Mailman 3 April 2015 - Twisted-web

Test
by Philippe Lafoucrière Aug. 5, 2021

Aug. 5, 2021

Hi all just a test

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web UI example for Twisted application
by Benjamin BERTRAND April 24, 2015

April 24, 2015

Hello, I have a Twisted network application that I deployed as a twistd plugin. I have different configuration files defining several parameters including some Redis pub/sub channels. Today I use a script to stop and start the plugin with the proper configuration file. I’d like to make a web UI to be able to change the configuration of the application. I already saw some people asking about that but I haven’t found any example. Could anyone point me to some examples of a Twisted application with a web UI? I have developed some Flask web app, so I think it would be easier for me to start with Klein. But I’m not against trying Nevow (Twisted docs recommend it for this purpose). Thanks Benjamin

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Client.agent - PartialDownloadError - cannot determine cause
by Chris Drane April 14, 2015

April 14, 2015

I am new with Twisted so chances are that this is *not* a bug. If that is the case, I would very much appreciate it if you help me understand what I am doing incorrectly. I have some very simple code to just download a particular page via HTTP. The problem I'm running into is that I get PartialDownloadErrors for some sites, while others load fine. And when I examine the HTTP response, it looks like the page fully downloaded. The traceback and logging information have been very unhelpful. I cannot determine what exactly is causing the error. import sys from twisted.internet.task import react from twisted.python.log import err, startLogging from twisted.web.client import Agent, BrowserLikeRedirectAgent, readBody from twisted.web.http_headers import Headers from twisted.internet import reactor from twisted.internet.ssl import ClientContextFactory def cbBody(r): print "Response body:" print r def cbRequest(response): print "Received response" d = readBody(response) d.addCallbacks(cbBody, err) return d def err(e): try: e.raiseException() except Exception, err: pass # display HTTP response # print err.response e.printTraceback() sys.stderr.write(str(e)) def main(reactor): startLogging(sys.stdout) agent = BrowserLikeRedirectAgent(Agent(reactor)) d = agent.request("GET", b"http://www.google.com", Headers({'User-Agent': ['Twisted Web Client Example']}), None) d.addCallbacks(cbRequest, err) return d react(main) 2015-04-13 14:13:11-0400 [-] Log opened. 2015-04-13 14:13:11-0400 [-] Starting factory <twisted.web.client._HTTP11ClientFactory instance at 0x10303f560> 2015-04-13 14:13:11-0400 [HTTP11ClientProtocol,client] Received response 2015-04-13 14:13:11-0400 [HTTP11ClientProtocol,client] Traceback (most recent call last): 2015-04-13 14:13:11-0400 [HTTP11ClientProtocol,client] Failure: twisted.web.client.PartialDownloadError: 200 OK 2015-04-13 14:13:11-0400 [HTTP11ClientProtocol,client] [Failure instance: Traceback (failure with no frames): <class 'twisted.web.client.PartialDownloadError'>: 200 OK 2015-04-13 14:13:11-0400 [HTTP11ClientProtocol,client] Stopping factory <twisted.web.client._HTTP11ClientFactory instance at 0x10303f560> 2015-04-13 14:13:11-0400 [-] Main loop terminated. Thanks! Chris

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Twisted 15.1 Release Announcement
by HawkOwl April 14, 2015

April 14, 2015

On behalf of Twisted Matrix Laboratories, I am honoured to announce the release of Twisted 15.1.0 -- just in time for the PyCon sprints! This is not a big release, but does have some nice-to-haves: - You can now install Twisted's optional dependencies easier -- for example, `pip install twisted[tls]` installs Twisted with TLS support. - twisted.web.static.File allows defining a custom resource for rendering forbidden pages. - Twisted's MSN support is now deprecated. - More documentation has been added on how Trial finds tests. - ...and 26 other closed tickets containing bug fixes, feature enhancements, and documentation. For more information, check the NEWS file (link provided below). You can find the downloads at <https://pypi.python.org/pypi/Twisted> (or alternatively <http://twistedmatrix.com/trac/wiki/Downloads>) . The NEWS file is also available at <https://github.com/twisted/twisted/blob/releases/release-15.1.0-7758/NEWS>. Many thanks to everyone who had a part in this release - the supporters of the Twisted Software Foundation, the developers who contributed code as well as documentation, and all the people building great things with Twisted! Twisted Regards, Hawkie Owl

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treq requests failing with twisted.web._newclient.ResponseNeverReceived
by Guido Winkelmann April 8, 2015

April 8, 2015

Hi, Recently, I have been experiencing some problems in our codebase wth treq requests failing with error messages like this: 2015-04-02 19:20:22 ERROR - pf.agent.http.client - POST http://127.0.0.1:5000/api/v1/agents/a113b5a8-9822-413b-b1fd-fce3014956cf has failed (uid: 78c7ec2a4b4d): Traceback (most recent call last): Failure: twisted.web._newclient.ResponseNeverReceived: [<twisted.python.failure.Failure <class 'twisted.internet.error.ConnectionDone'>>] Unfortunately, I have not been able to successfully produce a reduced test case that will reproduce this behaviour. It only happens under some weird set of circumstances, and I am still not sure exactly which. It appears to be highly sensitive to the order of requests. Funnily enough, this error does not show in the codebase as it is on github right now, but if I reorder some of the requests, it will show. Here is one example that has cost me some time and head-scratching: https://github.com/pyfarm/pyfarm-agent/issues/249 I think that these problems have started after upgrading to Twisted 15.0, but I'm not completely certain about this. Here is one of the methods that's affected by this: https://github.com/pyfarm/pyfarm-agent/blob/master/pyfarm/agent/service.py#… (post_direct() is just a thin wrapper over treq.request that adds some headers we need in our codebase. I have tried just using treq.request directly instead, the result was the same.) Can someone tell me under which circumstances treq.request would produce an error like this? Without actually knowing the source in question, I would guess that something in there is, for some some reason, erroneously trying to reuse a TCP connection that has already been closed. Regards, Guido W.

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