "AsyncDjangoHandler":
|
|
return handlers[handler_id]
|
|
|
|
|
|
def allocate_handler_id(handler: "AsyncDjangoHandler") -> int:
|
|
global current_handler_id
|
|
handlers[current_handler_id] = handler
|
|
handler.handler_id = current_handler_id
|
|
current_handler_id += 1
|
|
return handler.handler_id
|
|
|
|
|
|
def clear_handler_by_id(handler_id: int) -> None:
|
|
del handlers[handler_id]
|
|
|
|
|
|
def handler_stats_string() -> str:
|
|
return f"{len(handlers)} handlers, latest ID {current_handler_id}"
|
|
|
|
|
|
def finish_handler(
|
|
handler_id: int, event_queue_id: str, contents: List[Dict[str, Any]], apply_markdown: bool
|
|
) -> None:
|
|
try:
|
|
# We do the import during runtime to avoid cyclic dependency
|
|
# with zerver.lib.request
|
|
from zerver.lib.request import RequestNotes
|
|
from zerver.middleware import async_request_timer_restart
|
|
|
|
# We call async_request_timer_restart here in case we are
|
|
# being finished without any events (because another
|
|
# get_events request has supplanted this request)
|
|
handler = get_handler_by_id(handler_id)
|
|
request = handler._request
|
|
async_request_timer_restart(request)
|
|
log_data = RequestNotes.get_notes(request).log_data
|
|
assert log_data is not None
|
|
if len(contents) != 1:
|
|
log_data["extra"] = f"[{event_queue_id}/1]"
|
|
else:
|
|
log_data["extra"] = "[{}/1/{}]".format(event_queue_id, contents[0]["type"])
|
|
|
|
tornado.ioloop.IOLoop.current().add_callback(
|
|
handler.zulip_finish,
|
|
dict(result="success", msg="", events=contents, queue_id=event_queue_id),
|
|
request,
|
|
apply_markdown=apply_markdown,
|
|
)
|
|
except Exception as e:
|
|
if not (
|
|
(isinstance(e, OSError) and str(e) == "Stream is closed")
|
|
or (isinstance(e, AssertionError) and str(e) == "Request closed")
|
|
):
|
|
logging.exception(
|
|
"Got error finishing handler for queue %s", event_queue_id, stack_info=True
|
|
)
|
|
|
|
|
|
class AsyncDjangoHandler(tornado.web.RequestHandler, base.BaseHandler):
|
|
def __init__(self, *args: Any, **kwargs: Any) -> None:
|
|
super().__init__(*args, **kwargs)
|
|
|
|
# Copied from the django.core.handlers.wsgi __init__() method.
|
|
self.load_middleware()
|
|
|
|
# Prevent Tornado from automatically finishing the request
|
|
self._auto_finish = False
|
|
|
|
# Handler IDs are allocated here, and the handler ID map must
|
|
# be cleared when the handler finishes its response
|
|
allocate_handler_id(self)
|
|
|
|
def __repr__(self) -> str:
|
|
descriptor = get_descriptor_by_handler_id(self.handler_id)
|
|
return f"AsyncDjangoHandler<{self.handler_id}, {descriptor}>"
|
|
|
|
def convert_tornado_request_to_django_request(self) -> HttpRequest:
|
|
# This takes the WSGI environment that Tornado received (which
|
|
# fully describes the HTTP request that was sent to Tornado)
|
|
# and pass it to Django's WSGIRequest to generate a Django
|
|
# HttpRequest object with the original Tornado request's HTTP
|
|
# headers, parameters, etc.
|
|
environ = WSGIContainer.environ(self.request)
|
|
environ["PATH_INFO"] = urllib.parse.unquote(environ["PATH_INFO"])
|
|
|
|
# Django WSGIRequest setup code that should match logic from
|
|
# Django's WSGIHandler.__call__ before the call to
|
|
# `get_response()`.
|
|
set_script_prefix(get_script_name(environ))
|
|
signals.request_started.send(sender=self.__class__)
|
|
request = WSGIRequest(environ)
|
|
|
|
# We do the import during runtime to avoid cyclic dependency
|
|
from zerver.lib.request import RequestNotes
|
|
|
|
# Provide a way for application code to access this handler
|
|
# given the HttpRequest object.
|
|
RequestNotes.get_notes(request).tornado_handler = weakref.ref(self)
|
|
|
|
return request
|
|
|
|
async def write_django_response_as_tornado_response(self, response: HttpResponse) -> None:
|
|
# This takes a Django HttpResponse and copies its HTTP status
|
|
# code, headers, cookies, and content onto this
|
|
# tornado.web.RequestHandler (which is how Tornado prepares a
|
|
# response to write).
|
|
|
|
# Copy the HTTP status code.
|
|
self.set_status(response.status_code)
|
|
|
|
# Copy the HTTP headers (iterating through a Django
|
|
# HttpResponse is the way to access its headers as key/value pairs)
|
|
for h in response.items():
|
|
self.set_header(h[0], h[1])
|
|
|
|
# Copy any cookies
|
|
if not hasattr(self, "_new_cookies"):
|
|
self._new_cookies: List[http.cookie.SimpleCookie[str]] = []
|
|
self._new_cookies.append(response.cookies)
|
|
|
|
# Copy the response content
|
|
self.write(response.content)
|
|
|
|
# Close the connection.
|
|
await self.finish()
|
|
|
|
async def get(self, *args: Any, **kwargs: Any) -> None:
|
|
request = self.convert_tornado_request_to_django_request()
|
|
response = await sync_to_async(lambda: self.get_response(request), thread_sensitive=True)()
|
|
|
|
try:
|
|
if isinstance(response, AsynchronousResponse):
|
|
# We import async_request_timer_restart during runtime
|
|
# to avoid cyclic dependency with zerver.lib.request
|
|
from zerver.middleware import async_request_timer_stop
|
|
|
|
# For asynchronous requests, this is where we exit
|
|
# without returning the HttpResponse that Django
|
|
# generated back to the user in order to long-poll the
|
|
# connection. We save some timers here in order to
|
|
# support accurate accounting of the total resources
|
|
# consumed by the request when it eventually returns a
|
|
# response and is logged.
|
|
async_request_timer_stop(request)
|
|
else:
|
|
# For normal/synchronous requests that don't end up
|
|
# long-polling, we just need to write the HTTP
|
|
# response that Django prepared for us via Tornado.
|
|
|
|
# Mark this handler ID as finished for Zulip's own tracking.
|
|
clear_handler_by_id(self.handler_id)
|
|
|
|
assert isinstance(response, HttpResponse)
|
|
await self.write_django_response_as_tornado_response(response)
|
|
finally:
|
|
# Tell Django that we're done processing this request on
|
|
# the Django side; this triggers cleanup work like
|
|
# resetting the urlconf and any cache/database
|
|
# connections.
|
|
await sync_to_async(response.close, thread_sensitive=True)()
|
|
|
|
async def head(self, *args: Any, **kwargs: Any) -> None:
|
|
await self.get(*args, **kwargs)
|
|
|
|
async def post(self, *args: Any, **kwargs: Any) -> None:
|
|
await self.get(*args, **kwargs)
|
|
|
|
async def delete(self, *args: Any, **kwargs: Any) -> None:
|
|
await self.get(*args, **kwargs)
|
|
|
|
def on_connection_close(self) -> None:
|
|
# Register a Tornado handler that runs when client-side
|
|
# connections are closed to notify the events system.
|
|
#
|
|
# TODO: Theoretically, this code should run when you Ctrl-C
|
|
# curl to cause it to break a `GET /events` connection, but
|
|
# that seems to no longer run this code. Investigate what's up.
|
|
client_descriptor = get_descriptor_by_handler_id(self.handler_id)
|
|
if client_descriptor is not None:
|
|
client_descriptor.disconnect_handler(client_closed=True)
|
|
|
|
async def zulip_finish(
|
|
self, result_dict: Dict[str, Any], old_request: HttpRequest, apply_markdown: bool
|
|
) -> None:
|
|
# Function called when we want to break a long-polled
|
|
# get_events request and return a response to the client.
|
|
|
|
# Marshall the response data from result_dict.
|
|
if result_dict["result"] == "success" and "messages" in result_dict and apply_markdown:
|
|
for msg in result_dict["messages"]:
|
|
if msg["content_type"] != "text/html":
|
|
self.set_status(500)
|
|
await self.finish("Internal error: bad message format")
|
|
if result_dict["result"] == "error":
|
|
self.set_status(400)
|
|
|
|
# The `result` dictionary contains the data we want to return
|
|
# to the client. We want to do so in a proper Tornado HTTP
|
|
# response after running the Django response middleware (which
|
|
# does things like log the request, add rate-limit headers,
|
|
# etc.). The Django middleware API expects to receive a fresh
|
|
# HttpRequest object, and so to minimize hacks, our strategy
|
|
# is to create a duplicate Django HttpRequest object, tagged
|
|
# to automatically return our data in its response, and call
|
|
# Django's main self.get_response() handler to generate an
|
|
# HttpResponse with all Django middleware run.
|
|
request = self.convert_tornado_request_to_django_request()
|
|
|
|
# We import RequestNotes during runtime to avoid
|
|
# cyclic import
|
|
from zerver.lib.request import RequestNotes
|
|
|
|
request_notes = RequestNotes.get_notes(request)
|
|
old_request_notes = RequestNotes.get_notes(old_request)
|
|
|
|
# Add to this new HttpRequest logging data from the processing of
|
|
# the original request; we will need these for logging.
|
|
request_notes.log_data = old_request_notes.log_data
|
|
if request_notes.rate_limit is not None:
|
|
request_notes.rate_limit = old_request_notes.rate_limit
|
|
if request_notes.requestor_for_logs is not None:
|
|
request_notes.requestor_for_logs = old_request_notes.requestor_for_logs
|
|
request.user = old_request.user
|
|
request_notes.client = old_request_notes.client
|
|
request_notes.client_name = old_request_notes.client_name
|
|
request_notes.client_version = old_request_notes.client_version
|
|
|
|
# The saved_response attribute, if present, causes
|
|
# rest_dispatch to return the response immediately before
|
|
# doing any work. This arrangement allows Django's full
|
|
# request/middleware system to run unmodified while avoiding
|
|
# running expensive things like Zulip's authentication code a
|
|
# second time.
|
|
request_notes.saved_response = json_response(
|
|
res_type=result_dict["result"], data=result_dict, status=self.get_status()
|
|
)
|
|
|
|
response = await sync_to_async(lambda: self.get_response(request), thread_sensitive=True)()
|
|
try:
|
|
# Explicitly mark requests as varying by cookie, since the
|
|
# middleware will not have seen a session access
|
|
patch_vary_headers(response, ("Cookie",))
|
|
assert isinstance(response, HttpResponse)
|
|
await self.write_django_response_as_tornado_response(response)
|
|
finally:
|
|
# Tell Django we're done processing this request
|
|
await sync_to_async(response.close, thread_sensitive=True)()
|