from:"Roger Haase"

Re: [Webware-discuss] Consolidating the infrastructure

2015-11-30 Thread Roger Haase

Agree, seems like many projects are moving to Github. And I add my thanks to 
you for maintaining the Webware project. 


On Saturday, November 28, 2015 1:14 PM, Chuck Esterbrook 
 wrote:
 

 Sounds good.

-Chuck

On Sat, Nov 28, 2015 at 11:09 AM, Steve Schwarz  wrote:

Hi Christoph,Sounds like a great idea. Thanks for maintaining this project!
Best Regards,
Steve
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On Sat, Nov 28, 2015 at 12:54 PM, Christoph Zwerschke  wrote:

Btw, is anyone against moving Webware to Github, consolidating all the
infrastructure (we still have our own server with web site, Wiki, SVN,
plus the SF page with mailing lists and discussion forums)? It makes no
sense that we have 3 mailing list plus various discussion forums on SF.

I also want to consolidate all of the docs and Wiki content, probably
using Sphinx, and then make it available on Readthedocs.

(Not immediately, but some time in winter, when I have time and it's
cold outside.)

-- Christoph





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Re: [Webware-discuss] Webware times out on WebFaction Hosting service

2011-07-26 Thread Roger Haase

- Original Message -
From: Christoph Zwerschke c...@online.de
To: Discussion of Webware for Python including feedback and proposals. 
webware-discuss@lists.sourceforge.net
Cc: 
Sent: Monday, July 25, 2011 12:51 PM
Subject: Re: [Webware-discuss] Webware times out on WebFaction Hosting service

Am 25.07.2011 21:11 schrieb Roger Haase:
 Thank you Christoph, the problem was indeed different Python
 versions.  All is working now.

 Regarding the docstring and adapter.address file, I think the least
 confusing route would be to fix the docstring and add Host and
 AdapterPort lines to the WSGIAdapter.config (etc) files.

Ok, thanks for the feefback, it's already fixed in the trunk now.

If you have any other issues with 1.1b1 let me know since I plan
to release 1.1 final this weekend.

-- Christoph

--
Sounds great.  As stated earlier, I have been running 1.1b1 for some time on 
Ubuntu 10.04, 11.04 and and my test system is on Windows 7.  

Thanks again for your help.

Roger Haase

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Re: [Webware-discuss] Webware times out on WebFaction Hosting service

2011-07-25 Thread Roger Haase

- Original Message -
From: Christoph Zwerschke c...@online.de
To: Discussion of Webware for Python including feedback and proposals. 
webware-discuss@lists.sourceforge.net
Cc: 
Sent: Sunday, July 24, 2011 11:08 PM
Subject: Re: [Webware-discuss] Webware times out on WebFaction Hosting service

Am 25.07.2011 00:36 schrieb Roger Haase:
 I have some progress. I think the WSGIAdapter.py has a bug -- I
 couldnot use a non-standard port on Ubuntu 11.04.

Just had a look and noticed that I actually removed the adapter.address 
file config option in r8114 on purpose, probably because you can do the 
same with WSGIAdapter.config. I just forgot to remove its mention in the 
docstring and had WSGIAdapter.config spelled wrong.

Not sure if I should remove it in the docstring now or reinclude the 
support for the adapter.address file. Do you think it's worthwile?

Note that I made some small fixes to the WSGIAdapter after 1.1b1, the 
current version is here:
http://svn.w4py.org/Webware/trunk/WebKit/Adapters/WSGIAdapter.py
But I don't think they have to do with your bad marshall data error.

Could you post a traceback of that error? I guess it's thrown somewhere 
in receiveDict. One possible problem could be that your WSGIAdapter.py 
file runs with a different Python version than your ThreadedAppServer.

-- Christoph

--

Thank you Christoph, the problem was indeed different Python versions.  All is 
working now.

Regarding the docstring and adapter.address file, I think the least confusing 
route would be to fix the docstring and add Host and AdapterPort lines to the 
WSGIAdapter.config (etc) files.

Thanks for your help!

Roger Haase

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Re: [Webware-discuss] Webware times out on WebFaction Hosting service

2011-07-24 Thread Roger Haase





- Original Message -
From: Roger Haase crosseyedpeng...@yahoo.com
To: Discussion of Webware for Python including feedback and proposals. 
webware-discuss@lists.sourceforge.net
Cc: 
Sent: Saturday, July 23, 2011 4:57 AM
Subject: Re: [Webware-discuss] Webware times out on WebFaction Hosting service





- Original Message -
From: Christoph Zwerschke c...@online.de
To: Discussion of Webware for Python including feedback and proposals. 
webware-discuss@lists.sourceforge.net
Cc: 
Sent: Saturday, July 23, 2011 2:20 AM
Subject: Re: [Webware-discuss] Webware times out on WebFaction Hosting service

Am 23.07.2011 07:05 schrieb Roger Haase:
 I have added a WebFaction Custom app (listening on port) to obtain
 a unique port number. Then I modified my wsgiadapter to point at
 184.172.207.73:41759 and modified the app serverconfiguration to
 listen at the same address.

Which Webware version are you using? Webware normally connects to Apache 
via mod_webkit; only the last beta supports mod_wsgi.

-- Christoph

--

I have been running Webware 1.1b1 with the mod_wsgi adapter since May, 2010 on 
Ubuntu 10.04 and Ubuntu 11.04.  The Python version is 2.7.1 on Webfaction.  

I will start over with a clean installation of Webware and give the mod_webkit 
adapter a try if the problems with wsgi continue.

Chuck and Christof, thanks for your thoughts.

Roger Haase

-
I have some progress.  I think the WSGIAdapter.py has a bug -- I could not use 
a non-standard port on Ubuntu 11.04.  I copied a few lines of code from 
CGIAdapter.py to read adapter.address and pass on the host and port.  My Patch:


diff -r 326014bd2b8f WebKit/Adapters/WSGIAdapter.py
--- a/WebKit/Adapters/WSGIAdapter.py    Sun Jul 24 14:37:54 2011 -0700
+++ b/WebKit/Adapters/WSGIAdapter.py    Sun Jul 24 14:52:42 2011 -0700
@@ -7,7 +7,7 @@
 This script expects to find a file in its directory called 
 'adapter.address' that specifies the address of the app server. 
 If the address file is not found, the address is taken from 
-the configuration file called 'WSGIAdapter.conf'. 
+the configuration file called 'WSGIAdapter.config'. 
  
 Contributed to Webware for Python by Christoph Zwerschke, 04/2010. 
  
@@ -55,6 +55,11 @@
 def __call__(self, environ, start_response): 
 The actual WSGI application. 
 err = StdErr(environ.get('wsgi.errors', None)) 
+    host, port = open(os.path.join(self._webKitDir, 
+    'adapter.address')).read().split(':', 1) 
+    if os.name == 'nt' and not host: 
+    host = 'localhost' # MS Windows doesn't like a blank host name 
+    port = int(port) 
 try: 
 inp = environ.get('wsgi.input', None) 
 if inp is not None: 
@@ -73,7 +78,7 @@
 environ = dict(item for item in environ.iteritems() 
 if isinstance(item[1], (bool, int, long, float, 
 str, unicode, tuple, list, set, frozenset, dict))) 
-    response = self.getChunksFromAppServer(environ, inp or '') 
+    response = self.getChunksFromAppServer(environ, inp or '', 
host=host, port=port) 
 header = [] 
 for chunk in response: 
 if header is None:


The above works for me on Ubuntu 11.04.  I am not sure if the additional code 
should be moved down within the try statement.  

I am still working on resolving the WebFaction problem.  With the patch 
applied, I now get bad marshall data errors.  This is my first experience 
with web hosts.  There are about 170 other users on my server and nginx is used 
to give each user their own apache conf file.  I suspect nginx has some kind of 
attachment to my custom port that is causing the problem, but am still 
looking.

Roger Haase





 if header is None:


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Re: [Webware-discuss] Webware times out on WebFaction Hosting service

2011-07-23 Thread Roger Haase

- Original Message -
From: Christoph Zwerschke c...@online.de
To: Discussion of Webware for Python including feedback and proposals. 
webware-discuss@lists.sourceforge.net
Cc: 
Sent: Saturday, July 23, 2011 2:20 AM
Subject: Re: [Webware-discuss] Webware times out on WebFaction Hosting service

Am 23.07.2011 07:05 schrieb Roger Haase:
 I have added a WebFaction Custom app (listening on port) to obtain
 a unique port number. Then I modified my wsgiadapter to point at
 184.172.207.73:41759 and modified the app serverconfiguration to
 listen at the same address.

Which Webware version are you using? Webware normally connects to Apache 
via mod_webkit; only the last beta supports mod_wsgi.

-- Christoph

--

I have been running Webware 1.1b1 with the mod_wsgi adapter since May, 2010 on 
Ubuntu 10.04 and Ubuntu 11.04.  The Python version is 2.7.1 on Webfaction.  

I will start over with a clean installation of Webware and give the mod_webkit 
adapter a try if the problems with wsgi continue.

Chuck and Christof, thanks for your thoughts.

Roger Haase

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[Webware-discuss] Webware times out on WebFaction Hosting service

2011-07-22 Thread Roger Haase

I am a new WebFaction user trying to port an old Webware 
WebKit application.

 I have added a WebFaction Custom app (listening on port) to obtain a unique 
port number.  Then I modified my wsgi 
adapter to point at 184.172.207.73:41759 and modified the app server 
configuration to listen at the same address.

The problem is that the wsgi adapter and app server are not making a connection 
and the browser always get a timed out error. I started the AppServer manually 
in a putty ssh terminal the the AppServer starts but shows no indication of 
receiving a request.  The AppServer startup messages include the line 
Listening for Adapter on 184.172.207.73:41759 and the address.adapter file is 
created with the same value.

My WSGIAdapter.config file includes:


NumRetries = 20
SecondsBetweenRetries = 3
Host = '184.172.207.73'
AdapterPort = 41759


Any ideas as to what I am doing wrong?

Roger Haase

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Re: [Webware-discuss] Adapters

2010-07-01 Thread Roger Haase

I am running the WSGI adapter with 1.1b1 on Ubuntu 10.04 and also using it on a 
W/7 test system.  Works well for me.

Roger Haase

--- On Wed, 6/30/10, Chuck Esterbrook chuck.esterbr...@gmail.com wrote:

 From: Chuck Esterbrook chuck.esterbr...@gmail.com
 Subject: [Webware-discuss] Adapters
 To: Discussion of Webware for Python including feedback and proposals. 
 webware-discuss@lists.sourceforge.net
 Date: Wednesday, June 30, 2010, 11:54 PM
 Hi,

 Which adapters are you guys using to connect Apache 2.x to
 your WebKit
 applications?

 Sound off, please.

 -Chuck

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[Webware-discuss] self.response().flush() on 1.1b1 with WSGI

2010-05-14 Thread Roger Haase

I use a call to self.response().flush() on a couple of long running 
transactions.  With the WSGI adapter on 1.1.b1 the transaction runs to 
completion, but nothing is transferred until the transaction completes.

I haven't tested this with other adapters.  Anyone else notice this?

Roger Haase


  

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Re: [Webware-discuss] MiddleKit Threading Error?

2008-11-10 Thread Roger Haase

--- On Tue, 11/4/08, Christoph Zwerschke [EMAIL PROTECTED] wrote:

 From: Christoph Zwerschke [EMAIL PROTECTED]
 Subject: Re: [Webware-discuss] MiddleKit Threading Error?
 To: Discussion of Webware for Python including feedback and proposals. 
 webware-discuss@lists.sourceforge.net
 Date: Tuesday, November 4, 2008, 12:13 PM
 Roger Haase schrieb:
  I had to revise your new MiddleObject.py to put the
 _mk_cacheLock = 
  threading.RLock() statement at the module level
 rather than in the 
  MiddleObject __init__ method. A new MiddleObject
 instance is being 
  created with each request so putting the lock inside
 the object
  instance does not force single-threading through the
 readStoreData method.

 Right. I've put the lock on the class level now in
 r7581, that should 
 work as well.

  The MiddleKit test suite does not run for me either.

  I will look over the 3 other 3 MiddleKit changes in
 the queue and
  update them for 1.0Rc1.  It will probably take me
 about 2 weeks to
  get around to the task.

 Thanks. Anybody else who wants to brush up MiddleKit a bit
 before 1.0?

 -- Christoph

I have downloaded the latest version of MiddleObject.py and verified that 
putting the lock on the class level works for me.  

Per your previous messages, it looks like you have already processed the 3 
other MiddleKit changes in the queue.

Thanks for all your help!

Roger Haase

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Re: [Webware-discuss] MiddleKit Threading Error?

2008-11-04 Thread Roger Haase

--- On Sun, 11/2/08, Christoph Zwerschke [EMAIL PROTECTED] wrote:

 From: Christoph Zwerschke [EMAIL PROTECTED]
 Subject: Re: [Webware-discuss] MiddleKit Threading Error?
 To: [EMAIL PROTECTED], Discussion of Webware for Python including feedback 
 and proposals. webware-discuss@lists.sourceforge.net
 Date: Sunday, November 2, 2008, 3:14 PM
 Roger Haase schrieb:
  My revised solution is to put the lock at the
 beginning and end of the method.

 I never used MiddleKit, so I don't know how to test
 this, but since it 
 looks reasonable I've checked this in anyway, and
 cleaned up 
 MiddleObject.py a bit. Can you check whether this works for
 you?

 http://svn.w4py.org/Webware/trunk/MiddleKit/Run/MiddleObject.py

 Btw, I was trying to run the MiddleKit test suite, but I
 get many 
 errors. For instance when running python Test.py
 MKDelete I get a 
 Lock wait timeout exceeded (this hasn't
 anything to do with the lock 
 in the patch, I get it also without your patch). Does the
 test suite run 
 for you? If yes, on what OS, Py and database (driver)
 version?

 Also, while we're at it, can you or somebody else have
 a look at the 
 following MiddleKit patches:
 http://sourceforge.net/tracker/?group_id=4866atid=304866

 There are a handful of other very old open issues here,
 mostly MiddleKit 
 or other stuff I don't use. If anybody wants to work on
 these:
 http://sourceforge.net/tracker/?group_id=4866atid=104866

 Ideally I'd like to have a running MiddleKit test suite
 and most of the 
 issues above solved before releasing 1.0.

 -- Christoph

I had to revise your new MiddleObject.py to put the
_mk_cacheLock   = threading.RLock()
statement at the module level rather than in the MiddleObject __init__ method.  
A new MiddleObject instance is being created with each request so putting the 
lock inside the object instance does not force single-threading through the 
readStoreData method.

While doing some more testing, I found that the problem is largely dependent 
upon Firefox 3.  I have a static web page with 12 images and graphs that are 
generated by individual calls to Webware/MiddleKit.  To run the test that 
creates the conditions for failure, I must restart the AppServer, clear the 
browser cache, and reload the page.

Firefox 3 almost always causes the failure, Safari for Windows and Google 
Chrome rarely cause the failure, and IE 7 and Opera 9 never cause the failure 
(so far).

The MiddleKit test suite does not run for me either.

I will look over the 3 other 3 MiddleKit changes in the queue and update them 
for 1.0Rc1.  It will probably take me about 2 weeks to get around to the task.

Roger Haase

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Re: [Webware-discuss] MiddleKit Threading Error?

2008-10-22 Thread Roger Haase

--- On Sun, 10/19/08, Roger Haase [EMAIL PROTECTED] wrote:

 From: Roger Haase [EMAIL PROTECTED]
 Subject: MiddleKit Threading Error?
 To: webware-discuss@lists.sourceforge.net
 Date: Sunday, October 19, 2008, 3:46 PM
 I last reported this problem back on May 22, 2004.  I am not
 sure what I have been doing different lately, but I have
 encountered the problem on both my test system and my
 production system this past month.  I have never been able
 to reproduce this problem at will.  The problem last went
 away with some 0.8x or 0.9x release but has now occurred on
 1.0RC1.

 I think the problem is caused by:
   1. a freshly started AppServer
   2. a flurry of incoming transactions all trying to access
 a MySQL
 table that has not been accessed before.

 I think I am hitting the problem because my application
 generates web pages with multiple embedded images that are
 served by the Webware application.  So accessing a web page
 may create a flurry of transactions, the first has to wait
 for a disk read, and the second transactions overruns it
 resulting in duplicate entries in the cache.

 The abend occurs in MiddleKit/Run/MiddleObject in
 readStoreData at line 92:
 assert len(cache) + 1 == len(row)

 Per the fancy traceback, cache is equal to:
 [unbound method Folder.setFileName, 
 unbound method Folder.setSurveyDate, 
 unbound method Folder.setLockUserId, 
 unbound method Folder.setPhotographer, 
 unbound method Folder.setComments, 
 unbound method Folder.setRootId, 
 unbound method Folder.setSiteId, 
 unbound method Folder.setNumberFiles, 
 unbound method Folder.setUpdatedBy, 
 unbound method Folder.setUpdateTime, 
-- the problem is here, the fields repeat
 unbound method Folder.setFileName, 
 unbound method Folder.setSurveyDate, 
 unbound method Folder.setLockUserId, 
 unbound method Folder.setPhotographer, 
 unbound method Folder.setComments, 
 unbound method Folder.setRootId, 
 unbound method Folder.setSiteId, 
 unbound method Folder.setNumberFiles, 
 unbound method Folder.setUpdatedBy, 
 unbound method Folder.setUpdateTime]

 And row is equal to:
 (96L, 
 'MonumentNashRuin_AR-03-09-02-08', 
 datetime.date(2007, 2, 6),
  2L, 
 'RH, GH', 
 '', 
 8L, 
 94L, 
 42L, 
 2L, 
 datetime.datetime(2007, 9, 18, 12, 44, 3))

 I think the solution is to insert a lock around the code
 that deals
 with loading the cache the first time a table is accessed.
 This is my diff from MiddleKit/Run/MiddleObject.py (probably
 hard to read because of the line wraps).

Well, the previous solution worked for the failing transaction, but then I hit 
another problem on a flurry of 5 transactions that were generating PNG images.  
The new problem occurred in the same area - MiddleKit/Run/MiddleObject.py 
method readStoreData on the line:
   assert 0, attempted to refresh changed object 

My revised solution is to put the lock at the beginning and end of the method.

--- C:\...\MiddleObject.py-revBASE.svn005.tmp.pyTue Oct 21 08:41:35 2008
+++ C:...\MiddleObject.py   Tue Oct 21 08:36:16 2008
@@ -5,6 +5,9 @@
 from MiddleKit.Core.ObjRefAttr import ObjRefAttr
 from MiddleKit.Core.ListAttr import ListAttr

+import thread # 2002-08-21 rdh
+_cacheLock = thread.allocate_lock() # 2002-08-21 rdh
+
 try: # for Python  2.2
object
 except NameError:
@@ -67,6 +70,7 @@
for the same object in order to refresh the attributes
from the persistent store.

+   _cacheLock.acquire() # 2008-10-20 rdh
if self._mk_store:
assert self._mk_store is store, 'Cannot refresh data 
from a different store.'
if self._mk_changed and not self._mk_initing:
@@ -114,6 +118,7 @@
self._mk_initing = 0
self._mk_inStore = 1
self._mk_changed = 0  # setting the values above will have 
caused this to be set; clear it now.
+   _cacheLock.release() # 2008-10-20 rdh
return self

Roger Haase

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[Webware-discuss] MiddleKit Threading Error?

2008-10-19 Thread Roger Haase

I last reported this problem back on May 22, 2004.  I am not sure what I have 
been doing different lately, but I have encountered the problem on both my test 
system and my production system this past month.  I have never been able to 
reproduce this problem at will.  The problem last went away with some 0.8x or 
0.9x release but has now occurred on 1.0RC1.

I think the problem is caused by:
  1. a freshly started AppServer
  2. a flurry of incoming transactions all trying to access a MySQL
table that has not been accessed before.

I think I am hitting the problem because my application generates web pages 
with multiple embedded images that are served by the Webware application.  So 
accessing a web page may create a flurry of transactions, the first has to wait 
for a disk read, and the second transactions overruns it resulting in duplicate 
entries in the cache.

The abend occurs in MiddleKit/Run/MiddleObject in readStoreData at line 92:
assert len(cache) + 1 == len(row)

Per the fancy traceback, cache is equal to:
[unbound method Folder.setFileName, 
unbound method Folder.setSurveyDate, 
unbound method Folder.setLockUserId, 
unbound method Folder.setPhotographer, 
unbound method Folder.setComments, 
unbound method Folder.setRootId, 
unbound method Folder.setSiteId, 
unbound method Folder.setNumberFiles, 
unbound method Folder.setUpdatedBy, 
unbound method Folder.setUpdateTime, 
   -- the problem is here, the fields repeat
unbound method Folder.setFileName, 
unbound method Folder.setSurveyDate, 
unbound method Folder.setLockUserId, 
unbound method Folder.setPhotographer, 
unbound method Folder.setComments, 
unbound method Folder.setRootId, 
unbound method Folder.setSiteId, 
unbound method Folder.setNumberFiles, 
unbound method Folder.setUpdatedBy, 
unbound method Folder.setUpdateTime]

And row is equal to:
(96L, 
'MonumentNashRuin_AR-03-09-02-08', 
datetime.date(2007, 2, 6),
 2L, 
'RH, GH', 
'', 
8L, 
94L, 
42L, 
2L, 
datetime.datetime(2007, 9, 18, 12, 44, 3))

I think the solution is to insert a lock around the code that deals
with loading the cache the first time a table is accessed. This is my diff from 
MiddleKit/Run/MiddleObject.py (probably hard to read because of the line wraps).

@@ -5,6 +5,9 @@
 from MiddleKit.Core.ObjRefAttr import ObjRefAttr
 from MiddleKit.Core.ListAttr import ListAttr
 
+import thread 
+_cacheLock = thread.allocate_lock() 
+
 try: # for Python  2.2
object
 except NameError:
@@ -78,6 +81,9 @@
if store.setting('UseBigIntObjRefColumns', False):
fullClassName = self.__class__.__module__ + '.' + 
self.__class__.__name__
cache = self._mk_setCache.setdefault(fullClassName, [])
+
+   if not cache: 
+   _cacheLock.acquire() 
if not cache:
allAttrs = self.klass().allDataAttrs()
# @@ 2000-10-29 ce: next line is major hack: 
hasSQLColumn()
@@ -88,6 +94,7 @@
setMethodName = 'set' + name[0].upper() 
+ name[1:]
setMethod = getattr(self.__class__, 
setMethodName, '_'+name)
cache.append(setMethod)
+   _cacheLock.release() 
 
assert len(cache) + 1 == len(row)
self._mk_initing = 1


Roger Haase


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Re: [Webware-discuss] Upgrade to Python 2.4, MiddleKit and DateTime confusion -- Found problem

2006-01-04 Thread Roger Haase

The DateTime issue was the result of my sloppy upgrade.  I failed to
copy over the new AppServer, Launch, etc. to my context directory.  

I have to resolve a few issues with mx.DateTime in my own code, but
Webware is now running with the MySQLD-python 1.2 version.

Roger Haase


--- Roger Haase [EMAIL PROTECTED] wrote:

 Hi,
 
 I am trying to upgrade a Fedora Core 3 installation to Fedora Core 4,
 converting from Python 2.3 to 2.4 and moving to Webware .9 as part of
 the process.  Fedora Core 3 has been running with the mx utilities
 and
 MySQL-python 0.9.2.
 
 I am getting an abend when trying to logon to my application:
   File /home/web/dra/Scripts/SitePage.py, line 257, in
 respondToPost
 [edit]
 self._respond(transaction)
   File ./WebKit/HTTPContent.py, line 105, in _respond [edit]
   File ./WebKit/Page.py, line 30, in defaultAction [edit]
   File /home/web/dra/Scripts/Logon.py, line 79, in writeHTML [edit]
 user,message = self.processFields(cookieKey)
   File /home/web/dra/Scripts/Logon.py, line 111, in processFields
 [edit]
 user = sqldb.fetchObjectsOfClass('User',clauses='where name=%s'
 %
 name)
   File ./MiddleKit/Run/SQLObjectStore.py, line 346, in
 fetchObjectsOfClass [edit]
   File ./MiddleKit/Run/MiddleObject.py, line 104, in readStoreData
 [edit]
   File /home/web/dra/db/GeneratedPy/GenUser.py, line 942, in
 setUpdateTime [edit]
 raise TypeError, 'expecting datetime type, but got value %r of
 type
 %r instead' % (value, type(value))
 TypeError: expecting datetime type, but got value
 datetime.datetime(2005, 12, 22, 10, 34, 53) of type type
 'datetime.datetime' instead
 
 If I understand this correctly, a User record is in the process of
 being moved into the Middlekit store, and it is expecting the old
 mx.DateTime type of type 'DateTime', but the MySQL-python module is
 passing the Python 2.3/2.4 type 'datetime.datetime'.
 
 An idea was to uninstall mx and see what happened next, but yum
 reported that MySQL-python 1.2 was dependent upon mx and would be
 uninstalled along with it.  
 
 Anyone have an idea of what to do to fix this?  
 
 Roger Haase
 
 
 
 
   
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Re: [Webware-discuss] Upgrade to Python 2.4, MiddleKit and DateTime confusion

2005-12-30 Thread Roger Haase

--- Chuck Esterbrook [EMAIL PROTECTED] wrote:

 On 12/29/05, Roger Haase [EMAIL PROTECTED] wrote:
  ...
 
  If I understand this correctly, a User record is in the process of
  being moved into the Middlekit store, and it is expecting the old
  mx.DateTime type of type 'DateTime', but the MySQL-python module
 is
  passing the Python 2.3/2.4 type 'datetime.datetime'.
 
  An idea was to uninstall mx and see what happened next, but yum
  reported that MySQL-python 1.2 was dependent upon mx and would be
  uninstalled along with it.
 
  Anyone have an idea of what to do to fix this?
 
 I maintain MiddleKit and I'll help you work through this. Did you
 regen your MK source code? If so and you still have the problem, can
 you send me your GenUser.py so I can look at it?

I have worked around the problem by uninstalling MySQL-python 1.2 and
installed the older MySQL-python 0.9.2.  Everything seems to work OK
with the older module.

I think the problem is incompatible defauts between MiddleKit and
MySQL-python 1.2.  Given the presence of both mx and Python 2.3+,
MySQL-python 1.2 is choosing to use the Python datetime module and
MiddleKit is using the mx DateTime.

I had regened the MK source code and I have attached the module.  The
relevant part is the setUpdateTime method at line 936 and the failure
is the type check at line 941.

Roger Haase




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GenUser.py
Thu Dec 29 12:52:17 2005
Generated by MiddleKit.
'''

# MK attribute caches for setFoo() methods
_emailAttr = None
_nameAttr = None
_firstNameAttr = None
_lastNameAttr = None
_passwordAttr = None
_changePasswordAttr = None
_changePreferencesAttr = None
_jobCodeAttr = None
_connectionAttr = None
_screenWidthAttr = None
_screenHeightAttr = None
_colorDepthAttr = None
_ipAddressAttr = None
_cookieAttr = None
_browserNameAttr = None
_jscriptVersionAttr = None
_tinyImageSizeAttr = None
_smallImageSizeAttr = None
_mediumImageSizeAttr = None
_largeImageSizeAttr = None
_jumboImageSizeAttr = None
_doubleImageSizeAttr = None
_limitImageSizeAttr = None
_imageQualityAttr = None
_maximumImagesPageAttr = None
_surveySequenceAttr = None
_wikiIdAttr = None
_screenWidthLimitAttr = None
_updatedByAttr = None
_updateTimeAttr = None
_lastLogonAttr = None

import types
from mx import DateTime


from MiddleKit.Run.MiddleObject import MiddleObject
from types import InstanceType, LongType
from MiddleKit.Run.SQLObjectStore import ObjRefError



class GenUser(MiddleObject):

	def __init__(self):
		MiddleObject.__init__(self)
		self._email = None
		self._name  = None
		self._firstName = None
		self._lastName  = None
		self._password  = None
		self._changePassword= None
		self._changePreferences = None
		self._jobCode   = None
		self._connection= None
		self._screenWidth   = None
		self._screenHeight  = None
		self._colorDepth= None
		self._ipAddress = None
		self._cookie= None
		self._browserName   = None
		self._jscriptVersion= None
		self._tinyImageSize = None
		self._smallImageSize= None
		self._mediumImageSize   = None
		self._largeImageSize= None
		self._jumboImageSize= None
		self._doubleImageSize   = None
		self._limitImageSize= None
		self._imageQuality  = None
		self._maximumImagesPage = None
		self._surveySequence= None
		self._wikiId= None
		self._screenWidthLimit  = None
		self._updatedBy = None
		self._updateTime= None
		self._lastLogon = None


	def email(self):
		return self._email

	def setEmail(self, value):
		if value is not None:
			if type(value) is not types.StringType:
raise TypeError, 'expecting string type, but got value %r of type %r instead' % (value, type(value))

		# set the attribute
		origValue = self._email
		self._email = value

		# MiddleKit machinery
		self._mk_changed = 1  # @@ original semantics, but I think this should be under if not self._mk_initing...
		if not self._mk_initing and self._mk_serialNum0 and value is not origValue:
			global _emailAttr
			if _emailAttr is None:
_emailAttr = self.klass().lookupAttr('email')
if not _emailAttr.shouldRegisterChanges():
	_emailAttr = 0
			if _emailAttr:
# Record that it has been changed
if self._mk_changedAttrs is None:
	self._mk_changedAttrs = {} # maps name to attribute
self._mk_changedAttrs['email'] = _emailAttr  # changedAttrs is a set
# Tell ObjectStore it happened
self._mk_store.objectChanged(self)

	def name(self):
		return self._name

	def setName(self, value):
		if value is not None:
			if type(value) is not types.StringType:
raise TypeError, 'expecting string type, but got value %r of type %r instead' % (value, type(value))

		# set the attribute
		origValue = self._name
		self._name = value

		# MiddleKit machinery
		self

[Webware-discuss] Upgrade to Python 2.4, MiddleKit and DateTime confusion

2005-12-29 Thread Roger Haase

Hi,

I am trying to upgrade a Fedora Core 3 installation to Fedora Core 4,
converting from Python 2.3 to 2.4 and moving to Webware .9 as part of
the process.  Fedora Core 3 has been running with the mx utilities and
MySQL-python 0.9.2.

I am getting an abend when trying to logon to my application:
  File /home/web/dra/Scripts/SitePage.py, line 257, in respondToPost
[edit]
self._respond(transaction)
  File ./WebKit/HTTPContent.py, line 105, in _respond [edit]
  File ./WebKit/Page.py, line 30, in defaultAction [edit]
  File /home/web/dra/Scripts/Logon.py, line 79, in writeHTML [edit]
user,message = self.processFields(cookieKey)
  File /home/web/dra/Scripts/Logon.py, line 111, in processFields
[edit]
user = sqldb.fetchObjectsOfClass('User',clauses='where name=%s' %
name)
  File ./MiddleKit/Run/SQLObjectStore.py, line 346, in
fetchObjectsOfClass [edit]
  File ./MiddleKit/Run/MiddleObject.py, line 104, in readStoreData
[edit]
  File /home/web/dra/db/GeneratedPy/GenUser.py, line 942, in
setUpdateTime [edit]
raise TypeError, 'expecting datetime type, but got value %r of type
%r instead' % (value, type(value))
TypeError: expecting datetime type, but got value
datetime.datetime(2005, 12, 22, 10, 34, 53) of type type
'datetime.datetime' instead

If I understand this correctly, a User record is in the process of
being moved into the Middlekit store, and it is expecting the old
mx.DateTime type of type 'DateTime', but the MySQL-python module is
passing the Python 2.3/2.4 type 'datetime.datetime'.

An idea was to uninstall mx and see what happened next, but yum
reported that MySQL-python 1.2 was dependent upon mx and would be
uninstalled along with it.  

Anyone have an idea of what to do to fix this?  

Roger Haase





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RE: [Webware-discuss] Printing from web application

2005-09-20 Thread Roger Haase



--- Geoffrey Talvola [EMAIL PROTECTED] wrote:

 You might try to produce a printer-friendly version of your HTML
 reports.
 You can use the CSS style page-break-before: always on a P tag to
 force
 page breaks where needed.  For instance, if your report consists of a
 large
 HTML table, you may determine through trial and error that you can
 comfortably fit 20 rows on one page.  Then split up the table into
 multiple
 tables with no more than 20 rows per table and insert p
 style=page-break-before: always in between each one.  This will
 require a
 bit of experimenting and tweaking with different browsers to get it
 right,
 and it may not always work 100% correctly, but it may be good enough
 depending on your use case.
  
 You can have a view version of the report in which all of the data
 is
 contained within one large table for online use, and provide a link
 to a
 printable version of the report in which you split up the tables to
 fit
 one per page, strip out navigation links, etc.
  
 The nice thing about this is that the HTML reports will probably be
 much
 nicer to use online than a PDF report would (does anyone actually
 like
 viewing reports online using a PDF viewer?).  They probably won't
 look as
 nice when printed though.
  
 I've used this method with some success -- it's not perfect but given
 the
 choice between nice-for-printing PDF reports that are a pain to use
 online,
 and acceptable-printing HTML reports that are a pleasure to use
 online, I
 prefer the second choice.
  
 - Geoff
 
 

If you are using Firefox (and maybe the latest Netscape and Mozilla),
there is support for the THEAD, TFOOTER, and TBODY tags.  Just by
wrapping the heading rows of a table in thead, Firefox will print the
heading rows on subsequent pages -- no need to use the
page-break-before method on large tables.  This, combined with liberal
use of dispay: none; under the media print section to eliminate the
printing of buttons and other things not relevant on a printed page
creates printed output close to perfect.

Firefox deserves another plug here; if you are not using Firefox to
develop your application's html, you are missing out on some great
tools.  There are several fantastic developer extensions (click
Extensions under the Firefox Tools menu).  I use the Web Developer,
HTML Validator, and View Formatted Source extensions every day.

Roger Haase



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[Webware-discuss] +1 Attaboy for Mark and Webware 0.9b1

2005-07-15 Thread Roger Haase

I downloaded the 0.9b1 release and installed it on my W/XP test machine
this morning. I looked over the release notes and have lightly tested
the release.

I only found a couple of nits:

1. The important release notes for WebUtils is rather sparse.

2. Unpacking the tarball with WinZip resulted in a new Webware
directory rather than the expected Webware-0.9b1. While this did not
effect me and I always rename the directory to Webware, it could
accidently overly someone's production copy if they are not careful.

Thanks for your work, Mark. This looks like a pretty solid beta.

Roger Haase




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Re: [Webware-discuss] WebKit not compiling

2005-02-23 Thread Roger Haase


--- Eduardo Elgueta [EMAIL PROTECTED] wrote:

 Hi All,
 
 Suddenly, webkit is not compiling class library files. When I run a 
 servlet that uses this object, it generates an exception pointing to
 a 
 comment line in the class file! All changes to the class library
 files 
 are ignored.
 

I have had instances where the formatted dump displays segments of an
old code version and points to the wrong line of code, but if I use the
failing line number and edit the module, the line number is correct and
will always point to the actual line of code that is failing in the
current module.

Usually I just ignore it and fix my code, but stopping and restarting
the AppServer (even though auto restart is on in my test system) always
corrects the problem in the next formatted dump.

Roger Haase

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Re: [Webware-discuss] MiddleKit broken or major design change in CVS head?

2004-08-26 Thread Roger Haase


--- Chuck Esterbrook [EMAIL PROTECTED] wrote:


 Not to worry. As the author of MiddleKit I also have older projects
 that I don't want broken (and don't feel like upgrading).
 Consequently, when I make changes like this, I always add an option
 to get the old behavior. In this case, the setting is:
 
 {
   'SQLSerialColumnName': '%(className)sId',
 }
 
 Which goes in Settings.config inside your Foo.mkmodel.
 
 Also you may need this one if you don't want object references split
 into 2 columns (class id and obj id):
   'UseBigIntObjRefColumns': 1,
 

Thanks Chuck, that works for me.

Roger Haase




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[Webware-discuss] MiddleKit broken or major design change in CVS head?

2004-08-24 Thread Roger Haase

The current CVS head for Middlekit now generates and expects the
serialNum field for all SQL tables to be called serialNum where
before the serialNum field for each table would be called tablename +
Id.

This breaks a lot of existing code as all SQL tables created with prior
versions will not work. 

Here is a excerpt from a new create.sql written by Generate.py from CVS
head:

...
create table User (
serialNum int not null primary key auto_increment,
deleteddatetime null,
firstName  varchar(15),
lastName   varchar(15),
password   varchar(63),
...


And an excerpt from a create.sql made with 8.1 Middlekit:

...
create table User (
userId  int not null primary key auto_increment,
deleteddatetime,
firstName  varchar(15),
lastName   varchar(15),
password   varchar(63),
...

Roger Haase



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[Webware-discuss] MiddleKit Threading Problem

2004-05-22 Thread Roger Haase

It has been almost two years, but I have once again hit an abend in
MiddleObject.py (line 75 in 8.1):
assert len(cache)+1==len(row)

On my last reported incident, I had been encountering this problem
every several months, and the suggestion was made to upgrade to 7.1.
That seemed to have fixed the problem until today.

I think the problem is caused by:
  1. a freshly atarted AppServer
  2. a flurry of incoming transactions all trying to access a MySQL
table that has not been accessed before.

Once the problem occurs, all attempts to access that same table
continue to fail until the AppServer is restarted.

On my latest abend, clicking the Complete button for the variable
cache in the fancy traceback yields the following. Note all the
methods are duplicated in this instance, thus, the assert failed.

Full representation:
[unbound method Folder.setFileName, 
unbound method Folder.setSurveyDate, 
unbound method Folder.setLockUserId, 
unbound method Folder.setPhotographer, 
unbound method Folder.setComments, 
unbound method Folder.setRootId, 
unbound method Folder.setSiteId, 
unbound method Folder.setNumberFiles, 
unbound method Folder.setUpdatedBy, 
unbound method Folder.setUpdateTime, 

unbound method Folder.setFileName, 
unbound method Folder.setSurveyDate, 
unbound method Folder.setLockUserId, 
unbound method Folder.setPhotographer, 
unbound method Folder.setComments, 
unbound method Folder.setRootId, 
unbound method Folder.setSiteId, 
unbound method Folder.setNumberFiles, 
unbound method Folder.setUpdatedBy, 
unbound method Folder.setUpdateTime]

I think the solution is to insert a lock around the code that deals
with loading the cache the first time a table is accessed. At the top
of the MiddleObject.py add:

import thread # 2002-08-21 rdh
_cacheLock = thread.allocate_lock() # 2002-08-21 rdh

Then modify the block starting at line 64 to insure only one thread
gets to load the cache at a time:

if not cache: # 2002-08-21 rdh
_cacheLock.acquire() # 2002-08-21 rdh
if not cache:
allAttrs = self.klass().allDataAttrs()
# @@ 2000-10-29 ce: next line is major hack:
hasSQLColumn()
attrs = [attr for attr in allAttrs if
attr.hasSQLColumn()]
attrNames = [attr.name() for attr in attrs]
assert len(attrNames)+1==len(row)  # +1 because row has
serialNumber
for name in attrNames:
setMethodName = 'set' + name[0].upper() + name[1:]
setMethod = getattr(self.__class__, setMethodName,
'_'+name)
cache.append(setMethod)
_cacheLock.release() # 2002-08-21 rdh

Roger Haase






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Re: [Webware-discuss] Choosing a wiki - MoinMoin option

2004-04-06 Thread Roger Haase

For those of you not familiar with the latest MoinMoin release, version
1.2.1 has been restructured and now runs under Twisted, FastCGI, and
ModPython. 

The Twisted specific code is pretty small. I have intentions of taking
a stab at trying to get MoinMoin to run under Webware, but I don't have
the time at the moment and my skills are pretty lightweight.

The M$ approach to this would be to adapt MoinMoin to Webware and then
layer Webware specific features on top of it. For my own Webware
application, I have been trying to integrate a wiki into the
application. While it presently works well (just running MoinMoin with
the old CGI interface), it would be very handy to have access to
Webware session variables when writing MoinMoin macros to insert data
into a wiki page.

Roger Haase


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Re: [Webware-discuss] Re: website: moving forward

2004-04-02 Thread Roger Haase

--- Shane McChesney [EMAIL PROTECTED] wrote:

  
  Any thoughts?  
 
 What about webware4python.org? It's also available in .com, .net,
 .ca,
 .info, .biz, .us ...
 

I would vote for the webware4python.org name if that is available
because that is close to the original name. The Webware / Python web
application toolkit seems like a lot to say in a logo, especially if
you want to say it in a fraction of an inch at the end of a page.
Webware / 4 Python would fit better in small places.

Just my opinion. 

Roger Haase


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[Webware-discuss] RE: [Moin-user] Webware?

2004-02-26 Thread Roger Haase

--- Nick Trout [EMAIL PROTECTED] wrote:
 
  Anyone looking at getting Moin 1.2 working under Webware?
  
  Roger Haase
 
 
 What would be the benefits of that?
 
 Nick


The benefits are likely restricted to a few.  In my case, I use
MoinMoin as an easy extension to my Webware application for
documentation and discussion pages. I have written Moin macros that
display images and data from my Webware application on Moin pages and
have links on my Webware pages that open new windows for displaying
definitions of choices, etc.

Current problems include two separate login mechanisms and some sloppy
security aspects that I need to mend. 

Moin has been restructured (in the 1.2 release) and now runs under
Twisted, ModPython and FastCGI (was formerly a simple CGI application).

If you are not already using Moin and Webware, you will probably not be
interested in getting Moin to run under Webware.

Roger Haase

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Re: [Webware-discuss] ./AppServer stop Fails

2003-07-17 Thread Roger Haase

The rc script is where?

Roger haase


--- Ian Bicking [EMAIL PROTECTED] wrote:
 The WebKit/webkit rc script doesn't have this problem, though you'll
 have to put the paths in yourself.  It's the best way to start the
 AppServer when you're not doing development.
 



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Re: [Webware-discuss] ./AppServer stop Fails

2003-07-17 Thread Roger Haase

Thanks, you helped me figure out the problem restarting after my kill
command. I killed the AppServer pid rather than the ThreadedAppServer
pid. 

Roger Haase


--- Gary Perez [EMAIL PROTECTED] wrote:
 I have the same problem on a daily basis. My method to restart the 
 AppServer is to check the appserverpid.txt file in the runtime 
 directory (not the Webware/WebKit) directory, and kill that PID.
 Then, 
 ./AppServer  to start again. I wrote a Python script that will 
 either read that PID file and kill it, or parse the output of ps
 aux 
 and kill the appropriate PIDs. I can give that to you if you want.
 You 
 can do it through WebKit, if desired, but should do so through the 
 OneShot.cgi adapter, in case you need to restart the server after
 it's 
 gone to lunch.
 
 This probably doesn't solve your problem, but I hope it helps a bit.
 -Gary


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Re: [Webware-discuss] ./AppServer stop Fails

2003-07-17 Thread Roger Haase

Oh, that WebKit/webkit...! Duh, thanks, looked like a typo. 

Roger Haase



--- Ian Bicking [EMAIL PROTECTED] wrote:
 In WebKit/webkit, just like I said ;)  (Quick now, who's on first)


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[Webware-discuss] ./AppServer stop Fails

2003-07-16 Thread Roger Haase

Hi,

I am practicing the installation and running of my Webware app on a
dedicated remote hosted linux server with ssh and WebMin access.

A starting assumption is the way to start the AppServer is to ssh in
and start it in the normal manner and then disconnect, leaving it
running. Per the docs, I should be able to start another ssh session
and issue a:
   ./AppServer stop

This fails in the stop function of AppServer.py trying to:

pidfile = os.path.join(os.path.dirname(__file__),appserverpid.txt)

...which points to the WebKit directory.

The problem seems to be the recordPID method of AppServer.py stored
the PID in the mycontext directory:

pidfile = open(os.path.join(self._serverSidePath,
appserverpid.txt),w)


I was testing with the 8.0 release; the CVS version of AppServer.py
seems to have some code changes but the directory mismatch appears to
persist. I think the mycontext directory is the right place for the PID
file to be stored, but the stop function (as I understand it) doesn't
have a way to find the mycontext directory (stop is called from the
main function in ThreadedAppServer.py).


Using the admin function to stop the AppServer is probably an easy
way around this, but I understand the recommendation is to disable the
admin functions for production sites. I tried the kill method as well,
but that doesn't seem to shut down cleanly and I was unable to restart
the AppServer without rebooting.

Any suggestions?

Roger Haase



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Re: [Webware-discuss] Zope vs Webware (Not Really)

2003-06-11 Thread Roger Haase


--- Chris Bruce [EMAIL PROTECTED] wrote:
 
 I am getting ready to build a large webbased application.  I am set
 on
 python (still wondering how to make installation easy) and am
 deciding
 between Zope and Webware.  I have developed many Zope applications,
 but new
 to Webware.  I am well aware that they are very different and they
 can't
 truly be compared.  But many things I have read about Webware always
 mention
 Non of the Headaches of Zope or something similar.  What is meant
 by this?


If it really is an I project and not a we project, I don't think
Zope has much to offer you. I tried a while back, but never managed to
do anything useful with Zope. To me, Zope seems only appropriate for a
large team of developers. The learning curve is pretty steep for one
person to climb without someone elses shoulders to stand on now and
then.

Roger Haase

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[Webware-discuss] HowTo Restart AppServer and Preserve Session Based Locks

2003-03-02 Thread Roger Haase

I currently use my SitePage module to hold a shared MiddleKit store and
a dictionary which I use as a lock holder for active users who are
editing a logical section of a MySQL database.

I would like to be able to restart the AppServer:
   - from a servlet as discussed in another thread recently
   - automatically by updating a module
   - from the console

How can I save and restore my dictionary lock holder under all of the
above instances? Or is there a better technique I could use (like a
MySQL table or file instead of a dictionary in SitePage)?

Using a file or table would be an easy fix, but I currently detect
timed out users by maintaining a last accessed time in the lock
dictionary and clearing timed out users whenever a new user tries to
obtain a lock. Maintaining the last access time would require rewriting
the file/table with each incoming transaction. Is there a better way to
detect and remove a timed out user?

Roger Haase

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Re: [Webware-discuss] New documentation: Application Development

2003-01-10 Thread Roger Haase

From the end of Ian's new doc on Application Development:

'''
A basic framework for your SitePage might be:

from WebKit.Page import Page

class SitePage(Page):

def respond(self, trans):
if self.securePage():
if not self.session().value('username', False):
self.respondLogIn()
return

def securePage(self):
Override this method in your servlets to return True if the
page should only be accessible to logged-in users -- by default
pages are publically viewable
return False

def respondLogin(self):  #@@ s/b respondLogIn
# Here we should deal with logging in...
pass

Obviously there are a lot of details to add in on your own which are
specific to your application and the security and user model you are
using.
'''

I have managed to create an application that deals with session logins
and session timeouts, but have often wondered about the proper way to
handle the process. Could you elaborate on the above a bit more?

Specifically, doesn't the method respond have to call its ancestor in
Page (HTTPServlet)?  What does the method respondLogIn do if it
discovers the session has timed out or this is the request for a login
page rather than an incoming CGI login form?  Why did you choose to
override the method respond rather than awake as in SecurePage.py in
the WebKit Examples?

A few lines of SecurePage have puzzled me as well, this from line 40:

# Get login id and immediately clear it from the session
loginid = session.value('loginid', None)
if loginid:
session.delValue('loginid')

...and these from line 58:

# Check if they can successfully log in.  The loginid 
must match
what was previously
# sent.
if request.field('loginid', 'nologin')==loginid and
self.loginUser(username, password):
# Successful login.
# Clear out the login parameters
request.delField('username')
request.delField('password')
request.delField('login')
request.delField('loginid')

I have never understood where session.value('loginid') is being set,
why it is being deleted if it exists, why the incoming id must match
the old value, and what is the benefit of doing request.delField(...).

Roger Haase


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Re: [Webware-discuss] MiddleKit references

2002-11-05 Thread Roger Haase


--- Chuck Esterbrook [EMAIL PROTECTED] wrote:
 I added your paper to:
   http://webware.sourceforge.net/Papers/

 
  http://www.opensky.ca/~jdhildeb/webware/
 

In Jason's paper and elsewhere in the MiddleKit docs there is some
advice on avoiding concurrency issues:

'''
Concurrency Issues

.
.
.

If it is likely that two users will attempt to manipulate the same
object, you may want to implement a locking mechanism to prevent
problems from occurring.
'''

During some stress testing a few days ago I found that if two servlets
are updating or inserting different records at the same time using a
single store, then a store.saveChanges() from either of the servlets
writes all updated records in the store to the database.

So for any updates, it is best to either use unique stores or put locks
around the update operations.  Not doing so may result in bad things
happening, the most noticeable in my tests was an abend in
ObjectStore.py when an assert caught a positive serial number in an
object which was about to be added to the database.

Roger

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Re: [Webware-discuss] MiddleKit references

2002-11-05 Thread Roger Haase


--- Jason Hildebrand [EMAIL PROTECTED] wrote:
 
 In any case, it would be a good first step to see if it solves your
 problem, Roger.  I can send you a patch, just let me know if you use
 the
 0.7 release or CVS.
 

I fixed the problem by putting a rather brutal lock in ObjectStore, but
I would be happy to try your patch and grap a fresh copy of CVS at the
same time.

I was wondering if a more elegant solution would be to make MiddleKit
inserts and deletes commit to the database immediately and offer an
update option along the lines of what Ian discussed a while back which
would also cause an immediate commit.  I am too lazy to find the
original, it was a syntax like:
   row.update(a=1,b=2,c=3...)

I am not sure of the performance issues of this, plus or minus, but it
would be easier to explain.

Roger


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Re: [Webware-discuss] MiddleKit references

2002-11-05 Thread Roger Haase

--- Michael Engelhart [EMAIL PROTECTED] wrote:
 Shouldn't these updates/inserts be wrapped in a database transaction 
 anyway?
 Wouldn't that avoid the threading issues that are coming up?
 
I have been wrong a lot on MiddleKit threading issues in particular,
but I think currently if a servlet is doing:
   obj.setA(1)
   obj.setB(2)
and some other servlet does a saveChanges between the setA and setB,
the obj is committed to the database with only the change to A.  A
little scary, but a future saveChanges will add the B change.  The only
way to prevent this currently is a lock on a shared store from before a
servlets first .setX until it issues a saveChanges.  

Without a lock for a shared store, two racing saveChanges can currently
grab the same list of changed objects from the store, and the loser
discovers that the row it is trying to insert has already been inserted
(a great example of the usefulness of assert).

If your database transaction has a lock for all updates to a shared
store you are OK (not just updates to the same object per the docs),
else Jason's suggested change should fix the problem.

Roger

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Re: [Webware-discuss] Documentation format

2002-10-30 Thread Roger Haase


--- Ian Bicking [EMAIL PROTECTED] wrote:
 The documentation format discussion kind of died down, but I'd like
 to
 do some documenting, and that's one of those fleeting motivations you
 really have to grab onto ;)  Anyway, after looking some at the XML
 produced by reST, I think the format doesn't imply any great lock-in.
 
 And I like writing it, so I'd like to use it.  But this effects all
 the
 developers who might write documentation, since one of the first
 things
 I want to do is rewrite the current WebKit documentation, expanding
 and
 checking for accuracy.  I'm not planning to do anything too exciting
 at
 this point (no doc strings or literate programming or new tools or
 anything), just trying to get the basic documentation in good shape.
 
 Shall I go forward or do we need more discussion about this?
 
   Ian
 
At the risk of making the documentation project even harder, it seems
to me the best place to create Webware documentation is in a TWiki-like
environment because mass participation would be so easy.  Having looked
over the reStructuredText specs a bit, I rather like it because it
seems pretty simple.

There has been talk now and then of a Webware based Wiki (a WikiKiti?
;).  How difficult/feasible it would be modify your Wikiware code to
utilize reStructuredText?

Roger

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Re: [Webware-discuss] MiddleKit Threading Problem - Stage 2

2002-07-22 Thread Roger Haase


Well, I have been wrong a lot lately...  My HTML page had 7 very similar

img src=ShowPix?pid=4tn=160

tags trying to display 7 images. The second image succeeded and the other 6 
failed.  If I had messed up the classes.csv file all seven images should have 
failed.  Also, restarting the AppServer made everything work again.

Could have been a memory error, but I doubt it.  I will try to figure out 
what would be useful values to print at that point and wait for the next 
occurance.

Roger


On Sunday 21 July 2002 08:36 pm, Jason Hildebrand wrote:
 Hi Roger,

 On Sat, 2002-07-20 at 15:45, Roger Haase wrote:
  I believe I have stumbled into another threading issue, one step further
  along than the problem of last week.  This time it looks like it is in
  MiddleKit to me.  The situation is the same, I have a web page that is
  trying

 What makes you think it is a threading problem?

  via my ShowPix servlet, only the second image displayed correctly, all
  the rest crashed with error messages similar to:
 
  http://www.users.qwest.net/~haaserd/MiddleKit/Error-ShowPix.html

 I took a look at this error and the corresponding assertion in the middle
 kit code, and it looks like the number of columns coming from the database
 doesn't match the number of attributes in the object being
 fetched/instantiated.  Could it be that you've changed your classes.csv
 file (by adding an attribute to some class) but forgotten to add the column
 in the database?

 peace,
 Jason



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Re: [Webware-discuss] MiddleKit/MySQL Threading Problem - Solved

2002-07-14 Thread Roger Haase


Thanks Geoff! 

I downloaded your fix and by putting in the print statement verified I was 
getting multiple copies of UnboundMethodError before the fix and only one 
after the fix.

If I understand the problem correctly, the className.methodName(self,...) 
form of call does a global lookup and the error message was saying it found 
an instance with the right name, but it was the wrong copy.  The 
self.methodName(...) form does a local lookup and avoided the multiple copy 
confusion.

Roger Haase


On Sunday 14 July 2002 10:08 am, Geoff Talvola wrote:
 I just checked in a fix to Webware CVS.  Give it a try.

 - Geoff

 On Sun, 2002-07-14 at 12:36, Geoff Talvola wrote:
  This isn't a Python problem -- it's a bug in Webware.
 
  If you put a print statement at the end of UnboundMethodError.py you'll
  find that the module actually gets imported multiple times.  This
  somehow causes a mismatch between the instances and the classes that
  triggers the error you're noticing.
 
  If you restart the appserver, then use your web browser to directly
  access the UnboundMethodError servlet, then go to UnboundMethod.html,
  the error goes away.  The images come up fine with no errors as long as
  the appserver stays running.
 
  What this leads me to believe is that there is a race condition in
  WebKit.  If there are multiple simultaneous requests for a servlet that
  hasn't yet been loaded, the module containing the servlet gets imported
  multiple times simultaneously, causing various errors.  This would
  persist through the lifetime of the appserver since it never throws away
  old servlet instances.  But if the first access for the servlet occurs
  in isolation, then the problem is avoided.
 
  I'll see if I can add some locking into ServletFactory to solve the
  problem.
 
  - Geoff
 



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