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209 lines
7.8 KiB
Python
209 lines
7.8 KiB
Python
2 years ago
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#
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# Copyright 2009 Facebook
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""WSGI support for the Tornado web framework.
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WSGI is the Python standard for web servers, and allows for interoperability
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between Tornado and other Python web frameworks and servers.
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This module provides WSGI support via the `WSGIContainer` class, which
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makes it possible to run applications using other WSGI frameworks on
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the Tornado HTTP server. The reverse is not supported; the Tornado
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`.Application` and `.RequestHandler` classes are designed for use with
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the Tornado `.HTTPServer` and cannot be used in a generic WSGI
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container.
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"""
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import sys
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from io import BytesIO
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import tornado
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from tornado import escape
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from tornado import httputil
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from tornado.log import access_log
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from typing import List, Tuple, Optional, Callable, Any, Dict, Text
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from types import TracebackType
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import typing
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if typing.TYPE_CHECKING:
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from typing import Type # noqa: F401
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from _typeshed.wsgi import WSGIApplication as WSGIAppType # noqa: F401
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# PEP 3333 specifies that WSGI on python 3 generally deals with byte strings
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# that are smuggled inside objects of type unicode (via the latin1 encoding).
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# This function is like those in the tornado.escape module, but defined
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# here to minimize the temptation to use it in non-wsgi contexts.
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def to_wsgi_str(s: bytes) -> str:
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assert isinstance(s, bytes)
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return s.decode("latin1")
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class WSGIContainer(object):
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r"""Makes a WSGI-compatible function runnable on Tornado's HTTP server.
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.. warning::
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WSGI is a *synchronous* interface, while Tornado's concurrency model
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is based on single-threaded asynchronous execution. This means that
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running a WSGI app with Tornado's `WSGIContainer` is *less scalable*
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than running the same app in a multi-threaded WSGI server like
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``gunicorn`` or ``uwsgi``. Use `WSGIContainer` only when there are
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benefits to combining Tornado and WSGI in the same process that
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outweigh the reduced scalability.
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Wrap a WSGI function in a `WSGIContainer` and pass it to `.HTTPServer` to
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run it. For example::
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def simple_app(environ, start_response):
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status = "200 OK"
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response_headers = [("Content-type", "text/plain")]
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start_response(status, response_headers)
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return [b"Hello world!\n"]
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async def main():
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container = tornado.wsgi.WSGIContainer(simple_app)
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http_server = tornado.httpserver.HTTPServer(container)
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http_server.listen(8888)
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await asyncio.Event().wait()
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asyncio.run(main())
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This class is intended to let other frameworks (Django, web.py, etc)
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run on the Tornado HTTP server and I/O loop.
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The `tornado.web.FallbackHandler` class is often useful for mixing
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Tornado and WSGI apps in the same server. See
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https://github.com/bdarnell/django-tornado-demo for a complete example.
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"""
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def __init__(self, wsgi_application: "WSGIAppType") -> None:
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self.wsgi_application = wsgi_application
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def __call__(self, request: httputil.HTTPServerRequest) -> None:
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data = {} # type: Dict[str, Any]
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response = [] # type: List[bytes]
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def start_response(
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status: str,
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headers: List[Tuple[str, str]],
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exc_info: Optional[
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Tuple[
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"Optional[Type[BaseException]]",
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Optional[BaseException],
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Optional[TracebackType],
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]
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] = None,
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) -> Callable[[bytes], Any]:
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data["status"] = status
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data["headers"] = headers
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return response.append
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app_response = self.wsgi_application(
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WSGIContainer.environ(request), start_response
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)
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try:
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response.extend(app_response)
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body = b"".join(response)
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finally:
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if hasattr(app_response, "close"):
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app_response.close() # type: ignore
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if not data:
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raise Exception("WSGI app did not call start_response")
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status_code_str, reason = data["status"].split(" ", 1)
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status_code = int(status_code_str)
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headers = data["headers"] # type: List[Tuple[str, str]]
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header_set = set(k.lower() for (k, v) in headers)
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body = escape.utf8(body)
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if status_code != 304:
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if "content-length" not in header_set:
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headers.append(("Content-Length", str(len(body))))
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if "content-type" not in header_set:
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headers.append(("Content-Type", "text/html; charset=UTF-8"))
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if "server" not in header_set:
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headers.append(("Server", "TornadoServer/%s" % tornado.version))
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start_line = httputil.ResponseStartLine("HTTP/1.1", status_code, reason)
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header_obj = httputil.HTTPHeaders()
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for key, value in headers:
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header_obj.add(key, value)
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assert request.connection is not None
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request.connection.write_headers(start_line, header_obj, chunk=body)
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request.connection.finish()
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self._log(status_code, request)
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@staticmethod
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def environ(request: httputil.HTTPServerRequest) -> Dict[Text, Any]:
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"""Converts a `tornado.httputil.HTTPServerRequest` to a WSGI environment."""
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hostport = request.host.split(":")
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if len(hostport) == 2:
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host = hostport[0]
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port = int(hostport[1])
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else:
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host = request.host
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port = 443 if request.protocol == "https" else 80
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environ = {
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"REQUEST_METHOD": request.method,
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"SCRIPT_NAME": "",
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"PATH_INFO": to_wsgi_str(
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escape.url_unescape(request.path, encoding=None, plus=False)
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),
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"QUERY_STRING": request.query,
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"REMOTE_ADDR": request.remote_ip,
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"SERVER_NAME": host,
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"SERVER_PORT": str(port),
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"SERVER_PROTOCOL": request.version,
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"wsgi.version": (1, 0),
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"wsgi.url_scheme": request.protocol,
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"wsgi.input": BytesIO(escape.utf8(request.body)),
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"wsgi.errors": sys.stderr,
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"wsgi.multithread": False,
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"wsgi.multiprocess": True,
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"wsgi.run_once": False,
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}
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if "Content-Type" in request.headers:
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environ["CONTENT_TYPE"] = request.headers.pop("Content-Type")
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if "Content-Length" in request.headers:
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environ["CONTENT_LENGTH"] = request.headers.pop("Content-Length")
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for key, value in request.headers.items():
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environ["HTTP_" + key.replace("-", "_").upper()] = value
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return environ
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def _log(self, status_code: int, request: httputil.HTTPServerRequest) -> None:
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if status_code < 400:
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log_method = access_log.info
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elif status_code < 500:
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log_method = access_log.warning
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else:
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log_method = access_log.error
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request_time = 1000.0 * request.request_time()
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assert request.method is not None
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assert request.uri is not None
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summary = (
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request.method # type: ignore[operator]
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+ " "
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+ request.uri
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+ " ("
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+ request.remote_ip
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+ ")"
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)
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log_method("%d %s %.2fms", status_code, summary, request_time)
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HTTPRequest = httputil.HTTPServerRequest
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