Mailman 3 September 2006 - Twisted

[Twisted-Python] LineReceiver and setRawMode()
by jarrod roberson Sept. 7, 2006

Sept. 7, 2006

I got a simple line protocol I am trying to implement, blocks . CMD <byte count>\r\n <payload> when CMD 5\r\n is received, I setRawMode() and then inside of rawDataReceived() handle the blob the problem is when my client sends the data and the next CMD line gets eaten by the rawDataReceived() call before I can set it back to lineMode(). so for something like CMD 5\r\n abcde CMD 10\r\n abcdefghij after I get CMD 5\r\n setRawMode() inside rawDataReceived(data) data = abcdeCMD … [View More]

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Re: [Python-Dev] [Twisted-Python] Newbie question
by Timothy Fitz Sept. 7, 2006

Sept. 7, 2006

On 9/7/06, Jean-Paul Calderone <exarkun(a)divmod.com> wrote: > One could just as easily ask why no one bothers to read mailing list > archives to see if their question has been answered before. Is there a technical reason why they can't? If not I'm opening up a bug on it.

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[Twisted-Python] Newbie question
by Stan Benrsteen Sept. 7, 2006

Sept. 7, 2006

Gentlemen: I am trying to use the twisted perspective broker in a client that repeatedly makes remote calls to a twisted server. I'm running a MAC OS X. I create a client object, which calls reactor.connectTCP(), builds the deferred object to make the remote call, calls reactor.run(). A deferred callback eventually reactor.stop() and returns the correct answer. Now I need to do this again, so I create a new client object, etc., which goes through the same procedure and … [View More]

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[Twisted-Python] Multiple client connections
by Stan Benrsteen Sept. 6, 2006

Sept. 6, 2006

All, I want to write a client that connects to a Twisted Server using pb. I want my client to make several connections. For example: from twisted.spread import pb from twisted.internet import defer from twisted.internet.tcp import Connector from twisted.internet import reactor PORT = 8992 class ModelCalculator: def __init__(self, host, port): self.host = host self.port = port def add(self, a, b): self.factory = pb.PBClientFactory() deferred =… [View More]

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[Twisted-Python] PB auth with LDAP
by Marvin McNett Sept. 4, 2006

Sept. 4, 2006

Hi, Just noticed that PB's _PortalAuthChallenger implements IUsernameHashedPassword, IUsernameMD5Passwordauth, but not IUsernamePassword. This requires that I store my passwords in plain text or MD5 hash, then fetch the password to do a comparison at login. However, this is inconvenient when storing passwords in LDAP. First, LDAP doesn't like returning passwords (Unless you're requesting it as the database administrator). Second, storing passwords in plain text or even as MD5 hashes … [View More]

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[Twisted-Python] callLater
by Manlio Perillo Sept. 4, 2006

Sept. 4, 2006

Hi. I need to implement a function for scheduling function calls at specific times. A simple implementation is: def callAt(when): from twisted.internet import reactor delta = when - datetime.now() delay = delta.days * 24 * 3600 + delta.seconds + delta.microseconds / 1000000. return reactor.callLater(delay) However I'm going to have lots of this scheduled calls, many of these are far away in the future. Can this be a problem? An alternative implementation is to use … [View More]

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com Sept. 3, 2006

Sept. 3, 2006

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[Twisted-Python] twisted rpm
by Jorge Sepúlveda Pereda Sept. 2, 2006

Sept. 2, 2006

Hi, i need to know, if there are, a twisted install RPM for Fedora linux ( FC4) . Thanks. (sorry for my english) Jorge.

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[Twisted-Python] Data management in a Twisted application
by Robert Gravina Sept. 2, 2006

Sept. 2, 2006

Twisted and Divmod lists, Sorry about the cross posting here - this is mainly a Twisted question but it involves Divmod Axiom a little too. I'm looking for some advice about the best way to implement data management in my application. The way I see it, there is a "client does almost everything" approach, and "server does almost everything" approach. I'd currently using the former, but I'd like to hear some opinions about switching to the latter, or if there is a better approach … [View More]you can think of. Here are the approaches as I see them: --- 1) Client does almost everything approach When the user logs on they get a Cacheable, which contains a list of Copyable objects that they will be able to add/edit/delete. These objects are quite complex (have list of other objects etc.). There is a main screen which lists the objects details. The user can select a row, and they get a form where that can edit all the various attributes (obviously much more than is displayed on the list on the main screen), and save it to the server. The server calls an update method which essentially copies across all the attributes to the server-side Axiom Item instance which it represents . Using the Cacheable previously mentioned, it notifies all clients that an object has been updated and sends them this updated object. Adding new objects works in a similar way. Problems arise with things like delete - I'd really need to set a flag on the server-side object when someone has it open, so that I can inform other users they can't delete it. At some point I'd like to implement searching on the main interface, so the users can filter their list of objects. This would require me to build up boolean search criteria and roll my own search using the lists of objects. 2) Sever does almost everything When the user logs on they get a Cacheable again, but this time the list is just a summary of the objects attributes, enough to populate the main screen list. When the user edits a row, the client requests the Cacheable from the server it represents (not a Copyable anymore). When they save, they sent the Cacheable back to the server (is this possible I wonder?) and copy accross all the data like before, and update the clients by sending them new summary data for that object (but not the object itself). I hope, it's possible to stop observing the object too. That way, on the server I could maintain a list of who has the object open at the moment. For searching, now that all the objects live on the server I could send my boolean search criteria and use Axiom's search facilities to so a proper database search. This saves my rolling me own. Also, another bonus of this approach is if Axiom one day supports Live Queries (maybe I can help implement this when I get the bulk of this app done) I can update the clients when their query results changes! --- However, it's expected the users will be searching often, so there's something to be said about having all the data close at hand on the client. Obviously, this has drawbacks too. Aside from having to implement my own search, I'm worried this might mean having thousands of objects locally might be a memory hog (but premature optimisation is the root of all evil, so I'll worry about this later). The search might by faster since there's no need to ask the server to do it, but since server-side search is probably going to be much faster than my client side search, it's hard to estimate which will be faster. Anyway, I hope the issues here and my implementation makes sense. I'm torn between which approach to take, and I'd really appreciate some advice. Robert [View Less]

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[Twisted-Python] unable to install twisted
by Fritz Platzke Sept. 2, 2006

Sept. 2, 2006

Hello, I hate asking questions like this but quite frankly I'm stumped. I have been trying to install Twisted for the past two days and it just won't go. I've tried multiple versions of Zope and Twisted but nothing seems to work. The box I am attempting the install is a fresh install of CentOS 4.4 on an Intel Celeron 733 mhz processor [root@milky ~]# gcc -v Reading specs from /usr/lib/gcc/i386-redhat-linux/3.4.6/specs Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --… [View More]infodir=/usr/share/info --enable-shared --enable-threads=posix --disable-checking --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-java-awt=gtk --host=i386-redhat-linux Thread model: posix gcc version 3.4.6 20060404 (Red Hat 3.4.6-3) [root@milky ~]# python -V Python 2.3.4 This is what happens when I attempt to build zope... running build running build_py running build_ext building 'zope.interface._zope_interface_coptimizations' extension gcc -pthread -fno-strict-aliasing -DNDEBUG -O2 -g -pipe -m32 -march=i386 -mtune=pentium4 -D_GNU_SOURCE -fPIC -fPIC -IDependencies/zope.interface-ZopeInterface-3.1.0c1/zope.interface -I/usr/include/python2.3 -c Dependencies/zope.interface-ZopeInterface-3.1.0c1/zope.interface/_zope_interface_coptimizations.c -o build/temp.linux-i686-2.3/Dependencies/zope.interface-ZopeInterface-3.1.0c1/zope.interface/_zope_interface_coptimizations.o Dependencies/zope.interface-ZopeInterface-3.1.0c1/zope.interface/_zope_interface_coptimizations.c:15:20: Python.h: Nosuch file or directory Dependencies/zope.interface-ZopeInterface-3.1.0c1/zope.interface/_zope_interface_coptimizations.c:16:26: structmember.h: No such file or directory Dependencies/zope.interface-ZopeInterface-3.1.0c1/zope.interface/_zope_interface_coptimizations.c:22: error: syntax error before '*' token Dependencies/zope.interface-ZopeInterface-3.1.0c1/zope.interface/_zope_interface_coptimizations.c:22: warning: data definition has no type or storage class Dependencies/zope.interface-ZopeInterface-3.1.0c1/zope.interface/_zope_interface_coptimizations.c:23: error: syntax error before '*' token Dependencies/zope.interface-ZopeInterface-3.1.0c1/zope.interface/_zope_interface_coptimizations.c:23: warning: data definition has no type or storage class Dependencies/zope.interface-ZopeInterface-3.1.0c1/zope.interface/_zope_interface_coptimizations.c:24: error: syntax error before '*' token ... ... etc ... ... error: command 'gcc' failed with exit status 1 Now I realize that I could probably ask for help on the Zope list but seeing as how a person NEEDS zope in order to install twisted I'm hoping someone here has experienced similar issues and can provide some insight into what I'm missing and/or doing wrong. Surely someone running either CentOS or RHEL has encountered this problem and can explain what is going on. Thanks in advance, Fritz [View Less]

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[Twisted-Python] strports.service, ssl and forcing client certs
by Phil Mayers Sept. 1, 2006

Sept. 1, 2006

I want a line-oriented protocol to listen on an SSL port, and I want client certificate authentication for this. How do I specify this: strports.service('ssl:4443:privateKey=key.pem:certKey=cert.pem:clientCert=must') ...or similar?

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