Mailman 3 July 2010 - Twisted

[Twisted-Python] Twisted Python 0.7.0 Prerelease Testing
by Glyph Lefkowitz 05 Aug '21

05 Aug '21

hi there, folks: I'd really like to release 0.7.0 but I would like it to be at least a little bit tested before I do so. Could those of you with CVS trees check everything out and see if it performs as advertised? Deeper bugs than that will have to wait for the next release, but I'd at least like to know if it works for someone other than me. Thanks. ______ __ __ _____ _ _ | ____ | \_/ |_____] |_____| |_____| |_____ | | | | @ t w i s t e d m a t r i x . c o m http://www.twistedmatrix.com/~glyph/

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by Tamika 01 May '19

01 May '19

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[Twisted-Python] regarding xml elements
by Raj kumar 02 Oct '13

02 Oct '13

Hi, I have an xml file in my application, I have created an element using Example goes like this......... document.createElement("abc") and i appeneded it by using append() method. But how i can reflect this change to my xml file? and one more thing is i want to create element with some other parameters.... like............. <abc m=" " n=" "> </abc> and i have m and n values as strings with me. can anybody help me to create this element and write it to the existing xml file as a child of an existing element? Thanks in advance.. Raj.. Forgot the famous last words? Access your message archive online at http://in.messenger.yahoo.com/webmessengerpromo.php

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[Twisted-Python] Get IP of connecting client in XMLRPC server
by Remy C. Cool 28 Apr '13

28 Apr '13

Hello, On 18 May 2004, the following message was posted to this mailinglist: Jp Calderone exarkun at divmod.com wrote: >Daniel Newton wrote: > > I have a simple XML-PRC server similar to the example below: > > from twisted.web import xmlrpc, server > > class Example(xmlrpc.XMLRPC): > """An example object to be published.""" > > def xmlrpc_add(self, a, b): > """Return sum of arguments.""" > return a + b def xmlrpc_whatIsMyAddress(self): return self.transport.getPeer().host > > if __name__ == '__main__': > from twisted.internet import reactor > r = Example() > reactor.listenTCP(7080, server.Site(r)) > reactor.run() > > I want to be able to get the address of the client that calls the xmlrpc > method can anyone help me with this? This solution didn't work because 'transport' isn't a property of the Example class. I'm currently in the process of changing from a customized SimpleXMLRPCServer to a twisted XMLRPC server solution and I need to insert the client IP into the attributes passed to the called xmlrpc method. Anyone who knows the answer and is willing to share the info? Regards, Remy

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[Twisted-Python] http.Request and JSON
by Vincent Gulinao 25 Jan '12

25 Jan '12

How do you read JSON content from a POST using http.Request. I peeked on args and it's empty. TIA.

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[Twisted-Python] OpenStack uses Twisted
by Alvin Wang 02 Aug '10

02 Aug '10

FYI - I went to a presentation on Nova/OpenStack https://launchpad.net/nova They use Twisted and they are planning on taking out Tornado. You can run your own amazon using Twisted.

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[Twisted-Python] Asynchronous gzipped content decompression: best approach
by Michele - 30 Jul '10

30 Jul '10

Hi Itamar, Thanks for the hint, it took me a while to make it work but it does do the job very well. For future reference to the thread readers, the bytes to skip are the first 10 of the first set of data received by the protocol. Thanks again Michele

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[Twisted-Python] LDAP binds appears to succeed with no password
by Peter Westlake 30 Jul '10

30 Jul '10

I'm using LDAP to authenticate users, and when I give it an empty password, it appears to succeed! Can anyone see what I'm doing wrong? I've added comments by the log messages that appear in the output. Peter. from twisted.internet import reactor, defer from ldaptor.protocols.ldap import ldapclient, ldapsyntax, ldapconnector, ldaperrors from ldaptor.protocols import pureldap as L import log class LDAPAuthenticationSource(object): def __init__(self, base_dn, hostname=None, attr='uid', bind_dn='', bind_pw='', filter=L.LDAPFilter_present('cn')): self.hostname = hostname self.base_dn = base_dn self.attr = attr self.bind_dn = bind_dn self.bind_pw = bind_pw self.filter = filter self.cli = None @defer.inlineCallbacks def authenticate(self, username, password): if not password: log.info('Empty password!!!!') ####### appears else: log.debug('Attempting to login as', username) c = ldapconnector.LDAPClientCreator(reactor, ldapclient.LDAPClient) self.client = yield c.connect(self.base_dn) yield ldapsyntax.LDAPEntry(self.client, self.bind_dn).bind(self.bind_pw) entries = [] base = ldapsyntax.LDAPEntry(self.client, self.base_dn) yield base.search( filterObject=L.LDAPFilter_and( [L.LDAPFilter_equalityMatch( attributeDesc=L.LDAPAttributeDescription(self.attr), assertionValue=L.LDAPAssertionValue(username) ), self.filter, ]), attributes = (self.attr,), # No need to read the whole entry! callback=entries.append ) n_entries = len(entries) if n_entries == 0: self.client.unbind() log.debug('Failed login for %s: no search results' % (username,)) raise Exception('No search results!') elif n_entries > 1: self.client.unbind() log.debug('Failed login as %s: %d search results for unique entry!' % (username, n_entries)) raise Exception('%d search results for unique entry!' % n_entries) else: # The password matches if we can bind as this DN with it. try: if not password: log.info('Empty password') ##### appears user_entry = yield entries[0].bind(password) if not password: log.info('Succeeded with an empty password!') ##### appears log.info('user_entry:') ##### appears log.info(user_entry) ##### appears log.info('Login:', username) except ldaperrors.LDAPInvalidCredentials: log.info('Failed login for %s: invalid credentials' % username) raise except Exception, e: log.rep(e, 'Error while binding with user password') self.client.unbind() raise self.client.unbind() defer.returnValue(user_entry)

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[Twisted-Python] Asynchronous gzipped content decompression: best approach
by Michele - 30 Jul '10

30 Jul '10

Hi, I have written a small utility function to replace "twisted.web.client.getPage", to be able to read the response header. I have to say that the ever improving documentation made it quite easy for me to do it using the new twisted.web.client.Agent, so well done to all! Since my wrapper works quite well, I decided to add gzip response support, as it's another feature lacking from the original getPage. Again, it was quite simple and it looks it works quite well, in proof of concept scenario. Then it came my dilemma. What I'm doing now is a synchronous decompression as shown below: compressedstream = StringIO.StringIO(inzip) gzipper = gzip.GzipFile(fileobj=compressedstream) _data = gzipper.read() return _data This works quite well, but I wanted to add support for arbitrary large compressed responses, and I wanted to ask your opinion on the best approach for this: -a separate thread? it has it's limit, as it's not scaling well at all, but, in the possible scenario of a getPage usege shouldn't be a big issue (i.e. not many concurrent calls) -a Producer/consumer? That sounded like the modern twisted way of doing it, but I didn't manage to be able to implement it properly, as I could create a proper "consumer" class by looking to the example in the documentation... -twisted.python.zipstream.DeflatedZipFileEntry? I found this and seemed a potential way of doing it, with may be the use of inline generators? But then, I thought, is it a too complex approach for a simple problem? I guess that decompressing data in twisted should be a fairly common task, but I have not found a sample that looked like the "best" way for doing it, so... here is this email Thanks for you help, and I'll be happy to post the final code for future reference if anyone is interested Michele

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[Twisted-Python] Is that behavior of t.i.stdio.StandardIO known?
by Alexey 29 Jul '10

29 Jul '10

The code is in attachment. I run it on Debian/Linux, twisted 10.0.0 When you run it on a terminal, it works by prefixing the data you enter with "dataReceived: " and outputting that back to terminal. $ ./program.py i: blabla o: dataReceived: 'blabla o: ' i: ^D o: readConnectionLost(input is done) i: ^C o: OK $ The same happens if you redirect output to a pipe (no matter if it a named FIFO or an anonymous pipe). But if you redirect output to a file or to a /dev/null, this happens: $ ./program.py > /dev/null <a short pause, no input> o: StdioProtocol.connectionLost('[Failure instance: Traceback (failure with no frames): <class 'twisted.internet.error.ConnectionLost'>: Connection to the other side was lost in a non-clean fashion. o: ]')OK $ But I expected it to work the same way, regardless of redirections. I haven't traced the source of that Failure, so just asking, whether that behavior is known, or maybe intended? Or, perhaps, I do something incorrectly? Well, right now I'm using the workaround with /bin/cat: $ ./program.py > >(cat > file) or with an extra shell process: $ ./program.py | cat > file

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