WSGI support for the Tornado web framework.
WSGI is the Python standard for web servers, and allows for interoperability between Tornado and other Python web frameworks and servers. This module provides WSGI support in two ways:
Converts a tornado.web.Application instance into a WSGI application.
Example usage:
import tornado.web
import tornado.wsgi
import wsgiref.simple_server
class MainHandler(tornado.web.RequestHandler):
def get(self):
self.write("Hello, world")
if __name__ == "__main__":
application = tornado.web.Application([
(r"/", MainHandler),
])
wsgi_app = tornado.wsgi.WSGIAdapter(application)
server = wsgiref.simple_server.make_server('', 8888, wsgi_app)
server.serve_forever()
See the appengine demo for an example of using this module to run a Tornado app on Google App Engine.
In WSGI mode asynchronous methods are not supported. This means that it is not possible to use AsyncHTTPClient, or the tornado.auth or tornado.websocket modules.
New in version 3.3.
A WSGI equivalent of tornado.web.Application.
Makes a WSGI-compatible function runnable on Tornado’s HTTP server.
Warning
WSGI is a synchronous interface, while Tornado’s concurrency model is based on single-threaded asynchronous execution. This means that running a WSGI app with Tornado’s WSGIContainer is less scalable than running the same app in a multi-threaded WSGI server like gunicorn or uwsgi. Use WSGIContainer only when there are benefits to combining Tornado and WSGI in the same process that outweigh the reduced scalability.
Wrap a WSGI function in a WSGIContainer and pass it to HTTPServer to run it. For example:
def simple_app(environ, start_response):
status = "200 OK"
response_headers = [("Content-type", "text/plain")]
start_response(status, response_headers)
return ["Hello world!\n"]
container = tornado.wsgi.WSGIContainer(simple_app)
http_server = tornado.httpserver.HTTPServer(container)
http_server.listen(8888)
tornado.ioloop.IOLoop.instance().start()
This class is intended to let other frameworks (Django, web.py, etc) run on the Tornado HTTP server and I/O loop.
The tornado.web.FallbackHandler class is often useful for mixing Tornado and WSGI apps in the same server. See https://github.com/bdarnell/django-tornado-demo for a complete example.
Converts a tornado.httputil.HTTPServerRequest to a WSGI environment.