Mailman 3 December 2002 - Twisted

[Twisted-Python] PcapIO
by Neil Blakey-Milner Dec. 21, 2002

Dec. 21, 2002

Hi again, I'm currently using this PcapIO class in a traffic analyser, and thought people might find it useful, possibly for inclusion in twisted. It relies on pylibpcap (http://pylibpcap.sourceforge.net/). If interested, it's easy enough to use the example code in the pylibpcap distribution in your protocol's dataReceived. Neil -- Neil Blakey-Milner nbm(a)mithrandr.moria.org

1 0

[Twisted-Python] SCGIChannel: SCGI protocol support
by Neil Blakey-Milner Dec. 20, 2002

Dec. 20, 2002

Hi all, SCGI (http://www.mems-exchange.org/software/scgi/) is a replacement for the CGI protocol, in a similar manner to FCGI. Through mod_scgi on apache, you can delegate sections of a web site served by apache to be handled via SCGI: <Location "/jobsearch"> SCGIServer 127.0.0.1 4000 SCGIHandler On </Location> SCGIChannel serves as a replacement to HTTPChannel, performing the request with the information given over SCGI, and … [View More]

1 0

[Twisted-Python] New SerialPort transport and associated goodies
by Bob Ippolito Dec. 20, 2002

Dec. 20, 2002

For those of you that haven't noticed, I've added a SerialPort transport with some help from Itamar. It's dependent on pyserial (http://pyserial.sf.net/), and currently supports posix and Jython. It'll eventually support win32. I've done two GPS protocols, NMEA 0183 (almost all receivers support this) and Rockwell Zodiac (for the DeLorme Earthmate, which doesn't). There's other protocols for Trimble and Garmin receivers, but they support NMEA. There is a new gpsfix example in doc/… [View More]

1 0

[Twisted-Python] New SerialPort transport and associated goodies
by Bob Ippolito Dec. 20, 2002

Dec. 20, 2002

For those of you that haven't noticed, I've added a SerialPort transport with some help from Itamar. It's dependent on pyserial (http://pyserial.sf.net/), and currently supports posix and Jython. It'll eventually support win32. I've done two GPS protocols, NMEA 0183 (almost all receivers support this) and Rockwell Zodiac (for the DeLorme Earthmate, which doesn't). There's other protocols for Trimble and Garmin receivers, but they support NMEA. There is a new gpsfix example in doc/… [View More]

1 0

[Twisted-Python] woven nested lists
by Glyph Lefkowitz Dec. 18, 2002

Dec. 18, 2002

This is on its way to becoming a FAQ, so when LordVan asked how to do list nesting in woven on the IRC channel, I figured I should post something here rather than just answer the question there. http://www.twistedmatrix.com/users/glyph/py/src/nestedlist.py As it happens, I discovered a woven bug in the process :-). The code here has 2 embedded templates ('template' and 'brokenTemplate'), one of which works with CVS as of a few days ago and one of which works with CVS as of a few minutes ago. … [View More]

2 1

[Twisted-Python] Creating a new selectable (for Pg async interface)
by Gerhard Häring Dec. 18, 2002

Dec. 18, 2002

Hello, I'd like to learn asynchronuous programming with Twisted, because I think this will make me a better programmer, no matter if I'll use this paradigma in the end or not. So I thought about wrapping PostgreSQL's asynchronous interface to be usable from a Twisted app. I did once chat a little with Itamar about this on #twisted, and now I finally got around starting this. I don't really know much about twisted, so please correct me if this is wrong: A reactor is the Twisted main loop,… [View More] which selects on selectables, and invokes doRead() on them when data is available. Itamar told me I'd need to implement twisted.internet.abstract.FileDescriptor, so this is what I did (very incomplete code): #v+ from twisted.internet import abstract from pyPgSQL import libpq class PgAsyncConn(abstract.FileDescriptor): def __init__(self): abstract.FileDescriptor.__init__(self) # PostgreSQL stuff self.conn = libpq.PQconnectdb("host=gargamel dbname=gerhard") self.fileno = self.conn.socket.fileno self.startReading() def write(self, data): print "writing" def query(self, callback, errback, *args, **kwargs): print "sending query ..." self.conn.sendQuery(*args) self.callback, self.errback = callback, errback print "query sent." def operation(self, callback, errback, *args, **kwargs): print "operation" def doRead(self): self.conn.consumeInput() if not self.conn.isBusy: print "data available" res = self.conn.getResult() print "got result." bla = self.conn.getResult() assert bla is None print "query sucessfully processed." # call callback here self.callback(res) def connectionLost(self, reason): """The connection was lost. """ self.conn.finish() #v- Now I'm at the point where I'd like to try this code out. *But* obviously something is still missing. I believe my PgAsyncConn would need to be registered with the reactor?! Is this true and if yes, how do I do it? Btw. I'll try to keep my new baby interface-compatible with twisted.enterprise.adbapi as much as possible. Next question: I'd like to try my code out. Is there a good way to test this under Twisted, apart from writing a little server like the Echo example of the docs, and trying to call PgAsyncConn from it? TIA, Gerhard -- Favourite database: http://www.postgresql.org/ Favourite programming language: http://www.python.org/ Combine the two: http://pypgsql.sf.net/ [View Less]

6 7

[Twisted-Python] test_nmea failing
by Jp Calderone Dec. 18, 2002

Dec. 18, 2002

exarkun:~/projects/python/Twisted$ python2.1 admin/runtests -v -t --file twisted/test/test_nmea.py reactor class: twisted.internet.default.SelectReactor testGPSMessages (twisted.test.test_nmea.NMEAReceiverTestCase) ... FAIL ====================================================================== FAIL: testGPSMessages (twisted.test.test_nmea.NMEAReceiverTestCase) ---------------------------------------------------------------------- Traceback (most recent call last): File "./twisted/test/… [View More]

3 2

[Twisted-Python] Event-driven version of gzip module?
by l.m.orchard Dec. 17, 2002

Dec. 17, 2002

Still getting my head around Twisted, so hopefully I make sense in asking this: Does there happen to be an event-driven version of the gzip module for Twisted? That is, instead of expecting a file object to actively read and seek at will, it accepts chunks of data from a stream and hits a callback with decompressed chunks as they're available. (Would this involve a deferred?) I was trying to do something with just zlib, but I forgot that that doesn't do anything to handle the header … [View More]

2 1

Re: [Twisted-Python] woven headache
by Donovan Preston Dec. 16, 2002

Dec. 16, 2002

A List of Links into HTML The easiest way to do this is to use the List and Anchor widgets to handle the list and a string, respectively. If you had an RPY that looked like this (the main model is a list of strings): LinkList.rpy ---- from twisted.web.woven import page resource = page.Page(['http://www.google.com', 'http://www.foo.com'], templateFile="LinkList.html") ---- Your template file would look like this: LinkList.html ---- <html> <ul view="List" model="."> <!-- … [View More]

1 0

[Twisted-Python] woven headache
by Jaakko Niemi Dec. 15, 2002

Dec. 15, 2002

Hello, So, I tried to do a list of links from a list. Is the right way to do this to point href in self.attributes into a list? If it cannot handle a list, then I don't see how this could be done. --j

1 0