Mailman 3 September 2002 - Twisted

[Twisted-Python] real code examples
by dennis＠illusions.com 21 Sep '02

21 Sep '02

Anyone, is there a repository of widget code examples? I have so many questions and so little answers... -- --- Dennis Sacks dennis(a)illusions.com

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[Twisted-Python] Re: [Twisted-commits] Element should have hasChildNodes
by Glyph Lefkowitz 20 Sep '02

20 Sep '02

On Fri, 20 Sep 2002 10:36:47 -0500, moshez CVS <moshez(a)twistedmatrix.com> wrote: > Log message: > Element should have hasChildNodes Node already had hasChildNodes, which Element was inheriting, and it had a more correct return value. Why was this necessary? -- | <`'> | Glyph Lefkowitz: Traveling Sorcerer | | < _/ > | Lead Developer, the Twisted project | | < ___/ > | http://www.twistedmatrix.com |

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[Twisted-Python] epyrun failing
by Moshe Zadka 20 Sep '02

20 Sep '02

epyrun fails for me with: Traceback (most recent call last): File "./admin/epyrun", line 54, in ? cli() File "/usr/lib/python2.1/site-packages/epydoc/cli.py", line 202, in cli modules = _find_modules(param['modules'], param['verbosity']) File "/usr/lib/python2.1/site-packages/epydoc/cli.py", line 187, in _find_modules exec('module = %s' % name) File "<string>", line 1, in ? AttributeError: 'twisted.im' module has no attribute 'jychat' I want to thank the error for causing me to notice that epydoc has an unadorned exec (which is hardly necessary). This would, not, however, cause the error to go away -- AFAICS it is caused by jychat failing to import. A fix deep in the bowels of epydoc would be needed so AttributeError would merely cause a module to be skipped rather than the whole thing to come crumbling down.

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[Twisted-Python] Strange DOMTemplate error
by Alex Levy 20 Sep '02

20 Sep '02

I have been toying around with DOM Templates, practically using the example code off the web page (with a few minor changes), and I found something very strange. I received xml.sax._exceptions.SAXParseException whenever I placed the string '©' inside my template HTML. This, as it turns out, applied to just about any HTML special character. I tested it with ©   &foo; and a range of others. It also broke (although with a different error) whenever I tried using numeric character codes, like . Is this a 'feature', or some strange bug? Figured I'd mention it here. -- Alex Levy WWW: http://mesozoic.geecs.org Tel: 617.835.0778 "Never let your sense of morals prevent you from doing what is right." -- Salvor Hardin, Isaac Asimov's _Foundation_

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[Twisted-Python] jelly, marmalade, aot, and wacky types
by Andrew Bennetts 20 Sep '02

20 Sep '02

Quick question: Even if an object is of an unknown wacky type (say Zope's extension class), shouldn't jelly (and friends) check for callable(getattr(obj, '__getstate__, None)) anyway (i.e. treat it like an InstanceType and see what happens)? It looks like this is what pickle does. -Andrew.

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[Twisted-Python] twisted.web.woven.controller -- minor bugfix [PATCH]
by Jonathan Lange 20 Sep '02

20 Sep '02

G'day, A couple of minor bugs in controller, fixed in this patch. cheers, jml Index: controller.py =================================================================== RCS file: /cvs/Twisted/twisted/web/woven/controller.py,v retrieving revision 1.2 diff -u -r1.2 controller.py --- controller.py 23 Sep 2002 20:41:48 -0000 1.2 +++ controller.py 25 Sep 2002 11:00:51 -0000 @@ -19,8 +19,8 @@ from twisted.python import components from twisted.python import mvc from twisted.web import resource -from twisted.web.woven import view - +from twisted.web.woven import template +from twisted.python import log class WController(mvc.Controller, resource.Resource): """ @@ -45,7 +45,7 @@ def process(self, request, **kwargs): log.msg("Processing results: ", kwargs) - return view.RESTART_RENDERING + return template.RESTART_RENDERING def registerControllerForModel(controller, model):

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[Twisted-Python] DBReflector.loadObjectFrom question
by carball＠hush.com 19 Sep '02

19 Sep '02

greetings, using loadObjectsFrom, it seems the RowClass i am passing in should have dbColumns with data in it in order to build a correct sql query. . where does said data come from? my dbColumns is just an empty list also, i dont understand why i have to tell an instantiated DBReflector what tablename, keys, and RowClass to use again in loadObjectsFrom? i apologize if i'm missing something obvious i've read 'some' T.enterprise code, not enough to understand it all. . thanks in advance, cary --------------code----------------------------- #!/usr/bin/env python from twisted.enterprise import adbapi, row from twisted.internet import app class AcctRow( row.RowObject ): rowColumns = [ 'id', 't_id', 'name', 'label' ] dbKeyColumns = [( 'id', 'int4' )] def __repr__( self ): return '%d %s' % ( self.id, self.name ) def refInit( result ): print 'refInit', result dbpool = adbapi.ConnectionPool( 'pyPgSQL.PgSQL' ) reflector = row.DBReflector( dbpool, [( AcctRow, 'acct', AcctRow.dbKeyColumns )], refInit ) reflector.loadObjectsFrom( 'acct', AcctRow.dbKeyColumns, None, AcctRow ) application = app.Application('rowTest') application.run(save=0) --------------------------- this fails in DBReflector._objectLoader, dbColumns is []?????? i'm using twisted 0.99.0 -----------output------------------ car@platypus car $ ./rowTest.py Installing SelectReactor, since unspecified. Connecting to database: pyPgSQL.PgSQL ('',) {} Enabling Multithreading. adbapi connecting: pyPgSQL.PgSQL ('',) Exception in SQL interaction! rolling back... Traceback (most recent call last): File '/usr/lib/python2.2/site-packages/twisted/enterprise/adbapi.py', line 154 , in _runInteraction result = apply(interaction, (trans,)+args, kw) File '/usr/lib/python2.2/site-packages/twisted/enterprise/row.py', line 245, i n _objectLoader transaction.execute(sql) File '/usr/lib/python2.2/site-packages/pyPgSQL/PgSQL.py', line 2393, in execut e adbapi connecting: pyPgSQL.PgSQL ('',) raise OperationalError, msg libpq.OperationalError: ERROR: parser: parse error at or near 'FROM' Traceback (most recent call last): File '/usr/lib/python2.2/site-packages/twisted/internet/threads.py', line 33, in _putResultInDeferred result = apply(f, args, kwargs) File '/usr/lib/python2.2/site-packages/twisted/enterprise/adbapi.py', line 154 , in _runInteraction result = apply(interaction, (trans,)+args, kw) File '/usr/lib/python2.2/site-packages/twisted/enterprise/row.py', line 245, i n _objectLoader transaction.execute(sql) File '/usr/lib/python2.2/site-packages/pyPgSQL/PgSQL.py', line 2393, in execut e raise OperationalError, msg libpq.OperationalError: ERROR: parser: parse error at or near 'FROM' refInit None Main loop terminated. Get your free encrypted email at https://www.hushmail.com

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Re: [Twisted-Python] Is X.25 supported?
by Eric C. Newton 18 Sep '02

18 Sep '02

Oops ... that should read: "Twisted does _not_ prevent it..." Twisted is great. Eric is an idiot. Some more details for the internet to record for posterity: The X.25 interface under Linux is socket based. You can use your friends listen/connect/accept/send/recv with the underlying X.25 drivers. The X.25 API on Sun and IBM AIX is SysV Streams based, and you interact with the X.25 device with different system calls. As you know, twisted works great for sockets, and it _seems_ like it would be simple enough to do. But Python does not quite support the interface necessary to create real X.25 connections. With some simple C extensions you can expose the API. The main problem is that the format of a X.25 address is quite different from a TCP/IP address. Once you get a file descriptor, it can be integrated with the Reactor. My only problems with Twisted were trying to make the X.25 API as full-featured as a TCP/IP connection. With some effort, I'm sure it can be done. I've successfully used X.25 against the Linux loopback device, and on the real hardware under Solaris and AIX. I've done all three with Python. If you want any other help with this, please contact me off list. -Eric ecn(a)metaslash.com On Tue, Sep 17, 2002 at 02:20:42PM -0400, Eric C. Newton wrote: > Twisted does prevent it, but there is no built-in support. This is > not suprising since X.25 APIs are different on nearly every platform. > > I tried re-patching my changes back in recently and had little > success. I may come back to this in a couple of months. > > -Eric > > On Tue, Sep 17, 2002 at 06:51:26PM +0200, Sergio Lobo wrote: > > Hello, > > > > I just found the article below on the web. Would anybody please let me know if > > Twisted-Python provides any support for the X.25 protocol? > > > > Kind regards > > Sergio Lobo > > > > > > [Twisted-Python] adding a new connection type > > Eric C. Newton twisted-python(a)twistedmatrix.com > > Sun, 26 May 2002 22:30:45 -0400 > > > > * Previous message: [Twisted-Python] adding a new connection type > > * Next message: [Twisted-Python] adding a new connection type > > * Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] > > > > Itamar Shtull-Trauring <twisted(a)itamarst.org> writes: > > > Well, first of all, what does it run over? > > > > X.25. Be afraid. > > > > > And in what languages is it written? > > > > It runs in Python of course. > > > > > And, what is it good for? > > > > X.25 is an international standard for wide area communications widely > > adopted by companies in the 1970's and early 80's using > > packet-oriented, synchronous serial communications devices. > > > > I'm using Linux, and playing with 2-year-old patches for version 2.4 > > of the kernel which enables me to play with the API over a loopback > > device. > > > > Sometimes it even works. > > > > > > _______________________________________________ > > Twisted-Python mailing list > > Twisted-Python(a)twistedmatrix.com > > http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python > > _______________________________________________ > Twisted-Python mailing list > Twisted-Python(a)twistedmatrix.com > http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python

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[Twisted-Python] row.html howto XHTML compliance [PATCH]
by Jonathan Lange 18 Sep '02

18 Sep '02

G'day all, I noticed that admin/generate-domdocs failed on row.html, so I patched it to be a well-formed XHTML document (and to have lowercase tags ;) Patch below! Cheers, jml Index: doc/howto/row.html =================================================================== RCS file: /cvs/Twisted/doc/howto/row.html,v retrieving revision 1.9 diff -r1.9 row.html 1,5c1,9 < <HTML> < <HEAD> < <TITLE>Twisted Enterprise Row Objects</TITLE> < </HEAD> < <BODY> --- > <?xml version="1.0"?> > <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" > "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> > > <html xmlns="http://www.w3.org/1999/xhtml"> > <head> > <title>Twisted Enterprise Row Objects</title> > </head> > <body> 7c11 < <H1>Twisted Enterprise Row Objects</H1> --- > <h1>Twisted Enterprise Row Objects</h1> 9c13 < <P>The <CODE>twisted.enterprise.row</CODE> module is a method --- > <p>The <code>twisted.enterprise.row</code> module is a method 11c15 < tables. It has two components: the <CODE>RowObject</CODE> class --- > tables. It has two components: the <code>RowObject</code> class 13c17 < code interacts with, and the <CODE>DBReflector</CODE> which generates --- > code interacts with, and the <code>DBReflector</code> which generates 15c19 < deletes against the database.</P> --- > deletes against the database.</p> 17c21 < <P>The row module is intended for applications such as on-line --- > <p>The row module is intended for applications such as on-line 24c28 < to an existing python application.</P> --- > to an existing python application.</p> 26c30 < <P>Currently, the row module requires the use of PostgreSQL.</P> --- > <p>Currently, the row module requires the use of PostgreSQL.</p> 28c32 < <H2>Class Definitions</H2> --- > <h2>Class Definitions</h2> 30,31c34,35 < <P>To interface to relational database tables, the developer must < create a class derived from the <CODE>twisted.enterprise.row.RowObject</CODE> --- > <p>To interface to relational database tables, the developer must > create a class derived from the <code>twisted.enterprise.row.RowObject</code> 35c39 < are:</P> --- > are:</p> 37,42c41,46 < <UL> < <LI>rowColumns - list of the columns in the table with the correct < case < <LI>rowKeyColumns - list of key columns in form: [(columnName, < typeName)] < <LI>rowTableName - the name of the database table --- > <ul> > <li>rowColumns - list of the columns in the table with the correct > case</li> > <li>rowKeyColumns - list of key columns in form: [(columnName, > typeName)]</li> > <li>rowTableName - the name of the database table</li> 45c49 < <P>There are also two optional class attributes that can be specified:</P> --- > <p>There are also two optional class attributes that can be specified:</p> 47,48c51,52 < <UL> < <LI>rowForeignKeys - list of foreign keys to other database tables --- > <ul> > <li>rowForeignKeys - list of foreign keys to other database tables 50,53c54,57 < autoLoad] < <LI>rowFactoryMethod - a method that creates instances of this < class < </UL> --- > autoLoad]</li> > <li>rowFactoryMethod - a method that creates instances of this > class</li> > </ul> 55c59 < <P>For example:</P> --- > <p>For example:</p> 57c61 < <PRE> --- > <pre class="python"> 62c66,67 < rowFactoryMethod = [myRowFactory]</PRE> --- > rowFactoryMethod = [myRowFactory] > </pre> 64,65c69,70 < <P>The items in the rowColumns list will become data members of < classes of this type when they are created by the DBReflector.</P> --- > <p>The items in the rowColumns list will become data members of > classes of this type when they are created by the DBReflector.</p> 67c72 < <H2>Initialization</H2> --- > <h2>Initialization</h2> 69c74 < <P>The initialization phase builds the SQL for the database interactions. --- > <p>The initialization phase builds the SQL for the database interactions. 73c78 < are passed to the DBReflector when it is created.</P> --- > are passed to the DBReflector when it is created.</p> 75c80 < <P>An example class list for the RoomRow class we specified above:</P> --- > <p>An example class list for the RoomRow class we specified above:</p> 77c82 < <PRE> --- > <pre class="python"> 82c87,88 < reflector = row.DBReflector( dbpool, [RoomRow], runTests )</PRE> --- > reflector = row.DBReflector( dbpool, [RoomRow], runTests ) > </pre> 84c90 < <H2>Creating Row Objects</H2> --- > <h2>Creating Row Objects</h2> 86,87c92,93 < <P>There are two methods of creating RowObjects - loading from < the database, and creating a new instance ready to be inserted.</P> --- > <p>There are two methods of creating RowObjects - loading from > the database, and creating a new instance ready to be inserted.</p> 89c95 < <P>To load rows from the database and create RowObject instances --- > <p>To load rows from the database and create RowObject instances 94c100 < example:</P> --- > example:</p> 96c102 < <PRE> --- > <pre class="python"> 101c107,108 < refector.loadObjectsFrom("testrooms", whereClause=[("id", reflector.EQUAL, 5)]).addCallback(gotRooms)</PRE> --- > refector.loadObjectsFrom("testrooms", whereClause=[("id", reflector.EQUAL, 5)]).addCallback(gotRooms) > </pre> 103c110 < <P>For more advanced RowObject construction, loadObjectsFrom may --- > <p>For more advanced RowObject construction, loadObjectsFrom may 110c117 < before exposing the data to user code. An example factory method:</P> --- > before exposing the data to user code. An example factory method:</p> 112c119 < <PRE> --- > <pre class="python"> 116c123 < return newRoom</PRE> --- > return newRoom</pre> 118c125 < <P>The last method of creating a row object is for new instances --- > <p>The last method of creating a row object is for new instances 122c129 < method of the DBReflector. For example:</P> --- > method of the DBReflector. For example:</p> 124c131 < <PRE> --- > <pre class="python"> 134c141,142 < reflector.insertRow(newRoom).addCallback(onInsert)</PRE> --- > reflector.insertRow(newRoom).addCallback(onInsert) > </pre> 136c144 < <P>This will insert a new row into the database table for this --- > <p>This will insert a new row into the database table for this 141c149 < from being changed by mistake.</P> --- > from being changed by mistake.</p> 143d150 < <P> </P> 145c152 < <H2>Relationships Between Tables</H2> --- > <h2>Relationships Between Tables</h2> 147,154c154,162 < <P>Specifying a foreign key for a RowClass creates a relationship < between database tables. When <I>loadObjectsFrom</I> is called for a < table, it will automatically load all the children rows for the rows < from the specified table. The child rows will be put into a list < member variable of the rowObject instance with the name "childRows" or < if a <i>containerMethod</i> is specified for the foreign key < relationship, that method will be called on the parent row object for < each row that is being added to it as a child.</P> --- > <p>Specifying a foreign key for a RowClass creates a relationship > between database tables. When <code > class="python">loadObjectsFrom</code> is called for a table, it will > automatically load all the children rows for the rows from the specified > table. The child rows will be put into a list member variable of the > rowObject instance with the name "childRows" or if a > <i>containerMethod</i> is specified for the foreign key relationship, > that method will be called on the parent row object for each row that is > being added to it as a child.</p> 156c164 < <P>The <i>autoLoad</i> member of the foreign key definition is a flag --- > <p>The <i>autoLoad</i> member of the foreign key definition is a flag 158c166 < relationship when a parent row is loaded. --- > relationship when a parent row is loaded.</p> 160c168 < <H2>Duplicate Row Objects</H2> --- > <h2>Duplicate Row Objects</h2> 162c170 < <P>If a reflector tries to load an instance of a rowObject that --- > <p>If a reflector tries to load an instance of a rowObject that 166c174 < unique keys for this purpose.</P> --- > unique keys for this purpose.</p> 168c176 < <H2>Updating Row Objects</H2> --- > <h2>Updating Row Objects</h2> 170c178 < <P>RowObjects have a "dirty" member attribute that is --- > <p>RowObjects have a "dirty" member attribute that is 176c184 < (be sure to call the base class setDirty though!).</P> --- > (be sure to call the base class setDirty though!).</p> 178c186 < <P>When it is determined that a RowObject instance is dirty and --- > <p>When it is determined that a RowObject instance is dirty and 180c188 < to the "updateRow" method of the DBReflector. For example:</P> --- > to the "updateRow" method of the DBReflector. For example:</p> 182,183c190,192 < <PRE> < reflector.updateRow(room).addCallback(onUpdated)</PRE> --- > <pre class="python"> > reflector.updateRow(room).addCallback(onUpdated)\ > </pre> 185c194 < <P>For more complex behavior, the reflector can generate the SQL --- > <p>For more complex behavior, the reflector can generate the SQL 187c196 < for batching up multiple updates into single requests. For example:</P> --- > for batching up multiple updates into single requests. For example:</p> 189,190c198,200 < <PRE> < updateSQL = reflector.updateRowSQL(room)</PRE> --- > <pre class="python"> > updateSQL = reflector.updateRowSQL(room)\ > </pre> 192c202 < <H2>Deleting Row Objects</H2> --- > <h2>Deleting Row Objects</h2> 194c204 < <P>To delete a row from a database pass the RowObject instance --- > <p>To delete a row from a database pass the RowObject instance 196,197c206,207 < Deleting the python Rowobject instance does <EM>not</EM> automatically < delete the row from the database. For example:</P> --- > Deleting the python Rowobject instance does <em>not</em> automatically > delete the row from the database. For example:</p> 199,200c209,211 < <PRE> < reflector.deleteRow(room)</PRE> --- > <pre class="python"> > reflector.deleteRow(room) > </pre> 202,203c213,214 < </BODY> < </HTML> --- > </body> > </html>

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[Twisted-Python] newbie widget question
by dennis＠illusions.com 18 Sep '02

18 Sep '02

Hi, I've just started playing with Twisted 0.99.0. Bear with me please. I'd like to use widgets, but I do not understand how to 'hook' a widget into twisted web. The Example uses config.tac to specify main.Gadget() and 'twistd -g Example' to start the server. If I've got a web.tap, how do I use a widget? I see I can add a 'new web test widget' when using coil, but I don't know what this means. Any help would be greatly appreciated. -- --- Dennis Sacks dennis(a)illusions.com

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