Mailman 3 January 2016 - Twisted

[Twisted-Python] Trying to use adoptStreamConnection and Protocol isn't being disposed
by Sirenfal Jan. 9, 2016

Jan. 9, 2016

I'm trying to pass a TCP connection to a Twisted subprocess with adoptStreamConnection, but I can't figure out how to get the Process disposed in the main process after doing that. My desired flow looks like this: - Finish writing any data the Protocol transport has waiting - When we know the write buffer is empty send the AMP message to transfer the socket to the subprocess - Dispose the Protocol instance in the main process - I tried doing nothing, loseConnection, abortConnection, and monkey patching _socketClose out and using loseConnection. See code here: http://pastebin.com/nK0Huxuj In all cases the Protocol object still exists in the main process after the socket has been transferred, even if the main process isn't listening to that socket anymore. How can I clean this up? Thanks in advance.

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[Twisted-Python] Shiji - JSON REST API Framework built with Twisted Web
by Jason J. W. Williams Jan. 7, 2016

Jan. 7, 2016

HI Guys, In case its of help to anyone, my company is open sourcing the framework we built using Twisted Web to help us build & serve JSON REST APIs: https://github.com/williamsjj/shiji We've been using it successfully for a few years and built it to solve a bunch of repetitive tasks for us: * API versioning * Signed cookie handling w/ support for key rotation. * Enforcement of required JSON arguments and validation of JSON argument datatypes. * Enforcement of required query string arguments. * Standardized JSON error responses. * Basic sanity checking of pagination arguments for API calls that support it. * Automatic generation of API documentation based on call docstrings and subclasses of our APIError super class. MIT License, so feel free to do with it as you please. If you have any questions, just let me know. Hope it's useful to someone else as well. -J

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[Twisted-Python] on template processing
by Kevin Mcintyre Jan. 4, 2016

Jan. 4, 2016

1) Is template block processing done top to bottom sequentially? I've included example.py - it's interesting that by having a blocking call first the second request is blocked, but having the blocking call after a non-blocking call the second request is not. I would've thought it would behave as a deferred list, but looking at _flattenTree and guessing not. Maybe related to wait_for_it example? 2) Is it possible for a Resource to act as an Element too? I've included a non-working elementresource.py. I'm a total hack, but I would think that if an instance had a loader attr it could be processable. 3) Is it possible to include xmlns:t=" http://twistedmatrix.com/ns/twisted.web.template/0.1" not in a tag itself? Or perhaps have a tag like 'render-block' that could be transparent-like? 4) Is it possible to have xmlns:t=" http://twistedmatrix.com/ns/twisted.web.template/0.1" in multiple places in a template? I have some cases with inline scripts that bonk out with > or < characters. This is very much related to #3. 5) Is it possible for a render element to return something like "<~sometag t:render>..." and process recursively? 6) Is there any examples of connection keep-alive long polling? 7) Examples of request based scoping would be great. All the examples on http://twistedmatrix.com/documents/13.0.0/web/howto/twisted-templates.html have flatten(None... - I've included request_scope.py 8) The wait_for_it example, is that meant as a chunked transfer example? It would be cool to have an example I could open in a browser. Trying to wrap my head around this and subviews in the meantime. Happy holidays.

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