[TransWarp] Infinite recursion computing a binded attribute

[Oleg Broytmann]

Hello! I've got a problem. Infinite recursion. I think I am doing something
wrong, but what?

   Let me briefly describe my hierarchy of classes:

class Component(binding.Component):
    appname = binding.bindTo("appname")
    appver = binding.bindTo("appver")
    log = binding.bindTo("log")


class Runnable(Component):
    protocols.advise(instancesProvide=[Interfaces.IRunnable])


class ThreadRunnable(Runnable):
   pass


class BaseHTTPD(Runnable):
    protocols.advise(instancesProvide=[interfaces.IUiFrontend])


class HtmlServer(ThreadRunnable):
    protocols.advise(instancesProvide=[interfaces.IUiServer])


class Application(binding.Component):
    protocols.advise(instancesProvide=[Interfaces.IRunnable])


   Components are loaded from config file:

[Provide Utilities]
ank.MedapE.interfaces.IUiFrontend = config.provideInstance('ank.MedapE.UiFrontEnd.BaseHTTPD.BaseHTTPD')
ank.MedapE.interfaces.IUiServer = config.provideInstance('ank.MedapE.UiServer.HtmlServer.HtmlServer')

[MedapE]
log = naming.lookup(targetObj, 'logfile:./MedapE.log?level=DEBUG')

components = "ui", "httpd"
component.ui = "ank.MedapE.UiServer.HtmlServer.HtmlServer"
component.httpd = "ank.MedapE.UiFrontend.BaseHTTPD.BaseHTTPD"


def run():
    _root = config.makeRoot(iniFiles=(("peak", "peak.ini"), "MedapE.cfg"))
    app = Application(parentComponent=_root)
    app.start()

   Boom!

STARTDIR=./ank/MedapE PEAK_CONFIG=`pwd`/MedapE.cfg PYTHONPATH=. python -t  ./ank/MedapE/app.py
error: uncaptured python exception, closing channel <ank.MedapE.UiFrontend.BaseHTTPD.BaseHTTPDServer listening localhost:8084 at 0x869a534> (exceptions.RuntimeError:maximum recursion depth exceeded 
[/usr/local/lib/python2.2/asyncore.py|poll3|183] 
[/usr/local/lib/python2.2/asyncore.py|handle_read_event|390] 
[BaseHTTPD.py|handle_accept|73] 
[BaseHTTPD.py|__init__|42] 
[/usr/local/lib/python2.2/SocketServer.py|__init__|514] 
[/usr/local/lib/python2.2/BaseHTTPServer.py|handle|266] 
[BaseHTTPD.py|process_request|47] 
[BaseHTTPD.py|process_request|161] 
[HtmlServer.py|handle|118] 

   There is just self.log.debug() in the line 118, but it seems peak cannot
compute self.log. Very strange, because in BaseHTTPD self.log was accessed
and used, no problems.

[C:\cygwin\home\pje\PEAK\src/peak/binding/_once.pyx|_once.OnceDescriptor.__get__|119] 
[C:\cygwin\home\pje\PEAK\src/peak/binding/_once.pyx|_once.__get__|106] 
[/usr/local/lib/python2.2/site-packages/peak/binding/components.py|computeValue|438] 
[/usr/local/lib/python2.2/site-packages/peak/binding/components.py|lookupComponent|319] 
[/usr/local/lib/python2.2/site-packages/peak/binding/components.py|lookup|399] 
[/usr/local/lib/python2.2/site-packages/peak/binding/components.py|lookup|258] 
[/usr/local/lib/python2.2/site-packages/peak/binding/components.py|acquireComponent|189] 
[/usr/local/lib/python2.2/site-packages/peak/config/config_components.py|nameNotFound|407] 
[/usr/local/lib/python2.2/site-packages/peak/naming/api.py|lookup|51] 
[/usr/local/lib/python2.2/site-packages/peak/naming/contexts.py|__getitem__|355] 
[/usr/local/lib/python2.2/site-packages/peak/naming/contexts.py|resolveToInterface|211] 
[/usr/local/lib/python2.2/site-packages/peak/naming/contexts.py|_resolveComposite|103] 
[/usr/local/lib/python2.2/site-packages/peak/naming/contexts.py|resolveToInterface|215] 
[/usr/local/lib/python2.2/site-packages/peak/naming/contexts.py|_resolveLocal|173] 
[/usr/local/lib/python2.2/site-packages/peak/naming/contexts.py|__getitem__|355] 
[/usr/local/lib/python2.2/site-packages/peak/naming/contexts.py|resolveToInterface|215] 
[/usr/local/lib/python2.2/site-packages/peak/naming/contexts.py|_resolveLocal|173] 
[/usr/local/lib/python2.2/site-packages/peak/naming/contexts.py|__getitem__|355] 

   Infinite recursion... Ouch!

Oleg.
-- 
     Oleg Broytmann            http://phd.pp.ru/            phd at phd.pp.ru
           Programmers don't die, they just GOSUB without RETURN.