[Zope] Zope pretends to receive and send XMLRPC data, but strace sees nothing ! (fwd)

[Andreas Jung]

Please keep the discussion on the list and don't try to address helpdesk
requests to individuals.

-aj

------------ Forwarded Message ------------
Date: 18. Januar 2007 19:05:28 +0100
From: yacine chaouche <yacinechaouche at gmail.com>
To: Andreas Jung <lists at zopyx.com>
Subject: Re: [Zope] Zope pretends to receive and send XMLRPC data, but 
strace sees nothing !

2007/1/18, Andreas Jung <lists at zopyx.com>:
>
>
>
> --On 18. Januar 2007 16:40:02 +0100 Patrick Gerken
> <do3ccqrv at googlemail.com> w>
> >
> > instead of strace try tcpdump, much more helpful:
> > tcpdump -i <INTERFACE> -s 0 -A HOST <HOST> AND PORT <PORT>
> > should show the reality
> >
>
> "tcpflow" is much nicer and show the HTTP traffic in a decoded way.
>
> -aj
>
>
Thank you Andreas for showing me this nice tool which is tcpflow.

Thanks to it, I am now sure that the probleme is coming from zope.


Would you take a look at this :
root at CAY:~/HTTPCONNECTIONS# tcpflow host 10.75.49.100 and port 8081
tcpflow[20104]: listening on eth0

The tcpflow is run on the 10.75.49.51 machine, the one that zope thinks it
sends two times the XMLRPC query.
10.75.49.100 is the server that runs zope.

Now i click on the button, on both browsers (remember they are on different
machines), invoking the method "toutCompter" via xmlhttprequest, and wait
for zope to complete the requests :

<zope trace to the console>
ip: 10.75.49.155 requests counting of lines 1 to 11
ip: 10.75.49.51 requests counting of lines 1 to 11
sending results to 10.75.49.155
sending results to 10.75.49.51
ip: 10.75.49.51 requests counting of lines 1 to 11
sending results to 10.75.49.51
</zope trace>


Zope says he got 2 requests form 10.75.49.51 and sent it the results 2
times. Ok, let's check the tcpflow then for these supposed connections :
root at CAY:~/HTTPCONNECTIONS# ls
total 8,0K
-rw-r--r-- 1 root root 873 2007-01-18 18:52
010.075.049.051.41131-010.075.049.100.08081
-rw-r--r-- 1 root root 607 2007-01-18 18:53
010.075.049.100.08081-010.075.049.051.41131

Allright, first file (machine to server):

root at CAY:~/HTTPCONNECTIONS# cat 010.075.049.051.41131-010.075.049.100.08081
POST /aef/rechercheMultiligne/toutCompter HTTP/1.1
Host: 10.75.49.100:8081
User-Agent: Mozilla/5.0 (X11; U; Linux i686; fr; rv:1.8.1) Gecko/20061010
Firefox/2.0
Accept: text/xml,application/xml,application/xhtml+xml,text/html;q=0.9
,text/plain;q=0.8,image/png,*/*;q=0.5
Accept-Language: fr,en-us;q=0.7,en;q=0.3
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-15,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Connection: keep-alive
Content-Type: application/x-www-form-urlencoded
Referer: http://10.75.49.100:8081/aef/rechercheMultiligne
Content-Length: 224
Cookie: _ZopeId="58653529A2r8NuahgXc"
Pragma: no-cache
Cache-Control: no-cache

requete_1=ape%2012*&requete_2=ape%2012*&requete_3=ape%2012*&requete_4=ape%2
012*&requete_5=ape%2012*&requete_6=ape%2012*&requete_7=ape%2012*&requete_8=
ape%2012*&requete_9=ape%2012*&requete_10=ape%2012*&borneInf=0&borneSup=
10&root at CAY:~/HTTPCONNECTIONS#


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 :

root at CAY:~/HTTPCONNECTIONS# cat 010.075.049.100.08081-010.075.049.051.41131
HTTP/1.1 200 OK
Server: Zope/(Zope 2.9.0-, python 2.4.2, linux2) ZServer/1.1
Date: Thu, 18 Jan 2007 17:51:42 GMT
Content-Length: 413
Charset: utf-8
Content-Type: text/xml; charset=utf-8

<?xml version="1.0" encoding="utf-8" ?><comptages><comptage
numLigne="1">3</comptage><comptage numLigne="2">3</comptage><comptage
numLigne="3">3</comptage><comptage numLigne="4">3</comptage><comptage
numLigne="5">3</comptage><comptage numLigne="6">3</comptage><comptage
numLigne="7">3</comptage><comptage numLigne="8">3</comptage><comptage
numLigne="9">3</comptage><comptage numLigne="10">3</comptage></comptages>
root at CAY:~/HTTPCONNECTIONS#

The results were sent just one time, not two.

What is going on here ?

Any comment would be really appreciated.

Thanks,
Y.Chaouche

---------- End Forwarded Message ----------



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