Mailman 3 March 2008 - Twisted

[Twisted-Python] Trying to get twisted.protocols.amp to work with py2app...
by Nathan March 7, 2008

March 7, 2008

I'm on a MacBook Pro running OS X 10.5.2 using py2app installed with the "easy" method in the py2app install docs. I'm trying to package a little pyglet+twisted (pyglet.org, twistedmatrix.com) project that I'm working on, and it _mostly_ works, except it keeps giving me the following error when I try to run the resulting app: ImportError: No module named amp Help!? I've done the following steps to try to debug the problem, with no success: * Noticed that the following imports DO work: … [View More]

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[Twisted-Python] Twisted at PyCon 2008
by Duncan McGreggor March 7, 2008

March 7, 2008

Hey everyone, A conference group has been set up at crowdvine: http://pycon2008.crowdvine.com/ I just signed up and started some twisted tagging -- I encourage everyone to do the same and give the project a nice presence on the conference social site :-) d

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[Twisted-Python] AMP + SSH?
by Nathan March 6, 2008

March 6, 2008

Is there a "twisted" way to run AMP over an SSH connection (with conch?) The manual way of doing what I want is to connect two machines with a TCP port tunneled over ssh, and have my AMP client/server talk over the manually tunneled port. ~ Nathan

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Re: [Twisted-Python] Re: Trying to get twisted.protocols.amp to work with py2app...
by Stephen Waterbury March 6, 2008

March 6, 2008

Steve Holden wrote: > Andreas Kostyrka wrote: >> Am Mittwoch, den 05.03.2008, 15:01 -0500 schrieb Phil Christensen: >> >> Well, how buggy it is, is open to discussion. Clearly distutils becames >> quite nicer when upgraded to setuptools. But having no packaging format >> is not a solution either. I have no idea how long you've been doing >> Python but I do remember the times when most C language modules came >> without any build support (figure out … [View More]

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Re: [Twisted-Python] thread created from tcp connection
by big_tyo＠inf.its-sby.edu March 6, 2008

March 6, 2008

> Date: Thu, 28 Feb 2008 06:11:58 -0000 > From: glyph(a)divmod.com > Subject: Re: [Twisted-Python] thread created from tcp connection > On 05:59 am, big_tyo(a)inf.its-sby.edu wrote: >>The Problem is i still haven't figure out how to send some parameters >>to a >>thread that created from established tcp connection. > > The real problem is probably that Twisted is not thread safe; you > probably should not be using threads at all. >>ps : sorry for the … [View More]

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Re: [Twisted-Python] Teach Me Twisted
by Samuel Reynolds March 5, 2008

March 5, 2008

At 01:37 PM 3/5/2008, you wrote: >It would be cool to get an episode or two recorded at PyCon. Does >anyone who is going have a portable audio recording setup that they >can bring? If not, I recommend the Zoom H2. - Sam __________________________________________________________ Spinward Stars, LLC Samuel Reynolds Software Consulting and Development 303-805-1446 http://SpinwardStars.com/ cell 303-501-4414

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[Twisted-Python] Teach Me Twisted
by Steve Holden March 5, 2008

March 5, 2008

OK, with no reference to anyone else I have scheduled an Open Space session for 8pm to 10pm on the Saturday evening: http://wiki.python.org/moin/Open_Space I have written a few notes about my intentions in a separate Wiki page linked from the Open Space page: http://wiki.python.org/moin/PyCon2008/TeachMeTwisted Since we want to make sure we get a room of the right size I ask on that page for those intending to be there to sign up in advance. Please do so. Please also feel free to … [View More]

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[Twisted-Python] http server performance
by bharath venkatesh March 5, 2008

March 5, 2008

hi, my project involves lot of I/O over the network.. one part of my project involves a server(http) which is listening on the port for many client . this sever fetches an image from the web and and send it to clients .... and many clients will request the server concurrently .. to implement concurrent serving to clients i used threaded http server like this class HTTPServer(SocketServer.ThreadingMixIn,BaseHTTPServer.HTTPServer): pass class RequestHandler(BaseHTTPServer.… [View More]BaseHTTPRequestHandler): def do_GET(self): print "received connection from: ",self.client_address image=image_retreive() #where image retreive is a function that retrieves image from the web and works fine self.send_response(200) self.send_header("Content-type",format) self.send_header("Content-Length",len(image_data)) self.end_headers() self.request.sendall(image_data) httpd = HTTPServer(('',port_number), RequestHandler) httpd.serve_forever() this code worked fine but this performance was very bad ... it workes fine if the clients requested for small n medium size images as the server sends the response immediately and also workes fine if one client is requesting a large image (obviously server takes time to send response as it takes time to fetch the image from the web ) and other clients concurrently request for small and medium images these clients will be served immediately even if the other client is waiting but problem crops up when 2 clients concurrently request for an large image .. while these two clients are waiting for the response fromthe server . The server doesn't accept any other client request ... i can see this as i am printing the address of the client that connects with server in the 1st line of get method of the request handler if two clients concurrently request for an large image and only two clients address gets printed that means only 2 clients receives connection to the server even if other clients are requesting the server at the same time and other servers are served only after the those 2 server releases the connection or get the response . that means server servers only 2 clients at a time .this is very undesirable as even if 3rd client is requesting for very small image and 2 clients are waiting for large image .. 3rd client won't receive the response until those 2 clients are served . to make thing worst my server should serve 10 to 15 clients concurrently to solve this i did some searching and found about cherrypy and twisted also implemented my server in cherrypy like this from cherrypy import wsgiserver def image_httpserver_app(environ, start_response): print >>sys.stdout,"received connection from: (%s : %s ) \nthe image url is: %s " % (environ["REMOTE_ADDR"],environ["REMOTE_PORT"],environ["QUERY_STRING"]) status = '200 OK' response_headers = [('Content-type',format)] image=image_retreive() response_headers = [("Content-Length",`len(image_data)`)] start_response(status, response_headers) return [image_data] mappings=[('/', image_httpserver_app)] wsgi_apps = mappings server = wsgiserver.CherryPyWSGIServer(('localhost', 8888), wsgi_apps, server_name='localhost',numthreads=20) if __name__ == '__main__': try: server.start() except KeyboardInterrupt: server.stop() this didn't solve the problem at all .. same thing is happening only 2 clients is served at a time ..even if no of threads is assigned to 20 .. i have did lot of searching and reading .. and hoping to find a solution ..can anyone make it easier for me i have heard of twisted deffered object .. will it solved the problem ? if not pls suggest me alternative.. [View Less]

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[Twisted-Python] writing back through open connections
by David Welch March 4, 2008

March 4, 2008

Hi, I'm new to twisted and I am having trouble writing back through open tcp connections. In my setup I have many clients (lets say 10 for this example) connecting to a server running twisted. Each time a new client connects I maintain that connection indefinitely and it populates a list of available clients the server can talk to. I want a user to select from that list and send data to that client using the open connection. In this case a client won't cause an event (so I can't … [View More]

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[Twisted-Python] twisted plugins
by Gabriel Rossetti March 4, 2008

March 4, 2008

Hello, I tried creating some test plugins using the plugin howto on the twisted website. I did as shown, I added the plugins dir to the PYTHONPATH and tested it. The problem is I get nothing back when calling getPlugins(IMyInterface). Here is some code : ---------------------------------------------------------------------------------------------- from zope.interface import Interface class IHelloWorld(Interface): """ A simple test plugin that displays "Hello … [View More]world" """ def display(): """ Displays on stdout "Hello world" in a language chosen by the programmer """ ---------------------------------------------------------------------------------------------- from twisted.plugin import IPlugin from zope.interface import implements from interfaces import ihelloworld class EnglishHelloWorld(object): implements(IPlugin, ihelloworld.IHelloWorld) def display(self): """ Displays on stdout "Hello world" in English """ print "Hello world!" ---------------------------------------------------------------------------------------------- from twisted.plugin import getPlugins from twisted.plugin import IPlugin from interfaces import ihelloworld def displayHelloWorld(): for h in getPlugins(ihelloworld.IHelloWorld): h().display() if(__name__ == "__main__"): displayHelloWorld() ---------------------------------------------------------------------------------------------- I tried running in debug mode to see what happens, but I don't get it, in the getPlugins() code, it does this : allDropins = getCache(package) and in this dict I see my plugins, but their inner "plugin" member is an empty list. I looked at the code of some of the examples, they used "classProvides()" and not "implements()", so I tried that : ---------------------------------------------------------------------------------------------- from twisted.plugin import IPlugin from zope.interface import implements from zope.interface import classProvides from interfaces import ihelloworld class EnglishHelloWorld(object): classProvides(IPlugin, ihelloworld.IHelloWorld) def display(self): """ Displays on stdout "Hello world" in English """ print "Hello world!" ---------------------------------------------------------------------------------------------- which works, is the doc out of sync with the current code or did I do something wrong? Another question, it's not really very practical to have to iterate all the plugins and I guess test to see which one is which, is there a better way of doing it? Thank you, Gabriel [View Less]

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