In general, retry is called when a ZODB Conflict Error has happened.
If I remember well, Zope will silently retry 3 times, and then actually
return an error page showing the Conflict Error.

Pascal

De : yacine chaouche <[EMAIL PROTECTED]>
Date : Tue, 23 Jan 2007 10:49:40 +0100
À : Gabriel Genellina <[EMAIL PROTECTED]>
Cc : <zope@zope.org>
Objet : Re: [Zope] Zope pretends to receive and send XMLRPC data, but strace
sees nothing ! (fwd)

Hello all,

>From times to times, apparently randomly, I have the following uncaught
exception in the console :

2007-01-23 10:41:07 ERROR ZServer uncaptured python exception, closing
channel <ZServer.HTTPServer.zhttp_channel connected 10.75.49.51:48177
<http://10.75.49.51:48177>  at 0x44562e6c channel#: 140 requests:>
(socket.error:(104, 'Connection reset by peer')
[/opt/python2.4.2/lib/python2.4/asynchat.py|initiate_send|219]
[/opt/aef/Zope- 2.9.0/lib/python/ZServer/medusa/http_server.py|send|417]
[/opt/python2.4.2/lib/python2.4/asyncore.py|send|332])

In addition, i have edited this file
:Zope-2.9.0/lib/python/ZPublisher/HTTPRequest.py as follows :
<code>
    def retry(self):
        print "retry called in HTTPRequest for the",self.retry_count,"time"
        self.retry_count=self.retry_count+1
        self.stdin.seek(0)
        r=self.__class__(stdin= self.stdin,
                         environ=self._orig_env,
                         response=self.response.retry()
                         )
        r.retry_count=self.retry_count
        return r
</code> 

I only added a single print line to see if this method was called. And
indeed, it is ! Does anyone knows when (in what circumstances) this method
could be called ???

<console trace>
ip: 10.75.49.155 <http://10.75.49.155>  requests counting of lines 11 to 21
ip: 10.75.49.51 <http://10.75.49.51>  requests counting of lines 11 to 21
sending results to 10.75.49.155 <http://10.75.49.155>
sending results to 10.75.49.51 <http://10.75.49.51>
retry called in HTTPRequest for the 0 time
ip: 10.75.49.51 <http://10.75.49.51>  requests counting of lines 11 to 21

</console trace>

Thanks. 

Y.Chaouche

2007/1/19, yacine chaouche <[EMAIL PROTECTED]>:
> It writes and reads objects in the session, maybe the probleme comes from here
> ? Here's a little sinppet :
> 
>     def toutCompter(self):
>         """
>     xmlrpc methode, called from a web borwser.
>         """
>         documentXML = ComptageXML()
>     #this reads and writes objects in the session
>         dicoLignes  = self._fabriquerDicoLignes()
>     #do things with dicoLignes
>         for inumLigneCourante in xrange(borneInf,borneSup) :
>             snumLigneCourante = str(inumLigneCourante)
>             ligne = dicoLignes[snumLigneCourante]["requete"]
>         #do things here
>             self._ajouterAuDico(snumLigneCourante,ligne,comptage,arbre)
> 
>         if ligne :
>             self._mettreEnSession(resultats)
>         
>         response = self.REQUEST.RESPONSE
>         response.setHeader("Content-Type","text/xml")
>         response.setHeader ("charset","utf-8")
>         chaineXML = documentXML.formatXML()
>         print "sending results to "+addresseIP
>         return chaineXML
> 
>     def _fabriquerDicoLignes(self):
>         formulaire = self.getForm()
>         dicoLignes = self.getSession(self,"dicoLignes") or {}
>         for key in formulaire.keys():
>         #do things...
>         self.setSession("dicoLignes", dicoLignes)
>         return dicoLignes
> 
>     def _fabriquerListeLignes(self):
>         dicoLignes = RacineAbstraite.getSession(self,"dicoLignes") or {}
>         listeNumeros = dicoLignes.keys()
>         listeNumeros.sort ( lambda x,y: cmp(int(x), int(y)) )
>         return [ dicoLignes[str(inumeroLigne)]["requete"] for inumeroLigne in
> \
>                 sorted( [int(snumeroLigne) for snumeroLigne in
> dicoLignes.keys()] ) ]
> 
>     def _ajouterAuDico(self,p_snumeroCle,p_ligne,p_comptage,p_arbre):
>         dicoLignes = RacineAbstraite.getSession(self,'dicoLignes') or {}
>         dicoLignes[p_snumeroCle]  =
> {'requete':p_ligne,'comptage':p_comptage,'arbre':p_arbre}
>         self.setSession('dicoLignes',dicoLignes)
> 
>     def _mettreEnSession(self,p_resultats):
>         """
>         Mettre en session les résultats d'un comptage.
>         """ 
>         
>         # Initialise de la SESSION
>         dicoResultatRecherche = {
>             'listeCriteres'     : [self._fabriquerListeLignes(),
> self.getForm('numeroLigne')],
>             'nombreEntreprises' : p_resultats[0][0],
>             'listeComptage'     : p_resultats,
>             'listeEntreprises'  : [],
>             }
>         #On conserve la requete et le resultat en session
>         self.setSession('resultatRecherche', p_dicoResultatRecherche.copy())
> 
> 
> When toutCompter is called by browser 1, then he will write and read, say, the
> dicoLignes object in the session.
> When toutCompter is called by browser 2 parallely, is it the same dicoLignes
> object that it tries to access or another one is created ? can there be
> conflicts somehow ?
> 
> Y.Chaouche
> 
> 2007/1/19, yacine chaouche < [EMAIL PROTECTED]
> <mailto:[EMAIL PROTECTED]> >:
>> I mean triple couples of lines of code.
>> 
>> 2007/1/19, yacine chaouche < [EMAIL PROTECTED]
>> <mailto:[EMAIL PROTECTED]> >:
>>> The toutCompter methode does a lot of thing and it would take a triple
>>> couples of lines to describe what it does all.
>>> Anyway, is there a way for me to detect ConflictErrors ? they don't appear
>>> on the console so i guess they are catched.
>>> 
>>> Y.Chaouche
>>> 
>>> 2007/1/19, Gabriel Genellina <[EMAIL PROTECTED]
>>> <mailto:[EMAIL PROTECTED]> >:
>>>> At Thursday 18/1/2007 16:30, Andreas Jung wrote:
>>>> 
>>>> 
>>>>> <zope trace to the console>
>>>>> ip: 10.75.49.155  <http://10.75.49.155>  requests counting of lines 1 to
>>>>> 11
>>>>> ip: 10.75.49.51 <http://10.75.49.51>  requests counting of lines 1 to 11
>>>>> sending results to 10.75.49.155 <http://10.75.49.155>
>>>>> sending results to 10.75.49.51 <http://10.75.49.51>
>>>>> ip: 10.75.49.51 <http://10.75.49.51>  requests counting of lines 1 to 11
>>>>> sending results to 10.75.49.51 <http://10.75.49.51>
>>>>> </zope trace>
>>>>> 
>>>>> 
>>>>> Zope says he got 2 requests form 10.75.49.51 <http://10.75.49.51>  and
>>>>> sent it the results 2
>>>>> times. Ok, let's check the tcpflow then for these supposed connections :
>>>>> [...]
>>>>> Allright, there is only ONE POST request. So zope didnt really got two
>>>>> requests. Now let's see if it sent the data two times as it presumes :
>>>>> [...]
>>>>> The results were sent just one time, not two.
>>>>> 
>>>>> What is going on here ?
>>>> 
>>>> What does the toutCompter method really does? Does it modify some
>>>> object state? That might provoke a ConflictError, forcing a
>>>> transaction abort and the request to be re-tried (up to three times,
>>>> silently, then it goes logged).
>>>> 
>>>> 
>>>> --
>>>> Gabriel Genellina
>>>> Softlab SRL
>>>> 
>>>> 
>>>> 
>>>> 
>>>> 
>>>> 
>>>> __________________________________________________
>>>> Preguntá. Respondé. Descubrí.
>>>> Todo lo que querías saber, y lo que ni imaginabas,
>>>> está en Yahoo! Respuestas (Beta).
>>>> ¡Probalo ya!
>>>> http://www.yahoo.com.ar/respuestas  <http://www.yahoo.com.ar/respuestas>
>>>> 
>>>> _______________________________________________
>>>> Zope maillist  -  Zope@zope.org
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>>> 
>> 
> 



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