Mailman 3 September 2003 - Twisted

[Twisted-Python] Patch to allow deferreds to be returned from resource.render
by James Y. Knight Sept. 15, 2003

Sept. 15, 2003

Ooh lets try sending this mail one more time. Apparently the combined suckage of three different programs made my last mail not get through: 1) Apple Mail sucks and doesn't quote the "Full Name" automatically, so I end up with a non-RFC-conforming From: with a "." outside of quotes or the email address. 2) Exim sucks and doesn't fix it (OTOH, Sendmail does fix it, which is why i've never seen this problem before!) 3) Mailman sucks as well, and gets completely confused by this slightly non-… [View More]conformant address format, and thinks my email address is "jamesy.knight". Anyways, on to the original message: === This patch lets you return a deferred from resource.render (the obvious thing to do) and have it work. As opposed to the current method where you need to return NOT_DONE_YET and restructure all your code to call request.write(...). That should still work too, though. I'd stick this on the bug tracker but I forgot my password. (anyone able to reset for me? :) James --- server.py~ Mon Jul 21 00:09:52 2003 +++ server.py Tue Sep 9 15:02:09 2003 @@ -160,56 +160,8 @@ except: self.processingFailed(failure.Failure()) - - def render(self, resrc): - try: - body = resrc.render(self) - except UnsupportedMethod, e: - allowedMethods = e.allowedMethods - if (self.method == "HEAD") and ("GET" in allowedMethods): - # We must support HEAD (RFC 2616, 5.1.1). If the - # resource doesn't, fake it by giving the resource - # a 'GET' request and then return only the headers, - # not the body. - log.msg("Using GET to fake a HEAD request for %s" % - (resrc,)) - self.method = "GET" - body = resrc.render(self) - - if body is NOT_DONE_YET: - log.msg("Tried to fake a HEAD request for %s, but " - "it got away from me." % resrc) - # Oh well, I guess we won't include the content length. - else: - self.setHeader('content-length', str(len(body))) - - self.write('') - self.finish() - return - - if self.method in (supportedMethods): - # We MUST include an Allow header - # (RFC 2616, 10.4.6 and 14.7) - self.setHeader('Allow', allowedMethods) - s = ('''Your browser approached me (at %(URI)s) with''' - ''' the method "%(method)s". I only allow''' - ''' the method%(plural)s %(allowed) here.''' % { - 'URI': self.uri, - 'method': self.method, - 'plural': ((len(allowedMethods) > 1) and 's') or '', - 'allowed': string.join(allowedMethods, ', ') - }) - epage = error.ErrorPage(http.NOT_ALLOWED, - "Method Not Allowed", s) - body = epage.render(self) - else: - epage = error.ErrorPage(http.NOT_IMPLEMENTED, "Huh?", - """I don't know how to treat a""" - """ %s request.""" - % (self.method)) - body = epage.render(self) - # end except UnsupportedMethod - + def _cbRender(self, body, resrc): + if body == NOT_DONE_YET: return if type(body) is not types.StringType: @@ -232,6 +184,58 @@ self.setHeader('content-length', str(len(body))) self.write(body) self.finish() + + def _ebRender(self, failure, resrc): + failure.trap(UnsupportedMethod) + e = failure.value + allowedMethods = e.allowedMethods + if (self.method == "HEAD") and ("GET" in allowedMethods): + # We must support HEAD (RFC 2616, 5.1.1). If the + # resource doesn't, fake it by giving the resource + # a 'GET' request and then return only the headers, + # not the body. + log.msg("Using GET to fake a HEAD request for %s" % + (resrc,)) + self.method = "GET" + body = resrc.render(self) + + if body is NOT_DONE_YET: + log.msg("Tried to fake a HEAD request for %s, but " + "it got away from me." % resrc) + # Oh well, I guess we won't include the content length. + else: + self.setHeader('content-length', str(len(body))) + + self.write('') + self.finish() + return + + if self.method in (supportedMethods): + # We MUST include an Allow header + # (RFC 2616, 10.4.6 and 14.7) + self.setHeader('Allow', allowedMethods) + s = ('''Your browser approached me (at %(URI)s) with''' + ''' the method "%(method)s". I only allow''' + ''' the method%(plural)s %(allowed) here.''' % { + 'URI': self.uri, + 'method': self.method, + 'plural': ((len(allowedMethods) > 1) and 's') or '', + 'allowed': string.join(allowedMethods, ', ') + }) + epage = error.ErrorPage(http.NOT_ALLOWED, + "Method Not Allowed", s) + body = epage.render(self) + else: + epage = error.ErrorPage(http.NOT_IMPLEMENTED, "Huh?", + """I don't know how to treat a""" + """ %s request.""" + % (self.method)) + body = epage.render(self) + + def render(self, resrc): + defer.maybeDeferred(resrc.render, self).addErrback(self._ebRender, resrc).addCallback(self._cbRender, resrc).addErrback(self.processingFailed) + + def processingFailed(self, reason): log.err(reason) [View Less]

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[Twisted-Python] Re: Web server with Python
by Andrew Bennetts Sept. 14, 2003

Sept. 14, 2003

[CC'ing the Twisted mailing list] On Fri, Sep 12, 2003 at 08:05:59PM +0200, Patrick Useldinger wrote: > On Fri, 12 Sep 2003 17:33:34 +1000, Andrew Bennetts > <andrew-pythonlist(a)puzzling.org> wrote: > > >> Does Twisted work well with Python 2.3? > > > >Yes, current versions support 2.3 without any problems. > > Version 1.0.6 refuses to install, though, complaining it requires Python > 2.2. Eek! Does 1.0.7 (just released) work any better? Also, … [View More]

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[Twisted-Python] Please add changelog entry for all resolved issues in bug tracker
by Itamar Shtull-Trauring Sept. 14, 2003

Sept. 14, 2003

This will make sure changelog is more up to date and allow people reading changelog to refer to issue tracker. -- Itamar Shtull-Trauring http://itamarst.org/ Available for Python & Twisted consulting

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[Twisted-Python] Examples and patterns for Twisted
by Dave Kuhlman Sept. 13, 2003

Sept. 13, 2003

I've written a document that provides and explains a number of patterns and examples for Twisted Web applications. I'm hoping that it might be of help to beginning Twisted developers. I also wrote it to try to learn more about Twisted and also to straight out my own head. I'd like to post it at my Web site. But, before I make it public or announce it, it'd be helped by reviews from Twisted experts. Any comments and suggestions would be appreciated. You can find it at: http://www.rexx.… [View More]

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[Twisted-Python] Suspending a result
by Uwe C. Schroeder Sept. 13, 2003

Sept. 13, 2003

Hi, maybe I'm sitting on my brains here, but anyways: I have a (possibly) blocking function. The core work of it is handled in a separate thread, so the blocking is not a problem for Twisted. However - I need to get rid of the deferred callbacks. So basically what I'm trying to do is to have a class/method that wraps the blocking code WITHOUT returning a deferred. Instead I'd like to "suspend" the return, certainly without blocking twisted. So here is some "pseudocode" to clarify what I … [View More]

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[Twisted-Python] and thanks to radix, hypatia, exarkun and glyph
by Itamar Shtull-Trauring Sept. 13, 2003

Sept. 13, 2003

Mary Gardiner, for hosting our mail Chris Armstrong, who did lots of work on the move Jean-Paul Calderone, assembling and bringing server to hosting Glyph Lefkowitz, buying us a new server -- Itamar Shtull-Trauring http://itamarst.org/ Available for Python & Twisted consulting

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[Twisted-Python] A big thank you to Divmod and Tummy
by Itamar Shtull-Trauring Sept. 13, 2003

Sept. 13, 2003

1. Tummy.com has donated CVS hosting on their wonderful virtual hosting setup (hosting.tummy.com). You should try them out, they are a great company. 2. Divmod (www.divmod.com) have donated rack space, bandwidth etc. for our main server's new home. You should all try out Quotient and send them patches and bug reports. -- Itamar Shtull-Trauring http://itamarst.org/ Available for Python & Twisted consulting

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[Twisted-Python] Who runs FreeBSD and Mac OS X buildbots?
by Itamar Shtull-Trauring Sept. 13, 2003

Sept. 13, 2003

Warner has coded new bandwidth saving version of buildbot. Please don't switch to new CVS server until you've upgraded to using it. -- Itamar Shtull-Trauring http://itamarst.org/ Available for Python & Twisted consulting

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[Twisted-Python] executing .rpy in a thread
by stephan Sept. 13, 2003

Sept. 13, 2003

Say I want to execute blocking code in a .rpy file. Can't I just execute all the code in a separate thread? I've found the following code to execute a function in a thread. How could I add a callback to that thread so I could get back the whole html page back from that "notthreadSafe" function and return it to the client (web browser)? from twisted.internet import reactor from twisted.python import threadable threadable.init(1) def notThreadSafe(x): """do something that isn't thread-… [View More]

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[Twisted-Python] calling unix commands
by Konrad Rokicki Sept. 13, 2003

Sept. 13, 2003

Hey everyone, I'm having a problem calling a unix comand from inside a twisted program.. I do os.popen(cmd).readlines() and I sporadically get: IOError: [Errno 4] Interrupted system call Sounds like it might be an async problem.. is there a preferred way to do this in twisted? Thanks, Konrad

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