On 12/03/2014 08:53, Laurens Van Houtven wrote:
Twisted has a thing called Cyclone, which I hear (but that's only
hearsay) gives you Tornado's API on top of twisted, so you get all of
the stuff below for free.
From my side, I'm looking to experimentally build a network testing
tool that will need to speak a fair few protocols, both classic tcp
and multicast-based, and have a web api living on top of it that
most likely will have a websocket for pumping data to the browser.
It'll also need to write out JUnit-compatible xml results, but
that's like the easiest bit ;-)
I don't know which protocols you are interested in specifically;
Aiming low (insert sarcastic look here), here's the first few:
http://cdn.batstrading.com/resources/participant_resources/BATS_Europe_FIX_Specification.pdf
http://cdn.batstrading.com/resources/participant_resources/BATS_Europe_Binary_Order_Entry_Specification.pdf
http://cdn.batstrading.com/resources/participant_resources/BATS_Europe_PITCH_Specification.pdf
http://cdn.batstrading.com/resources/participant_resources/BATS_Europe_MC_PITCH_Specification.pdf
Twisted has a third party project called txsockjs which works
excellently, both by itself and in the context of other (HTTP)
resources. sockjs is a protocol which is basically "websockets, damnit",
even when the consumer is a bad browser like IE6.
Thankfully, I only have to support sane browsers...
Twisted comes with a threadpool-backed WSGI server. (When I say
threadpool-backed I mean that the WSGI requests are handled in threads;
the IO itself of course comes from the Twisted reactor).
Yeah, I remember that, and I remember liking it :-)
I find twisted to be a great tool for writing protocol implementations.
I have written tools for querying all sorts of gnarly proprietary
protocols over all sorts of gnarly transports (packet radio; it's
totally a thing), and more recently for doing crazy things like
multiplexing stream transports over existing RPC protocols. (Like, you
see a local port come up, and that actually creates a virtual stream
connection over an existing RPC thing to some virtual server on the
other end of the wire: https://www.youtube.com/watch?v=W_jEIvugwes).
Cool!
Twisted has had so many people write so many protocols in it that also
the testing tools (MemoryReactor, StringTransport) are great. Especially
if you are writing something very close to a wire protocol you will
undoubtedly enjoy those amenities. There's also tons of composable
things for receiving delimited lines, nestrings, etc. It's hard to tell
what you will be looking for since I don't know details about your
protocol, but having written more than a few protocol implementations
I'm going to wager a guess and say Twisted has it or a third party thing
for twisted has it.
Yep, certainly sounds good. I guess I have concerns about
discoverability and making sure I'm picking the right things to use
rather than re-implementing things when I don't need to.
What's the best way for me to find things I should be using? I guess my
fallback position is to ask lots of clueless questions on this list and
hope I don't annoy to many people, is that viable?
Twisted, emphatically and without reservation, for all the above
reasons. It's stable. All the stuff you need has been tried and tested
extensively in production. It runs on PyPy, and usually a damn sight
faster than on CPython, too.
Didn't know about the PyPy thing, that will be interesting if I ever hit
performance problems...
A common criticism of Twisted is that it "takes over" your codebase. I
am speaking at PyCon in about a month to demonstrate that that isn't
true. (It just looks that way, because once people use it, they don't
want to go back... ;-))
Gutted I can't make it to PyCon this year, look forward to watching the
video!
Chris
--
Simplistix - Content Management, Batch Processing & Python Consulting
- http://www.simplistix.co.uk
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