Mailman 3 January 2011 - Twisted

Re: [Twisted-Python] Boston Area Mini-Sprint
by Andrew Francis Jan. 15, 2011

Jan. 15, 2011

Hi Folks: > Message: 1 > Date: Thu, 13 Jan 2011 12:32:08 -0500 > From: Tenth <tenth(a)twistedmatrix.com> > Subject: [Twisted-Python] Boston Area Mini-Sprint > To: Twisted general discussion <twisted-python(a)twistedmatrix.com> > Message-ID: > > <AANLkTim0WuyPW219MH+cxXJuKi1WVvBSiCZOW+sJogqc(a)mail.gmail.com> > Content-Type: text/plain; charset="iso-8859-1" > > Apologies in advance for the short notice, but I'm planning > … [View More]

2 1

[Twisted-Python] Boston Area Mini-Sprint
by Tenth Jan. 14, 2011

Jan. 14, 2011

Apologies in advance for the short notice, but I'm planning to host a Boston area Twisted mini-sprint this weekend on Sunday, January 16th. Space is fairly limited (hence the mini- prefix), but if you're on twisted-python and would be interested in the details of this and/or future Boston area sprints, let me know, and I'll add you to the invitation. Thanks, - Dave

4 6

[Twisted-Python] Pantheon sponsorship logo
by David Strauss Jan. 13, 2011

Jan. 13, 2011

Hi Twisters, I recently sent in a $1000/silver sponsorship to the Twisted project from Pantheon Systems, my new company. For the sponsor listing, I've attached a logo with the specified dimensions. Please link to our home page [1]. Thanks, and happy 2011. [1] http://getpantheon.com/ -- David Strauss | david(a)getpantheon.com | +1 512 577 5827 [mobile] Pantheon Systems | http://getpantheon.com/

3 2

Re: [Twisted-Python] Twisted-Python Digest, Vol 82, Issue 12
by williem75＠gmail.com Jan. 13, 2011

Jan. 13, 2011

Sent from my LG phone twisted-python-request(a)twistedmatrix.com wrote: >Send Twisted-Python mailing list submissions to > twisted-python(a)twistedmatrix.com > >To subscribe or unsubscribe via the World Wide Web, visit > http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python >or, via email, send a message with subject or body 'help' to > twisted-python-request(a)twistedmatrix.com > >You can reach the person managing the list at > twisted-python-owner(a)… [View More]twistedmatrix.com > >When replying, please edit your Subject line so it is more specific >than "Re: Contents of Twisted-Python digest..." > > >Today's Topics: > > 1. Re: client connecting to 2 servers (nonsimultaneously) > (benjamin.bertrand(a)lfv.se) > 2. Re: client connecting to 2 servers (nonsimultaneously) > (Jason Rennie) > 3. Re: client connecting to 2 servers (nonsimultaneously) > (exarkun(a)twistedmatrix.com) > 4. Re: client connecting to 2 servers (nonsimultaneously) > (Jason Rennie) > 5. Re: client connecting to 2 servers (nonsimultaneously) > (Glyph Lefkowitz) > > >---------------------------------------------------------------------- > >Message: 1 >Date: Wed, 12 Jan 2011 09:49:34 +0000 >From: <benjamin.bertrand(a)lfv.se> >Subject: Re: [Twisted-Python] client connecting to 2 servers > (nonsimultaneously) >To: <twisted-python(a)twistedmatrix.com> >Message-ID: <2C9A58914594E34AA28179DB776FABDF92E4(a)xw-exch04.lfv.se> >Content-Type: text/plain; charset="iso-8859-1" > >One small question about the following code: >Why did you use reactor.callWhenRunning in the __init__ method? >Why not calling directly reactor.connectTCP? > >Cheers, > >Benjamin > >Fr?n: twisted-python-bounces(a)twistedmatrix.com [mailto:twisted-python-bounces@twistedmatrix.com] F?r Jason Rennie >Skickat: den 11 januari 2011 14:11 >Till: Twisted general discussion >?mne: Re: [Twisted-Python] client connecting to 2 servers (nonsimultaneously) > >You could probably generalize and simplify by using a collections.deque of hosts/ports and using the rotate() method before each?reactor.connectTCP. ?Also, no need for multiple reactor imports---one at the top of the code is fine. ?Note that if the connection is "lost" in a non-clean fashion, you may also want to reconnect. ?IIUC, "fail" only handles the case that no connection is made (protocol is never created). > >import collections >from twisted.internet import reactor > >class MyClientFactory(object): >?? ?protocol = MyClientProtocol >?? ?def __init__(self, hosts): >?? ? ? ?self.hosts = collections.deque(hosts) >?? ? ? ?reactor.callWhenRunning(reactor.connectTCP, self.hosts[0][0], self.hosts[0][1], self) >?? ? ? ?self.hosts.rotate(1) >?? ?def clientConnectionFailed(self, connector, reason): >?? ? ? ?reactor.callLater(2.0, connectTCP, self.hosts[0][0], self.hosts[0][1], self) >?? ? ? ?self.hosts.rotate(1) > >factory = MyClientFactory([('host1', port1), ('host2', port2), ...]) >reactor.run() > >Cheers, > >Jason > >On Tue, Jan 11, 2011 at 5:17 AM, <benjamin.bertrand(a)lfv.se> wrote: >Hi, > >I'm new to twisted and I have started to write a new protocol with a TCP >client and server. >In my protocol, a client should be able to connect to 2 servers >(master/slave node - only the master accepts connection). >The client should try to connect to server1. If it fails, try to connect >to server2 (after a specific timeout). If that fails, try server1... >I came up with a solution (see below). >As I'm new to twisted and I haven't seen anything like that in the >examples, I'd like to check if that's a proper way to do it. >Any comments is welcome. > >Thanks > >Benjamin > >*********************************************** >class MyClientFactory(ClientFactory): > >? ?protocol = MyClientProtocol > >? ?def __init__(self, host2=None): >? ? ? ?self.host1 = None >? ? ? ?self.host2 = host2 > >? ?def clientConnectionFailed(self, connector, reason): >? ? ? ?from twisted.internet import reactor >? ? ? ?if self.host2 is None: >? ? ? ? ? ?# host2 is not defined, reconnect to host1 >? ? ? ? ? ?reactor.callLater(2.0, connector.connect) >? ? ? ?else: >? ? ? ? ? ?destination = connector.getDestination() >? ? ? ? ? ?if self.host1 is None: >? ? ? ? ? ? ? ?# First connection failed, initialize host1, and try >host2 >? ? ? ? ? ? ? ?self.host1 = destination.host >? ? ? ? ? ? ? ?host = self.host2 >? ? ? ? ? ?elif destination.host == self.host1: >? ? ? ? ? ? ? ?# Connection to host1 failed, try host2 >? ? ? ? ? ? ? ?host = self.host2 >? ? ? ? ? ?else: >? ? ? ? ? ? ? ?# Connection to host2 failed, try host1 >? ? ? ? ? ? ? ?host = self.host1 >? ? ? ? ? ?reactor.callLater(2.0, reactor.connectTCP, host, >destination.port, self) > > >factory = MyClientFactory(server2) >from twisted.internet import reactor >reactor.connectTCP(server1, 8010, factory) >reactor.run() >*********************************************** > > >_______________________________________________ >Twisted-Python mailing list >Twisted-Python(a)twistedmatrix.com >http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python > > > >-- >Jason Rennie >Research Scientist, ITA Software >617-714-2645 >http://www.itasoftware.com/ > > > >------------------------------ > >Message: 2 >Date: Wed, 12 Jan 2011 10:15:59 -0500 >From: Jason Rennie <jrennie(a)gmail.com> >Subject: Re: [Twisted-Python] client connecting to 2 servers > (nonsimultaneously) >To: Twisted general discussion <twisted-python(a)twistedmatrix.com> >Message-ID: > <AANLkTi=ge7JGPY3_woNu6LCapUEXjH88pRZ=TB05g5dY(a)mail.gmail.com> >Content-Type: text/plain; charset="iso-8859-1" > >Habit, mostly. I think it's a good habit, though. The reason is that I >wanted to make sure the __init__ code completed before the connectTCP was >called. In this case, it doesn't matter, but if I had a number of things I >wanted to do in __init__, it might matter. Consider: > >class MyClientProtocol(Protocol): > def connectionMade(self): > self.factory.numConnections += 1 > >class MyClientFactory(Factory): > def __init__(self): > reactor.connectTCP(host, port, self) > self.numConnections = 0 > >'course, I'm sure you'd put reactor.connectTCP *after* the numConnections >initializer, but using callWhenRunning ensures that the order doesn't >matter, so it's one less thing you have to worry about :-) > >Jason > >On Wed, Jan 12, 2011 at 4:49 AM, <benjamin.bertrand(a)lfv.se> wrote: > >> One small question about the following code: >> Why did you use reactor.callWhenRunning in the __init__ method? >> Why not calling directly reactor.connectTCP? >> >> Cheers, >> >> Benjamin >> >> >-- >Jason Rennie >Research Scientist, ITA Software >617-714-2645 >http://www.itasoftware.com/ > [View Less]

1 0

[Twisted-Python] client connecting to 2 servers (non simultaneously)
by benjamin.bertrand＠lfv.se Jan. 13, 2011

Jan. 13, 2011

Hi, I'm new to twisted and I have started to write a new protocol with a TCP client and server. In my protocol, a client should be able to connect to 2 servers (master/slave node - only the master accepts connection). The client should try to connect to server1. If it fails, try to connect to server2 (after a specific timeout). If that fails, try server1... I came up with a solution (see below). As I'm new to twisted and I haven't seen anything like that in the examples, I'd like to check if … [View More]

6 14

[Twisted-Python] Twisted and ICP protocol
by Roberto Franchesco Jan. 11, 2011

Jan. 11, 2011

Hello All, I have been trying to get a squid proxy to "talk" to a twisted proxy and I came across an old email from this list where someone mentioned that they had implemented a basic ICP protocol in twisted. Does anyone still have that implementation? Or any good pointers on setting me off in the right direction as to how to do this? -Rob

2 1

[Twisted-Python] Twisted and PEP 3148 support
by Alex Grönholm Jan. 11, 2011

Jan. 11, 2011

There has been some discussion over email between myself and several Twisted developers regarding the possibility of adding support for PEP 3148 futures and executors to Twisted. I'm starting this thread to move the conversation to this mailing list to gain a broader audience. For those who do not know what PEP 3148 is about, suffice to say that it's an API for deferred execution of code. The reference implementation can be found in the Python 3.2 standard library under the package name … [View More]

5 9

[Twisted-Python] Want something fixed?
by exarkun＠twistedmatrix.com Jan. 10, 2011

Jan. 10, 2011

Hi all, I'd like someone to do a review on #4395 - a ticket about some conch key exchange bugs. The branch isn't very large, a little under 500 lines of diff (with nearly a hundred of those deletions). In exchange for a thorough review (and perhaps a re-review if issues are found which need to be fixed), I'd be happy to spend as much as a full day working on some other issue of the reviewer's choice. Thanks, Jean-Paul

2 2

[Twisted-Python] Twisted Names - strange RuntimeError
by Angelo Dell'Aera Jan. 9, 2011

Jan. 9, 2011

Hi, while developing a code based on Twisted Names I'm finding myself catching RuntimeErrors like the one reported below. 2011-01-09 10:32:13+0100 [twisted.names.dns.DNSDatagramProtocol (UDP)] Unhandled Error Traceback (most recent call last): File "/usr/lib64/python2.6/site-packages/twisted/python/log.py", line 84, in callWithLogger return callWithContext({"system": lp}, func, *args, **kw) File "/usr/lib64/python2.6/site-packages/twisted/python/log.py", line 69, in callWithContext … [View More]

4 6

[Twisted-Python] Amazon AWS, Google app engine and Twisted
by Pandelis Theodosiou Jan. 9, 2011

Jan. 9, 2011

This may be a dumb question but I'll make it anyway: Is it possible to use Amazon AWS or Google app engine as a hosting envirorment for a Twisted application? Pandelis <http://int.ask.com/web?siteid=10000861&webqsrc=999&l=dis&q=ask%20>

2 1

[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com Jan. 9, 2011

Jan. 9, 2011

1 0

[Twisted-Python] multicast
by Pandelis Theodosiou Jan. 5, 2011

Jan. 5, 2011

I'm trying to make a Multicast client. I've tried the simple script found in: http://twistedmatrix.com/documents/10.1.0/core/howto/udp.html#auto3 While it shows no errors, it doesn't receive any data. How can I check what the problem is? It runs on a Debian 64-bit machine where I've installed Python2.6 and Twisted 10.0.2.0 Could it be some firewall setting? Is it possible I've somehow screwed with the installation procedure? Pandelis from twisted.internet.protocol import DatagramProtocol … [View More]

4 8

[Twisted-Python] job server project
by Umut Aydin Jan. 4, 2011

Jan. 4, 2011

Hello everybody I just completed an article about writing a job server with Twisted Framework. It's also based on my job server project called Jobbar. http://umut.mobi/blog/2010/12/31/jobbar-distributed-job-server/ I'm still working on it. Happy new year. - Umut

4 7

[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com Jan. 2, 2011

Jan. 2, 2011

1 0

[Twisted-Python] twcgi duplicate Content-Type
by Laurens Van Houtven Jan. 1, 2011

Jan. 1, 2011

Hi! I'm using twcgi to serve a Fossil repository through CGI (it's that or xinetd). For some reason, Chrome wasn't rendering the CSS. Looking at the HTTP response headers for the GET request for the CSS file, I saw this: HTTP/1.1 200 OK Date: Sat, 01 Jan 2011 00:14:58 GMT Content-Length: 13484 Expires: Sat, 8 Jan 2011 00:14:58 GMT Content-Type: text/html Content-Type: text/css; charset=utf-8 Server: TwistedWeb/10.2.0 I'm pretty sure duplicate Content-Type headers aren't supposed to happen. … [View More]

1 2