2.2 KiB
wsgi -- WSGI server
The wsgi module provides a simple an easy way to start an event-driven WSGI server. This can serve as an embedded web server in an application, or as the basis for a more full-featured web server package. One such package is Spawning.
To launch a wsgi server, simply create a socket and call eventlet.wsgi.server with
it:
from eventlet import wsgi
import eventlet
def hello_world(env, start_response):
start_response('200 OK', [('Content-Type', 'text/plain')])
return ['Hello, World!\r\n']
wsgi.server(eventlet.listen(('', 8090)), hello_world)You can find a slightly more elaborate version of this code in the
file examples/wsgi.py.
Non-Standard Extension to Support Post Hooks
Eventlet's WSGI server supports a non-standard extension to the WSGI
specification where env['eventlet.posthooks'] contains an array of post hooks that will be called after fully
sending a response. Each post hook is a tuple of (func, args, kwargs) and the
func will be called with the WSGI
environment dictionary, followed by the args and then the kwargs in the post hook.
For example:
from eventlet import wsgi
import eventlet
def hook(env, arg1, arg2, kwarg3=None, kwarg4=None):
print 'Hook called: %s %s %s %s %s' % (env, arg1, arg2, kwarg3, kwarg4)
def hello_world(env, start_response):
env['eventlet.posthooks'].append(
(hook, ('arg1', 'arg2'), {'kwarg3': 3, 'kwarg4': 4}))
start_response('200 OK', [('Content-Type', 'text/plain')])
return ['Hello, World!\r\n']
wsgi.server(eventlet.listen(('', 8090)), hello_world)The above code will print the WSGI environment and the other passed function arguments for every request processed.
Post hooks are useful when code needs to be executed after a response has been fully sent to the client (or when the client disconnects early). One example is for more accurate logging of bandwidth used, as client disconnects use less bandwidth than the actual Content-Length.
API
eventlet.wsgi