Twisted June 2014

twisted@python.org

31 participants
28 discussions

[Twisted-Python] Twisted Python 0.7.0 Prerelease Testing

by Glyph Lefkowitz

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/

5 months, 2 weeks

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by Tamika

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2 years, 8 months

[Twisted-Python] Better usage of Twisted on multi core processor

by Sumanth Puram

Hi all, I have a twisted TCP server to listens to client, processes requests, do mysql database operations if needed (using adbapi Connection pool) and return the result. Before deploying this in production, I want to know right way to configure the server. Since twisted is single threaded, how can I leverage multiple cores of my production machine (which has 6 cores and 16 GB RAM) ? One approach that I thought of was to start multiple instances of twisted server on different ports. This would help in using the other cores as well. What do you guys suggest ? Thanks -Sumanth

6 years, 10 months

[Twisted-Python] [ANN] txZMQ released

by Andrey Smirnov

Hi! I would like to announce txZMQ, ZeroMQ bindings for Twisted. txZMQ is based on pyzmq and requires recent ØMQ version (>=2.1). txZMQ uses ØMQ APIs to get file descriptor that is used to signal pending actions from ØMQ library IO thread running in separate thread. txZMQ should be usable with any Twisted reactor. ØMQ is: * The socket library that acts as a concurrency framework. * Carries messages across inproc, IPC, TCP, and multicast. * Connect N-to-N via fanout, pubsub, pipeline, request-reply. * Fast enough for clustered products and supercomputing. * Asynch I/O for scalable multicore message-passing apps. Bridging ØMQ and Twisted makes a nice match: fast simple messaging between Twisted instances solving complex problems :) Links: * PyPi: http://pypi.python.org/pypi/txZMQ/ * Source code: https://github.com/smira/pyzmq * pyzmq: http://pypi.python.org/pypi/pyzmq * ØMQ: http://www.zeromq.org/ -- Andrey Smirnov, Qik Web Team Lead

7 years, 6 months

[Twisted-Python] bringing LDAP back

by Glyph

Hello fellow Twistrons, A long time ago, for reasons we need not discuss here, the pure-python LDAP implementation within Twisted was pulled out into a separate package under a different license. Recently however, the authors of this LDAP code have generously re-licensed the code under a Twisted-compatible MIT license, both the original code at <https://github.com/tv42/ldaptor/commit/7e249b1586789a5c588f662ce74ee9f43386…> and the more recent fork (which I believe has more users) at <https://github.com/antong/ldaptor/issues/10>. It seems as though there's even a solution for the problematic MD4 implementation here <https://github.com/tv42/ldaptor/pull/2>. Since there's no active, central hub for ldaptor development, I think we should pull it into the Twisted org on Github, and some of the folks on the Cc: line have volunteered to help with that. Does that sound good to everybody? (Are you excited!!!?) It's also a possibility that we could distribute a for-real SSO back-end with Cred using this, which I'm pretty excited about. -glyph

7 years, 6 months

[Twisted-Python] Ticket comment permissions on Trac

by Adi Roiban

Hi, I would like to receive ticket comment permissions on Trac. My trac username is: adiroiban Thanks! -- Adi Roiban

7 years, 6 months

[Twisted-Python] OSX 10.9 Trial ZipPath issue

by Jason J. W. Williams

Since upgrading to OSX 10.9 I seem to have this issue when running trial (tried it with Twisted 13.0.0, 13.2.0 and 14.0.0): Unexpected error while writing cache file Traceback (most recent call last): File "/usr/local/lib/python2.7/site-packages/twisted/scripts/trial.py", line 472, in postOptions _BasicOptions.postOptions(self) File "/usr/local/lib/python2.7/site-packages/twisted/scripts/trial.py", line 382, in postOptions self['reporter'] = self._loadReporterByName(self['reporter']) File "/usr/local/lib/python2.7/site-packages/twisted/scripts/trial.py", line 369, in _loadReporterByName for p in plugin.getPlugins(itrial.IReporter): File "/usr/local/lib/python2.7/site-packages/twisted/plugin.py", line 209, in getPlugins allDropins = getCache(package) --- <exception caught here> --- File "/usr/local/lib/python2.7/site-packages/twisted/plugin.py", line 181, in getCache dropinPath.setContent(pickle.dumps(dropinDotCache)) The only zip on the path is the pseudo python27.zip. Any ideas? -J

7 years, 6 months

[Twisted-Python] [RELEASE] Nevow 0.11.1

by exarkun＠twistedmatrix.com

Hello, I'm pleased to announce the release of Nevow 0.11.1. Nevow is a web application construction kit written in Python and based on Twisted. It is designed to allow the programmer to express as much of the view logic as desired in Python, and includes a pure Python XML expression syntax named stan to facilitate this. However it also provides rich support for designer-edited templates, using a very small XML attribute language to provide bi-directional template manipulation capability. This release includes a number of minor new features and bug fixes. It also includes changes to modernize Nevow's packaging - installation of Nevow using `pip` is now supported. This release also marks the move of Nevow development to Github. You can read about all of the changes in this release in the NEWS file: https://github.com/twisted/nevow/blob/release-0.11.1/NEWS.txt You can find Nevow on PyPI: https://pypi.python.org/pypi/Nevow Or on Github: https://github.com/twisted/nevow Enjoy! Jean-Paul http://as.ynchrono.us/

7 years, 6 months

[Twisted-Python] send-msearch on all network interfaces of a machine

by Pratik Prajapati

Hi, I am implementing a code through which i have to get devices connected to all network interfaces on my machine and list them . For this, i am first getting the ip of all network interfaces and then sending m-search command on them. After 2.5 seconds port is stopped to listen. But it is giving me some assertion error. (I am connected to 2 interfaces -ethernet and wifi) `Code:` class Base(DatagramProtocol): """ Class to send M-SEARCH message to devices in network and receive datagram packets from them """ SSDP_ADDR = "239.255.255.250" SSDP_PORT = 1900 MS = "M-SEARCH * HTTP/1.1\r\nHOST: {}:{}\r\nMAN: 'ssdp:discover'\r\nMX: 2\r\nST: ssdp:all\r\n\r\n".format(SSDP_ADDR, SSDP_PORT) def sendMsearch(self): """ Sending M-SEARCH message """ ports = [] for address in self.addresses: ports.append(reactor.listenUDP(0, self, interface=address)) for port in ports: for num in range(4): port.write(Base.MS, (Base.SSDP_ADDR,Base.SSDP_PORT)) reactor.callLater(2.5, self.stopMsearch, port) # MX + a wait margin def stopMsearch(self, port): """ Stop listening on port """ port.stopListening() `Error:` Traceback (most recent call last): File "work\find_devices.py", line 56, in sendMsearch ports.append(reactor.listenUDP(0, self, interface=address)) File "C:\Python27\lib\site-packages\twisted\internet\posixbase.py", line 374, in listenUDP p.startListening() File "C:\Python27\lib\site-packages\twisted\internet\udp.py", line 172, in startListening self._connectToProtocol() File "C:\Python27\lib\site-packages\twisted\internet\udp.py", line 210, in _connectToProtocol self.protocol.makeConnection(self) File "C:\Python27\lib\site-packages\twisted\internet\protocol.py", line 709, in makeConnection assert self.transport == None AssertionError This code worked: def sendMsearch(self): """ Sending M-SEARCH message """ address = socket.gethostbyname(socket.gethostbyname()) port = reactor.listenUDP(0, self, interface=address) for num in range(4): port.write(Base.MS, (Base.SSDP_ADDR,Base.SSDP_PORT)) reactor.callLater(2.5, self.stopMsearch, port) # MX + a wait margin Please tell what's wrong in code mentioned in the start of this mail and how to correct this. I have also posted this code on stackoverflow , but didn't get any response http://stackoverflow.com/questions/24178580/send-m-search-packets-on-all-ne…

7 years, 6 months

[Twisted-Python] Effects of calling transport.writeSomeData() ?

by Mark Montague

We're writing a Twisted 14.0.0 application (on Python 2.7.7, Mac OS 10.9.3) that uses Conch as an SSH client; this is working fine. However, we have the requirement that in an advanced mode of operation for power users that the application take advantage of OpenSSH connection multiplexing over an already-established-by-the-user OpenSSH ControlMaster session (via an OpenSSH ControlPath socket) instead of using Conch. OpenSSH requires its new session command and forwarded file descriptors to be sent over the socket in a very particular way: the command must be sent first, followed by message with a '\0' byte with each forwarded file descriptor. OpenSSH ignores the '\0' for each file descriptor, extracting the file descriptors themselves from the message's ancillary data. The following will not work because none of the calls to write() send their data until control is returned to the reactor, while sendFileDescriptor() queues up the descriptors such that they get sent them with the very next data that is sent -- which wind up being the first three bytes of the command rather than the three '\0' bytes. class OpenSSHMuxProtocol( protocol.Protocol ): # built via reactor.connectUNIX() def sendCommand( self, command ): # Does not work: self.transport.write( command ) self.transport.sendFileDescriptor( sys.stdin.fileno() ) self.transport.write( '\0' ) # payload for the stdin file descriptor self.transport.sendFileDescriptor( sys.stdout.fileno() ) self.transport.write( '\0' ) # payload for the stdout file descriptor self.transport.sendFileDescriptor( sys.stdout.fileno() ) self.transport.write( '\0' ) # payload for the stderr file descriptor # ^^^ Does not work But this next solution /does/ work: from socket import SOL_SOCKET from twisted.python.sendmsg import SCM_RIGHTS, send1msg class OpenSSHMuxProtocol( protocol.Protocol ): # built via reactor.connectUNIX() def sendCommand( self, command ): self.transport.writeSomeData( command ) # data is sent over the socket immediately send1msg( self.transport.socket.fileno(), "\0", 0, [ ( SOL_SOCKET, SCM_RIGHTS, pack( 'i', sys.stdin.fileno() ) ) ] ) send1msg( self.transport.socket.fileno(), "\0", 0, [ ( SOL_SOCKET, SCM_RIGHTS, pack( 'i', sys.stdout.fileno() ) ) ] ) send1msg( self.transport.socket.fileno(), "\0", 0, [ ( SOL_SOCKET, SCM_RIGHTS, pack( 'i', sys.stderr.fileno() ) ) ] ) My questions are: Is it bad to bypass the reactor and send data directly/immediately this way using writeSomeData() and send1msg()? Note that sendCommand() actually gets called in response to a OpenSSHMuxProtocol.dataReceived() event. If bypassing the reactor this way is bad, how bad is it and what are the consequences or effects? Is there a better way to get a working solution? I think I'd need some way to guarantee that the write of the command was actually sent to the OpenSSH server before the file descriptors are forwarded -- for example, if a Deferred was used whose first callback wrote the command and whose second callback forwarded the descriptors, would a call to the reactor to actually sent the command be guaranteed between the two callbacks? Any information and/or advice is appreciated! -- Mark Montague mark(a)catseye.org

7 years, 6 months

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Twisted June 2014