Aloha
now this is great news! I'm the one who dragged nevow over to Python3
with a lot of help from others and I'm still using nevow/athena for
multiuser card game serving. The port of nevow was never reviewed but
the code is rock stable, our servers are self hosted on FreeBSD with
server uptime measured in years.
I always wanted to replace the athena long polling with websockets but
didn't find the energy nor the time in the last few years. The nevow
framework is of course much bigger than athena but a lot of the concepts
in nevow are now firmly rooted in Twisted. This would allow peeling out
the athena/LivePage part and make it into a txAthena extension.
Is there any interest from people here to work on a lightweight option
for creating webapps with Twisted instead of dealing with the JavaScript
server side craze?
Mahalo, Werner
On 4/13/25 15:44, gl...@twistedmatrix.com wrote:
Hello friends,
The native websockets branch that I've been puttering with is now
available for review, so I'm asking for someone to review it:
https://github.com/twisted/twisted/pull/12397/files
I'm excited to get this landed and released. WebSockets are probably
the most popular and common form of bidirectional asynchronous
communication happening on the internet today, and it's been a bit of
a weakness that we don't have a simple showcase for that in Twisted.
IMAP and SSH are great to have, but they're not the _first_ thing
people go looking for these days when they're looking to do something
async.
We have of course had some access to the WebSockets world via
Autobahn, but first-party integration will have some significant
advantages:
* _We can put a WebSockets example onto our minimal-examples
showcase on twisted.org, because the example is similarly very
small, and now included with no imports from other libraries._
This is the major thing; a dozen or so lines of code illustrating
how to push data from Twisted into a browser that a user can
_immediately interact with_ is an important missing piece of the
pitch of Twisted both as a library and as a web server.
* There will be a much simpler onboarding experience to this
functionality. Autobahn is still there for anyone who wants WAMP
or XBR, but users won't be presented with those confusing concepts
when just trying to do simple server-side push.
* Since the gross private API internals that we rely upon are our
own, we don't have the version-skew problems that Autobahn does
<https://github.com/crossbario/autobahn-python/blob/7bc85b34e200640ab98a41cfddb38267f39bc92e/autobahn/twisted/resource.py#L146-L169>,
nor do we need overhead like anyio.
* Since this is a much more recent implementation it also comes with
modern niceties like coroutines rather than inlineCallbacks,
comprehensive type annotations, and 100% code coverage.
This should also be a pretty easy layup of a review:
* There is full code coverage and I believe full public API
documentation coverage.
* There's new narrative documentation
<https://twisted--12397.org.readthedocs.build/en/12397/web/howto/web-in-60/websockets.html>
explaining
how to use it.
* The protocol implementation itself is delegated to the existing,
minimal, sans-io wsproto library
<https://github.com/python-hyper/wsproto> so there's not a lot of
protocol implementation stuff to review.
* The tests are all the new, good kind (i.e.: no native sockets, no
real reactors), using IOPump (and improving that infrastructure a
bit as I passed through it), with (hopefully!) no new flakiness or
weird slowdowns.
The downside is that it _is_ brushing up against 1500 changed lines,
with most of that being additions, so it is on the longer side.
Thanks in advance for volunteering,
-g
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