Mailman 3 August 2003 - Twisted

[Twisted-Python] Twisted Python 0.7.0 Prerelease Testing
by Glyph Lefkowitz Aug. 5, 2021

Aug. 5, 2021

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. ______ __ __ _____ _ _ | ____ | \_/ |_____] |_____| |… [View More]

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[Twisted-Python] Re: [Twisted-commits] log stderr and non-zero exit code in CGIs, don't show info to users as it is a security risk (closes issue #241)
by Glyph Lefkowitz Jan. 1, 2004

Jan. 1, 2004

On Thursday, August 28, 2003, at 10:32 AM, itamarst CVS wrote: > log stderr and non-zero exit code in CGIs, don't show info to users as > it is a security risk (closes issue #241) We shouldn't swallow errors in these situations. If it's a security risk, provide a way for the server administrator to turn it off, but this is a _bad_ default. If you doubt the wisdom of making this default, please consult any number of Perl FAQs of the form: Q. "I wrote a CGI and it works perfectly, … [View More]

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[Twisted-Python] error in pollreactor.py
by Eric C. Newton Aug. 31, 2003

Aug. 31, 2003

Method _dictRemove of pollreactor.py: def _dictRemove(self, selectable, mdict): try: # the easy way fd = reader.fileno() except: # the hard way: necessary because fileno() may disappear at any # moment, thanks to python's underlying sockets impl for fd, fdes in selectables.items(): if selectable is fdes: break else: # Hmm, maybe not the right course of … [View More]

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[Twisted-Python] Twisted sure is Twisted :)
by John Janecek Aug. 31, 2003

Aug. 31, 2003

Twisted once u get a grip on it sure is pretty impressive. I used twisted to forward UDP packets as a relay. Take one UDP packet and then retrans it to many other clients. On a FreeBSD box P3 750 the delay in retrans on packet to like 5 clients was less then 1ms which was very impressive. In using twisted i know the reactor is broken in wxpython. What would happen if u ran a normal reactor in a seperate thread, and then passed the info from twisted into wxpython using an event handler similar … [View More]to the wxpython thread demo ?? The only problem with that is i can not see how u would pass info from wxpython back into twisted. Hmmmm maybe if u made a queue, and then passed the commands onto a queue and then the reactor would pull them off. Something to ponder :). Solution on ActiveState cookbook will work, but i do not like timers. The idea behind deferred is intresting. The defered call back does not seem to fire until it is added. How the heck does that work ? I am refering to the database example. Hmmmm not really important but kinda neat. def getAge(user): return dbpool.runQuery("SELECT age FROM users WHERE name = ?", user) def printResult(l): if l: print l[0][0], "years old" else: print "No such user" d=getAge("joe") d.addCallback(printResult) like here d is the function getAge. My gut instict tell me the moment I call getAge the database query should be run. But yet it is not run till u add the callback. and if i add an errorback after it, it is not run till it has been added also, I can not see how it works :)). Hmmmm must be part of the magic :)) Starting to look into woven. Basic examples are impressive. It is a real object oriented web design. In the sandbox on CVS in the directory glyph there is an example on forms. I am unable to get it to work. It runs but eveytime I try and make it work I get in my browser the error no such child resource. I guess I have to keep pluggin away at it :). My limited experience shows i need to change my thinking, since twisted is not a "API" system like PHP, but more of a framework. Maybe it would help if i drank a bottle of vodka first :) I guess the only complaint i have about twisted is lack of woven examples, like for forms and guard. But heya it is opensource and free, so if i do not like it I can use some crappy comercial product :)). Anyways Twisted is really cool. A lot of it seems to be very magical :). Pondering whether I should get rid of my apache server and run a twisted one :)). Anyway this is the crap i ramble off at 4 am :) Just basically wanted to say twisted is cool. [View Less]

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[Twisted-Python] Plain text password with PB authentication?
by Boersma, Matt Aug. 30, 2003

Aug. 30, 2003

First, thanks to Itamar for nudging me in the right direction. I never thought of looking at the unit tests for documentation, but so far that's the clearest explanation of the new PBServerFactory stuff I've seen. Here's my problem. I have a PB client that calls login against the server, with a UsernamePassword object as credentials. PB sets up for me nice default implementations of the authentication mechanisms, but refuses to send the actual password to the server, only a doubly MD5-… [View More]

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[Twisted-Python] DeferredList failure accumulation
by Justin Johnson Aug. 29, 2003

Aug. 29, 2003

I've been doing a lot with DeferredList's lately and just want to make sure I'm doing things the "right" way. There a couple different situations where I want to report errors in Deferred's that are added to a DeferredList. 1) I define a remote_status method on the PB client that initiates the request. The PB server calls the remote_status method on the client to update the status for the particular task and redisplay the grid below, and if the status if a failure, passes the failure as an … [View More]

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[Twisted-Python] New PB API example?
by Boersma, Matt Aug. 29, 2003

Aug. 29, 2003

Howdy twisters, I'm writing a Perspective Broker client-server app. Things have been working fine, but as of recent Twisted builds (1.07 alpha 5?), my server code warns me that code like this: app = Application('myserver') app.listenTCP(8789, BrokerFactory(MyServer())) app.run() is deprecated. Specifically, that I should replace BrokerFactory with PBServerFactory. So I have plunged into catching up with this new API. And I'm heavily confused. All the existing HOWTOs and pbxxxx.… [View More]

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[Twisted-Python] Woven dynamic table, patterns and idioms wanted.
by Syver Enstad Aug. 29, 2003

Aug. 29, 2003

I am finally beginning to grasp woven, but I have a bit of code in my woven application that seems to reimplement views and would like some advice on how to avoid that. The scenerio is as follows: I have a table with a header and a rows where each row present an object. I use view="List" but I can't specify each attribute in the object as a column in the table with model and view because these are dynamic. In a static solution this would look something like this: <table model="myModel" … [View More]

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[Twisted-Python] timeout using LivePage
by Sean Gillies Aug. 27, 2003

Aug. 27, 2003

Hi, Am very new to Twisted but am quickly finding that I like it. All my questions and comments involve Twisted 1.0.6 in combo with Python 2.3 on OS X. I've run into a problem while making a rough .rpy prototype of a mapping application (ala MapQuest) using the U of Minnesota MapServer's Python interface. I will need to have server-side handlers for javascript events to allow map zooming, panning, &c and so have been experimenting with LivePage. I intend that the code should render a … [View More]map image, and upon clicking the image, we zoom into the map (changing model data), and redraw the map image. Unfortunately, browsers are unable to load the mapserv.rpy/?woven_hookupOutputConduitToThisFrame=1 URL that is generated by my instance of LivePage, and so the map is never redrawn as it should. The model data does get changed successfully, and when I manually reload the page, I do see the zoomed map image as I expect. What is this 'woven_hookupOutputConduitToThisFrame' all about? Do I need to set up another method to handle this URL? I know that it's not recommended to put so much logic in the .rpy file, but as I said, a quick and dirty prototype is what I'm after. Am attaching the source of mapserv.rpy here: -------------------------------------------------------------------- import os import time from twisted.web.woven import page, widgets, controller, model from mapscript import * base_mapfile = 'navtech_std.map' # Get map object from the session data if we can class MapModel(model.MethodModel): def wmfactory_mapobj(self, request): session_obj = request.getSession() try: session_mapobj = session_obj.mapobj except AttributeError: session_mapobj = mapObj(base_mapfile) session_obj.mapobj = session_mapobj return session_mapobj # Widget for creating a temp map image and a tag linking to it class MapImage(widgets.Widget): def setUp(self, request, node, data): mapobj = data node.tagName = "img" imgobj = mapobj.draw() tmp_file = '%s_%d_%d.%s' \ % (mapobj.name, time.time(), os.getpid(), imgobj.format.extension ) imgobj.save(os.path.join('/tmp', tmp_file)) map_url = os.path.join('/tmp', tmp_file) node.setAttribute('src', map_url) node.setAttribute('height', str(mapobj.height)) node.setAttribute('width', str(mapobj.width)) node.setAttribute('border', '1') # Widget for displaying the current scale of the map class MapScale(widgets.Widget): def setUp(self, request, node, data): text = 'Scale: 1:%d' % (data.scale) newNode = request.d.createTextNode(text) node.appendChild(newNode) # Template, using the web conduit glue template = """<html> <body> <img model="mapobj" view="map_image" controller="map_ctrl"/> <p model="mapobj" view="map_scale" /> <div view="webConduitGlue" /> </body> </html> """ # Zoom into the map in the event of a javascript onclick class MyEventHandler(controller.Controller): def handle(self, request): self.view.addEventHandler("onclick", self.onClick) def onClick(self, request, widget): # Get session map object (layers and spatial extents) session_obj = request.getSession() try: session_mapobj = session_obj.mapobj except AttributeError: session_mapobj = mapObj(base_mapfile) session_obj.mapobj = session_mapob # zoom in on the map w = session_mapobj.width h = session_mapobj.height pt = pointObj() pt.x, pt.y = w/2, h/2 session_mapobj.zoomPoint(2, pt, w, h, session_mapobj.extent, None) print session_mapobj.extent.minx, session_mapobj.extent.maxx print self, "Zoomed!!!" # There is a better way to redraw the map, certainly request.redirect('http://localhost:8084/mapserv.rpy/') request.finish() # Page class class MyPage(page.LivePage): def wcfactory_map_ctrl(self, request, node, model): return MyEventHandler(model) # Resource resource = MyPage(MapModel(), template=template) resource.setSubviewFactory("map_image", MapImage) resource.setSubviewFactory("map_scale", MapScale) ----------------------------------------------------------------------- looking forward to any insights into LivePage and also looking forward to getting enough experience with Twisted that I can begin to contribute to the list discussions. cheers, Sean -- Sean Gillies sgillies at frii dot com http://www.frii.com/~sgillies [View Less]

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[Twisted-Python] Another silly XML-RPC question
by Steve Freitas Aug. 26, 2003

Aug. 26, 2003

Hi all, This is maybe just a Python library question, but I'm not sure. I'd like to set up an XML-RPC server function to accept a dictionary/struct. So I thought I'd do this... def xmlrpc_foo(self, **mydict): But when I send it a struct, it throws an error of '0 args expected, 1 given,' much like... >>> def blah(**myDict): >>> return myDict['x'] >>> >>> print blah({'x':42, 'y':3}) ...does. So under regular Python, the way to make this work fine is: … [View More]

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