SockJS python server implementation on top of Tornado framework
Project description
SockJS-tornado is a Python server side counterpart of SockJS-client browser library running on top of Tornado framework.
Simplified echo SockJS server could look more or less like:
from tornado import web, ioloop
from sockjs.tornado import SockJSRouter, SockJSConnection
class EchoConnection(SockJSConnection):
def on_message(self, msg):
self.send(msg)
if __name__ == '__main__':
EchoRouter = SockJSRouter(EchoConnection, '/echo')
app = web.Application(EchoRouter.urls)
app.listen(9999)
ioloop.IOLoop.instance().start()
(Take look at examples for a complete version).
Subscribe to SockJS mailing list for discussions and support.
SockJS-tornado API
SockJS provides slightly different API than _tornado.websocket_. Main differences are:
Depending on transport, actual client connection might or might not be there. So, there is no _self.request_ and other _tornado.web.RequestHandler_ properties.
Changed _open_ callback name to _on_open_ to be more consistent with other callbacks.
Instead of _write_message_, all messages are sent using _send_ method. Just in case, _send_ in _tornado.web.RequestHandler_ sends raw data over the connection, without encoding it.
There is handy _broadcast_ function, which accepts list (or iterator) of clients and message to send.
Settings
You can pass various settings to the _SockJSRouter_, in a dictionary:
MyRouter = SockJSRouter(MyConnection, '/my', dict(disabled_transports=['websocket']))
Deployment
sockjs-tornado properly works behind haproxy and it is recommended deployment approach.
Sample configuration file can be found here.
If your log is full of “WARNING: Connection closed by the client”, pass _no_keep_alive_ as _True_ to _HTTPServer_ constructor:
HTTPServer(app, no_keep_alive=True).listen(port)
or:
app.listen(port, no_keep_alive=True)
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