Mailman 3 June 2006 - Twisted

[Twisted-Python] ANNOUNCE: Zenoss-0.20.1
by Erik Dahl 30 Jun '06

30 Jun '06

Version 0.20.1 of Zenoss is available for download. This version fixes several issues, upgrades to Twisted-2.4 and adds finer grained monitoring control on device components such as: IpInterfaces, FileSystems, and HardDisks. Project Home: http://www.zenoss.org/ To download: http://www.zenoss.org/download Release Notes: http://dev.zenoss.org/trac/wiki/zenoss-0.20 ----------- Project Blurb: Zenoss is a GPL licensed enterprise grade monitoring system that provides Inventory/Configuration, Event, Performance and Availability management in a single integrated package. It is written in Python using the Zope web application framework and Twisted network programming environment. Zenoss is designed to be easy to use for a beginner yet flexible and powerful enough for the advanced user Enjoy, -EAD Erik Dahl

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[Twisted-Python] Twisted - tutorial links
by The Wiz 29 Jun '06

29 Jun '06

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I want to try Twisted. any links to tutorials? and when I say "tutorials", I mean MORE THAN ONE tutorial. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2.2 (GNU/Linux) iD8DBQFEoqkUA7t0hsXXeiERAsu/AKClQF2bHLnBNADznV90+rRV+Ze85ACfULkc 8XphES8v5v4whipvNw5fj5k= =6XkZ -----END PGP SIGNATURE-----

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[Twisted-Python] can pb.Copyable objects be compared for equality after a round trip?
by Robert Gravina 28 Jun '06

28 Jun '06

Twisted-list, In an application I'm writing I would like all Perspective Broker clients to share some list of objects and have them all keep in sync when one of the clients updates an object's attributes (imagine say a shared address book - I'm not creating an address book, but it's easier than explaining the details of my app). I've created a pb.Cacheable class for the purposes of notifying clients when new objects are added to this list which works fine (I based this on the cache_classes.py example from the docs here <http://twistedmatrix.com/ projects/core/documentation/howto/pb-copyable.html>). Where I am having trouble is with round trip editing these objects (which are all both pb.Copyable and pb.RemoteCopy - I did this so that I wouldn't have problems of accidentally storing a RemoteFoo object in my ZODB rather than a Foo object). Say one user edits one of the objects (e.g. changes the name/phone number etc. of one of the entries in the shared address book). and then I callRemote to some method like "updateObject" on the users Avatar and pass this object to this method. According to the doc page I mentioned previously "Copyable objects return unchanged from a round trip", but when I check if the object is in the list on the server it thinks it isn't there. In fact, they seem to point to different objects in memory, so naturally a "if object in list" statement will fail. Am I checking for equality in the wrong way? Or am I approaching the problem in the wrong way? I am quite new to Twisted, so I apologise if the problem is obvious. Robert

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[Twisted-Python] Creating a proxy between a flash client and xmlBlaster
by Richard Strong 28 Jun '06

28 Jun '06

Hi all, I am attempting to build a proxy between xmlBlaster and a Flash client using an XmlSocket on the client side. My cludge was going to be the twisted library. Essentially I want to have the update function of xmlBlaster call basic.LineReceiver.sendLine(...) and the lineReceived function of twisted to call self.msgPublish. I have a through line working from the Flash client to xmlBlaster, but cannot get a message from xmlBlaster to Flash (even after a Flash client has successfully logged in.). Any help would be divine. Here is a copy of the source code for the server that has been created: from const import * import sys import os import time import signal import threading sys.path.insert(0, CLIENTPATH) import bistBlast from twisted.protocols import basic from twisted.internet import reactor, protocol from twisted.internet.protocol import Protocol class Proxy(bistBlast.bistBlast,basic.LineReceiver, threading.Thread): delimiter = '\0' def __init__(self): print "init======================================================>" #bistBlast.bistBlast.__init__(self, 8009) def update(self, sessionId, key, content, qos): print """__recieved message__ """ print "__key__", key print "__content__\n", content.data print "__qos__", qos #print "" self.sendLine('<MESSAGE USER="John" TEXT="Hello, my name is John!" />') #self.message('<MESSAGE USER="John" TEXT="Hello, my name is John!" />') #self.sendLine(key) return "" def lineReceived(self,line): if line == "<policy-file-request/>": print "\t sending policy file" self.sendLine("<?xml version=\"1.0\"?><cross-domain-policy><allow-access-from domain=\"*\" to-ports=\"8007\" /></cross-domain-policy>") #bistBlast.bistBlast.__init__(self, 8009) #self.msgSubscribe("test") else: print "LINE RECEIVED" try: bistBlast.bistBlast.__init__(self, 8009) self.msgSubscribe("test") except: print "already connected" self.msgPublish("<key oid='test' />", "<what />") self.sendLine('<MESSAGE USER="John" TEXT="Hello, my name is John!" />') def sendLine(self, msg): print "Sending Message" basic.LineReceiver.sendLine(self, msg) print "Sent Message" def message(self, msg): self.transport.write(msg + '\n' + delimiter) print msg + '\n' # Main if __name__ == '__main__': ProxyFactory = protocol.ServerFactory() ProxyFactory.protocol = Proxy reactor.listenTCP(8007, ProxyFactory) reactor.run()

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[Twisted-Python] Naive questions about how to do it twisted way.
by Jia Liu 28 Jun '06

28 Jun '06

Hi, I have been follow twisted for like half a year now, I have read the doc and the oreilly book, but i still cann't do some simple work in the twisted way. Could someone give me a hint? Like today, i write this little code to follow my friends list on my msn space, and get their friends list, so on and so on, and maybe at last I can build a social relationship graph with it. The code is actually really navie, here it goes. Sorry for the ugliness of my code, please help me make it prettier:) Thanks. Appologize for my poor English. Jia Liu import re, sys, socket import urllib from sets import Set socket.setdefaulttimeout = 10 re_buddy_pre = re.compile("href=\"(?:http://)?([^\.\"]+)\.spaces.msn.com", re.IGNORECASE) # http://nick.spaces.msn.com re_buddy_post = re.compile("spaces.msn.com/members/([^\"\/]+)", re.IGNORECASE) # http://spaces.msn.com/members/nick/ all_buddies = Set() relation_dict = {} def get_buddy(page, buddy=None): #print page print buddy global all_buddies buddies_of_this_page = Set() for re_buddy in [re_buddy_pre, re_buddy_post]: for m in re_buddy.finditer(page): buddies_of_this_page.add(m.group(1)) relation_dict[buddy] = buddies_of_this_page return buddies_of_this_page def got(url, buddy=None): f = urllib.urlopen(url) return f.read(), buddy URL = "http://ayueer.spaces.msn.com/" (page, buddy) = got(URL, "ayueer") buddies_of_this_page = get_buddy(page, buddy) all_buddies.add("ayueer") next_to_visit = buddies_of_this_page.difference(all_buddies) try: while 1: #reactor.run() #multi_buddy_factory(buddies_of_this_page) for buddy in next_to_visit: url = "http://"+buddy+".spaces.msn.com/" try: (page, buddy) = got(url, buddy) buddies_of_this_page.update(get_buddy(page, buddy)) except: pass all_buddies.update(next_to_visit) next_to_visit = buddies_of_this_page.difference(all_buddies) except KeyboardInterrupt: print all_buddies -- 银筝夜久殷勤弄，心怯空房不忍归

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[Twisted-Python] Mobile code using PB
by Tzahi Fadida 28 Jun '06

28 Jun '06

Hi, I am looking for a way to have a mobile code feature using PB very similar to pyro. The idea is like this: There is a server and a client. The client trust the server completly. The server does not trust the client. The client gets arbitrary classes from the server and if a module of the class is missing it raises an exception that will ultimately result in downloading the module and injecting it. If the module exists locally (same ver or something like that) do not download it. Basically i can override the security options like so: pb.globalSecurity.isModuleAllowed=\ jelly.DummySecurityOptions().isModuleAllowed pb.globalSecurity.isClassAllowed=\ jelly.DummySecurityOptions().isClassAllowed pb.globalSecurity.isTypeAllowed=\ jelly.DummySecurityOptions().isTypeAllowed If i call a remote method and the returned value is an unknown class, i recieve importError as "failure" which i can handle and send the module to the client However, if i send an unknown class as a parameter for a remote method, the exception at the remote side is handled behind the scene and i can't seem to trap it. Though, i am getting the importError failure message on the calling side (so it is somehow manageable). Is there something that already exists so i won't have to reinvent the wheel? using this trust model, do i really need pb.copyable and pb.remotecopy? I.e. i want to replace these with custom isModuleAllowed isClassAllowed, etc... 10x. -- Regards, Tzahi. -- Tzahi Fadida Blog: http://tzahi.blogsite.org | Home Site: http://tzahi.webhop.info WARNING TO SPAMMERS: see at http://members.lycos.co.uk/my2nis/spamwarning.html

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[Twisted-Python] Starting POP3 server as an application in a .tac file
by jarrod roberson 28 Jun '06

28 Jun '06

anyone have a basic example of how this would look?

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[Twisted-Python] reset/restart reactor problem
by Joseph Newman 27 Jun '06

27 Jun '06

Hi All, I am porting an academic middleware project, currently implemented in C++ and Java, to python. It extensively uses multicast for communicating general events and TCP to communicate with a database. The multicast messages that I send out depend on the results that I first obtain from the database. I would prefer to serialise each of these requests in turn, but its not immediately obvious to me what the best way to do this using Twisted is. If I could reset the reactor after each client/server transaction that would be by far the easiest. I have been experimenting with threadedselectreactor, but I currently don't have an event loop as such that is independent of the reactor event loop. Nearly all the examples deal with processes that either act as servers or clients, rather than combinations of the two. Thanks in advance for any help, Joe Newman

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[Twisted-Python] Performance data?
by Chaz. 27 Jun '06

27 Jun '06

I was wondering if anyone had performance data on using twisted with XML-RPC, PB and/or SOAP (using ZSI)? Peace, Chaz

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[Twisted-Python] Bay Area Twisted sprint.
by David Reid 26 Jun '06

26 Jun '06

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hello there, I'm attempting to think about possibly organizing a Twisted sprint (focus on closing bugs) in the San Francisco/Bay Area for mid to late July. I know there are quite a few Twisted committers who are in the area and I've approached some of them to gather preliminary information regarding availability and interest. There are also some people in town for the summer for various reasons who've expressed interest. So this is an open invitation to every on twisted-python and twisted-web who is in the bay area (or willing to travel to the bay area) for a weekend sprint. I need a rough approximation of how many people will actually be able to make it so that I can attempt to locate a place to hold the sprint. So if you're interested email me with your availability for the weekends of the 15-16, 22-23, 29-30. Basically I'll take the weekend with the most available participants and start fishing around for a location. Alternatively if you would like to host the sprint at your large private estate or successful corporate offices you can contact me as well with your preference for any of the above dates and some details about the facilities you can provide. (Close proximity to a caffeine dispensary and reliable unrestrictive internet access are a must. Comfy chairs a plus.) - -David Reid - -- "Usually the protocol is this: I appoint someone for a task, which they are not qualified to do. Then, they have to fight a bear if they don't want to do it." -- Glyph Lefkowitz -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (Darwin) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFEoGzIrsrO6aeULcgRAlGmAKCfO9zBU/2UV5mIMXfNHRo7jlyXrACfSDbB +TQMSPD7uwLnSDV1Ou2H/Qc= =cWIj -----END PGP SIGNATURE-----

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